JP2008274973A - Fixed type constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed type constant velocity universal joint capable of being smoothly rotated under the conditions of a high operating angle and a high torque load for reducing a load on a cage while securing durability. <P>SOLUTION: A curvature center O1 of a track groove 22 of an outward member and a curvature center O2 of a track groove 25 of an inward member are offset an equal distance from a joint center O in opposition to the axil direction. A curvature center O3 of an outer spherical face 28a of the cage 28 and a curvature center O4 of an inner spherical face 28b of the cage 28 are offset an equal distance from the joint center O in opposition to the axial direction. The offset amount of the cage 28 is greater to be almost the same as the offset amount between the track groove 22, 25. A groove 41 is provided in a joint opening side thick portion 40 of the cage 28 at the same pitch as that of a pocket 29. In the state that an axial line L2 of the inward member corresponds to an axial line L1 of the cage 28, a protruded portion 42 between the track grooves neighboring each other in the peripheral direction of the inward member is fitted into the groove 41 of the cage 28 along the axial direction. Thereby, the inward member is incorporated in the cage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fixed type constant velocity universal joint and a method of manufacturing the same, and more particularly, is used in a power transmission system of an automobile or various industrial machines, and only allows angular displacement between two axes of a driving side and a driven side. The present invention relates to a fixed type constant velocity universal joint.

  For example, there is a fixed type constant velocity universal joint as a kind of constant velocity universal joint used as means for transmitting rotational force from an engine of an automobile to wheels at a constant speed. This fixed type constant velocity universal joint has a structure in which two shafts on the driving side and the driven side are connected and the rotational torque can be transmitted at a constant speed even if the two shafts have an operating angle. In general, as the above-mentioned fixed type constant velocity universal joint, a Barfield type (BJ) and an undercut free type (UJ) are widely known.

  For example, as shown in FIGS. 10 and 11, the UJ type fixed type constant velocity universal joint is an outer member in which a plurality of track grooves 2 are formed in the inner spherical surface 1 along the axial direction at equal intervals in the circumferential direction. An outer ring 3, an inner ring 6 as an inner member in which a plurality of track grooves 5 paired with the track grooves 2 of the outer ring 3 are formed on the outer spherical surface 4 along the axial direction at equal intervals in the circumferential direction, and the outer ring 3 Between the track groove 2 of the inner ring 6 and the track groove 5 of the inner ring 6 to transmit torque, and between the inner spherical surface 1 of the outer ring 3 and the outer spherical surface 4 of the inner ring 6, the balls 7 And a cage 8 for holding the The cage 8 is provided with a plurality of pockets 9 for accommodating the balls 7 along the circumferential direction.

  The track groove 2 of the outer ring 3 includes a back-side track groove 2a in which the track groove bottom is an arc portion and an opening-side track groove 2b in which the track groove bottom is a straight portion parallel to the outer ring axis. The back side track groove 2a has its center of curvature O1 shifted from the joint center O in the axial direction toward the opening side of the outer ring 3. The track groove 5 of the inner ring 6 includes a back side track groove 5a in which the track groove bottom is a straight portion parallel to the inner ring axis, and an opening side track groove 5b in which the track groove bottom is an arc portion. The center of curvature O2 of the opening side track groove 5b is provided at an equal distance k away from the joint center O in the axial direction on the back side opposite to the center of curvature O1 of the back side track groove 2a of the outer ring 3.

  The outer spherical surface 8a of the cage shifts its center of curvature O3 from the joint center O in the axial direction toward the opening side of the cage 8. The inner spherical surface 8b of the cage has the center of curvature O4 in the axial direction from the joint center O. Is provided on the far side opposite to the center of curvature O3 by an equal distance k1. In this type of conventional constant velocity universal joint, the track offset amount of the inner and outer rings is increased, and the offset amount of the cage is decreased. The pitch angle between two adjacent balls 7 is 60 degrees. That is, six balls 7 are arranged at a pitch of 60 degrees along the circumferential direction.

