Swash plate type servo device for a plunger hydraulic unit

Details Swash plate type servo device for a plunger hydraulic unit Swash plate type servo device for a plunger hydraulic unit

2005-10-04

2005-10-04

Look, Edward K. (Department: 3745)

Expansible chamber devices

Displacement control of plural cylinders arranged in...

Parallel cylinders

C091S506000

Reexamination Certificate

active

06951164

ABSTRACT:
A hydraulic motor includes a motor cylinder having motor plunger holes, motor plungers disposed in the respective plunger holes, a motor rolling member which is tilted and rolled to change the angle of a swash plate, and a motor servo mechanism for tilting and rolling the motor rolling member. The motor servo mechanism includes a screw shaft with male screw, a ball nut having a ball thread mated to the male screw and connected to an arm portion of the motor rolling member, a swash plate control motor, and a stopper mounted to the end of the screw shaft. The stopper includes a ring portion adjacent to the end of the male screw at a limit position of the ball nut and a flange portion which contacts the side face of the ball nut at the limit position.

REFERENCES:
patent: 4916901 (1990-04-01), Hayashi et al.
patent: 5038634 (1991-08-01), Matsuto et al.
patent: 63140163 (1988-06-01), None
patent: 06002753 (1994-01-01), None
patent: 2001343060 (2001-12-01), None

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