JPH11218147A - Constant velocity joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the rigidity of a retainer for holding balls and ensure sufficient durability in structure provided with eight balls. SOLUTION: Balls 4, 4 are held in a circumferentially displaceable state in pockets 10, 10 provided at a retainer 9a. The circumferential length and pitch of the respective pockets 10, 10 are devised, and the circumferential length of column parts 30, 30 between the adjacent pockets 10, 10 is ensured to make the balls 4, 4 rotatable in the state of imparting a joint angle and to allow the balls 4, 4 to be integrated in the respective pockets 10, 10. The rigidity of the retainer 9a can be ensured by the portion of ensuring the length of the column parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A constant velocity joint according to the present invention is integrated with, for example, a rolling bearing unit for supporting a driving wheel on an independent suspension type suspension, and is used for transmitting a driving force from a transmission to the driving wheel. Use.

[0002]

2. Description of the Related Art A constant velocity joint is provided between a transmission of an automobile and a driving wheel supported by an independent suspension to control a relative displacement between a differential gear and the driving wheel and a steering angle given to the wheel. Instead, the driving force of the engine can be transmitted to the driving wheels at the same angular velocity over the entire circumference. Conventionally, as a constant velocity joint used for such a portion, for example, Japanese Utility Model Laid-Open No.
No. 5, No. 59-185425, No. 62-12
No. 021 is known.

[0003] Such a conventionally known constant velocity joint 1 transmits rotational force between an inner ring 2 and an outer ring 3 through six balls 4, 4 as shown in FIGS. It is configured to do so. The inner ring 2 is fixed to the outer end of one shaft 5 driven to rotate by the transmission.
The outer wheel 3 is fixed to the inner end of the other shaft 6 for fixing the driving wheel. Six inner engagement grooves 7 having an arc-shaped cross section are formed on the outer peripheral surface 2a of the inner ring 2 at equal intervals in the circumferential direction, and are respectively formed at right angles to the circumferential direction. On the inner peripheral surface 3a of the outer race 3, six outer engaging grooves 8, 8 also having an arc-shaped cross section are provided at positions opposed to the inner engaging grooves 7, 7 in the circumferential direction. They are formed at right angles.

[0004] A retainer 9 having an arc-shaped cross section and being entirely annular is held between the outer peripheral surface 2a of the inner race 2 and the inner peripheral surface 3a of the outer race 3. At six positions in the circumferential direction of the retainer 9, pockets 10, 10 are formed at positions corresponding to the inner and outer engagement grooves 7, 8, and one pocket 10 is formed inside each pocket 10, 10. Each of them holds a total of six balls 4,4. These balls 4, 4
While being held in the pockets 10, 10, they can roll freely along the inner and outer engagement grooves 7, 8.

As shown in FIG. 10, each of the pockets 10, 10 has a rectangular shape which is long in the circumferential direction. With the change of the axis intersection angle α, which will be described later, the balls 4, 4 adjacent to each other in the circumferential direction are formed. Even if the interval changes, the change can be absorbed. That is, the bottom surfaces 7a, 7a of the inner engagement grooves 7, 7
The positional relationship among them and the positional relationship between the bottom surfaces 8a and 8a of the outer engagement grooves 8 and 8 have a relationship like a meridian of a globe as shown by a dashed line in FIG. When the center axis of the inner ring 2 is coincident with the center axis of the outer ring 3 (axis intersection angle α = 180 °), each of the balls 4, 4 is positioned at the equator of the globe shown by the two-dot chain line in FIG. 11. Present near the corresponding position. On the other hand, the center axis of the inner ring 2 does not match the center axis of the outer ring 3 (axis intersection angle α <180 °).
And each of the balls 4 with the rotation of the constant velocity joint 1,
4 reciprocates vertically (alternately in the north and south pole directions of the globe) in FIG. As a result, the distance between the balls 4, 4 adjacent in the circumferential direction is enlarged or reduced, so that each of the pockets 10, 10 is formed as a rectangle long in the circumferential direction so that the distance can be expanded or reduced.
The bottom surfaces 7a, 7a of the inner engaging grooves 7, 7 and the bottom surfaces 8a, 8a of the outer engaging grooves 8, 8 are not concentric with each other, as is clear from the above description. Therefore, the lines corresponding to the meridians are slightly offset from each other in each of the engagement grooves 7 and 8.

Further, as shown in FIG. 8, regardless of the displacement between the one shaft 5 and the other shaft 6, each of the balls 4
At the intersection o between the center line a of the one shaft 5 and the center line b of the other shaft 6, the two lines a,
It is arranged in a bisecting plane c that bisects the angle α formed by b. Therefore, the bottom surfaces 7a, 7 of the inner engagement grooves 7, 7 are provided.
a is located on the center line a on a spherical surface centered on a point d separated by h from the intersection o, and the bottom surfaces 8a, 8a of the outer engagement grooves 8, 8 are located on the center line b. , And is located on a spherical surface centered on a point e which is separated from the intersection o by h. However, the outer peripheral surface 2a of the inner ring 2, the inner peripheral surface 3a of the outer ring 3, and the inner and outer peripheral surfaces of the retainer 9 are respectively located on a spherical surface centered at the intersection point o, and the outer periphery of the inner ring 2 Sliding between the surface 2a and the inner peripheral surface of the cage 9 and sliding between the inner peripheral surface 3a of the outer ring 3 and the outer peripheral surface of the cage 9 are allowed.

In the case of the constant velocity joint 1 constructed as described above, when the inner ring 2 is rotated by the one shaft 5, this rotational motion is transmitted to the outer ring 3 via the six balls 4, 4. Shaft 6 rotates. When the positional relationship between the two shafts 5 and 6 (the axis intersection angle α) changes, the balls 4 and 4 roll along the inner and outer engagement grooves 7 and 8, and the one shaft 5 and the other shaft 6 are allowed to displace.

Although the basic structure and operation of the constant velocity joint are as described above, such a constant velocity joint and a rolling bearing unit for a wheel for rotatably supporting the wheel with respect to a suspension device are provided. Integral combination has been studied in recent years. That is, in order to rotatably support the wheels of the automobile on the suspension device, a rolling bearing unit for a wheel in which an outer ring and an inner ring are rotatably combined via a rolling element is used. If such a rolling bearing unit for a wheel and the above-described constant velocity joint are integrally combined, the rolling bearing unit for a wheel and the constant velocity joint can be configured to be small and lightweight as a whole. As a so-called fourth-generation hub unit, a so-called fourth-generation wheel rolling bearing unit integrally combining such a rolling bearing unit for a wheel and a constant velocity joint is disclosed in Japanese Patent Application Laid-Open No. Hei 7-31775.
No. 4 is known.

FIG. 12 shows a conventional structure described in this publication. In an assembled state to a vehicle, the outer ring 11 which does not rotate while being supported by the suspension device has a first mounting flange 12 for supporting the suspension device on the outer peripheral surface, and a double-row outer ring raceway 13 on the inner peripheral surface. 13 respectively. Inside the outer ring 11, first and second inner ring members 14, 15 are provided.
Are arranged. The first inner ring member 14 has a second mounting flange 17 for supporting the wheel at one end (leftward in FIG. 12) of the outer peripheral surface, and a second mounting flange 17 at the other end (rightward in FIG. 12). The first inner raceway 18 is formed in a cylindrical shape provided for each. On the other hand, the second inner ring member 15 has one end (the left end in FIG. 12) as a cylindrical portion 19 for externally fitting and fixing the first inner ring member 14, and the other end (FIG. 12). (The right end) is the outer race 3A of the constant velocity joint 1a, and the second inner raceway 20 is provided on the outer peripheral surface of the intermediate part. Then, each of the outer raceways 13, 13 and the first and second inner raceways 18,
By providing a plurality of rolling elements 21, 21 respectively with the hub 16, the hub 16 is provided inside the outer race 11.
Is rotatably supported.

[0010] Locking grooves 22 and 23 are formed at positions where the inner peripheral surface of the first inner ring member 14 and the outer peripheral surface of the second inner ring member 15 are aligned with each other, and a retaining ring is provided. The first inner race member 14 is prevented from falling out of the second inner race member 15 by providing the first inner race member 14 in such a manner as to bridge the two engagement grooves 22 and 23. Further, the outer peripheral edge of one end face (left end face in FIG. 12) of the second inner race member 15 and the stepped portion 2 formed on the inner peripheral face of the first inner race member 14 are described.
The first and second inner ring members 14 and 15 are connected and fixed to each other by welding 26 between the inner ring members 5 and 5.

Further, between the openings at both ends of the outer race 11 and the outer peripheral surface of the intermediate portion of the hub 16, a substantially cylindrical cover 27a, 27b made of a metal such as a stainless steel plate is provided. Ring seal 28 made of material
a and 28b. These covers 27a, 27
b and the seal rings 28a and 28b block the portion where the plurality of rolling elements 21 and 21 are installed from the outside, prevent the grease present in this portion from leaking outside, and provide rainwater, Prevents foreign matter such as dust from entering. Further, a partition plate portion 29 for closing the inside of the second inner ring member 15 is provided inside the intermediate portion of the second inner ring member 15 so as to secure the rigidity of the second inner ring member 15. Foreign matter that has entered the inside of the second inner ring member 15 through the opening (the left end in FIG. 12) of the second inner ring member 15 is prevented from reaching the constant velocity joint 1a. The constant velocity joint 1a is the same as that shown in FIG.
It has the same configuration as the constant velocity joint 1 shown in FIGS. FIG. 12 shows an example of a fourth generation hub unit, and various other fourth generation hub units have been conventionally considered.

