Hydraulic radial piston motor
AssigneeAB Hagglund & Soner
InventorEinar Samuelsson
Life of this patent
Estimating the term…
Abstract
A hydraulic radial piston motor with a cam disc and a cylinder block with a number of pistons running in cylinders in the block presses rollers against the cam disc in such a way that a torsional moment arises. The rollers are formed with guide members running in slots in guide units which take up tangential forces. The rollers are mounted in roller cages which are formed with hydrostatic bearings. At their outer end each piston is formed with a part-spherical bearing surface and the roller cage has a cooperating part-spherical bearing surface, which allows angular movements between the roller cages and the pistons in all directions.
Claims18
In a hydraulic radial piston motor which includes a housing;
- a cam disc which has an internal cam surface;
- a cylinder block havng a plurality of radially disposed cylinders;
- a plurality of pistons, a respective piston being slidably disposed in a respective cylinder;
- a plurality of roller cages, each roller cage being located between a respective piston and the cam disc, and each roller cage including an outer bearing surface which is shaped as part of the internal surface of a cylinder;
- two guide units fixedly joined to the cylinder block, each guide unit including radially inwardly directed guide slots, the guide slots being in register on opposite sides of each respective roller cage;
- a plurality of cam-follower rollers, each cam-follower roller being located in a respective roller cage and having an outer surface which rolls against the internal cam surface of the cam disc, each cam-follower roller including a shaft pin at its opposite ends which mount respective guide bearings, the respective guide bearings being movable in the associated guide slots of the guide units and transmitting tangential forces that act on the cam-follower rollers to the guide units and thus to the cylinder block, the improvement wherein
- each roller cage and associated piston are separate elements which are movable with respect to one another, each roller cage having an inner bearing surface and each piston having an outer bearing surface constructed such that angular motions therebetween are possible in all directions, and
- each roller cage includes a hydrostatic bearing which cooperates with the outer surface of the associated cam-follower roller.
Dependencies are inferred from the claim text.