JPH07127645A - Retainer for roller bearing - Google Patents

Abstract

PURPOSE:To provide a retainer for bearing which has the function restraining generation of fretting and abnormal sound, and can be easily fitted to a bearing. CONSTITUTION:Two circular arc shaped members 2, 3 provided with a plurality of pockets 7, 8 are continuously arranged into a ring shape, and one separated part 5 is welded so as to temporarily fasten them. Rollers are received in this retainer 1 in one division state, they are assembled in a bearing, the temporary fastened part is broken by stress during operation of the bearing, and respective circular arc shaped members 2, 3 are separated from each other so as to function as the two-piece divided retainer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage incorporated in a roller bearing, and more particularly to improvement of a cage which prevents generation of abnormal noise during fretting and operation.

[0002]

2. Description of the Related Art In a roller bearing, when a load accompanied by vibrations is applied while the roller and the race member are held at the same position, fretting occurs on the surface of the race member, and the fretting occurs during operation. Abnormal noise is likely to occur.

As means for preventing such fretting and the like, conventionally, there are known a method in which pockets of a cage for accommodating rollers are provided with an unequal pitch and a method in which the cage is divided.

The cage having the pockets of unequal pitch has an effect of delaying the progress of fretting because each roller can be prevented from stopping at the same position because the intervals of the pockets are different from each other. However, due to the integral structure of the cage, relative rotation between the roller and the race member cannot be expected inside the bearing, and therefore, when the roller is held in the same position and subjected to a vibration load for a long time. However, there is a problem that the occurrence of fretting cannot be completely prevented. Further, in order to form a large number of pockets on the peripheral surface of the ring-shaped cage at an unequal pitch, it is necessary to machine all the products by cutting work, which requires time and labor for manufacturing, and there is a problem of poor mass productivity. is there.

On the other hand, the split type cage is conventionally divided into a split cage and a split cage, and since each portion of the split cage is likely to rotate relative to the track member, It has an excellent effect of suppressing coating and the like.

However, in the case of the split cage, the material of the cage is almost limited to synthetic resin, so that there is a limit to its use under high temperature conditions. It is also conceivable that the split cage is made of metal to eliminate restrictions on the operating conditions such as temperature.However, such a split type cage made of metal is used after forming pockets on the ring-shaped member. If the peripheral surface is cut and divided, the stress remaining in the inside of the cage is released due to the formation of the pocket, and there is a problem that the cut portion is largely opened.

On the other hand, in the two-divided cage, a portion of each of the divided cages to which no load is applied causes relative rotation, and causes relative rotation of the other portions. Relative rotation is obtained, and it has superior characteristics in suppressing fretting compared to cages of other structures. However, this split cage has a drawback that it is difficult to assemble it into the bearing and the assemblability is poor because it is necessary to assemble each part of the separated cage between the raceway members.

The present invention has been made in order to solve the above problems, and has an excellent function of suppressing fretting during operation of a bearing, as well as excellent assemblability and manufacturability, and temperature conditions during use. It is an object of the present invention to provide a cage for roller bearings that is not limited to.

[0009]

In order to solve the above problems, the first means of the present invention is to connect two or more arc-shaped members having a plurality of roller storage pockets in a circumferential direction. A ring-shaped member is formed, and 1 between the connected arc-shaped members is formed.
Temporarily fix the other arcuate members with the parts separated, and the coupling force from the temporary fix is determined by the stress acting on each arcuate member from the bearing components that rotate relative to each other when assembled in the bearing. Was set to be small.

The second means of the present invention is to separate a ring-shaped member having a plurality of pockets for accommodating rollers on its circumferential surface at one circumferential position, and to surround the ring-shaped member other than the separated portion. A weakened portion is provided at least at one or more places on the surface, and the fracture strength of this weakened portion is larger than the thermal stress acting on the ring-shaped member during heat treatment for stress relief, and the relative strength when assembled in the bearing is high. The stress was set within a range smaller than the stress acting on the ring-shaped member from the rotating bearing components.

