A drive system for a rotary device, such as an automotive alternator compensates for and dampens the effect of sudden bidirectional rotational velocity variations of the pulley caused by sudden acceleration and deceleration of an internal combustion engine without using a one-way clutch. The drive s
A drive system for a rotary device, such as an automotive alternator compensates for and dampens the effect of sudden bidirectional rotational velocity variations of the pulley caused by sudden acceleration and deceleration of an internal combustion engine without using a one-way clutch. The drive system in one aspect comprises an axially movable cam member rotatably supported on a hub that is connected to the alternator shaft and that is journaled within the pulley. The cam member is coupled to the pulley by splines so that it rotates with the pulley while affording axial movement. Springs urge the cam member into engagement with a cam follower on the hub. Upon sudden acceleration or deceleration of the pulley, the cam member rotates angularly relative to the cam follower and moves axially to compress the springs, which exert a restoring force on the cam member and cam follower to eliminate their relative angular rotation. In other aspects, projections on the pulley and the hub operate on springs or fluid filled chambers to dampen sudden velocity changes.
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1. A drive system for a rotary device having a shaft, comprising: a pulley adapted to be rotated by a prime mover;a hub connected to the shaft and journaled for rotation within the pulley;a movable member slideably disposed for axial movement on the hub and within the pulley, the movable member bein
1. A drive system for a rotary device having a shaft, comprising: a pulley adapted to be rotated by a prime mover;a hub connected to the shaft and journaled for rotation within the pulley;a movable member slideably disposed for axial movement on the hub and within the pulley, the movable member being rotationally fixed to the pulley for rotation therewith;a cooperating member on the hub engaging the movable member to transmit rotation of the pulley to the shaft, the cooperating member and the movable member being slideable relative to each other to afford relative bidirectional rotation between the members over a predetermined range of angular rotations;wherein a first one of said members comprises a cam and a second one of said members comprises a cam follower, the cam and the cam follower respectively having cooperating cam lobes and cam follower elements that produce axial movement of the movable member upon said relative angular rotation of said members, the cam lobes and follower elements being symmetrically disposed at equal angles around a circumference of the cam and the cam follower, said angles establishing said predetermined range of angular rotations, and wherein the cam lobes comprise raised peaks connected by contoured ramps on a first surface of the cam, and the follower elements comprise rounded projections on a second surface of the cam follower that slide on said contoured ramps upon relative rotation of the cam and the cam follower, and wherein the movable member has first splines located on its periphery, and the pulley has cooperating second splines on an interior of the pulley that cooperate with the first splines to couple the movable member to the pulley for axial movement relative thereto; anda resilient mechanism urging the movable member into continuous engagement with the cooperating member; wherein bidirectional rotational velocity changes of the pulley cause corresponding relative angular rotation of the movable and cooperating members to reduce the impact of said velocity changes on the shaft. 2. The drive system of claim 1, wherein the movable and cooperating members are formed such that said relative rotation is transformed into axial movement of the movable member. 3. The drive system of claim 1, wherein said contoured ramps are contoured asymmetrically about a valley in the first surface between adjacent cam lobe peaks. 4. The drive system of claim 1, wherein said first and second splines extend axially on said movable member and said pulley, respectively, and are sized to permit the movable member to move axially on said hub a predetermined distance corresponding to the axial distance between the peaks and valleys of the cam, while retaining the movable member coupled to the pulley. 5. The drive system of claim 4, wherein said axial movement of the movable member rotates the movable member relative to the cooperating member and produces relative angular rotation of the pulley and the shaft. 6. The drive system of claim 1, wherein the resilient mechanism comprises a spring that exerts an axial force on the cam and the cam follower that increases as the relative angular rotation between the cam and the cam follower increases. 7. The drive system of claim 6, wherein the spring is selected to exert a force sufficient to overcome a torque load presented by the shaft for an axial movement of the movable member that is less than the axial distance between the peaks and valleys of the cam. 8. The drive system of claim 1, wherein said rotary device comprises an automotive alternator, and said prime mover comprises an internal combustion engine. 9. A drive system for a rotary device having a shaft, comprising: a pulley adapted to be rotated by a prime mover;a hub connected to the shaft and journaled for rotation within the pulley;a movable member slideably disposed for axial movement on the hub and within the pulley, the movable member being rotationally fixed to the pulley for rotation therewith;a cooperating member on the hub engaging the movable member to transmit rotation of the pulley to the shaft, the cooperating member and the movable member being slideable relative to each other to afford relative bidirectional rotation between the members over a predetermined range of angular rotations;wherein a first one of said members comprises a cam and a second one of said members comprises a cam follower, the cam and the cam follower respectively having cooperating cam lobes and cam follower elements that produce axial movement of the movable member upon said relative angular rotation of said members, the cam lobes and follower elements being symmetrically disposed at equal angles around a circumference of the cam and the cam follower, said angles establishing said predetermined range of angular rotations, and wherein the cam lobes comprise raised peaks connected by contoured ramps on a first surface of the cam, and the follower elements comprise rounded projections on a second surface of the cam follower that slide on said contoured ramps upon relative rotation of the cam and the cam follower, said contoured ramps being contoured symmetrically about a valley in the first surface between adjacent cam lobe peaks; anda resilient mechanism urging the movable member into continuous engagement with the cooperating member; wherein bidirectional rotational velocity changes of the pulley cause corresponding relative angular rotation of the movable and cooperating members to reduce the impact of said velocity changes on the shaft.
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이 특허에 인용된 특허 (25)
Nakamura, Shigenobu; Hayashi, Yoshinori, Alternator for vehicles.
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