  By the way, in recent years, it has been demanded that the fixed type constant velocity universal joint can be reduced in size and the torque load capacity can be increased. As a method for reducing the size of the fixed type constant velocity universal joint having six balls and increasing the torque load capacity, it is conceivable to place the largest possible ball on the smallest possible PCD. However, when a large ball is used, the column (window column) between the pockets of the cage becomes thin, and the rigidity of the cage decreases. In particular, for a torsional torque load at a high angle, the cage is easily damaged, which causes a decrease in strength of the constant velocity universal joint.

  As shown in FIG. 10, when the track offset amount of the inner and outer rings is large and the offset amount of the cage is small, the depth of the track groove on the inner side of the outer ring becomes shallow, and the torque load capacity at high angles becomes small. That is, the ball tends to ride on the track edge with respect to a torque load at a high angle, and an excessive stress is generated at the edge portion. For this reason, damage due to chipping of the edge portion or a locking phenomenon with the cage due to plastic deformation occurs. These damages and lock phenomena deteriorate the operability, reduce the durability life, and cause the cage to break. In addition, the inner ring has a shallower track depth on the back side, and has the same drawbacks as the outer ring. For this reason, improvement of joint strength and durability in a high angle region is a conventional problem.

  Therefore, conventionally, by increasing the circumferential length dimension of the pillar portion existing between the pockets adjacent in the circumferential direction to ensure the durability of the cage, the durability of the entire constant velocity universal joint is improved. There is one designed to improve (Patent Document 1). That is, the one described in Patent Document 1 stores a plurality of balls in one pocket, thereby narrowing the interval between the balls stored in the same pocket, and between adjacent pockets in the circumferential direction. In this case, the circumferential length of the pillar portion existing in is increased, and the number of balls is seven or more.

Conventionally, there is one in which two are stored in each pocket of the cage to suppress periodic fluctuation of the moment during rotation (Patent Document 2). That is, the thing of this patent document 2 makes the circumferential direction length of one window pillar large by making all the pockets of a cage into the long window which made the circumferential direction space | interval large.
Japanese Patent Laid-Open No. 11-303882 British patent 1537067

  In the thing of patent document 1, the circumferential direction length dimension of the pillar part which exists between pockets adjacent in the circumferential direction is enlarged by accommodating a plurality of balls in a pocket, and the durability of the cage In order to ensure, the durability of the constant velocity universal joint as a whole is improved. However, the one described in Patent Document 1 is based on the premise that the number of balls is seven or more, and in the case of having six balls, the load capacity decreases at high angles and the contact between the inner ring and the cage inner spherical surface. It is not intended to prevent an increase in surface pressure.

  Moreover, in the thing of patent document 2, two pieces are accommodated in each pocket of a cage, and like the said patent document 1, the whole number of pockets is decreased and the circumferential direction length of a window pillar is enlarged. . For this reason, even in this case, it is not possible to prevent a decrease in load capacity at a high angle and an increase in contact surface pressure between the inner ring and the cage inner spherical surface.

  By the way, if the cage wall thickness on the joint opening side is increased, it can be proposed to improve the rigidity of the cage window frame on the joint opening side, thereby ensuring the strength at the high angle.

  However, when the cage wall thickness on the joint opening side is increased, it becomes difficult to incorporate the inner ring into the cage 8. Therefore, in the cage 8 shown in FIGS. 12 to 14, since a large load is applied to the opening side of the pocket 9, a thick portion 10 is formed on the joint opening side, and a cutout portion for incorporating an inner ring (inner member) is formed. 11 is provided on the inner diameter surface of the joint back side, and the joint back side is a thin portion 12.

  As shown in FIG. 15, the inner ring 6 is inserted into the cage 8 shown in FIGS. 12 to 14 through a notch 11 for installation. That is, the center axis (axis line) L1 of the cage 8 is arranged so as to make a right angle with respect to the center axis (axis line) L2 of the inner ring 6, and then the inner ring 6 is rotated 90 ° for incorporation.

  However, in the case shown in FIGS. 12 to 14, the cage 8 is inferior in durability because the thin portion 12 is formed on the deep side of the joint as described above.

