Abstract: A chamber having therein a V-belt type continuously variable transmission is separated from another chamber having therein a differential mechanism. These chambers, however, are in fluid communication with an oil pan via generally vertical holes.

Abstract: A hub of an output gear is connected detachably to a rear end of a main power train for an automatic transmission of a front engine rear wheel drive vehicle by means of splines, so that the main power train can be used as a power train of an automatic transmission for a front engine front wheel drive vehicle. The hub of the output gear has an annular groove for receiving a lubricating oil. The annular groove is enlarged in both width and depth so that most of the oil in the annular groove does not rotate together with the output gear and does not hamper the lubricating oil supply through the annular groove.

Abstract: A hydraulic control system comprises a pump driven by an engine to discharge hydraulic fluid, a torque converter having a lock-up clutch with a lock-up clutch piston movable to a clutch released position when fluid pressure within a lock-up release chamber is higher than fluid pressure within a working chamber within a torque converter cavity, a line pressure regulator valve and an orifice which provides a restricted flow communication between the torque converter and the pump even when line pressure generated by the line pressure regulator valve is lower than a predetermined value.

Abstract: In order to prevent excessive pump output drain off and ensure that the hydraulic pressure supplied to a control chamber of a variable capacity pump of a hydraulically controlled automatic automotive transmission control system, is maintained at an appropriate level with respect to the control pressure (line pressure) being utilized in the control system, a pressure limiting valve is disposed between a drain port of a pressure regulating valve and the torque converter which operatively interconnects the prime mover (engine) with transmission. This pressure limiting valve includes a spool which is biased in a direction to reduce the pressure passed therethrough to the torque converter by the pressure prevailing in a feedback chamber which communicates with the conduiting between the valve and the torque converter.

Abstract: A vane pump has a housing comprising a pump cover and a pump housing. The pump cover is integrally formed with a hollow fixed shaft projecting therefrom and inserted loosely into a longitudinal hole of the pump housing. Received in the housing are a cam ring, a rotor eccentrically disposed for rotation within the cam ring, a plurality of vanes radially slidably provided through the rotor, a pair of annular vane rings disposed coaxially with the cam ring and an annular centering member mounted to the base portion of the fixed shaft adjacent the pump cover such that the centering member is arranged in a radially shifted position from the annular vane rings.

Abstract: There is provided a control device for a vane type variable displacement pump. The control device eliminates the need of a hydraulic cylinder to control the eccentricity of a cam ring of the vane pump. A pressure difference between a second chamber and a high pressure side of the pump first chamber on a low-pressure side of the vane pump is utilized to determine the eccentricity of the cam ring. A regulator valve is connected to the first chamber and with the second chamber in order to allow or prevent communication between the two chambers. A spring is also provided to always force the cam ring in a direction so as to make the eccentricity of the cam ring larger.

Abstract: A vacuum system used with an automotive vehicle such that an appropriate negative pressure is maintained within the vacuum system in order to assure the function of the vacuum brake booster even when the vacuum clutch booster is defective with respect to airtightness. A vacuum system according to the present invention comprises a novel second check valve having an orifice formed in the poppet valve or in the valve body, being connected between the intake manifold and the vacuum clutch booster. The second check valve operates as an ordinary check valve in a normal condition but as an orifice in an abnormal condition to prevent the vacuum pressure in the system from being decreased quickly, without use of any conventional vacuum tank.

Abstract: A vacuum system used with an automotive vehicle such that an appropriate negative pressure is maintained within the vacuum system in order to assure the function of the vacuum brake booster even when the vacuum clutch booster is defective in airtightness. A vacuum system according to the present invention comprises a novel second check valve having an orifice therewithin, being connected between the intake manifold and the vacuum clutch booster. The second check valve operates as an ordinary check valve in a normal condition but as an orifice in an abnormal condition to prevent the vacuum pressure in the system from being decreased quickly, without use of any conventional vacuum tank.

Abstract: A working fluid supply system for a hydraulic power booster and a power steering system includes first and second fluid supply pumps, a hydraulic power boosting apparatus, a power steering unit, various fluid passages connecting thereto and a control apparatus. The first pump supplies pressurized working fluid to a first inlet port of the hydraulic power boosting apparatus. The second pump, controlled by the control apparatus, selectively supplies pressurized working fluid to a second inlet port of the power boosting apparatus to render the fluid supply flow rate applied to the power boosting apparatus substantially constant at a predetermined level when the fluid discharge rate of the first pump is less than the predetermined level. By this, a sufficient amount of pressurized working fluid is supplied to the hydraulic power boosting apparatus to fully operate it under all actual engine speeds.

Abstract: A hydraulic power boost apparatus for use with the braking system of an automotive vehicle includes a power piston cooperating with a slide valve to define a plurality of spool valves to regulate the flow of a pressurized fluid therethrough to selectively apply the fluid to boost the force applied to the power piston. A resilient member is positioned within the power piston blind bore to modulate the force transmitted from the slide valve to the power piston. The power piston also includes an annular ridge for engaging a mating annular ridge of the slide valve to limit the travel of the slide valve to prevent the resilient member from being deformed beyond its elastic limit.

Abstract: A relief valve mechanism for a hydraulic booster provides in an open position a by-pass passage leading to a power steering and relieves excess pressure on the upstream side of the hydraulic booster. The relief valve in the open position forms a second throttle besides a normal fixed orifice to decrease through flow rate to the drain to thereby supply sufficient quantity of oil to the power steering when steering is steeply operated.

Abstract: The disclosed oil pressure booster includes a spool to be actuated as a brake pedal is depressed, which spool has movable parts of a throttle valve, a return path valve and a control valve, and as the spool is moved in a direction of depressing the brake pedal, the throttle valve is at first closed and then the return path valve is closed, and thereafter the control valve starts to open.

Abstract: The spool of the inching valve has first and second lands, a first portion connected to the first land and tapered or suitably formed in such a manner as to gradually increase the flow resistance of the inlet port in accordance with the axial movement of the spool into a position in which the first land fully closes the inlet port, and a second portion connected to the second land and having a reduced uniform diameter or a suitable form which initially temporarily abruptly reduces the flow resistance of the drain port and subsequently gradually reduces the flow resistance thereof in accordance with the axial movement of the spool from a position in which the second land opens the drain port.