When assembling the rolling bearing unit for a wheel configured as described above to a vehicle, the first mounting flange 1
2 supports the outer ring 11 on the suspension device, and the second mounting flange 17 allows the driving wheel to be connected to the first inner ring member 14.
Fixed to. Also, the tip of a drive shaft (not shown), which is rotationally driven by the engine via a transmission,
The spline is engaged with the inside of the inner ring 2 constituting the constant velocity joint 1a. When the automobile is running, the rotation of the inner ring 2 is transmitted to the hub 16 including the second inner ring member 15 via the plurality of balls 4, 4, and the wheels are rotationally driven.

In order to further reduce the size of the fourth-generation rolling bearing unit for wheels as described above, the constant velocity joint 1 must be used.
It is effective to reduce the diameter of the circumscribed circle of the plurality of balls 4 that constitute a. Then, in order to reduce the diameter of the circumscribed circle, the diameter of each of the balls 4, 4 is reduced,
Moreover, in order to secure the torque that can be transmitted by the constant velocity joint 1a, it is necessary to increase the number of the balls 4, 4. Even if the number of balls 4 is increased due to such circumstances, in order to ensure the durability of the cage 9 holding these balls 4, a plurality of balls provided on the cage 9 are required. Column part 3 existing between pockets 10, 10
It is necessary to secure a length dimension in the circumferential direction of 0, 30 (see FIGS. 9, 10, 14 to 16). If the lengths of the pillars 30 and 30 in the circumferential direction are insufficient, the rigidity of the retainer 9 is insufficient, and the pockets are not used with long-term use. This is because there is a possibility that damages such as cracks may occur from the peripheral portions of 10, 10. However, increasing the length of each of the pillars 30, 30 is restricted in terms of preventing interference with the balls 4, 4.
That is, first, the length of each of the pockets 10 and 10 in the circumferential direction is determined by setting the constant velocity joint 1a to the joint angle (the positional relationship between the center axis of the inner ring 2 and the center axis of the outer ring 3A is changed from a linear state). Each ball 4, 4 is displaced in the circumferential direction of the retainer 9 when rotated in a state where the angle is shifted. The complement angle of the axis intersection angle α shown in FIG. There is a need. Secondly, after assembling the constant velocity joint 1a, the inner ring 2, the outer ring 3A, and the retainer 9 are combined, and the above-mentioned lengths are stored in the pockets 10, 10 of the retainers 9, 9. It must be large enough to accommodate the balls 4,4.

Considering such points, the ball 4,
Japanese Patent Application Laid-Open No. HEI 9-177781 discloses a structure in which the number of 4 is larger than 6 and the length of each of the column portions 30 is increased.
No. 4 discloses a constant velocity joint 1b as shown in FIGS. The constant velocity joint 1b described in this publication transmits the rotational force between the inner ring 2 and the outer ring 3 by eight.
It is configured so as to be performed via the balls 4, 4. In the case of the structure described in this publication,
The pockets 10a and 10a having a large length in the circumferential direction and the pockets 1 having a short length are provided at eight circumferential positions of a.
0b and 10b are arranged at regular intervals (with the same division pitch angle) and alternately. Of these two types of pockets 10a and 10b, the pockets 10b and 10b having shorter lengths are arranged at both ends in the longitudinal direction of each of the pockets 10b and 10b even when the constant velocity joint 1b is used at the maximum joint angle. The inner side surface and the rolling surfaces of the balls 4, 4 held in these pockets 10b, 10b are sized so as not to interfere with each other. On the other hand, the pockets 10a and 10a having long lengths are arranged so that the central axis of the inner ring 2 and the central axis of the outer ring 3 are aligned with each other to accommodate the balls 4 and 4 in the pockets 10a and 10a. Even when the pockets 10a and 10a are tilted beyond the maximum value of the joint angle in the above use state,
The inner surfaces of both ends in the longitudinal direction and these pockets 10a, 1a
The size is set so as not to interfere with the balls 4 and 4 to be incorporated in Oa.

[0015] The above-mentioned Japanese Patent Application Laid-Open No. Hei 9-1
According to the constant velocity joint described in Japanese Patent No. 77814, after the balls 4 and 4 are assembled into the long pockets 10a and 10a, the short pocket 10 is used.
By incorporating the balls in b, 10b, the balls 4, 4 can be incorporated in all the pockets 10a, 10b. That is, the balls 4, 4 are placed in these pockets 10a, 10b.
As shown in FIG. 16, the center axis of the inner ring 2 and the center axis of the outer ring 3 are tilted beyond the maximum value of the joint angle in the use state. When the balls 4, 4 are incorporated into the pockets 10a, 10a having a long length, the ends of the pockets 10a, 10a and the inner engaging grooves 7, 7 formed on the outer peripheral surface of the inner ring 2 are formed.
Is aligned with at least one of the balls 4, 4.
Therefore, the balls 4, 4 can be reliably incorporated into each of the pockets 10a, 10a. Next, when the center axis of the inner ring 2 and the center axis of the outer ring 3 are inclined as shown in FIG. 16 in order to incorporate the ball into the four pockets 10b and 10b having short lengths, the length is already increased. As shown by broken lines in FIG. 15, the balls 4, 4 incorporated in the long pockets 10a, 10a are displaced in the pockets 10a, 10a in a direction approaching the short pockets 10b, 10b. I do. The central portion of each of the pockets 10b, 10b having the short length dimension and the inner ring 2
Are aligned with the ends of the inner engaging grooves 7, 7 formed on the outer peripheral surface of. Therefore, the balls 4, 4 can be reliably incorporated into each of the pockets 10b, 10b.

As described above, each of the pockets 10a, 10b
The state where the balls 4 and 4 are incorporated therein will be described with reference to FIG. FIG. 17 shows pockets 10a and 10b of a retainer to be incorporated in a constant velocity joint described in the above publication.
Are schematically shown as well as their lengths. 4
The pockets 10a and 10b each provided with a total of eight
They are arranged at equal intervals at intervals of 45 degrees in the circumferential direction. The arc-shaped portions indicated by diagonal lattices and denoted by reference numerals represent the positions and lengths of the pockets 10a and 10b. That is, the central position in the circumferential direction of each of the arc portions corresponds to the central position in the longitudinal direction of each of the pockets 10a and 10b. In addition, the length of each arc-shaped portion is
It represents the amount of displacement in the circumferential direction of the balls 4 and 4 (FIGS. 13 to 16) in each of the pockets 10a and 10b, which changes according to the length of each of the pockets 10a and 10b. That is, the pockets 10a and 10a having a long length
Ball 4,4 incorporated within the both sides in the circumferential direction around the circumferential center position, is freely displaceable by gamma _0, respectively. On the other hand, the pocket 10b having a short length dimension,
Ball incorporated within 10b 4, 4 are both sides in the circumferential direction around the circumferential center position, it is freely displaceable by gamma _1, respectively. The angles γ _x (x = 0, 1, B −−−) described in FIG. 17 and FIGS. 2 to 7 described below are exaggerated for clarity. The operation of incorporating the balls 4 and 4 into the arcuate portions denoted by the above-mentioned symbols and drawn on different portions arranged on concentric circles is performed sequentially from the inside in the diameter direction to the outside. The incorporation of the balls 4, 4 into the arc-shaped portions drawn on the same arc is not performed at the same time,
It does not matter before or after the installation procedure.

When assembling the balls 4, 4 into the retainer 9a described in the above-mentioned publication, which can be expressed as described above, first, a pocket 10a having a long length, which is denoted by a reference numeral,
The balls 4 and 4 are assembled one by one into 10a. Next, balls are sequentially incorporated one by one into the four pockets 10b, 10b, each of which has a short length, and are denoted by reference numerals. When the central axis of the inner ring 2 and the central axis of the outer ring 3 are inclined as shown in FIG. 16 for this assembling operation, the balls 4, which have already been incorporated into the long pockets 10a and 10a, 4 is indicated by an arrow in FIG.
The pockets 10a and 10b are displaced in the direction approaching the short pockets 10b and 10b. However, since the length of each of the pockets 10a and 10a is large, each of the pockets 10b and 10b having the short length is
Before the ends of the inner engagement grooves 7, 7 formed on the outer peripheral surface of the inner ring 2 are aligned with one or more of the balls 4, the lengthwise inner surfaces of the pockets 10a, 10a are There is no interference with the rolling surfaces of the balls 4, 4 already incorporated in the pockets 10a, 10a. Therefore, the center axis of the inner ring 2 and the center axis of the outer ring 3 can be greatly inclined, and the pockets 10b, 10b having the short lengths can be inclined.
The balls 4, 4 can be incorporated into the inside.

[0018]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 9-1 is disclosed.
In the case of the constant velocity joint described in Japanese Patent No. 77814, two types of pockets 10a and 10b having different lengths in the circumferential direction are alternately arranged at equal intervals in the circumferential direction. I have. Therefore, as compared with the case where a single kind of pocket is used, the length dimension of the pillar portion existing between the circumferentially adjacent pockets in the circumferential direction can be increased, but can still be sufficiently increased. It can not be said. In view of such circumstances, the present invention has been made in order to increase the length of the column portion and improve the rigidity of the retainer, and to realize a constant velocity joint having a small size and excellent durability. It is.

