JPS5833300Y2 - Plastic cage for roller bearings - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a comb-shaped plastic cage used in a roller bearing that uses cylindrical rollers, tapered rollers, needle rollers, spherical rollers, etc. and has a guide collar on the bearing ring.

In conventionally known cages of this type, projections are provided on the circumferential surface of the pillars that hold the rollers, for example, as a means to guide the cage in the axial direction and prevent it from falling off. to engage the guide collar of the bearing ring, and further,
It is widely known that in order to facilitate assembly of the retainer into the bearing, the protrusion is formed into a tongue-like shape that is easily deformable.

but. In this known example, since the axial rigidity of the protrusion is small, the axial guidance of the retainer is unstable, and the tongue pieces are torn off during use. After that, there were problems such as it being extremely difficult to remove.

The purpose of this invention is to eliminate the drawbacks and problems of the conventional cage described above.

Next, the cage of this invention will be explained with reference to each embodiment including the bearing structure shown in FIGS. 1 to 7. 1 is an outer ring of a cylindrical roller bearing having an inward guide collar 11 on the outer ring; 2 is its inner ring, 3 is a cylindrical roller, and 4 is a plastic cage of the present invention.

First, the first embodiment shown in FIGS. 1 to 3 will be described. The cage 4 has pillars 41, 41, which hold rollers arranged at equal intervals on the circumference, and one end of which is It has a comb shape connected by an annular body 42, and has protrusions 43 in the same direction on the outer circumferential surface of the pillar 41 that overlap and engage with the inward guide collar 11 of the outer ring 1 in the radial direction.

The projection 43 has a radial dimension that gradually increases toward the annular body 42, and one end in the circumferential direction is connected to the pillar 41, and the other end is in the shape of a free tongue. ing.

That is, only two directions, one on the annular body 42 side and one in the circumferential direction, are open, and the other side (the remaining part that is not open) is connected to the circumferential surface of the column 41 itself, and is radially opened from the circumferential surface of the steel column. It has a tongue-like shape that protrudes from the top.

FIG. 4 shows a second part of a cage in which two tongue-like protrusions 43 in the embodiment shown in FIGS. 1 to 3 are provided on one pillar 41 with their free ends (opening sides) facing each other. This figure shows an example of this.

FIG. 5 shows the tongue-shaped protrusion 43 in the embodiment shown in FIGS. 1 to 3 on the side connected to the column 41 (non-free end side).
This figure shows a third embodiment of a cage in which two cages are provided on one pillar 41 by integrating the cages and extending their free end sides (opening sides) in opposite directions.

Fig. 6 shows the cage shown in the first embodiment of Figs. This is an example of use in which a pair of cages are placed facing each other and incorporated into one bearing.

FIG. 7 shows the retainer shown in the example of use in FIG.
and a recess 45 corresponding to the projection 44 at the other free end.
This is an example of use in which the convex portion 44 and the concave portion 45 face each other so as to engage with each other inside the bearing to form a pair of retainers, and are assembled into one bearing.

As described above, in the cage of this invention, the guide collar 11 of the bearing ring provided on the circumferential surface of the pillar 41 that holds the rollers
The protrusion 43 that engages with is opened in two directions, one on the annular body 42 side and one in the circumferential direction, and the remaining unopened portion is connected to the circumferential surface of the column and protrudes in the radial direction from the circular surface of the steel column. Therefore, the protrusion 43 is connected to the column 41 over a certain length in the axial direction, so although it is easily deformed in the radial direction, it has high rigidity in the axial direction, making it easy to incorporate the retainer into the bearing. The advantage is that the retainer is easily guided in the axial direction during rotation, and since the length of the protrusion 43 connected to the column 41 itself is long, the tongue piece does not break off during use. There is.

In particular, in the first embodiment, when the cage is removed for inspection or repair of the bearing, a pulling force is applied to the cage and the tongue piece 43 is turned in the direction of the side connected to the pillar 41 (in the direction opposite to the free end). For example, the tongue piece 43 is pressed against the circumferential surface of the column 41 by the guide collar 11 of the raceway, and the retainer can be easily pulled out from the raceway, which is convenient.

This is remarkable in a structure in which it is impossible to insert any kind of removal tool from the annular body side of the retainer, as in the usage examples of FIGS. 6 and 7.

In each of the above embodiments, the outer ring has an inward guide collar and the retainer has a protrusion on the outer peripheral surface of the column, but in a bearing with an inner ring with an outward guide collar, the protrusion is on the inner side of the column. A similar effect can be obtained by using a cage on the circumference.

Furthermore, if the retainer has projections on the outer circumferential surface and the inner circumferential surface of the column, the same retainer can be used in both a bearing having a guide collar on the outer ring and a bearing having a guide collar on the inner race.

Further, the protrusions do not need to be provided on all columns, but may be provided on appropriate columns depending on the type of bearing, usage conditions, etc.

It should be noted that, as a matter of course, the structure and shape of the guide collar, the shape of the pillars and the annular body, etc. are not limited to the examples.
It is intended to be implemented with appropriate modifications within the scope of the claims.

Further, although this embodiment has been described with respect to a cylindrical roller bearing, the same applies to other types of roller bearings having a guide collar on the bearing ring.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a cylindrical roller bearing incorporating an embodiment of the cage of this invention, Fig. 2 is a perspective view of the cage shown in Fig. 1, and Fig. 3 is A of Fig. 1. - A cross-sectional view of the column along line A,
4 and 5 are views corresponding to FIG. 3 showing other embodiments,
6 and 7 are views corresponding to FIG. 1, showing an example of the use of a pair of cages. In the examples, 1 is an outer ring, 2 is an inner ring, and 3 is a cylindrical roller. 4 is a retainer, 41 is a column, 42 is an annular body, 43 is a projection, 4
4 is a convex portion, and 45 is a concave portion.

Claims (4)

[Scope of utility model registration request] (1) Pillars 41, 41... arranged at equal intervals on the circumference
. . . has a pair of comb shapes, one end of which is connected by an annular body 42 or two of which are formed separately, facing each other, and is engaged with the guide collar of the bearing ring on the circumferential surface of the pillar 41. In a plastic cage for a roller bearing having a protrusion 43,
The protrusion 43 is. Opening in two directions, one on the annular body 42 side and one in the circumferential direction,
A plastic retainer for a roller bearing, characterized in that the remaining unopened portion is formed in the shape of a tongue that is connected to the circumferential surface of the column 41 and protrudes radially from the circumferential surface of the column 41. (2) A plastic retainer for a roller bearing according to claim 1, which has projections 43 on an appropriate number of surfaces of the pillars 4L41. (3) Columns 41, 41... The roller bearing according to claim 1 of the utility model registration claim, in which the free end sides (annular body sides) are arranged as a pair of cages facing each other so as not to come into contact with each other. plastic retainer. (4) A convex portion 44 is provided at one free end of the opposing columns 41, 41, and a concave portion 45 corresponding to the convex portion 44 is provided at the other free end, and the convex portion 44 and the A plastic cage for a roller bearing according to claim 3, which is adapted to engage with the recessed portion 45.