JP2007263350A - Bearing device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of restraining displacement of central axial lines of a small-diameter sleeve and a large-diameter sleeve constituting a sleeve, and a manufacturing method thereof. <P>SOLUTION: This device comprises a rolling bearing 31 assembled on an axis of an inner shaft 15 via a sleeve 40 and having inner/outer rings 32, 34 and a plurality of rolling elements 36, and an annular body bracket 21 capable of holding the outer ring 34 on an inner peripheral side and being pressure-fitted in an inner hole of an outer tube 10 on an outer peripheral side, and assembled with an outer elastic body 25 having elasticity. The sleeve 40 integrally has a small-diameter sleeve 41, a large-diameter sleeve 51, and an intermediate elastic element 42 installed in an annular space part between them and having elasticity. The large-diameter sleeve 51 is formed by cutting an outer periphery of a sleeve material 50 into an outside diameter dimension corresponding to a central hole of the inner ring 32 after the sleeve material 50 is reduced by drawing, and the intermediate elastic element 42 is compressed by a predetermined volume by drawing the sleeve material 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bearing device that rotatably and elastically supports an inner shaft in an inner hole of an outer tube, and a manufacturing method thereof.

For example, the inner shaft that connects the output shaft of the in-vehicle engine and the input shaft of the transaxle to the inner hole of an outer tube such as a torque tube so as to be able to transmit torque is rotatably and elastically supported. In the bearing device, a rolling bearing having a plurality of rolling elements which are assembled on the inner shaft via a sleeve and disposed between the inner and outer rings and the inner and outer rings, and the outer ring on the inner peripheral side. An annular body bracket that is held and is provided with an outer elastic body that can be press-fitted into the inner hole of the outer tube and has elasticity on the outer peripheral side is known.
The sleeve is provided in a small-diameter sleeve inserted into the outer periphery of the inner shaft, a large-diameter sleeve fitted into the inner hole of the inner ring, and an annular space between the small-diameter sleeve and the large-diameter sleeve, and is elastic. And an intermediate elastic body having an integrated structure.
For example, Patent Document 1 discloses a bearing device that rotatably and elastically supports an inner shaft in an inner hole of an outer tube.
Japanese Utility Model Publication No. 4-128918

By the way, in the bearing device having the above-described structure, if an intermediate elastic body having elasticity is provided in the annular space between the small diameter sleeve and the large diameter sleeve, the mutual center axis of the small diameter sleeve and the large diameter sleeve Becomes easy to shift.
Then, the roundness of the raceway surface of the inner ring is deteriorated with respect to the center axis of the inner shaft, which may cause abnormal noise and vibration (NVH).

  In view of the above problems, an object of the present invention is to provide a bearing device and a method for manufacturing the same that can prevent the mutual displacement of the central axes of the small diameter sleeve and the large diameter sleeve constituting the sleeve. is there.

In order to achieve the above object, a bearing device according to claim 1 of the present invention is a bearing device that rotatably and elastically supports an inner shaft in an inner hole of an outer tube,
A rolling bearing having a plurality of rolling elements which are assembled on the shaft of the inner shaft via a sleeve and disposed between the inner and outer rings and the inner and outer rings; and an outer periphery which holds the outer ring on the inner peripheral side An annular body bracket that is fitted with an outer elastic body that can be press-fitted into the inner hole of the outer tube and has elasticity on the side;
The sleeve is provided in an annular space between the small diameter sleeve inserted into the outer periphery of the inner shaft, a large diameter sleeve inserted into the inner hole of the inner ring, and the small diameter sleeve and the large diameter sleeve, And an intermediate elastic body having elasticity, and
The large-diameter sleeve is formed by cutting the outer peripheral surface of the sleeve material into an outer diameter corresponding to the center hole of the inner ring after the sleeve material is reduced by drawing.
The intermediate elastic body is compressed by a predetermined amount by drawing the sleeve material.

