JP2009507195A - Counter track joint with limited axial movement - Google Patents

Abstract

  A ball constant velocity rotary joint (11) in the form of a counter track joint, the joint outer part (12) comprising a first outer ball track (16) and a second outer ball track (18); A joint inner portion (14) comprising a first inner ball track (17) and a second inner ball track (19) is provided, the first outer ball track (16) being A first track pair (16, 17) is formed together with the first inner ball track (17), and the first track pair (16, 17) extends in the first axial direction Ri1. (Α), the second outer ball track (18) and the second inner ball track (19) form a second track pair (18, 19), the second track Pair (18 19) extends in the second axial direction Ri2 (β), and a plurality of balls (20) are guided in both track pairs, and the ball center point Z of the balls (20) is the joint center. A ball cage (21) provided with a plurality of cage windows (22) distributed in the circumferential direction is provided at the rolling circle radius PCR centered on the point M, and the ball cage (21 The ball (20) is held in one common plane E and is guided to a plane that bisects the angle when the joint is bent, and the joint outer portion (12) Relative axial movement between the ball cage (21) and between the ball cage (21) and the joint inner part (14), between the joint outer part (12) and the joint inner part (14), respectively. S possible In the type in which the axial play is provided, the ratio between the axial play and the rolling circle radius PCR of the ball (20) is in the range of 0.01-0. This is a ball constant-velocity rotary joint, which is 09 (0.01 <S / PCR <0.09).

Description

  The present invention is a ball constant velocity rotary joint in the form of a counter track joint (Gegenbahngelenk), comprising a joint outer portion comprising a first outer ball track and a second outer ball track, a first inner And an inner joint portion with a second inner ball track, the first outer ball track forming a first track pair with the first inner ball track. The first track pair extends in the first axial direction Ri1, and the second outer ball track forms a second track pair with the second inner ball track. The second track pair extends in the second axial direction Ri2, the balls are guided in both the track pairs, and the ball center point Z of the balls A ball cage is provided that is positioned along the rolling circle radius PCR around the center point M, and further includes a plurality of cage windows distributed in the circumferential direction, and the ball is placed in the ball cage, It is held in one common plane E and is guided to a plane that bisects the angle when the joint is bent, and between the joint outer portion and the ball cage and between the ball cage and the joint inner portion. Between the joint outer part and the joint inner part, respectively, with an axial play allowing a relative axial movement S.

  Such a type of joint is described in German Offenlegungsschrift 10060120. In this case, it is assumed that the axial travel distance can be limited in relation to the control angle produced. This type of joint is suitable for blocking axial vibrations at intermediate axial positions, thereby blocking small vibrations in the power train. However, during the axial movement under the torque load, an axial force is formed, and transmission of axial vibration can occur again. If the axial movement distance is excessively large, the effect of having no axial force or the effect of having little axial force is lost.

  Therefore, the problem underlying the present invention is to improve a ball constant velocity rotary joint of the type described at the outset so that only a small axial force is formed within the permitted range of movement, so that the joint is powered. It is to provide a ball constant velocity rotary joint that can be effective for vibration isolation in a train.

  The solution to the above problem is that, in the joint of the type described at the beginning, the ratio between the axial play S and the rolling circle radius PCR of the ball (20) is 0.01 to The ball constant velocity rotary joint is characterized by 0.09 (0.01 <S / PCR <0.09). If this axial travel distance associated with the joint size is maintained, it is avoided that the axial resultant force is excessively increased in the working range of the joint.

  In an advantageous configuration of the invention, the ratio between the axial play S and the rolling circle radius PCR of the ball is respectively below 0.05 (S / PCR <0. 05). The axial force is particularly low when the difference between the opening angles of the track pairs is relatively small. Accordingly, each of the opening angles of the first track pair or the second track pair at the end position of the relative axial movement between the joint outer part and the joint inner part in the extended state of the joint. It is proposed that the smaller opening angle α or β is smaller than 8 ° (α <8 ° ∨β <8 °). Relative axial direction between the joint outer portion and the joint inner portion in which the opening angles α and β of the first track pair and the second track pair are equal to each other in the extended state of the joint When the double opening angles α and β are smaller than 8 ° (α <8 ° ∧β <8 °) at the intermediate position of movement, that is, the center position, a further reduction in the opening angle of the track pair is achieved. be able to.

