JPH0671208U - Double row oblique contact bearing for wheel support - Google Patents

Abstract

(57) [Summary] [Purpose] To make the structure easy to assemble but difficult to move in the axial direction after the assembly. [Structure] Outer ring 1 in double row outward angular contact ball bearing
A band-shaped recess 8 is formed at several circumferential positions in the axially intermediate portion of the outer peripheral surface of the
Are provided at equal intervals around the circumference. Thereby, when the bearing is assembled between the wheel hub 5 and the knuckle 6,
The recess is less likely to be caught in the knuckle 6, and when an axial load is applied after the assembling, a part of the knuckle 6 bites strongly into the recess 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a double-row oblique contact bearing for supporting a wheel, which is press-fitted into an axle housing of an automobile or the like with a predetermined interference.

[0002]

[Prior art]

 As a conventional double-row oblique contact bearing of this type, for example, there is a so-called double-row outward angular ball bearing as shown in FIG. 5, which includes a single outer ring 50 having two rows of ball raceways and Two inner rings 51, 51 having one row of ball tracks, a plurality of balls 52, ..., Two cages (not shown) for holding each group of two rows of balls 52, and both ends of the outer ring 50. And seals 53, 53 provided between the respective shoulders and one end of the inner rings 51, 51. A counterbore is provided at the inner circumference of both ends of the outer ring 50 and the outer circumference of each one end (inner end) of the two inner rings 51, 51, and a preload is applied to the side facing each other through the inner rings 51, 51. By adding them, the ball 52 has an oblique contact structure in which the balls 52 come into contact with each race ring at a contact angle.

The double row oblique contact bearing shown in the figure is interposed between the wheel hub 54 and the knuckle 55, and the outer ring 50 and the knuckle 55 are set to have a tight fit so as to have a negative interference. At the same time, it is retained by a retaining ring 56.

[0004]

[Problems to be solved by the device]

 By the way, with bearings for wheel support, when the bearing outer ring 50 is set to have a tight fit with the knuckle 55 when the vehicle receives an excessive axial load, such as when the vehicle is turning, there is play in the mounting groove of the retaining ring 56. The entire bearing may be slid in the axial direction for a minute, and in extreme cases, the impact sound to the snap ring 56 is emitted.

On the other hand, although not shown, a circumferential groove that is continuous in the circumferential direction is provided at each end of the outer circumferential surface of the bearing outer ring 50, and when assembled, the knuckle 55 is made of a softer metal than the outer ring 50. It is conceivable that a part of the groove is made to bite into the circumferential groove of the outer ring 50. However, in this case, since the circumferential groove is orthogonal to the axial direction (bearing assembling direction), when the bearing is assembled in the knuckle 55, the circumferential groove of the bearing outer ring 50 covers the entire circumference of the inner circumferential surface of the knuckle 55. Since it is caught, it is necessary to press with an excessively large force, and the inner peripheral surface of the knuckle 55 is damaged.

In view of such circumstances, it is an object of the present invention to provide a structure that facilitates the assembling but does not easily displace in the axial direction after the assembling.

[0007]

[Means for Solving the Problems]

 According to the present invention, in a double-row oblique contact bearing for supporting a wheel, which is press-fitted into an axle housing with a predetermined interference, there are counter bores at both axial ends and two rows of rolling element groups in the middle of the axial direction. At least one circumferentially discontinuous recess is provided in the axial center of the mating surface of the race having the raceway groove.

[0008]

[Action]

 Since the recess provided in the bearing ring is discontinuous in the circumferential direction and is at least at one location on the circumference, even if the recess is caught by the mating partner when the bearing is installed, it can be assembled relatively easily. Become.

When an axial load is applied in the assembled state, the load is concentrated on the axial center point of the outer ring, so that a part of the mating hand strongly digs into the recess provided at this load concentration point. Therefore, it becomes difficult to slide in the axial direction.

[0010]

【Example】

 1 and 2 show one embodiment of the present invention. The double-row oblique contact bearing shown in the figure is basically the same double-row outward angular ball bearing as that of the conventional example. It has a single outer ring 1 having two rows of ball tracks and one row of ball raceways. Two inner rings 2 and 2, a plurality of balls 3, two cages (not shown) for holding two groups of balls 3 in each row, and shoulders at both ends of the outer ring 1 and the inner ring 2, 2 and the seals 4 and 4 provided between the two ends. In the figure, 5 is a wheel hub, 6 is a knuckle, and 7 is a retaining ring.

The feature of the present embodiment is that the outer ring 1 is provided with recesses 8 at equal intervals at several circumferential positions (eight positions) in the axial direction where the axial load is concentrated. Each of the recesses 8 has a strip shape, and the ridge lines of the four sides of the opening are inclined with respect to the line O along the axial direction. The recess 8 can be formed by rolling, and the depth is set to about 0.2 mm and the inclination angles θ _{1 to} θ ₄ are set to 0 degrees <θ <90 degrees. It is preferable that the inclination angle between the center line along the longitudinal direction of the recess 8 and the line O along the axial direction is set to 30 to 60 degrees.

As described above, when the recesses 8 are provided in spots at several places on the circumference and the ridge lines of the four sides of the opening of the recesses 8 are inclined with respect to the line O along the axial direction, the knuckle 6 has the bearing outer ring 1 Although part of the knuckle 6 fits into the recess 8 when assembling, the part that fits in as the press-fitting progresses smoothly from the ridge line on the rear end side of the recess 8 toward the rear side. A part of the knuckle 6 does not get caught in the recess 8 like the circumferential groove, so that the bearing can be easily assembled.

However, once assembled, the outer ring 1 is provided with the recess 8 at the load concentration point when an axial load is applied. Therefore, when an axial load is applied, a part of the knuckle 6 is strongly pressed into the recess 8. You will cut into it. As a result, the fixing force of the bearing with respect to the knuckle 6 is increased, which makes it difficult for the entire bearing to slide in the axial direction.

The present invention is not limited to the above embodiment. That is, various other shapes such as those shown in FIGS. 3 and 4 can be considered for the shape of the recess 8. Further, the present invention can be applied to various types of double-row oblique contact bearings such as double-row tapered roller bearings.

[0015]

[Effect of device]

 As described above, according to the present invention, a part of the mating partner is less likely to be caught when the bearing is installed in the usage place, and a part of the mating partner is stronger when the axial load is applied in the assembled state. Since it is devised to bite into it, it can be easily assembled without requiring too much force, and it can be prevented from sliding easily in the axial direction when the axial load is applied after installation.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the upper half of an embodiment of a double row oblique contact bearing for supporting a wheel according to the present invention.

FIG. 2 is a perspective view of an outer ring of the bearing.

FIG. 3 is a perspective view showing another example of a recess.

FIG. 4 is a perspective view showing still another example of a recess.

FIG. 5 is a vertical cross-sectional view of the upper half of an example of a conventional double-row oblique contact bearing for supporting a wheel.

[Explanation of symbols]

 1 outer ring 2 inner ring 3 ball 5 wheel hub 6 knuckle 8 recess

Claims (1)

[Scope of utility model registration request] 1. A double-row oblique contact bearing for supporting a wheel, which is press-fitted into an axle housing with a predetermined interference, and has counterbore at both axial ends and two rows of axially intermediate rolling bearings. A double-row oblique contact bearing for wheel support, wherein at least one circumferentially discontinuous recessed portion is provided at an axial center of a fitting surface of a bearing ring having a raceway groove of a moving body group.