[0019]

The constant velocity joint according to the present invention has an inner race and an inner ring similar to the above-mentioned conventional constant velocity joint.
An inner engaging groove having an arc-shaped cross section formed at a right angle to the circumferential direction at eight or more even-numbered positions located at equal circumferential positions on the outer peripheral surface of the inner ring; An outer ring provided on the outer ring; an outer engaging groove having an arc-shaped cross section formed in a direction perpendicular to the circumferential direction at a position facing the inner engaging grooves on an inner peripheral surface of the outer ring; A retainer formed between the outer peripheral surface and the inner peripheral surface of the outer ring and having a plurality of circumferentially long pockets formed at positions matching the inner and outer engagement grooves, respectively; It is composed of an even number of eight or more balls that can freely roll along both the inner and outer engagement grooves while being held, and each of these balls is connected to the center axis of the inner ring and the center of the outer ring. It is arranged in the bisecting plane of the axis intersection angle with the axis. In particular, in the constant velocity joint of the present invention, at least two types of pockets having different circumferential lengths are provided as the plurality of pockets. By arranging these pockets at unequal intervals in the circumferential direction, it is possible to secure the length in the circumferential direction of the column portion existing between the pockets adjacent in the circumferential direction, while maintaining the length in the circumferential direction. Each of the balls can be incorporated into a pocket.

[0020]

According to the constant velocity joint of the present invention constructed as described above, the length of the pocket for holding the ball in the circumferential direction can be minimized. And
By reducing the length of the pocket, the length of the pillar portion is increased to improve the rigidity of the cage, and a constant velocity joint having a small size and excellent durability can be realized.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
0 corresponding to any one of the embodiments of the present invention and Japanese Patent Application Laid-Open No.
It is the table | surface and schematic diagram which compared with the conventional structure described in 177814 gazette. In order to explain each embodiment of the present invention in comparison with a conventional structure, first, the viewpoint of FIG. 1 will be described. The “pocket length (displacement angle)” described in the upper part of FIG. 1 means that the ball held in the pocket changes in accordance with the length of the pocket formed in the cage and is displaced in the circumferential direction. The possible length is represented by the central angular pitch for the cage. In addition, [large pocket]
The columns of [middle pocket], [small pocket], and [type] indicate the type of the pocket and the number of each. The column of the column length γ _T determines the outer circumferential surface length of the column existing between the pockets adjacent in the circumferential direction,
The displacement angle γ _T of a pair of balls allowed in a pair of pockets sandwiching the column is shown. In the column of [Pocket division pitch], the amount of displacement (correction angle) with respect to the case where the center position in the circumferential direction of each pocket is assumed to be arranged at equal intervals in the circumferential direction.
Is represented by the center angle pitch of the cage. In the column of [small pocket arrangement], the approximate circumferential position of the pocket having the smallest circumferential length is represented by the center angle pitch of the cage. The column of [Rotation of cage at the time of assembling] is already installed in another pocket when the center axis of the inner ring and the center axis of the outer ring are largely displaced in order to install the ball in any pocket. The ball that has pressed the inner surface of the end of the pocket in the circumferential direction indicates whether or not to rotate the retainer, "Absent" indicates that the cage is not rotated, and "Yes" indicates that the cage is rotated. I have. In addition, the column of [Ball assembly order regulation] indicates whether or not there is regulation on the procedure for assembling the ball in each pocket. Further, the schematic diagram at the bottom shows the arrangement of the pockets and pillars as described above. In each of these schematic diagrams, each straight line drawn in the diametric direction of a circle representing the shape of the retainer represents the center position of each pocket, and the symbols shown near these straight lines on the outer periphery of the circle are: , The type of the pocket described in the above table. Furthermore, the octant arc-shaped portion existing between the straight lines adjacent in the circumferential direction represents a column portion existing between the pockets adjacent in the circumferential direction, and ± Symbols indicate the type of circumferential length of the column and the direction in which the division pitch of the adjacent pocket is corrected.

Next, before describing the embodiments of the present invention, portions common to the respective embodiments will be described. The number of pockets provided in both the inner and outer engagement grooves and the retainer constituting the constant velocity joint of the present invention is n
The groove division pitch angle δ of both the inner and outer engagement grooves is (36
0 ° / n). In the illustrated embodiment, since the number of pockets is eight in each case, the groove division pitch angle δ is 45 °.
It is. However, for the sake of simplicity, in the following description, this groove division pitch angle of 45 ° will be described as δ. In considering the angles described in the table of FIG. 1, the center axis of the retainer with respect to the center axis of the inner ring and the center axis of the outer ring on a plane including the center axis of the inner ring and the center axis of the outer ring. (1/2 of the supplementary angle of the axis intersection angle α described above) θ is considered. Also, a straight line portion where a plane including the center axis of the inner ring and the center axis of the outer ring intersects the bisecting plane is set as a reference line, and exists on this bisecting plane. The angle formed between the groove division pitch line passing through the center position of the mating groove in the circumferential direction and the reference line at the intersection is β. After assembling the retainer between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, when incorporating the ball into any one of the plurality of pockets provided in the retainer, the circumference of the pocket is Assuming that the ball is held in a pocket adjacent in the direction, the maximum value γ ₀ of the displacement angle of the ball in the circumferential direction is determined by the center axis of the inner ring and the center axis of the outer ring in this assembly. Γ ₀ = δ−tan ⁻¹ (tanδ · c) where θ ₀ is the maximum value of the inclination angle of the center axis of the cage with respect to
osθ ₀ ). After the assembly is completed, the maximum value γ ₁ of the circumferential displacement angle of the ball held in the pocket during use during use is determined by the cage relative to the center axis of the inner ring and the center axis of the outer ring during use. the maximum value of the inclination angle of the central axis and theta ₁ of, beta is a angle in a range of 45 to 50 °, a ^{_{γ 1 ≒ β-tan -1 (}} tanβ · cosθ 1).
When the outside diameter of the ball is D _a and the outside diameter of the cage is D _c , the point where the rolling surface of the ball contacts the inner surface of the circumferential end of the pocket and the cage The ball half angle γ, which is the intersection angle between a first straight line connecting the center axis of the ball and a second straight line connecting the center axis and the center point of the ball.
_B becomes γ _B = sin ⁻¹ (D _a / D _c ). Further, within the range of the groove division pitch angle δ, the sum of the displacement angles of a pair of balls allowed in a pair of pockets sandwiching the column portion is defined as γ _T, and the processing error of each pocket is reduced. The small angle corresponding to the sum of the margin and the angle with respect to the center axis of the cage is △ γ, and the ball held in the pocket is
When the length of the space in the circumferential direction occupied with its own outer diameter and some allowance is defined as A corresponding to the angle with respect to the center axis of the retainer, A = 2γ _B + △ γ
Becomes The column angle γ _P in which the circumferential length of the column on the outer diameter surface of the cage corresponds to the angle with respect to the center axis of the cage is γ _P = δ−γ _T −A. Become. After assembling the retainer between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, when incorporating the ball into any one of the plurality of pockets provided in the retainer, the circumference of the pocket is Assuming that the ball is held in a pocket adjacent in the direction, the maximum value γ ₀ of the displacement angle of the ball in the circumferential direction is determined by the center axis of the inner ring and the center axis of the outer ring in this assembly. the maximum value of the inclination angle theta of the center axis of the retainer as theta _{0 ^{for, γ 0 = δ-tan -1}} (tanδ ·
cos θ ₀ ). After the assembly is completed, the maximum value γ ₁ of the displacement angle of the ball held in the pocket in the circumferential direction during use during use is determined by the retainer relative to the center axis of the inner ring and the center axis of the outer ring during use. the central axis the maximum value of the inclination angle and theta ₁ of the angle in a range beta is 45 to 50 °, the ^{_{γ 1 ≒ β-tan -1 (}} tanβ · cosθ 1).

As shown in FIG. 3, the rolling surface of the ball and the peripheral edge of each pocket abut on the outer peripheral edge of the cage. The reason for this is that, due to the circumstances when each pocket is formed by press working, the length of each pocket in the circumferential direction of the cage is substantially equal from the inner diameter side to the outer diameter side of the cage, and This is because the radial side edge protrudes most toward the rolling surface. Therefore,
The outside diameter of the ball is D _a, and the outside diameter of the cage is D _c
In this case, a first straight line connecting a point at which the rolling surface of the ball contacts the inner surface at the circumferential end of the pocket and the central axis of the cage, and the central axis and the central point of the ball Half angle γ _B of the ball, which is the angle of intersection with the second straight line connecting
Is γ _B = sin ⁻¹ (D _a / D _c ). Further, a small angle corresponding to the sum of the machining error and the allowance for each pocket corresponding to the angle with respect to the center axis of the retainer is defined as △ γ, and the ball held in the pocket has its own outer diameter and some When the space occupied in the circumferential direction occupied with the allowance is A, the angle corresponding to the angle with respect to the center axis of the cage is A = 2γ _B + △ γ. Then, within the range of the groove division pitch angle δ, the sum of the displacement angles of a pair of balls allowed in a pair of pockets sandwiching the pillar portion is γ _T
In this case, the column angle γ _P in which the circumferential length of the column portion on the outer diameter surface of the cage corresponds to the angle with respect to the center axis of the cage is γ _P = δ−γ _T -A. The column length L _P of the circumferential length expressed in chord length of at the column portion on the outer diameter surface of the cage, L _P = D _c · sin
(Γ _P / 2) = D _c · sin {(δ−γ _T −A) / 2}. Thus, the column angle γ _P in which the circumferential length of the outer peripheral surface of the column portion corresponds to the angle with respect to the central axis of the cage, and the column in which the circumferential length of the column portion is represented by the chord length. Length _LP
Is determined by the above-described four elements of D _c , δ, γ _T , and A. However, when the space A occupied by the balls held in each pocket, the outer diameter D _{c of} the retainer, and the groove division pitch angle δ determined by the number of balls are constant, the above-mentioned columnar parts γ _P and column length L _P is determined by the size of the gamma _T.

