Abstract: A hydraulic control system for an automatic transmission. The hydraulic control system is applied to an automatic transmission adapted to vary a torque capacity of a transmission member by an actuator. The hydraulic control system includes: a discharging device configured to discharge compressible gas entrained in the hydraulic fluid in the actuator; an interrupting device that interrupts power transmission; and a controller configured to determine an entrainment of the compressible gas in the hydraulic fluid, disconnect the power transmission via the interrupting device in a case that an entrained compressible gas is determined, and cause the entrained compressible gas to be removed from the hydraulic fluid by rotating the actuator while interrupting the power transmission.

Abstract: A hydraulic pressure control device for a transmission, the hydraulic pressure control device configured to operate a prescribed hydraulic apparatus by hydraulic pressure generated by an oil pump to be driven during operation of a driving force source, for which automatic stop control is performed according to at least one of a vehicle speed and a request drive amount, to accumulate the hydraulic pressure in a pressure accumulator, and to supply the hydraulic pressure accumulated in the pressure accumulator to the hydraulic apparatus when the driving force source is automatically stopped, wherein: the automatic stop control includes control to stop the driving force source during travel in which the vehicle speed is equal to or higher than a prescribed vehicle speed; and the hydraulic pressure control device is configured to perform a pressure accumulation control to control an accumulated oil amount in the pressure accumulator and the automatic stop control in a cooperative manner so as to increase the accum

Abstract: In a seal device for a hydraulic circuit, in which an oil passage that supplies hydraulic oil to or discharges the hydraulic oil from a hydraulic actuator operated by hydraulic pressure is formed over at least two members that relatively move, and a seal member that seals a gap between the two members in a liquid-tight manner is disposed in an interior of a groove section that is formed in at least either one of the two members, a communication section that allows the groove section to communicate with any portion of the oil passage such that the hydraulic oil in the interior of the groove section moves along with supply of the hydraulic oil to or discharge of the hydraulic oil from the hydraulic actuator is formed.

Abstract: A switch valve which is configured such that a plurality of land sections and a valley section between the land sections are formed in a valve element that advances or retreats in an axial direction according to a manual operation, a plurality of port sections opened are provided in a cylinder section in which the valve element is inserted so as to be capable of advancing and retreating, and the prescribed port sections are made to communicate with each other via the valley section according to a position of the valve element in the axial direction or be blocked by the land section, the switch valve includes a seal section that seals a space between portions on both sides in the axial direction across either one of the land sections in a liquid-tight manner.

Abstract: A driving belt comprising plate elements juxtaposed in its thickness direction and a flat ring fastening the elements annularly. The elements includes at least one adjuster element configured to adjust an endplay as a total of clearances between the adjacent elements in the elements fastened annularly by the ring. The adjuster element comprises an insertion groove opening toward the endplay, and an inserting member inserted into the insertion groove and configured to protrude partially from the insertion groove thereby adjusting the endplay.

Abstract: A sealing structure capable of reducing oil leakage while preventing the oil from being deteriorated by a temperature rise of the oil. The sealing structure is configured to seal a clearance between two members tightly by a seal ring interposed therebetween. The seal ring is provided with a slidable structure, which is configured to seal the clearance between the two members by a hydraulic pressure applied thereto, and to unseal the clearance between the two members by a relative movement thereof resulting from a thermal expansion thereof.

Abstract: A belt-driven continuously variable transmission adapted to prevent a tilting motion of a sheave under high temperature. The belt-driven continuously variable transmission is comprised of a pair of pulleys individually comprised of a fixed sheave rotated integrally with a rotary shaft and a movable sheave fitted onto the rotary shaft while being allowed to reciprocate thereon, and a driving belt applied to the pulleys to transmit power therebetween. a stopper member is disposed on an outer circumferential side and in a side where the driving belt is not contacted with the movable sheave so as to prevent the movable sheave from being tilted to widen a width between the fixed sheave and the movable sheave holding the driving belt by a load from the driving belt.

