| 摘要 |
A motor or pump assembly comprises a cylinder block with a plurality of radially positioned cylinders, a piston arranged slidably reciprocable in each of the cylinders, a cam ring cooperating with the pistons and being rotatably journalled on the cylinder block, and a distributor valve arranged centrally in the cylinder block to control a flow of fluid to and from the cylinders in operation. To obtain a relatively large diameter on the rollers and thereby less wear on both the cam ring and the rollers while reducing the outside diameter of the assembly, the rollers are journalled without axial lateral guide at the top end of the pistons, the pistons being guided by the sides in a groove provided in the cam ring. The material of the pistons is moreover removed from both sides as far as the roller so that the piston with a central portion can follow the roller into the groove, whose depth thereby partly overlaps the travel of the piston.
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