JPH0536091Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a bearing, especially a ball that can completely fill the annular space formed between the inner ring and the outer ring with rolling elements without using a cage. Regarding bearings.

[Conventional technology]

Conventionally, in radial ball bearings, SUJ-2 or SUS440C, etc., are milled as the material for the outer and inner rings, and then heat treatment, polishing, assembly, etc. are performed, which requires a considerable number of man-hours. Furthermore, since it is technically difficult to fill the space between the outer ring and the inner ring with rotating bodies without using a cage, various efforts have been made.

As a method of filling the annular space between the outer ring and the inner ring with rolling elements without using a cage, for example,
- As proposed in No. 14236, rolling elements are filled between an outer race, which is an outer race, and an inner race, which is an inner race, and a pair of rollers are moved from the outside and inside of each race toward the rolling elements. A method is known in which one of the races is rotated while applying pressure to form the race.

[The problem that the idea aims to solve]

For bearings that do not require high precision, such as bearings for toy racing cars and ball bearings used in casters, if high-quality materials are used and subjected to machining or heat treatment, the quality will be excessive and costs will increase. In addition, bearings have many parts such as sealing devices, and sealing devices are especially difficult for extremely small bearings.

This idea was made in view of these problems, and its purpose is to completely fill the annular space between the outer ring and the inner ring with rolling elements without using a cage, and to make it relatively easy to process. The object of the present invention is to provide a ball bearing that can reduce costs.

[Means to solve the problem]

That is, in order to solve the above-mentioned problems, this invention has an inner cover in which one peripheral edge of a cylindrical body made of plate material is bent radially inward to form a flange, and the peripheral edge is also bent radially inward. an outer ring into which a cylindrical outer cover is press-fitted, which is bent to form the other flange;
It consists of an inner ring made of forged material with raceway grooves on the outer circumferential surface and a circular or polygonal shaft hole that matches the cross-sectional shape of the shaft, and the annular space between the outer ring and the inner ring is filled with rolling elements. In the ball bearing, a sealing portion is formed in the gap formed between the flange of the outer ring and the outer circumferential surface of the inner ring, and the inner diameter of both the flange of the outer ring is in the vicinity of the pitch circle of the rolling element. It is characterized in that it is bent inward in the axial direction to form a diaphragm, and a portion radially inward from the diaphragm is a flat surface including a portion that guides the rolling element.

Alternatively, an inner cover is formed by bending one peripheral edge of a cylindrical body made of plate material inward in the radial direction to form a flange, and a cylindrical body in which the periphery of the cylindrical body is bent radially inward to form the other flange. It consists of an outer ring with an outer cover pressed into it, and an inner ring made of synthetic resin with raceway grooves on the outer circumferential surface and a shaft hole with a circular or polygonal shape to match the cross-sectional shape of the shaft. In a ball bearing in which an annular space is filled with rolling elements, a sealing portion is formed in a gap formed between a flange of the outer ring and an outer circumferential surface of an inner ring, and an inner diameter portion of both flange portions of the outer ring is formed. The rolling element is characterized in that the vicinity of the pitch circle of the rolling element is bent inward in the axial direction to form an aperture, and the area radially inward from the aperture is a flat surface including a portion that guides the rolling element.

[Effect]

The operation of the ball bearing of this invention as the means described above will be explained using the reference numerals in the attached drawings.

The apertures 6, 6 formed on both the flanges 11a and 12a of the outer ring 1 are connected to the flanges 11a and 12 on both sides of the outer ring 1.
Since a is narrowly narrowed toward the ball 3 to reduce the axial clearance with the ball 3, both flanges 11
When trying to guide the balls 3 with high accuracy through a and 12a, the rotational performance of the bearing does not deteriorate regardless of the outer ring width.

Further, in this means, the outer ring 1 has both flange portions 11a.
Since 12a is constricted toward the ball 3 side, the cross-sectional area is increased and the strength is improved compared to the case where it is not constricted, and it can withstand high loads. Furthermore, by bending both the flanges 11a and 12a of the outer ring 1 to form the apertures 6, 6, the gap can be made smaller than when no apertures are used, which is superior in terms of sealing performance.