On the premise of the above, first, FIGS.
A first example of the embodiment of the present invention corresponding to claims 2 and 3 will be described. The feature of the present invention is to increase the length of the pillar portion by the necessary minimum length in the circumferential direction of the pocket for holding the ball. In length and the distance in the circumferential direction. Other configurations and operations are the same as those of the conventionally known constant velocity joint 1b, for example, as shown in FIGS. 13 to 16 described above. Hereinafter, a description will be given mainly of the characteristic portions of the present invention. FIG. 2 schematically shows the arrangement of the pockets of the retainer and their respective circumferential lengths, similarly to FIG. 17 described above. The meaning of each part in FIG. 2 is the same as that in FIG. In addition, the solid line arrow described in FIG. 2 indicates that when the center axis of the inner ring and the center axis of the outer ring are largely displaced in order to incorporate the ball in any pocket, the ball already incorporated in another pocket is The direction in which the ball is displaced with respect to the circumference of the retainer (in the process of assembling the balls sequentially described from the inner diameter side to the outer diameter side on the concentric circle and in the pocket existing on the same arc as the arrow) is shown. In addition, when the center axis of the inner ring and the center axis of the outer ring are greatly displaced in order to incorporate the ball in any one of the pockets, the dashed arrow indicates that the ball already incorporated in the other pocket is in the circumferential direction of the pocket. The direction in which the inner surface of the end is pushed to rotate the retainer is shown. The length of each arrow represents the amount of displacement. However, in FIG. 2 and the schematic diagrams shown below, the space occupied by the ball with respect to the circumferential length of each pocket (A described above)
Is represented by the length that allows the ball to be displaced, as in the case of FIG. 17 described above.

In the case of the present example, four first columnar portions each having a column angle γ _P obtained by setting γ _T to γ ₀ and a column angle γ obtained by setting γ _T to (γ ₀ + γ ₁ ). _And four second pillars having _P. The arrangement of the first and second pillar portions is such that the first and second pillar portions are formed as a pair, and the pair of the first pillar portions and the pair of the second pillar portions are arranged in the circumferential direction. Are arranged alternately. A first pocket (FIG. 2) that holds the ball so as to be displaceable in the circumferential direction by (2γ ₀ −γ ₁ ) and a second pocket (see FIG. 2) that also holds the ball so as to be displaceable by 2γ ₁ . ) Are alternately arranged in the circumferential direction. For this reason, the dividing pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of the first and second pockets adjacent to each other in the circumferential direction and the center axis of the retainer, is defined as , (Δ ± γ ₁ /
2) And this division pitch angle is (δ + γ
_1/2) is place with a 2 point pair ([delta]-gamma
_1/2) is the location of the two positions one set, ([delta] + gamma ₁ /
2) Location of the set and is a location of the set is a _{(δ-γ 1/2)} , are arranged alternately in the circumferential direction.

According to the constant velocity joint of the present invention, which incorporates the retainer constructed as described above, the circumferential length of the pocket for holding the ball can be minimized. it can. Then, the rigidity of the retainer is improved by increasing the length of the pillar portion by the amount corresponding to the decrease in the length of the pocket, and a constant velocity joint having a small size and excellent durability can be realized. That is, in order to incorporate the balls 4, 4 into each pocket provided in the retainer, first,
Of the second pockets, which are small pockets, located at four positions in the circumferential direction, in the second pocket of FIG.
As shown in FIG. 16 described above, the balls 4, 4 are sequentially incorporated one by one.

Next, there are four positions in the circumferential direction.
Among the first pockets as the middle pockets, the balls 4, 4 are sequentially incorporated one by one into the first pocket of the portion shown in FIG. 2 as shown in FIG. On this occasion,
Increase the center axis of the inner ring 2 and the center axis of the outer ring 3 (θ ₀ minutes)
With the displacement in the bending direction, the balls 4, 4 already incorporated in the second pocket of the above-mentioned portion are displaced in the circumferential direction in a direction approaching the first pocket of the above-mentioned portion. In the course of this displacement, the rolling surfaces of these balls 4, 4 come into contact with the inner surfaces of the circumferential ends of the second pockets of the above-mentioned portions. After these two surfaces come into contact with each other, when the center axis of the inner ring 2 and the center axis of the outer ring 3 are further bent, each of the balls 4, 4 pushes the retainer in the circumferential direction, and the retainer is moved to the position shown in FIG. Rotate in the circumferential direction by (γ ₀ −γ ₁ ) as indicated by the dashed arrow corresponding to the first pocket of the portion (shown on an arc with a diagonal grid drawn on the portion) (△ for simplicity) γ component is omitted).
Since the first pocket of the above portion has a large length dimension in the circumferential direction, even when the retainer is rotated in the circumferential direction in this manner, each of these first pockets and both the inner and outer engagement grooves 7, 8 are provided. (FIGS. 13, 14, and 16) are matched by the amount by which the ball 4 can be incorporated. Therefore, the balls 4, 4 can be incorporated in the first pocket of the above portion.

Next, the remaining middle pocket, FIG.
The balls 4, 4 are sequentially incorporated one by one into the first pocket of the portion as shown in FIG.
At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are largely displaced in the bending direction, the balls 4, 4 already incorporated in the second pocket of the above-mentioned portion become the first pocket of the above-mentioned portion. , And is displaced in the circumferential direction. In the course of this displacement, each of these balls 4,
The rolling surface of No. 4 and the inner surface of the second pocket of the above-mentioned portion in the circumferential end portion are in contact with each other. After these two sides abut each other,
Further, when the center axis of the inner ring 2 and the center axis of the outer ring 3 are bent, each of the balls 4, 4 pushes the retainer in the circumferential direction, and the retainer is moved by a broken line corresponding to the first pocket in FIG. Rotate in the circumferential direction as indicated by the arrow. At this time, the balls 4, 4, which have already been incorporated in the first pocket of the above-mentioned portion, do not move far and near with respect to the first pocket of the above-mentioned portion. Accordingly, the retainer is relatively displaced in the circumferential direction with respect to the balls 4, 4 already incorporated in the above-mentioned portion. However, since the first pockets of the above-mentioned portions have a large length dimension in the circumferential direction, the balls 4, 4 incorporated in the first pockets of these portions correspond to the inner surfaces of the circumferential end portions of the respective first pockets. I will not touch you. Accordingly, the cage is rotated by (γ ₀ −γ ₁ ) in the counterclockwise direction in FIG. 2 by the balls 4, 4 incorporated in the second pocket of the above portion. Even when the retainer rotates in the circumferential direction in this manner, each of these first pockets and the inner and outer engagement grooves 7, 8 are aligned by the amount that the ball 4 can be incorporated. Therefore, the balls 4, 4 can be incorporated in the first pocket of the above portion.

Finally, the balls 4, 4 are sequentially incorporated one by one in the second pocket of the portion shown in FIG. 2, which is the remaining small pocket, as shown in FIG. At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are largely displaced in the bending direction, the balls 4, 4 already incorporated in the first pocket of the above-mentioned portion become the second pocket of the above-mentioned portion. , And is displaced in the circumferential direction. However, since the first pockets of these portions have a large length dimension in the circumferential direction, the balls 4, 4 incorporated in the first pockets of these portions correspond to the inner surfaces of the circumferential ends of these first pockets. I will not touch you. In addition, the ball already incorporated in the second pocket of the portion is hardly displaced in the circumferential direction because the two second pockets are present in the direction perpendicular to the bending direction of the central axes. Accordingly, the center axes of the inner ring 2 and the outer ring 3 are sufficiently bent so that the balls 4, 4 can be incorporated into the second pocket of the above-mentioned portion. In order to assemble the structure of the present example, when the first ball is incorporated in the first pocket of the (or) portion, the ball may be simultaneously incorporated in the second pockets adjacent in the circumferential direction.
As described above, if two balls 4 and 4 are first assembled, the position of the retainer in the circumferential direction with respect to the inner ring 2 and the outer ring 3 is regulated. There is no need to worry about positioning in the circumferential direction.

Next, a second example of the embodiment of the present invention corresponding to claims 4 and 5 shown in FIG. 4 will be described. In the case of this example, four first pillar portions each of which is obtained by setting γ _T as γ ₀ , and γ _T is (γ ₀ + γ ₁ )
And the first and second columns are formed as a pair, and the pair of the first columns and the pair of the second columns are arranged in the circumferential direction. Are arranged alternately. Such first, by providing a second double-pole portion, a first pocket displaceably held only 1.5Ganma ₀ over the ball in the circumferential direction (in FIG. 4), likewise gamma ₀ by a displacement a second pocket which can hold (in FIG. 4), are also provided and 2 [gamma ₁ only third pocket displaceably held (in FIG. 4). And it arrange | positions so that the 2nd and 3rd pocket () may exist in both sides of each said 1st pocket (), respectively.

