Koyo Seiko Company, Ltd.

Jtekt Corporation

Yasuhito Tanaka

Yoshitaka Nakagawa

Hajime Tazumi

Junya Ooitsu

Hideki Fujiwara

An alternator pulley includes a driving member driven and rotated via a belt from an output shaft of an engine. A driving member is disposed on an inner surface of the driving member and a one-way clutch is interposed between the driving and driven member. The one-way clutch includes rollers capable of rolling in a locked side direction along which a rotating power of the driving member is transmitted to the driven member or a free side direction along which the rotating powder is interrupted. Depending on a relative speed difference between the driving member and the driven member, the rollers are biased for pressing in the locked side direction and a torque value of the pressing is set preferably to less than 4 Nm.

Alternator pulley

A pulley unit made by interposing a one-way clutch in an annular space between a pulley and an axial body providing a deep groove ball bearing on a base end side of the one-way clutch, and a roller bearing on the free end side; setting an inner rolling surface of a roller of the one-way clutch to be an outer diameter surface of the axial body and an inner rolling surface of a rolling member of the roller bearing to be an outer diameter surface of the axial body. The pulley unit permits easy position setting of the pulley, so that stabilized lock and free operation can be expected and productivity can be improved.

Pulley unit

A pulley unit A includes two, inner and outer ring bodies,disposed concentrically, a one-way clutch,interposed in an annular space between both ring bodies,, and rolling bearings provided on both sides of the one-way clutch,in the annular space, wherein a recessed part,provided on a member,where a cam face,for forming a wedge space for storing a roller,of the one-way clutch,is formed and a projecting part,provided on the axial one end of a cage,of the one-way clutch,are fitted to each other in the axial direction to prohibit the circumferential movement of the cage,, and the projecting part,is physically checked from slipping off the recessed part,to prohibit the axial movement of the cage

In an annular space between a pulley and a shaft body disposed coaxially with each other, a one-way clutch is interposed in an intermediate range in an axial direction and rolling bearings are disposed on both sides in the axial direction of the one-way clutch. A tightening distance for fitting between the one-way clutch and pulley is set to be smaller than that between the rolling bearing and pulley. Due to this structure, in a condition in which an excessive radial load acts upon the pulley, that radial load acts on not the one-way clutch but the rolling bearings on both sides thereof, so that a clutch operation of the one-way clutch can be carried out stably.

A pulley unit comprising two inner and outer annular bodies disposed coaxially and a one-way clutch interposed in an annular space between both the annular bodies, both ends in the axial direction of the annular space being sealed by a seal and at least the sealed portion of at least one seal being hidden by an annular member mounted to the inner annular body. By this structure, the sealed portion by the seal is protected from a direct splash of water, so that invasion of water through the sealed portion becomes unlikely to occur.

A pulley has a hub fixed to a rotating shaft. An outer wheel is disposed on the outer periphery of the hub and around which a belt is suspended, and a unidirectional clutch is interposed between the hub and the outer wheel. A cam face for forming a wedged space of the unidirectional clutch is formed at the inside of the pulley, whereby the unidirectional clutch is switched between a free state and a locked state through the rotational variation of the hub which rotates integrally with the rotating shaft to reduce the transmission of the rotational variation from the hub to the outer wheel. Further, the unidirectional clutch can operate stably without suffering the effect of the rotational centrifugal force.

Growing community of inventors

Nara, Japan

Yasuhito Tanaka