  Moreover, as shown in FIGS. 16-18, the notch part 13 can be provided in the internal diameter surface by the side of the joint opening of the cage 8, and the thickness of the joint back | inner side can be set thickly. Also in this case, the central axis L1 of the cage 8 is arranged so as to be perpendicular to the central axis L2 of the inner ring 6, and is inserted from the notch 13 as shown in FIG. ° Rotate and install.

  However, in the case shown in FIGS. 16 to 19, the spherical surface portion is eliminated on the inner diameter surface on the joint opening side, and the contact area between the inner ring 6 and the outer spherical surface is reduced. For this reason, there is a possibility of hindering smooth rotational movement as a constant velocity universal joint.

  In view of the above problems, the present invention provides a fixed type constant velocity universal joint that can rotate smoothly even at high operating angles and high torque loads, reduce the load on the cage, and ensure durability. .

  The fixed type constant velocity universal joint according to the present invention includes an outer member having a plurality of track grooves formed on an inner spherical surface, an inner member having a plurality of track grooves formed on the outer spherical surface, and a track groove of the outer member. A plurality of balls that are interposed between the track grooves of the inner member and the track groove of the inner member, and a cage that has a pocket for accommodating the balls and is interposed between the outer member and the inner member. In the fixed type constant velocity universal joint provided, the center of curvature of the track groove of the outer member and the center of curvature of the track groove of the inner member are offset in the axial direction oppositely by an equal distance from the joint center, The center of curvature of the outer spherical surface of the cage and the center of curvature of the inner spherical surface of the cage are offset in the axial direction by an equal distance from the joint center, and the offset amount of the cage is substantially the same as the offset amount of the track groove. Enlarge With the axial line of the inner member and the axial line of the cage aligned, the inner member into the cage is allowed to fit along the axial direction of the protrusion between the track grooves adjacent to each other in the circumferential direction of the inner member. Are provided at the opening-side thick portion of the cage at the same pitch as the pockets.

  In the fixed type constant velocity universal joint according to the present invention, the center of curvature of the track groove of the outer member and the center of curvature of the track groove of the inner member are offset in the axial direction opposite to each other by an equal distance from the joint center. The center of curvature of the outer spherical surface of the cage and the center of curvature of the inner spherical surface of the cage are offset in the opposite axial direction by an equal distance from the joint center, and the offset amount of the cage is substantially equal to the offset amount of the track groove. Increased to be the same. Accordingly, it is possible to prevent the depth of the track groove on the joint back side from becoming shallow, and to increase the thickness (diameter thickness) of the cage on the joint opening side.

  In addition, the groove provided on the joint opening side thick part of the cage allows the inner member to be incorporated into the cage. A large inner sphere area can be secured. Also on the joint opening side of the cage, it is not necessary to form a notch that eliminates the spherical portion, and the area of the spherical portion can be secured.

  The cage pocket has four pairs of a pair of long pockets having a large circumferential interval and a pair of short pockets having a small circumferential interval, and the pair of long pockets are shifted by 180 degrees along the circumferential direction. In addition, the pair of short pockets are shifted 180 degrees along the circumferential direction, the long pockets and the short pockets are alternately arranged along the circumferential direction, and the two pockets are accommodated in the long pockets. May contain one ball. Thereby, the number of window pillars between the pockets of the cage can be four, and the circumferential length of one window pillar can be increased. That is, the rigidity of each cage window column can be increased.

  The pitch angle on the PCD of the two balls accommodated in the long pockets was made smaller than 60 degrees, and the pitch angles of the other balls were made larger than 60 degrees. Thereby, the distance between the pitches of the two balls stored in the long pocket is reduced, and the distance between the pitches of the track grooves of the outer member corresponding thereto is reduced.

  As the fixed type constant velocity universal joint, even if the track groove bottoms of the inner member and the outer member are provided with the arc portion and the straight portion, the track groove bottoms of the inner member and the outer member are the arc portion. A taper part may be provided.