According to the above configuration, after the sleeve material corresponding to the large diameter sleeve constituting the sleeve is reduced by drawing, the outer peripheral surface of the sleeve material is cut to the outer diameter corresponding to the center hole of the inner ring, and the large diameter sleeve is formed. Therefore, the center axis of the outer peripheral surface of the large-diameter sleeve is precisely matched to the center axis of the inner hole of the small-diameter sleeve, so that the center axis of these mutual axes is prevented from being displaced. be able to.
In addition, since the intermediate elastic body is compressed by a predetermined amount by the drawing process of the sleeve material, it is possible to reduce the adverse effect on the processing accuracy due to the elastic deformation of the intermediate elastic body unexpectedly during the cutting process. It becomes easy to cut the outer peripheral surface of the material with high accuracy.
As described above, the center axis of the small diameter sleeve and the large diameter sleeve can be prevented from being displaced. As a result, in a state where the bearing device is assembled to the inner shaft, the small diameter sleeve, the large diameter sleeve, It is possible to suppress the displacement of the central axes of the inner and outer rings of the rolling bearing. As a result, it is possible to prevent the generation of abnormal noise and vibration (NVH) caused by the displacement of the central axis.
Furthermore, it is possible to reduce the occurrence of unexpected gaps between the raceway surface, raceway surface and rolling elements, and to improve the durability by preventing uneven wear and damage of the raceway surface, raceway surface and rolling elements. Can be achieved.

According to a second aspect of the present invention, there is provided a bearing device manufacturing method in which an inner shaft is rotatably and elastically supported in an inner hole of an outer tube, and the inner and outer rings are assembled on a shaft of the inner shaft via a sleeve. And a rolling bearing having a plurality of rolling elements disposed between the inner and outer rings, and holding the outer ring on the inner peripheral side and press-fitting into the inner hole of the outer tube on the outer peripheral side, and having elasticity An annular body bracket assembled with an outer elastic body, and the sleeve includes a small-diameter sleeve fitted into an outer periphery of the inner shaft, a large-diameter sleeve fitted into an inner hole of the inner ring, and the small-diameter sleeve; A manufacturing method for manufacturing a bearing device integrally provided with an intermediate elastic body provided in an annular space between the large diameter sleeve and having elasticity,
Preparing the small diameter sleeve and a sleeve material for forming the large diameter sleeve;
An elastic body forming step of filling the annular space between the small diameter sleeve and the sleeve material with an elastic material to form an intermediate elastic body;
A drawing step of reducing the sleeve material by a predetermined amount by drawing and compressing the intermediate elastic body by a predetermined amount;
And a cutting step of cutting the outer peripheral surface of the sleeve material into an outer diameter corresponding to the center hole of the inner ring by cutting to form a large-diameter sleeve.

  According to the said structure, the bearing apparatus of Claim 1 can be easily manufactured by providing an elastic body formation process, a drawing process, and a cutting process.

A bearing device manufacturing method according to claim 3 is the bearing device manufacturing method according to claim 2,
In the cutting process, forming a large-diameter sleeve having a collar at one end of the outer peripheral surface of the sleeve material,
Thereafter, the other end portion of the large diameter sleeve is inserted into the inner ring by caulking under a state where the large diameter sleeve is fitted into the center hole of the inner ring and the collar portion is in contact with one end surface of the inner ring. An assembling step for integrally joining the large-diameter sleeve and the inner ring is provided by plastically deforming radially outward toward the other end surface to form a caulking portion.

  According to the said structure, a large diameter sleeve and an inner ring | wheel can be easily combined and assembled | attached by an assembly process.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

A first embodiment of the present invention will be described with reference to FIGS.
1 is a schematic view showing a state in which a bearing device according to Embodiment 1 of the present invention is disposed between an outer tube and an inner shaft. FIG. 2 is a side sectional view showing a state in which the bearing device is disposed between the outer tube and the inner shaft. FIG. 3 is an enlarged half-sectional view of the bearing device.
As shown in FIGS. 1 and 2, the bearing device 20 according to the first embodiment is configured to connect the output shaft of the in-vehicle engine 1 mounted on the vehicle body side and the input shaft of the transaxle 5 so that torque can be transmitted. The inner shaft 15 is configured to be rotatably and elastically supported in the inner hole of the outer tube (torque tube) 10.

As shown in FIGS. 2 and 3, the bearing device 20 includes a main body bracket 21, an outer elastic body 24, a deep groove ball bearing 31 as a rolling bearing, and a sleeve 40.
The deep groove ball bearing 31 assembled on the inner shaft 15 via the sleeve 40 has an inner ring 32 having a raceway surface 33 formed on the outer peripheral surface and a raceway surface 35 corresponding to the raceway surface 33 formed on the inner peripheral surface. The outer ring 34 and a plurality of balls 36 as rolling elements that are held at predetermined intervals by a holder 37 between the raceway surfaces 33 and 35. Further, seal members 38 are incorporated at both ends between the inner ring 32 and the outer ring 34 as necessary.

