JPS6196217A - Device for fixing inner race of bearing to shaft - Google Patents

Abstract

PURPOSE:To prevent occurrence of slackness by disposing an annular recess groove on the outer peripheral surface of a shaft, fitting a taper split ring therein, and fitting an outer peripheral ring for retaining the reduced diameter condition on the outside of the ring. CONSTITUTION:A bearing fixing device 5 comprises an annular recess groove 6, a taper split ring 7 fitted in the recess groove 6 and an outer peripheral ring 8 for retaining the reduced diameter condition, which is fitted to the outside of the taper split ring 7. An inner race is axially pressed by wedge action of the taper surface, and the reduced diameter condition of the split ring can be retained by the outer peripheral ring. Thus, the inner race is pressed and fixed by strong force, the occurrence of slackness can be prevented, and the structure is simple and reduced to a compact size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fixing device for fixing an inner ring of a bearing attached to a shaft or the like in the axial direction.

[Prior Art] For example, in wheel bearings for automobiles, there has been a shift from using a single bearing to using a unit bearing.

When a unit bearing is used, a fixing device is required to fix the circular ring to the shaft or hub in the axial direction, and this fixing device is required to have the following characteristics.

tn It is necessary to suppress the movement of the inner ring in the thrust direction and to press the inner ring with strong force so that it does not rub even under heavy load. Particularly in the case of a type in which the circular rings are divided into two rows, a large pressing force is required because the radial load acts as a force that separates the inner rings from each other.

(IT) The space for the foil bearing part is narrow, so it is essential to make the structure more compact, especially in the case of a knob joint.

(I[) Must be reliable in preventing loosening even when vibration or load is applied.

(TV) The structure is simple, the cost is low, and mass production is possible.

[Problem that the invention seeks to solve]

By the way, the most common conventional means of fixing the inner ring of a bearing to the shaft or hub is to use a nut, but the structure and processing are complicated and assembly is time-consuming, and it does not meet any of the above-mentioned characteristics requirements. The problem is that it cannot be satisfied.

This invention was made to solve the above-mentioned problems, and it can obtain a large pressing force against the inner ring, has a simple structure, does not cause loosening, and has the characteristics required for fixing the inner ring. It is an object of the present invention to provide a device for fixing an inner ring of a bearing to a shaft, etc., which can satisfy all of the following.

[Means for solving problems]

In order to solve the problems mentioned above, the present invention provides an annular groove on the outer circumferential surface of a shaft, etc. into which a bearing is inserted, at a position opposite to the direction in which the bearing is pressed. A tapered split ring that presses the inner ring by the wedge action of the tapered surface when the diameter is reduced is fitted, and an outer peripheral ring that maintains the reduced diameter state is fitted on the outside of this split ring.

[For production]

Place the bearing against the shaft or hub to the point where its inner ring touches the shoulder.
When the tapered split ring is inserted into the concave groove and the tapered split ring is tightened from the outer periphery to reduce its diameter, the wedge action of the tapered surface presses the inner ring in the axial direction, causing the tapered split ring to contract. The inner ring is fixed so that it does not move in the axial direction by maintaining the radial state with the outer circumferential ring fitted onto the outside.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figure 1 shows an example in which the knob unit is used in a constant velocity joint for automobile wheels.A unit bearing 2 is inserted outside the hub 1, one side of the inner ring 3 is supported by a shoulder 4, and the hub Place the inner ring 3 on the shoulder 4 at a position opposite to the pressing direction of the inner ring 3 on the outer peripheral surface exposed from the unit bearing 2 of 1.
A fixing device 5 is provided for pressing and fixing.

The fixing device 5 includes an annular groove 6 provided on the outer circumferential surface of the hub 1, a tapered split ring 7 fitted into the groove 6, and a tapered split ring 7 fitted onto the outside of the tapered split ring 7. The concave groove 6 is formed to reach inside the other side surface of the inner ring 3.

The tapered split ring 7 has tapered surfaces 7a on both sides.
When the diameter of the inner ring 3 is reduced by applying pressure from the outer periphery in the groove 6, the inner ring 3 is pressed in the axial direction by the wedge action of the tapered surface 7a and fixed with the shoulder 4.

This tapered split ring 7 may be divided into a plurality of parts as shown in FIG. 7, or a part of its periphery as shown in FIG. is separated.

Further, in order to improve the bendability, a part of the inner periphery as shown in FIG. 9 or as shown in FIG. 10 (notches 71 at several places on the inner periphery) may be provided.

The formation of the tapered surface 7a of the taper split ring 7, the number of incorporation into the groove 6 circles, and the combination thereof can be freely selected, and the outer circumferential ring 8 that maintains the reduced diameter state of the taper split ring 7 can also have a different structure. Figures 2 to 6 show some examples of these.

