JP2005233299A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress or prevent the generation of vibration and noise by damping vibration received from one ring side of an outer ring 2 and an inner ring 3 without changing outer dimensions of a roller bearing 1. <P>SOLUTION: In the roller bearing, the outside diameter corner part of an outer ring 2 and the inside diameter corner part of an inner ring 3 are eliminated. Damping members 6, 7 are mounted so as to be matched and fitted to the eliminated parts. The outer dimensions of assemblies in which the damping member 6 is mounted in the outer ring 2 and the damping member 7 is mounted in the inner ring 3, are made substantially identical to general ready-made outer rings and inner rings. A mounting space of a roller bearing 1 is utilized without change. The roller bearing 1 can also secure the load capacity substantially equal to general ready-made products. When vibrations are given to the outer ring 2 and the inner ring 3, for example, the damping members 6, 7 effectively damp the vibrations, thereby suppressing or preventing transmission of the vibration between the outer ring 2 and the inner ring 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rolling bearing.

For example, in various mechanical devices in which a rotating shaft is rotatably supported by a rolling bearing, vibration may be transmitted from the inner ring of the rolling bearing to the outer ring or from the outer ring to the inner ring. On the other hand, conventionally, the vibration transmission between the outer ring and the case can be blocked by attaching a damping member such as a sheet-like low-elasticity body or a damping steel plate to substantially the entire outer peripheral surface of the outer ring. It is considered (for example, refer to Patent Documents 1 and 2).
JP 2000-110844 A Utility Kaihei 5-12746

  When using the above damping member, reduce the outer diameter of the rolling bearing by the thickness of the damping member without changing the inner diameter of the case, or change the inner diameter of the case without changing the outer dimension of the rolling bearing. It is necessary to increase the dimension by the thickness of the damping member.

  In general, it is difficult to change the outer dimensions and specifications of the case and the rotating shaft that are the main body of the mechanical device, and the cost is greatly increased. Therefore, the installation space for the vibration damping member and the rolling bearing cannot be changed. Therefore, it is common to take measures to reduce the outer dimensions of the rolling bearing, but in that case, the load resistance of the rolling bearing may be reduced. Considering this point, if the thickness of the damping member is made as thin as possible, the damping effect is reduced and the damping member may be easily damaged.

  The present invention provides a rolling bearing in which a plurality of rolling elements are interposed between an outer ring and an inner ring, and a damping member is provided on a part of a fixed peripheral surface and a fixed end surface of at least one of the outer ring and the inner ring. The vibration control member has a surface that is substantially flush with the fixed peripheral surface and the fixed end surface of the one wheel, and the assembly of the vibration control member and the one wheel is the outer ring or the inner ring. It is characterized by that.

  The vibration damping member includes a member attached to one or both of the outer ring and the inner ring. The rolling elements include balls or rollers (cylindrical rollers, tapered rollers, spherical rollers). The present invention is not particularly limited to the type of rolling bearing, and can also be applied to various ball bearing types and various roller bearing types. Although the specific example is mentioned in the description column of embodiment, the said damping member will not be specifically limited if it has vibration damping property. The fixed peripheral surface and the fixed end surface are surfaces that come into contact with a mating partner of at least one of the outer ring and the inner ring.

  In this case, when vibration is applied to one of the outer ring and the inner ring, the damping member effectively attenuates (or absorbs) the vibration energy, and from one wheel side of the outer ring and the inner ring. The transmission of vibration to the other wheel side is suppressed or prevented. In addition, since the damping member is provided with a surface that is substantially flush with the fixed peripheral surface and the fixed end surface of the outer ring or inner ring, an assembly in which the damping member is attached to a part of the outer ring or the inner ring can be used, for example, The outer dimensions can be substantially the same as those of the ready-made outer ring and the ready-made inner ring. As a result, the installation location of the rolling bearing of the present invention is excellent in versatility, such as no need to change the existing installation space, and it is not necessary to change the PCD of the rolling bearing. Will not drop. In addition, the assembly in which the damping member is attached to a part of the outer ring or inner ring has a fixed circumferential surface or fixed end surface of the outer ring or inner ring and the damping member abut against a mating counterpart such as a case or a shaft. The rigidity of the entire ring and bearing is ensured. Note that the ready-made outer ring and ready-made inner ring are an outer ring and an inner ring provided in a rolling bearing having an outer shape such as a nominal number defined in JIS standards or a model number defined in each manufacturer's standard.

  The said damping member can be attached to the corner | angular part ranging from the fixed peripheral surface of the said one wheel to a fixed end surface. In this case, the volume of the damping member can be increased without reducing the strength of the one wheel, and a sufficient damping effect can be obtained.

