Radial piston pump and motor

In a hydraulic radial piston power transmitting assembly having:

• a housing, a back plate connected to the housing having a fixed pintle attached thereto with intake and discharge ports therein;
• a cylinder block rotatably mounted on the pintle having a plurality of radially spaced cylinder bores therein connected to the inside diameter of the cylinder block, each bore containing reciprocating pistons with a slipper shoe connected thereto;
• a drive shaft passing through the housing;
• a coupling means connecting the drive shaft to the cylinder block;
• a cam ring surrounding the cylinder block and pistons pivotally connected to the housing allowing limited movement of the ring to vary the piston stroke in the cylinder block, the improvement comprising lateral cam ring positioning means including:
• a retaining surface in said housing parallel to the back plate and defining therebetween a space to receive and contain the cam ring,
• a plurality of shallow pockets in the retaining surface adjacent the cam ring and a plurality of non-metallic pads positioned in said pockets, the pads having a thickness greater than the pockets whereby the cam ring rides between the pads and the back plate to minimize noise and wear.

In a hydraulic radial piston power transmitting assembly having:

• a housing, a back plate connected to the housing having a fixed pintle attached thereto with intake and discharge ports therein;
• a cylinder block rotatably mounted on the pintle having a plurality of radially spaced cylinder bores therein connected to the inside diameter of the cylinder block, each bore containing reciprocating pistons with a slipper shoe connected thereto;
• a drive shaft passing through the housing;
• a coupling means connecting the drive shaft to the cylinder block;
• a cam ring surrounding the cylinder block and pistons, pivotally connected to the housing allowing limited movement of the ring to vary the piston stroke in the cylinder block, the improvement comprising cam ring positioning means including:
• a control arm means rotatably mounted in said assembly;
• a swivel means anchored to the cam ring having a spherical surface thereon for positioning the cam ring and controlling the displacement of the assembly;
• and
• a sleeve means slidably received on the control arm means and including a lateral bore for sliding receipt of said spherical surface of the swivel means whereby the swivel means pivots about the center of its arcuate surface and slides linearly in the lateral bore to accommodate the locus of points which define the cam ring's various displacement positions.