For this purpose, the division pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of a pair of circumferentially adjacent pockets and the central axis of the retainer, is defined as: is a _{(δ ± γ 0/4)} . Then, as the division pitch angle (δ + γ _0/4) at a place with a two positions one set _{(δ-γ 0/4)} 2 positions pair place is, is (δ + γ _1/2) The set of places and (δ-γ ₀ /
4) are alternately arranged in the circumferential direction.

In the case of the present embodiment constructed as described above, first, the balls 4 are sequentially placed in the second pocket of the portion shown in FIG.
4 are incorporated one by one. Next, among the first pockets, which are medium pockets, located at four circumferential positions, the balls 4, 4 are incorporated one by one into the first pocket of the portion shown in FIG. At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are greatly displaced in the bending direction (θ ₀ ), the balls 4, 4 already incorporated in the second pocket of the above-described portion are The portion is displaced in the circumferential direction in a direction approaching the first pocket. Then, the retainer, as shown by the dashed arrows which correspond to the first pocket 4, is rotated by gamma _0/2 in the circumferential direction. Since the first pocket of the above portion has a large length dimension in the circumferential direction, even if the retainer is rotated in the circumferential direction in this way,
Since these first pockets and the inner and outer engagement grooves 7, 8 are aligned with each other, the ball 4,
4 can be incorporated. Next, similarly, the balls 4, 4 are sequentially incorporated one by one into the first pocket of the portion shown in FIG. 4, which is the remaining middle pocket.

Finally, the balls 4, 4 are sequentially incorporated one by one into the small pocket, ie, the third pocket of the portion shown in FIG. At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are largely displaced in the bending direction, the ball 4 already incorporated in the first pocket of the above-mentioned portion,
4 is displaced in the circumferential direction in a direction approaching the third pocket of the above portion. However, since the first pocket of these portions has a large length dimension in the circumferential direction, the balls 4 incorporated in the first pockets of these portions,
4 does not come into contact with the inner surface of the circumferential end of each of these first pockets. In addition, the balls already incorporated in the second pockets of the portions are hardly displaced in the circumferential direction because these two pockets are present at right angles to the bending direction of the central axes. Therefore, the center axes of the inner ring 2 and the center axis of the outer ring 3 are sufficiently bent so that the balls 4, 4 can be incorporated into the third pocket of the above-mentioned portion.

Next, a description will be given of a third embodiment of the present invention corresponding to claims 6 and 7 shown in FIG. In the case of this example, four first pillar portions each having a pillar angle γ _P obtained by setting γ _T as γ ₀ , and γ _T
Are set as (γ ₀ + γ ₁ ), the first and second columns are two pairs, and the first column and the second column are paired. And are alternately arranged in the circumferential direction. By providing such first and second pillar portions, two first pockets (FIG. 5) which hold the ball so as to be displaceable by {2 (γ ₀ −γ ₁ )} in the circumferential direction. ), Four second pockets (of FIG. 5) which are also displaceably held by (γ ₀ + γ ₁ ), and 2γ
It is provided with two third pocket that holds only _one displaceably (in FIG. 5). Then, the first and third pockets (
) Exists.

For this reason, the division pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of a pair of circumferentially adjacent pockets and the central axis of the retainer, is defined as [Δ ± {(γ ₀ −γ ₁ ) / 2}]. Then, this division pitch angle is [δ + ｛(γ ₀ −γ ₁ ) /
2｝] is a set of two places and [δ−
{(Γ ₀ −γ ₁ ) / 2}] as a set of two locations, and a set of locations [δ + {(γ ₀ −γ ₁ ) / 2}] and [δ − ｛(γ ₀ − γ ₁ ) / 2}]
They are alternately arranged in the circumferential direction.

In the case of the present embodiment constructed as described above, first, balls 4 and 4 are sequentially placed in the first pocket shown in FIG. 5 which is a middle pocket and located at two circumferential positions. Assemble one by one. Next, the balls 4, 4 are sequentially incorporated one by one into the second pockets shown in FIG. 5 among the second pockets, which are middle pockets, located at four circumferential positions. At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are greatly displaced in the bending direction (θ ₀ ), the balls 4, 4 already incorporated in the first pocket of the above-mentioned portion are The portion is displaced in the circumferential direction in a direction approaching the second pocket. And
The retainer is rotated by γ ₁ in the circumferential direction, as indicated by the dashed arrow corresponding to the second pocket in FIG. Since the second pocket of the above portion has a large length in the circumferential direction, even when the retainer is rotated in the circumferential direction in this manner, each of these second pockets and the inner and outer engagement grooves 7, 8 are provided.
And the balls 4, 4 can be incorporated in the first pocket of the above-mentioned portion. Next, similarly, the balls 4 and 4 are sequentially incorporated one by one into the second pocket of the portion shown in FIG. 5 which is the remaining middle pocket.

Finally, the balls 4, 4 are sequentially incorporated one by one into the third pocket of the portion shown in FIG. 5, which is a small pocket. At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are largely displaced in the bending direction, the ball 4 already incorporated in the second pocket of the above-mentioned portion,
4 is displaced in the circumferential direction in a direction approaching the third pocket of the above portion. However, since the second pocket of these portions has a large length dimension in the circumferential direction, the ball 4 incorporated in the second pocket of these portions,
4 does not come into contact with the inner surface of the circumferential end of each of these second pockets. In addition, the ball already incorporated in the first pocket of the portion is hardly displaced in the circumferential direction because both the first pockets are present in the direction perpendicular to the bending direction of the central axes. Therefore, the center axes of the inner ring 2 and the center axis of the outer ring 3 are sufficiently bent so that the balls 4, 4 can be incorporated into the third pocket of the above-mentioned portion.

Next, a fourth example of the embodiment of the present invention corresponding to claims 8 to 9 shown in FIG. 6 will be described. In the case of this example, two first pillar portions each having a pillar angle γ _P obtained by setting γ _T as γ ₀ and γ _T
Having a column angle γ _P determined as (γ ₀ + γ ₁ )
The plurality of second pillars are arranged so that the first pillars are adjacent to each other in the circumferential direction. Such first, by providing a second double-pillar portion, and one of the first pocket to hold only displaceably 2 [gamma ₀ over the ball 4, 4 in the circumferential direction (part of FIG. 6), One second pocket (part of FIG. 6) also held displaceably by {2 (γ ₀ −γ ₁ )} and four third pockets also held displaceable by (γ ₀ + γ ₁ ) and (part of FIG. 6), also 2 [gamma ₁ only displaceably held to two fourth pocket (part of FIG. 6)
Are provided. The first pocket () and the second pocket () exist on the opposite side in the diametrical direction, and the fourth pocket () exists substantially at the center between the first and second pockets (,) in the circumferential direction. And the third pocket () is the fourth pocket () in the circumferential direction.
And the first pocket () or the second pocket ().

For this purpose, the division pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of a pair of circumferentially adjacent pockets and the central axis of the retainer, is defined as [Δ ± {(γ ₀ −γ ₁ ) / 2}]. Then, this division pitch angle is [δ + ｛(γ ₀ −γ ₁ ) /
2｝] is a set of two places and [δ−
{(Γ ₀ −γ ₁ ) / 2}] as a set of two locations, and a set of locations [δ + {(γ ₀ −γ ₁ ) / 2}] and [δ − ｛(γ ₀ − γ ₁ ) / 2}]
They are alternately arranged in the circumferential direction.

In the case of the present embodiment constructed as described above, first, the balls 4 and 4 are sequentially incorporated one by one into the first pocket of the portion located on the diametrically opposite side and the second pocket of the portion. Then, among the third pockets, which are middle pockets, located at four circumferential positions, the balls 4, 4 are sequentially incorporated one by one into the third pocket of the portion shown in FIG. At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are largely displaced in the bending direction (θ ₀ ), the balls 4, 4 already incorporated in the first and second pockets of the above-mentioned portion are provided. Is displaced in the circumferential direction in a direction approaching the first pocket of the above portion. Then, the retainer is rotated by γ ₁ in the circumferential direction, as shown by a broken arrow corresponding to the first pocket in FIG. Since the third pocket of the above portion has a large length in the circumferential direction, even when the retainer is rotated in the circumferential direction in this manner, each of the third pockets and the inner and outer engagement grooves 7, 8 are provided. In the third pocket of the above part, the balls 4, 4
Can be incorporated. Next, similarly, the balls 4, 4 are sequentially incorporated one by one into the third pocket of the portion shown in FIG. 6, which is the remaining middle pocket.

Finally, the balls 4, 4 are sequentially incorporated one by one into the small pocket, that is, the fourth pocket in the portion shown in FIG. At this time, the ball 4, which has already been incorporated in the third pocket of the above-described portion, with the central axis of the inner ring 2 and the central axis of the outer ring 3 being largely displaced in the bending direction.
4 is displaced in the circumferential direction in a direction approaching the fourth pocket of the above portion. However, since the third pocket of these portions has a large length dimension in the circumferential direction, the ball 4 incorporated in the third pocket of these portions,
4 does not contact the inner surface of the circumferential end of each of these third pockets. In addition, the ball already incorporated in the first and second pockets of the portion is almost in the circumferential direction because these first and second pockets are present in a direction perpendicular to the bending direction of the central axes. No displacement. Therefore,
The center axis of the inner ring 2 and the center axis of the outer ring 3 are sufficiently bent so that the balls 4, 4 can be incorporated into the fourth pocket of the above-mentioned portion.

