Toyota Jidosha Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Naoki Moriguchi

Toshiyuki Asada

Akiharu Abe

Yasunori Nakawaki

Toshitake Suzuki

Yasuhiko Higashiyama

Ryoji Mizutani

Michitaka Tsuchida

Yuki Tojima

Junichiro Sakurai

Yuji Iwase

Kunio Morisawa

Makoto Ogiso

Hideyuki Nishida

Tadashi Tamura

Hiroyuki Nishizawa

Masataka Osawa

Keiji Yoeda

Masami Sugaya

Tadayuki Nagai

Daisuke Okamoto

Masayuki Ishibashi

Naoto Tanaka

Kisaburo Hayakawa

Toshinari Ogawa

Shuzo Sanda

Masanobu Kimura

Yasuhiko Higushiyama

A gear assembly wherein transmission efficiency is enhanced by a simple treatment is provided. The gear assembly includes a plurality of gears to transmit torque of a prime mover to an output member. Tooth surfaces of a first gear rotated at a highest speed are individually finished into a plateau surface, and a parameter representing a surface roughness of each of the plateau surface is smaller than those of the tooth surfaces of the other gears.

Gear assembly

A cooling structure for an in-wheel motor includes an in-wheel motor mounted within a wheel of a vehicle to drive the wheel or to be driven by the wheel, and an oil channel and a fin serving as 'heat radiating portions' to facilitate cooling of the in-wheel motor. The in-wheel motor has a case serving as a 'housing'. The &#x201c;heat radiating portion&#x201d; is located apart from the case.

Cooling structure for in-wheel motor

An electrically driven wheel includes a wheel disc and a wheel hub; an in-wheel motor mounted within the wheel disc to drive the wheel disc and the wheel hub or to be driven by the wheel disc and the wheel hub; a brake rotor and a brake caliper suppressing rotation of the wheel disc and the wheel hub while a vehicle is moving; and a parking lock mechanism provided in the in-wheel motor separately from a brake mechanism formed of the brake rotor and the brake caliper. The parking lock mechanism is a band-type brake frictionally engaging a planetary carrier serving as an 'output portion' of a 'reduction mechanism'.

Electrically driven wheel and vehicle

A controller determines a target gear ratio from an accelerator opening and a vehicle speed. The controller determines the stroke of a trunnion on the basis of the difference between present inclination and a target inclination, thereby to control stroke by a hydraulic control valve. The stroke is corrected according to input/output disc pushing force.

Speed change control apparatus for toroidal CVT

The invention relates to a control device for an engine able to control at least one of an intake valve and an exhaust valve via a driving mechanism actuated without a torque from an output shaft of the engine, and a transmission connected to the engine. The control device includes a torque transmitting device for reducing the torque from the engine while that torque is being transmitted to an output shaft of the transmission, and control means for controlling the torque transmitting device so as to reduce the torque transmitted from the engine to the output shaft of the transmission during an upshift, controlling a engine speed to a target speed after shifting during the unshift, and controlling the torque transmitting device so as to increase the torque transmitted to the output shaft of the transmission after the engine speed is synchronized with the speed after shifting.

Control device and method for engine and transmission

A speed changing gear device for an automatic transmission, comprising a main gear assembly for providing a plurality of operating positions, and an auxiliary gear assembly for providing a direct drive position and a speed changing drive position. The main gear assembly includes a single-pinion type first planetary gear unit having a first sun gear, a first planetary gear, a first ring gear and a first carrier, and a single-pinion type second planetary gear unit having a second sun gear, a second planetary gear, a second ring gear and a second carrier. The auxiliary gear assembly includes a third planetary gear unit having a third sun gear, at least one third planetary gear, a third ring gear and a third carrier. The first carrier and second ring gear are fixed to each other, or selectively connected to each other by a first clutch. The first and second sun gears, and the first sun gear and second carrier are selectively connected to each other by a second and a third clutch, respectively. The first sun gear, second sun gear and second carrier are selectively inhibited from rotating by a first brake, and the second carrier is inhibited from rotating by a second brake.

Speed changing gear device having two independent gear assemblies

A speed changing gear device for an automatic transmission, comprising a main gear assembly for providing a plurality of operating positions, and an axiliary gear assembly for providing a direct drive position and a speed changing drive position. The main gear assembly includes a single-pinion type first planetary gear unit having a first sun gear, a first planetary gear, a first ring gear and a first carrier, and a single-pinion type second planetary gear unit having a second sun gear, a second planetary gear, a second ring gear and a second carrier. The auxiliary gear assembly includes a third planetary gear unit having a third sun gear, at least one third planetary gear, a third ring gear and a third carrier. The first carrier and second ring gear are fixed to each other, or selectively connected to each other by a first clutch. The first and second sun gears, and the first sun gear and second carrier are selectively connected to each other by a second and a third clutch, respectively. The first sun gear, second sun gear and second carrier are selectively inhibited from rotating by a first brake, and the second carrier is inhibited from rotating by a second brake.

A planetary gear device having a first and a second single-pinion planetary gear unit and a third double-pinion planetary gear unit, which are coaxially disposed so as to provide different speed reduction ratios. The three gear units have respective first, second and third sun gears, respective first, second and third ring gears, and respective first, second and third carriers rotatably supporting planetary pinions. The first and second sun gears are fixed together or selectively connectable to each other, and the first carrier, second ring gear and third carrier are fixed together or selectively connectable to each other. Further, the second carrier and the third sun gear are fixed together or selectively connectable to each other. The present arrangement allows shifting operations of the gear device, without concurrent disengagement and engagement of different clutches.

Automatic planetary gear transmission

A gear train for changing the rotational speed of an input shaft to transmit the resultant rotation to an output shaft consists of single pinion type first and second planetary gear sets and a double pinion type third planetary gear set. A sun gear of the first planetary gear set is normally or selectively connected to a carrier and a sun gear of the second planetary gear set, a carrier of the first planetary gear set is normally or selectively connected to a carrier of the third planetary gear set, the carrier of the second planetary gear set is normally or selectively connected to a sun gear of the third planetary gear set, a ring gear of the second planetary gear set is normally or selectively connected to a ring gear of the third planetary gear set, the input shaft is selectively connected to either one or both of the sun gear and the ring gear of the first planetary gear set, and the output shaft is connected to the sun gear of the third planetary gear set, whereby at least five forward speeds and one reverse are permitted to be set.

Automatic transmission

An automatic transmission including gear trains, which are constructed of at least three planetary gear sets each having three rotating members. A first clutch is arranged closer to an input shaft than the first planetary gear set for connecting any one of the rotating members of the first planetary gear set arranged adjacent to the input shaft. A second clutch is also arranged closer to the input shaft than the first planetary gear set for connecting another of the rotating members of the first planetary gear set and the input shaft. A third clutch is interposed between the first planetary gear set and the second planetary gear set for connecting any one of the rotating members of the second planetary gear set arranged at the opposite side to the input shaft across the first planetary gear set and the any one or the another of the rotating members of either one of the first clutch and the second clutch or the first planetary gear set. A fourth clutch is interposed between the first planetary gear set and the second planetary gear set for connecting the another of the rotating members of the second planetary gear set and the any one or the another of the rotating members of the first clutch, the second clutch or the first planetary gear set.

Growing community of inventors

Susono, Japan

Naoki Moriguchi