Method and apparatus for controlling displacement of a variable volume pump or motor

Claim 2

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for opposing movement of said displacement changing means away from the position in which there is no flow through said device with a force which increases in direct proportion to the force applied to the displacement changing means by the inertia of the pistons of said device, said means for opposing movement of said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 3

The variable displacement device of claim 1 in which said means for opposing movement of said displacement changing means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion to the square of the rotational speed of the barrel.

Claim 4

The variable displacement device of claim 2 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 5

The variable displacement device of claim 3 in which said fixed displacement hydraulic pump also supplies fluid under pressure to said jet tube.

Claim 6

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotably movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, a jet discharge electrohydraulic valve including a pair of adjaCent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for opposing movement of said displacement changing means away from the position in which there is no flow through said device with a torque which increases in direct proportion to the torque applied to the displacement changing means by the inertia of the pistons of said device, said means for opposing movement of said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 7

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotably movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, a jet discharge electrohydraulic valve including a pair of adjaCent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for opposing movement of said displacement changing means away from the position in which there is no flow through said device with a torque which increases in direct proportion to the torque applied to the displacement changing means by the inertia of the pistons of said device, said means for opposing movement of said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 8

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for opposing movement of said displacement changing means away from the position in which there is no flow through said device with a force which increases in direct proportion to the movement of said displacement changing means away from the no flow position thereof and in direct proportion to the square of the rotational speed of the barrel.

Claim 9

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for opposing movement of said displacement changing means away from the position in which there is no flow through said device with a force which increases in direct proportion to the movement of said displacement changing means away from the no flow position thereof and in direct proportion to the square of the rotational speed of the barrel.

Claim 10

The variable displacement device of claim 6 in which said means for opposing movement of said displacement changing means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion to the square of the rotational speed of the barrel.

Claim 11

The variable displacement device of claim 7 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 12

The variable displacement device of claim 8 in which said fixed displacement hydraulic pump alsO supplies fluid under pressure to said jet tube.

Claim 13

A variable displacement hydraulic energy translating device having reciprocable fluid displacement elements mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, said device being characterized by having a force applied to the displacement changing means by piston inertia which tends to move said displacement changing means away from a position in which there is no flow through the device, which force increases in direct proportion to the square of the rotational speed of the pistons, and the improvement which comprises means for opposing movement of said displacement changing means away from a position in which there is no flow through the device with a force which increases in direct proportion to the force applied to the displacement changing means by the inertia of the displacement elements of said device, said means for opposing movement of said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said displacement elements upon changes of the rotational speed of said displacement elements independently of changes of position of said displacement changing means.

Claim 14

A variable displacement hydraulic energy translating device having reciprocable fluid displacement elements mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, said device being characterized by having a force applied to the displacement changing means by piston inertia which tends to move said displacement changing means away from a position in which there is no flow through the device, which force increases in direct proportion to the square of the rotational speed of the pistons, and the improvement which comprises means for opposing movement of said displacement changing means away from a position in which there is no flow through the device with a force which increases in direct proportion to the force applied to the displacement changing means by the inertia of the displacement elements of said device, said means for opposing movement of said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said displacement elements upon changes of the rotational speed of said displacement elements independently of changes of position of said displacement changing means.

Claim 15

The variable displacement device of claim 10 in which said means for opposing movement of said displacement changing means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said piston and cylinder elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion to the square of the rotational speed of the barrel.

Claim 16

The variable displacement device of claim 11 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 17

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, and the improvement which comprises means for opposing movement of said displacement changing means away from a position in which there is no flow through the device with a force which increases in direct proportion to the movement of said displacement changing means away from the no flow position thereof and in proportion to the square of the rotational speed of said barrel.

Claim 18

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, and the improvement which comprises means for opposing movement of said displacement changing means away from a position in which there is no flow through the device with a force which increases in direct proportion to the movement of said displacement changing means away from the no flow position thereof and in proportion to the square of the rotational speed of said barrel.

Claim 19

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotally movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, and the improvement which comprises means for opposing movement of said displacement changing means with a torque which increases in direct proportion to torque applied to the displacement changing means by the inertia of the pistons of said device, said means for opposing movement of said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 20

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotally movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, and the improvement which comprises means for opposing movement of said displacement changing means with a torque which increases in direct proportion to torque applied to the displacement changing means by the inertia of the pistons of said device, said means for opposing movement of said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 21

The variable displacement device of claim 14 in which saId means for opposing movement of said displacement changing means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion to the square of the rotational speed of the barrel.

Claim 22

The variable displacement device of claim 15 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 23

The variable displacement device of claim 14 in which said torque applying means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion to the square of the rotational speed of the barrel.

