Aisin-warner Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Aisin-warner Limited

Aisin Aw Co., Ltd.

Toyota Motor Corporation

Aisin Aw Kabushiki Kaisha

Fuji Medical Instruments Mfg. Co., Ltd.

Toyota Jidosha Kabushiki

Yoichi Hayakawa

Yoshiharu Harada

Masao Kawai

Yutaka Taga

Kagenori Fukumura

Seiichi Nishikawa

Chihiro Hosono

Kazuaki Watanabe

Masaaki Nishida

Yasunobu Ito

Shinya Nakamura

Kozo Kato

Yoshinari Kuwayama

Kaiya Fujiura

Shuzo Moroto

Masahiko Ando

Kenichi Yoshizawa

Goichi Matsumoto

Seitoku Kubo

Shiro Sakakibara

Shoji Yokoyama

Takahiro Sakai

Hideyuki Aoki

Takahiro Yamashita

Naoji Kato

Jiro Nishiwaki

Tamotu Kobatake

Katsuya Kikuchi

A double-acting hydraulic actuator structure for use in an automatic transmission has a two-layered structure which includes first and second frictional engagement element hydraulic actuators. The first hydraulic actuator includes a drum member and a first piston fitted hermetically and slidably in the drum member. The second hydraulic actuator is formed by the interior of the first piston and a second piston fitted hermetically and slidably mounted within the first piston. The first and second pistons are both urged toward their disengaged positions by the action of a common return spring. A second spring is provided for urging the second piston alone against the force of the return spring.

Hydraulic actuator in automatic transmission

Nested piston hydraulic operator for automatic transmission

Automatic transmission

Automatic transmission with hydraulic operator having nested drums

A sealing device has a torque converter housing, a transmission case, an oil pump disposed between the torque converter housing and the transmission case, an oil sealing member disposed between the oil pump and the pump impeller of the torque converter, and seal ring disposed between the oil pump and the torque converter. The oil pump has a protrution extending to the torque converter. The sealing member is disposed between the outer periphery of the protrusion and a flange of the torque converter housing. The seal ring is disposed between the protrusion and the pump impeller hub.

Sealing device of an automatic transmission

An automatic transmission has a rotational shaft with an axial through-hole. The shaft is supported by a case through bearings at opposite ends thereof. In the hole, a cup-type plug with holes is engaged with the shaft at one end thereof. A lubricating means is disposed in the case facing the holes for distributing a lubricating hydraulic fluid to bearings disposed at each end of the shaft.

Lubricating device of automatic transmission

A oil strainer device for an automatic transmission has an oil strainer with an oil suction, an oil supplying port, and an oil strainer, an opening portion formed in the transmission case, and a cover mounted on an opening portion for holding the strainer. The strainer has a meshed filter and a filter supporting plate with ribs forming lattice and is arc-shaped in cross section.

Oil strainer device of an automatic transmission

An accumulator fluid control system for a hydraulic servo in a vehicular automatic transmission includes an accumulator having a cylinder, a piston, a return spring, a chamber disposed in the cylinder, a first and second input ports connected to a first passage, an output port connected to a second passage, and a check valve for controlling the connection between the first and second passages through the second input port.

Accumulator device of hydraulic fluid control system

An automatic transmission hydraulic controller having a multiplicity of hydraulic servos for respectively controlling a multiplicity of frictional engagement elements. A hydraulic pressure to be supplied to the hydraulic servos is applied to accumulator chambers of a multiplicity of accumulators. A line pressure to be supplied to the hydraulic servos is produced by a primary regulator valve and an engine output pressure control valve is controlled by an electrical signal from a control section to produce a hydraulic pressure corresponding to the engine output. Each of at least two particular ones of the multiplicity of accumulators has a back pressure chamber formed at the rear of a piston. The pressure receiving area of this back pressure chamber and that of the corresponding accumulator chamber are substantially equal to each other. Only one of the frictional engagement elements operated by the hydraulic servos communicating with the particular accumulators is changed over from a released state to an engaged state while the other frictional engagement elements are not changed over from a released state to an engaged state, when the transmission is shifted to a predetermined speed. There is no substantial influence of a change in the line pressure upon the operating state of the other frictional engagement elements.

