摘要:
A hydraulic control device for use with an automatic speed change gear device for a diesel engine using a torque convertor and an auxiliary speed change gear device. This hydraulic control device is provided with a back pressure control valve controlled by means of a throttle pressure developed in response to a throttle opening, wherein when the throttle opening is smaller than a given opening, a pressure oil having a pressure lower than a line pressure is introduced to an accumulator, and when the throttle opening is greater than the aforesaid given opening, a pressure oil having the same pressure level as that of said line pressure is fed to said accumulator to thereby obtain a desired engaging pressure for said automatic speed change gear device, thus effectively preventing a shock due to a change in speed. This device may also be used with a gasoline engine.
摘要:
An oil pressure control system for an automatic transmission system which includes a fluid torque converter, a transmission gear and friction engaging means adapted to be selectively supplied with line pressure for establishing a selected transmission engagement in said transmission gear, said friction engaging means being provided with a buffering accumulator which buffers its operating pressure, said accumulator comprising a fluid displacing element which is selectively supplied with different levels of oil pressure, preferably a torque converter pressure or a line pressure as a back pressure according to the operational condition of the oil pressure control system.
摘要:
A fluid pressure control system for automatic power transmissions including a source of fluid providing a controlled line pressure, a manual valve movable to a number of positions including range P (parking), range R (reverse), range N (neutral), range "3", range "2" and range "1" in the order mentioned for setting the transmission in a desired operational range and provided with at least three spaced lands. A unitary, first pressure regulator valve is provided which has at least two spaced valve lands and a fluid passage interconnecting the unitary, first pressure regulator valve and the manual valve. The fluid passage communicates with a fluid chamber provided between the valve lands of the unitary first pressure regulator valve. In the range P, one of the valve lands of the manual valve is adapted to cut the line pressure. In the range R, the aforementioned fluid passage is blocked by another of the valve lands of the manual valve. The fluid passage communicates with a fluid chamber provided between valve lands of the manual valve in the ranges of N, D, "3", "2" and "1".
摘要:
An oil seal member is compressed between a connecting pipe for supplying oil to an oil chamber of a hydraulic servo and the cylinder drum of the hydraulic servo. The cylinder drum has an interior oil chamber and turns through a predetermined angle upon operation of a frictional engagement element by the hydraulic servo. The end of the seal member pressed against the cylindrical drum surrounds an oil hole 73 formed in the cylindrical drum, and oil pressure is supplied to the oil chamber through an oil passage in which the seal member is mounted and through the oil hole. A recess is formed in the outer surface of the cylindrical drum around the oil hole and the end of the seal member is received in the recess. When the cylindrical member turns within the predetermined angular range, the end of the seal member is protected by the recess. As a result, the end of the seal member is not damaged and the integrity of the seal is protected.
摘要:
An oil temperature responsive hydraulic control system for an automatic transmission includes a hydraulic servo for applying/releasing a frictional engagement element; a pressure regulator valve for regulating oil pressure fed to the hydraulic servo; and a signal pressure oil passage for applying a pressure regulating signal pressure to the pressure regulator valve. A control valve is arranged in the signal pressure oil passage for changing the effective diameter of the signal pressure oil passage responsive to change in oil temperature.
摘要:
A shift control apparatus for an automatic transmission including a gear train having a plurality of one-way clutches having their engagement states switched in accordance with torque applying directions and a plurality of frictional engagement units adapted to be engaged by oil pressures. The apparatus comprises a controller for engaging a first one of the frictional engagement units so as to maintain a predetermined gear stage after any of the one-way clutches has been engaged or released, if a predetermined condition is satisfied after the one-way clutch has been engaged or released to start a shift to the predetermined gear stage.
摘要:
A transmission control device according to the present invention comprises a main transmission having a torque converting device provided with a direct clutch for effecting engagement and disengagement of the input member with output member of a torque converting portion; a sub transmission having a speed change mechanism; a drive-mode detecting means for detecting the drive mode of the speed change mechanism of the sub transmission; and a controller for controlling the lock-up characteristics of the direct clutch by means of the output of the drive mode detecting means.The transmission control device is capable of setting the lock-up characteristics of the direct clutch in accordance with the speed mode of the sub transmission by effecting a change-over of the lock-up characteristics of the direct clutch of the torque converting device on the basis of the output of the drive-mode detecting means for detecting the speed mode of the sub transmission, so that it is possible to optimize the power performance, operating performance, and fuel consumption in accordance with the speed mode of the sub transmission.
摘要:
A lubricating system for a transmission of the kind having a driving shaft driven to rotate, a transmission shaft disposed parallel to the driving shaft, a chain for transmitting power from the driving shaft to the transmission shaft and a chain case enclosing the chain, the lubricating system comprising a chain chamber and an oil reservoir chamber in the chain case, the oil reservoir chamber having an upper inlet port for receiving oil from the chain chamber, at least some of the oil in the chain chamber being driven to reach the inlet port by movement of the chain, and the oil reservoir chamber having a lower outlet port for returning oil to the chain chamber, whereby oil flowing through the oil reservoir chamber may be cooled and the amount of oil in the chain chamber subject to agitation by the chain movement at any one time may be reduced, substantially prolonging the operational life of the lubricating oil. When the transmission is further provided with a support part for the transmission shaft and a rotatable bearing assembly disposed between the support part and the transmission shaft, the lubricating system may further comprise the support part having a passage therein forming part of a flow path along which oil moves from an upper part of the oil reservoir to a lower part of the oil reservoir, the rotatable bearing assembly being disposed adjacent one end of the passage, whereby the rotatable bearing assembly is continuously lubricated by oil flowing through the oil reservoir.
摘要:
A running stability controller is activated upon the instability of a vehicle and controls at least one of an output of an engine, a braking force applied to the vehicle and a gear ratio of an automatic transmission. A manual shifting controller which shifts the automatic transmission according to an operation of a manual shifter is provided. A running stability control detector detects the activation of the running stability controller. A manual shifting control inhibitor operates upon detection of the activation of the running stability controller, and inhibits an operation of the manual shifting controller while the running stability controller is activated.
摘要:
A clutch slip control device includes: a slip revolution speed detecting circuit for detecting an actual slip revolution speed of a clutch; a memory unit for storing constants set to satisfy response and stability of a feedback control system of the slip conditions, the constants being determined by a high-order function approximating variation in input-output frequency characteristics of a plant input for actuating the clutch and the actual slip revolution speed; a first calculation circuit for calculating a first parameter using the constants stored in the memory unit, the first parameter discretely reflecting past data of the plant input, which are obtained in a current feedback control cycle through in a cycle executed a plurality of times before; a second calculation circuit for calculating a second parameter using the constants stored in the memory unit, the second parameter discretely reflecting past data of a deviation of the actual slip revolution speed from a target slip revolution speed, which are obtained in the current feedback control cycle through in the cycle executed a plurality of times before; and a plant input determination circuit for determining a next plant input based on the first parameter and the second parameter.