JPH09280256A - Rolling bearing having flexible part at contact part with roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely and smoothly rotate a bearing in such a state that the backlash is constantly zero by keeping the pre-load keeping force required for a roller by the elasticity of a flexible part, and absorbing and mitigating the thermal strain due to heat generation or small impact strain by the flexible part. SOLUTION: A bearing is provided with a flexible part 9 to elastically support a roller 3 which is formed by an annular recessed part 8 on the axial orthogonal plane on contact parts 4, 5 with an outer ring 2 or an inner ring 1, or the roller 3 for both the inner and outer rings 3. The bearing is precisely and smoothly rotated in such a state that the backlash is constantly zero by absorbing and mitigating the thermal strain due to heat generation or the fine impact strain by the flexible part 9 by keeping the pre-load keeping force required for the roller 3 with the elasticity of the flexible part 9. The pre-load is applied by making use of the restoration force after the bearing is assembled by the special final working of the contact parts 4, 5, and an arbitrary load by the hydraulic force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing having a flexible portion at a contact portion with a roller.

[0002]

2. Description of the Related Art As shown in FIG. 5, an outer ring 51 and an inner ring 52.
A rolling bearing (ball bearing) in which a roller 53 is rotatably inserted between is typically used. When this bearing is inserted into the precise and strong bearing fixing portion 54 and the shaft 55 is precisely fitted into the inner ring 52, the rolling surface of the roller 53 has almost no flexibility.

[0003]

When a bearing of this type is deformed due to a large axial load or heat generated by high-speed rotation, it has no flexibility to absorb the deformation, so that excessive stress is applied to the roller contact portion. Often results in damage to the bearing.

In order to ensure smooth rotation in a rolling bearing, it is customary to provide a slight backlash (clearance / backlash) on the roller and its contact portion. For this reason, the rolling bearing alone cannot be used as a precision bearing, and it is customary to use two or more bearings for the spindle of a machine tool or the like. This means that the fixed part of the bearing and the shaft must be precisely machined, and the structure is complicated.
It has become expensive.

According to the present invention, a part of the roller contact portion of the rolling bearing is supported by a flexible member (usually a diaphragm type),
This member can be preloaded to reduce the backlash (clearance / backlash) of the roller, and the flexible portion absorbs minute deformation due to axial load or thermal strain, allowing the bearing to rotate precisely and smoothly. An object of the present invention is to provide a rolling bearing which can be manufactured.

[0006]

The first of the rolling bearings having a flexible portion at the contact portion with the roller according to the present invention is that the contact portion with the outer ring or the inner ring or both the inner and outer rings is on the plane orthogonal to the axis. Has a flexible portion that elastically supports the roller formed by the annular recessed portion. Then, the elasticity of the flexible portion allows the roller to retain a necessary preload holding force, and the flexible portion absorbs and relaxes thermal strain or shock microscopic strain due to heat generation, so that the bearing is always in a zero backlash state. Rotate the machine precisely and smoothly.

The second rolling bearing having a flexible portion at the contact portion with the roller according to the present invention is formed at the contact portion with the outer ring or inner ring, or both the inner and outer ring rollers, by an annular recess on the plane orthogonal to the axis. It has a flexible part. Then, at the time of final processing of the contact portion, the left and right sides of the contact portion are processed while being held in a slightly opened state against the flexible portion, and after the bearing is assembled, the restoring force acts on the roller as a preload. .

A third aspect of the rolling bearing according to the present invention, which has a flexible portion at the contact portion with the roller, is a roller bearing that is formed by an annular recess on the plane orthogonal to the axis at the contact portion with the roller of the inner ring or outer ring. It has a flexible portion for supporting spontaneously. The flexible portion has a hydraulic chamber which opens on the side surface thereof toward the flexible portion and is in pressure contact with an annular presser which is fastened to the inner ring or the outer ring on a plane orthogonal to the axis. Then, by pressurizing the hydraulic chamber, a preload corresponding to a strong axial load is applied to the contact portion to rotate the bearing precisely and smoothly with zero backlash.

According to the fourth aspect of the rolling bearing of the present invention, which has a flexible portion at the contact portion with the roller, deep roller grooves are formed in the inner ring and the outer ring. The contact portion of the inner ring or the outer ring with the roller has a flexible portion which is elastically supported by the annular recess formed on the plane orthogonal to the axis. The flexible part is divided from the body of the inner ring or the outer ring, and the flexible part has a hydraulic chamber on its side surface that opens toward the flexible part and is fastened to the main body.
Press contact with the annular presser on the plane orthogonal to the axis. Then, the number of rollers can be increased corresponding to the depth of the roller groove.

