JPS59491Y2 - Ring body creep prevention device - Google Patents

Description

[Detailed description of the invention] This invention is designed to improve the relationship between the ring body such as the outer ring, inner ring, pulley, or sleeve of a rolling bearing and the mating member such as the housing or shaft that holds the ring body (between the fitting surfaces). The present invention relates to an annular creep prevention device for preventing creep.

Conventionally known creep prevention devices for this type of ring body include those that utilize eccentric grooves (for example, Japanese Patent Publication No. 38-164
04), those using a metal elastic ring (for example, Japanese Patent Publication No. 48-16409), and those using a combination of an eccentric groove and a stop (for example, Japanese Patent Publication No. 50-2020)
No. 9) is known and has been partially implemented, but it has advantages and disadvantages in terms of performance, cost, workability, ease of assembly, etc., and is not necessarily sufficient.This idea has a relatively simple structure. The purpose of the assembly is to obtain a creep prevention device for a ring body that is easy to assemble and handle, and is reliable in preventing creep. an eccentric groove formed eccentrically relative to the eccentric groove; and a specially shaped metal elastic ring having a bulge projecting in the radial direction from the maximum depth of the eccentric groove at least at one location on the circumference; The bulge of the elastic ring is inserted into and engaged with a locking recess formed on the circumferential surface of the mating member facing the eccentric groove of the annular body, and the elastic ring is then inserted into the mating member. The tip of the elastic ring is wedged into the smallest gap of the space remaining between the eccentric groove and the mating member while holding the elastic ring securely against the ring body and completely preventing it from rotating together with the ring body. The structure is such that the

Next, we will explain a typical example shown in the figure in which the device of this invention is applied to a creep prevention device for rolling bearings.
1 is the outer ring of the rolling bearing, 2 is the inner ring, 3 is the ball, 4 is the retainer, 5 is the seal body, 6 is the shaft, 7 is the housing (supporting body for the outer ring), and 8 is a metallic elastic material having spring properties. It's a ring.

The outer ring 1 as an annular body that is fitted and held in the housing 7 has an eccentric groove 12 (a crescent-shaped groove that is not continuous over the entire circumference) 12 that is eccentric with respect to the outer circumferential surface 11 on its outer circumferential surface 11. It is formed.

In particular, the minimum groove depth of the eccentric groove 12 is smaller than the wire diameter (radial length) of the elastic ring 8, which will be described later.

The elastic ring 8 has a wire diameter larger than the groove depth of the minimum depth portion of the eccentric groove 12, and its planar shape is defined by a radius r around the point P1, as shown in FIG. 2, for example. It has circular arc portions 81.82, and between the circular arc portions, there is a bulge portion 83.83 formed by a small circular arc having a radius smaller than the radius r1 of the circular arc portion and having a radius r2 centered on point P2.
It is formed with.

Further, at least one portion of the inner circumferential surface (fitting surface) 71 of the housing facing the eccentric groove 12 of the outer ring has an arbitrary shape into which the bulge 83 of the bullet ring fits and engages. A recess 72 is formed.

For example, as shown in FIG. 3, the elastic ring 8 formed in this way is inserted into the eccentric groove 12 of the outer ring such that the arcuate portion 81 of the elastic ring is located at the position with the largest groove depth.
The housing is mounted in elastic contact with the housing in that state without any special alignment with respect to the housing, i.e. without the need for alignment between the bulge 83 of the elastic ring and the recess 72 of the housing. 7 is assembled.

In this case, the relationship between the eccentric groove 12, the circumferential surface of the housing facing it, and the elastic ring 8 is such that the bulge 83
．． 83 is elastically compressed and deformed, its central portion is pressed against the circumferential surface of the housing, and both side portions of the bulge are pressed against the groove bottom of the eccentric groove. It is assembled in such a way that it is obtained.

In such a state, if creep occurs in the outer ring 1 in the direction of the arrow, for example, the elastic ring 8 rotates together with the outer ring 1, and the bulge 83 of the elastic ring comes to a position facing the recess 72 of the housing. They protrude toward the recess 72 and engage with each other, and as the creep progresses further, the edge on one side of the elastic ring contacts the groove bottom portion of the eccentric groove 12 on the smaller groove depth side and the curved surface of the housing. It bites into a wedge shape toward the smallest gap between them, forming the relationship shown in FIG. 4, forming the creep prevention device of this invention.

