Abstract: A container for containing automatic transmissions or the like comprises first and second cases which are identical in shape. A first group of coupling portions are possessed by each case, which establish a coupling of the first and second cases when the first and second cases are mated in a front-to-front mating manner. A second group of coupling portions are possessed by each case, which establish a coupling of the first and second cases when the first and second cases are mated in a back-to-back mating manner. A third group of coupling portions are possessed by each case, which establish a coupling of the first and second cases when the first and second cases are mated in a front-to-back mating manner.

Abstract: A clutch drum in an automatic transmission houses therein a clutch mechanism through which the clutch drum is driven. The clutch drum is rotatably mounted on a fixed shaft forming part of a transmission housing and comprised of a drum main body having a cylindrical drum section which is spaced from and coaxial with the fixed shaft. The drum main body is formed of aluminum alloy. A cylindrical friction material is fixed on the outer peripheral surface of the cylindrical drum section and frictionally contactable with a brake band wrapped around the drum main body. The brake is applied to the clutch drum upon tightening the brake band.

Abstract: A hydraulic control system for an automatic transmission of an automotive vehicle with an exhaust braking unit is provided. This hydraulic control system serves to elevate hydraulic pressure utilized for actuating frictional elements of the automatic transmission during exhaust braking operation toward a preselected level when the pay load of the vehicle is greater than a preselected threshold value for securing tight engagement of the frictional elements without any slippage.

Abstract: The input gear of the secondary gear train is mounted on a hollow input shaft and the reaction element of a planetary gear set is connected with a multi-plate brake and one-way clutch, which are disposed on the opposite side of the input gear with respect to the planetary gear set, by way of a shaft which passes through the hollow input shaft. The multi-plate brake is disposed radially outward of the one-way clutch.The output gear of the gear train is supported by bearings which are disposed on either side thereof. The bearing on the inboard side of the final gear is arranged to have a diameter which is larger than the output gear and supported in a wall portion of the transmission case per se.

Abstract: A speed change control device for an automatic transmission is shown which comprises first, second and third shift valves, each having two switching positions for selectively carrying out application and releasing of hydraulic pressure to and from an oil chamber of a hydraulically operated friction element. First and second solenoid valves are employed each controlling an output of hydraulic pressure in accordance with an electric signal applied thereto. The first solenoid valve outputs a hydraulic pressure for controlling the switching operation of the second shift valve, and the second solenoid valve outputs a hydraulic pressure for controlling the switching operation of the first shift valve. A passage structure is further employed which applies the hydraulic pressure from the second solenoid valve to the third shift valve to control the switching operation of the same only when the second shift valve assumes one given position.

Abstract: There is disclosed a line pressure control for an automatic transmission of an automotive vehicle wherein the automatic transmission is drivingly coupled with the engine and transmits the engine torque by a hydraulically actuable coupling which is actuable by a pressurized hydraulic fluid which is as high as the line pressure. According to this control, a predetermined pattern of variation of the pressurized hydraulic fluid is changed to a second pattern upon detecting the occurrence of a change in an engine load beyond a predetermined degree, and the pressurized hydraulic fluid follows the second pattern temporarily, i.e., for a period of time.

Abstract: A planet-pinion carrier assembly for a planetary gear system includes a planet-pinion carrier having first and second radially extending sections, planet pinions each rotatably mounted onto a pinion shaft through a bearing, a first thrust washer disposed between one axial end of each planet pinion and the first section, and a second thrust washer disposed between the other axial end of each planet pinion and the second section. The first and second thrust washers each have a surface hardness large enough to ensure an improved durability and reliability.

Abstract: An apparatus for operating a lockup clutch to provide a controlled degree of slip between the impeller and the turbine in an automatic transmission. A gear ratio is calculated from a relationship specifying the gear ratio as a function of selected gear change mode and time elapsed after the selected gear change mode starts. The calculated gear ratio is used, along with the transmission output shaft speed to calculate a speed of rotation of the turbine. The lockup clutch is operated in a slip lockup mode to bring a difference between the engine and turbine speeds to a predetermined value. Engine speed changes are monitored to measure a time interval required for the gear change of the selected mode. The relationship is modified to correct the gear ratio stored for the selected gear change mode based upon the measured time interval.

Abstract: A lubricating arrangement for an automatic power transmission has a lubricant circuit for communication between a pressurized fluid source and a component of the automatic power transmission to be lubricated. A flow restriction means is disposed within the lubricating circuit. The flow restriction means incorporated in the lubricating arrangement introduces a twin choke construction for providing sufficient magnitude of flow restriction for the lubricating fluid supplied from the pressurized fluid source for preventing excess fluid from flowing through the lubricating circuit which causes a drop of supply pressure and/or flow rate in the pressurized fluid source and blocking of the fluid flow path due to accumulation of foreign matters, such as dust, dirt and so forth. The flow restriction means comprises a first choke and a second choke arranged in tandem fashion across a fluid reservoir provided therebetween.

Abstract: A control system for a vehicular power plant including an automatic transmission and an exhaust brake. The exhaust brake includes a butterfly valve movably disposed in an exhaust pipe. The control system is comprised of a control unit which is supplied with a signal representative of an engine brake condition and is adapted to generate a signal commanding an automatic downshift of the automatic transmission. Under the operation of the control unit, the exhaust brake is temporarily put into an inoperative condition in response to both the detected engine brake condition and the downshift command.

