JPH07137826A - Resin-made bearing - Google Patents

Abstract

PURPOSE:To facilitate assembling work by omitting the application of adhesives and so forth at the time of assembling this resin-made bearing into a tubular member such as a roller. CONSTITUTION:This resin-made bearing 1 is provided with an outer race part 2 which is fitted inside the end part of a roller R, an inner race part 3 disposed through multiple steel balls 5 inside the outer race part, and a cover member 6 fitted onto the outer end surface of the outer race part 2. Three adhesive injection parts 2e are formed at equal angular intervals in the outer race part 2 to make its outer end surface serve as an inlet, and are open to the inner periphery surface of the roller R. At the time of assembling into the roller R, the outer race part 2 is first fitted inside the end part of the roller R with the cover member 6 not fitted, and an adhesive is then injected in the three adhesive injection parts 2e. The cover member 6 is fitted onto the outer end surface of the outer race part 2 so that respective protrusions 6a of the cover member 6 may be fitted into the inlets of the respective adhesive injection parts 2e.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin bearing mainly used for resin roller conveyors and the like.

[0002]

2. Description of the Related Art Conventionally, there is known a roller conveyor as shown in FIG. 15 in which at least a large number of rollers 100 are made of resin. The roller 100 has bearings (radial bearings) on the left and right frames 101.
The roller 10 is rotatably supported by a resin roller 10
Corresponding to 0, some bearings are made of resin.

In this case, as shown in FIG. 16, the outer ring portion 1
02 and resin bearing 10 including inner ring portion 103
4 is fitted and fixed inside the end of the roller 100. Conventionally, before the bearing 104 is fitted to the roller 100, an adhesive is applied to the outer peripheral surface of the outer ring portion 102, and then the bearing 104 is fitted to the inside of the end of the roller 100. Therefore, the roller 100 and the outer ring portion 102 of the bearing 104 are integrated.

[0004]

However, when the resin bearing 104 is fitted to the roller 100, the adhesive is extruded from the joint surface and the roller 100 and the outer ring portion 1 are pressed.
02 or the adhesive is applied to the outer ring portion 102.
And the bearing 10 between the inner ring portion 103 and the bearing 10
There is a problem that the free rotation of 4 is hindered. Also,
Since the adhesive has to be applied to the outer peripheral surface of the bearing outer ring portion 102 one by one, the workability of assembly is not good.

An object of the present invention is to provide a resin bearing in which the adhesive does not adhere to the periphery and the assembling work via the adhesive is easy.

[0006]

SUMMARY OF THE INVENTION The present invention is premised on a resin outer ring portion fitted inside the end portion of a tubular member and a resin inner ring portion arranged inside the outer ring portion. ,
The gist is that an adhesive injection portion is formed on the outer ring portion. The adhesive injection portion has an inlet formed on the outer end surface of the outer ring portion and opens on the outer peripheral surface of the outer ring portion which is involved in the fitting.

Further, in the invention in which the cover member is further added, the resin cover member is attached to the outer end surface of the outer ring portion. This cover member is provided with a protrusion that closes the inlet of the adhesive injection portion.

Further, when the cover member is mounted so as to cover the bearing portion between the outer ring portion and the inner ring portion from the outside, a water drain hole penetrating the cover member and opening to the bearing portion may be formed. it can.

[0009]

The resin bearing according to the present invention is fitted inside the end portion of a cylindrical member such as a roller, and after the fitting is completed, the adhesive is injected from the inlet of the adhesive injection portion formed in the outer ring portion. To be done. The injected adhesive reaches the outer peripheral surface of the outer ring portion that is involved in the fitting, and bonds the outer ring portion and the tubular member.

In the invention in which the cover member is added, after the adhesive is injected as described above, the protrusion of the cover member is fitted into the inlet of the adhesive injection portion by mounting the cover member to close the adhesive injection portion. As a result, even if the adhesive after injection is in a fluid state, it is prevented from leaking outside from the adhesive injection part.

In the invention in which the cover member is provided with the water drainage hole, even if water enters a cylindrical member such as a roller, the water can be released to the outside.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an assembly of a resin bearing (hereinafter, simply referred to as a bearing) 1. The bearing 1 includes a cylindrical outer ring portion 2, a cylindrical inner ring portion 3 coaxially arranged inside the outer ring portion 2, and a large number of steels retained by a retainer 4 between the outer ring portion 2 and the inner ring portion 3. Sphere 5
And a cover member 6 attached to the outer end surface of the outer ring portion 2. Outer ring part 2, inner ring part 3 and cover member 6
Is made of, for example, polyamide resin or other appropriate resin.

The outer ring portion 2 is fitted inside the end portion of a roller R made of resin, for example, and a circular flange 2a is formed at one end in the axial direction, and the shoulder surface 2b of the flange 2a is formed.
By hitting the end surface of the roller R, the fitting amount of the outer ring portion 2 is defined.