〔Example〕

Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

FIG. 1 is an axial sectional view of the ball bearing of this invention, and FIG. 2 is a sectional view taken along the line X--X in FIG. Reference numeral 1 denotes an outer ring, which is constructed by press-fitting a cylindrical outer cover 12 into a cylindrical inner cover 11. 2 is the inner ring, which is manufactured by carving out forging material.

That is, in this invention, the outer ring 1 and inner ring 2 of the bearing are not machined, but the outer ring 1 is a press-formed product in which a plate material (steel plate) is formed into a cylindrical shape and the peripheral edge is bent by press working. . First, one peripheral edge of the cylindrical inner cover 11 made of a steel plate is bent radially inward by press working to form the flange 11a. Next, one peripheral edge of the cylindrical outer cover 12 made of a steel plate is bent radially inward by press working to form a flange 12a.

The inner ring 2 is made of a forged material, and a raceway groove 21 is formed on its outer peripheral surface by rolling, cutting, or grinding. The shaft hole 22 is machined to match the cross-sectional shape of the shaft (not shown); if the shaft has a circular cross-sectional shape, it is machined into a circular shape, and when the shaft cross-sectional shape is a polygon, such as a hexagon, it is machined into a hexagonal shape. Process it into a polygon like this.

Then, the balls 3 are filled into the raceway groove 21 in the annular space 5 between the inner cover 11 and the inner ring 2 without using a retainer, the inner cover 11 is covered, and the outer cover is attached to the inner cover 11. 12 is press-fitted. In this case, the gaps 4, 4 formed between the flanges 11a and 12a of the outer ring 1 and the outer peripheral surface of the inner ring 2 are made large enough to form a sealing part. The raceway surface 11c of the outer ring 1 that contacts the balls 3 may be flat or slightly curved.

Next, the vicinity of the pitch circle (PCD) of the flange 11a of the inner cover 11 and the flange 12a of the outer cover 12 is bent inward in the axial direction to form apertures 6, 6 near the balls 3 to prevent backlash. Process it like this. In this case, the radially inward direction from the apertures 6, 6, including the portion that guides the balls 3, is a flat surface. In other words, the apertures 6 and 6 are formed slightly closer to the outer diameter than the pitch circle, and the ball 3
is formed so that it is guided by a flat surface even on a pitch circle.

The embodiment of this invention has been described above, and its operation will now be explained.

The apertures 6, 6 formed on both flanges 11a and 12a of the outer ring 1 are formed by narrowing the flanges 11a and 12a on both sides of the outer ring 1 toward the balls 3 so as to reduce the axial clearance with the balls 3. Therefore, when the balls 3 are to be guided with high precision by both the flanges 11a and 12a, the rotational performance of the bearing does not deteriorate regardless of the outer ring width. Therefore, the outer ring width can be increased as needed and is not restricted more than necessary.

In addition, in this invention, both the flanges 11a and 12a of the outer ring 1 are constricted toward the ball 3 side, so the cross-sectional area is increased and the strength is improved compared to a case where the outer ring 1 is not constricted, and can withstand high loads. Furthermore, both flanges 11 of the outer ring 1
By bending a and 12a to form the apertures 6, 6, the gap can be made smaller than when no apertures are used, which is superior in terms of sealing performance. This is because, for example, if the outer ring is tilted by the same amount, both flanges 11a and 12a of the outer ring 1 are closer to the center of the bearing than when the aperture 6 is formed and when the aperture 6 is not formed. The amount of approach of the portions 11a and 12a to the inner ring 2 is reduced, and therefore, in order to prevent contact between the flanges 11a and 12a of the outer ring 1 and the outer peripheral surface of the inner ring 2 when the outer ring 1 is tilted, the aperture 6, 6 is better.

