摘要:
A power steering control valve can activate not only a power assist steering system but also a rear wheel steering system. The control valve includes valve elements relatively displaceable in response to a steering input torque to define therebetween parallel first and second fluid flow paths between an oil pump and a fluid reservoir to produce a first pressure difference in a front power cylinder in response to the steering torque. The valve elements define therebetween variable flow orifice means for producing a second pressure difference in a rear wheel power cylinder in response to the steering torque. The control valve also includes an externally controlled variable flow orifice valve. This orifice valve is arranged with respect to the variable flow orifice means such that it increases fluid flow passing therethrough in response to a second predetermined variable, such as a vehicle speed, to decrease the second pressure difference in the rear wheel power cylinder.
摘要:
A variable assist power steering system comprises a control valve including valve elements relatively displaceable in response to a steering torque to define therebetween two parallel fluid flow paths connected between the fluid source (10) and the fluid reservoir to produce pressure difference in the power cylinder in response to the steering torque. The control valve includes a plurality of bypass paths, each arranged in parallel to one of plurality of serially arranged variable flow orifices forming the two flow paths and each provided with an externally controlled variable flow orifice valve which is operable responsive to a vehicle speed.
摘要:
A control valve includes valve elements relatively displaceable in response to a steering torque to define therebetween two parallel fluid flow paths connected between a fluid source and a fluid reservoir to produce pressure difference in a power cylinder. The control valve comprises a bypass path including a first externally controlled variable flow orifice and a variable flow orifice variable with steering torque and a first externally controlled variable flow orifice valve which are connected in series, a second externally controlled variable flow orifice valve, and a second variable flow orifice variable with steering torque. The bypass path is arranged in parallel with a portion of the two parallel fluid paths, the second externally controlled variable flow orifice valve is arranged in parallel with another portion of the parallel fluid paths, and the second variable flow orifice is arranged in series in the remaining portion of the parallel fluid paths.
摘要:
A variable assist power steering system employing a fluid distributor circuit of the open center type is disclosed. The fluid distributor circuit includes two parallel fluid flow paths connected to both chambers of a power cylinder respectively to produce a pressure differential between the both cylinder chambers in response to steering torque. For modulating the valve characteristics, two additional variable flow restrictors are arranged in series with two main variable flow restrictors and two bypass paths are arranged to bypass the main variable flow restrictors, respectively. The bypass paths are provided with variable flow orifice valves, respectively, which valves are controlled in response to a turning direction of a steering wheel and also to some external signal, such as vehicle speed.
摘要:
A control valve includes valve elements relatively displaceable in response to a predetermined variable (e.g., a steering torque) to define therebetween two parallel fluid flow paths connected between a fluid source and a fluid reservoir to produce pressure different in a power cylinder. The control valve a variable flow orifice that is arranged in series with regard to one of variable flow orifices of the parallel fluid flow paths, and a bypass path including has an externally controlled variable flow orifice valve that has an orifice area variable in response to a second predetermined variable which is different from the first predetermined variable.
摘要:
A power assist steering system comprises a control valve which defines a fluid flow distributor circuit which includes two parallel first and second fluid flow paths connected between the hydraulic fluid source and the fluid reservoir. Inflow control variable flow orifices are arranged in series with two auxiliary variable flow orifices, respectively, which are disposed downstream with regard to the power cylinder, and the outflow control variable flow orifices are arranged in series with another two auxiliary variable flow orifices which are disposed downstream with regard to the power cylinder.
摘要:
A flow control passage fluidly interconnects an output flow passage and a return flow passage to bypass a control valve. A control valve operation modifying variable orifice is disposed in and partly defines the flow control passage. The control valve operation modifying variable orifice is variable in flow area in response to at least one of vehicle control factors other than steering torque. A fixed flow area orifice is disposed in and partly defines the flow control passasge at a location downstream of the control valve operation modifying variable orifice. The control valve has a plurality of steering torque responsive variable orifices and bypass passage means for bypassing at least one of the steering torque responsive variable orifices. A differential pressure passage provides communication between the upstream and downstream sides of the fixed flow area orifice. An actuator is disposed in and partly defines the differential pressure passage. The actuator has a pressure movable part which is movable in response to variation of differential pressure produced by the fixed flow area orifice. The bypass passage means includes a differential pressure responsive variable orifice operatively connected to the pressure movable part of the actuator and variable in flow area in response to movement of the pressure movable part of the actuator.
摘要:
Provided is an epitaxial substrate capable of achieving a semiconductor device that has excellent ohmic contact characteristics as well as satisfactory device characteristics. On a base substrate, a channel layer formed of a first group III nitride that contains at least Al and Ga and has a composition of Inx1Aly1Gaz1N (x1+y1+z1=1) is formed. On the channel layer, a barrier layer formed of a second group III nitride that contains at least In and Al and has a composition of Inx2Aly2Gaz2N (x2+y2+z2=1) is formed such that an In composition ratio of a near-surface portion is larger than an In composition ratio of a portion other than the near-surface portion.
摘要:
A thermoelectric conversion module having a large capacity and a curved surface which can be secured to a corresponding curved surface of a base member is manufactured by inserting N type and P type semiconductor strips into through holes formed in a honeycomb structural body, filling spaces between walls defining the through holes and the semiconductor strips with an electrically insulating filler members made of an easily deformable material such as polyimide resin and silicone resin, cutting the honeycomb structural body into a plurality of thermoelectric conversion module main bodies each having a desired surface configuration, and providing metal electrodes on both surfaces of a thermoelectric conversion module main body such that alternate N type and P type semiconductor elements are connected in cascade.
摘要:
A thermoelectric conversion module having a large capacity and a curved surface which can be secured to a corresponding curved surface of a base member is manufactured by inserting N type and P type semiconductor strips into through holes formed in a honeycomb structural body, filling spaces between walls defining the through holes and the semiconductor strips with filler members, cutting the honeycomb structural body into a plurality of thermoelectric conversion module main bodies each having a desired surface configuration, providing metal electrodes on both surfaces of a thermoelectric conversion module main body such that alternate N type and P type semiconductor elements are connected in cascade, and removing the filler members or the honeycomb structural body and filler members.