As is apparent from FIGS. 3 and 4, a shallow recess 2c is formed on the end face (outer end face) of the outer ring portion 2 on the flange 2a side.
Is formed, and the inlet 2d of the adhesive injection portion 2e is formed as a circular small hole at the outermost peripheral portion of the bottom surface of the recess 2c. The adhesive injection part 2e extends from the entrance 2d to the inner part in parallel with the center line of the outer ring part 2, but does not penetrate to the inner end face and has a dead end form. Further, the adhesive injection portion 2e has a hole shape in the region of the flange portion 2a of the outer ring portion 2, but has a groove-like shape in the inner portion deviated from it, and opens in the outer peripheral surface of the outer ring portion 2. ing.

As shown in FIG. 4, such an adhesive injection portion 2e is formed at three positions at equal angular intervals with respect to the center of the outer ring portion 2, and the inlets 2d of these three adhesive injection portions 2e are formed. Corresponding to the above, shallow arc-shaped concave portions 2f are formed at three locations on the inner peripheral surface of the flange 2a of the outer ring portion 2, and further an annular ring groove 2g is formed on the inner peripheral surface of the flange 2a. Has been done. The annular groove 2g and the recess 2f are for mounting the cover member 6 shown in FIG. 7, and this point will be described in detail later. Further, an outer race 2h for the steel balls 5 is formed on the inner peripheral surface of the outer ring portion 2 of FIG.

As shown in FIGS. 5 and 6, an inner race 3a of a steel ball 5 is formed on the outer peripheral surface of the inner ring portion 3, and an outer peripheral surface on the outer side (right side in FIG. 5) of the inner race 3a is radially outer. An annular labyrinth protrusion 3b protruding in a direction is formed. As is apparent from FIG. 1, the inner ring portion 3 has an inner end surface that is pulled down to a certain size outside from that of the outer ring portion 2, but an outer end surface that protrudes outward from the outer ring portion 2 by a certain amount. The protrusion 3b is located substantially in a plane including the end surface of the flange 2a of the outer ring portion 2, and is located on the lateral extension of the steel ball 5 as a bearing portion.

As shown in FIGS. 7 and 8, the cover member 6 has an annular cap shape, and a pin-shaped projection 6a projecting inward is formed on the outer peripheral portion of the inner surface of the cover member 6. Three pieces are formed at equal angular intervals with respect to the center. The protrusions 6a have such a size that they are just fitted into the entrance 2d of the adhesive injection portion 2e of the outer ring portion 2 shown in FIGS. In addition, convex portions 6b bulging in an arc shape are formed at three convenient locations on the base end portions of these projections 6a, and these convex portions 6b fit into the concave portions 2i of the outer ring portion 2 shown in FIG. Becomes Further, an annular low annular projection 6c is formed on the outer peripheral portion of the cover member 6, and the annular projection 6c is fitted in the annular groove 2g of the outer ring portion 2 shown in FIG. A flange 6g is formed on the outermost peripheral portion of the cover member 6, and the end face thereof abuts the end face of the flange 2a of the outer ring portion 2 as shown in FIG. 1, and the flange 6g of the cover member 6 and the flange 2a of the outer ring portion 2 are formed. And have the same diameter.

Returning to FIG. 7, the cover member 6 has a center hole 6
d is formed, and the central hole 6d is formed slightly larger than the outer end diameter of the inner ring portion 3 as shown in FIG.
The outer end portion of the inner ring portion 3 is adapted to enter the center hole 6d thereof and to project slightly outward therefrom. Inner ring 3
The labyrinth protrusion 3b is located between the cover member 6 and the steel ball 5. In addition, 6e in FIG.
Is a reinforcing rib formed in an annular shape inside each of the protrusions 6a described above.

Further, as shown in FIG. 8, three drain holes 6f are formed in the cover member 6 around the center hole 6d so as to penetrate the cover member 6 in the thickness direction. These drainage holes 6f are opened so as to face the side of the steel ball 5 as a bearing portion as shown in FIG.

Next, a method of assembling the resin bearing 1 as described above to the resin roller R will be described.