  In the present invention, the offset amount of the cage is increased so as to be substantially the same as the offset amount of the track groove, so that it is possible to prevent the depth of the track groove on the back side of the joint from becoming shallow, and the cage wall on the joint opening side. The thickness (thickness in the radial direction) can be increased. For this reason, it is possible to prevent the ball at a high angle from riding on the track edge, and an excessive stress does not act on the edge. In other words, the torsional torque load capacity at high angles is prevented from decreasing, the high-angle durability life is improved (improved), and the breakage strength due to plastic deformation of the inner and outer track grooves at high angles is improved (improved). Can be planned.

  In particular, on the inner side of the joint of the cage, the diameter of the spigot can be reduced to ensure a large inner sphere area on the inner side of the joint, thereby improving the durability of the cage. On the joint opening side of the cage, it is not necessary to form a notch that eliminates the spherical portion, the area of the spherical portion can be secured, and smooth rotation is possible. In addition, since the inner member does not need to be rotated by 90 ° after the inner member is inserted into the cage, there is an advantage that the assembling work can be simplified.

  Since the rigidity of each cage window column can be increased, a large ball can be arranged on a small PCD, and the size can be reduced without reducing the load capacity. Moreover, the cage can be prevented from being damaged by a torsional torque load at a high angle.

  The distance between the pitches of the two balls stored in the long pocket can be reduced, and the distance between the pitches of the track grooves of the outer member corresponding thereto can be reduced. This facilitates the incorporation of the cage into the outer ring. In particular, the distance between the pitches (the shoulder width dimension between the track grooves) can be made smaller than the pocket width in the cage axis direction, which makes it easier to incorporate the cage into the outer ring and improve the assembly workability. it can.

  If two balls are stored in the long pocket, there is no window column between the balls. Therefore, it is necessary to increase the rigidity of the window frame on the joint opening side that receives a large load from the balls. As described above, by increasing the offset amount of the cage so as to be substantially the same as the offset amount of the track groove, the rigidity of the window frame on the joint opening side can be increased, and two balls are stored in the long pocket. Even with the structure, the strength of the cage can be sufficiently maintained.

  An embodiment of a fixed type constant velocity universal joint according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the fixed type constant velocity universal joint includes an outer ring 23 as an outer member in which a plurality of track grooves 22 are formed in the inner spherical surface 21 along the axial direction at equal intervals in the circumferential direction, and the outer spherical surface. 24, a plurality of track grooves 25 paired with the track grooves 22 of the outer ring 23 are formed along the axial direction at equal intervals in the circumferential direction, and the track grooves 22 and the inner rings 26 of the outer ring 23 are formed as inner members. A plurality of balls 27 that transmit torque by being interposed between the track grooves 25 and a cage 28 that is interposed between the inner spherical surface 21 of the outer ring 23 and the outer spherical surface 24 of the inner ring 26 and holds the balls 27. I have. Pockets 29 are provided in the cage 28 at a predetermined pitch (60 ° pitch in the illustrated example) along the circumferential direction, and the balls 27 are held in the pockets 29.

  The track groove 22 of the outer ring 23 includes a back side track groove 22a in which the track groove bottom is an arc portion and an opening side track groove (straight groove) 22b in which the track groove bottom is a straight portion parallel to the outer ring axis. The back side track groove 22 a has its center of curvature O 1 shifted from the joint center O in the axial direction toward the opening side of the outer ring 23. Further, the track groove 25 of the inner ring 26 includes a back side track groove 25a in which the track groove bottom is a straight portion parallel to the outer ring axis and an opening side track groove 25b in which the track groove bottom is an arc portion. The center of curvature O2 of the opening side track groove 25b is provided at an equal distance k away from the joint center O in the axial direction on the far side opposite to the center of curvature O1 of the back side track groove 22a of the outer ring 23.

  In the cage 28, the center of curvature O3 of the outer spherical surface 28a and the center of curvature O4 of the inner spherical surface 28b are offset in the axial direction by an equal distance k2 with respect to the joint center (cage center) O. The amount is made substantially the same as the offset amount of the track groove.

