Toyota Jidosha Kabushiki Kaisha

Other

Aisin Aw Co., Ltd.

Yoshihiro Iijima

Naoyuki Fukaya

Terufumi Miyazaki

Masahiro Itou

Mikio Iwase

Hiromichi Kimura

Yukihiko Ideshio

Yasuo Hojo

Hideaki Komada

Yuji Yasuda

Atsushi Tabata

Kazuhisa Ozaki

Akira Hoshino

Kazuyuki Watanabe

Tokuyuki Takahashi

Koichi Tanaka

Hideaki Ogasawara

Miyoshi Kawaguchi

Shigeki Hiramatsu

Seitoku Kubo

Kazunori Ishikawa

Kagenori Fukumura

Daisuke Inoue

Takaji Umeno

Takashi Ohta

Takeshi Kitahata

Shigeki Takami

Hideki Miyata

Hirofumi Onishi

Fuminori Suzuki

Yasunari Nakamura

Kojiro Kuramochi

Makoto Iwanaka

Haruki Yamamoto

Keizo Kobayashi

Takenori Kanou

Mikio Mori

Norihiro Kitamura

Hidetoshi Aoki

Kohjiroh Kuramochi

Naohiro Imamura

Terufumi Miyazakii

In an electromagnetic actuator, an electromagnetic drive section forms a flux path between a plunger and an inner yoke, each member being made of magnetic material, and which drives the plunger in an axial direction through electromagnetic force, an operation section has a dog movable between a connection position where it is connected with a mating part and a release position where it is apart from the mating part in the axial direction, and which restrains movement of the mating part in a circumferential direction when the dog is at the connection position, and a retaining ring is interposed between the plunger and the dog such that relative movement of the dog to the plunger in the circumferential direction is permitted and relative movement of the dog to the plunger in the axial direction is restricted.

Electromagnetic actuator

A hybrid drive unit includes a power distribution mechanism for distributing a power from an engine to a first electric motor and to an output shaft; a transmission, which is arranged between the output shaft and a second electric motor in a manner to transmit a torque therebetween, and which is capable of setting an overdrive ratio where a speed of the output shaft is higher than that of a predetermined input element; and an engagement mechanism for connecting the engine selectively with the input element of the transmission, and for setting a speed change ratio of the transmission to the overdrive ratio. The hybrid drive unit is capable of setting an overdrive mode and is easy to be downsized.

Hybrid drive unit

A hybrid drive unit that includes an input shaft connected to an engine; an output shaft connected to wheels; a first rotary electric machine; a second rotary electric machine connected to the output shaft; a power distribution device that distributes a rotational driving force of the input shaft to the output shaft and to the first rotary electric machine; a second rotary electric machine fixing device that selectively fixes a rotor of the second rotary electric machine; and a transmission cutoff device capable of cutting off transmission of rotation between the output shaft and the second rotary electric machine at least in a state when the rotor of the second rotary electric machine is fixed.

Drive apparatus

A cylinder tube of a second hydraulic cylinder is provided separate from a first piston of a first hydraulic cylinder and integrally fixed to an input shaft. Friction members of a first clutch and friction members of a second clutch are prevented from moving in a first direction by a snap ring attached to a connecting drum. The friction members of the first clutch are friction engaged by the first piston and the friction members of the second clutch are friction engaged by a second piston.

Dual connecting and disconnecting apparatus

An automatic transmission of a motor vehicle includes a first rotating element provided by coupling sun gears of a first planetary gear set and a second planetary gear set to each other, a second rotating element provided by coupling carriers of the first and second planetary gear sets to each other, a third rotating element provided by a ring gear of the first planetary gear set, and a fourth rotating element provided by a ring gear of the second planetary gear set. The first rotating element is selectively fixed to a transmission case by a first brake or coupled to an input shaft by a first clutch, and the second rotating element is selectively fixed to the case by a second brake or coupled to the input shaft by a second clutch. The fourth rotating element is coupled integrally to a ring gear of a third planetary gear set, and the third rotating element is coupled integrally to an output gear. With this arrangement, the automatic transmission establishes a selected one of the first-speed through sixth-speed gear stages and a reverse gear stage.

Automatic transmission

An automatic transmission includes a first rotating element provided by coupling a sun gear of a second planetary gear set and a carrier of a third planetary gear set to each other, a second rotating element provided by coupling a carrier of the second planetary gear set and a ring gear of the third planetary gear set to each other, a third rotating element provided by a ring gear of the second planetary gear set, and a fourth rotating element provided by a sun gear of the third planetary gear set. The first rotating element and the second rotating element are coupled to a case by first and second brakes, the fourth and first rotating elements are coupled to a ring gear of a first planetary gear set via first and second clutches, the second and first rotating elements are coupled to an input shaft via third and fourth clutches, and the third rotating element is integrally coupled to an output gear, so that the automatic transmission can provide eight forward gear stages by changing a combination of two of the clutches and brakes which are engaged to each other.

A switching valve is provided which operates hydraulic friction engaging elements in a combination to establish a fifth speed '5th' when in a first position, and in a combination to establish a third speed '3rd' when in a second position, when a first electromagnetic valve to a fifth electromagnetic valve fail so as to stop operating. As a result, in the event of failure while driving, the fifth speed &#x201c;5th&#x201d; is first established to enable the vehicle to continue running. Then, when the position of a manual valve is changed by an operation by the driver when the vehicle is stopped or the like, the switching valve shifts a transmission into the third speed &#x201c;3rd&#x201d;, which has a larger gear ratio than the fifth speed &#x201c;5th&#x201d;, to ensure the driving force required to take off again.