3 is an axial sectional view of a modified embodiment of the embodiment shown in FIG. 1, and FIG. 2 is an enlarged view of the P section of 1. In this case as well, as shown in FIG. 1, the outer ring 1 is constituted by press-fitting a cylindrical outer cover 12 into a cylindrical inner cover 11, and is held only by the shims of these. Therefore, in the same way, in order to withstand even higher loads, the peripheral edge 12b on the opposite side of the flange 12a formed on the outer cover 12 is connected to the radius of the corner of the inner cover 11.
Tighten and bend to fit.

By configuring the ball bearing as described above, it is possible to provide a raceway in the outer ring 1 and the inner ring 2 to restrict the movement of the balls 3 in the axial direction, and the assembly is also very simple. Furthermore, if the shaft to be fitted into the shaft hole 22 of the inner ring 2 has a polygonal cross-sectional shape, creep can be prevented by forming the shaft hole 22 into a polygonal shape to match the shape of the shaft.

FIG. 4 shows a modified embodiment in which the inner ring 2 in FIG. 3 is replaced with an inner ring 2' made of synthetic resin, and the other configurations are the same as those in FIGS. 1 and 3. By making the inner ring 2' of synthetic resin in this way, it is possible to reduce the weight of the bearing.

[Effect of idea]

Since the ball bearing according to this invention has the structure described in detail above, it can be manufactured with a small number of man-hours, and the sealing device can also be constructed relatively easily. Further, since no retainer is required and the rolling elements can be completely enclosed, durability is achieved and manufacturing costs are low.

In particular, press-fitting a cylindrical outer cover into a cylindrical inner cover and crimping the peripheral edge of the outer cover is effective in withstanding high loads and extending the life of the bearing.

[Brief explanation of the drawing]

Fig. 1 is an axial sectional view of a ball bearing according to this invention, Fig. 2 is a sectional view taken along the line X-X in Fig. 1, and Fig. 3 1 is a modified embodiment of the embodiment shown in Fig. 1. In the axial sectional views, FIG. 2 is an enlarged view of the P section of 1, and FIG. 4 is another modified embodiment. 1...Outer ring, 2...Inner ring, 3...Ball, 4...Sealing part, 5...Annular space, 6...Aperture, 11...Inner cover, 12...Outer cover, 12b...Outer cover periphery End, 21... raceway groove, 22... shaft hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An inner cover having a flange formed by bending one peripheral edge of a cylindrical body made of plate material radially inward; An outer ring into which the outer cover of the cylindrical body forming the other flange is press-fitted, and an inner ring made of forged material with raceway grooves on the outer circumference and whose shaft hole is circular or polygonal to match the cross-sectional shape of the shaft. In a ball bearing in which the annular space between the outer ring and the inner ring is filled with rolling elements, a sealing part is formed in the gap formed between the flange of the outer ring and the outer peripheral surface of the inner ring, Further, the inner diameter portions of both flanges of the outer ring are bent inward in the axial direction near the pitch circle of the rolling element to form a throttle, and the area radially inward from the throttle is a flat surface including a portion that guides the rolling element. A ball bearing characterized by the following. (2) An inner cover made of a cylindrical body made of plate material, one peripheral edge of which is bent radially inward to form a flange, and a cylinder whose peripheral edge is bent radially inward to form the other flange. It consists of an outer ring into which the outer cover of the body is press-fitted, and an inner ring made of synthetic resin with raceway grooves on the outer circumferential surface and a shaft hole with a circular or polygonal shape to match the cross-sectional shape of the shaft. In a ball bearing in which an annular space between the ball bearings is filled with rolling elements, a sealing portion is formed in a gap formed between the flange of the outer ring and the outer peripheral surface of the inner ring;
Further, the inner diameter portions of both flanges of the outer ring are bent inward in the axial direction near the pitch circle of the rolling element to form a throttle, and the area radially inward from the throttle is a flat surface including a portion that guides the rolling element. A ball bearing characterized by the following. (3) The cylindrical outer cover constituting the outer ring is characterized in that the peripheral end opposite to the flange is bent by crimping so as to follow the radius of the corner of the inner cover. The ball bearing described in item 2.