JPH0968237A - Manufacture of bearing ring of two-point contact split type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the finishing process, and to improve the quality by forming the longitudinal section of a bearing surface with the spherical surface of the radius of curvature larger than the radius of a ball, manufacturing the stock for a bearing ring whose width is larger than a completed article, splitting the article into two along the center line in the width direction, and cutting the split section. SOLUTION: In an outer ring stock 2', the longitudinal section of the bearing surface 2a' is formed by a spherical surface having the radius (r) larger than the radius (d) of a ball 3 by the prescribed value, and the width B' is manufactured larger than the width B of a completed article 2 by the prescribed value S. The bearing surface 2a' is achieved to the final finish before the splitting process. Because the bearing surface 2a' of the outer ring stock 2' is spherical, it can be machined in the same manner as the normal one. After the bearing surface 2a' is finished, a circumferential groove 2b' is machined to move to the next splitting process. After the outer ring stock 2' is split, the split surface of each split body is cut by the quantity corresponding to the dimension S. The manufacturing process can be simplified and the quality can be improved thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a split-type race ring having a raceway surface having a shape of two-point contact with a ball, for example, production of an inner ring or an outer ring such as a four-point contact ball bearing or a one-way clutch. Can be used for.

[0002]

For the purpose of applying an axial preload, supporting an axial load, reducing the contact surface pressure, etc.
In some cases, the raceway surface of the bearing ring may have a shape that makes two-point contact with the ball, such as an elliptical shape, a spherical shape, or a V shape. However, there are the following problems in finishing the raceway surface. That is, the raceway surface of the raceway is usually superfinished, but when the raceway surface is drawn with a single spherical surface (R surface) like the inner and outer rings of a standard deep groove ball bearing,
By swinging the grindstone along the axial curvature of the raceway surface, the entire raceway surface can be superfinished by one setup change. However, when the vertical section of the raceway surface is drawn in the above-described shape, this superfinishing cannot be performed, and therefore it is necessary to use tumbler finishing or leave it on the ground surface. Therefore, the manufacturing process may be complicated, and required quality may not be ensured.

The present invention is intended to simplify the finishing process of the raceway surface and improve the quality of the two-point contact split type raceway ring.

[0004]

According to the present invention, a vertical cross section of a raceway surface is drawn by a single spherical surface having a radius of curvature larger than a radius of a ball by a predetermined amount, and a width dimension of the finished product is a predetermined dimension. The bearing ring material is made larger, and the bearing ring material is divided into two along the center line in the width direction, and then the divided surface of each divided body is machined by an amount corresponding to the above predetermined size.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to an outer ring of a one-way clutch will be described below. The one-way clutch shown in FIG. 1 includes an inner ring 1, an outer ring 2, and a raceway surface 1 of the inner ring 1.
A plurality of balls 3 interposed between a and the raceway surface 2a of the outer ring 2 and a cage 4 for holding the balls 3 are main components. The outer ring 2 has a two-divided structure, and a pair of left and right divided bodies are joined to each other at a divided surface to be integrated. A pair of seal members 6 are attached to the inner diameters of both ends of the outer ring 2.

As shown in the enlarged view of FIG. 2, the raceway surface 2a of the outer ring 2 has a radius of curvature r of two points having curvature centers of points O1 and O2 offset from each other by a dimension S in the axial direction.
Ball 3 and 2 points C drawn by two spherical surfaces 2a1 and 2a2
Angular contact with 1 and C2. The radius of curvature r is
It is larger than the radius d of the ball 3 by a predetermined amount (r> d).
A circumferential groove 2b is provided at the groove bottom portion of the raceway surface 2a. The reason why the circumferential groove 2b is provided on the raceway surface 2a is to mount a cage 4 which will be described later, and the outer ring 2 is divided into two parts so that the ball 3 is assembled between the raceway surfaces 1a and 2a, and the cage is formed. This is for facilitating the incorporation of 4 into the circumferential groove 2b. As the inner ring 1, the bearing inner ring of the standard deep groove ball bearing is used as it is.

