JPH0571436U - Rolling bearing with resin outer ring - Google Patents

Abstract

(57) [Abstract] [Purpose] The frictional force between the outer ring and outer ring of the bearing with resin outer ring is increased, and the retaining flanges on both sides of the outer ring are made unnecessary and the width of the bearing is reduced. To let. [Structure] The outer diameter surface of the outer ring 24 is roughened by a shot blast method or the like, and the inner diameter surface of the outer ring 32 is press-fitted to the rough surface 34.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rolling bearing with a resin outer ring.

[0002]

[Prior Art]

 Rolling bearings with a resin outer ring, in which a resin outer ring is fitted to the outer diameter surface of the bearing outer ring, are rolling bearings for abutting rollers of copying machines, mirror pulleys, abutting rollers of printers / plotters, carriages, etc. Is being widely adopted by. By the way, if the bearing outer ring is made of metal, it is possible to easily secure the specified pull-out force only by pressure fitting with the outer ring, but if it is a resin outer ring, plastic deformation will occur if the tightening margin is increased to some extent. Therefore, it is necessary to use other measures together in order to secure the necessary drawing force.

In the method of injection-molding resin on the outer diameter surface of the outer ring, since the peripheral edge portions of the resin outer ring engage with the tapered portions at both ends of the outer diameter surface, a predetermined pullout force can be secured relatively easily. However, this method must solve another problem of excessive pressure fitting with the outer ring due to cooling shrinkage of the resin outer ring depending on the size.

Therefore, as a method not using injection molding, two large and small inward flanges 12 and 14 are integrally formed on both ends of the resin outer ring 10 as shown in FIG. 3, and these two inward flanges 12 and 14 are formed. The structure in which the bearing outer ring 16 is sandwiched between 14 is adopted. In this structure, the bearing outer ring 16 is inserted into the outer ring 10 from the smaller inward flange 12 side, and at this time, the tapered portion 18 of the outer ring 16 pushes over the inward flange 12 and gets over it.

[0005]

[Problems to be solved by the device]

 In the structure shown in FIG. 3, the bearing is thickened by the thickness of the two inward flanges 12 and 14. Considering the strength of the inward flange, this thickness is at least 0. Since 5 mm is required, an additional thickness of 1.0 mm is required for the inward flanges on both sides. Therefore, the inward flange has been an obstacle in making the bearing compact.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention roughens the outer diameter surface of the bearing outer ring, and press fits the resin outer ring to this rough surface.

[0007]

[Action]

 The inner surface of the resin outer ring bites into the minute irregularities on the rough surface of the bearing outer ring to create the anchor effect, increasing the retaining force of the outer ring.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 20 is a ball bearing, 22 is an inner ring, 24 is an outer ring, 26 is a ball, 28 is a retainer, and 30 is a seal plate. As shown in FIG. 2, countless minute irregularities are formed uniformly on the outer diameter surface of the outer ring 24 by the shot blasting method, and the inner diameter surface of the polyethylene outer ring 32 is press-fitted to the rough surface 34. ing. The outer ring 24 is press-fitted into the outer ring 32 in the direction of arrow a in FIG. 2. At this time, the tapered portion 36 formed on the peripheral edge of the outer ring 24 serves as a guide surface for smooth press-fitting.

The roughness of the rough surface 34 may be, for example, about Rmax 6 μm. Since the roughness of the outer surface of a normal outer ring is about Rmax 1 μm, it means that the roughness is 6 times. The rough surface 34 can be formed by a method other than the shot blasting method, and for example, a rough surface can be formed even by a minute spiral groove formed by turning.

When the outer diameter surface of the outer ring is roughened in this manner, the inner peripheral surface of the outer ring 32 bites into the minute irregularities of the rough surface 34 to generate an anchor effect, and the pulling force of the outer ring 32 increases. .. The applicants compared the pulling force of a normal outer ring that has not been roughened with the pulling force of an outer ring that has been roughened as in the present invention. Was confirmed to be increased 5 to 10 times.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, polyethylene was used as the outer ring material and the roughness of the outer ring outer diameter surface was set to about Rmax 6 μm. However, other resin such as nylon or polyacetal can be used as the outer ring material. May increase or decrease the roughness appropriately according to the physical properties such as hardness of the resin used.

[0012]

[Effect of the device]

 As described above, in the present invention, the outer ring outer diameter surface of the bearing is roughened, and the resin outer ring is press-fitted to this rough surface, so that the inner diameter surface of the resin outer ring bites into the rough surface and the anchor effect is obtained. As a result, the pulling force of the outer ring can be increased. Therefore, sufficient drawing force can be secured without forming inward flanges on both sides of the outer ring, and by making the width of the resin outer ring the same as the bearing, the bearing with resin outer ring can be made compact. Can be planned.

[Brief description of drawings]

FIG. 1 is a sectional view of a bearing with a resin outer ring according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the bearing shown in FIG.

FIG. 3 is a sectional view of a conventional bearing with a resin outer ring.

[Explanation of symbols]

 20 ball bearing 22 inner ring 24 outer ring 32 resin outer ring 34 rough surface

Claims (2)

[Scope of utility model registration request] 1. A rolling bearing with a resin outer ring, wherein an outer diameter surface of a bearing outer ring is roughened, and a resin outer ring is press-fitted on the rough surface. 2. The rolling bearing with a resin outer ring according to claim 1, wherein the outer diameter surface of the bearing outer ring is roughened by a shot blasting method.