Variable displacement mechanism for swash plate type hydraulic pump and motor

Abstract

A variable displacement mechanism for a swash plate hydraulic pump or motor, in which a swash plate, a swash plate guiding wall, a tilting control piston, and a swash plate tilting guiding and swash plate rotation preventing pin are included for varying the requiring flow rate (volumetric displacement) per revolution without the rotation of the swash plate even during the tilting of the swash plate angle and during the rotation of the hydraulic pump or motor. The periphery of the swash plate is spherical for smoothing the tilting of the swash plate, and a securing pin accommodating slot is formed on the lower portion of the swash plate. Further, there are provided a securing pin for preventing rotation of the swash plate, and a bore formed on the bottom of a front cover for installing the securing pin. A housing or the front cover is provided with a guide wall for guiding the tilting of the swash plate, so that the volumetric displacement can be varied even during the rotation of the hydraulic pump or motor, thereby varying the discharge rate of the hydraulic pump or varying the rotating speed of the hydraulic motor in a safe manner.

Dependencies are inferred from the claim text.