Aisin Seiki Kabushiki Kaisha

Koichiro Hirozawa

Noboru Murakami

Koichi Matsuo

Shigeo Takahashi

Kazuo Ohara

Kazuo Obara

Power transmission for motor vehicles including an input and an output shafts rotatable about a common axis, a planetary gear mechanism including interconnected three planetary gear sets, clutch means for selectively connecting elements of the gear mechanism with the input shaft, an element of the final stage gear set of the planetary gear mechanism being connected with the output shaft, brake means being provided for selectively constraining elements of the gear mechanism against rotation. A further set of planetary gear may be additionally combined with the planetary gear mechanism.

Power transmission for motor vehicles

A speed change gear system of the planetary gear type suited for applications within fluid couplings used upon automotive vehicles includes an input shaft and a first planetary gear set which includes a first sun gear, a first planetary gear engaged with the first sun gear, a first ring gear engaged with the first planetary gear, and a first carrier rotatably supporting the first planetary gear. A second planetary gear set similarly includes a second ring gear drivingly connected to the first carrier, a second planetary gear engaged with the second ring gear, a second sun gear engaged with the second planetary gear, and a second carrier rotatably supporting the second planetary gear, while a third planetary gear set likewise includes a third sun gear drivingly connected to the second sun gear, a third planetary gear engaged with the third sun gear, a third ring gear engaged with the third planetary gear and drivingly connected to the first ring gear and the second carrier, and a third carrier rotatably supporting the third planetary gear. A first clutch is provided for simultaneously coupling or uncoupling the second and third sun gears to or from the input shaft while a second clutch is also provided for simultaneously coupling or uncoupling the second carrier and the first and third ring gears to or from the input shaft, and a third clutch is likewise provided for coupling or uncoupling the first sun gear to or from the input shaft. A first brake is also provided within the system and is capable of being actuated for locking the first sun gear to the gear casing, while a second brake is likewise provided and is capable of being actuated for simultaneously locking the first carrier and the second ring gear to the casing and a third brake is similarly capable of being actuated for simultaneously locking the first and third ring gears and the second carrier to the casing. The output shaft is dynamically connected to the third carrier as one integral unit.

Speed change gear system

Disclosed herein is a hydraulic modulator valve for a control system of a hydraulically operated mechanism having a casing with a bore therein, a stepped spool axially and slidably engaged within the bore to form an annular fluid throttle passage against the circumference of the bore between a first and a second ports drilled through the casing, and spool actuator for controlling axial displacement of the spool. The stepped spool comprises a large diameter portion to be hermetically engaged within the bore, a small diameter portion and a medium diameter portion in sequence, the throttle passage being formed by the bore and the medium and small portions of the spool.

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Kariya, Japan

Koichiro Hirozawa