IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0505763
(2010-11-25)
|
등록번호 |
US-8684849
(2014-04-01)
|
우선권정보 |
JP-2009-268907 (2009-11-26); JP-2010-261532 (2010-11-24) |
국제출원번호 |
PCT/JP2010/070985
(2010-11-25)
|
§371/§102 date |
20120503
(20120503)
|
국제공개번호 |
WO2011/065400
(2011-06-03)
|
발명자
/ 주소 |
- Sone, Keisuke
- Ooba, Hirokazu
- Yoshida, Kazuhiko
- Itou, Kiyohiro
|
출원인 / 주소 |
|
대리인 / 주소 |
Wenderoth, Lind & Ponack, L.L.P.
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
3 |
초록
▼
An eight-ball fixed type constant velocity universal joint of an undercut free type is capable of increasing a torque capacity at high operating angles while securing durability at low operating angles. When a distance between a center of a track groove and a center of a ball is denoted by Rt, and w
An eight-ball fixed type constant velocity universal joint of an undercut free type is capable of increasing a torque capacity at high operating angles while securing durability at low operating angles. When a distance between a center of a track groove and a center of a ball is denoted by Rt, and when an axial distance between the center of the track groove and a joint center plane is denoted by F, a ratio R1 of F to Rt is set to fall within a range of 0.061≦R1≦0.087. When a radial offset amount, which is a distance between the center of the track groove and a joint center axial line is denoted by fr, a ratio R3 of fr to Rt is set to fall within a range of 0.07≦R3≦0.19. When an effective cured-layer depth with Hv 513 is denoted by Di and the diameter of the ball is denoted by d, a bottom surface of a track groove of an inner joint member includes a cured layer with an effective cured-layer depth ratio Di/d of at least 0.111 or more.
대표청구항
▼
1. A fixed type constant velocity universal joint, comprising: an outer joint member having an inner surface in which eight track grooves extending in an axial direction are formed;an inner joint member having an outer surface in which eight track grooves extending in the axial direction are formed;
1. A fixed type constant velocity universal joint, comprising: an outer joint member having an inner surface in which eight track grooves extending in an axial direction are formed;an inner joint member having an outer surface in which eight track grooves extending in the axial direction are formed;eight ball tracks formed by cooperation of the eight track grooves of the outer joint member and the eight track grooves of the inner joint member corresponding to the eight track grooves of the outer joint member;eight torque transmitting balls arranged respectively in the eight ball tracks; anda cage comprising pockets for respectively holding the eight torque transmitting balls,the fixed type constant velocity universal joint comprising an undercut free type fixed type constant velocity universal joint, in which a bottom surface of each of the eight track grooves of the outer joint member and a bottom surface of each of the eight track grooves of the inner joint member each comprise a curved portion and a straight portion,wherein, under a state in which an operating angle of the fixed type constant velocity universal joint is 0°, when a straight line comprising an axial line of the outer joint member and an axial line of the inner joint member is defined as a joint center axial line, and when a plane which comprises respective centers of the eight torque transmitting balls and is orthogonal to the joint center axial line is defined as a joint center plane, a center of each of the eight track grooves of the outer joint member and a center of each of the eight track grooves of the inner joint member are offset respectively to positions spaced apart from the joint center plane respectively toward both axial sides and spaced apart from the joint center axial line respectively toward radially opposite sides with respect to corresponding one of the eight track grooves of the outer joint member and corresponding one of the eight track grooves of the inner joint member, respectively,wherein a center of a spherical outer surface of the cage is arranged on the center side of each of the eight track grooves of the inner joint member with respect to the joint center plane,wherein a center of a spherical inner surface of the cage is arranged on the center side of each of the eight track grooves of the outer joint member with respect to the joint center plane,wherein, when an axial distance from the center of the spherical outer surface of the cage or the center of the spherical inner surface of the cage to the joint center plane is denoted by fc, and when a distance from the center of corresponding one of the eight torque transmitting balls to the joint center axial line is denoted by R, a ratio R2 of fc to R (=fc/R) is 0.01 or less,wherein, when a distance between the center of each of the eight track grooves of the outer joint member or the center of each of the eight track grooves of the inner joint member and the center of corresponding one of the eight torque transmitting balls is denoted by Rt, and when an axial distance between the center of each of the eight track grooves of the outer joint member or the center of each of the eight track grooves of the inner joint member and the joint center plane is denoted by F, a ratio R1 of F to Rt (=F/Rt) falls within a range of 0.044≦R1≦0.087,wherein, when a radial offset amount, which is a distance from the center of each of the eight track grooves of the outer joint member or the center of each of the eight track grooves of the inner joint member to the joint center axial line, is denoted by fr, a ratio R3 of fr to Rt (=fr/Rt) falls within a range of 0.07≦R3≦0.19, andwherein, when an effective cured-layer depth with Hv 513 is denoted by Di and a diameter of each of the eight torque transmitting balls is denoted by d, the bottom surface of each of the eight track grooves of the inner joint member comprises a cured layer with an effective cured-layer depth ratio Di/d of at least 0.111 or more. 2. A fixed type constant velocity universal joint according to claim 1, wherein the ratio R1 of F to Rt (=F/Rt) is set to 0.071 or less. 3. A fixed type constant velocity universal joint according to claim 1, wherein the ratio R3 of fr to Rt (=fr/Rt) is set to 0.15 or more. 4. A fixed type constant velocity universal joint according to claim 1, wherein, when an effective cured-layer depth with Hv 600 is denoted by Dc and the diameter of each of the eight torque transmitting ball is denoted by d, the cage has an effective cured-layer depth ratio Dc/d of at least 0.067 or more, and has an ungrinded surface free from a soft layer having hardness smaller than hardness of a surface of a grinded portion. 5. A fixed type constant velocity universal joint according to claim 1, wherein, along an opening end of the inner surface of the outer joint member, cut portions for inserting the cage are provided at at least two points symmetrical with each other with respect to an axial center. 6. A fixed type constant velocity universal joint according to claim 1, wherein the outer joint member comprises a mouth portion provided with the eight track grooves, the mouth portion comprising a chamfer for allowing formation of an operating angle, the chamfer radially expanding toward an opening side of the outer joint member and being formed at an opening end portion of the mouth portion,wherein, when a projecting amount of the opening end portion of the mouth portion from an intersection of the chamfer and a groove bottom of corresponding one of the eight track grooves of the outer joint member is denoted by t, and when the diameter of each of the eight torque transmitting ball is denoted by d, a relationship of t=0.13 d to 0.185 d is satisfied, andwherein an uncured layer that has not undergone curing treatment exists from the opening end surface of the mouth portion to an outer peripheral surface of the mouth portion, which is continuous with the opening end surface. 7. A fixed type constant velocity universal joint according to claim 1, which is used for coupling of a drive shaft of an automobile.
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