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hydraulic pressure control valve

A hydraulic pressure control valve for an oil chamber in a hydraulic multiplate clutch assembly is disclosed. The hydraulic pressure control valve is to be mounted on a pressing piston in the hydraulic multiplate clutch assembly. The hydraulic pressure control valve includes a valve plate composed of a leaf spring for controlling a leak hole formed through the pressing piston; and a single-piece weight staked on the valve plate such that valve-opening force for the leaf spring is increased under centrifugal force.

1. A hydraulic pressure control valve for an oil chamber in a hydraulic multiplate clutch assembly, said hydraulic pressure control valve being to be mounted on a pressing piston in said hydraulic multiplate clutch assembly, comprising: a valve plate comprising a leaf spring for controlling a leak hole formed through said pressing piston; and a single-piece weight staked on said valve plate such that valve-opening force for said leaf spring is increased under centrifugal force.
2. A hydraulic pressure control valve according to claim 1, wherein said valve plate comprises a leaf spring in a form of a straight planar plate; and said single-piece weight has a symmetrical shape with respect to a centerline relative to a direction of a width of said valve plate.
3. A hydraulic pressure control valve according to claim 2, wherein said valve plate is provided with a stake hole formed therethrough; said single-piece weight comprises a cylindrical portion and a flange portion extending outwardly from an end part of said cylindrical portion; and said cylindrical portion extends through said stake hole and is staked at an opposite end part thereof to hold said valve plate between said flange portion and said staked opposite end part.
4. A hydraulic pressure control valve according to claim 2, wherein said valve plate is provided with a stake hole formed therethrough and an insertion slot extending from said stake hole to a side edge of said valve plate; said single-piece weight comprises a block with slits formed on opposite ends of said block, respectively, to define an H-shaped cross-section; said single-piece weight has been inserted into said stake hole through said insertion slot while being guided at said slits thereof by corresponding edge portions of said insertion slot; and said single-piece weight is staked on said valve plate.
5. A hydraulic pressure control valve according to claim 4, wherein said block is cylindrical.
6. A hydraulic valves according to claim 4, wherein said block is provided with a further slit formed on a leading end of said block as viewed in a direction of insertion of said single-piece weight through said insertion slot.
7. A hydraulic pressure control valve according to claim 2, wherein said valve plate is provided with a stake hole formed therethrough and an insertion slot extending from said stake hole to a side edge of said valve plate, said single-piece weight comprises a disc-shaped portion, a head portion extending from said disc-shaped portion, and slits formed on opposite ends of said single-piece weight at intermediate positions between said disc-shaped portion and said head portion; said single-piece weight has been inserted into said stake hole through said insertion slot while being guided at said slits thereof by corresponding edge portions of said insertion slot; and said head portion is staked to hold said valve plate between said disc-shaped portion and said staked head portion.
8. A hydraulic pressure control valve according to claim 7, wherein said single-piece weight is provided with a further slit formed on a leading end of said single-piece weight as viewed in a direction of insertion of said single-piece weight through said insertion slot.

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