Hydrostatic motor or pump and hydrostatic transmissions

Claim 2

A hydraulic mechanism comprising a support, a cylInder mounted for universal movement in the support, a piston reciprocable with sliding contact in the cylinder means for admitting and exhausting fluid from the chamber formed between the piston and cylinder, means for maintaining the hydraulic forces acting on said cylinder in a balanced state at all times, a crank, means on the crank in engagement with the piston for mounting the piston in sliding contact with the crank, recesses in the piston portion in sliding contact with the crank, means for supplying lubricant continuously to each of the recesses, and additional means for selectively supplying lubricant continuously or intermittently or to cut off the supply of lubricant to each of the said recesses.

Claim 3

A device as defined in claim 1 wherein the mounting of the cylinder in the support comprises a spherical surface on the cylinder and socket means in the support engaging said spherical surface at zones on opposite sides of a diametral plane through said spherical surface, and further including means for supplying fluid to a portion of the zone on the side of said diametral plane opposite the crank and at a pressure equal to that in the chamber whereby to substantially counteract the fluid pressure acting between the piston and cylinder urging the cylinder against the socket means.

Claim 4

A device as defined in claim 1 wherein the means for supplying lubricant continuously comprises a conduit in the piston connecting each of said recesses to the end of the piston in the cylinder.

Claim 5

A hydraulic mechanism comprising a support, a cylinder mounted for universal movement in the support, a piston reciprocable with sliding contact in the cylinder, means for admitting and exhausting fluid from the chamber formed between the piston and cylinder, means for maintaining the hydraulic forces acting on said cylinder in a balanced state at all times, a crank, means on the crank in engagement with the piston for mounting the piston in sliding contact with the crank, recesses in the piston portion in sliding contact with the crank, means for supplying lubricant continuously to each of the recesses comprising a conduit in the piston connecting each of said recesses to the end of the piston in the cylinder, and additional means for selectively supplying lubricant continuously or intermittently or cutting off the supply of lubricant to each of said recesses, comprising a supply conduit in the wall of the cylinder, a conduit in the piston connecting each of said recesses with a wall of the piston, and means for varying the throw of the crank, whereby the conduit in the piston is continuously in register with the supply conduit, or continuously out of register with said supply conduit, or is intermittently in register with the said supply conduit.

Claim 6

A hydraulic mechanism comprising a support, a cylinder mounted for universal movement in the support, a piston reciprocable with sliding contact in the cylinder, means for admitting and exhausting fluid from the chamber formed between the piston and cylinder, means for maintaining the hydraulic forces acting on said cylinder in a balanced state at all times, a crank, means on the crank in engagement with the piston for mounting the piston in sliding contact with the crank, recesses in the piston portion in sliding contact with the crank, means for supplying lubricant continuously to each of the recesses comprising a conduit in the piston connecting each of said recesses to the end of the piston in the cylinder, and additional means for selectively supplying lubricant continuously or intermittently or cutting off the supply of lubricant to each of said recesses, comprising a supply conduit in the wall of the cylinder, a conduit in the piston connecting each of said recesses with a wall of the piston, and means for varying the throw of the crank, whereby the conduit in the piston is continuously in register with the supply conduit, or continuously out of register with said supply conduit, or is intermittently in register with the said supply conduit.

Claim 7

A hydraulic mechanism comprising a support, a cylinder mounted for universal movement in the support, a piston reciprocable with sliding contact in the cylinder, means for admitting and exhausting fluid from the chamber formed between the piston and cylinder, means for maintaining the hydraulic forces acting on said cylinder in a balanced state at all times, a crank, and means on the crank in engagement with the piston for mounting the piston in sliding contact with the crank, said crank being an eccentric and further including means for angularly adjusting the eccentric whereby to vary the travel of the piston in the cylinder.

Claim 8

A hydraulic mechanism comprising a support, a cylinder mounted for universal movement in the support, a piston reciprocable with sliding contact in the cylinder, means for admitting and exhausting fluid from the chamber formed between the piston and cylinder, means for maintaining the hydraulic forces acting on said cylinder in a balanced state at all times, a crank, and means on the crank in engagement with the piston for mounting the piston in sliding contact with the crank, said crank being an eccentric and further including means for angularly adjusting the eccentric whereby to vary the travel of the piston in the cylinder.

Claim 9

A hydraulic mechanism comprising a support, a plurality of cylinders angularly spaced in the support and mounted for universal movement therein, an eccentric rotatably mounted in the support, a piston reciprocably mounted in each cylinder in sliding contact therewith and in sliding engagement with the eccentric, means for admitting and exhausting fluid in timed relation to and from the chambers formed between each of the pistons and cylinders, means for maintaining the hydraulic forces acting on said cylinder in a balanced state at all times, and means for angularly adjusting the eccentric to adjust the travel of the pistons iN the cylinders.

Claim 10

A hydraulic mechanism comprising a support, a plurality of cylinders angularly spaced in the support and mounted for universal movement therein, an eccentric rotatably mounted in the support, a piston reciprocably mounted in each cylinder in sliding contact therewith and in sliding engagement with the eccentric, means for admitting and exhausting fluid in timed relation to and from the chambers formed between each of the pistons and cylinders, means for maintaining the hydraulic forces acting on said cylinder in a balanced state at all times, and means for angularly adjusting the eccentric to adjust the travel of the pistons iN the cylinders.

Claim 11

The hydraulic mechanism of claim 6 having means for maintaining the hydraulic forces acting on said piston in a balanced state at all times.

Claim 12

A device as defined in claim 6 wherein the means for angularly adjusting the eccentric comprises a gear train and means for driving said train.

Claim 13

A device as defined in claim 6 wherein the means for admitting and exhausting fluid comprises a valve for each piston and cylinder, a valve eccentric rotatably adjustably mounted on the shaft, and means connecting the valves to the said valve eccentric to be driven thereby.

Claim 14

A device as defined in claim 9 wherein the means connecting the valves to the valve eccentric comprises a track slidably mounted on the valve eccentric, means slidably connecting each valve to the track, and means pivotally securing only one of said valves to the track.

Claim 15

A device as defined in claim 9 wherein the means for adjusting the valve eccentric comprises means defining a slot secured to the first mentioned eccentric and means defining a tongue secured to the valve eccentric and extending into the slot.

Claim 16

A device as defined in claim 6 wherein the eccentric comprises a shaft with an eccentric portion and an annulus having a spherical surface eccentrically mounted on the eccentric portion in sliding engagement with each piston.

Claim 17

A device as defined in claim 9 further including balance weights secured to opposite axial sides of the first mentioned eccentric to dynamically balance the eccentric and pistons for rotation about the axis of the eccentric portion of the shaft and other balance weights secured to the shaft on opposite sides of said first mentioned eccentric and the balance weights secured thereto to dynamically balance the mass of the said first mentioned eccentric and balance weights for rotation about the axis of the shaft.

Claim 18

A device as defined in claim 12 wherein the means for angularly adjusting the eccentric comprises a gear train connected to the annulus, a gear train connected to the shaft, means connecting said trains to a common shaft, and separate means for driving each train.

Claim 19

A device as defined in claim 14 wherein the separate means comprises an internal gear connected to each of the trains and power means connected to each of said internal gears for adjustably rotating each of said internal gears.

Claim 20

A device as defined in claim 15 further including means for locking the internal gears against rotation by reaction of the gear trains.

Claim 21

A device as defined in claim 16 wherein the locking means comprises separate gears in meshing engagement with each internal gear and each other.