In the fourth case, the roller groove is deepened by inserting a roller holder having a semicircular notch into which the roller is inserted radially on the inner periphery of the annular plate member on the plane orthogonal to the axis. And may allow the number of rollers to be increased.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the first aspect of the present invention, the flexible portion of the contact portion (pressure receiving portion) of the roller is formed by an annular recess provided on the outer ring on the plane orthogonal to the axis. You may provide this flexible part in an inner ring. Further, it may be provided on both the inner and outer rings.

The flexible portion is bent to pre-load the roller while the roller is accommodated in the roller groove of the inner and outer rings. Even if the bearing is slightly deformed due to an increase in shaft load or heat generation, the flexible part keeps zero backlash in response to this deformation, and the bearing supports the shaft supported by it precisely and smoothly. Rotate to.

According to the second aspect of the present invention, at the time of final processing of the contact portion, the left and right sides of the contact portion are slightly opened against the flexible portion while being processed. Preload the roller.

According to the third aspect of the invention, a load means for the flexible portion is provided. This load means is almost the same as that shown in Japanese Utility Model Publication No. 7-30242 filed previously by the applicant of the present application. When the preload of the flexible portion alone cannot deal with the fluctuation of the axial load, the flexible portion is hydraulically loaded to compensate for the shortage.

The fourth invention is a technique for dealing with the case where the depth of the groove of the roller of the inner ring or the outer ring is large, and the flexible portion is divided from the body of the inner ring or the outer ring.

The fifth aspect of the invention is a technical addition to the fourth aspect of the invention, in which the roller groove is deepened by adopting a roller holder having semicircular cuts radially formed on the inner circumference of an annular plate material. However, the roller holder can be housed in the annular recess.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description, the same reference numerals indicate the same or corresponding parts. Also, an example in which the flexible portion 9 is provided for the outer ring 2 will be described, or it may be provided for the inner ring 1.

In FIG. 1, 1 is an inner ring, 2 is an outer ring, and 3 is a roller. Reference numerals 4 and 5 denote contact portions between the inner ring 1 and the roller 3 of the outer ring 2, and reference numerals 6 and 7 denote roller grooves provided in the contact portions 4 and 5, respectively. One of the contact portions 4 and 5 has a flexible portion 9 formed by an annular recess 8 on a plane perpendicular to the axis, following the roller groove 7, and the flexible portion 9 repels the roller 3. Support spontaneously. An annular groove 8'may be formed on the side surface of the outer ring 2 so as to face the annular recess 8 so as to easily obtain the elastic force of the flexible portion 9.

This bearing responds to thermal strain due to heat generation in the shaft support portion 10 due to this elastic force and minute deformation due to an increase in shaft load, and the bearing always rotates precisely and smoothly with zero backlash.

FIG. 2 shows an example in which a load means for the flexible portion 9 is provided. The flexible portion 9 is in pressure contact with the annular retainer 11 on a plane orthogonal to the axis. The annular retainer 11 has a hydraulic chamber 12 on its side surface that opens toward the flexible portion 9 side, and is screwed directly to the side surface of the outer ring 2 in the illustrated example.

The annular presser 11 may be attached to the outer ring with a mounting screw. The hydraulic chamber 12 communicates with a hydraulic pressure supply source via a hydraulic port 13, and a hydraulic seal 14 is provided on an opening surface of the flexible portion 9.

In this case, by pressurizing the hydraulic chamber 12, a preload corresponding to a strong axial load is applied to the contact portions 4 and 5 to rotate the bearing precisely and smoothly with zero backlash.

FIG. 3 shows a corresponding technique in the case of having the deep roller grooves 6 and 7. The flexible portion 9 is divided from the main body 2'of the outer ring 2. In the illustrated example, the flexible portion 9 projects from the center of the inner peripheral surface of the ring 15 toward the center, and the ring 15 is attached to the main body 2 '.
The annular recessed portion 8 is formed by accommodating the recessed portion 16 on the side surface.

Generally, when the roller grooves 6 and 7 are deep and a large number of rollers 3 are used, the roller 3 cannot be inserted into the roller grooves 6 and 7. In this example, since the flexible portion 9 can also be removed from the outer ring 2 by removing the annular presser 11 from the outer ring 2, more rollers 3 are inserted into the roller grooves 6 and 7, and the roller grooves 6 and 7 are inserted.
Can be inserted until it comes into close contact with.

In the figure, the rollers 3 are radially arranged on the inner circumference of the annular plate member.
A roller holder 18 provided with a semicircular cutout 17 into which a hole is inserted is prepared. In this way, even if the roller grooves 6 and 7 are deep, the roller holder 18 can be inserted into the annular recess 8 and the roller 3 can be stabilized.

[0026]

According to the first aspect of the present invention, since the rollers are kept under preload, the bearing function can always be fulfilled in the state of zero backlash against slight deformation of the bearing due to fluctuation of axial load or heat generation. You can

According to the second aspect of the invention, the roller can be preloaded at the time of assembling the bearing.