The main body bracket 21 is formed by joining two bracket plates 22 each having an annular shape with a hat-shaped cross section, and a plurality of rivets 23 connected to each other in the center in the radial direction. A holding groove 24 is formed on the outer peripheral side of the main body bracket 21 and is fitted with an elastic outer elastic body 25 that can be press-fitted into the inner hole of the outer tube 10. A bearing holding groove 27 is formed to hold the pin.
In the first embodiment, the outer elastic body 25 is formed in an annular shape by an elastic material such as soft resin or rubber and is assembled in the holding groove 24. Further, the outer elastic body 25 is formed with a thin end at both ends, and a thick protruding portion 26 having a trapezoidal cross section is formed at the center. And the outer side elastic body 25 is press-fitted in the inner hole of the outer tube 10 in the protruding item | line part 26, and is elastically compressed.

As shown in FIG. 3, the sleeve 40 integrally includes a small diameter sleeve 41, a large diameter sleeve 51, and an intermediate elastic body 42, and the small diameter sleeve 41 is press-fitted into the outer peripheral surface of the inner shaft 15, serrated, Inserted by spline fitting or the like, both ends thereof are fixed on the shaft of the inner shaft 15 by retaining rings 45.
The large-diameter sleeve 51 is formed to have an outer diameter that is press-fitted into the inner hole of the inner ring 32, and a flange portion 52 that is in contact with one end surface of the inner ring 32 is formed on one outer peripheral surface of the inner ring 32. In this, a caulking portion 55 that is plastically deformed radially outward toward the other end surface of the inner ring 32 is formed by caulking, whereby the large-diameter sleeve 51 and the inner ring 32 are integrally coupled. Yes.

The intermediate elastic body 42 is formed of an elastic material and provided in an annular space between the small diameter sleeve 41 and the large diameter sleeve 51.
In the first embodiment, the intermediate elastic body 42 is filled with a vulcanized rubber material having fluidity in an annular space, and then heated in a vulcanization chamber at a predetermined temperature for a predetermined time, whereby the intermediate elastic body 42 has rubber elasticity. At the same time, the inner peripheral surface of the intermediate elastic body 42 is firmly bonded to the outer peripheral surface of the small diameter sleeve 41 and the outer peripheral surface of the intermediate elastic body 42 is firmly bonded to the inner peripheral surface of the large diameter sleeve 51 by vulcanization bonding. It has become so.

  As shown in FIGS. 4 to 6, the large-diameter sleeve 51 is configured such that after the outer diameter D1 of the sleeve material 50 is reduced to the outer diameter D2 by drawing, the outer circumference of the sleeve material 50 is reduced. The surface is formed by cutting to an outer diameter D3 corresponding to the center hole of the inner ring 32. The intermediate elastic body 42 is compressed by a predetermined amount by drawing the sleeve material 50.

In the bearing device according to the first embodiment configured as described above, after the sleeve material 50 corresponding to the large diameter sleeve 51 constituting the sleeve 40 is reduced by drawing, the outer peripheral surface of the sleeve material 50 is the inner ring 32. The large-diameter sleeve 51 is formed by cutting into an outer diameter corresponding to the center hole.
For this reason, the center axis line of the outer peripheral surface of the large diameter sleeve 51 can be precisely matched with the center axis line of the inner hole of the small diameter sleeve 41 for cutting. As a result, it is possible to suppress displacement of the center axes of the small diameter sleeve 41 and the large diameter sleeve 51 from each other.

Further, since the intermediate elastic body 42 is compressed by a predetermined amount by the drawing of the sleeve material 50, the intermediate elastic body 42 is unexpectedly elastically deformed during the cutting process, thereby reducing adverse effects on processing accuracy. This makes it easy to cut the outer peripheral surface of the sleeve material 50 with high accuracy.
As a result, in a state where the bearing device is assembled to the inner shaft 15, it is possible to suppress the displacement of the central axes of the small diameter sleeve 41, the large diameter sleeve 51, the inner ring 32 and the outer ring 34 of the deep groove ball bearing 31. The generation of abnormal noise and vibration (NVH) caused by the positional displacement of can be prevented.
Furthermore, it is possible to reduce the occurrence of unexpected gaps between the raceway surfaces 33 and 35 and the ball 36, and to prevent uneven wear and damage of the raceway surfaces 33 and 35 and the ball 36, thereby improving durability. Can be improved.

