JP4023932B2 - Constant velocity joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixed type constant velocity joint.
[0002]
[Prior art]
A fixed ball joint shown in FIG. 4 is conventionally known. The constant velocity joint includes a plurality of track grooves 3 formed on the spherical inner surface 2 of the outer ring 1, a plurality of track grooves 6 provided on the spherical outer surface 5 of the inner ring 4, and a space between the outer ring side track groove 3 and the inner ring side track groove 6. The assembled ball 7 is supported by a cage 8 assembled between the outer ring 1 and the inner ring 4, and the center of curvature A of the track groove 3 in the axial section of the outer ring and the center of curvature of the track groove 3 in the axial section of the inner ring. 3 is offset equidistant from side to side with respect to the angle center 0 of the joint.
[0003]
Here, the cage 8 has a plurality of pockets 9 for accommodating the balls 7, and the outer periphery and the inner periphery are provided with a spherical outer surface 10 that is in contact with the spherical inner surface 2 of the outer ring 1 and a spherical outer surface 5 of the inner ring 4. A spherical inner surface 11 is provided for contact guidance.
[0004]
[Problems to be solved by the invention]
Incidentally, in the constant velocity joint shown in FIG. 4, when the outer ring 1 and the inner ring 4 transmit the rotational torque at an angle, the spherical inner surface 2 of the outer ring 1 and the spherical outer surface 10 of the cage 8 are in surface contact with each other. Due to the relative movement, there is a problem that lubrication is lost at the contact portion and heat is generated, and the temperature of the outer ring 1 is likely to rise.
[0005]
In addition, as shown in FIGS. 5 (I) and (II), the cage 8 is incorporated into the outer ring 1 so that the axis of the outer ring 1 and the axis of the cage 8 are orthogonal to each other, and the pocket 9 of the cage 8 is formed in the outer ring. The cage 8 is inserted into the outer ring 1 so as to face between the adjacent track grooves 3, and the center of the spherical inner surface 2 of the outer ring 1 is aligned with the center of the spherical outer surface 10 of the cage 8. The cage 8 is rotated by 90 ° about a straight line orthogonal to the axis, but when the cage 8 is inserted into the outer ring 1, the spherical outer surface 10 of the cage 8 is adjacent to the adjacent outer ring side track groove 3. The cage 8 cannot be inserted into the outer ring 1 by interfering with the opposed inner end of the edge 12 at the entrance.
[0006]
Therefore, in the conventional constant velocity joint, as shown in FIGS. 5 and 6, the chamfer 13 is formed at the inlet of the outer ring 1, and the chamfer 14 is formed at both ends of the edge 12 at the inlet of the track groove 3. Although the cage 8 can be inserted, there is also a problem that the processing of the chamfer 14 formed at the entrance of the track groove 3 is troublesome and the processing cost is high.
[0007]
The first object of the present invention is to suppress the temperature increase of the outer ring, and the second object is to enable the cage to be incorporated without processing the chamfer at the entrance of the track groove.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, the center of the spherical inner surface of the outer ring and the center of the spherical outer surface of the inner ring are the same center, and the curved track groove formed on the spherical inner surface of the outer ring, and the spherical shape of the inner ring A ball is incorporated between curved track grooves provided on the outer surface, and a spherical outer surface in surface contact with the spherical inner surface of the outer ring and a spherical inner surface in surface contact with the spherical outer surface of the inner ring in a cage having a pocket in which the ball is accommodated. In the constant velocity joint, the center of curvature of the track groove in the axial section of the outer ring and the center of curvature of the track groove in the axial section of the inner ring are offset equidistantly to the left and right with respect to the angular center of the constant velocity joint. the two rows of grooves in the spherical outer surface of the vessel extending in the circumferential direction is provided symmetrically with respect to the width center line of the cage, to the inlet of the outer ring side track groove adjacent the groove spacing of the two rows Kicking employs a substantially equal with the structures in the dimension between opposite inner end of the edge.
[0009]
As described above, by forming a groove on the spherical outer surface of the cage, the lubricating oil can be held in the groove. For this reason, when the outer ring and the inner ring transmit torque at an angle, the contact portion between the spherical inner surface of the outer ring and the spherical outer surface of the cage can be lubricated by the lubricating oil held in the groove. For this reason, the temperature rise of the outer ring due to the lack of lubrication can be prevented.
[0010]
In addition, two grooves are provided symmetrically with respect to the width center line of the cage, and the distance between the two grooves is substantially equal to the dimension between the opposite inner ends of the edges at the entrance of the adjacent outer ring side track groove. Thus , when the cage is assembled into the outer ring, it is possible to prevent the cage from interfering with the opposite inner end of the edge at the entrance of the adjacent outer ring-side track groove. For this reason, it is not necessary to form a chamfer at the end of the edge at the entrance of the track groove, and the processing cost can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the constant velocity joint includes an outer ring 20, an inner ring 30, a ball 40 and a cage 50.
[0012]
The outer ring 20 has a shaft 21 at the closed end. The outer ring 20 is provided with a spherical inner surface 22, and a plurality of track grooves 23 are formed at equal intervals on the spherical inner surface 22.
[0013]
On the other hand, the inner ring 30 is provided with a spherical outer surface 31, and a plurality of track grooves 32 that are opposed to the track grooves 23 of the outer ring 20 in the radial direction are formed on the spherical outer surface 31.
