One-way clutch and torque detection apparatus using same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16D-041/30
G01L-003/14
출원번호
US-0380859
(2001-10-10)
우선권정보
JP-0313893 (2000-10-13)
국제출원번호
PCT/JP01/08875
(2003-03-18)
§371/§102 date
20030318
(20030318)
국제공개번호
WO02/33279
(2002-04-25)
발명자
/ 주소
Yoshiie, Akihito
Kokatsu, Kyosuke
출원인 / 주소
Sunstar Suisse SA
대리인 / 주소
Wenderoth, Lind &
인용정보
피인용 횟수 :
2인용 특허 :
4
초록▼
A power-assisted bicycle is provided with a one-way clutch that can also be used as a torque detection apparatus. The one-way clutch has a tooth part (112) mounted on a driven means and a piece part (100) mounted slidably yet non-rotatably on a drive shaft (4). The tooth part has a first engagement
A power-assisted bicycle is provided with a one-way clutch that can also be used as a torque detection apparatus. The one-way clutch has a tooth part (112) mounted on a driven means and a piece part (100) mounted slidably yet non-rotatably on a drive shaft (4). The tooth part has a first engagement face (121) formed with a plurality of teeth (114) and the piece part has a second engagement face (110) formed with a plurality of pieces (102). The first engagement face and the second engagement face are disposed facing each other generally perpendicularly to the axial direction. A disc spring (124) is disposed on the rear face of the piece part. As the piece part rotates in the direction of running forward, the piece is engaged with a sharply sloping face of the tooth to engage with the tooth and the angle of the piece with respect to the second engagement face increases, whereby the piece slides so as to increase the distance from the tooth part in resistance to the disc spring. As the piece rotates in the opposite direction, the piece abuts with the gently sloping face of the tooth and the angle of the piece with respect to the second engagement face is made smaller to decrease the distance from the tooth part by means of the elasticity of the disc spring.
대표청구항▼
1. A one-way clutch for transmitting only one-way rotation about an axial direction thereof; said one-way clutch comprising:a first member having a first engagement face formed with a plurality of teeth, and a second member having a second engagement face formed with a plurality of pieces, said firs
1. A one-way clutch for transmitting only one-way rotation about an axial direction thereof; said one-way clutch comprising:a first member having a first engagement face formed with a plurality of teeth, and a second member having a second engagement face formed with a plurality of pieces, said first and second members being disposed in a series along said axial direction; wherein each of said teeth comprises a sharply sloping face and a gently sloping face with respect to said first engagement face; each of said pieces is mounted on said second member so that the angle in the lengthwise direction thereof with respect to said second engagement face is variable; each of said pieces is engaged with the sharply sloping faces of the teeth to prevent relative rotation between said first and second members and the angle of each of said pieces with respect to said second engagement face increases causing the first and second members to move away from each other, resisting elasticity, when either one of said first member or said second member is rotated in said one-way rotation; and each of said pieces comes into abutment with the gently sloping face of said tooth to enable the relative rotation between said first and second members and the angle of each of said pieces with respect to said second engagement face decreases causing the first and second members to move closer to each other by the elasticity, when either one of said first member or said second member is rotated in a direction opposite to said one-way rotation. 2. The one-way clutch as claimed in claim 1, wherein each of said pieces is made from a rigid member and disposed so as for the lengthwise direction thereof to elastically pivot about a direction at a given angle with respect to said second engagement face.3. The one-way clutch as claimed in claim 2, wherein each of said pieces comprises a rotary shaft portion and an engagement portion, said rotary shaft portion being pivotally disposed within a depression provided on said second member and said engagement portion extending from said rotary shaft portion to engage with said teeth.4. The one-way clutch as claimed in claim 3, wherein each of said pieces has a flat portion on a side face of said rotary shaft portion and each of said pieces is permitted to pivot elastically by allowing an elastic member to abut with the flat portion of said piece.5. The one-way clutch as claimed in claim 4, wherein said elastic member is in the form of a bar and can be accommodated in a groove formed in said second member in a position adjacent to said depression of each of said pieces.6. The one-way clutch as claimed in claim 5, wherein said elastic member comprises a first end portion bent at a generally right angle and a second end portion bent in an angularly C-shaped form.7. The one-way clutch as