EP0186500A1 — Static hydraulic pressure type continuously varia…

Claim 1

Independent Claim 164 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, comprising a pump cylinder of said hydraulic pump and a motor cylinder of said hydraulic motor which are integrally connected to each other in a coaxial manner with said hydraulic closed circuit being formed between both the cylinders; a first shaft integrally projected from an outer end surface of said pump cylinder and rotatably supported on a casing; an input member mounted on said first shaft relatively rotatably and axially immovably, a pump swashplate of said hydraulic pump being mounted on said input member; a second shaft rotatably supported on said casing coaxially with said first shaft, said second shaft being integrally projected from an outer end surface of said motor cylinder; and a non- rotatable swashplate anchor mounted on said second shaft axially immovably, said hydraulic motor having a motor swashplate tiltably supported on said swashplate anchor.

Claim 2

Dependent Claim 164 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, comprising a pump cylinder of said hydraulic pump and a motor cylinder of said hydraulic motor which are integrally connected to each other in a coaxial manner with said hydraulic closed circuit being formed between both the cylinders; a first shaft integrally projected from an outer end surface of said pump cylinder and rotatably supported on a casing; an input member mounted on said first shaft relatively rotatably and axially immovably, a pump swashplate of said hydraulic pump being mounted on said input member; a second shaft rotatably supported on said casing coaxially with said first shaft, said second shaft being integrally projected from an outer end surface of said motor cylinder; and a non- rotatable swashplate anchor mounted on said second shaft axially immovably, said hydraulic motor having a motor swashplate tiltably supported on said swashplate anchor.

Claim 3

Dependent Claim 14 words

The transmission according to claim 1, wherein said second shaft is an output shaft.

Claim 4

Dependent Claim 45 words

3 . The transmission according to claim 1 or 2, wherein a support sleeve is provided on an outer end of said second shaft axially immovably and unrotatably relative to the shaft, and said swashplate anchor is supported on said support tube through a bearing.

Claim 5

Dependent Claim 23 words

The transmission according to any of claims 1 to 3, wherein an output member is mounted on said second shaft for integral rotation.

Claim 6

Dependent Claim 25 words

5 , The transmission according to any preceding claim, wherein said hydraulic closed circuit is integrally provided between said pump cylinder and said motor cylinder.

Claim 7

Dependent Claim 27 words

The transmission according to claim 5, wherein said pump cylinder is fitted around an outer peripheral surface of said first shaft and held in place axially immovably.

Claim 8

Dependent Claim 105 words

The transmission according to claim 5 or 6, wherein said hydraulic closed circuit comprises a number of cylinder bores annularly arranged in said pump cylinder, a number of cylinder bores annularly arranged in said motor cylinder, an annular high pressure oil passage interposed between the pump cylinder bores and the motor cylinder bores to communicate with all the pump cylinder bores through a discharge valve, and an annular low pressure oil passage interposed between said pump cylinder bores and said motor cylinder bores to communicate with all the pump cylinder bores through an intake valve, said low and high pressure oil passages being disposed concentrically.

Claim 9

Dependent Claim 120 words

The transmission according to claim 5 or 6, wherein said hydraulic closed circuit comprises a number of cylinder bores annularly arranged in said pump cylinder, a number of cylinder bores annularly arranged in said motor cylinder, a high pressure oil passage interposed between the pump cylinder bores and the motor cylinder bores to communicate with all the pump cylinder bores through a discharge valve, a low pressure oil passage which communicates with the pump cylinder bores through an intake valve, and a distribution valve for bringing the motor cylinder bores into alternate communication with said low and high pressure oil passages, said distribution valve being provided so as to be rotatable integrally with said motor cylinder and said pump cylinder.

Claim 10

Dependent Claim 22 words

The transmission according to claim 8, wherein said distribution valve is slidably fitted in a valve hole formed in said motor cylinder.

Claim 11

Dependent Claim 19 words

The transmission according to any preceding claim, wherein said swashplate type hydraulic pump is of a constant capacity type.