  In this case, in a particularly advantageous configuration of the invention, the inner surface of the joint outer part, the outer surface of the joint inner part and the outer and inner surfaces of the ball cage are each a ball segmentation surface and the radius between the joint outer part and the ball cage Directional play COR and radial play CIR between the ball cage and the inner part of the joint are 0.015 to 0.20 mm, respectively. As a result, precise production of the joint can be avoided. This is because such a joint does not have a guiding function, but a corresponding surface that only serves as an axial stopper can be easily produced by deformation or simple turning operations.

  In particular, in the outer part of the joint, the inner spherical guide surface for the ball cage is exclusively soft-turned and finally hardened after deformation with the required increment for mechanical processing In contrast, the ball track is only hardened and ground after deformation. Curing or quenching of the guide surface and the ball track can be performed inductively in a single process.

  According to another advantageous dimensional setting, the radial play BO of the balls in the track pair is between −0.03 mm (press fit) and 0.08 mm (play fit). This value region as well as the value range given above applies to the universal size for all joints for the automotive field.

  Advantageous track designs of the counter track joints characterized in this way are described in claims 8 to 13.

  That is, in an advantageous embodiment of the track design, the track center line M16 of the first outer ball track has an arc having a radius R2 at the center, the arc center point O2 being Is displaced from the center plane E of the joint by a predetermined axial offset, and the track center line M16 of the first outer ball track follows the arc in the first direction. The track center line M17 of the first inner ball track gradually deviates radially inward from R2, and has an arc having a radius R2 'at the center, and the center point O2 of the arc. ′ Is shifted from the center plane E of the joint in the second direction by a predetermined axial offset, and following the arc, the track center line M1 of the first inner ball track 7 is gradually biased radially inward from the radius R2 ′ in the second direction.

  In this case, advantageously, the track centerline M16 of the first outer ball track has an arc with a smaller radius R3, following the arc with the radius R2 in the first direction and having the same direction of curvature. The arc continues smoothly with an arc having a radius R2, and the track center line M17 of the first inner ball track continues in the second direction to the arc with a radius R2 ' It has an arc with a smaller radius R3 ′ having a curved direction, the arc smoothly following an arc with a radius R2 ′.

  In a further advantageous embodiment, the track centerline M16 of the first outer ball track follows in an arc having a radius R2 in a second direction and is gradually offset radially outward from the radius R2. Then, the track center line M17 of the first inner ball track follows the arc having the radius R2 'in the first direction, and is gradually deviated radially outward from the radius R2'.

  In a particularly advantageous embodiment, the track centerline M16 of the first outer ball track has an arc having a radius R1 with a reverse direction of curvature followed by an arc having a radius R2 in a second direction. The arc smoothly follows an arc having a radius R2, the center point O1 of which is located outside the circle drawn by the radius R2 centered on the center point O2, The track center line M17 of the inner ball track has an arc having a radius R1 'having a reverse direction of curvature followed by an arc having a radius R2' in a first direction, the arc having a radius Smoothly following the arc having R2 ′, the center point O1 ′ is located outside the circle drawn by the radius R2 ′ centered on the center point O2 ′.

  In another advantageous embodiment of the track design, the track center line M18 of the second outer ball track has an arc with a radius R5 in the middle, the center point O5 of the arc being the second Is displaced from the center plane E of the joint by a predetermined axial offset, and the track centerline M18 of the second outer ball track following the arc is the second direction in the second direction. The track center line M19 of the second inner ball track gradually deviates radially outward from the radius R5, and has an arc having a radius R5 ′ at the center, and the center point of the arc O5 'is positioned offset from the center plane E of the joint by a predetermined axial offset in the first direction, and the track center of the second inner ball track following the arc. The line M19 is gradually deviated radially outward from the radius R5 ′ in the first direction.

  In this case, advantageously, the track centerline M18 of the second outer ball track has an arc having a radius R4 with a reverse direction of curvature followed by an arc having a radius R5 in a second direction. The arc smoothly follows an arc having a radius R5, the center point O4 of which is located outside the circle drawn by the radius R5 centered on the center point O5, The track center line M19 of the inner ball track has an arc having a radius R4 'having a reverse direction of curvature followed by an arc having a radius R5' in a first direction, the arc having a radius Smoothly following the arc having R5 ′, the center point O4 ′ is located outside the circle drawn by the radius R5 ′ centered on the center point O5 ′.

