Honda Motor Co., Ltd.

Nobuhiro Kumagai

Shigeru Koyama

Noriyuki Abe

Shinji Fujimoto

Heisuke Kobayashi

Atsuhiro Sakai

Shin Fukasawa

Shunji Kamo

Kazuki Sakurai

Teruo Nagahama

Mitsuru Torihata

Hitoshi Tsukuda

Takeshi Uchino

In a transmission, an inner end portion in a radial direction of a washer abuts on an inner race of a first bearing, and a seal surface provided on an outer end in the radial direction of the washer abuts on an outer race of a second bearing. Therefore, load in an axial direction which acts on a second gear can be supported with a second rotary shaft via the outer race of the second bearing, the washer and the inner race of the first bearing. Additionally, on a side surface at the second bearing side, of the washer, a lubricating oil guide surface is formed, that guides lubricating oil which is supplied from an inside of a second rotary shaft, to a one-way clutch through the second bearing, and therefore, a lubricating effect can be enhanced by efficiently supplying the oil to the second bearing and the clutch.

Lubrication structure for transmission

If a sleeve of a double cone-type synchronizer is not smoothly engaged with a dog gear because of getting caught by the dog gear, the dog gear, as pressed by the sleeve, may lean with a spline-connecting part of the dog gear to a transmission gear as a fulcrum, so that an inner ring of a blocking ring may be damaged by being squeezed between the dog gear and a hub. However, the transmission gear includes: a tooth surface portion having tooth surfaces formed on one axial end side of the transmission gear; and a contact portion formed on the opposite axial end side, and abutting against the dog gear. The contact portion extends radially outward of a through-hole of the dog gear, thereby preventing the dog gear, as pressed by the sleeve, from leaning toward the transmission gear so as to prevent damage of the inner ring.

Transmission

To allow attachment of pinion shafts in their phased states only in simple steps which do not require a crimping step and a special device. A pinion shaft support structure for a planetary gear includes pinion gears, pinion shafts for pivotally supporting the pinion gears, and a carrier having a plurality of shaft support holes for rotatably supporting the pinion shafts, the pinion shafts being supported by the shaft support holes. The pinion shaft support structure includes stepped portions formed on end surfaces of the pinion shafts and a fall-out prevention washer which is mounted on the carrier to be capable of locking the stepped portions. An outer circumferential rim of the fall-out prevention washer mounted on the carrier faces the stepped portions of the respective pinion shafts inserted into the plurality of respective shaft support holes and is capable of locking the stepped portions, and the pinion shafts are thereby positioned (phased) in their rotational directions.

Pinion shaft support structure for planetary gear

A twin clutch type transmission in which, when establishing a reverse gear position, the driving force of an engine (E) is transmitted to driven wheels (W, W) via the path: even-numbered gear clutch (Ce)&#x2192;second input shaft ()&#x2192;second input shaft gear ()&#x2192;idle shaft second gear ()&#x2192;idle shaft first gear ()&#x2192;first countershaft first gear ()&#x2192;first countershaft ()&#x2192;first countershaft second gear ()&#x2192;third countershaft second gear ()&#x2192;first speed-third speed synchronizing device ()&#x2192;third countershaft ()&#x2192;third countershaft third gear ()&#x2192;second output shaft gear ()&#x2192;second output shaft ()&#x2192;final drive gear ()&#x2192;final driven gear ()&#x2192;differential gear (). When establishing a first speed gear position by engaging an odd-numbered gear clutch (Co), the whole of the driving force transmission path on the downstream side of the first countershaft first gear () is shared with that when establishing the reverse gear position, thus enabling the weight and dimensions of the transmission to be reduced effectively.

An automatic transmission for a hybrid vehicle has a first clutch connecting a first drive gear shaft rotatably supporting drive gears Gand G, to an input shaft, a second clutch connecting a second drive gear shaft, rotatably supporting drive gears Gand G, to the input shaft, a first meshing mechanism connecting the drive gears Gand Gto the first drive gear shaft, a second meshing mechanism connecting the drive gears Gand Gto the second drive gear shaft, a brake fixing a third element of a planetary gear mechanism to a transmission case, and a switching mechanism switching to where an electric motor is connected to a first element or where the electric motor MG is connected to the third element. The first element and the first drive gear shaft are connected. A second element and the drive gear Gare connected.

Growing community of inventors

Wako, Japan

Nobuhiro Kumagai