Claim 24

The variable displacement device of claim 17 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 25

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for applying a force to said displacement changing means opposed to and in proportion to the force applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to oppose increased displacement movement of said displacement changing means with a force which remains directly proportional to the square of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 26

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for applying a force to said displacement changing means opposed to and in proportion to the force applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to oppose increased displacement movement of said displacement changing means with a force which remains directly proportional to the square of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 27

The variable displacement device of claim 19 in which said force applying means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion tO the square of the rotational speed of the barrel.

Claim 28

The variable displacement device of claim 20 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 29

The variable displacement device of claim 21 in which said fixed displacement hydraulic pump also supplies fluid under pressure to said jet tube.

Claim 30

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotably movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for applying a torque to said displacement changing means opposed to and in proportion to the torque applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to oppose increased displacement movement of said displacement changing means with a force which remains directly proportional to the square of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 31

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotably movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for applying a torque to said displacement changing means opposed to and in proportion to the torque applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to oppose increased displacement movement of said displacement changing means with a force which remains directly proportional to the square of the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 32

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for applying a force to said displacement changing means opposed to and in proportion to the Movement of said displacement changing means away from the no flow position thereof and in direct proportion to the square of the rotational speed of the barrel.

Claim 33

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, a jet discharge electrohydraulic valve including a pair of adjacent receptor ports, an armature operated by a torque motor, a jet tube having a nozzle at one end thereof and fixedly mounted at a point separate from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports so as to effect movement of said fluid motor means in response to movement of said jet tube, feedback means connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a centered position between said receptor ports as said displacement means is moved away from a position in which there is no flow through the device, and the improvement which comprises means for applying a force to said displacement changing means opposed to and in proportion to the Movement of said displacement changing means away from the no flow position thereof and in direct proportion to the square of the rotational speed of the barrel.

Claim 34

The variable displacement device of claim 24 in which said force applying means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion to the square of the rotational speed of the barrel.

Claim 35

The variable displacement device of claim 25 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 36

The variable displacement device of claim 26 in which said fixed displacement hydraulic pump also supplies fluid under pressure to said jet tube.

Claim 37

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, said device being characterized by having a force applied to the displacement changing means by piston inertia which tends to move said displacement changing means away from a position in which there is no flow through the device, which force increases in direct proportion to the square of the rotational speed of the pistons, and the improvement which comprises means for applying a force to said displacement changing means opposed to and in proportion to the force applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes in the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 38

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and a movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, said device being characterized by having a force applied to the displacement changing means by piston inertia which tends to move said displacement changing means away from a position in which there is no flow through the device, which force increases in direct proportion to the square of the rotational speed of the pistons, and the improvement which comprises means for applying a force to said displacement changing means opposed to and in proportion to the force applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes in the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 39

The variable displacement device of claim 28 in which said force applying means includes a hydraulic motor having a hydraulic piston element and a hydraulic cylinder element, one of said elements being movable and the other being fixed relative to said displacement changing means, and means for supplying fluid under pressure to said motor at a pressure which increases in direct proportion to the square of the rotational speed of the barrel.

Claim 40

The variable displacement device of claim 29 in which said means for supplying fluid to said motor includes a fixed displacement hydraulic pump operatively connected to said barrel of said device so as to supply fluid therefrom at a flow rate directly proportional to the rotational speed of said motor.

Claim 41

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotally movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, and the improvement which comprises means for applying a torque to said displacement changing means which opposes and is in proportion to torque applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes in the rotAtional speed of said pistons independently of changes of position of said displacement changing means.

Claim 42

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotally movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, and the improvement which comprises means for applying a torque to said displacement changing means which opposes and is in proportion to torque applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes in the rotAtional speed of said pistons independently of changes of position of said displacement changing means.

Claim 43

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotally movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, and the improvement which comprises means for applying a torque to said displacement changing means which opposes and is generally equal to the torque applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes in the rotational speed of said pistons independently of changes of position of said displacement changing means.

Claim 44

A variable displacement hydraulic energy translating device having reciprocable pistons mounted in a rotatable barrel and an angularly and pivotally movable displacement changing means and including fluid motor means for pivotally moving and positioning said displacement changing means, said device being characterized by having a torque applied to the displacement changing means by piston inertia which tends to increase angulation of the displacement changing means, which torque increases in direct proportion to the angulation of the displacement changing means and the square of the rotational speed of the pistons, and the improvement which comprises means for applying a torque to said displacement changing means which opposes and is generally equal to the torque applied to the displacement changing means by the inertia of the pistons of said device, said means for applying a force to said displacement changing means being operable to maintain said force proportional to the force applied by the inertia of said pistons upon changes in the rotational speed of said pistons independently of changes of position of said displacement changing means.