MANUAL HYDRAULIC PUMP DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a manual hydraulic pump of a simple structure and a few number of components, and not to easily generate air accumulation.

SOLUTION: A plurality of piston holes 13 reaching a rear end part from a front surface are bored on a cylinder block 10 with intervals in a circumference direction. A piston 14 provided with a spherical head part 14a as one body and having a blocked bottom end is inserted in each piston bore 13 slidably in a fore-aft direction. The spherical head parts 14a of the pistons 14 are abutted on a swash plate 15 attached to a front part in a pump housing 2 with inclining in relation to a center axis. A spring seat 17 provided with a locking groove 18a capable of locking on the spherical head part 14a is installed rotatably as one body around a shaft 5 and movable in the fore-aft direction with inclining in parallel with the swash plate 15. A coil spring 19 is compressed in a gap between the cylinder block 10 around the shaft 5 to energize the piston 14 forward via the spring seat 17.

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