JPH07137827A - Resin-made bearing - Google Patents

Abstract

PURPOSE:To make it difficult for dust or the like to invade the bearing part of a rolling bearing or a sliding bearing in a resin-made bearing. 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 which are open to the inner periphery surface of the roller R are formed at equal angular intervals in the outer race part 2. After adhesives is injected, the cover member 6 is fitted onto the outer end surface of the outer race part 2. The cover member 6 is provided with three protrusions 6a which close the inlets of the adhesive injection parts 2e, which are in extreme proximity to the outer periphery of the inner race part 3 in its center hole 6d. the cover member 6 is formed with three water drain holes 6f so as to be open to the side of the steel ball 5. Labyrinth protrusions 3b which protrude in a ring shape are formed at the outer periphery of the inner race part 3.

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 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 the roller 100 is made of resin. Roller 100 is the left and right frame 1
01 is rotatably supported via a bearing (radial bearing), but there is a bearing made of resin corresponding to the resin roller 100.

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 to the inside of the end portion of the roller 100 with an adhesive applied, and the outer ring portion 102 is fixed to the roller 100. In this fixed state, the outer ring portion 102 and the inner ring portion 103 appear as outer end surfaces.

[0004]

However, if the end faces of the outer ring portion and the inner ring portion are exposed in this manner, there is a problem that dust or the like easily enters the rolling bearing portion or the sliding bearing portion when used as a conveyor. . In addition, when the rollers are mounted on a bearing and shipped or traded in the form of an assembly, there is a problem that the appearance is not good and dust or dust easily enters the bearing in the assembled state.

It is an object of the present invention to provide a resin bearing in which dust and dirt are unlikely to enter the bearing portion and which has an improved external appearance.

[0006]

According to the present invention, a resin outer ring portion fitted inside an end portion of a tubular member, a resin inner ring portion arranged inside the outer ring portion, and the outer ring portions thereof. A cover member made of resin provided so as to cover at least the bearing portion between the outer ring portion and the inner ring portion, and the cover member further includes a drain hole so as to open in the bearing portion between the outer ring portion and the inner ring portion. Is formed through itself.

In the invention having further improved waterproofness, the cover member has a central hole, and the inner peripheral surface of the central hole is formed so as to surround the outer peripheral surface along the outer peripheral surface of the inner ring portion. A labyrinth protrusion, which projects annularly from the outer peripheral surface of the inner ring portion, is formed inside the cover member.

[0008]

In the resin bearing according to the present invention, the cover member provided so as to cover at least the bearing portion between the outer ring portion and the inner ring portion prevents or suppresses intrusion of dust or the like into the bearing portion from the outside. The appearance is also improved. Also, due to the water drain hole formed in the cover member,
Even if water enters the inside of a tubular member such as a roller for some reason, the water can be easily discharged from the drain hole of the cover member.

In the invention in which the labyrinth protrusion is formed on the inner ring portion, even if water or the like tries to enter from the outside to the inside through the gap between the outer peripheral surface of the inner ring portion and the cover member center hole, it is formed on the inner ring portion inside the cover member. The labyrinth protrusion is
It plays the role of a shielding plate and prevents its invasion, and acts as a waterproof.

[0010]

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 resin roller R, for example, and a circular flange 2a is formed at one end in the axial direction, and the shoulder surface 2b of this 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 surface (outer end surface) 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 adhesive injection portions 2e are formed at three locations 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 which is located outside the outer ring portion 2 by a certain dimension, but an outer end surface which projects outward from the outer ring portion 2 by a certain amount. The labyrinth protrusion 3b is located substantially on a plane including the end surface of the flange 2a of the outer ring portion 2 and 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 the base end portions of the respective protrusions 6a in FIG. 7, and these three convex portions 6b are formed into the concave portions 2i of the outer ring portion 2 shown in FIG. Will fit into. 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 central 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. As shown in FIG. 1, these drain holes 6f are opened so as to face the side of the steel ball 5, which is the bearing portion.

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

First, as shown in FIG. 9, the bearing 1 without the cover member 6 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 6a of the cover member 6 are fitted into the respective inlets 2d of the adhesive injection portion 2e to close the respective injection portions 2e, so that the injected adhesive is exposed to the outside. Prevent it from leaking. Further, the annular projection 6c of the cover member 6 of FIG. 12 is fitted into the annular groove 2g of the outer ring portion 2, and the projection 6b at the base end of each projection 6a of the cover member 6 is fitted into the recess 2i of the outer ring portion 2. When fitted, 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.

The cover member 6 mounted in this manner covers the steel ball 5 which is the rolling bearing portion between the outer ring portion 2 and the inner ring portion 3 and the vicinity thereof from the outside, and protects the rolling bearing portion from dust and dirt. Play a role. In addition, since the end surface of the outer ring portion 2 and the gap of the rolling bearing portion are hidden, the appearance is good. Moreover, even if water enters the inside of the roller R,
The water can be released to the outside through the drain hole 6f of the cover member 6. 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.

Further, in the above description, the adhesive injecting portion 2e is formed in the outer ring portion 2, but it is omitted, and when it is assembled to the roller R, it is previously attached to the outer peripheral surface of the outer ring portion 2. It is also possible to apply the agent beforehand. In this case, the three protrusions 6a of the cover member 6 are also omitted.

[0023]

According to the present invention, since the bearing portion between the outer ring portion and the inner ring portion is covered with the cover member from the outside, it is difficult for dust and the like to intrude into the inner bearing portion from the outside, and the bearing portion. Durability is improved. Also, the aesthetic appearance is improved by mounting the cover member. Moreover, the water that has entered the tubular member such as the roller can be easily discharged to the outside through the water drain hole formed in the cover member.

In the invention in which the labyrinth protrusion is formed on the inner ring portion, even if there is water or the like that tries to enter the inside through the gap between the cover member and the inner ring portion, the labyrinth protrusion prevents the entry, so that the labyrinth protrusion from the outside The waterproof effect against water etc. is enhanced.

[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]

 1 Resin Bearing 2 Outer Ring Part 2e Adhesive Injection Section 3 Inner Ring Part 3b Labyrinth Protrusion 5 Steel Ball 6 Cover Member 6a Protrusion 6d Center Hole 6f Drainage Hole

Claims (2)

[Claims] 1. A resin outer ring portion fitted inside an end portion of a tubular member, a resin inner ring portion arranged inside the outer ring portion, and a bearing portion between the outer ring portion and the inner ring portion. A cover member made of resin provided so as to cover at least the above, and a drain hole formed in the cover member so as to open in a bearing portion between the outer ring portion and the inner ring portion. Resin bearing. 2. The cover member has a center hole, the inner peripheral surface of the center hole is formed along the outer peripheral surface of the inner ring portion so as to surround the outer peripheral surface, and the outer peripheral surface of the inner ring portion has The resin bearing according to claim 1, wherein a labyrinth protrusion that annularly protrudes from the outer peripheral surface is formed inside the cover member.