[0011]

In the first means, the rollers are housed in the pockets of each arcuate member and assembled in the bearing in a state where the roller is divided into one and divided. When the bearing rotates in this state and stress is applied to the retainer from the components of the bearing that rotate relative to each other, the temporary fixing portions are separated, and the arcuate members are divided into respective parts.

In the second means, heat treatment is applied to the ring-shaped member in a state where the peripheral surface of the ring-shaped member is continuous, the internal stress is removed, and then one portion of the peripheral surface of the ring-shaped member is separated. Put the rollers in the pockets and assemble them into the bearing.
When the bearing is rotated in this assembled state, the stress acting from the component parts of the bearing destroys the weak portion, and the cage is separated into a plurality of members.

[0013]

1 to 5 show a cage according to a first embodiment. As shown in FIGS. 1 and 2, the cage 1 of this embodiment has a structure in which two arc-shaped members 2 and 3 are arranged in a ring shape so as to be continuous in the circumferential direction, and the two arc-shaped members 2 and 3 are arranged between them. One of the separating portions 4 and 5 is placed in a separated state,
The other separation part 5 is temporarily fixed by welding (weld part 6 here).

As shown in FIGS. 3 to 5, the arcuate members 2 and 3 are formed in a substantially semicircular shape as a whole, and a plurality of roller storage pockets 7 are provided on the peripheral surface at predetermined intervals. 8 is formed. Further, after the pocket is formed, a heat treatment such as a soft nitriding process is performed to remove the residual stress generated inside during the bending process and the pocket forming process.

Further, the joining force at the welded portion 6 is set to a level of weak temporary fixing, and the components of the bearing (shaft, outer ring, roller) that rotate relative to the bearing when the retainer is incorporated in the bearing. Is set to be smaller than the stress acting on the cage 1.

The cage 1 formed as described above is shown in FIG.
As shown in FIG. 5, the rollers 9 are respectively housed in the pockets 7 and 8 of the arcuate members 2 and 3 having one end connected, and the rollers 9 are housed in the shafts 10.
And the outer ring 11 to assemble the roller bearing.

In the state where the cage 1 is incorporated in the bearing as described above, the cage 1 functions as a split cage in which one portion of the circumferential surface is separated, and the split cage is formed at the beginning of the operation of the bearing. The structure suppresses the occurrence of fretting.

Further, when the bearing enters a normal operating state, the stress acting on the cage 1 from the shaft 10 or the outer ring 11 or the rollers 9 of the bearing which rotates relatively causes the welded portion 6 between the arcuate members 2 and 3. The arc-shaped members 2 and 3 are broken and completely separated. As a result, the cage 1 functions as a halved cage, and the rollers 9 and the outer ring 11 rotate relative to each other by the separated arc-shaped members 2 and 3, thereby suppressing the occurrence of fretting and noise. Therefore, the life extension effect of a large bearing can be exhibited.

In the above example, the cage 1 is formed by the two arc-shaped members 2 and 3, but the cage is formed by connecting three or more arc-shaped members in the circumferential direction. Good. In this case, one place between the arcuate members connected to each other is separated, the other arcuate members are temporarily fixed by welding or the like, and the rollers are assembled in the pockets in this temporarily fixed condition to form a roller bearing. Assemble to Also, when each temporary stop is separated by the operation of the bearing, it functions as a cage for 30% or more,
It is possible to exert a greater effect of suppressing fretting.

On the other hand, FIGS. 7 to 9 show a second embodiment. As shown in FIGS. 7 and 8, the cage 21 of this embodiment separates one part of its peripheral surface from a ring-shaped member 22 having a plurality of roller storage pockets 23 provided on its peripheral surface ( Separation part 24), the peripheral surface facing this separation part 24,
After the parts have been separated, they are joined together by temporarily fixing them by welding, and a weakened portion (hereinafter referred to as a fragile portion) 25 is formed by the joining.

FIG. 9 shows a process of forming the cage 21. First, as shown in FIGS. 9 (a) and 9 (b),
The ring-shaped member 22 is formed by temporarily fixing the separation portion 27 of the metal split cage 26 by welding. Next, the ring-shaped member 22 is formed into a continuous ring shape by the temporary fixing.
Then, a heat treatment such as a soft nitriding treatment is applied to remove the residual stress generated inside by bending or pocket forming.