Hydraulic controller for an automatic transmission

A hydraulic controller for an automatic transmission, having a band brake having a large stopping force based on a self-boosting effect against rotation in a self-binding direction and having a comparatively small stopping force against rotation in the unbinding direction, a modulator valve for producing a modulator pressure by reducing a line pressure, a band brake hydraulic servo having a brake engaging hydraulic chamber and a brake releasing hydraulic chamber. A line pressure is supplied to the band brake hydraulic servo to stop rotation in the self binding direction when a predetermined transmission speed is selected. The line pressure is also supplied the band brake hydraulic servo to stop rotation in the unbinding direction when another transmission speed is selected. A modulator pressure is supplied to the brake engaging hydraulic chamber to stop the rotation in the self-binding direction of the band brake and to allow the rotation in the unbinding direction when an intermediate speed is selected. The risk of any shift from the predetermined speed to another speed via the intermediate speed is eliminated, thereby enabling the transmission to be shifted always correctly while reducing shift shocks.

A transmission control system for controlling a transmission. The system has a main transmission with a speed changing mechanism and an output shaft, a substransmission connected to the output shaft, and a control system for receiving outputs from a number of sensors which sense the running state of the vehicle. The control system itself has two outputs, there being two separate hydraulic controls connected to the two system outputs, respectively. The two hydraulic controls control the speed changing mechanisms of the main and subtransmissions, respectively. Also provided is a hydraulic pressure source which supplies a working fluid to the two hydraulic controls. The control system determines whether the main and subtransmissions are in a transient period of the speed changing operation and, as long as one of the two transmissions is in the transient period, inhibits the speed changing operation of the other transmission.

Transmission control system

A lubrication system is provided for a transmission mechanism supported on input and output shafts, and a chain drive rotatably connects these shafts. The chain and drive elements on the shafts are provided with a casing for isolating the mechanism, which collects an oil bath within the bottom of the transmission casing for lubricating a chain or other transmission member. An oil pump supplies oil from a reservoir to various areas to be specifically lubricated within the transmission. Feed means associated with the oil pump regulates the level of the transmission oil bath. The system may additionally contain an oil strainer, an external cooler, a relief valve to limit the pressure from the oil pump, or various combinations of such elements. The various points of lubrication within the casing, in turn, drain into the casing. Oil level within the transmission casing is regulated to keep the level low and at the same time to maintain sufficient oil for lubricating the chain.

Lubricating structure for transmission mechanism

A device for supplying lubricating oil in a transmission mechanism, the transmission mechanism comprising: an input shaft; an output shaft disposed parallel to the input shaft; a first rotary body provided on the input shaft; a second rotary body provided on the output shaft; a transmission member for interlocking the first rotary body with the second rotary body; and, a transmission mechanism case forming a transmission mechanism chamber separated from the exterior for housing the transmission mechanism; and, the lubricating oil supply device comprising: a partition wall assembly with an opening disposed in the transmission mechanism case chamber and defining an oil chamber to contain the lubricating oil scattered by the rotation of the transmission mechanism through the opening; and, a lubricating oil supply passage connected to the oil chamber to supply the transmission mechanism with lubricating oil, the passage being disposed at a level lower than the opening, whereby oil scattered by operation of the transmission mechanism is collected in the oil chamber and supplied to the transmission member through the passage whenever the oil in the oil chamber is at a level higher than the passage.

Lubricating oil supply device for transmission mechanism

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.

Apparatus for controlling lock-up clutch in automatic transmission

A hydraulic control system for a four-wheel drive torque transfer mechanism for a vehicle, including an automatic transmission, a transfer mechanism having gear positions of a two-wheel drive direct-coupling mode H.sub.2, a four-wheel drive direct-coupling mode H.sub.4 and a reduced-speed four-wheel drive mode L.sub.4, and a hydraulic control circuit for controlling the transmission and the transfer mechanism. The transfer mechanism includes a reduction gear mechanism, a first output shaft, a second output shaft rotationally connectible to the first output shaft through a link mechanism, a four-wheel drive clutch for releasably coupling the first and second output shafts, a direct-coupling clutch for releasably coupling an input shaft of the reduction gear mechanism with the first output shaft, and a reduction brake for setting the reducing gear mechanism in a gear train of the reduced-speed mode. The hydraulic control circuit includes an inhibitor valve which is supplied with governor pressure and which selectively applies pressurized fluid to one of the servomotors of the direct-coupling clutch and reduction brake while draining the other servomotor, the inhibitor valve feeding pressurized fluid continuedly to the servomotor of the direct-coupling clutch if manual shift of the transfer mechanism selects the mode L.sub.4 when the governor pressure is higher than a predetermined level, and instead feeding pressurized fluid to the servomotor of the reduction brake and draining the servomotor of the direct-coupling clutch when the governor pressure drops below the predetermined level.

Hydraulic control system for four-wheel drive torque transfer mechanism

Growing community of inventors

Toyoake, Japan

Yoichi Hayakawa