Honda Giken Kogyo Kabushiki Kaisha

Masahiro Kanda

Kouhei Ohsono

Takahiro Matsuda

Takashi Aoki

Yoshimichi Tsubata

Toshiyuki Yumoto

Naoki Uchiyama

Eiji Ohyama

Keisuke Katsuta

Takafumi Hattori

In a belt type continuously variable transmission, the apertures of the drain ports of an oil pressure control valve employed for control of hydraulic devices are arranged outside of the circumferential region W of the range of movement in which the belt can be moved in the pulley axis direction when the pulley groove width is changed during gear change operation, or outside of the circumferential region W of the region in which the V groove face of the pulley can be arranged when the pulley groove width is changed during gear change operation.

Continuously variable transmission oil pressure control device

A lubricating structure for a wet multi-plate clutch is disclosed. The clutch comprises a clutch center member, a clutch guide member positioned radially outward with respect to said clutch center member, a plurality of friction plates disposed between the clutch center member and the clutch guide, the friction plates being alternately coupled to the clutch center member and the clutch guide member respectively. A clutch piston is located adjacent a first end one of the friction plates, for urging the friction plates into frictional engagement with one another, wherein a gap is formed between the piston and the end friction plate before the urging of the engagement of the friction plates. The lubricating structure comprises a first bore formed in the clutch guide member at a position near the first end one of the friction plates for discharging lubricating oil therethrough, and a second bore formed in the clutch center member for supplying lubricating oil to the clutch. The lubricating oil flows from the second bore, through the gap between the clutch piston and the first end friction plate, and through the first bore, before the clutch piston urges the friction plates into engagement, wherein the gap is closed and the flow of lubricating oil through the gap is stopped, when the clutch piston urges the friction plates into engagement.

Lubricating structure for wet multi-plate clutch

A clutch operational control apparatus (75) controls an engaging force of a starting clutch (5) which is provided in a power transmitting path including an automatic transmission (CVT). The control apparatus comprises an idling state detector of an engine, a vacuum pressure detector for detecting an actual intake vacuum pressure of the engine, a range judging unit for judging a shift position of a manual shift lever, a target intake vacuum pressure determining unit for determining a target intake vacuum pressure, and clutch engaging force control means for controlling the clutch engaging force. The target intake vacuum pressure determining unit determines the target intake vacuum pressure based on the actual intake vacuum pressure when it is judged that the shift position is in the non-driving range and further when it is detected that said engine is in the idling state. The clutch engaging force control means controls the clutch engaging force so that the actual intake vacuum pressure coincides with the target intake vacuum pressure when it is judged that the shift position is in the driving range and further when it is detected that the engine is in the idling state.

Clutch operational control apparatus

A belt-type continuously variable transmission for use with a motor vehicle engine has a hydraulic actuator for effecting at least one of speed ratio control and clutch control. The belt-type continuously variable transmission is controlled by a control system including a solenoid-operated control valve for generating a controlling hydraulic pressure to be supplied to the hydraulic actuator, a hydraulic pressure generator for generating a hydraulic pressure corresponding to the rotational speed of the engine, a directional control valve for selectively connecting the solenoid-operated control valve and the hydraulic pressure generating means to the hydraulic actuator, and a solenoid-operated on-off valve for controlling the directional control valve. When the solenoid of the solenoid-operated on-off valve is energized, the directional control valve connects the solenoid-operated control valve to the hydraulic actuator, and when the solenoid is de-energized, the directional control valve connects the hydraulic pressure generator to the hydraulic actuator.

Growing community of inventors

Wako, Japan

Masahiro Kanda