An overrunning clutch comprising a ratchet wheel (1) and a plurality of pawls (2) is disclosed. Each of the pawls (2) is rotationally supported on a disk member (5) by a shaft (3). The clutch is characterized by a permanent magnet (4) being fixed on the disk member (5) between the axes of the disk m
An overrunning clutch comprising a ratchet wheel (1) and a plurality of pawls (2) is disclosed. Each of the pawls (2) is rotationally supported on a disk member (5) by a shaft (3). The clutch is characterized by a permanent magnet (4) being fixed on the disk member (5) between the axes of the disk member (5) and the shaft (3) and facing the tail end of each pawl (2). Because each of the pawls are not driven by a spring in the clutch, the clutch could not be malfunction due to the fatigue failure of the spring in the case of frequent heavy load.
대표청구항▼
The invention claimed is: 1. A ratchet overrunning clutch comprising a ratchet wheel (1) and a plurality of pawls (2), each of the pawls (2) is rotationally supported on a disk member (5) by a shaft (3), wherein a permanent magnet (4) being fixed on the disk member (5) between the axes of the disk
The invention claimed is: 1. A ratchet overrunning clutch comprising a ratchet wheel (1) and a plurality of pawls (2), each of the pawls (2) is rotationally supported on a disk member (5) by a shaft (3), wherein a permanent magnet (4) being fixed on the disk member (5) between the axes of the disk member (5) and the shaft (3) of the pawl (2) and opposing to a tail end of pawl (2). 2. The clutch according to claim 1, wherein the pawl (2) includes a ratchet end (6) which engages with the teeth of said ratchet wheel and a tail end (7) away from the ratchet end (6), a through hole (8) for said shaft (3) is provided between the ratchet end (6) and the tail end (7). 3. The clutch according to claim 1, wherein the distance from the tip of the ratchet end (6) to the axis of the through hole (8) is larger than that from the tip of the tail end (7) to the axis of the through hole (8). 4. The clutch according to claim 1, wherein the permanent magnet (4) is made of Neodymium-Fe-Boron. 5. The clutch according to claim 4, wherein the shape of the permanent magnet (4) is a cylinder and its diameter is 16 mm and its height is 10 mm. 6. The clutch according to claim 1, wherein the shape of the permanent magnet (4) is a cylinder and its diameter is 16 mm and its height is 10 mm. 7. The clutch according to claim 1, wherein the distance between the tail end (7) of said pawl (2) and the permanent magnet (4) is 1 mm when a ratchet end (6) of said pawl (2) engages with the teeth (9); the maximum distance between the tail end (7) of said pawl (2) and the permanent magnet (4) is 5 mm when the pawl (2) disengages with the teeth (9). 8. A ratchet overrunning clutch comprising a ratchet wheel (1) and a plurality of pawls (2), each of the pawls (2) is rotationally supported on a disk member (5) by a shaft (3), wherein a permanent magnet (4) being fixed on the disk member (5) between the axes of the disk member (5) and the shaft (3) of the pawl (2) and opposing to a tail end of pawl, wherein the pawl (2) includes a ratchet end (6) which engages with the teeth of said ratchet wheel and said tail end (7) away from the ratchet end (6), a through hole (8) for said shaft (3) is provided between the ratchet end (6) and the tail end (7), and wherein the distance from the tip of the ratchet end (6) to the axis of the through hole (8) is larger than that from the tip of the tail end (7) to the axis of the through hole (8), and wherein the ratio of the distance from the tip of the tail end (7) to the center of the through hole (8) to the distance from the tip of the ratchet end (6) to the center of the through hole (8) is 1:1.1. 9. A ratchet overrunning clutch comprising a ratchet wheel (1) and a plurality of pawls (2), each of the pawls (2) is rotationally supported on a disk member (5) by a shaft (3), wherein a permanent magnet (4) being fixed on the disk member (5) between the axes of the disk member (5) and the shaft (3) of the pawl (2) and opposing to a tail end of pawl (2), wherein the clutch further includes a mounting sleeve (10) embedded in said disk member (5), and wherein the permanent magnet (4) is provided in said mounting sleeve (10). 10. The clutch according to claim 9, wherein the mounting sleeve (10) is made of non-magnetic material. 11. The clutch according to claim 10, wherein the mounting sleeve (10) is made of stainless steel. 12. The clutch according to claim 9, wherein the mounting sleeve (10) is made of stainless steel. 13. A ratchet overrunning clutch comprising a ratchet wheel; a disk member having an axis; a plurality of pawls, each of the pawls having a ratchet end for engaging the ratchet wheel and an oppositely extending tail end, each pawl being rotationally supported on the disk member by a shaft; and for each pawl a corresponding permanent magnet being fixed relative to the disk member at a distance from the axis of the disk member being less than a distance from the axis of the disk member to an axis of the shaft of the pawl, the magnet opposing the tail end of the pawl. 14. The clutch according to claim 13, wherein the pawl is formed having a through hole between the ratchet end and the tail end, the shaft being received in the through hole. 15. The clutch according to claim 14, wherein the ratchet end extends a distance from the axis of the shaft being greater than a distance the tail end extends from the axis of the shaft. 