Hydraulic pressure control apparatus and method for vehicular automatic transmission

Of each rotating element of a second planetary gearset and a third planetary gearset, a first rotating element is constructed of a sun gear, a second rotating element is constructed of connected ring gears, a third rotating element is constructed of connected carriers, and a fourth rotating element is constructed of a sun gear. The first rotating element is connected to a case by a brake, the second rotating element is connected to the case by a brake, the fourth rotation element is connected to an input shaft via a clutch, the second rotation element is connected to the input shaft via a clutch, the first rotating element is integrally connected to a ring gear of a first planetary gearset, a third rotating element is integrally connected to an output gear, and six forward speeds from a first speed '1st' to a sixth speed '6th', and a reverse speed &#x201c;Rev&#x201d; are achieved according to an operation table.

An automatic transmission and method including a plurality of hydraulic servos which respectively engage and disengage a plurality of frictional engagement elements, a first solenoid valve for gear shifting which is used for generating a hydraulic pressure supplied to a predetermined hydraulic servo, a second solenoid valve for lock-up which is used for generating a hydraulic pressure supplied to a fluid transmission apparatus for executing a lock-up, a hydraulic control apparatus, a first connector which connects the first solenoid valve and the hydraulic control apparatus, a second connector which connects the second solenoid valve and the hydraulic control apparatus, a failsafe mechanism which achieves a predetermined shift range in a high-speed-side when the first connector is disconnected and a gear shift processing mechanism which achieves a predetermined shift range among a plurality of shift ranges when the second connector is disconnected.

Automatic transmission with a hydraulic control apparatus

To prevent the neutral state from being formed in a change gear apparatus and allow the obtaining of an intended gear change appropriately during a servo malfunction. Hydraulic servos engage and disengage a plurality of friction engagement elements; a hydraulic pressure supply system supplies the hydraulic servo of a predetermined friction engagement element with hydraulic pressure; and an auxiliary hydraulic pressure supply systems supplies a predetermined hydraulic servo with another hydraulic pressure, in the case where the hydraulic pressure supply system is placed in a first unsupplied state where the hydraulic pressure supply system cannot supply the hydraulic servo of the predetermined friction engagement element with hydraulic pressure. The auxiliary hydraulic pressure supply system does not supply the predetermined hydraulic servo with the other hydraulic pressure, in the case that the hydraulic pressure supply system is placed in a second unsupplied state where the hydraulic pressure supply system does not supply the hydraulic servo of the predetermined friction engagement element with hydraulic pressure.

Hydraulic control apparatus for automatic transmission

This invention provides a switch valve which can increase durability without causing driver discomfort at a time when a failure occurs. The switch valve has a spool is formed by a spool portion and a plunger which is arranged so as to freely abut against the spool portion. The switch valve also include a spool surrounding portion surrounding the spool and provided with a plurality of land portions. The spool selectively adopts a position at a normal, non-failure state and a position at a fail state. In the position at the normal state, at least one corner portion of the land in the plunger protrudes from an end portion of the corresponding land portion. Because a stepped wear portion is not formed on an inner peripheral surface of the land portion, foreign materials, such as wear powders or the like, do not enter a portion between an outer peripheral surface of the land and the inner peripheral surface of the land portion when the failure occurs.

Switch valve

A hydraulic control unit including a hydraulic servo for engaging and disengaging each friction engagement element, hydraulic pressure supply device for supplying hydraulic pressure to a hydraulic servo of a predetermined friction engagement element selected according to a gearshift position to be achieved, failure detection device for detecting a failure has occurred in the hydraulic pressure supply device, and fail-safe device for preventing interlock that occurs due to a plurality of friction engagement elements being engaged, and also prevents a gearshift from a high-speed position to a low-speed position, when the failure detection device detects that a failure has occurred.

Hydraulic control unit for automatic transmission

A hydraulic control device for an automatic transmission that can ensure power transmission when a failure occurs to the solenoid valve of the hydraulic control device, the hydraulic control device having a plurality of hydraulic servos for engaging and disengaging a plurality of friction engagement elements in accordance with the supply and discharge of a hydraulic pressure so as to prevent interlock from occurring to the transmission, a solenoid valve for generating a predetermined hydraulic pressure and supplying the predetermined hydraulic pressure to a hydraulic servo selected in correspondence with a target gear ratio and fail-safe means for supplying fail-safe hydraulic pressure to at least two hydraulic servos selected to attain an arbitrary gear ratio when a failure occurs to the solenoid valve and power transmission thereby becomes impossible. Further, the hydraulic control device has a plurality of solenoid valves for supplying the predetermined hydraulic pressure to the plurality of hydraulic servos and a shutoff valve, disposed between a hydraulic pressure source and one of the solenoid valves, for shutting off supply of hydraulic pressure to that one solenoid valve when hydraulic pressure to be supplied to the hydraulic servos selected in correspondence with the target gear ratio and hydraulic pressure to be supplied to the other hydraulic servos are generated.

Hydraulic control device for automatic transmission

Growing community of inventors

Seto, Japan

Yoshihiro Iijima