In the first example shown in FIG. 2, two split rings 7.7 each having a tapered surface 7a on the negative side are fitted into the groove 6, and one of the split rings 7. By increasing the diameter, the inner ring 3 is pushed in the axial direction via the other split ring 7, and a part of the outer ring 8 fitted onto the one split ring 7 is caulked 8a.
The diameter is maintained in a reduced diameter state.

The second example shown in FIG. 3 has a different outer ring 8 from the first example, and the hub 1 and the outer ring 8 are connected by screws
With the taper 10 provided on the inner circumference of the outer ring 8 and the outer circumference of the -blade side ring 7, when the outer ring 8 is screwed in, the diameter of the one-blade side ring 7 is reduced.

In the third example shown in FIG. 4, the screw is omitted from the second example, and the outer circumferential ring 8 is press-fitted in the axial direction, thereby reducing the diameter of the 10,000-split ring 7 with the taper 10 and holding it. .

The fourth example shown in FIG. 5 has three tapered split rings 7.7
．． 7 is used, both sides of the center split ring 7 are tapered 7a, and the inner ring 3 is pressed by reducing the diameter of this split ring 7 and press-fitting it into the 7 holes with the both side split rings 7. It is.

A fifth example shown in FIG. 6 is a case where − number of split rings 7 are used, and a taper 6a that matches the taper 7a of the split ring 7 is provided on the side surface of the groove 6, and the taper 6a shown in FIG. The diameter of the split ring 7 is reduced by the outer circumferential ring 8 having the same structure as in the second example.

Although the bearing unit 2 fitted into the hub 1 is a ball unit bearing in the illustrated case, it may also be a tapered unit bearing or a type in which the inner ring is divided into two rows.

The fixing device of the present invention has the above-mentioned configuration, and has a hub 1.
Insert the bearing unit 2 so that the inner ring 3 is in contact with the shoulder 4, then fit the split ring 7 into the groove 6, and tighten the split ring 7 from the outer periphery to reduce the diameter. When the inner ring 3 is pressed in the axial direction by the wedge action of the groove 7a using the side surface of the concave groove 6 as a support surface, and the reduced diameter state of the split ring 7 is maintained by fitting the outer circumferential ring 8, the inner ring 3 meets the shoulder 4. It is clamped and fixed by the tapered split ring 7, and is completely restrained in the axial direction.

〔effect〕

As described above, according to the present invention, the diameter of the tapered split ring inserted into the groove is reduced, and the inner ring is pushed in the axial direction by the wedge action of the taper (2. The reduced diameter state of the split ring is controlled by the outer ring). Since the inner ring is held in place, the inner ring can be pressed and fixed with firm force, and there is no possibility of loosening. It can meet all the requirements for specific characteristics.

In addition, it can be easily disassembled by removing the outer ring, and if the bearing or joint part is damaged, it can be reassembled and used by simply replacing the damaged part.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of the use of the fixing device according to the present invention, FIGS. 2 to 6 are enlarged sectional views showing different combinations of the tapered split ring and the outer ring, and FIGS. Each of FIG. 10 is a front view showing a different example of the tapered split ring. 1 is a hub, 2 is a unit bearing, 3 is an inner ring, 4 is a shoulder, 5 is a fixing device, 6 is a groove, 7 is a tapered split ring, and 8 is an outer ring. Same Agent Kama 1) Bun 2 No. 7
Illustration 8 countries b

Claims (5)

[Claims] (1) An annular groove is provided on the outer circumferential surface of the shaft, etc. into which the bearing is fitted, at a position opposite to the direction in which the bearing is pressed, and the inner ring is pressed by the wedge action of the tapered surface in this groove when the diameter is reduced. A fixing device for fixing an inner ring of a bearing to a shaft, etc., in which a split ring is fitted, and an outer peripheral ring that maintains a reduced diameter state is fitted on the outside of the tapered split ring. (2) A plurality of sets of tapered split rings are fitted into a concave groove with their tapered surfaces superimposed on each other.
A device for fixing the inner ring of a bearing to a shaft, etc., as described in 2. (3) The device for fixing an inner ring of a bearing to a shaft or the like according to claim 1, wherein the outer circumferential ring has a circumferential surface tapered to reduce the diameter of the tapered split ring. (4) The device for fixing the inner ring of the bearing to the shaft or the like according to claim 1, wherein the tapered split ring has a diameter reducing property by cutting off a part of the outer periphery. (5) The device for fixing an inner ring of a bearing to a shaft or the like according to claim 1, wherein the tapered split ring is configured by being divided into a plurality of parts.