Abstract: A vehicle control device includes an engine that is a power source of a vehicle, a transmission configured to connect the engine to a drive wheel of the vehicle, and a clutch configured to connect or block transmission of power between the engine and the drive wheel through the transmission. The vehicle control device is capable of executing predetermined control to allow the vehicle to travel while stopping supplying fuel to the engine and releasing the clutch that has been engaged, during travel of the vehicle, and the vehicle control device downshifts the transmission at the time the clutch is released in the predetermined control. It is possible to shift the transmission into a lowest-speed side gear ratio by the downshift.

Abstract: A hydraulic circuit and a hydraulic control system for preventing fluid leakage and power loss resulting from jamming of contaminants. A first circuit section has an accumulator for storing hydraulic pressure, and a control valve for controlling a passage for delivering fluid from the accumulator to an actuator. Fluid discharged from an oil pump is delivered continuously to a second circuit section. A first filter is disposed on a passage for delivering the fluid from the oil pump to the accumulator for the purpose of removing contaminants finer than those in the fluid to be delivered to the second circuit section from the fluid to be delivered to the accumulator.

Abstract: A hydraulic control system for an automatic transmission can improve a response and a controllability of the automatic transmission without increasing actuation frequency of the automatic transmission. The hydraulic control system is applied to an automatic transmission adapted to vary a torque capacity of a transmission member by an actuator. The hydraulic control system includes: a discharging device that discharges compressible gas entrained in the hydraulic fluid in the actuator; an interrupting device that interrupts power transmission; an entrainment determining device that determines an entrainment of the compressible gas in the hydraulic fluid; a disconnecting device that disconnects the power transmission by the interrupting device in case an entrained compressible gas is determined; and a discharging device that removes the entrained compressible gas from the hydraulic fluid by rotating the actuator while interrupting the power transmission.

Abstract: In a lubricating device, as a clutch engagement pressure increases, the degree of opening of a flow rate adjusting valve is mechanically increased. Thus, as the clutch engagement pressure increases, the flow rate of an oil sucked from an oil pan to a suction portion of a jet pump is increased. Therefore, as the clutch engagement pressure increases, the flow rate of the oil ejected from an ejection portion of the jet pump is increased. That is, as the clutch engagement pressure increases, the flow rate of the oil for lubricating a lubrication portion of a friction clutch is increased. Accordingly, even if a torque/oil flow rate conversion mechanism, for example, a torque sensor is not used, the flow rate of the oil ejected from the jet pump can be changed only by a flow rate adjusting valve.

Abstract: A hydraulic control system comprises: a regulator valve, which regulates a fluid pressure established by an oil pump to an operating pressure required in a control circuit; a signal pressure establishing valve, which applies a signal pressure to the regulator valve to determine a level of the fluid pressure to be established by the regulator valve; and an accumulator, which accumulates the operating pressure to be applied to the control circuit.

Abstract: A hydraulic control system adapted to carry out a speed change in case of rotating a wrapping transmission under the situation where solenoid valves for controlling a pressure in a hydraulic chamber cannot be energized. A pair of pulleys individually provided with hydraulic chambers to vary a width of a groove holding a belt. Those hydraulic chambers are connected with a hydraulic source through electrically controlled feeding control valves, and also connected with drain portions through electrically controlled relief control valves. The hydraulic control system includes a communicating passage connecting the hydraulic chambers, and the hydraulic control system disconnects the hydraulic chambers from the hydraulic source and the drain portions in case none of the feeding control valves and the relief control valves can be energized.

Abstract: A hydraulic control unit provided with oil pumps includes a first oil discharging outlet and a second oil discharging outlet, a high pressure route connected with the first oil discharging outlet, a medium pressure route with an oil pressure therein being lower than that in the high pressure route, a low pressure route with an oil pressure therein being lower than that in the medium pressure route, and a connection mode switching mechanism for selectively connecting a second oil discharging outlet with the high pressure route, the medium pressure route or the low pressure route. The connection mode switching mechanism includes a changeover valve selectively connecting the second oil discharging outlet with the medium pressure route or the low pressure route; and a changeover valve controlling device connecting the second oil discharging outlet with any of the medium pressure route and the low pressure route. The hydraulic control unit can minimize drive loss of an oil pump.

