IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0713580
(2010-02-26)
|
등록번호 |
US-8529387
(2013-09-10)
|
발명자
/ 주소 |
- Lannutti, Anthony E.
- Dutil, Kevin
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
68 |
초록
▼
A pulley assembly for use in an automobile accessory drive system includes a shaft engaging hub, a pulley member, a nut treaded onto the shaft engaging hub, and a brake member interposed between the pulley member and the nut. The shaft engaging hub is engaged with an accessory input shaft for rotati
A pulley assembly for use in an automobile accessory drive system includes a shaft engaging hub, a pulley member, a nut treaded onto the shaft engaging hub, and a brake member interposed between the pulley member and the nut. The shaft engaging hub is engaged with an accessory input shaft for rotation therewith. Frictional engagement between the pulley member, the brake member, and the nut transfers torque from the pulley member to the input shaft. The pulley member includes an inner coupling surface and a peripheral belt-engaging surface. The nut includes an outer coupling surface. The brake member includes a first coupling surface in frictional engagement the outer coupling surface of the nut and a second coupling surface in frictional engagement with the inner coupling surface of the pulley member. When torque is applied to the nut in a first direction the out coupling surface of the nut couples to the inner coupling surface of the brake member such that the hub and the nut rotate with the pulley member. The outer coupling surface of the nut and the inner coupling surface of the brake member decouple when torque applied to the nut is in a second direction opposite the first direction such that the hub rotates relative to the pulley member.
대표청구항
▼
1. A pulley assembly for use in an automobile accessory drive system, the pulley assembly comprising: a shaft engaging hub including an axis of rotation, an outer threaded surface, and a bore for receiving an accessory input shaft for engagement therewith;a pulley member including a bore that receiv
1. A pulley assembly for use in an automobile accessory drive system, the pulley assembly comprising: a shaft engaging hub including an axis of rotation, an outer threaded surface, and a bore for receiving an accessory input shaft for engagement therewith;a pulley member including a bore that receives the shaft engaging hub, the pulley member including an inner coupling surface and an outer peripheral belt-engaging surface;a nut including an inner threaded surface that is engaged with the outer threaded surface of the shaft engaging hub, the nut also including an outer coupling surface that is angled relative to the axis of rotation of the shaft engaging hub; anda brake member interposed between the pulley member and the nut, the brake member being radially expandable outward toward the pulley member and including a first coupling surface in frictional contact with the outer coupling surface of the nut and a second coupling surface in frictional contact with the inner coupling surface of the pulley member;wherein, when the torque applied member is in a first direction, the brake member rotates with the pulley member, and, as a result of the frictional engagement of the first coupling surface of the brake member with the outer coupling surface of the nut, the brake member urges the nut to rotate and thereby travel the outer threaded surface of the shaft engaging member for axial translation of the nut into the brake member to radially expand the brake member outward toward the pulley member to frictionally couple the nut and brake member to the pulley member for rotation therewith. 2. The pulley assembly of claim 1, wherein rotation of the nut in a second direction opposite the first direction decouples the outer coupling surface of the nut from the first coupling surface of the brake member such that the nut and shaft engaging hub rotate relative to the pulley member. 3. The pulley assembly of claim 2, wherein the outer coupling surface of the nut and the first coupling surface of the brake member are cooperating friction surfaces that extend at an acute angle between approximately 5 and 45 degrees relative to the axis of rotation of the shaft engaging hub. 4. The pulley assembly of claim 3, wherein the outer coupling surface of the nut and the first coupling surface of the brake member extend at an angle between approximately 10and 20 degrees relative to the axis of rotation of the shaft engaging hub. 5. The pulley assembly of claim 1, wherein the brake member comprises a plurality of arcuate brake shoes made of a composite of first and second materials, the second material located at the first and second coupling surfaces. 6. The pulley assembly of claim 5 wherein the first and second coupling faces comprise a brake material. 7. The pulley assembly of claim 1 further comprising an end cap coupled to the shaft engaging hub for rotation therewith, the end cap including a groove near its outer perimeter that receives a portion of the pulley member to define a debris-resistant nonlinear path between an interior and an exterior of the pulley assembly. 8. The pulley assembly of claim 1, further comprising: a cover plate coupled to the shaft engaging hub for rotation therewith; anda torsion spring having a first end engaged with the cover plate and a second end engaged with the nut;wherein the torsion spring biases the nut to rotate in a first direction about the outer threaded surface of the shaft engaging hub. 9. The pulley assembly of claim 8, further comprising a bearing assembly having an inner race coupled to the shaft engaging hub and an outer race coupled to the pulley member to permit the shaft engaging hub to rotate relative to the pulley member when the first coupling surface of the brake member and the outer coupling surface of the nut decouple. 