16. The clutch according to claim 13, wherein the permanent magnet is cylindrical, having a diameter of approximately 16 mm and a length of approximately 10 mm. 17. The clutch according to claim 13, wherein the permanent magnet comprises Neodymium-Fe-Boron. 18. The clutch according to claim 17, wherein the permanent magnet is cylindrical, having a diameter of approximately 16 mm and a length of approximately 10 mm. 19. The clutch according to claim 13, wherein the tail end of the pawl is spaced away from the permanent magnet when the ratchet end of the pawl is engaged with the ratchet wheel. 20. The clutch according to claim 19, wherein the permanent magnet is at least approximately 1 mm from the tail end of the pawl when the pawl is engaged with the ratchet wheel, and not more than approximately 5 mm when the pawl is disengaged from the ratchet wheel. 21. A ratchet overrunning clutch comprising a ratchet wheel (1) and a plurality of pawls (2), each of the pawls (2) is rotationally supported on a disk member (5) by a shaft (3), wherein a permanent magnet (4) being fixed on the disk member (5) between the axes of the disk member (5) and the shaft (3) of the pawl (2) and opposing to a tail end of pawl, wherein the pawl (2) includes a ratchet end (6) which engages with the teeth of said ratchet wheel and said tail end (7) away from the ratchet end (6), a through hole (8) for said shaft (3) is provided between the ratchet end (6) and the tail end (7), and wherein the distance from the tip of the ratchet end (6) to the axis of the through hole (8) is larger than that from the tip of the tail end (7) to the axis of the through hole (8), and wherein the ratio of the distance from the tip of the tail end (7) to the center of the through hole (8) to the distance from the tip of the ratchet end (6) to the center of the through hole (8) is 1:1.1. 22. A ratchet overrunning clutch comprising a ratchet wheel; a disk member having an axis; a plurality of pawls, each of the pawls having a ratchet end for engaging the ratchet wheel and an oppositely extending tail end, each pawl being rotationally supported on the disk member by a shaft; and for each pawl a corresponding permanent magnet being fixed relative to the disk member at a distance from the axis of the disk member being less than a distance from the axis of the disk member to an axis of the shaft of the pawl, the magnet opposing the tail end of the pawl, wherein the clutch further comprises a mounting sleeve embedded in the disk member, the permanent magnet being provided in the mounting sleeve. 23. The clutch according to claim 22 wherein the mounting sleeve is made of stainless steel. 24. The clutch according to claim 22, wherein the mounting sleeve is made of a non-magnetic material. 25. The clutch according to claim 24, wherein the mounting sleeve comprises stainless steel. 26. A ratchet overrunning clutch comprising: a) a ratchet wheel; b) a disk member; c) a plurality of pawls, each pawl being rotationally supported by the disk member and having a ratchet end for engagement with the ratchet wheel and a tail end extending oppositely from the ratchet end; and d) a magnet fixed relative to the disk member and opposing the tail end of the pawl for urging the ratchet end of the pawl into engagement with the ratchet wheel. 27. The clutch according to claim 26 wherein, when the pawl is engaging the ratchet wheel, the magnet is spaced from the pawl for preventing contact therebetween. 28. The clutch according to claim 27, wherein the spacing between the pawl and the magnet is at least approximately 1 mm. 29. A ratchet overrunning clutch comprising: a) a ratchet wheel; b) a disk member; c) a plurality of pawls, each pawl being rotationally supported by the disk member and having a ratchet end for engagement with the ratchet wheel and a tail end extending oppositely from the ratchet end; and d) a permanent magnet fixed relative to the disk member and opposing the tail end of the pawl for urging the ratchet end of the pawl into engagement with the ratchet wheel, wherein the clutch further includes a mounting sleeve embedded in the disk member, the permanent magnet being supported in the mounting sleeve. 30. The clutch according to claim 29, wherein the mounting sleeve is made of a non-magnetic material for blocking magnetic lines of force into the disk member, thereby enhancing utilization of the magnetic force to drive the pawl.
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이 특허에 인용된 특허 (5)
Sampietro Joseph M. (Tarzana CA) Moghadam Hossein M. (Camarillo CA) Fard Anoush M. (Agoura Hills CA) Krum Richard G. (Thousand Oaks CA), Magnetic carriage latch for a disc drive.
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