IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0988661
(2009-05-07)
|
등록번호 |
US-8267802
(2012-09-18)
|
우선권정보 |
JP-2008-142386 (2008-05-30); JP-2008-142402 (2008-05-30) |
국제출원번호 |
PCT/JP2009/058605
(2009-05-07)
|
§371/§102 date |
20101020
(20101020)
|
국제공개번호 |
WO2009/145035
(2009-12-03)
|
발명자
/ 주소 |
- Kobayashi, Tomoshige
- Yamazaki, Kenta
- Fujio, Teruaki
|
출원인 / 주소 |
|
대리인 / 주소 |
Wenderoth, Lind & Ponack, L.L.P.
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
9 |
초록
▼
A fixed type constant velocity universal joint is capable of securing a ball groove depth larger than conventional products and enhancing performance without an increase in a “force of pushing out balls in an axial direction”, the force having an influence on joint efficiency. In the fixed type cons
A fixed type constant velocity universal joint is capable of securing a ball groove depth larger than conventional products and enhancing performance without an increase in a “force of pushing out balls in an axial direction”, the force having an influence on joint efficiency. In the fixed type constant velocity universal joint, a center of each of a plurality of guide grooves of an outer joint member and a center of each of a plurality of guide grooves of an inner joint member are offset with respect to a spherical surface center of an inner surface and a spherical surface center of an outer surface. A ratio (F/PCR) of an offset amount F to a length of a segment (PCR) ranges from 0.045 to 0.065. A ratio (αt/α) when an angle α is the total of an angle αt and an angle αc ranges from 0.45 to 0.65.
대표청구항
▼
1. A fixed type constant velocity universal joint, comprising: an outer joint member having an inner surface in which a plurality of guide grooves are formed;an inner joint member having an outer surface in which a plurality of guide grooves are formed;a plurality of balls interposed between the plu
1. A fixed type constant velocity universal joint, comprising: an outer joint member having an inner surface in which a plurality of guide grooves are formed;an inner joint member having an outer surface in which a plurality of guide grooves are formed;a plurality of balls interposed between the plurality of guide grooves of the outer joint member and the plurality of guide grooves of the inner joint member, for transmitting torque; anda retainer for retaining the plurality of balls,wherein a center of curvature of each of the plurality of guide grooves of the outer joint member and a center of curvature of each of the plurality of guide grooves of the inner joint member are offset to opposite sides of a joint center along a central axis of the fixed type constant velocity universal joint by equal distances, the center of curvature of each of the plurality of guide grooves of the outer joint member being offset from and on a same side of the joint center as a spherical surface center of an outer surface of the retainer, and the center of curvature of each of the plurality of guide grooves of the inner joint member being offset from and on a same side of the joint center as a spherical surface center of an inner surface of the retainer,wherein R1 representing F/PCR falls within a range of 0.045≦R1≦0.065, F being a track offset amount that is a distance between the center of curvature of each of the plurality of guide grooves of the outer joint member and the spherical surface center of the outer surface of the retainer or between the center of curvature of each of the plurality of guide grooves of the inner joint member and the spherical surface center of the inner surface of the retainer, andPCR being a length of a line connecting the center of curvature of each of the plurality of guide grooves of the outer joint member or the center of curvature of each of the plurality of guide grooves of the inner joint member and a center of each of the plurality of balls to each other, andwherein As representing αt/α falls within a range of 0.45≦As≦0.65, αt being an angle formed between: a line connecting the spherical surface center of the outer surface of the retainer or the spherical surface center of the inner surface of the retainer and the center of each of the plurality of balls to each other; andthe line connecting the center of curvature of each of the plurality of guide grooves of the outer joint member or the center of curvature of each of the plurality of guide grooves of the inner joint member and the center of each of the plurality of balls to each other, respectively,αc being an angle formed between: the line connecting the spherical surface center of the outer surface of the retainer or the spherical surface center of the inner surface of the retainer and the center of each of the plurality of balls to each other; anda line connecting the joint center and the center of each of the plurality of balls to each other, anda sum of αt and αc being α. 2. A fixed type constant velocity universal joint according to claim 1, wherein contact angles between the plurality of guide grooves of the outer and inner joint members and each of the plurality of balls are set to range from 33° to 38°. 