Abstract: An endless metal belt including a ring formed by laminating endless metal plates; and multiple elements continuously attached to the ring. Each of the elements has a body, a head connected to the body by a pillar, and slots formed between the body and the head on left and right sides of the pillar, respectively, for receiving the ring. The elements satisfy the equations (h/t)<1 and (S/h)>40, where h is a width of the slots, t is a plate thickness of the elements, and S is an area of the head.

Abstract: A shift controller for an automatic transmission mechanism is configured such that when the engine is in a driven state in which the engine is driven by a travel inertia force or the like and an accumulated pressure amount of the accumulator is equal to or less than a predetermined threshold, the excessive engine brake force, which is generated due to the accumulation of at least a portion of the hydraulic pressure generated from the mechanical hydraulic pump in the accumulator, is inhibited or reduced by conducting upshifting that relatively decreases the gear ratio of the automatic transmission mechanism. Therefore, the generation of the excessive engine brake force can be inhibited or reduced even when the engine is in the driven state and pressure accumulation is performed.

Abstract: In a fluid coupling wherein a turbine shell is welded to a turbine hub, it is necessary to take care of the strength of the welded portion because the turbine shell is displaced toward the pump blade as the torque thereof is transmitted. A fluid coupling (10) according to the present invention is provided with an input-side rotary constituent (A) including a pump blade (18), to which is attached an input member, and an output-side rotary constituent (B) including a turbine shell (22), to which is attached a turbine blade (21) opposed to the pump blade (18), and a turbine hub, to which is coupled an output member (1), the turbine hub (15) being welded to an inner peripheral portion of the turbine shell (22), wherein the turbine shell (22) and the turbine hub (15) have contact surfaces (23, 24), respectively, extending along a rotational axis (10a) of the fluid coupling (10), and a joint portion (14) is formed by the welding on the contact surfaces (23, 24) closer to the pump blade (18).

Abstract: To provide a lubricating device which can be made compact. In a lubricating device 1-1, as a clutch engagement pressure increases, the degree of opening of a flow rate adjusting valve 13 is mechanically increased. Thus, as the clutch engagement pressure increases, the flow rate of an oil sucked from an oil pan 12 to a suction portion 11b of a jet pump 11 is increased. Therefore, as the clutch engagement pressure increases, the flow rate of the oil ejected from an ejection portion 11d of the jet pump 11 is increased. That is, as the clutch engagement pressure increases, the flow rate of the oil for lubricating a lubrication portion 20a of a friction clutch 20 is increased. Accordingly, even if a torque/oil flow rate conversion mechanism, for example, a torque sensor is not used, the flow rate of the oil ejected from the jet pump 11 can be changed only by a flow rate adjusting valve 13. With the configuration, the device can be made compact.

Abstract: If it is determined that a malfunction has occurred in an electrical hydraulic pump and the hydraulic fluid is not supplied to a high hydraulic pressure supplied portion from the electrical hydraulic pump, the hydraulic fluid is supplied to the high hydraulic pressure supplied portion from a mechanical hydraulic pump that usually supplies the hydraulic fluid to a low hydraulic pressure supplied portion. In this case, the hydraulic pressure that is generated by the mechanical hydraulic pump is increased by increasing the output from the engine that drives the mechanical hydraulic pump.

Abstract: An endless belt for power transmission is capable of efficiently improving the yawing attitude of the elements in a variable pulley. This endless belt for power transmission includes the elements and an annular band-like member for supporting the elements. The endless belt is winched between a pair of variable pulleys. Groove parts extending from the front surface of the belt in the forward movement direction to a predetermined position not reaching to the rear surface of the belt in the forward movement direction are formed in the side surfaces of the elements contacting with the belt sliding surfaces of the variable pulleys.