According to the third aspect of the present invention, a large preload can be forcibly applied to the contact portion via the load means, and accordingly, a larger deformation of the bearing can be sufficiently accommodated.

According to the invention of claim 4, the flexible portion is divided into the inner ring or the outer ring, and a large preload is forcibly applied to the flexible portion via the load means. However, many rollers can be inserted and good contact with the roller groove can be maintained.

According to the fifth aspect of the invention, even if the roller groove is deep, the roller holder can be inserted into the annular recess, and the roller can be prevented from coming out.

[Brief description of drawings]

FIG. 1 is a partially cut side view showing a specific example of a first example according to the present invention.

FIG. 2 is a partially cut side view showing a specific example of a second example according to the present invention.

FIG. 3 is a partially cut side view showing a specific example of third and fourth examples according to the present invention.

FIG. 4 is a front view of a roller holder.

FIG. 5 is a cutaway side view of the same portion.

FIG. 6 is a partially cut side view of the side where the bearing of the present invention is used for supporting a spindle of a lathe.

FIG. 7 is a partially cut side view of the side where the bearing of the present invention is used in a slice cutter.

FIG. 8 is a partially cut side view of a conventional bearing.

[Explanation of symbols]

 1 Inner ring 2 Outer ring 2'Main body 3 Roller 4 Contact part 5 Contact part 6 Roller groove 7 Roller groove 8 Annular recess 9 Flexible part 10 Shaft supporting part 11 Annular retainer 12 Hydraulic chamber 13 Hydraulic port 14 Hydraulic seal 15 Ring 16 Recess 17 Annular presser 18 Semi-circular notch

Claims (5)

[Claims] Claims: 1. The outer ring (2) or inner ring (1), or both inner and outer ring roller (3) contact portion (4,5), the roller formed by an annular recess (8) on the plane orthogonal to the axis Flexible part that elastically supports (3)
(9), and the elastic force of the flexible portion (9) allows the roller (3) to retain the necessary preload holding force, so that the flexible portion (9) is free from thermal strain due to heat generation or shock microscopic strain. A rolling bearing having a flexible portion at the contact portion with the roller, which is characterized by absorbing and relaxing by means of which the bearing can be rotated precisely and smoothly with zero backlash. 2. A flexible member formed by an annular recess (8) on a plane orthogonal to an axis at a contact portion (4,5) of the outer ring (2), the inner ring (1), or both inner and outer ring rollers (3). After the bearing is assembled, it has a part (9), and at the time of final processing of the contact part (4,5), the left and right sides of the contact part are slightly opened against the flexible part (9). A rolling bearing having a flexible portion at a contact portion with a roller, characterized in that the restoring force acts on the roller (3) as a preload. 3. The inner ring (1) or the outer ring (2) is contacted with a roller (3) at a contact portion (4,5), and the roller (3) formed by an annular recess (8) on a plane orthogonal to the axis is repelled. The flexible portion (9) for supporting spontaneously, the flexible portion (9) has a hydraulic chamber (12) opening toward the flexible portion (9) side on its side surface, and The annular chamber (11), which is fastened to the inner ring (1) or the outer ring (2), comes into pressure contact with the annular presser (11) on a plane orthogonal to the hydraulic chamber (12).
It is possible to apply a preload corresponding to a strong axial load to the contact parts (4,5) by pressurizing the bearing to rotate the bearing precisely and smoothly with zero backlash, which is suitable for the contact part with the roller. Rolling bearing having a flexible portion. 4. A deep roller (6, 7) groove is formed in the inner ring (1) and the outer ring (2), and a contact portion (4,5) of the inner ring (1) or the outer ring (2) with the roller (3). ) Has a flexible part (9) elastically supporting the roller (3) formed by the annular recess (8) on the plane orthogonal to the axis, and the flexible part (9) is the inner ring (1). Or it is divided from the outer ring (2) body (1 ', 2'),
The flexible part (9) has a hydraulic chamber (12) opening toward the side of the flexible part (9) and is fastened to the main body (1 ′, 2 ′). Press-contact with the presser foot (11) on the plane orthogonal to the axis,
A rolling bearing having a flexible portion at a contact portion with the roller, which is capable of increasing the number of rollers (3) corresponding to the depth of 7). 5. A roller holder (18) comprising a semicircular cut into which a roller (3) is inserted radially on the inner periphery of an annular plate member, and is inserted into the annular recess (8) on the plane orthogonal to the axis. Due to the roller groove (6,
The rolling bearing according to claim 4, which has a flexible portion at a contact portion with the roller, which is capable of increasing the depth of 7) and increasing the number of rollers (3).