Abstract: A multiple disc type engaging device which includes a rotatable member having a cylindrical outer surface and a hub with a cylindrical barrel portion coaxially arranged with respect to the cylindrical outer surface. The cylindrical barrel portion has at one end an annular flange which is bent radially inwardly toward the cylindrical outer surface. An outer surface of the cylindrical barrel portion is formed with a plurality of axially extending splines. Annular discs are coaxially disposed about the cylindrical barrel portion and have toothed inner ends axially movably engaged with the splines. A leading end portion of the annular flange is bent back into the interior of the barrel portion and secured to the cylindrical outer surface.

Abstract: A lubricating groove not communicating with other oil passages and extending in the circumferential direction is provided on the side surface of a cam ring. The central portion in the circumferential direction of the lubricating groove is located at the center of the suction side, and both ends of the lubricating groove reach the positions beyond a straight line joinning the upper and lower dead points. As a result, the side surface of the cam ring of the variable-displacement vane pump is prevented from seizing.

Abstract: A control system for an automatic power transmission monitors atmospheric pressure and a throttle valve open angle. The system corrects the monitored throttle valve open angle on the basis of the monitored atmospheric pressure so as to compensate for a drop of engine output torque due to lowering of the atmospheric pressure. The corrected throttle valve open angle is used for performing shift control and/or line pressure control.

Abstract: In an an automatic transmission, a low and reverse brake is arranged radially outward of a high clutch. The gripping plates of the low and reverse brake are arranged axially offset from the high clutch such that a diameter of the transmission is kept small. A piston of the low and reverse brake is associated with the gripping plates by way of arm members having cutout portions therein to allow a sensor, which penetrates the transmission casing in the vicinity of the low and reverse brake, access to a clutch drum of the high clutch so as to sense a rotation speed on an input shaft to which the high clutch is connected.

Abstract: An engine driven auxiliary device consumes engine power and thus reduces the amount of torque supplied to an automatic transmission. In the automatic transmission, a line pressure control and/or a shift control is performed on a predetermined parameter that is employed as reflecting an instantaneous amount of engine torque supplied to the automatic transmission. There occurs a deviation of this predetermined parameter from the actual amount of torque supplied to the automatic transmission when the auxiliary device is in operation. Thus, a sensor output of a throttle opening degree sensor is corrected when the auxiliary device is in operation and then set as the predetermined parameter although the sensor output unaltered is set as the predetermined parameter when the auxiliary device is not in operation.

Abstract: In order to reduce a select shock of an automatic transmission, a measure is employed, which comprises a first device for detecting the selection of a drive range from a neutral range; a second device for detecting the starting of engaging movement of a hydraulically operated friction element for the drive range; a third device for controlling a hydraulic pressure applied to the friction element; a fourth device for causing the third device to raise the hydraulic pressure to a higher level from the time when the range selection is carried out to the time when the second device detects the starting of engaging movement and lower the hydraulic pressure to a lower level after the detection by the second device; a fifth device for producing an instruction signal when a predetermined time passes after the drive range detection by the first device; and a sixth device for causing the third device to lower the hydraulic pressure to the lower level upon issuance of the instruction signal irrespective of any detection

Abstract: A hydraulic frictional device disclosed herein is a multiple plate clutch or brake. The device includes a set of interleaved friction plates including a plurality of driving plates and a plurality of driven plates. In order for increased dissipation of heat from the friction plates, some of the interleaved friction plates has radially extending through passages for a hydraulic fluid to pass therethrough.

Abstract: An existing maximum engine speed during the upshift of a transmission at the time when the engine load is higher than a predetermined level is detected. The existing maximum engine speed is compared with a reference maximum engine speed to correct an engine speed based upshift characteristic line.

Abstract: An exhaust braking control apparatus for use with an automotive vehicle having an engine and an automatic transmission. The exhaust braking control apparatus includes a control valve situated for movement within an engine exhaust passage to control exhaust gas flow from the engine to the atmosphere. A control unit is provided to produce an engine braking command signal when the automatic transmission is in low gear for engine braking. In the presence of the engine braking command signal, the control valve moves in a closing direction to provide an engine braking effect. The control unit includes an inhibit circuit arranged to interrupt the engine braking command signal during a gear change produced in the automatic transmission from a higher gear to a lower gear. Such a change down is produced when the vehicle speed is less than a reference value. In the event of failure of the inhibit circuit, the reference value is changed to a smaller value.

Abstract: The input gear of the secondary gear train is mounted on a hollow input shaft and the reaction element of a planetary gear set is connected with a multi-plate brake and one-way clutch, which are both disposed on the opposite side of the input gear with respect to the planetary gear set, by way of a shaft which passes through the hollow input shaft. The multi-plate brake is disposed radially outward of the one-way clutch.The output gear of the gear train is supported by bearings which are disposed on either side thereof. The bearing on inboard side of the final gear is arranged to have a diameter which is larger than the output gear and supported in a wall portion of the transmission case per se.