JPS5850946Y2 - Rollers such as roller skates - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a freely rotatable roller that is attached to a roller shaft of a roller skate or the like.

BACKGROUND ART Rollers such as roller skates have a structure in which a pair of ball bearings are fitted back to back into a center hole provided in a roller body made of plastic or the like.

The conventional outer ring of the above-mentioned ball bearing is made of metal, as shown in, for example, Japanese Patent Publication No. 52-23791, but this is disadvantageous in terms of cost as it requires time and effort to process.

In order to solve this problem, the applicant of the present invention manufactured the outer ring from plastic and conducted various experiments, and found that in this ball bearing, the plastic outer ring was able to fit into the roller body as strongly as the metal outer ring. When inserted into the insertion hole,
It has been found that this causes the plastic outer ring to deform and impair its function as a ball bearing.

Therefore, if the ball bearing is used loosely inserted into the roller body, there is a problem that slippage occurs between the roller body and the outer ring, generating frictional heat.

This invention eliminates the above conventional problems by providing a plurality of protrusions on the outer peripheral surface of the plastic outer ring at required intervals in the axial direction. The purpose is to provide rollers.

An embodiment of this invention will be described below with reference to the drawings.

Figure 1 shows an embodiment of this invention. In the figure, 1 is a roller body made of plastic or the like, and this roller body is rotated by a roller shaft 3 via two ball bearings 2a and 2b. It is freely supported.

Since the ball bearings 2a and 2b have the same configuration,
Only one ball bearing 2a will be explained, and the same parts in the drawings will be given the same reference numerals and the explanation of the other ball bearing 2b will be omitted.

The ball bearing 2a is made up of a Tato ring 4, an inner ring 5, and a plurality of steel balls 6.

As shown in FIG. 2, the outer ring 4 is a cylindrical body made of plastic, and has a small hole 10 formed in the center of one end surface in the axial direction, and has a smaller diameter hole 10 in the center of the other end surface in the axial direction. A large diameter hole 11 with an increased diameter is formed.

A curved surface is formed on the inner circumferential surface 12 of the outer ring between the large diameter hole 11 and the small diameter hole 10 in a shape that accommodates the steel ball 6.

On the other hand, a plurality of protrusions 14 are provided on the outer circumferential surface 13 of the outer ring 4 so as to protrude over the entire length in the axial direction.

As shown in FIG. 3, the inner ring 5 has a fitting hole 15 for fitting the roller shaft 3 in the center of the inner ring, and a flange 16 on the outer periphery of one end in the axial direction.

A thin guide protrusion 17 having a diameter smaller than that of the flange 16 is provided on the outer periphery of the flange 16 at a predetermined distance from the flange 16 toward the other end in the axial direction.

The steel balls 6 are interposed between the outer peripheral surface between the flange 16 protruding from the inner ring 5 and the guide protrusion 17, that is, the steel ball rolling surface 18, and the inner peripheral surface 12 of the outer ring 4. be done.

Thus, with a plurality of steel balls 6 housed in the outer ring 4, the axes of the outer ring 4 and the inner ring 5 are aligned with each other,
The steel balls 6 ride on the outer circumferential surface 17a of the guide protrusion 17 of the inner ring 5 while recessing and deforming the steel ball rolling surface 17a of the inner ring 5.
The ball bearing 2a is assembled by pressing the outer ring 4 and the inner ring 5 in relative directions such that the outer ring 4 and the inner ring 5 are relatively rotatable.

The roller body 1 has a center hole 20 centered around the axis.
Fitting holes 21, 21 are provided on both end surfaces of the roller main body 1 and are concentric with the center hole 20.

Further, the other axial end surfaces 5a, 5a of the inner rings 5, 5 of the ball bearings 2a, 2b are brought into contact with each other in the center hole 20, and the outer rings 4 of the ball bearings 2a, 2b are brought into contact with each other in the center hole 20.
, 4 in the axial direction other end surfaces 4a, 4a are connected to the center hole 20.
and the fitting holes 21, 21 are brought into contact with the boundary step portions 22 and 22, respectively.

Then, the roller shaft 3 fitted in the bracket 23 is inserted into the roller shaft insertion hole 15 of the inner ring 5 of the ball bearings 2a, 2b, and one end surface in the axial direction of the inner ring 5 of one of the ball bearings 2a protrudes outward. A tightening nut 24 is screwed onto the end of the roller shaft 3, and by tightening this tightening nut 24, the ball bearings 2a, 2b are secured as shown in FIG.
The roller main body 1 is rotatably supported by the roller shaft 3 via the roller shaft 3.

Note that the size of the protrusion 14 is small (for example, 0.1 m).
(m), not only is it impossible to prevent the relative rotation between the roller body 1 and the outer ring 4, but also the roller body 1 may be scraped.

For this reason, as shown in FIG. 4, the height of the protrusion 14 is set to 0.
Although it is desirable that the length be 5 mm or more and about 16 protrusions be provided, the number of protrusions 14 is not limited to the above.

As explained above, the roller of this invention, such as roller skates, is equipped with a pair of ball bearings having a plastic outer ring with a plurality of protrusions protruding from the outer circumferential surface at required intervals in the axial direction, and a pair of ball bearings mounted in the center hole of the roller body. The structure is such that the rollers are fitted back-to-back, so the function as a ball bearing is not impaired, and there is no slippage between the roller body and the outer ring of the ball bearing. Since ball bearings can be used, it has excellent effects such as low cost, high mass productivity, and easy implementation.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a longitudinal cross-sectional view of the entire roller shaft support device, Fig. 2 is a perspective view of the outer ring of the ball bearing used in the device of this invention, and Fig. 3 is a view of the ball bearing. FIG. 4 is a perspective view of the inner ring of the bearing and a front view of the outer ring of the ball bearing of this invention. 2a...Ball bearing, 2b...
Ball bearing, 4... Outer ring, 5...
・Inner ring, 6... Steel ball, 10... Small diameter hole, 11... Large diameter hole, 12... Inner peripheral surface,
13...Outer peripheral surface, 14...Protrusion, 15
...Roller shaft insertion hole, 16...Flame,
17... Guide protrusion, 18... Steel ball rolling surface, 20... Center hole.

Claims (1)

[Scope of utility model registration request] A small diameter hole 10 is provided at the center of one end surface in the axial direction, and a large diameter hole 11 larger than the small diameter hole 10 is provided at the center of the other end surface in the axial direction.
plastic outer rings 4 each having a substantially U-shaped cross section;
and a flange 16 on the outer periphery of one end in the axial direction, and a thin guide protrusion 17 having a smaller diameter than the flange 16 on the outer periphery at a predetermined distance from the flange 16 to the other end in the axial direction. The guide protrusions 17 and the flange 16 are integrally provided.
A hollow cylindrical inner ring 5 whose outer circumferential surface between the steel ball rolling surface 18 and a roller shaft insertion hole 15 is provided in the center, and an inner circumferential surface 12 of the outer ring 4 and the steel of the inner ring 5. A pair consisting of a plurality of steel balls 6 interposed between a ball rolling surface 18 and a plurality of protrusions 14 protruding from the outer circumferential surface 13 of the outer ring 4 at required intervals in the axial direction. ball bearings 2a, 2b
A roller such as a roller skate, characterized in that the rollers are fitted back to back into the center hole 20 of the roller body.