Next, a method for manufacturing the bearing device 20 according to the first embodiment will be described with reference to FIGS.
FIG. 4 is a cross-sectional view showing a state where an annular space between a small diameter sleeve and a sleeve material corresponding to the large diameter sleeve is filled with a vulcanized rubber material. FIG. 5 is a sectional view showing a state in which the sleeve material is reduced by a predetermined amount by drawing after the annular space between the small diameter sleeve and the sleeve material is filled with the vulcanized rubber material. FIG. 6 is a cross-sectional view showing a state in which a large diameter sleeve is formed by cutting the outer peripheral surface of the sleeve material.
The manufacturing method of Example 1 includes an elastic body forming process, a drawing process, a cutting process, and an assembling process in this order.

First, before the elastic body forming step, a small diameter sleeve 41 and a sleeve material 50 for forming the large diameter sleeve 51 are prepared in advance.
Then, in the elastic body forming process, the small diameter sleeve 41 and the sleeve material 50 are positioned on the same central axis and set in a molding die (not shown), and as shown in FIG. The annular space between the material 50 is filled with a vulcanized rubber material having fluidity.
Thereafter, the small-diameter sleeve 41 and the sleeve material 50 are taken out from the mold and heated at a predetermined temperature for a predetermined time in the vulcanizing chamber to crosslink the vulcanized rubber material, thereby forming an intermediate elastic body 42 having rubber elasticity. To do. At this time, the inner peripheral surface of the intermediate elastic body 42 is firmly bonded to the outer peripheral surface of the small diameter sleeve 41 and the outer peripheral surface of the intermediate elastic body 42 is firmly bonded to the inner peripheral surface of the sleeve material 50 by vulcanization bonding.

Thereafter, in the drawing process, as shown in FIG. 5, the outer diameter dimension D1 of the sleeve material 50 is reduced to the outer diameter dimension D2 by drawing, thereby elastically compressing the intermediate elastic body 42 by a predetermined amount.
Then, in the cutting step, the outer peripheral surface of the sleeve material 50 is cut to the portion of the cutting line L indicated by the broken line in FIG. 5, thereby making the outer peripheral surface of the sleeve material 50 the center hole of the inner ring 32 as shown in FIG. 6. The outer diameter dimension D3 corresponding to the above is cut, thereby forming the large diameter sleeve 51.
Further, in the cutting process, the flange portion 52 is formed on the portion of the sleeve material 50, leaving one end portion of the outer peripheral surface without being cut.

  Thereafter, in the assembling process, the large diameter sleeve 51 is inserted into the center hole of the inner ring 32 and the collar portion 52 is brought into contact with one end surface of the inner ring 32. The large diameter sleeve 51 and the inner ring 32 are integrally coupled by forming the caulking portion 55 by plastically deforming the end portion toward the other end surface of the inner ring 32 radially outward. Thereby, the bearing device 20 is manufactured.

As described above, the bearing device 20 according to the first embodiment can be easily manufactured by sequentially performing the elastic body forming process, the drawing process, the cutting process, and the assembling process.
The large-diameter sleeve 51 and the inner ring 32 are joined together, and then both bracket plates 22 of the body bracket 21 are joined together by a plurality of rivets 23 to form the body bracket 21 and at the same time hold the bearing. An outer ring 34 can be incorporated in the groove 27.
Further, as described above, after the outer ring 34 is assembled in the bearing holding groove 27 of the main body bracket 21, the large diameter sleeve 51 and the inner ring 32 can be integrally coupled.

The present invention is not limited to the first embodiment.
For example, in the first embodiment, the inner shaft 15 for connecting the output shaft of the in-vehicle engine 1 and the input shaft of the transaxle 5 so as to be able to transmit torque is rotatably and elastically connected to the inner hole of the outer tube 10. Although the case of the bearing device 20 to be supported has been exemplified, the bearing device of the present invention can be employed in a portion that rotatably and elastically supports the inner shaft in the inner hole of the outer tube.
In the first embodiment, the case where the deep groove ball bearing 31 is employed as the rolling bearing is exemplified. However, even when a rolling bearing such as a single row or double row tapered roller bearing or a cylindrical roller bearing is employed, The invention can be implemented.

