Patent ID: 8302525

Claim:
A hydraulic apparatus comprising: a movable swash plate of a hydraulic pump or motor having a plunger and having a variable capacity; and a hydraulic servo mechanism configured to slant the movable swash plate, the hydraulic servo mechanism comprising: a slanting piston connected to one end of the movable swash plate and configured to slantingly drive the movable swash plate; a servo spool arranged perpendicularly to a slide direction of the slanting piston and substantially parallel to the movable swash plate; a feedback link connecting the servo spool to the movable swash plate; and a casing housing the slanting piston and the servo spool, wherein: the feedback link is substantially parallel to the slanting piston, one end portion of the feedback link is pivotally connected to the movable swash plate, a middle portion of the feedback link is pivotally connected to the servo spool, and another end portion of the feedback link is pivotally connected to the casing.