  As a result, a large bending angle is possible, and even at such a large bending angle, good control of the ball by the track force and thus good control of the joint can be maintained without considering the axial movement position. That is ensured. The track design has heretofore been proposed only for fixed ball constant velocity rotary joints without axial movement (German Patent Application No. 10337612).

  The joint can advantageously be formed using 6 balls or 8 balls.

  In the following, advantageous embodiments of the invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of a counter track joint according to the invention with six balls,
a) Longitudinal section of a ball track located opposite each other along a flat section line;
b) Development view of the ball cage,
c) Longitudinal section taken along a bent section line through one cage window and one cage web,
d) a view in the form of an enlarged detail of a part of c) above;
FIG. 2 shows the counter track joint according to the first embodiment shown in FIG.
a) Longitudinal section of a ball track located opposite each other along a flat section line;
b) Development view of the ball cage,
c) view in the form of a longitudinal section taken along a bent section line through one cage window and one cage web;
FIG. 3 is a longitudinal sectional view of the counter track joint according to the first embodiment shown in FIGS. 1 and 2 taken along a bent section line passing through one cage window and one cage web.
a) a first position moved maximum in the axial direction;
b) Intermediate position or center position in the axial direction,
c) a second position moved maximum in the axial direction;
d) a view shown in part enlarged detail of b) above;
FIG. 4 is a longitudinal sectional view of the counter track joint according to the first embodiment shown in FIGS. 1 to 3 taken along a bent section line passing through one cage window and one cage web. A) the first position moved maximum in the axial direction,
b) Intermediate position or center position in the axial direction,
c) the second position moved maximum in the axial direction;
5 shows the counter track joint according to the first embodiment shown in FIGS. 1 to 4, a) a diagram corresponding to b) of FIG. 3 and b) of FIG.
b) a diagram showing in enlarged detail of a part of a) above;
6 shows the counter track joint according to the first embodiment shown in FIGS. 1 to 5 a) a view corresponding to a) of FIG.
b) a diagram showing in enlarged detail of a part of a) above;
FIG. 7 shows a second embodiment of a counter track joint according to the invention having six balls and a special track shape a) longitudinal section,
b) a cross-sectional view;
FIG. 8 shows a third embodiment of a counter track joint according to the invention with a special track shape and eight balls a) Longitudinal section along line AA,
b) Longitudinal sectional view of the second track pair along line BB,
c) is an axial view;
FIG. 9 shows the counter track joint shown in FIG.
a) longitudinal section,
b) Detailed longitudinal sectional view of the outer part of the joint,
c) It is a figure shown with the detailed longitudinal cross-sectional view of a joint inner part.

Hereinafter, a), b) and c) of FIG. 1 will be described together. A counter track joint (opposite track joint) 11 according to the present invention includes a joint outer portion 12 having an integrally formed bottom portion 13, a joint inner portion 14 having a shaft 15 inserted therein, and a first track pair ( Track pair) and a second track pair. The first track pair consists of a first outer ball track 16 and a first inner ball track 17 which are bottom in the first axial direction Ri1 in the joint center plane E. It is open toward 13. The second track pair consists of a second outer ball track 18 and a second inner ball track 19 which are shafts in the second axial direction Ri2 in the joint center plane E. It is open towards 15. A plurality of first track pairs and second track pairs are distributed over the entire circumference of the joint. The opening angle of the first track pair 16, 17 in the joint center plane E is indicated by “α”, and the opening angle of the second track pair 18, 19 in the joint center plane E is indicated by “β”. Yes. Within these track pair, the first ball 20 ₁ and the second ball 20 ₂ is fitted, these balls 20, the ball cage 21 having a plurality of cage windows 22 which are circumferentially distributed It is held in a common joint center plane E. Furthermore, the center axis A of the extended joint is shown, which intersects the joint center plane E at the joint center point M. During torque transmission, the first ball 20 _1, a force F1 is applied in a direction toward the bottom 13, the second ball 20 _2, a force F2 is applied in the direction towards the shaft 15. At the center position of the joint shown in the figure, the magnitudes of the two forces F1 and F2 are equal to each other based on the equal magnitudes of the two angles α and β. Therefore, the sum of all axial forces FC applied to the ball cage 21 is the same. Is equal to zero. As can be seen from FIGS. 1 c) and d), the ball cage 21 has a radial play both on the joint outer part 12 and on the joint inner part 14, thereby providing an axial play. Also have. In this case, the total axial play between the joint outer part 12 and the joint inner part 14 is indicated by “S”. In the illustrated embodiment, the joint outer portion 12 has a spherical inner surface 23 and the joint inner portion 14 has a spherical outer surface 24. Further, the ball cage 21 has a spherical outer surface 25 and a spherical inner surface 26.