  For this reason, the outer spherical surface 28a of the cage 28 can form a substantially concentric arc (a concentric arc having different curvature radii) with the groove bottom of the inner track groove 22a of the outer ring 23, and the track groove depth on the inner side of the joint. Can be prevented, and the thickness (diameter thickness) on the opening side of the cage 28 can be increased.

  By the way, as shown in FIGS. 2 to 4, a plurality of grooves 41 are formed in the joint opening side thick portion 40 of the cage 28 at the same pitch as the pockets 29. The groove 41 opens to the joint opening side end face 43 and the pocket 29 and has a trapezoidal cross section. That is, the groove 41 includes an arcuate (spherical) bottom wall 41a and side walls 41b and 41b extending so as to slightly expand from the circumferential end of the bottom wall 41a toward the inner diameter side. The groove 41 may be formed by plastic working or may be formed by machining (cutting or the like).

  As shown in FIGS. 5 to 7 and the like, the groove 41 is configured such that the protrusion 42 between the track grooves 25 adjacent to each other in the circumferential direction of the inner ring 26 can be fitted along the axial direction. That is, as shown in FIG. 6, the circumferential dimension B of the bottom wall 41a of the groove 41 is set larger than the maximum circumferential dimension A of the protrusion 42 of the inner ring 26, and as shown in FIG. The diameter D2 of the arc drawn by the bottom wall 41a is set larger than the maximum outer diameter (maximum outer diameter of the outer spherical surface 24 of the inner ring 26) D1 of the protrusion 42 of the inner ring 26.

  Next, a method for incorporating the inner ring 26 into the cage 28 configured as described above will be described. First, the axis line L2 of the inner ring 26 and the axis line L1 of the cage 28 are made to coincide with each other, and the phases of the protrusion 42 of the inner ring 26 and the groove 41 of the cage 28 are matched.

  At this time, as described above, since the protrusion 42 can be fitted along the axial direction of the groove 41, in this state, as shown in FIGS. 5 to 7, the arrow Y (see FIG. 7) Thus, the inner ring 26 can be fitted into the cage 28. As a result, the inner ring 26 can be incorporated into the cage 28. That is, it is not necessary to rotate the inner ring 26 by 90 ° after the inner ring 26 is fitted into the cage 28.

  In the present invention, the center of curvature O1 of the track groove 22 of the outer ring 23 and the center of curvature O2 of the track groove 25 of the inner ring 26 are offset in the axial direction opposite to the joint center O in the axial direction. The center of curvature O3 of the outer spherical surface 28a and the center of curvature O4 of the inner spherical surface 28b of the cage 28 are offset in the axial direction by an equal distance with respect to the joint center O. The offset amount was increased to be substantially the same as 25 offset amounts. As a result, it is possible to prevent the depth of the track groove on the joint back side from becoming shallow, and to increase the thickness (diameter thickness) of the cage 28 on the joint opening side. For this reason, it is possible to prevent the ball 27 at a high angle from riding on the track edge, and an excessive stress does not act on the edge. That is, a reduction in torsional torque load capacity at high angles is prevented, high angle durability life is improved (improved), and breakage strength is increased due to plastic deformation of the track grooves 25 of the inner ring 26 and the track grooves 22 of the outer ring 23 at high angles ( Improvement).

  Further, since the inner ring 26 can be incorporated into the cage 28 by the groove 41 provided in the joint opening side thick portion 40 of the cage 28, the diameter of the spigot is reduced on the inner side of the joint of the cage 28. A large inner sphere area on the back side of the joint can be secured, and the durability of the cage 28 can be improved. Even on the joint opening side of the cage 28, it is not necessary to form a notch portion that eliminates the spherical surface portion, the area of the spherical surface portion can be ensured, and smooth rotation is possible. In addition, since the inner ring 26 does not need to be rotated by 90 ° after the inner ring 26 is fitted into the cage 28, there is also an advantage that the assembling work can be simplified.

