Aisin Aw Co., Ltd.

Aisin-warner Limited

Toyota Jidosha Kabushiki Kaisha

Toyota Motor Corporation

Chihiro Hosono

Masaaki Nishida

Yoichi Hayakawa

Youichi Hayakawa

Kozo Kato

Yutaka Taga

Seitoku Kubo

Takeshi Inuzuka

Shinya Nakamura

Kazuhisa Ozaki

Yoshiharu Harada

Kazuaki Watanabe

Michimasa Tanaka

Yasuhito Ogasawara

Katsuya Kikuchi

Kazuhisa Murase

Makoto Shimanaga

A range switching device is provided that is capable of selecting a running range accurately using a simple configuration and control. The range switching device includes a conversion mechanism which, in turn, includes a ball screw shaft, a ball nut, and other members. The ball nut is connected to a spool through an arm member, a range control shaft, and a detent lever. The spool is moved into a specified selection region among a plurality of selection regions by the conversion mechanism and the arm member. Then, the spool is more precisely moved to a selection position within the specified selection region by the detent mechanism and positioned and held thereat.

Vehicle running range switching device

Nested piston hydraulic operator for automatic transmission

Automatic transmission

Automatic transmission with hydraulic operator having nested drums

A hydraulic actuator has a hub, an annular recessed groove on the inner peripheral surface of the hub and an oil chamber, from which a slanted oil channel is pierced to the bottom of the recessed groove. Accordingly, there is no need for the slanted oil channel to extend to the inner peripheral surface of the hub, by which the slanted oil channel can save its length. The oil is sent from the supply oil channel formed in the boss section to the annular recessed groove of the hub in slidable contact with the boss section, and to the oil chamber through the slanted oil channel.

Oil channel structure in automatic transmission

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

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

A carrier is provided with a flange-shaped carrier cover directly secured to a pinion shaft which supports a pinion, and the carrier cover is integrally formed to a countershaft by heat forging. The carrier cover is formed with a lubricant oil hole extending from the countershaft toward the pinion shaft, and the countershaft is formed with a small diameter on the side bounded by the carrier cover where the planetary gear unit is positioned, and with a large diameter on the opposite side. As a result, the countershaft has a high degree of strength and forms a compact gear unit in the axial direction. Lubricant is supplied from a lubricant oil hole in the center of the shaft to a lubricant oil hole formed in the carrier cover, and is forcedly fed to the support surface of the pinion through oil holes in the pinion shaft. The axial force from the counterdriven gear is applied to a thrust bearing between the hub and the carrier cover, and the axial force is backed up by the large diameter section of the shaft.

Carrier device in an automatic transmission

A stator shaft is press-fitted and secured to the inner peripheral surface of a pump cover positioned between a torque converter and a automatic transmission mechanism section. Bushings are fitted to a part opposing the press-fit section with reference to the outer peripheral surface of an input shaft fabricated with a uniform diameter with the exception of the rear end part, and to a part slightly forward of the above-mentioned part, respectively, and an oil channel for the torque converter feed pressure is formed between the two bushings. As a result, the forward end section of the input shaft is supported in a freely rotatable manner by the bushings which are relatively close to each other. The torque converter feed pressure is fed from an oil channel formed in the pump cover to an oil channel between the two bushings, and through the cross hole and the center hole formed in the input shaft to the torque converter. The stator shaft is press-fitted into the pump cover and secured to it, and back-up is provided to the press-fit section by bushings.

Automatic transmission with stator shaft mounting structure

A thrust washer has a protrusion which is formed with a projecting pawl. The rotating member is formed with a through hole, into which the protrusion of the thrust washer is inserted, such that the pawl is projected out on the opposed surface remote from the thrust washer of the rotating member, whereby the upstanding surface of the pawl is used as a stop means. Thus, the thrust washer is positively secured to the rotating member.

Thrust washer mounting apparatus

In an automatic transmission provided with an automatic transmission mechanism section with a planetary gear unit and a torque converter, a snap ring groove is defined by an annular flange section for a stator shaft and a pump cover, and the reaction from a return spring is borne in the annular flange section. A stator shaft, which bears the stator reaction of a torque converter, is engagingly secured in a center hole section of an oil pump assembly, an annular flange section projecting to the radially outer side is formed at one end of the stator shaft, the snap ring groove is defined from the annular flange section and an annular recessed section of the oil pump assembly to receive the snap ring, and a receiving member for the return spring of the hydraulic actuator is maintained by the snap ring installed in the snap ring groove. Consequently, the return spring, which applies the return force to the piston of the hydraulic actuator, has its reaction force borne at the annular flange section of the stator shaft through the receiving member and the snap ring.

Snap ring support device for an automatic transmission

In a clutch mechanism for a power transmission system which effects engagement and disengagement between a central shaft and an outer peripheral shaft provided on the outer periphery of the central shaft, an improvement characterized by comprising splines provided on the outer periphery of the central shaft, and an inner tube of an annular clutch cylinder containing a piston of a fluid actuator and a clutch plate of a multiple disk clutch, the inner tube being fitted on the outer periphery of the central shaft through the splines.

Power transmission

A control system for a 4-wheel drive transmission including a main transmission and an auxiliary transmission shiftable by operation of a hydraulic clutch for switching the mode of operation either to 2-wheel drive or 4-wheel drive including a manual changeover valve mechanically connected to a shift lever in a passenger's room of a vehicle for operating the hydraulic clutch according to the mode selected by the shift lever.

Growing community of inventors

Anjo, Japan

Chihiro Hosono