2, the same components as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and these components are as described with reference to FIG. Hereinafter, a), b) and c) of FIG. 2 will be described together. In this case, the joint is shown in a position in which the joint inner part 14 is moved in the first direction by an axial movement distance S2 relative to the joint center plane E associated with the joint outer part 12. . Based on such movement, the opening angle α of the first track pair 16 and 17 becomes small, and the opening angle β of the second track pair 18 and 19 becomes large. Therefore, at the time of torque transmission, the axial force F1 acting on the first ball 20 ₁ decreases respectively, axial forces F2 acting on the second ball 20 ₂ increases, respectively. As a result, the sum of the axial forces FC is not equal to zero and is directed in the direction of the shaft 15. In this position, the cage and thus the joint as a whole can no longer be moved without axial force.

  In FIG. 3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. 1 and 2, and these components are the same as described above, so that detailed description will be given. Is omitted. FIG. 3b shows an axial sectional view of the joint at the axial center position shown in FIG. 1c). As can be seen from this enlarged detail view, the joint inner part 14 has axial play S1i, S2i with respect to the ball cage 21. Further, as can be seen from this enlarged detail view, the ball cage 21 has axial play S1o, S2o with respect to the joint outer portion 12. As can be seen from this, the maximum movement distance S1 in one direction shown in a) of FIG. 3 corresponds to the sum from the axial play S1i, S1o, and the reverse shown in c) of FIG. The maximum movement distance S2 in the direction is generated as the sum from S2i and S2o. In the terminal position, the ball cages 21 abut against the joint inner part 14 and / or the joint outer part 12, respectively. The total travel distance S is obtained as the sum from S1 and S2. In this case, S means the amount of movement of the joint inner portion 14 relative to the joint outer portion 12 from one stopper to the other stopper.

  4, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. 1 to 3, and these components are the same as described above, and detailed description thereof will be given. Is omitted. 4 a), b) and c) substantially correspond to a), b) and c) in FIG. In FIG. 4 b), the rolling circle radius PCR of the ball from the central axis A to the ball center point Z in the extended state of the joint is additionally written. It is stated that the range according to the invention for the structural ratio between the maximum travel distance S = S1 + S2 and the rolling circle radius PCR is 0.01 <S / PCR <0.09.

  5, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals as those in FIGS. 1 to 4, and these components are the same as described above, and detailed description thereof will be given. Is omitted. FIG. 5a corresponds to FIG. 4b). The enlarged detail shown in FIG. 5 b shows the radial play CIR between the outer spherical surface 24 of the joint inner part 14 and the inner spherical surface 26 of the ball cage 21 and the outer spherical surface 25 of the ball cage 21. And the radial play COR between the outer spherical surface 23 of the joint outer part 12 is shown. In this case, the magnitude range for the play is described as 0.015 <CIR <0.20 and 0.015 <COR <0.20, with these data values relating to millimeters, respectively.

In FIG. 6, the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals as those in FIGS. Is omitted. FIG. 6 a) corresponds to FIG. 4 b), in which case an enlarged detailed view is shown in FIG. 6 b). To b) of FIG. 6, the axial play BC balls 20 ₁ in the radial play BO and cage windows within 22 of the ball in the track pair 16, 18 have been described, in this case, the value of BC is -0.03 <BC <0.1 and the value of BO is described as -0.03 <BO <0.08, except that these data values are in millimeters, respectively. About.

  FIG. 7 shows a counter track joint according to the invention with six track pairs 16, 17; 18, 19, ie with six balls 20, in longitudinal and plan views. The first track pair and the second track pair are provided alternately over the entire circumference. The same components as those in FIGS. 1 to 6 are denoted by the same reference numerals as those in FIGS. 1 to 6, and detailed descriptions of these components are omitted because they are the same as described above.

