Slant plate type hydraulic device

Claim 1

A slant plate type hydraulic device comprising: (a) a frame; (b) a cylinder rotatably mounted in said frame; (c) a plurality of plunger means slidably fitted into said cylinder, said plunger means being positioned in a circular pattern about the axis of said cylinder; (d) holder means; (e) slant plate means wherein said holder means holds said slant plate means such that said slant plate means and cylinder are rotatable with respect to one another; (f) a plurality of shoe means, each said shoe means being universally, rotatably mounted on one of said plunger means, wherein said shoe means are in sliding contact with said slant plate means; and (g) biasing means for holding said shoe means in contact with said plate means, said biasing means comprising a seat plate contacting said shoe means on a side thereof opposite to the side which contacts said slant plate means; a press plate which is spline-connected to the holder means in an axially slideable manner; bearing means between said seat plate and said press plate for permitting the relative movement therebetween; and spring means contacting said press plate for pushing said press plate, bearing means and seat plate toward said shoe means, thereby holding said shoe means in contact with said slant plate.