Patent ID: 6074188
Filing Date: 2000-06-13
Classification: F04C

Abstract:
A hydraulic pressure device comprising a housing, a drive shaft, said drive shaft being rotatively connected to said housing, said drive shaft having an end, said end of said drive shaft extending from said housing,a fluid pressure device, said fluid pressure device being in said housing, said fluid pressure device having a movable member, means to drivingly connect said movable member to said drive shaft, said fluid pressure device having expanding and contracting pressure cells,said housing including a stationary manifold, said manifold having bi-directional manifold passages fluidically connected to said pressure cells of said fluid pressure device respectively,a rotating valve, said rotating valve having an outer circumferential surface, means to rotatively support said rotating valve to said housing for rotational movement in respect thereto by said outer circumferential surface of said rotating valve, said rotating valve including two sets of uni-directional valving passages, said rotating valve including a plurality of flat plates, said flat plates being formed with selective cross-sectional parts of said valving passages, said flat plates being consecutively sequentially located flat surface to flat surface, said flat plates being connected together in a leak proof manner to form said valving passages, said rotating valve having a commutation surface plate and a valving surface plate, said commutation surface plate being on the opposite axial side of said rotating valve from said valving surface plate, said commutation surface plate having a central opening, said central opening being fluidically connected to one of said two sets of uni-directional valving passages, said housing having an inlet port and an outlet port, central opening connect means at said commutation surface to fluidically connect said central opening to one of said inlet port or said outlet port, other connect means to fluidically connect the other of said two sets of uni-directional valving passages to the other of said inlet port or said outlet port,a balancing ring, said balancing ring being located within said housing adjacent to said commutation surface, said balancing ring extending between said housing and said commutation surface, said balancing ring having an open center, said open center of said balancing ring being in communication with said central opening of said commutation surface of said rotating valve, said means at said commutation surface to fluidically connect said central opening to one of said inlet or said outlet port including said open center of said balancing ring, said balancing ring fluidically sealing one of said inlet or said outlet port from the other of said inlet port or outlet port, means to drivingly connect said rotating valve to said drive shaft, and means at said valving surface of said rotating valve to selectively fluidically connect said two sets of uni-directional valving passages in said rotating valve to said bi-directional manifold passages in said stationary manifold.