Toyota Jidosha Kabushiki Kaisha

Toyoda Koki Kabushiki Kaisha

Hisashi Fukuchi

Kunihiko Suzuki

Naoyuki Kokubo

Satoshi Ashida

Hiroshi Takuno

Masaki Inui

Tsuyoshi Murakami

Toshifumi Sakai

Naoyuki Sakai

Tomoyuki Kano

Hirokazu Suzuki

Mikiharu Oyabu

Masayuki Shimada

Hideyuki Iwata

Yasuie Takahashi

Yoshiaki Senga

Kenji Arai

Tomohiro Maruyama

Akio Mukainaka

Masayuki Shibuya

There is disclosed a drive force transmission apparatus which includes a first pressing-force generation unit for generating a pressing force in accordance with a rotational speed difference between driving and driven shafts, and a frictional clutch which is brought into an engaged state by the pressing force generated by the first pressing-force generation unit in order to transmit torque in accordance with the rotational speed difference between the driving and driven shafts. The drive force transmission apparatus further includes a second pressing-force generation unit disposed opposite to the first pressing-force generation unit with respect to the frictional clutch. When needed, the second pressing-force generation, unit is operated to bring the frictional clutch into a firmly engaged state, thereby improving the traveling performance of the vehicle under severe traveling conditions, such as an attempt to extract a wheel trapped in a gutter or the like, traveling on a rough road, traveling on sand, etc.

Drive force transmission apparatus

A drive force transmission apparatus includes a housing connected to one of two shafts that are rotatable relative to each other, a rotary shaft rotatably supported by the housing and connected to the other shaft, and a multiple disc clutch composed of a plurality of outer plates engaged with the housing in the rotational direction and a plurality of inner plates engaged with the rotary shaft in the rotational direction. The multiple disc clutch transmits rotational torque between the housing and the rotary shaft through frictional engagement between the outer plates and the inner plates. The apparatus also includes a pressure generation mechanism for generating a pressure corresponding to a rotational-speed difference between the housing and the rotary shaft and for applying the generated force to the multiple disc clutch via a piston. The pressure generating means is composed of a plurality of rotary blades accommodated within a cylindrical space formed between the piston and the housing and rotating together with the rotary shaft, a viscous fluid charged into a plurality of pressure chambers defined by the housing, the piston, and the rotary blades, and a free blade accommodated within at least one pressure chamber. The free blade is freely movable in the circumferential direction between the rotary blades.

A gear-shift mechanism for a transmission unit which includes a fork shaft slidably supported in a housing assembly which is selectively shifted from its neutral position to forward and reverse positions, a detent mechanism for selectively retaining the fork shaft in its neutral and shifted positions, a shift head member slidable on the fork shaft, a one-way engagement mechanism for effecting the engagement between the shift head member and the fork shaft during axial displacement of the fork shaft toward and away from its reverse position, and a shift arm member pivotably mounted to the inner wall structure of the housing assembly and linked with the shift head member to retain an idler gear in its neutral position and engage the same with driving and driven gears. The detent mechanism includes a first holder member having a slot in its upper portion and a shaft fixed to the upper side portion of the first holder member and a second holder member fitted into the first holder member. The head portion of the shaft fixed to the first holder member can be engaged with another head portion provided at a select return spring holder. The second holder member retains one of synchronizers in a neutral position when shifted to a reverse speed.

Totally synchronized manual transmission unit for use in a vehicle

A gear-shift mechanism for a manual transmission includes first, second and third shift heads arranged in sequence, the first and second shift heads each being operatively connected to first and second synchronizers respectively for establishing first and second speed gear trains and for establishing third and fourth speed gear trains, and the third shift head being operatively connected to a shift fork for establishing a reverse gear train, and further includes a shift-and-select lever operatively connected to a manual shift lever to be axially shifted in selecting operation for selective engagement with the shift heads and to be rotated at its shifted position in shifting operation for establishment of the selected gear train. The gear-shift mechanism is arranged to temporarily operate the first synchronizer in shifting operation for establishment of the reverse gear train so as to effect synchronous rotation of input and output shafts of the transmission prior to the establishment of the reverse gear train.

Gear-shift mechanism for manual transmission

A transmission unit comprises a differential gear unit having a pair of side-journals rotatably supported by a pair of axially spaced side-bearings carried on a pair of carrier portions of a casing for the transmission unit, a pair of wheel axles extending outwardly through the respective side-journals from the differential gear unit in an opposite direction and surrounded by a pair of annular seal members carried on the respective carrier portions, a pair of annular shim plates interposed between each of the carrier portions and each of the side-bearings, and a pair of oil passages for leading lubricating oil into a pair of annular side-spaces formed around each of the wheel axles between the respective side-bearings and the respective seal members. Each of the annular shim plates is formed at the inner peripheral portion thereof with a number of circumferentially spaced radial projections and recesses which are arranged to radially lead the lubricating oil onto each of the wheel axles for lubrication of the side-journals.

Lubrication device in transmission unit for automotive vehicles

Growing community of inventors

Toyota, Japan

Hisashi Fukuchi