Claim 12

Dependent Claim 22 words

The transmission according to any of claims 1 to 9, wherein said swashplate type hydraulic motor is of a variable capacity type.-

Claim 13

Dependent Claim 246 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, comprising an output shaft; a pump cylinder of said hydraulic pump and a motor cylinder of said hydraulic motor which are integrally connected to said output shaft; a number of cylinder bores annularly arranged in said pump cylinder; a number of cylinder bores annularly arranged in said motor cylinder; an annular high pressure oil passage communicated with all the cylinder bores of said pump cylinder through a discharge valve, an annular low pressure oil passage communicated with said cylinder bores of the pump cylinders through an intake valve, said high and low oil passages being formed concentrically with each other between said pump cylinder bores and said motor cylinder bores; and a distribution valve adapted to reciprocate between . a radial outward position and a radial inward position to bring said number of cylinder bores of said motor cylinder into alternate communication with said high and low oil passages, said distribution valve being associated with an eccentric actuating device to impart reciprocating motion to said distribution valve in response to rotation of said pump cylinder and said motor cylinder and being operated such that each of said cylinder bores of said motor cylinder is brought into communication with said high pressure oil passage in expansion stroke and is brought into communication with said low pressure oil passage in contraction stroke.

Claim 14

Dependent Claim 246 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, comprising an output shaft; a pump cylinder of said hydraulic pump and a motor cylinder of said hydraulic motor which are integrally connected to said output shaft; a number of cylinder bores annularly arranged in said pump cylinder; a number of cylinder bores annularly arranged in said motor cylinder; an annular high pressure oil passage communicated with all the cylinder bores of said pump cylinder through a discharge valve, an annular low pressure oil passage communicated with said cylinder bores of the pump cylinders through an intake valve, said high and low oil passages being formed concentrically with each other between said pump cylinder bores and said motor cylinder bores; and a distribution valve adapted to reciprocate between . a radial outward position and a radial inward position to bring said number of cylinder bores of said motor cylinder into alternate communication with said high and low oil passages, said distribution valve being associated with an eccentric actuating device to impart reciprocating motion to said distribution valve in response to rotation of said pump cylinder and said motor cylinder and being operated such that each of said cylinder bores of said motor cylinder is brought into communication with said high pressure oil passage in expansion stroke and is brought into communication with said low pressure oil passage in contraction stroke.

Claim 15

Dependent Claim 16 words

The transmission according to claim 12, wherein a plurality of said distribution valves are radially provided.

Claim 16

Dependent Claim 26 words

. The transmission according to claim 13, wherein the number of said distribution valves provided corresponds to that of said cylinder bores of said motor cylinder.

Claim 17

Dependent Claim 38 words

The transmission according to any of claims 12 to 14, wherein said eccentric actuating device comprises an eccentric ring having a center located at a position eccentric with respect to an axis of rotation of said motor cylinder.

Claim 18

Dependent Claim 15 words

The transmission according to claim 15, wherein said eccentric ring is supported on said casing.

Claim 19

Dependent Claim 26 words

The transmission according to claim 15 or 16, wherein said eccentric ring is composed of an inner race of a ball bearing secured to said casing.

Claim 20

Dependent Claim 45 words

The transmission according to any of claims 12 to 17, wherein said distribution valve brings said low pressure oil passage into communication with a replenishing oil passage when said low pressure oil passage is cut off communication with said cylinder bores of said motor cylinder.

Claim 21

Dependent Claim 22 words

The transmission according to any of claims 12 to 18, wherein said swashplate type hydraulic pump is of a constant capacity type.

Claim 22

Dependent Claim 22 words

The transmission according to any of claims 12 to 18, wherein said swashplate type hydraulic motor is of a variable capacity type.

Claim 23

Dependent Claim 110 words

A statis hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a variable capacity and swashplate type hydraulic motor, said hydraulic motor including a motor cylinder, a motor swashplate, and a tiltable swashplate holder for supporting a- back surface of said motor swashplate, said motor cylinder being integrally connected with an output shaft which extends through said motor swashplate and said swashplate holder, a swashplate anchor for supporting a back surface of said swashplate holder being supported axiallly immovably on said output shaft through a thrust bearing and being unrotatably connected to a casing which rotatably supports said output shaft.

Claim 24

Dependent Claim 110 words

A statis hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a variable capacity and swashplate type hydraulic motor, said hydraulic motor including a motor cylinder, a motor swashplate, and a tiltable swashplate holder for supporting a- back surface of said motor swashplate, said motor cylinder being integrally connected with an output shaft which extends through said motor swashplate and said swashplate holder, a swashplate anchor for supporting a back surface of said swashplate holder being supported axiallly immovably on said output shaft through a thrust bearing and being unrotatably connected to a casing which rotatably supports said output shaft.

Claim 25

Dependent Claim 46 words

22 . The transmission according to claim 21, wherein a support sleeve is integrally mounted on said output shaft against axial movement, said swashplate anchor being supported on said support sleeve through said thrust bearing, said support sleeve being supported on said casing through a bearing.

