Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Motive fluid bypass to or from assembly
Patent
1990-12-21
1992-03-10
Smith, Leonard E.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Motive fluid bypass to or from assembly
F01B 300, F04B 112, F04D 130
Patent
active
050941461
ABSTRACT:
An axial piston type motor for a hydrostatic transmission, wherein the motor is arranged to generate an output torque at the drive flange uses a Rzeppa joint (32) to couple the drive flange (10) with the cylinder barrel (16). The center of the Rzeppa joint (32) is located in the tilting point (60) between the axes of the drive flange (10) and of the cylinder barrel (16). The number of balls (42) of the Rzeppa joint (32) is equal to the number of pistons (24). The outer joint member of the Rzeppa joint (32) is formed by the drive flange (10). The balls (42) and grooves (40) of the Rzeppa joint (32) are angularly offset with respect to the ball-and-socket joints (28,30) of the pistons (24) by half the angular spacing of the ball-and-socket joints and extend up to the space between the ball-and-socket joints. In connection therewith, different possibilities of guiding the cylinder barrel directly at the barrel support (12) or indirectly at the valving body, which itself is supported on the barrel support (12), are described. The frictional forces between valving body and the cylinder barrel are reduced by pressure fields. The valving body is relieved from hydraulic forces to ensure that the valving surface may align itself with the cylinder barrel (16).
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