IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0349267
(1982-02-16)
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우선권정보 |
FR-0003720 (1981-02-25) |
발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Brown, Charles A.Brown, Charles E.
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인용정보 |
피인용 횟수 :
7 인용 특허 :
4 |
초록
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A torsion damping device for an automotive clutch plate assembly comprising two rotary parts, i.e. a hub with a hub disc and a pair of guide washers fixed to a friction disc. First and second spring stages are operatively circumferentially interposed between the rotary parts, the first stage spring(
A torsion damping device for an automotive clutch plate assembly comprising two rotary parts, i.e. a hub with a hub disc and a pair of guide washers fixed to a friction disc. First and second spring stages are operatively circumferentially interposed between the rotary parts, the first stage spring(s) having relative low stiffness and being operative during small relatively angular displacements of the rotary parts and the second stage spring(s) having relatively high stiffness and being operative during larger relative angular displacements of the rotary parts. A friction washer in frictional engagement between the rotary parts and producing most of the frictional torque is freely angularly mounted and has a position in the rest position of the torsion damping device independent of the springs. The angles subtended by the circumferential play J between second stage spring(s) and one of the rotary parts and the circumferential play L between a lug associated with the friction washer being such that the subtended angle corresponding to J-L is between a value greater than 0° (preferably 1°) and 5°.
대표청구항
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1. A torsion-damping device, for an automotive clutch plate assembly, comprising at least two coaxial parts mounted to rotate relative to one another within predetermined limits of angular movement, elastic means operatively interposed circumferentially between said rotary parts, and friction means
1. A torsion-damping device, for an automotive clutch plate assembly, comprising at least two coaxial parts mounted to rotate relative to one another within predetermined limits of angular movement, elastic means operatively interposed circumferentially between said rotary parts, and friction means comprising at least two friction washers being interposed axially between said rotary parts, said elastic means comprising a first spring stage of at least one relatively low stiffness spring operative during small relative angular displacements between said rotary parts, said elastic means comprising a second spring stage of at least one relatively high stiffness, chordally oriented spring operative during larger relative angular displacements between said rotary parts, said second stage spring in the rest position of said torsion damping device being located partly, without circumferential play, in a housing formed in a first of the rotary parts and partly, with circumferential play J1 for one direction of rotation of said assembly and circumferential play J2 for the opposite direction, in another housing formed in the second of said rotary parts, friction torque caused by one of said friction washers being a multiple greater than 1 of the friction torque caused by the rest of said friction means of said torsion damping device operating at the same time, at least one lug associated with said one friction washer, at least one face of said one friction washer contacting a first of said two rotary parts, said one friction washer being freely slidably mounted about the axis of the torsion-damping device and the position of said one friction washer in the rest position of said torsion damping device being independent of the action of said springs of said elastic means, and said lug being disposed between said one friction washer and the second of said rotary parts, said lug being integral with a selected one of said one friction washer and said second rotary parts, said lug having a chordal length L1 and being received in a passage in the other of said friction washer and said second rotary part, said passages having a chordal length L2, the angles subtended by the chordal play J1, J2 and by the chordal lengths L1, L2 being such that the subtended angle corresponding to [(J1+J2)-(L2-L1)] is between a value greater than 0° and no greater than 5°. 2. A torsion-damping device according to claim 1, in which both faces of said one friction washer contact said first rotary part. 3. A torsion-damping device according to claim 2, in which said one friction washer is disposed axially between two application washers, a first of said application washers being in contact with one of the rotary parts and connected for rotation to the other of said rotary parts and a second of said application washers is effectively connected for rotation to said first application washer. 4. A torsion-damping device according to claim 3, in which said first application washer has at least one axial lug to connect it for rotation with said other rotary part, said lug being received in a recess in said second application washer, so as to engage said second application washer on said first application washer without play. 5. A torsion-damping device according to claim 3, in which, independently of one another, said first application washer and said second application washer are each connected for rotation by at least one axial lug to said other rotary part. 6. A torsion-damping device according to claim 2, in which an application washer urged by axially acting elastic means is connected for rotation to one of said rotary parts, said one lug disposed between said friction washer and said second rotary part extending between said one friction washer and said application washer. 7. A torsion-damping device according to claim 2, in which said one friction washer is in contact with an interposed washer disposed between said one friction washer and said application washer and connected for rotation with said first rotary part. 8. A torsion-damping device according to claim 2, in which said first rotary part comprises a hub and a hub disc fixed for rotation with said hub, said one friction washer being disposed between said hub disc and an interposed washer connected for rotation with said hub. 9. A torsion-damping device according to claim 1, in which said lug extends radially. 10. A torsion-damping device according to claim 9, in which one of said rotary parts comprises a hub and the other of said rotary parts comprises at least one guide washer, a bearing being interposed between the hub and said guide washer, said bearing being in engagement with said guide washer to rotate therewith and said bearing comprising a radial collar extending substantially parallel to said guide washer, said one friction washer being interposed axially between said radial collar of said bearing and said guide washer with which said guide washer is fixed for rotation. 11. A torsion-damping device according to claim 10, in which said one friction washer is disposed between said radial collar of said bearing and a component fixed for rotation with said guide washer. 12. A torsion-damping device according to claim 1, in which said lug extends axially. 13. A torsion-damping device according to claim 12, in which one of said rotary parts comprises a hub and a hub disc integral with said hub whilst said other rotary part comprises at least one guide washer, the passage in which said lug is engaged being located in a selective one of said hub disc, said guide washer and an application washer engaged for rotation with one of said rotary parts. 14. A torsion-damping device according to claim 1, in which said friction means comprises another friction washer in contact with one of said rotary parts and having at least one axial lug received in a passage in the other of said rotary parts and also at least two radial arms engaged on said second spring. 15. A torsion-damping device according to claim 14, in which each of said friction washers is subjected to independent axially acting elastic means. 16. A torsion-damping device according to claim 1, in which said subtended angle corresponding to [(J1+J2)-(L2-L1)] is between 1° and 5°. 17. A torsion-damping device according to claim 1, in which said lug is integral with said one friction washer. 18. A torsion-damping device according to claim 1, in which said lug is integral with said second rotary part. 19. A torsion-damping device according to claim 1, in which one of the rotary parts comprises a hub and a hub disc fixed for rotation with said hub, while the other of said rotary parts comprises at least one guide washer and one application washer urged by axially acting elastic means which bears on said guide washer, and is connected for rotation with said guide washer, said friction washer being located axially between said application washer and said guide washer. 20. A torsion-damping device according to claim 1, in which one of said rotary parts comprises a hub and a hub disc fixed for rotation with said hub, said one friction washer operating on a first side of said hub disc, the rest of said friction means operating on the other side of said hub disc. 21. A torsion damping device according to claim 1, with the friction torque caused by said one friction washer being a multiple greater than about 2 of the friction torque caused by the rest of said friction means of said torsion damping device operating at the same time. 22. A torsion damping device according to claim 1, with the friction torque caused by said one friction washer being a multiple greater than between about 2 and 5 of the friction torque caused by the rest of said friction means of said torsion damping device operating at the same time.
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