Claim 26

Dependent Claim 20 words

The transmission according to claim 21 or 22, wherein said swashplate type hydraulic pump is of a constant capacity type.

Claim 27

Dependent Claim 127 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, comprising an annular low pressure oil passage and an annular high pressure oil passage, said annular low and high pressure oil passages being concentrically formed with each other at a position adjacent a group of cylinder bores arranged annularly in a punp cylinder of said hydraulic pump, said low and high pressure oil passages being communicated with said cylinder bores through an intake valve and a discharge valve, respectively, a radially extending valve port being provided to receive a clutch valve which is capable of opening and closing said valve port for communication between said low and high pressure oil passages.

Claim 28

Dependent Claim 127 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, comprising an annular low pressure oil passage and an annular high pressure oil passage, said annular low and high pressure oil passages being concentrically formed with each other at a position adjacent a group of cylinder bores arranged annularly in a punp cylinder of said hydraulic pump, said low and high pressure oil passages being communicated with said cylinder bores through an intake valve and a discharge valve, respectively, a radially extending valve port being provided to receive a clutch valve which is capable of opening and closing said valve port for communication between said low and high pressure oil passages.

Claim 29

Dependent Claim 103 words

The transmission according to claim 24, wherein said high pressure oil passage is provided at a radially inner side position than said low pressure oil passage, and said clutch valve is normally biased so as to project outwardly from said valve port by oil pressure of said high pressure oil passage acting on a radial inner end portion thereof, and wherein means is provided to control movement of said clutch valve into and out of said valve port, said clutch valve increasing an amount of communication between said low and high pressure oil passages as said valve projects out from said valve port.

Claim 30

Dependent Claim 154 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate hydraulic pump and a swashplate type hydraulic motor, comprising an annular low pressure oil passage and an annular high pressure oil passage, said annular low and high pressure oil passages being concentrically formed with each other at a position adjacent a group of cylinder bores annularly arranged in a pump cylinder of said hydraulic pump, said low and highpressure oil passages being communicated with said cylinder bores through an intake valve and a discharge valve, respectively, a plurality of radially extending valve ports being provided to respectively receive a plurality of clutch valves which are capable of opening and closing said valve ports for communication between said low and high pressure oil passages, and a common clutch control ring for opening and closing said clutch valves being supported on an outer peripheral surface of said pump cylinder.

Claim 31

Dependent Claim 154 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate hydraulic pump and a swashplate type hydraulic motor, comprising an annular low pressure oil passage and an annular high pressure oil passage, said annular low and high pressure oil passages being concentrically formed with each other at a position adjacent a group of cylinder bores annularly arranged in a pump cylinder of said hydraulic pump, said low and highpressure oil passages being communicated with said cylinder bores through an intake valve and a discharge valve, respectively, a plurality of radially extending valve ports being provided to respectively receive a plurality of clutch valves which are capable of opening and closing said valve ports for communication between said low and high pressure oil passages, and a common clutch control ring for opening and closing said clutch valves being supported on an outer peripheral surface of said pump cylinder.

Claim 32

Dependent Claim 81 words

The transmission according to claim 26,wherein each of said clutch valves is of a sliding type which opens and closes the corresponding valve port by making a reciprocating sliding movement in the port, and said clutch control ring is axially slidably supported on the outer peripheral surface of said pump cylinder and is provided at an inner peripheral surface thereof with a tapered surface for imparting opening and closing movement to said clutch valve by axial sliding movement of the ring.

Claim 33

Dependent Claim 27 words

The transmission according to claim 26 or 27, wherein said high pressure oil passage is positioned on a radially inner side than said low pressure oil passage.

Claim 34

Dependent Claim 26 words

The transmission according to claim 28, wherein said clutch valve has a radial inner end, on which oil pressure within said high pressure oil passage acts.

Claim 35

Dependent Claim 21 words

The transmission according to any of claims 24 to 29, wherein said swashplate type-hydraulic pump is of a constant capacity type.

Claim 36

Dependent Claim 22 words

The transmission according to any of claims 24 to 29, wherein said swashplate type hydraulic motor is of a variable capacity type.

Claim 37

Dependent Claim 110 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, said hydraulic motor having an odd-number of motor plungers respectively slidably fitted in cylinder bores annularly arranged in a motor cylinder, wherein a speed change control device is provided to adjust an angle of inclination of a tiltable motor swashplate, which is in pressure contact with said odd number of motor plungers, by making use of pulsations in intensity of a thrust load caused during operation on an operation surface of the motor swashplate between both sides of a tilting axis as a border.

