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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKentaro Arai, Ryuichi Murakami, Susumu Takahashi, Yasunori Arai
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A four-wheel drive vehicle having a first hydraulic pump operated in operative association with the rotation of front wheels, and a second hydraulic pump operated in operative association with the rotation of rear wheels, such that a difference in rotational speed is produced between the front and rear wheels, a multi-plate clutch is brought into its engaged state by a hydraulic pressure generated by the hydraulic pumps, whereby the mode of the vehicle is shifted into a four-wheel drive mode. A torque cam mechanism is disposed between a clutch piston and clutch plates, so that when the difference in rotational speed is produced between the front and rear wheels, the torque cam mechanism produces an axial thrust force immediately to promptly bring the multi-plate clutch into its engaged state. The engagement of the multi-plate clutch is achieved with a sufficient engagement force by the hydraulic pressure thereafter produced by the hydraulic pump.
A power transmitting system for a four-wheel drive vehicle including front wheels to which a driving force from an engine is transmitted directly, and rear wheels to which a portion of the driving force from the engine is transmitted indirectly through a multi-plate clutch, said multi-plate clutch being brought into its engaged state by a hydraulic pressure generated by hydraulic pumps in accordance with a difference between rotational speeds of the front wheels and the rear wheels, said power transmitting system comprising:
Dependencies are inferred from the claim text.