  FIG. 8 shows a counter track joint according to the invention with eight balls 20, in which a) in FIG. 8 is a first section taken along the line AA in FIG. 8c). FIG. 8B is a longitudinal sectional view of the second track pair 18, 19 taken along line BB in FIG. 8C. The first track pair and the second track pair are alternately provided over the entire circumference. The same components as those in FIGS. 1 to 6 are denoted by the same reference numerals as those in FIGS. 1 to 6, and detailed descriptions of these components are omitted because they are the same as described above.

  FIG. 9 shows the joint shown in FIG. In this case, the details of the track center line of the ball track described below can be applied to the joint shown in FIG. A center line M16 of the illustrated first outer ball track 16 provided in the joint outer portion 12 is arranged axially offset toward the bottom with respect to the joint center plane E along the longitudinal axis A. A circular arc having a first radius R2 with a center point O2 and a continuous axially smooth, following the arc, the same axial offset as the central point O2 of the first radius R2 towards the bottom. The center point O3 has an arc having a radius R3 smaller than the first radius R2 and an arc having an opposing radius R1, and the center point O1 of the opposing radius R1 is relative to the joint center plane E. , Having an axial offset in the direction opposite to the center points O2 and O3 of the arc having radii R2 and R3, that is, toward the opening side, and Center O1 of 1 are located outside of the circle drawn with a radius R2 about a center point O2. As can be seen from the joint inner portion 14, the center line M 17 of the illustrated first inner ball track 17 is mirror-image-symmetrical with respect to the center line of the outer ball track 16 with the joint center plane E interposed therebetween, that is, the center point. The arcs having radii R2 ′, R3 ′, and R1 ′ centered on O2 ′, O3 ′, and O1 ′ are the same but symmetrically configured. The center line M18 of the second outer ball track 18 has an arc having a first radius R5 having a center point O5 at the longitudinal axis A, which is the center of the arc having a radius R2. It has an axial offset located in the direction opposite to the offset of the point O2, that is, toward the opening side.

  The arc having the radius R5 is followed by the arc having the opposing radius R4 toward the opening side. The center point O4 of this arc is located outside the circle drawn by the radius R5 having the center point O5 and has an axial offset with respect to the joint center plane E located in the same direction. As can be seen from the drawing, the center line M19 of the second inner ball track 19 provided in the joint inner portion 14 has a mirror-image characteristic with respect to the center line M18 of the second outer ball track 18. In other words, it is configured from a circular arc having radii R5 ′ and R4 ′ with the center points O5 ′ and O4 ′ as the center, but with a mirror image symmetry across the joint center plane E. The first outer ball track 16 and the first inner ball track 17 form an opening angle α shown in the figure that is open in the first direction Ri1 in the joint center plane E. The two outer ball tracks 18 and the second inner ball track 19 form an opening angle β opened in the opposite direction Ri2 in the joint center plane E. During the axial movement of such a ball constant velocity rotary joint according to the invention, which is made possible by cage play according to the invention, the double-opening angles change in opposite directions, in which case the joint is in a position without axial force. To a position where a return force is generated.

  The expression “axial offset” used above has the same meaning as “axial spacing” or “axial deviation”.

1) a first embodiment of a counter track joint according to the invention with six balls; a) a longitudinal section through a flat section line of a ball track located oppositely; b) a development of a ball cage; c) Longitudinal section taken along a bent section line passing through one cage window and one cage web, d) View in the form of an enlarged detail of a part of c) above. FIG. 1 shows the counter track joint according to the first embodiment shown in FIG. 1 in the axially moved position, a) a longitudinal sectional view of a ball track located opposite to each other along a flat section line, and b) a ball cage. FIG. 3c is a view in the form of a longitudinal section taken along a bent section line through one cage window and one cage web. In the longitudinal sectional view of the counter track joint according to the first embodiment shown in FIGS. 1 and 2 taken along a bent section line passing through one cage window and one cage web, a) in the axial direction A first position moved to the maximum; b) an intermediate position or center position in the axial direction; c) a second position moved to the maximum in the axial direction; d) an enlarged detail of a part of b) above. It is a figure shown by. In the longitudinal sectional view of the counter track joint according to the first embodiment shown in FIGS. 1 to 3 taken along a bent section line passing through one cage window and one cage web, supplementary dimensional data 4 is a diagram showing a) a first position moved to the maximum in the axial direction, b) an intermediate position or center position in the axial direction, and c) a second position moved to the maximum in the axial direction. . The counter track joint according to the first embodiment shown in FIGS. 1 to 4 is a) a view corresponding to FIG. 3 b) and FIG. 4 b), and b) a partially enlarged detail view of a) above. It is. FIG. 6 shows the counter track joint according to the first embodiment shown in FIGS. 1 to 5 a) a view corresponding to a) of FIG. 5 and b) a partially enlarged detail view of a). FIG. 3 shows a second embodiment of a counter track joint according to the invention with six balls and a special track shape, a) longitudinal section, b) transverse section. A third embodiment of a counter track joint according to the invention with a special track shape and eight balls a) longitudinal section along line AA, b) second track along line BB FIG. 2 is a longitudinal sectional view of a pair, and c) an axial view. FIG. 8 is a diagram showing the counter track joint shown in FIG. 7 in a) longitudinal sectional view, b) detailed longitudinal sectional view of the outer portion of the joint, and c) detailed longitudinal sectional view of the inner portion of the joint, along with the writing of the ball center line. is there.