Claim 38

Dependent Claim 110 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a swashplate type hydraulic motor, said hydraulic motor having an odd-number of motor plungers respectively slidably fitted in cylinder bores annularly arranged in a motor cylinder, wherein a speed change control device is provided to adjust an angle of inclination of a tiltable motor swashplate, which is in pressure contact with said odd number of motor plungers, by making use of pulsations in intensity of a thrust load caused during operation on an operation surface of the motor swashplate between both sides of a tilting axis as a border.

Claim 39

Dependent Claim 159 words

The transmission according to claim 32, wherein said speed change control device comprises a trunnion shaft for tiltably supporting a swashplate holder which carries said motor swashplate on a stationary casing; an operating lever secured to said trunnion shaft for integral rotation with said trunnion shaft; a piston operatively associated with said operating lever and being slidingly movable within a stationary cylinder in response to rotation of said operating lever; first and second oil chambers defined between said cylinder and piston, said first and second oil chambers being opposed to each other with said piston interposed therebetween; a hydraulic conduit providing communication between said first and second oil chambers and filled therein with working fluid; and a speed change control valve incorporated in said hydraulic conduit to control communication and interruption between said first and second oil chambers through said hydraulic conduit and permit flow of said working oil within the hydraulic conduit in one direction during their communication.

Claim 40

Dependent Claim 47 words

34 . The transmission according to claim 33,wherein when communication between said first and second oil chambers is interrupted, said motor swashplate is locked untiltably, whilst when both the oil chambers are communicated with each other, said angle of inclination of the motor swashplate is made variable.

Claim 41

Dependent Claim 230 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a variable capacity and swashplate type hydraulic motor, said hydraulic motor having a plurality of motor plungers respectively slidably fitted in cylinder bores annularly arranged in a motor cylinder thereof, wherein a speed change control device is provided so as to adjust, during operation, an angle of inclination of a tiltable motor swashplate in pressure contact with said plurality of motor plungers, said speed change control device comprising a trunnion shaft for tiltably supporting a swashplate holder which supports said motor swashplate on a stationary casing; an operating lever secured to said trunnion shaft for integral rotation therewith; a piston operatively associated with said operating lever and being slidingly movable with a stationary cylinder in response to rotation of the operating lever; first and second oil chambers defined between said cylinder and piston, said both oil chambers being opposed to each other with said piston interposed therebetween; a hydraulic conduit providing communication between said first and second oil chambers and filled therein with working fluid; and a speed change control valve incorporated in said hydraulic conduit to control communication and interruption between said first and second oil chambers through said hydraulic conduit and permit flow of said working fluid within the hydraulic conduit in one direction during their communication.

Claim 42

Dependent Claim 230 words

A static hydraulic pressure type continuously variable transmission formed with a hydraulic closed circuit between a swashplate type hydraulic pump and a variable capacity and swashplate type hydraulic motor, said hydraulic motor having a plurality of motor plungers respectively slidably fitted in cylinder bores annularly arranged in a motor cylinder thereof, wherein a speed change control device is provided so as to adjust, during operation, an angle of inclination of a tiltable motor swashplate in pressure contact with said plurality of motor plungers, said speed change control device comprising a trunnion shaft for tiltably supporting a swashplate holder which supports said motor swashplate on a stationary casing; an operating lever secured to said trunnion shaft for integral rotation therewith; a piston operatively associated with said operating lever and being slidingly movable with a stationary cylinder in response to rotation of the operating lever; first and second oil chambers defined between said cylinder and piston, said both oil chambers being opposed to each other with said piston interposed therebetween; a hydraulic conduit providing communication between said first and second oil chambers and filled therein with working fluid; and a speed change control valve incorporated in said hydraulic conduit to control communication and interruption between said first and second oil chambers through said hydraulic conduit and permit flow of said working fluid within the hydraulic conduit in one direction during their communication.

Claim 43

Dependent Claim 47 words

The transmission according to claim 35 , wherein when communication between the first and second oil chambers is interrupted, said motor swashplate is untiltably locked, whereas when both the oil chambers are communicated with each other, said angle of inclination of the motor swashplate is made variable.

Claim 44

Dependent Claim 23 words

The transmission according to any ' of claims 32 to 36, wherein said swashplate type hydraulic pump is of a constant capacity type.

Static hydraulic pressure type continuously variable transmission

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