  FIG. 8 shows another embodiment. In this case, the pockets 29 of the cage 28 have four pairs of long pockets 30 having a large circumferential interval and a pair of short pockets 31 having a small circumferential interval. is doing. Then, the pair of long pockets 30 are shifted 180 degrees along the circumferential direction, and the pair of short pockets 31 are shifted 180 degrees along the circumferential direction so that the long pockets 30 and the short pockets 31 are alternately positioned along the circumferential direction. Is arranged. For this reason, there are four window columns 33 (cage window columns) provided between the pockets. The long pocket 30 accommodates two balls 27 and the short pocket 31 accommodates one ball 27.

  The pitch angle e on the PCD of the two balls 27 accommodated in the long pocket 30 is made smaller than 60 degrees, and the pitch angle d of the other balls 27 is made larger than 60 degrees. As shown in FIG. 9, the shoulder width dimension f between the two track grooves of the outer ring 23 corresponding to the long pocket 30 of the cage 8 is set smaller than the pocket width g in the cage axial direction.

  In the constant velocity universal joint of the embodiment shown in FIG. 8, the number of window columns between the pockets of the cage 28 can be four, and the circumferential length of one window column can be increased. Thereby, the rigidity of each cage window column can be increased.

  The pitch angle on the PCD of the two balls accommodated in the long pocket 30 was made smaller than 60 degrees, and the pitch angles of the other balls 27 were made larger than 60 degrees. As a result, the distance between the pitches of the two balls 27 stored in the long pocket 30 is reduced, and the distance between the pitches of the track grooves 22 of the outer ring 23 corresponding thereto is reduced. This facilitates the incorporation of the cage 28 into the outer ring 23. In particular, the pitch distance (track groove shoulder width dimension f) can be made smaller than the pocket width g in the cage axis direction, which makes it easier to incorporate the cage 28 into the outer ring 23 and enhances assembly workability. Can be improved.

  If the two balls 27 are stored in the long pocket 30, the window pillar 33 does not exist between the balls 27. Therefore, it is necessary to increase the rigidity of the window frame on the joint opening side that receives a large load from the balls 27. However, as described above, by increasing the offset amount of the cage 28 so as to be substantially the same as the offset amount of the track grooves 22 and 25, the rigidity of the window frame on the joint opening side can be increased. Even in the structure in which the two balls 27 are accommodated in 30, the strength of the cage 28 can be sufficiently maintained.

  By the way, in the said embodiment, while the curvature center O1 and the curvature center O3 are arrange | positioned in the position shifted slightly, the curvature center O2 and the curvature center O4 are arrange | positioned in the position shifted slightly, Even if O1 and the curvature center O3 are at the same position, the curvature center O2 and the curvature center O4 may be at the same position. Further, when the curvature center O1 and the curvature center O3 are shifted, or when the curvature center O2 and the curvature center O4 are shifted, the shift amount can be arbitrarily set, but the offset amount k and the shift amount (k−k2). Is preferably set as (k−k 2) /k≦0.3. When (k−k 2) / k> 0.3, there is no difference from the conventional fixed type constant velocity universal joint shown in FIG. 10, the track groove depth on the inner side of the joint becomes shallower, and the cage 28 on the opening side becomes smaller. It becomes impossible to increase the wall thickness of the joint, which is below the required strength of the joint (FIG. 20).

  In the above embodiment, the fixed constant velocity universal joint is an undercut free type (UJ) having straight grooves 22b, 25a in the track grooves 22, 25. However, the bar does not have such straight grooves. Field type (BJ) may be used. Moreover, the track groove bottoms of the inner ring 26 and the outer ring 23 may be provided with an arc portion and a tapered portion. In this case, it is preferable to provide the taper portion of the track groove 22 of the outer ring 23 on the opening side and to expand from the back side toward the opening side. This is because the operating angle can be increased.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the number of pockets 29 depends on the number of balls 27 to be used. You can increase or decrease. Also, the track groove shoulder width dimension f, the pocket width g of the cage 28 in the cage axial direction, and the like can be set in consideration of the ease of incorporation of the cage 28 into the outer ring 23 and the like.

