Kabushiki Kaisha F. C. C.

Honda Motor Co., Ltd.

Katsu Yoshimoto

Han Hiong Chen

Yoshihiko Ozawa

Makoto Kataoka

Junichi Nishikawa

Akio Ooishi

Atsushi Ogasawara

Masahiko Tsuchiya

Masashi Furuya

Kenichiro Isobe

Junya Watanabe

Kaoru Aono

Masataka Murai

Yoshiki Nagahashi

Naoyuki Miwa

Kazumitsu Yamamoto

Shinya Wakabayashi

Masaki Yoneyama

Hideo Senmyo

Shunichi Itou

Masayuki Nonaka

Masayoshi Suzuta

Hisao Otsuka

Hideaki Segami

Hiroshi Ori

Yoshimi Sakurai

Kenichiro Takahashi

Akira Kosaka

During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

Power transmission apparatus

A power transmission apparatus includes a clutch connected to an output shaft to rotate a wheel of a vehicle, and a clutch pressure plate movable between an operating position where driving and driven clutch plates are pressed against each other so as to enable transmission of a driving force of an engine to the wheel and a non-operating position where a pressing force exerted on the driving and driven clutch plates is released so as to cut off transmission of the driving force of the engine to the wheel. One of the driven clutch plates is attached to a second clutch, and another is attached to the clutch pressure plate. The clutch pressure plate includes an oil flow passage through which oil flows to the driven clutch plate attached to the clutch pressure plate.

In a power transmission apparatus, a centrifugal clutch includes a holder, a press, a first spherical body that is partially protruded from a first opening and in contact with a rolling contact surface of the press so as to be rollable thereon, and a second spherical body that is partially protruded from a second opening and in contact with a rolling contact surface of the holder so as to be rollable thereon. A through hole has a tapered shape from the first opening to the second opening. Disconnection of the first spherical body is prevented by an outer peripheral edge of one of the first opening and the second opening that has a smaller diameter.

In a power transmission apparatus, an auxiliary clutch plate different in diameter from driving and driven clutch plates located in a clutch housing. When the driving and driven clutch plates are pressed against each other, the auxiliary clutch plate is pressed to enable transmission of a driving force of an engine to a driving wheel. When a pressing force exerted on the driving and driven clutch plates is released, a pressing force exerted on the auxiliary clutch plate is released to cut off transmission of the driving force of the engine to the driving wheel.

In a power transmission apparatus, a centrifugal clutch includes a holder, a press, and springs to urge masses from a radially outer position to a radially inner position. The masses are each housed in an associated one of housing portions arranged in a circumferential direction of the holder such that the masses are radially movable. More than one spring is provided in the circumferential direction between an inner peripheral wall surface of each of the housing portions and an associated one of the masses to urge the associated mass from the radially outer position to the radially inner position.

In a power transmission apparatus, a second clutch includes a divider dividing driving clutch plates and driven clutch plates in an axial direction such that a first region adjacent to a clutch pressure plate and a second region adjacent to a centrifugal clutch are defined. The second clutch presses the driving clutch plates and the driven clutch plates in the first region and the second region against each other during operation of the centrifugal clutch, and presses the driving clutch plates and the driven clutch plates in the first region against each other during operation of a back torque transmission cam.

A power transmission apparatus a centrifugal clutch including a holder and a press. The holder and the press are each circumferentially provided with protrusions fitted and attached to cut-outs of a clutch housing. The holder is an integrated assembly into which a mass that is being held is integrated. The integrated assembly and the press are non-connected separate components and are independently movable toward or away from each other.

A power transmission device has a first pressure member (), a second pressure member () and a back-torque transmitting cam. The first pressure member () presses the drive-side clutch plates () and the driven-side clutch plates () against each other. The second pressure member () releases a press-contact force between the drive-side clutch plates () and the driven-side clutch plates (). The back-torque transmitting cam moves the second pressure member () relative to the first pressure member () to keep pressing the drive-side clutch plates () and the driven-side clutch plates () against each other when a rotational force is input to the clutch member (), via the output shaft (), in a process where the weight member () moves from the radially-outer position to the radially-inner position and the first pressure member () moves to follow the interlocking member ().

Power transmission device

A power transmission device has a pressure member, drive-side clutch plates, driven-side clutch plates, a clutch spring, a separate receiving member, and a back-torque limiting cam. A radially-outside restricting portion restricts radially-outward movement of the receiving memberrelative to the pressure member. This maintains clearance t between a side surfaceof the receiving memberand an inner peripheral wallof a clutch member

Provided is a clutch device configured so that close contactability between a cam surface of a center clutch and a cam surface of a pressure clutch can be improved and torque transmission can be stabilized accordingly. The clutch device () includes a center clutch () and a pressure clutch (). The center clutch () includes center-side cam portions (), a pressure clutch slide portion (), and a lifter plate slide portion (). The pressure clutch () includes pressure-side cam portions (), a lifter plate (), and a second center clutch slide portion (). The lifter plate () includes first center clutch slide portions (). A clearance (C) between the second center clutch slide portion () and the pressure clutch slide portion () is set greater than a clearance (C) between the first center clutch slide portion () and the lifter plate slide portion ().

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Hamamatsu, Japan

Katsu Yoshimoto