3. A fixed type constant velocity universal joint according to claim 2, wherein a surface of each of the plurality of balls has fine-recess-shaped depressions provided therein. 4. A fixed type constant velocity universal joint according to claim 3, wherein groove surfaces of the plurality of guide grooves of the inner joint member have fine-recess-shaped depressions provided therein. 5. A fixed type constant velocity universal joint according to claim 2, wherein groove surfaces of the plurality of guide grooves of the inner joint member have fine-recess-shaped depressions provided therein. 6. A fixed type constant velocity universal joint according to claim 2, wherein groove surfaces of the plurality of guide grooves of the outer joint member have fine-recess-shaped depressions provided therein. 7. A fixed type constant velocity universal joint according to claim 1, wherein a surface of each of the plurality of balls has fine-recess-shaped depressions provided therein. 8. A fixed type constant velocity universal joint according to claim 7, wherein a surface roughness Ra of the surfaces of the balls provided with the fine-recess-shaped depressions is set to range from 0.03 to 1.0 μm,wherein a skewness degree as a SK value of a surface roughness parameter is set to −1.6 or less for the surfaces provided with the fine-recess-shaped depressions, andwherein an area rate of the fine-recess-shaped depressions is set to range from 10 to 30%. 9. A fixed type constant velocity universal joint according to claim 7, wherein a surface roughness Ra of the surfaces of the balls provided with the fine-recess-shaped depressions is set to range from 0.05 to 0.15 μm, andwherein a skewness degree as a SK value of a surface roughness parameter is set to −4.9 to −1.6 for the surfaces provided with the fine-recess-shaped depressions. 10. A fixed type constant velocity universal joint according to claim 7, wherein the surfaces of the balls provided with the fine-recess-shaped depressions are finished by barrel polishing. 11. A fixed type constant velocity universal joint according to claim 7, wherein the surfaces of the balls provided with the fine-recess-shaped depressions are finished by shot blasting. 12. A fixed type constant velocity universal joint according to claim 7, wherein the surfaces of the balls provided with the fine-recess-shaped depressions are finished by shot peening. 13. A fixed type constant velocity universal joint according to claim 7, wherein groove surfaces of the plurality of guide grooves of the inner joint member have fine-recess-shaped depressions provided therein. 14. A fixed type constant velocity universal joint according to claim 7, wherein groove surfaces of the plurality of guide grooves of the outer joint member have fine-recess-shaped depressions provided therein. 15. A fixed type constant velocity universal joint according to claim 1, wherein groove surfaces of the plurality of guide grooves of the inner joint member have fine-recess-shaped depressions provided therein. 16. A fixed type constant velocity universal joint according to claim 1, wherein groove surfaces of the plurality of guide grooves of the outer joint member have fine-recess-shaped depressions provided therein. 17. A fixed type constant velocity universal joint according to claim 1, wherein a surface of each of the plurality of balls, groove surfaces of the plurality of guide grooves of the inner joint member, and groove surfaces of the plurality of guide grooves of the outer joint member have fine-recess-shaped depressions provided therein. 18. A fixed type constant velocity universal joint according to claim 1, wherein the fixed type constant velocity universal joint is an undercut-free type and each of the plurality of guide grooves of the outer and inner joint members has a groove bottom that is provided with a circular-arc portion and a straight portion. 19. A fixed type constant velocity universal joint according to claim 1, wherein the fixed type constant velocity universal joint is a Rzeppa type and each of the plurality of guide grooves of the outer and inner joint members has a groove bottom that is constituted only by a circular-arc portion. 20. A fixed type constant velocity universal joint according to claim 1, comprising a fixed type constant velocity universal joint to be used for a propeller shaft for automobiles.
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