It is sectional drawing of the fixed type constant velocity universal joint which shows embodiment of this invention. It is a perspective view of the cage of the fixed type constant velocity universal joint. It is a front view of the cage of the fixed type constant velocity universal joint. FIG. 4 is a cross-sectional view taken along line XX in FIG. 3. It is a perspective view of the cage and inner ring of the fixed type constant velocity universal joint. It is a front view of the cage and inner ring of the fixed type constant velocity universal joint. It is sectional drawing of the cage and inner ring | wheel of the said fixed type constant velocity universal joint. It is sectional drawing of the fixed type constant velocity universal joint which shows other embodiment of this invention. It is sectional drawing of the cage and outer ring | wheel of the fixed type constant velocity universal joint shown in FIG. It is sectional drawing of the conventional fixed type constant velocity universal joint. It is a cross-sectional view of the fixed type constant velocity universal joint of FIG. It is a perspective view of the cage of the fixed type constant velocity universal joint of FIG. It is a front view of the cage of the fixed type constant velocity universal joint of the said FIG. It is sectional drawing of the cage of the fixed type constant velocity universal joint of the said FIG. It is sectional drawing which shows the inner ring | wheel assembly state to the cage of the fixed type constant velocity universal joint of the said FIG. It is a perspective view of the cage of the other conventional fixed type constant velocity universal joint. FIG. 17 is a front view of a cage of the fixed type constant velocity universal joint of FIG. 16. It is sectional drawing of the cage of the fixed type constant velocity universal joint of the said FIG. FIG. 17 is a cross-sectional view showing a state where the inner ring is incorporated in the cage of the fixed type constant velocity universal joint of FIG. 16. It is a figure which shows the relationship between offset amount k and deviation | shift amount (k-k2).

Explanation of symbols

21 inner spherical surface 22 track groove 24 outer spherical surface 25 track groove 27 ball 28 cage 28a outer spherical surface 28b inner spherical surface 29 pocket 30 long pocket 31 short pocket 40 joint opening side thick part 41 groove 42 protrusion

Claims (5)

An outer member having a plurality of track grooves formed on the inner spherical surface, an inner member having a plurality of track grooves formed on the outer spherical surface, and between the track grooves of the outer member and the track grooves of the inner member. In a fixed type constant velocity universal joint including a plurality of balls interposed and transmitting a torque, and a cage having a pocket for accommodating the balls and interposed between an outer member and an inner member,
The center of curvature of the track groove of the outer member and the center of curvature of the track groove of the inner member are offset in the axial direction by an equal distance from the joint center, and the center of curvature of the outer spherical surface of the cage and the cage The center of curvature of the inner spherical surface is offset in the axial direction opposite to the joint center by an equal distance, and the offset amount of this cage is increased to be substantially the same as the offset amount of the track groove. The groove that allows the inner member to be incorporated into the cage by allowing the protrusions between the track grooves adjacent to each other in the circumferential direction of the inner member to be fitted along the axial direction with the axis of A fixed type constant velocity universal joint characterized in that is provided at the joint opening side thick part of the cage at the same pitch as the pocket.   The cage pocket has four pairs of a pair of long pockets having a large circumferential interval and a pair of short pockets having a small circumferential interval, and the pair of long pockets are shifted by 180 degrees along the circumferential direction. In addition, the pair of short pockets are shifted 180 degrees along the circumferential direction, the long pockets and the short pockets are alternately arranged along the circumferential direction, and the two pockets are accommodated in the long pockets. The fixed constant velocity universal joint according to claim 1, wherein one ball is accommodated in the fixed type.   The pitch angle on the PCD of the two balls accommodated in the long pocket is made smaller than 60 degrees, and the pitch angle of the other balls is made larger than 60 degrees. Fixed constant velocity universal joint.   The fixed type constant velocity universal joint according to any one of claims 1 to 3, wherein the track groove bottoms of the inner member and the outer member each have an arc portion and a straight portion.   The fixed type constant velocity universal joint according to any one of claims 1 to 3, wherein the track groove bottoms of the inner member and the outer member include an arc portion and a tapered portion.

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