OIL HYDRAULIC PISTON PUMP AND RETAINER FOR OIL HYDRAULIC PISTON PUMP

摘要

A hydraulic piston pump and a retainer for the same are provided to reduce friction force and improve the stability of a movement when a piston reciprocates to a cylinder block by making the piston supported with the retainer. A retainer(1) for a hydraulic piston pump includes a piston connection port(15), an unit panel(10), and a piston. The piston connection port is penetrated in front and rear surfaces of the retainer. A bottom surface verge unit(14) of the unit panel is longer than a top surface verge unit(12). The unit panel forms an isosceles trapezoid by four side units. The unit panel is coupled with both sides by a cutting unit(20) of the same length of a side surface verge unit(16) of the unit panel to form a top opening unit(30) in a shape of an equilateral polygon due to the top surface verge unit of the unit panels. A bottom of the retainer forms a bottom opening unit(40) in a shape of an equilateral polygon formed by the bottom surface verge unit of the unit panels to be coupled with an outside of a cylinder block. The piston is coupled with an inside of the cylinder block to be connected to the piston connection port penetrated on the unit panel.