公开(公告)号：CA1270723A

公开(公告)日：1990-06-26

申请号：CA500119

申请日：1986-01-22

Applicant: APPLIED POWER INC

Inventor： JANECKE JAMES P ,  PATEL KISHOR J

IPC: F16K17/30 ,  G05D16/16 ,  G05D16/20 ,  G05D16/00

Abstract: A hydraulic pressure control valve includes a spool which has a first end having a first cross-sectional area. The opposite end of the spool has a reduced cross-sectional area. Modulated pressure is provided to a chamber at the first end of the spool and when it increases beyond the force of a biasing spring, an inlet port is connected to an outlet port. Feedback pressure acts on the differential area between a full cross-sectional area of the spool and a reduced area portion of the spool located within the outlet port. The feedback force on the spool is in proportion to the changing control force. A sleeve is provided at the end of the valve adjacent the reduced area portion of the spool, such portion and sleeve cooperating to provide a sliding seal. The outlet port will be coupled to tank whenever the modulated pressure falls below the combination of the spring force and the feedback pressure. 4420p/03-25-85

公开(公告)号：EP0513043A4

公开(公告)日：1994-08-24

申请号：EP91902455

申请日：1990-12-24

Applicant: APPLIED POWER INC

Inventor： PATEL KISHOR J ,  STOBBS THOMAS J

IPC: B60G17/08 ,  B60T8/36 ,  B60T15/02 ,  F16F9/46 ,  F16F9/50 ,  F16K31/06 ,  G05D16/20

CPC classification number: B60T8/3665 ,  B60G2400/204 ,  B60G2400/252 ,  B60G2400/90 ,  B60G2500/10 ,  B60G2600/26 ,  B60T15/028 ,  F16F9/46 ,  G05D16/2086 ,  Y10T137/7613

Abstract: A proportional pressure control valve is disclosed which may be used for uni-directional or bi-directional fluid flow. An electromagnetic driver (35, 251, 360) mounted in a driver cavity (36, 353) of a housing produces a magnetic flux path in response to a variable input current. The magnitude of the flux path is substantially proportional to the input current. The flux path passes through an armature (40, 276) which is movable within the driver cavity. The armature is connected to a metering spool (64, 209, 260) so that the two move in unison. The metering spool is movable within a main bore between a sealing position and an infinite number of open positions. The position of the metering spool determines the magnitude of fluid communication between pressure ports. A feedback section (85, 98) of the housing establishes a pressure feedback force which impacts on the position of the metering spool and the armature. The valve may also include a spring (272) for biasing the metering spool to a fail-safe position within the housing. The proportional pressure control valve can be incorporated into a damper of a vehicle suspension system where the input current is governed by an electronic control unit (56) of the vehicle. The electronic control unit (56) may be responsive, in part, to the position of the suspension system through the use of a position feedback sensor (101).