The outer ring 2 is an outer ring material 2'shown in FIG. 3 (a).
From splitting process {Fig. (B)}, turning process {Fig. (C)}
Can be obtained through. Outer ring material 2'is raceway surface 2
The vertical cross section of a'is drawn with one spherical surface having a radius of curvature r larger than the radius d of the ball 3 by a predetermined amount (the point O is the center of curvature), and the width dimension B'is the finished product 2 It is manufactured by a predetermined dimension S larger than the width dimension B of FIG. (D)} (B'-B = S). The raceway surface 2a 'is processed by final finishing (super finishing) before entering the dividing process.
However, since the raceway surface 2a 'of the outer ring material 2'has a single spherical shape, the outer ring material 2'can be processed in the same manner as the outer ring of a normal deep groove ball bearing. Then, after the finishing of the raceway surface 2a 'is completed, the circumferential groove 2b' is grooved,
Enter the next division process. In addition, a V-shaped notch 2c ′ is formed on the outer periphery of the outer ring material 2 ′ at the planned dividing portion, that is, the outer periphery of the center in the width direction.
Is provided. This notch 2c 'is formed by forging (simultaneous forging with the material shape) or turning.

As shown in FIG. 3B, in this embodiment, natural division is adopted as the dividing means. That is, the notch 2 provided on the outer circumference of the outer ring material 2'in the width direction
Adapt the breaking tool 7 to c ', apply pressure in the direction shown by the arrow in the figure, and cause the material to crack from the bottom portion of the notch 2c', and move the outer ring material 2'to the center line in the width direction. To divide.

After the outer ring material 2'is divided, as shown in FIG. 3 (c), the divided surface of each divided body is turned by an amount corresponding to the dimension S (each S / 2). As in this example,
When natural division is adopted as the dividing means, the machining allowance at the time of division is not necessary, and therefore the total amount of the cutting allowance is the same as the dimension S. In the case of adopting cutting division or the like as the dividing means, the amount obtained by subtracting the division machining allowance from the dimension S may be used as the total amount of the cutting machining allowance.

As described above, when the two divided bodies obtained by turning the divided surfaces by the amount corresponding to the dimension S are aligned with each other on the divided surfaces, the integral outer ring 2 as shown in FIG. 3D is completed. To do.

As shown in FIG. 4, the cage 4 has an annular portion 4a fitted and fitted in the circumferential groove 2b of the outer ring 2, and an annular portion 4a.
From a plurality of pillars 4b continuously extending from the inner diameter side to the inner circumference, a pocket 4c surrounded by the annular portion 4a and the pillars 4b adjacent in the circumferential direction, and a pocket-side wall surface of the annular portion 4a. The cam surface 4d is provided. In addition, in this embodiment, the cage 4 is a split ring having one split port 4e, and it freely expands or contracts when an external force is applied from the inner diameter side or the outer diameter side, and when the external force is removed, the cage retains its original shape. Return to the state of. Outer diameter D of cage 4 in its natural state
Is set to be approximately the same as the diameter of the groove bottom portion of the circumferential groove 2b of the outer ring 2. “Similar” includes the case of being apparently the same (within the range of manufacturing error) and the case of being slightly small.

As shown enlarged in FIG. 5, the cam surface 4d of the cage 4 is a tapered surface inclined by an angle θ with respect to the tangent line L at the contact point C3 with the raceway surface 1a of the ball 3. This inclination angle θ may be set based on a general value for a one-way clutch. Since the cam surface 4d has such a shape, a wedge gap is formed between the cam surface 4d and the raceway surface 1a, which is reduced in one direction (the left rotation direction in the figure).