Next, a description will be given of a fifth embodiment of the present invention corresponding to claim 10 shown in FIG.
In the case of this example, eight column portions each having a column angle γ _P obtained by setting γ _T to (γ ₀ + γ ₁ ) are arranged at irregular intervals in the circumferential direction. By providing such a eight column portions at unequal intervals, and two first pockets for holding only displaceably 2 [gamma ₀ over the ball in the circumferential direction (part of FIG. 7), likewise ( Four second pockets (part of FIG. 7) which are displaceably held by γ ₀ + γ ₁ )
When, and also provided a 2 [gamma ₁ only displaceably held to two third pocket (part of FIG. 7). And 2
The first pockets () are provided at diametrically opposite positions of the retainer, and the two third pockets () are provided substantially at the center of the first pockets (). The four second pockets () are arranged between the pockets ().

For this reason, the division pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of a pair of circumferentially adjacent pockets and the central axis of the retainer, is set as follows. [Δ ± {(γ ₀ −γ ₁ ) / 2}]. Then, this division pitch angle is [δ + ｛(γ ₀ −γ ₁ ) /
2｝] is a set of two places and [δ−
{(Γ ₀ −γ ₁ ) / 2}] as a set of two locations, and a set of locations [δ + {(γ ₀ −γ ₁ ) / 2}] and [δ − ｛(γ ₀ − γ ₁ ) / 2}]
They are alternately arranged in the circumferential direction.

In the case of the present embodiment configured as described above, first, balls 4 and 4 are sequentially incorporated one by one into two first pocket portions existing on the diametrically opposite sides. Next, among the second pockets, which are medium pockets, located at four circumferential positions, the balls 4, 4 are incorporated one by one into the second pocket of the portion shown in FIG. On this occasion,
As the center axis of the inner ring 2 and the center axis of the outer ring 3 are largely displaced in the bending direction, the direction in which the balls 4, 4 already incorporated in the first pocket of the above-mentioned portion approach the second pocket of the above-mentioned portion. And displaces in the circumferential direction. However, since the length dimension of the first pocket present in the above-mentioned portion and the second pocket present in the above-mentioned portion is somewhat large, the retainer rotates in the circumferential direction regardless of the displacement in the bending direction. In addition, each of the second pockets of the above portion and the inner and outer engagement grooves 7, 8 are aligned.
For this reason, the balls 4 and 4 can be incorporated in the second pocket of the above-mentioned portion. Then, in the second pocket of the portion of FIG.
The balls 4, 4 are sequentially incorporated one by one.

Finally, the balls 4, 4 are sequentially incorporated one by one into the third pocket of the portion shown in FIG. 7, which is a small pocket. At this time, as the center axis of the inner ring 2 and the center axis of the outer ring 3 are largely displaced in the bending direction, the ball 4 already incorporated in the second pocket of the above-mentioned portion,
4 is displaced in the circumferential direction in a direction approaching the third pocket of the above portion. However, since the second pocket of these portions has a large length dimension in the circumferential direction, the ball 4 incorporated in the second pocket of these portions,
4 does not come into contact with the inner surface of the circumferential end of each of these second pockets. Further, the balls 4, 4 already incorporated in the first pocket of the portion are hardly displaced in the circumferential direction, since both the first pockets are present in the direction perpendicular to the bending direction of the central axes. Therefore, the center axis of the inner ring 2 and the center axis of the outer ring 3 are sufficiently bent,
The balls 4, 4 can be incorporated in the third pocket of the above-mentioned portion.

As is clear from the description of the first to fourth examples of the embodiment of the present invention shown in FIGS. 2, 4, 5, and 6, the ball 4 held in the pocket of the portion (or portion) 4
The magnitude of the swivel angle of the retainer indicated by the dashed arrow in each drawing accompanying the pressing in the circumferential direction by It is the same as the pocket length (angle). In other words, the sum of the lengths of the pair of pockets contained within the grooves dividing the pitch line of each [delta] (angle) becomes gamma _0. Therefore, with respect to the length of the groove division pitch of a pair falling within line pocket (displacement angle of the ball 4, 4 in the pocket), the portion (or portions) from ₁ length gamma pocket (gamma ₀ - γ ₁ )
And the length of the pocket of the adjacent portion (or portion) corresponding to this change is (γ ₀ −γ ₁ ) to γ
_{Even if} it changes to _{1, the} column angle γ _P sandwiched between the pair of pockets becomes equal. That is, in the examples shown in FIGS. 2, 4, 5, and 6, the lengths of a pair of pockets are defined in specific sections, respectively.
₀ ) is maintained, the lengths of both pockets can be freely set within the range of γ ₁ to (γ ₀ −γ ₁ ).

[0047]

Since the constant velocity joint of the present invention is constructed and operates as described above, the outer diameter can be reduced by setting the number of balls for transmitting rotational force to eight or more. By increasing the rigidity of the cage for holding each ball, the durability of the cage can be improved. Therefore, it is possible to reduce the size and weight of the wheel rolling bearing unit, which is called the fourth generation hub unit and integrally incorporates a constant velocity joint, while securing sufficient durability.

[Brief description of the drawings]

FIG. 1 is a table and a schematic diagram comparing first to fifth examples of the embodiment of the present invention each corresponding to any one of claims 2 to 6 with a conventional structure.

FIG. 2 is a schematic view of a retainer incorporated in a first example of an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a retainer corresponding to an upper part of FIG. 2;

FIG. 4 is a schematic view of a retainer incorporated in a second example of the embodiment of the present invention.

FIG. 5 is a schematic view showing a third example.

FIG. 6 is a schematic view showing a fourth example.

FIG. 7 is a schematic view showing a fifth example.

FIG. 8 is a sectional view showing a first example of a conventional constant velocity joint in a state where a joint angle is given.

FIG. 9 is also shown without a joint angle;
FIG. 9 is a view corresponding to the AA cross section in FIG. 8.

FIG. 10 is a view of a part of the retainer as viewed from the outer peripheral side.

FIG. 11 is a schematic diagram showing the positional relationship between the bottom surfaces of the inner and outer engagement grooves.

FIG. 12 is a sectional view showing an example of a rolling bearing unit for a wheel in which a constant velocity joint is integrally incorporated.

FIG. 13 is a sectional view showing a second example of a conventional constant velocity joint in a state where a joint angle is not provided.

FIG. 14 is a sectional view taken along line BB of FIG. 13;

FIG. 15 is a sectional view of a retainer incorporated in a second example of the conventional structure.

FIG. 16 is a cross-sectional view showing a state where the inner ring and the outer ring are displaced in a predetermined direction in order to incorporate the ball into the retainer.

FIG. 17 is a schematic view of a retainer incorporated in a second example of the conventional structure.

[Explanation of symbols]

 1, 1a, 1b constant velocity joint 2 inner ring 2a outer peripheral surface 3, 3A outer ring 3a inner peripheral surface 4 ball 5 shaft 6 shaft 7 inner engaging groove 7a bottom surface 8 outer engaging groove 8a bottom surface 9, 9a retainer 10, 10a, 10b pocket 11 outer ring 12 first mounting flange 13 outer ring track 14 first inner ring member 15 second inner ring member 16 hub 17 second mounting flange 18 first inner ring track 19 cylindrical portion 20 second inner ring track 21 rolling Moving body 22 Locking groove 23 Locking groove 24 Retaining ring 25 Step 26 Welding 27a, 27b Cover 28a, 28b Seal ring 29 Partition plate 30 Column

Claims (10)