claimed in claim 1, wherein either one of said first member and said second member is disposed so as to be slidable along said axial direction and to be capable of being mounted on a drive system through a rotation-preventive system for preventing a rotation relative to the drive system; and the other of said first member and said second member is capable of being connected to a driven system.8. The one-way clutch as claimed in claim 7, wherein either one of said first member or said second member, mounted slidably in said axial direction through said rotation-preventive system, is supported so that an elastic unit abuts with a rear face thereof opposite to the engagement face thereof and the elasticity is provided by the elastic unit.9. The one-way clutch as claimed in claim 8, wherein said elastic unit is in a generally flat form having a length in the axial direction thereof shorter than a length in the radial direction thereof.10. The one-way clutch as claimed in claim 9, wherein said elastic unit comprises a disc spring.11. The one-way clutch as claimed in claim 9, wherein the rear face of either one of said first member or said second member abuttable with said elastic unit is provided with a bearing for loading and rotating-sliding.12. The one-way clutch as claimed in claim 11, wherein said bearing comprises a plurality of steel balls forced rotatably in a circular groove formed in the rear face thereof.13. The one-way clutch as claimed in claim 9, wherein, when a torque generated by said one-way rotation is lower than a given value, an offset elastic member is interposed between the rear face thereof and said elastic unit to deviate either one of said first member or said second member so as to create a clearance between the rear face thereof and said elastic unit.14. The one-way clutch as claimed in claim 7, wherein said rotation-preventive system comprises a ball spline.15. The one-way clutch as claimed in claim 14, wherein either one of said first member or said second member mounted slidably in said axial direction is provided with a bore for accommodating a rotary shaft to produce a torque by said one-way rotation.16. The one-way clutch as claimed in claim 15, wherein said rotation-preventive system comprises one or plural rows of first grooves formed in an inner wall of the bore and extending in said axial direction, one or plural rows of second grooves formed in the rotary shaft so as to face said first grooves and extending in said axial direction, and steel balls to be accommodated in the first grooves and the second grooves.17. The one-way clutch as claimed in claim 15, wherein said rotation-preventive system comprises one or plural rows of first grooves formed in an inner wall of the bore and extending in said axial direction, one or plural rows of second grooves formed in said rotary shaft so as to face the first grooves and extending in said axial direction, and plates to be accommodated in the first grooves and the second grooves.18. The one-way clutch as claimed in claim 15, wherein said rotation-preventive system comprises one or plural rows of grooves formed in an inner wall of the bore and extending in said axial direction, and one or plural rows of protruding portions formed in said rotary shaft so as to be accommodated in the grooves.19. The one-way clutch as claimed in claim 15, wherein said rotation-preventive system comprises one or plural rows of protruding portions formed in an inner wall of the bore and extending in said axial direction and one or plural rows of grooves formed in said rotary shaft so as to accommodate the grooves.20. The one-way clutch as claimed in claim 15, wherein said rotation-preventive system comprises a plate member extending over the entire length of the diameter of the bore and connecting an inner wall of the bore and a through groove extending in the shaft along said axial direction.21. A torque detection apparatus comprising a one-way clutch for transmitting only a one-way rotation about an axial direction and capable of detecting a torque by said one-way rotation, wherein:said one-way clutch converts at least a portion of a stress generated inside said clutch by said one-way rotation into a stress in said axial direction to resist elasticity; and a detection system for detecting the stress in said axial direction as a torque is further provided. 22. The torque detection apparatus as claimed in claim 21, wherein:said one-way clutch comprises a first member and a second member disposed in a series along said axial direction; when either one of said first member or said second member implements said one-way direction, said first member and said second member are engaged with each other to halt the relative rotation between said first member and said second member and said first member and said second member are caused to separate from each other in said axial direction in resistance to the elasticity; and when either one of said first member or said second member rotates in a direction opposite to said one-way direction, said first member and said second member are disengaged from each other to enable the relative rotation between said first member and said second member and said first member and said second member are caused to move closer to each other in said axial direction with the aid of the elasticity. 