METHOD OF MANUFACTURING PIN HOLDING RING FOR INTERNAL GEAR, INTERNALLY MESHED PLANETARY GEAR STRUCTURE, AND HYDRAULIC MOTOR AND PUMP

摘要

The method involves the steps of drilling circular pin retention bores (113a) in a ring base material before the inner diameter DA of a pin holding ring base material (151) is machined to a finish the diameter. The inner diameter is expansion-machined to a finish diameter after the inner surfaces of the pin holding holes have been surface-finished by a roller burnishing machining. Independent claims are included for: an internal meshing gearing having an internal gear and an external gear put into internal mesh with the internal gear, the internal gear consisting of the pin retaining ring having a number of axially-extending pin retaining semi-circular holes in its inner periphery into which pins are fitted; and a hydraulic motor pump having meshing internal and external gears.