Explanation of symbols

11 counter track joint 12 joint outer portion 13 bottom 14 joint inner portion 15 shaft 16 first outer ball track 17 first inner ball track 18 second outer ball track 19 second inner ball track 20 balls 21 Ball cage 22 Cage window 23 Inner spherical surface (12)
24 Outer spherical surface (14)
25 Outer spherical surface (21)
26 Inner spherical surface (21)

Claims (16)

A ball constant velocity rotary joint (11) in the form of a counter track joint, the joint outer part (12) comprising a first outer ball track (16) and a second outer ball track (18); A joint inner portion (14) comprising a first inner ball track (17) and a second inner ball track (19) is provided, the first outer ball track (16) being A first track pair (16, 17) is formed together with the first inner ball track (17), and the first track pair (16, 17) extends in the first axial direction Ri1. (Α), the second outer ball track (18) and the second inner ball track (19) form a second track pair (18, 19), the second track Pair (18 19) extends in the second axial direction Ri2 (β), and a plurality of balls (20) are guided in both track pairs, and the ball center point Z of the balls (20) is the joint center. A ball cage (21) provided with a plurality of cage windows (22) distributed in the circumferential direction is provided at the rolling circle radius PCR centered on the point M, and the ball cage (21 The ball (20) is held in one common plane E and is guided to a plane that bisects the angle when the joint is bent, and the joint outer portion (12) Relative axial movement between the ball cage (21) and between the ball cage (21) and the joint inner part (14), between the joint outer part (12) and the joint inner part (14), respectively. S possible In those forms in which the axial play that is provided,
The ratio between the axial play S and the rolling circle radius PCR of the ball (20) is 0.01 to 0.09 with the joint extended, respectively (0.01 <S / PCR <0. 09) A ball constant velocity rotary joint.   The ratio between the axial play S and the rolling circle radius PCR of the ball (20) is below 0.05 (S / PCR <0.05), respectively, with the joint extended. The ball constant velocity rotary joint according to 1.   The first track pair (16, 17) or second at the end position of the relative axial movement between the joint outer part (12) and the joint inner part (14) in the extended state of the joint. The ball according to claim 1 or 2, wherein the smaller opening angle α or β of the opening angles of the track pair (18, 19) is smaller than 8 ° (α <8 ° ∨β <8 °). Fast rotating joint.   The joint outer portion (12) in which the opening angles α and β of the first track pair (16, 17) and the second track pair (18, 19) are equal to each other in the extended state of the joint. At the intermediate or center position of relative axial movement between the joint inner part (14) and the double opening angles α and β are smaller than 8 ° (α <8 ° ∧β <8 °), The ball constant velocity rotation joint according to claim 3.   The inner surface (23) of the joint outer portion (12), the outer surface (24) of the joint inner portion (14), and the outer surface (25) and inner surface (26) of the ball cage (21) are ball segmentation surfaces, respectively. The radial play COR between the part (12) and the ball cage (21) and the radial play CIR between the ball cage (21) and the joint inner part (14) are 0.015 to 0.20 mm, respectively. The ball constant velocity rotation joint according to claim 1, wherein the ball constant velocity rotation joint is provided.   The radial play BO of the ball (20) in the track pair (16, 17; 18, 19) is -0.03 mm (press fit) to 0.08 mm (play fit). The ball constant velocity rotary joint according to any one of the above.   The axial play BC of the ball (20) in the cage window (22) is from -0.03 mm (press fit) to 0.1 mm (play fit). Ball constant velocity rotary joint.   The track center line M16 of the first outer ball track (16) has an arc having a radius R2 at the center, and the center point O2 of the arc is the center plane E of the joint in the first direction. And the track center line M16 of the first outer ball track (16) following the arc is gradually radiused from the radius R2 in the first direction. The track center line M17 of the first inner ball track (17) has an arc having a radius R2 ′ at the center, and the center point O2 ′ of the arc is , Being displaced from the center plane E of the joint by a predetermined axial offset in the second direction, and following the arc, the track center line M17 of the first inner ball track (17) is Second direction The ball constant velocity rotary joint according to any one of claims 1 to 7, wherein the ball is gradually biased radially inward from the radius R2 '.   