초록 ▼

A fluid pressure operated device including a gerotor (17) including an orbiting and rotating star (27). A balancing plate (19) is biased into engagement by means of pressurized fluid in a space (102), with an adjacent end surface (28) of the star (27). Adjacent the balancing plate (19) is a housing

A fluid pressure operated device including a gerotor (17) including an orbiting and rotating star (27). A balancing plate (19) is biased into engagement by means of pressurized fluid in a space (102), with an adjacent end surface (28) of the star (27). Adjacent the balancing plate (19) is a housing member (21) defining a seal chamber (83), in which is disposed a seal assembly (89), including a support member (91) and a seal member (93) disposed radially inward from the support member. The outer periphery (92) of the support member (91) is disposed radially outward of a tangent circle (TC) of the bolts (11), thereby moving the pivot point (PP) of the balancing plate (19) further outward radially. This results in an improved ability of the balancing plate to follow the end surface of the gerotor star, whether the height of the star is more or less than that of the gerotor ring (23). As a result, volumetric efficiency is improved, even while the manufacturing cost of the gerotor gear set (17) may be reduced.

대표청구항 ▼

A fluid pressure operated device comprising housing means defining a fluid inlet port and a fluid outlet port; a fluid pressure displacement mechanism is associated with said housing means and including an internally-toothed ring member and an externally-toothed star member eccentrically disposed wi

A fluid pressure operated device comprising housing means defining a fluid inlet port and a fluid outlet port; a fluid pressure displacement mechanism is associated with said housing means and including an internally-toothed ring member and an externally-toothed star member eccentrically disposed within said ring member; said ring member and said star member having relative orbital and rotational movement, and inter-engaging to define expanding and contracting fluid volume chambers in response to said orbital and rotational movement; valve means cooperating with said housing means to provide fluid communication between said fluid inlet port and said expanding volume chambers, and between said contracting volume chambers and said fluid outlet port; said housing means comprising an end cap member disposed rearwardly of said ring member and a housing member disposed forwardly of said ring member; seal means disposed between said ring member and said endcap member and seal means disposed between said ring member and said housing member, and a plurality of fasteners disposed in fastener bores, said fasteners maintaining said end cap member and said housing member in tight, sealing engagement relative to said ring member, said fasteners being disposed radially inward from said seal means; a balancing plate disposed between said ring member and said housing member and adapted to be closely disposed to an adjacent end surface of said star member, to minimize fluid leakage therebetween; characterized by: (a) one of said housing member and said balancing plate defining a seal chamber in open communication with said fastener bores; (b) a seal assembly disposed in said seal chamber, said seal assembly including a seal support member conforming substantially to an outer peripheral surface of said seal chamber and to said plurality of fasteners; and (c) said seal assembly further including a seal member disposed radially inward from said seal support member, and restrained in the radially outward direction thereby when said seal member is subjected to fluid pressure.