FIG. 5 shows a state in which the ball 3 is separated from the wedge gap. In this state, the ball 3 contacts the raceway surface 1a at one point C3 and the raceway surface 2a and two points C1.
・ Rolls while contacting at C2, and functions as a normal bearing rolling element. Therefore, the rotation torque is blocked between the outer ring 2 and the inner ring 1, and the outer ring 2 idles with respect to the inner ring 1. At the same time, the radial load and the axial load from the outer ring 2 are supported by the plurality of balls 3. On the other hand, from the state shown in the same figure, when the ball 3 moves relative to the cage 4 in the counterclockwise rotation direction and presses the cam surface 4d, the cage 4 slightly expands in diameter, and the cage 4 on the side opposite to the pocket side of the annular portion 4a. The wall surface (outer diameter D) is pressed against the groove bottom portion of the circumferential groove 2b. Then, when the ball 3 further moves (or tries to move relatively) to the left in this state from this state, the ball 3 is completely engaged with the wedge gap formed between the cam surface 4d and the raceway surface 1a. , The ball 3 is locked. As a result, the rotational torque from the outer ring 2 is transmitted through the route of the outer ring 2 → the cage 4 → the ball 3 → the inner ring 1, and the inner ring 1 rotates integrally with the outer ring 2.

This one-way clutch is constructed so that the engagement and disengagement of the ball 3 with respect to the wedge clearance as described above is automatically performed by the rotation of the cage 4 with respect to the outer ring 2. As described above, the outer diameter D of the cage 4 in the natural state (the state in which the force is not received from the ball 3)
Is set to be approximately the same as the diameter of the groove bottom portion of the circumferential groove 2b. Therefore, when the outer ring 2 rotates, the frictional force due to the contact between the annular portion 4a and the circumferential groove 2b and the annular portion 4a and the circumferential groove 2b.
The viscosity of the oil film formed between the cage 4 and
Receives a force in the rotation direction from the outer ring 2 and rotates together.
For example, in FIG. 5, when the outer ring 2 rotates in the left rotation direction, the retainer 4 is dragged by the rotation of the outer ring 2 and rotates together with the left rotation direction. Therefore, the ball 3 relatively moves in the clockwise direction relative to the cage 4 and separates from the wedge gap,
The rotational torque is cut off. From this state, when the rotation of the outer ring 2 is switched to the right rotation direction, the cage 4 is dragged by the rotation of the outer ring 2 and rotates together with the right rotation direction. Therefore, while the ball 3 rolls on the raceway surface 2a, the cage 4
In contrast, it moves relative to the counterclockwise direction and engages in the wedge gap,
Rotational torque is transmitted. That is, torque transmission / disengagement of the clutch is automatically switched by a change in the relative rotation direction of the outer ring 2 with respect to the inner ring 1.

The switching response of the one-way clutch depends on the rotational force of the cage 4 and the shape of the cam surface 4d (inclination angle θ).
Etc.) and the clutch clearance, etc., so it is advisable to optimally set these elements according to the usage conditions and the like.

[0016]

According to the present invention, before entering the dividing step,
By finishing the raceway surface of the outer ring material, the raceway surface can be finished in the same way as the raceway of a normal deep groove ball bearing, so the manufacturing process can be simplified compared to the conventional method. At the same time, the quality can be improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view (FIG. A) and a lateral sectional view (FIG. B) of a one-way clutch according to an embodiment.

FIG. 2 is an enlarged sectional view showing a raceway surface of an outer ring.

FIG. 3 is a cross-sectional view showing a manufacturing process of an outer ring.

FIG. 4 is a cross-sectional view of a cage.

FIG. 5 is an enlarged cross-sectional view showing a peripheral portion of a cam surface of a cage.

[Explanation of symbols]

 2 outer ring 2a raceway surface 3 ball 2'outer ring material 2a 'raceway surface

Claims (1)

[Claims] 1. A method for manufacturing a two-point contact split type race ring, comprising a pair of left and right split bodies, which are joined together at split surfaces to form a single body, and which has a raceway surface that makes two-point contact with a ball. Draw a longitudinal section with a single spherical surface having a radius of curvature that is larger than the radius of the ball by a certain amount, and manufacture a race ring material with the width dimension increased by a predetermined dimension relative to the finished product. A method for manufacturing a two-point contact split type rail wheel, which comprises splitting the split surface of each split body by an amount corresponding to the predetermined dimension after splitting the split surface along the direction centerline.