Note that due to the installation position of the bearing with the elastic ring relative to the housing, the elasticity of the bulge of the elastic ring, etc., the above-mentioned creep can be prevented by, for example, only the outer ring rotating first, causing the above-mentioned creep between the eccentric groove and the housing. A wedge action occurs to prevent the initial creep, and when a larger leap force is applied, the outer ring's elastic ring rotates together, and when the bulge 83 of the elastic ring reaches the recess position due to this rotation, it moves into the recess. In some cases, the process of protruding toward the other side and engaging with it to prevent subsequent creep may be taken.

Furthermore, if the elastic ring is assembled with the bulge and the recess aligned from the beginning, a wedge effect will occur due to the creep of only the outer ring, resulting in the device of this invention.

FIG. 5 shows another embodiment of the elastic ring 8.
Particularly in this embodiment, one bulge 83 is formed at the center of the circumferential length.

As described above, in the creep prevention device of this invention, at least one bulge is formed on the circumference in the space formed between the eccentric groove of the ring body and the curved surface of the mating member that faces this. The bulge of the elastic ring enters into and engages with the recess of the housing, so that the elastic ring is circumferentially moved relative to the mating member to which the ring body is fitted. Securely held without rotating,
In addition, in this engaged state, one edge of the elastic ring in the circumferential direction is wedged toward the minimum gap of the space, so creep of the ring relative to the mating member can be reliably prevented. .

In other words, since the elastic ring is securely held against the mating member as described above, the elastic ring does not rotate even with a large leap force, and the wedge force increases as the creep force increases. play.

Further, when assembling the annular body having the elastic ring, there is no need for special positioning of the elastic ring and the recess, so the assembling becomes easy, which is extremely advantageous especially when the annular body is assembled in assembly line operations.

Furthermore, as in the embodiment, when the circumferential length of the elastic ring is more than half the circumferential length of the eccentric groove formed over the entire circumference of the outer circumferential surface of the ring body (outer ring), the ring body During handling, the annular body and elastic ring do not separate from each other.
Moreover, the assembly process is a pain.

In addition, although the creep prevention device between the outer ring and the housing of the bearing was explained in the example, creep prevention between the shaft and the inner ring is also implemented, and the object is not particularly limited. The planar shape, cross-sectional shape, shape, size, number, position, etc. of the bulging portion and the recessed portion of the mating member are not limited to the examples, but may be modified as appropriate within the scope of the claims.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of essential parts showing one embodiment of the assembly of the device of this invention, Fig. 2 is a plan view of the elastic ring used in Fig. 1, and Fig. 3 is a line A--A in Fig. 1. A sectional view, FIG. 4 is a longitudinal sectional front view showing the creep prevention device of this invention, and FIG. 5 is a plan view showing another embodiment of the elastic ring. In the symbols of the embodiments, 1 is an outer ring, 12 is an eccentric groove, 2 is an inner ring,
6 is a shaft, 7 is a housing, 72 is a four part, 8 is an elastic ring, and 83 is a bulging part.

Claims (3)

[Scope of utility model registration request] (1) In a creep prevention device for an annular body that is fitted onto a housing or a shaft to prevent creep between mutually fitting surfaces, the circumferential surface of the annular body has an eccentric groove eccentric to the circumferential surface, A metallic elastic ring having a bulge protruding in the radial direction from the maximum depth part of the eccentric groove is attached to the eccentric groove at least at one location on the circumference,
The minimum depth of the eccentric groove is smaller than the radial length of the elastic ring, and the elastic ring has a bulge formed on the circumferential surface of the mating member facing the eccentric groove. The ring body enters into and engages with the recess, and the circumferential edge wedges into the smallest gap of the space formed between the eccentric groove and the circumferential surface of the mating member. Annular creep prevention device designed to prevent creep. (2) Utility Model Registration Claim 1: The annular creep prevention device according to claim 1, wherein the circumferential length of the elastic ring is longer than half the circumferential length of the eccentric groove. (3) Utility Model Registration The creep prevention device for an annular body according to claim 1 or 2, wherein the annular body is an outer ring of a rolling bearing and the mating member is a housing.