[Claims] 1. An inner ring having an arcuate cross-section formed at right angles to the circumferential direction at eight or more even-numbered positions located at equal circumferential positions on the outer peripheral surface of the inner ring. A mating groove, an outer ring provided around the inner ring, and an outer portion having an arc-shaped cross section formed at a position facing the inner engaging grooves on the inner peripheral surface of the outer ring in a direction perpendicular to the circumferential direction. A retainer sandwiched between an engaging groove, an outer peripheral surface of the inner ring and an inner peripheral surface of the outer ring, and having a plurality of circumferentially long pockets formed at positions matching the inner and outer engaging grooves. And eight or more even-numbered balls that are allowed to roll along both the inner and outer engagement grooves while being held inside each of these pockets. The axis intersection angle between the center axis of the outer ring and the center axis of the outer ring is bisected, and a plane including both center axes In a constant velocity joint arranged in a bisecting plane orthogonal to the above, at least two types of pockets having different lengths in the circumferential direction are provided as the plurality of pockets, and these pockets are arranged in the circumferential direction. Arranging the balls in the respective pockets while securing the length in the circumferential direction of the pillar portion between the adjacent pockets in the circumferential direction. A constant velocity joint characterized by the fact that it has become possible. 2. The number of pockets provided in each of the inner and outer engaging grooves and the retainer is eight, and the groove dividing pitch angle δ of both the inner and outer engaging grooves is (360 ° / 8 = 45 °). A straight line portion where a plane including the center axis of the inner ring and the center axis of the outer ring intersects the bisector is used as a reference line, and exists on this bisector, and the intersection of the two center axes and the two The groove dividing pitch line and the reference line passing through the center position in the circumferential direction of the engaging groove,
The angle formed at the intersection is β, and after the retainer is assembled between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, the ball is placed in any one of a plurality of pockets provided in the retainer. When a ball is held in a pocket circumferentially adjacent to the pocket when the ball is assembled, the maximum value γ ₀ of the displacement angle of the ball in the circumferential direction is determined in the mounting. Assuming that the maximum value of the inclination angle of the center axis of the retainer with respect to the center axis of the inner ring and the center axis of the outer ring is θ ₀ , γ ₀ = δ−tan ⁻¹ (t
anδ · cosθ ₀ ), and after the assembly is completed, the maximum value γ ₁ of the displacement angle in the circumferential direction of the ball held in the pocket during use during use is determined by the center axis of the inner ring and the outer ring during use. Assuming that the maximum value of the inclination angle of the center axis of the cage with respect to the center axis is θ _1, and β is an angle in a range of 45 to 50 °, γ ₁ ≒ β-tan ^-1
(Tanβ · cosθ ₁ ), the outside diameter of the ball is D _a, and the outside diameter of the cage is D _c
In this case, a first straight line connecting a point at which the rolling surface of the ball contacts the inner surface at the circumferential end of the pocket and the central axis of the cage, and the central axis and the central point of the ball Half angle γ _B of the ball, which is the angle of intersection with the second straight line connecting
Is γ _B = sin ⁻¹ (D _a / D _c ), and within a range of the groove division pitch angle δ, a pair of balls allowed in a pair of pockets sandwiching the pillar portion is provided. the sum of the displacement angle and gamma _T, a very small angle to correspond to the sum of the angle about the central axis of the retainer of these machining error and margin of each pocket △ and gamma, which is held in the pocket the ball, When the length of the space in the circumferential direction occupied with its own outer diameter and some margin is defined as A corresponding to the angle with respect to the center axis of the cage, A = 2γ _B
+ △ γ, and the column angle γ _P in which the circumferential length of the column on the outer diameter surface of the cage corresponds to the angle with respect to the center axis of the cage is γ _P = δ−γ _T is -A, 4 having the four first column portion having a pillar angle gamma _P asked to gamma _T as gamma _0, respectively, the pillar angle gamma _P obtained each gamma _T as (γ ₀ + γ ₁₎ The first and second columns are formed as a pair, and the first and second columns are alternately arranged in the circumferential direction. Then, the dividing pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of the first and second pockets adjacent to each other in the circumferential direction and the center axis of the retainer, is (δ ± γ ₁ /
2), and a two positions one set location is ([delta]-gamma _1/2) with the division pitch angle is located with the two positions pair is _{(δ + γ 1/2)} , (δ + γ 1/2) It was placed alternately and location of the set is the location of the set and is (δ-γ _1/2) in the circumferential direction, a constant velocity joint according to claim 1. 3. The ball is moved circumferentially (2γ ₀ −γ
₁ ) The first pocket that is held displaceable by 2 minutes
3. The constant velocity joint according to claim 2, wherein the second pockets that are displaceably held for _one minute are alternately arranged in the circumferential direction. 4. The number of pockets provided in each of the inner and outer engaging grooves and the retainer is eight, and the groove dividing pitch angle δ of the inner and outer engaging grooves is (360 ° / 8 = 45 °). A straight line portion where a plane including the center axis of the inner ring and the center axis of the outer ring intersects the bisector is used as a reference line, and exists on this bisector, and the intersection of the two center axes and the two The groove dividing pitch line and the reference line passing through the center position in the circumferential direction of the engaging groove,
The angle formed at the intersection is β, and after the retainer is assembled between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, the ball is placed in any one of a plurality of pockets provided in the retainer. When a ball is held in a pocket circumferentially adjacent to the pocket when the ball is assembled, the maximum value γ ₀ of the displacement angle of the ball in the circumferential direction is determined in the mounting. Assuming that the maximum value of the inclination angle of the center axis of the retainer with respect to the center axis of the inner ring and the center axis of the outer ring is θ ₀ , γ ₀ = δ−tan ⁻¹ (t
anδ · cosθ ₀ ), and after the assembly is completed, the maximum value γ ₁ of the displacement angle of the ball held in the pocket in the circumferential direction at the time of use during use is determined by the center axis of the inner ring and the outer ring at the time of use. Assuming that the maximum value of the inclination angle of the center axis of the cage with respect to the center axis is θ _1, and β is an angle in a range of 45 to 50 °, γ ₁ ≒ β-tan ^-1
(Tanβ · cosθ ₁ ), the outside diameter of the ball is D _a, and the outside diameter of the cage is D _c
In this case, a first straight line connecting a point at which the rolling surface of the ball contacts the inner surface at the circumferential end of the pocket and the central axis of the cage, and the central axis and the central point of the ball Half angle γ _B of the ball, which is the angle of intersection with the second straight line connecting
Is γ _B = sin ⁻¹ (D _a / D _c ), and within a range of the groove division pitch angle δ, a pair of balls allowed in a pair of pockets sandwiching the pillar portion is provided. the sum of the displacement angle and gamma _T, a very small angle to correspond to the sum of the angle about the central axis of the retainer of these machining error and margin of each pocket △ and gamma, which is held in the pocket the ball, When the length of the space in the circumferential direction occupied with its own outer diameter and some margin is defined as A corresponding to the angle with respect to the center axis of the cage, A = 2γ _B
+ △ γ, and the column angle γ _P in which the circumferential length of the column on the outer diameter surface of the cage corresponds to the angle with respect to the center axis of the cage is γ _P = δ−γ _T is -A, 4 having the four first column portion having a pillar angle gamma _P asked to gamma _T as gamma _0, respectively, the pillar angle gamma _P obtained each gamma _T as (γ ₀ + γ ₁₎ The first and second columns are formed as a pair, and the first and second columns are alternately arranged in the circumferential direction. At the same time, the division pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of a pair of pockets adjacent in the circumferential direction and the center axis of the retainer, is (δ ± γ). ₀ /
4), and as the division pitch angle (δ + γ _0/4) at a place with a two positions one set _{(δ-γ 0/4)} 2 positions pair place is, (δ + γ _0/4) a location of the set is the location of the set and is _{(δ-γ 0/4)} , arranged alternately in the circumferential direction, a constant velocity joint according to claim 1. 5. Four first pockets for holding the ball displaceably in the circumferential direction by 1.5γ ₀ ,
₀ only and two second pocket displaceably held, also 2 [gamma ₁ only and two third pocket displaceably held, respectively the second on both sides of the respective first pocket, a third pocket presence The constant velocity joint according to claim 4, wherein the constant velocity joint is arranged in a state in which the joint moves. 6. The number of pockets provided in both the inner and outer engaging grooves and the retainer is eight, and the groove dividing pitch angle δ of both the inner and outer engaging grooves is (360 ° / 8 = 45 °). A straight line portion where a plane including the center axis of the inner ring and the center axis of the outer ring intersects the bisector is used as a reference line, and exists on this bisector, and the intersection of the two center axes and the two The groove dividing pitch line and the reference line passing through the center position in the circumferential direction of the engaging groove,
The angle formed at the intersection is β, and after the retainer is assembled between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, the ball is placed in any one of a plurality of pockets provided in the retainer. When a ball is held in a pocket circumferentially adjacent to the pocket when the ball is assembled, the maximum value γ ₀ of the displacement angle of the ball in the circumferential direction is determined in the mounting. Assuming that the maximum value of the inclination angle of the center axis of the retainer with respect to the center axis of the inner ring and the center axis of the outer ring is θ ₀ , γ ₀ = δ−tan ⁻¹ (t
anδ · cosθ ₀ ), and after the assembly is completed, the maximum value γ ₁ of the displacement angle of the ball held in the pocket in the circumferential direction at the time of use during use is determined by the center axis of the inner ring and the outer ring at the time of use. Assuming that the maximum value of the inclination angle of the center axis of the cage with respect to the center axis is θ _1, and β is an angle in a range of 45 to 50 °, γ ₁ ≒ β-tan ^-1