It is the schematic which shows the state by which the bearing apparatus which concerns on Example 1 of this invention has been arrange | positioned between an outer tube and an inner shaft. Similarly, it is a sectional side view showing a state in which the bearing device is disposed between the outer tube and the inner shaft. It is a half sectional view which expands and shows a bearing device similarly. It is sectional drawing which shows the state by which the annular space part similarly between the small diameter sleeve and the sleeve raw material corresponding to a large diameter sleeve was filled with the vulcanized rubber material. Similarly, after the vulcanized rubber material is filled in the annular space between the small-diameter sleeve and the sleeve material, the sleeve material is reduced by a predetermined amount by drawing. It is sectional drawing which similarly shows the state by which the outer peripheral surface of the sleeve raw material was cut and the large diameter sleeve was formed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer tube 15 Inner shaft 20 Bearing apparatus 21 Main body bracket 24 Holding groove 25 Outer elastic body 31 Deep groove ball bearing (rolling bearing)
32 Inner ring 33 Raceway surface 34 Outer ring 35 Raceway surface 36 Ball (rolling element)
40 Sleeve 41 Small-diameter sleeve 42 Intermediate elastic body 50 Sleeve material 51 Large-diameter sleeve

Claims (3)

A bearing device that rotatably and elastically supports an inner shaft in an inner hole of an outer tube,
A rolling bearing having a plurality of rolling elements which are assembled on the shaft of the inner shaft via a sleeve and disposed between the inner and outer rings and the inner and outer rings; and an outer periphery which holds the outer ring on the inner peripheral side An annular body bracket that is fitted with an outer elastic body that can be press-fitted into the inner hole of the outer tube and has elasticity on the side;
The sleeve is provided in an annular space between the small diameter sleeve inserted into the outer periphery of the inner shaft, a large diameter sleeve inserted into the inner hole of the inner ring, and the small diameter sleeve and the large diameter sleeve, And an intermediate elastic body having elasticity, and
The large-diameter sleeve is formed by cutting the outer peripheral surface of the sleeve material into an outer diameter corresponding to the center hole of the inner ring after the sleeve material is reduced by drawing.
The intermediate elastic body is compressed by a predetermined amount by drawing the sleeve material. In order to rotatably and elastically support the inner shaft in the inner hole of the outer tube, the inner shaft is assembled on the shaft of the inner shaft via a sleeve and disposed between the inner and outer rings and the inner and outer rings. A rolling bearing having a plurality of rolling elements, and an annular main body bracket that is assembled with an outer elastic body that holds the outer ring on the inner peripheral side and can be press-fitted into the inner hole of the outer tube on the outer peripheral side and has elasticity. The sleeve includes a small-diameter sleeve that is fitted on the outer periphery of the inner shaft, a large-diameter sleeve that is fitted into the inner hole of the inner ring, and an annular space between the small-diameter sleeve and the large-diameter sleeve. A manufacturing method for manufacturing a bearing device provided integrally with an intermediate elastic body provided with elasticity,
Preparing the small diameter sleeve and a sleeve material for forming the large diameter sleeve;
An elastic body forming step of filling the annular space between the small diameter sleeve and the sleeve material with an elastic material to form an intermediate elastic body;
A drawing step of reducing the sleeve material by a predetermined amount by drawing and compressing the intermediate elastic body by a predetermined amount;
And a cutting step of cutting the outer peripheral surface of the sleeve material into an outer diameter corresponding to the center hole of the inner ring by cutting to form a large-diameter sleeve. It is a manufacturing method of the bearing device according to claim 2,
In the cutting process, forming a large-diameter sleeve having a collar at one end of the outer peripheral surface of the sleeve material,
Thereafter, the other end portion of the large diameter sleeve is inserted into the inner ring by caulking under a state where the large diameter sleeve is fitted into the center hole of the inner ring and the collar portion is in contact with one end surface of the inner ring. A bearing device comprising an assembling step for integrally joining the large-diameter sleeve and the inner ring by plastically deforming radially outward toward the other end surface of the sleeve to form a caulking portion. Manufacturing method.

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