10. A pulley assembly for use in an automobile accessory drive system, the pulley assembly comprising: a shaft engaging hub including an axis of rotation and an outer threaded surface;a pulley member including an inner coupling surface and an outer peripheral belt-engaging surface;a nut including an outer coupling surface and an inner threaded surface that is engaged with the outer threaded surface of the shaft engaging hub to form a threaded connection; anda brake member interposed between the pulley member and the nut, the brake member including a first coupling surface in frictional contact with the outer coupling surface of the nut and a second coupling surface in frictional contact with the inner coupling surface of the pulley member, and being initially rotatable with the pulley member, relative to the shaft engaging hub, in a first direction until the brake member is radially expanded outward toward the pulley member by the axial travel of the nut as it rotates about the outer threaded surface of the shaft engaging hub;wherein the outer coupling surface of the nut and the first coupling surface of the brake member are both angled between approximately 5 and 45 degrees relative to the axis of rotation of the shaft engaging hub. 11. The pulley assembly of claim 10 wherein the outer coupling surface of the nut and the first coupling surface of the brake member arc both angled between approximately 10and 20 degrees relative to the axis of rotation of the shaft engaging hub. 12. The pulley assembly of claim 10 wherein the first coupling surface of the brake member is not parallel to the second coupling surface of the brake member. 13. The pulley assembly of claim 12 wherein the inner coupling surface of the pulley member is approximately parallel to the axis of rotation of the shaft engaging hub. 14. The pulley assembly of claim 10 further comprising: a cover plate coupled to the shaft engaging hub for rotation therewith; anda torsion spring having a first end engaged with the cover plate and a second end engaged with the nut. 15. The pulley assembly of claim 14 wherein the cover plate includes an axially extending, outer circumferential flange that surrounds a portion of the pulley member to define a non-linear path between an interior and exterior of the pulley assembly. 16. The pulley assembly of claim 10 wherein the brake member is formed from a first material and the first coupling surface is coated with a second material. 17. A pulley assembly for use in an automobile accessory drive system, the pulley assembly comprising: a hub having an axis of rotation, an outer threaded surface, and a shoulder extending outward, away from the axis of rotation, a distance greater than the threaded surface;a nut having an inner threaded surface and an outer friction bearing surface, the inner threaded surface threadably engaged with the outer threaded surface of the hub;a pulley member having an inner friction bearing surface and an outer belt engaging surface; anda brake member having a first surface in frictional contact with the outer friction bearing surface of the nut, a second surface in frictional contact with the inner friction bearing surface of the pulley member, and an inner ledge, extending toward the axis of rotation, in frictional contact with the shoulder of the hub. 18. The pulley assembly of claim 17, wherein rotation of the nut in a first direction about the axis of rotation causes the nut to translate along the axis of rotation toward the brake member via threaded engagement with the hub so as to increase frictional force between the outer friction bearing surface of the nut and the first surface of the brake member, and wherein rotation of the nut in a second direction opposite the first direction causes the nut to translate away from the brake member so as to decrease frictional force between the out friction bearing surface of the nut and the first surface of the brake member. 19. The pulley assembly of claim 18, further comprising a cover plate coupled to the hub for rotation therewith; and a torsion spring having a first end engaged with the cover plate and a second end engaged with the nut, wherein the torsion spring resists rotation of the nut in the second direction. 20. The pulley assembly of claim 18, wherein the outer friction bearing surface of the nut forms an acute angle with the axis of rotation of between approximately 5 to 45 degrees. 21. The pulley assembly of claim 17, wherein the brake member comprises a plurality of arcuate brake shoes positioned around the nut, each brake shoe movable in a radial direction in response to axial movement of the nut along the threaded surface. 22. A method of manufacturing a pulley assembly for use in an automobile accessory drive system, the method comprising the steps of: providing a shaft engaging hub including an axis of rotation, an outer threaded surface, and a bore for receiving an accessory input shaft for engagement therewith;providing a pulley member including a bore that receives the shaft engaging hub, the pulley member including an inner coupling surface and an outer peripheral belt-engaging surface;providing a nut including an inner threaded surface that is engaged with the outer threaded surface of the shaft engaging hub, the nut also including an outer coupling surface that is angled relative to the axis of rotation of the shaft engaging hub;providing a brake member interposed between the pulley member and the nut, the brake member being initially rotatable with the pulley member, relative to the shaft engaging hub, in a first direction until the brake member is radially expanded outward toward the pulley member by the axial travel of the nut as it rotates about the outer threaded surface of the shaft engaging hub and including a first coupling surface in frictional contact with the outer coupling surface of the nut and a second coupling surface in frictional contact with the inner coupling surface of the pulley member;selecting a thread pitch of the outer threaded surface of the hub, selecting a friction material located at the first coupling surface of the brake member, and selecting the angle formed between the outer coupling surface of the nut and the axis of rotation of the hub such that the pulley assembly is operable as a clutch to disengage the hub from the pulley member for rotation of the hub in one direction relative to the pulley member. 23. The method of claim 22, further comprising selecting the thread pitch, the friction material located at the first coupling surface of the brake member, and the angle between the outer coupling surface of the nut and the axis of rotation in combination to minimize the torque needed to disengage the hub from the pulley member for relative rotation. 24. The method of claim 22, further comprising selecting a coefficient of friction between the first coupling surface of the brake member and the outer coupling surface of the nut.
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