First, as shown in FIG. 9, the bearing 1 on which the cover member 6 is not mounted is fitted inside the end portion of the roller R, and as shown in FIG. 10, the flange 2a of the outer ring portion 2 is attached to the end surface of the roller R. Push it in until it hits. Next, as shown in FIG. 11, the adhesive is simultaneously injected from the inlets 2d of the outer ring portion 2 into the adhesive injection portions 2e at three locations by a predetermined adhesive injection device 8. After that, the adhesive injection device 8 is removed, and instead, the cover member 6 is attached to the outer end surface of the outer ring portion 2 as shown in FIG. That is, as shown in FIG. 13, the three protrusions 6 a of the cover member 6 are attached to the adhesive injection portion 2.
It is fitted in each inlet 2d of e to block each injection portion 2e to prevent the injected adhesive from leaking out. In addition, FIG.
The annular projection 6c of the cover member 6 of the
g of the cover member 6 and the protrusion 6b of the base end of each protrusion 6a of the cover member 6 fits into the recess 2i of the outer ring portion 2,
The cover member 6 is fixed to the outer ring portion 2. The adhesive injected into the adhesive injecting portion 2e adheres to the inner peripheral surface of the roller R or diffuses along the inner peripheral surface, and the curing of the adhesive fixes the roller R and the outer ring portion 2, and thus The assembly of the bearing 1 is completed.

Note that the cover member 6 not only plays a role of confining the adhesive agent, but also acts as a dustproof effect on the steel ball 5 which is the bearing portion. However, even if water enters the inside of the roller R, the water of the cover member 6 is prevented. The water can be released to the outside through the drain hole 6f. Further, the labyrinth protrusion 3b formed on the inner ring portion 3 prevents or suppresses water from entering through a minute gap between the center hole 6d of the cover member 6 and the inner ring portion 3.

In the embodiment described above, the fitting amount of the bearing 1 with respect to the roller R is determined by the flange 2 of the outer ring portion 2.
Although it is defined by a, it may be configured so as to be defined by the stepped surface 10 formed on the inner peripheral surface of the roller R, as shown in FIG. Alternatively, the adhesive injection portion 12e may be entirely formed in a groove shape. In the resin bearing 11 of this embodiment, the outer ring portion 12 and the inner ring portion 13 have a sliding bearing structure.

[0024]

According to the present invention, the outer ring portion is injected by injecting a predetermined adhesive from the outer end surface of the outer ring portion into the adhesive injecting portion with the bearing fitted inside the end portion of the tubular member. The cylindrical member and the tubular member can be integrated, and the troublesome work of applying the adhesive to the outer peripheral surface of the outer ring portion is not necessary. Also,
There is no problem that the adhesive adheres to the periphery or enters the bearing portion to hinder the rotation.

In the invention in which the cover member is added,
After the adhesive is injected, the entrance of the adhesive injection part is blocked by the projection of the cover member, and the adhesive is trapped in the adhesive injection part, preventing the adhesive immediately after injection from leaking from the entrance. To be done. In addition, since the entrance of the adhesive injection portion is covered, the appearance is improved.

Further, in the invention in which the water drainage hole is formed in the cover member, even if water enters the inside of the cylindrical member such as the roller, it can be discharged to the outside through the water drainage hole of the cover member.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a resin bearing according to an embodiment of the present invention (A-A cross-sectional view in FIG. 2).

FIG. 2 is a front view thereof.

FIG. 3 is a sectional view of an outer ring portion.

FIG. 4 is a front view thereof.

FIG. 5 is a half sectional view of an inner ring portion.

FIG. 6 is a front view thereof.

FIG. 7 is a half sectional view of a cover member.

FIG. 8 is a front view thereof.

FIG. 9 is an explanatory view of a method of fixing the bearing and the roller.

FIG. 10 is a cross-sectional view of a completed fitting state.

FIG. 11 is an explanatory diagram of an adhesive injection step.

FIG. 12 is an explanatory view of a state where the cover member is mounted after the adhesive is injected.

FIG. 13 is a cross-sectional view of the state in which the mounting is completed.

FIG. 14 is a schematic cross-sectional view of another embodiment.

FIG. 15 is a perspective view showing an example of a resin roller bearing.

FIG. 16 is a perspective view showing a conventional method of fixing a resin bearing to a roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin bearing 2 Outer ring part 2e Adhesive injection part 2d Inlet 3 Inner ring part 5 Steel ball 6 Cover member 6a Protrusion 6d Center hole 6f Drain hole

Claims (3)

[Claims] 1. An outer ring part made of resin fitted inside the end part of a tubular member, an inner ring part made of resin arranged inside the outer ring part, and an inlet formed in an outer end surface of the outer ring part. And a resin injection bearing opening to the outer peripheral surface of the outer ring portion that is provided for the fitting. 2. An outer ring part made of resin fitted inside the end part of the tubular member, an inner ring part made of resin arranged inside the outer ring part, and an inlet formed on the outer end face of the outer ring part. And a resin cover attached to the end surface of the outer ring part, which includes an adhesive injection part that is open to the outer peripheral surface of the outer ring part that is provided for the fitting and a protrusion that closes the inlet of the adhesive injection part. A resin bearing, which includes a member and. 3. The cover member is mounted so as to cover the bearing portion between the outer ring portion and the inner ring portion from the outside, and the cover member is formed with a water drain hole penetrating itself and opening to the bearing portion. The resin bearing according to claim 2.