The track centerline M16 of the first outer ball track (16) has an arc with a smaller radius R3, following the arc with radius R2, in the first direction, and having the same curvature direction; The arc smoothly follows the arc having radius R2, and the track center line M17 of the first inner ball track (17) follows the arc having radius R2 'in the second direction and has the same curvature. 9. The ball constant velocity rotary joint according to claim 8, comprising an arc having a smaller radius R3 'having a direction, the arc smoothly following the arc having a radius R2'.   A track center line M16 of the first outer ball track (16) follows an arc having a radius R2 in a second direction, and gradually deviates radially outward from the radius R2. The track center line M17 of the inner ball track (17) follows a circular arc having a radius R2 'in a first direction and is gradually offset radially outward from the radius R2'. The ball constant velocity rotary joint according to 8 or 9.   The track centerline M16 of the first outer ball track (16) has an arc having a radius R1 having a reverse direction of curvature followed by an arc having a radius R2 in a second direction; The circular arc smoothly follows the circular arc having the radius R2, the center point O1 of which is located outside the circle drawn by the radius R2 centered on the central point O2, and the first inner ball track The track center line M17 of (17) has an arc having a radius R1 'having a curved direction opposite to the arc having a radius R2' following the arc having the radius R2 'in the first direction. The constant velocity of the ball according to claim 10, smoothly following an arc having ′, the center point O1 ′ of which is located outside the circle drawn by the radius R2 ′ centered on the center point O2 ′. Rotary joint.   The track center line M18 of the second outer ball track (18) has an arc having a radius R5 at the center, and the center point O5 of the arc is the center plane E of the joint in the second direction. The track center line M18 of the second outer ball track (18) following the arc is gradually shifted from the radius R5 in the second direction. The track center line M19 of the second inner ball track (19) has a circular arc having a radius R5 'at the center, and is biased outward in the radial direction, and the center point O5' of the circular arc. Is shifted from the central plane E of the joint by a predetermined axial offset in the first direction, and further, the track center line M19 of the second inner ball track (19) following the arc. But The ball constant-velocity joint according to any one of claims 8 to 11, which is gradually deviated radially outward from the radius R5 'in the first direction.   The track centerline M18 of the second outer ball track (18) has an arc having a radius R4 with a reverse curvature direction, followed by an arc having a radius R5 in a second direction; A circular arc smoothly follows an arc having a radius R5, the center point O4 of which is located outside the circle drawn by the radius R5 centered on the center point O5, and the second inner ball track The track center line M19 of (19) has an arc having a radius R4 'having a curved direction opposite to the arc having a radius R5' following the arc having the radius R5 'in the first direction. The constant velocity of the ball according to claim 12, wherein the center point O4 ′ is smoothly outside the circle drawn by the radius R5 ′ centered on the center point O5 ′. Rotary joint.   Three first track pairs (16, 17) and three second track pairs (18, 19) are provided, and these first track pair and second track pair are all included. The ball constant velocity rotary joint according to any one of claims 1 to 13, wherein the ball constant velocity rotary joint is alternately arranged over a circumference.   Four first track pairs (16, 17) and four second track pairs (18, 19) are provided, and these first track pairs and second track pairs are all included. The ball constant velocity rotary joint according to any one of claims 1 to 13, wherein the ball constant velocity rotary joint is alternately arranged over a circumference.   The inner spherical surface (23) at the joint outer part (12) is exclusively soft-turned and hardened, and the ball tracks (16, 18) are hardened and ground. The ball constant velocity rotary joint according to any one of the above.

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