Cylinder block and swash plate type hydraulic rotary device equipped with it

摘要

PROBLEM TO BE SOLVED: To provide a cylinder block capable of improving a cooling effect of a sliding surface according to a number of cylinder bores, a number of rotations and the like. SOLUTION: A cylinder block 12A is a cylinder block 12A in which a plurality of cylinder bores 20 having an opening are formed in an end surface 12c on a piston insertion side, and when the pistons 13 are rotated, the pistons 13 inserted in the cylinder bores slide back and forth. The block includes a cooling unit 50, and the cooling unit has a plurality of cooling holes 51 extending in the axial direction of the cylinder block from the end face on the piston insertion side formed between adjacent cylinder bores. [Selection diagram] Fig. 2