[0014]
The center of curvature A of the track groove 23 in the axial section of the outer ring 20 and the center of curvature B of the track groove 32 in the axial section of the inner ring 30 are offset equidistant from side to side with respect to the angle center 0 of the joint.
[0015]
The ball 40 is assembled between the track groove 23 of the outer ring 20 and the track groove 32 of the inner ring 30. The cage 50 for holding the ball 40 is provided with a spherical outer surface 51 in surface contact with the spherical inner surface 22 of the outer ring 20 and a spherical inner surface 52 in surface contact with the spherical outer surface 31 of the inner ring 30. The cage 50 is formed with a plurality of pockets 53 that support the ball 40.
[0016]
On the spherical outer surface 51 of the cage 50, two grooves 54 extending in the circumferential direction are formed symmetrically with respect to the width center line of the cage 50.
[0017]
2 (I) and (II) show a stage in the middle of assembling of the cage 50 in which the cage 50 is inserted into the outer ring 20 with the axis of the cage 50 orthogonal to the axis of the outer ring 20. The interval between the two grooves 54 provided in the cage 50 is substantially equal to the interval between the opposed inner ends 24 a of the edges 24 at the entrance of the adjacent outer ring side track groove 23.
[0018]
As described above, when the interval between the two grooves 54 formed on the spherical outer surface 51 of the cage 50 is substantially equal to the interval between the opposed inner ends 24a of the edges 24 at the entrance of the adjacent outer ring side track groove 23, FIG. As shown in (I) and (II), the outer ring 20 is in a state where the axis of the outer ring 20 and the axis of the retainer 50 are orthogonal to each other and the pocket 53 of the retainer 50 faces between the adjacent outer ring-side track grooves 23. When inserting the cage 50 into the inner ring, the cage 50 can be prevented from interfering with the inner end 24a of the edge 24 at the inlet of the outer ring side track groove 23, and the cage 50 can be smoothly inserted into the outer ring 20. can do.
[0019]
Note that the cage 50 inserted into the outer ring 20 is rotated by 90 ° about a straight line orthogonal to the axis and stored in the outer ring 20.
[0020]
As described above, when the groove 54 is formed in the spherical outer surface 51 of the cage 50, the groove 54 functions as a reservoir for lubricating oil. For this reason, when the outer ring 20 and the inner ring 30 of the constant velocity joint shown in FIG. 1 transmit torque at an angle, the spherical inner surface 22 of the outer ring 20 and the spherical outer surface of the cage 50 are retained by the lubricating oil held in the groove 54. 51 contact surfaces can be lubricated.
[0021]
For this reason, the lack of lubrication at the contact surface between the spherical inner surface 22 and the spherical outer surface 51 can be prevented, and the temperature increase of the outer ring 20 due to friction can be suppressed.
[0022]
【The invention's effect】
As described above, in the present invention, the lubricating oil can be held by the groove formed on the spherical outer surface of the cage, and the lubricating oil lubricates the contact portion between the spherical outer surface of the cage and the spherical inner surface of the outer ring. Therefore, the temperature increase of the outer ring due to the lack of lubrication can be suppressed.
[0023]
In addition, two grooves are formed on the spherical outer surface of the cage symmetrically with respect to the width center of the cage, and the distance between the two grooves is set so that the edge of the adjacent outer ring side track groove is opposed to the edge. When the cage is inserted into the outer ring by inserting the cage into the outer ring so that the axial center of the outer ring and the axis of the cage are orthogonal to each other, the edge of the edge at the inlet of the outer-track track groove is inserted. Can be prevented.
[0024]
For this reason, it is not necessary to form chamfers at both ends of the edge at the entrance of the outer ring side track groove, and the processing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a constant velocity joint according to the present invention. FIG. 2 (I) is a vertical front view showing a state in which a cage is being assembled into an outer ring of the constant velocity joint. FIG. 3 is a perspective view showing the cage. FIG. 4 is a longitudinal front view showing a conventional constant velocity joint. FIG. 5 (I) is a longitudinal front view showing a state in which the cage is being assembled. Fig. 6 is a side view. Fig. 6 is a side view showing a part of the outer ring and the cage.
20 outer ring 22 spherical 23 track groove 24 edge 24a inner end 30 inner ring 31 spherical outer surface 32 track groove 40 ball 50 cage 53 pocket 54 groove

Claims (1)

The center of the spherical inner surface of the outer ring and the center of the spherical outer surface of the inner ring are the same center, and a ball is placed between the curved track groove formed on the spherical inner surface of the outer ring and the curved track groove provided on the spherical outer surface of the inner ring. A cage having a pocket for accommodating the ball is provided with a spherical outer surface in surface contact with the spherical inner surface of the outer ring and a spherical inner surface in surface contact with the spherical outer surface of the inner ring, and the curvature of the track groove in the axial section of the outer ring. In a constant velocity joint in which the center of curvature of the track groove in the axial section of the center and the inner ring is offset by equal distance from side to side with respect to the angular center of the constant velocity joint, two grooves extending in the circumferential direction are formed on the spherical outer surface of the cage. provided symmetrically with respect to the width center line of the cage, substantially equal to the that the dimension between the inlet at the edge of the opposite inner end of the outer ring side track groove adjacent the groove spacing of the two rows Constant velocity joint, characterized.

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