(Tanβ · cosθ ₁ ), the outside diameter of the ball is D _a, and the outside diameter of the cage is D _c
In this case, a first straight line connecting a point at which the rolling surface of the ball contacts the inner surface at the circumferential end of the pocket and the central axis of the cage, and the central axis and the central point of the ball Half angle γ _B of the ball, which is the angle of intersection with the second straight line connecting
Is γ _B = sin ⁻¹ (D _a / D _c ), and within a range of the groove division pitch angle δ, a pair of balls allowed in a pair of pockets sandwiching the pillar portion is provided. the sum of the displacement angle and gamma _T, a very small angle to correspond to the sum of the angle about the central axis of the retainer of these machining error and margin of each pocket △ and gamma, which is held in the pocket the ball, When the length of the space in the circumferential direction occupied with its own outer diameter and some margin is defined as A corresponding to the angle with respect to the center axis of the cage, A = 2γ _B
+ △ γ, and the column angle γ _P in which the circumferential length of the column on the outer diameter surface of the cage corresponds to the angle with respect to the center axis of the cage is γ _P = δ−γ _T is -A, 4 having the four first column portion having a pillar angle gamma _P asked to gamma _T as gamma _0, respectively, the pillar angle gamma _P obtained each gamma _T as (γ ₀ + γ ₁₎ The first and second columns are formed as a pair, and the first and second columns are alternately arranged in the circumferential direction. At the same time, the dividing pitch angle of the pocket, which is the intersection angle between two straight lines connecting the circumferential center positions of a pair of circumferentially adjacent pockets and the central axis of the retainer, is [δ ± ｛]. (Γ
₀₋ γ ₁ ) / 2}], and the divided pitch angle is [δ +
[(Γ ₀ −γ ₁ ) / 2}] is a set of two places, and a place of [δ − {(γ ₀ −γ ₁ ) / 2}] is a set of two places, and [δ + {(Γ ₀ −γ ₁ ) / 2}] and a set of locations [δ − {(γ ₀ −γ ₁ ) / 2}] are alternately arranged in the circumferential direction. The constant velocity joint according to claim 1, wherein the joint is arranged. 7. The ball is moved along the circumferential direction by ｛2 (γ ₀ −
two first pockets that are displaceably held by γ ₁ )｝, four second pockets that are also displaceable by (γ ₀ + γ ₁ ), and two second pockets that are also displaceable by 2γ ₁ 7. The constant velocity joint according to claim 6, wherein the third pocket and the second pocket are arranged in a state where the first and third pockets are present on both sides of each of the second pockets. 8. The number of pockets provided in each of the inner and outer engaging grooves and the retainer is eight, and the groove dividing pitch angle δ of the inner and outer engaging grooves is (360 ° / 8 = 45 °). A straight line portion where a plane including the center axis of the inner ring and the center axis of the outer ring intersects the bisector is used as a reference line, and exists on this bisector, and the intersection of the two center axes and the two The groove dividing pitch line and the reference line passing through the center position in the circumferential direction of the engaging groove,
The angle formed at the intersection is β, and after the retainer is assembled between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, the ball is placed in any one of a plurality of pockets provided in the retainer. When a ball is held in a pocket circumferentially adjacent to the pocket when the ball is assembled, the maximum value γ ₀ of the displacement angle of the ball in the circumferential direction is determined in the mounting. Assuming that the maximum value of the inclination angle of the center axis of the retainer with respect to the center axis of the inner ring and the center axis of the outer ring is θ ₀ , γ ₀ = δ−tan ⁻¹ (t
anδ · cosθ ₀ ), and after the assembly is completed, the maximum value γ ₁ of the displacement angle of the ball held in the pocket in the circumferential direction at the time of use during use is determined by the center axis of the inner ring and the outer ring at the time of use. Assuming that the maximum value of the inclination angle of the center axis of the cage with respect to the center axis is θ _1, and β is an angle in a range of 45 to 50 °, γ ₁ ≒ β-tan ^-1
(Tanβ · cosθ ₁ ), the outside diameter of the ball is D _a, and the outside diameter of the cage is D _c
In this case, a first straight line connecting a point at which the rolling surface of the ball contacts the inner surface at the circumferential end of the pocket and the central axis of the cage, and the central axis and the central point of the ball Half angle γ _B of the ball, which is the angle of intersection with the second straight line connecting
Is γ _B = sin ⁻¹ (D _a / D _c ), and within a range of the groove division pitch angle δ, a pair of balls allowed in a pair of pockets sandwiching the pillar portion is provided. the sum of the displacement angle and gamma _T, a very small angle to correspond to the sum of the angle about the central axis of the retainer of these machining error and margin of each pocket △ and gamma, which is held in the pocket the ball, When the length of the space in the circumferential direction occupied with its own outer diameter and some margin is defined as A corresponding to the angle with respect to the center axis of the cage, A = 2γ _B
+ △ γ, and the column angle γ _P in which the circumferential length of the column on the outer diameter surface of the cage corresponds to the angle with respect to the center axis of the cage is γ _P = δ−γ a _T -A, 6 having two and the first column portion having a pillar angle gamma _P obtained as gamma ₀ to gamma _T respectively, the pillar angle gamma _P asked to gamma _T respectively as (γ ₀ + γ ₁₎ And the second pillars are arranged in such a manner that the first pillars are adjacent to each other in the circumferential direction, and the center positions in the circumferential direction of a pair of pockets adjacent in the circumferential direction and the center axis of the retainer. , Which is the intersection angle of two straight lines connecting
₀₋ γ ₁ ) / 2}], and the divided pitch angle is [δ +
[(Γ ₀ −γ ₁ ) / 2}] is a set of two places, and a place of [δ − {(γ ₀ −γ ₁ ) / 2}] is a set of two places, and [δ + {(Γ ₀ −γ ₁ ) / 2}] and a set of locations [δ − {(γ ₀ −γ ₁ ) / 2}] are alternately arranged in the circumferential direction. The constant velocity joint according to claim 1, wherein the joint is arranged. 9. A one first pocket to hold the ball only 2 [gamma ₀ in the circumferential direction displaceably, like 2 (gamma
_0- γ ₁ ), one second pocket which is displaceable by (γ ₀ + γ ₁ ), four third pockets which are also displaceable by (γ ₀ + γ ₁ ), and 2 which are also displaceable by 2γ _1. The first pocket and the second pocket are diametrically opposite to each other, and the fourth pocket is substantially located between the first and second pockets with respect to the circumferential direction of the retainer. 9. The constant velocity joint according to claim 8, wherein the constant velocity joint is located in a central portion and arranged so that the third pocket exists between the fourth pocket and the first pocket or the second pocket adjacent in the circumferential direction. 10. The inner and outer engaging grooves and the number of pockets provided in the retainer are each eight, and the groove dividing pitch angle δ of the inner and outer engaging grooves is (360 ° / 8 = 45 °). A straight line portion where a plane including the center axis of the inner ring and the center axis of the outer ring intersects the bisector is used as a reference line, and exists on this bisector, and the intersection of the two center axes and the two The groove dividing pitch line and the reference line passing through the center position in the circumferential direction of the engaging groove,
The angle formed at the intersection is β, and after the retainer is assembled between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, the ball is placed in any one of a plurality of pockets provided in the retainer. When a ball is held in a pocket circumferentially adjacent to the pocket when the ball is assembled, the maximum value γ ₀ of the displacement angle of the ball in the circumferential direction is determined in the mounting. Assuming that the maximum value of the inclination angle of the center axis of the retainer with respect to the center axis of the inner ring and the center axis of the outer ring is θ ₀ , γ ₀ = δ−tan ⁻¹ (t
anδ · cosθ ₀ ), and after the assembly is completed, the maximum value γ ₁ of the displacement angle of the ball held in the pocket in the circumferential direction at the time of use during use is determined by the center axis of the inner ring and the outer ring at the time of use. Assuming that the maximum value of the inclination angle of the center axis of the cage with respect to the center axis is θ _1, and β is an angle in a range of 45 to 50 °, γ ₁ ≒ β-tan ^-1
(Tanβ · cosθ ₁ ), the outside diameter of the ball is D _a, and the outside diameter of the cage is D _c
In this case, a first straight line connecting a point at which the rolling surface of the ball contacts the inner surface at the circumferential end of the pocket and the central axis of the cage, and the central axis and the central point of the ball Half angle γ _B of the ball, which is the angle of intersection with the second straight line connecting
Is γ _B = sin ⁻¹ (D _a / D _c ), and within a range of the groove division pitch angle δ, a pair of balls allowed in a pair of pockets sandwiching the pillar portion is provided. the sum of the displacement angle and gamma _T, a very small angle to correspond to the sum of the angle about the central axis of the retainer of these machining error and margin of each pocket △ and gamma, which is held in the pocket the ball, When the length of the space in the circumferential direction occupied with its own outer diameter and some margin is defined as A corresponding to the angle with respect to the center axis of the cage, A = 2γ _B
+ △ γ, and the column angle γ _P in which the circumferential length of the column on the outer diameter surface of the cage corresponds to the angle with respect to the center axis of the cage is γ _P = δ−γ _T− A, and the cylinder angle γ obtained by setting γ _T to (γ ₀ + γ ₁ ), respectively.
_The eight pillars having _P are arranged at unequal intervals in the circumferential direction, and the center positions in the circumferential direction of a pair of pockets adjacent in the circumferential direction and the center axis of the retainer are set. The division pitch angle of the pocket, which is the intersection angle between two connecting straight lines, is [δ ± {(γ ₀ −γ ₁ ) / 2}], and this division pitch angle is [δ + ｛(γ ₀ −γ ₁ )]. / 2｝] as a set of two places and [δ − ｛(γ ₀ −γ ₁ ) / 2}] as a set of two places, [δ + ｛(γ ₀ −γ ₁ )].
/ 2｝] and [δ − ｛(γ ₀ −γ ₁ ) /
2｝] are alternately arranged in the circumferential direction so that two first pockets hold the ball so as to be displaceable by 2γ ₀ in the circumferential direction; Similarly (γ
₀ + γ ₁ ) and two third pockets which are also displaceable by 2γ ₁ , and two first pockets which are diametrically opposite positions of the retainer. And two third pockets are provided at a substantially central position between the first pockets with respect to the circumferential direction of the retainer, and the third pocket is provided between the first and third pockets adjacent in the circumferential direction. Arranged in a state of providing four second pockets,
The constant velocity joint according to claim 1.