23. The torque detection apparatus as claimed in claim 22, wherein:said first member has a first engagement face formed with a plurality of teeth and said second member has a second engagement face formed with a plurality of pieces; said first engagement face and said second engagement face are disposed facing each other generally perpendicularly to said axial direction; each of said pieces is engaged between the adjacent teeth to perform the engagement with said teeth when either one of said first member or said second member is rotated in said one-way direction of rotation; and each of said pieces is disengaged from said teeth to release the engagement of said pieces with said teeth when either one of said first member or said second member is rotated in a direction opposite to said one-way direction of rotation. 24. The torque detection apparatus as claimed in claim 23, wherein:each of said teeth comprises a sharply sloping face and a gently sloping face with respect to said first engagement face; each of said pieces is mounted on said second member so that the angle in the lengthwise direction thereof with respect to said second engagement face is variable; each of said pieces is engaged with the sharply sloping faces of the teeth to perform the engagement with said teeth and the angle of each of said pieces with respect to said second engagement face increases, when either one of said first member or said second member is rotated in said one-way direction of rotation; and each of said pieces comes into abutment with the gently sloping face of said tooth and the angle of each of said pieces with respect to said second engagement face decreases, when either one of said first member or said second member is rotated in the direction opposite to said one-way direction of rotation. 25. The torque detection apparatus as claimed in claim 24, wherein each of said pieces is made from a rigid member and disposed so that the lengthwise direction thereof elastically pivots about a given angle with respect to said second engagement face.26. The torque detection apparatus as claimed in claim 25, wherein each of said pieces comprises a rotary shaft portion and an engagement portion, said rotary shaft portion being pivotally disposed within a depression provided on said second member and said engagement portion extending from said rotary shaft portion to engage with said teeth.27. The torque detection apparatus as claimed in claim 26, wherein each of said pieces has a flat portion on a side face of said rotary shaft portion and each of said pieces is permitted to pivot elastically by allowing an elastic member to abut with the flat portion of each of said pieces.28. The torque detection apparatus as claimed in claim 27, wherein said elastic member is in the form of a bar and can be accommodated in a groove formed in said second member in a position adjacent to said depression of each of said pieces.29. The torque detection apparatus as claimed in claim 28, wherein said elastic member comprises a first end portion bent at a generally right angle and a second end portion bent in an angularly C-shaped form.30. The torque detection apparatus as claimed in any one of claim 22, wherein either one of said first member or said second member is disposed so as to be slidable along said axial direction and to be mountable on a drive system through a rotation-preventive system for preventing a rotation relative to the drive system; and the other of said first member and said second member is connectable to a driven system.31. The torque detection apparatus as claimed in claim 30, wherein either one of said first member or said second member mounted slidably in said axial direction through said rotation-preventive system is supported so that an elastic unit abuts with a rear face thereof opposite to the engagement face thereof and the elasticity is provided by the elastic unit.32. The torque detection apparatus as claimed in claim 31, wherein said elastic unit is in a generally flat form having a length in an axial direction thereof shorter than a length in a radial direction thereof.33. The torque detection apparatus as claimed in claim 32, wherein said elastic unit comprises a disc spring.34. The torque detection apparatus as claimed in claim 33, wherein said detection system detects a stress deformation of said elastic unit.35. The torque detection apparatus as claimed in claim 34, wherein said detection system is provided with a plurality of deformation sensors mounted at plural locations of said elastic unit and detects the torque on the basis of an average value of the output signals of said plurality of deformation sensors.
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이 특허에 인용된 특허 (4)
Kanehisa, Takanori; Kirimoto, Kanji, Bicycle hub with tight connection ratchet and detachable freewheel.
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