Then, the circumferential surface of the ring-shaped member 22 facing the temporarily fixed fragile portion 25 is cut with a cutter or the like as shown in FIG. The ring-shaped member 22 is obtained.

Here, the welding force of the fragile portion 25 by welding is set to a level of weak temporary fixing, the fracture strength of that portion is larger than the thermal stress applied to the ring-shaped member 22 during the heat treatment, and With the cage assembled in the bearing, the stress is set within a range that is smaller than the stress acting on the cage 21 from each component (shaft, outer ring, roller) constituting the bearing.

In the cage 21 having the above structure,
As shown in FIGS. 7 and 8, each pocket 23 is temporarily fixed.
The roller is housed in and is installed between the roller bearing shaft and the outer ring.

In this state, as in the first embodiment described above, the cage 21 functions as a split cage at the beginning of the operation of the bearing, and the bearing enters a normal operating state.
When a stress exceeding the breaking strength of the fragile portion 25 is applied from each component of the bearing that rotates relative to each other, the fragile portion 25 is separated, and the cage 21 functions as a split cage.

In the second embodiment, the peripheral surface of the ring-shaped member 22 is partially separated and then temporarily fixed to form the fragile portion 25. However, as shown in FIG. It is also possible to make a cut 32 on the peripheral surface of the ring-shaped member 31 using a cutter or the like and form the fragile portion 33 by the cut 32.

Further, in the above example, the cage is divided into two to form a split cage, but the ring-shaped member 2
It is also possible to provide three or more fragile portions 25, 33 on the peripheral surface of 2, 31 so that the cage can be divided into three or more parts.

Further, although the shaft 10 is shown as a component of the bearing, it may be an inner ring.

[0029]

As described above, the cage according to the present invention can be installed in the bearing in a split state and guides the rollers while splitting the split bearing into two or more while the bearing is in operation. It is possible to combine the ease of assembling the bearing with a great effect of suppressing fretting and abnormal noise during operation.

Further, according to the second means of the present invention, by performing heat treatment for stress relief in a continuous shape of the ring-shaped member, thermal deformation of the cage can be prevented, and the split type metal holder is used. The vessel can be formed with high precision.

[Brief description of drawings]

FIG. 1 is a front view showing a cage according to a first embodiment.

FIG. 2 is a vertical sectional front view of the same.

FIG. 3 is a perspective view showing a state in which the above cage is divided.

FIG. 4 is a side view of the above arcuate member.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a vertical sectional front view showing a roller bearing incorporating the same cage.

FIG. 7 is a vertical sectional side view showing a cage according to a second embodiment.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

9 (a), (b), and (c) are views showing a process of forming the same cage, respectively.

FIG. 10 is a front view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cage 2, 3 Arc member 4, 5 Separation part 6 Welding part 7, 8 Pocket 9 Roller 10 Shaft 11 Outer ring 21 Cage 22, 22 Ring member 23 Pocket 24 Separation part 25, 33 Weak part

Claims (2)

[Claims] 1. A ring-shaped member is formed by connecting two or more arc-shaped members having a plurality of roller storage pockets in a circumferential direction, and one place between the connected arc-shaped members is separated. In this condition, the other arcuate members are temporarily fastened, and the coupling force due to the temporary tacking is made smaller than the stress acting on each arcuate member from the components of the bearing that rotate relative to each other when assembled in the bearing. Cage for roller bearing set to. 2. A ring-shaped member having a plurality of pockets for accommodating rollers on the circumferential surface is separated at one location in the circumferential direction, and the strength is provided at least at one or more locations on the circumferential surface of the ring-shaped member other than the separated portion. A weak portion is provided, and the fracture strength of this weak portion is larger than the thermal stress acting on the ring-shaped member during the heat treatment for stress removal, and the components of the bearing that rotate relative to each other when assembled in the bearing form a ring-shaped member. A cage for roller bearings set within a range smaller than the stress acting on the member.