Honda Giken Kogyo Kabushiki Kaisha

Jiro Obinata

Tatsuyuki Ohashi

Tetsuya Mochizuki

Shoji Asatsuke

Toshiaki Maeda

A transmission for a vehicle having a sub shaft supported in casings via bearings, and an input gear, an output gear, and a boss of a clutch outer, etc. stacked on the sub shaft and retained by a cotter key. The input gear and the output gear are helical gears, and thrust forces acting on the two gears are generated in opposite directions. A rightward thrust force acting on the input gear is borne by the casing via an annular projection, the sub shaft and the bearing, and a leftward force acting on the output gear, which is separated from the cotter key by a gap, is borne by the casing via the bearing provided on the side face of the output gear. This arrangement eliminates any need for fixing gears supported on a shaft of a transmission by a nut or a bolt in the axial direction, thus saving space and reducing the number of parts.

Vehicle transmission

With regard to an automatic transmission in which an oil passage is formed by interposing a separator plate between a torque converter case and a valve body, a housing of a bearing that supports a counter shaft is press-fitted in a recess of the torque converter case, the edge of the separator plate abuts the outer periphery of the housing, and a notch formed on the valve body superimposed on the separator plate is in contact with the end face of the housing, thereby preventing the bearing from falling out. When supporting the bearing in the recess of the torque converter case, the present invention enables the bearing having a large axial dimension to be supported without deepening the above-mentioned recess.

A changeover valve (13) connected to a shift valve unit (12) via four oil passages L3-L6, and two pressure regulating valves (14.sub.1, 14.sub.2) are provided. At speed changing when the changeover valve (13) is in a first (right) position, an off-going hydraulic clutch is connected to oil passage L3 to control its pressure drop by the pressure regulating valve (14.sub.1) and an on-coming hydraulic clutch is connected to L5 to control its pressure rise by the pressure regulating valve (14.sub.2). After completion of the speed changing, the changeover valve (13) is switched to a second (left) position. At speed changing when the changeover valve (13) is in the second position, an on-coming hydraulic clutch is connected to L4 to control its pressure rise by the pressure regulating valve (14.sub.1) and an off-going hydraulic clutch is connected to the L6 to control its pressure drop by the pressure regulating valve (14). After completion of the speed changing, the changeover valve (13) is switched to the first position. After completion of the speed changing, oil at line pressure is supplied to the on-coming hydraulic clutch from the line pressure oil passage L2 without passing through the pressure regulating valves, and oil is discharged from the off-going hydraulic clutch without passing through the pressure regulating valves.

Growing community of inventors

Wako, Japan

Jiro Obinata