  The slanted contact type is such that the rolling elements are obliquely contacted with the outer ring and the inner ring, and the damping member is provided at a corner portion extending from the fixed peripheral surface to the fixed end surface on the thick portion side of at least one of the outer ring and the inner ring. Can do. Examples of the oblique contact type rolling bearing include a tapered roller bearing and an angular ball bearing.

  According to the present invention, vibration input from one of the outer ring and the inner ring can be effectively attenuated, and vibration transmission between the outer ring and the inner ring can be suppressed or prevented. In addition, if the assembly with the damping member attached to a part of the outer ring or inner ring has the same outer dimensions as, for example, a typical ready-made outer ring or a ready-made inner ring, the outer dimensions of the rolling bearing should be the same as that of the ready-made bearing. Can do.

  The best mode of the present invention will be described with reference to the drawings. 1 is a cross-sectional view showing the upper half of the rolling bearing, FIG. 2 is an exploded view of the rolling bearing of FIG. 1, and FIG. 3 is a diagram showing an example of use of the rolling bearing of FIG. The illustrated rolling bearing 1 is a tapered roller bearing, and includes an outer ring 2, an inner ring 3, a tapered roller 4, and a cage 5. Damping members 6 and 7 are attached to the outer ring 2 and the inner ring 3. Yes.

  The outer ring 2 is shaped like a hollow truncated cone by cutting off the outer diameter side corner of the thick-walled part of the ready-made outer ring. Further, the inner ring 3 is shaped like a hollow truncated cone by notching the inner diameter side corner of the thick wall portion of the ready-made inner ring. The ready-made outer ring or ready-made inner ring is an outer ring or an inner ring provided in a rolling bearing having an outer shape such as a nominal number defined in JIS standards or a model number defined in each manufacturer's standard.

  Then, by attaching the large-diameter damping member 6 to the notch region of the outer ring 2 in a non-separable manner, the outer shape of the assembly of the outer ring 2 and the damping member 6 is made substantially the same as the ready-made outer ring, Since the outer shape of the assembly of the inner ring 3 and the damping member 7 is made substantially the same as that of the ready-made inner ring by attaching the damping member 7 having a small diameter to the notch region 3 in a non-separable manner, the details will be described below. explain.

  The outer ring 2 has an inner peripheral slope that is a raceway surface 2a of the tapered roller 4, and raised portions 2c and 2d that protrude outward in the radial direction are provided on the large end side and the small end side of the outer peripheral slope 2b. ing. A region where the tapered roller 4 is in rolling contact with the raceway surface 2a of the outer ring 2 (effective raceway region) is set to a substantially uniform thickness. The large-diameter damping member 6 has a triangular cross-section in the upper half, and three corners are chamfered. Note that the chamfers of the three corners of the damping member 6 are all R-shaped or flat. When the chamfer is R-shaped, it can be easily attached to the fixing member.

  The inner ring 3 has an outer peripheral inclined surface as a raceway surface 3a of the tapered roller 4, and a large flange 3b extending radially outward on the large end side of the raceway surface 3a is also formed on the small end side of the raceway surface 3a. Gavels 3c extending outward in the radial direction are integrally formed. On the large end side and the small end side of the inner peripheral slope 3d of the inner ring 3, there are provided raised portions 3e, 3f that protrude inward in the radial direction. However, the region (effective track region) where the tapered roller 4 is in rolling contact with the track surface 3a of the inner ring 3 is set to a substantially uniform thickness. The small-diameter damping member 7 has a triangular cross section in the upper half, and three corners are chamfered. In the damping member 7, the chamfered corners at an angle of 90 degrees are R-shaped chamfers, and the remaining two corners are chamfered flat. When the chamfer is R-shaped, it can be easily attached to the fixing member.

  The large-end-side raised portion 2c of the outer ring 2 has a circular outer peripheral surface 2c1 and a side wall surface 2c2 along the radial direction, and the small-end-side raised portion 2d of the outer ring 2 has a circular outer peripheral surface 2d1 and an outer ring 2 A small end face and an outer wall face 2d2 continuous in the radial direction. The reason why the circular outer peripheral surface 2d1 is provided on the outer diameter side inclined surface 2b of the outer ring 2 is that the circular inner peripheral surface 6a of the large-diameter damping member 6 is a fitting surface that is press-fitted and prevented from coming off, and This is because the large-diameter damping member 6 is used as a reference surface for centering. The reason why the side wall surface 2c2 is provided on the outer diameter side inclined surface 2b of the outer ring 2 is to use it as a reference surface of a notch dimension when forming a notch region in the outer ring 2.

  The large-end-side raised portion 3e of the inner ring 3 has a circular inner peripheral surface 3e1 and an outer wall surface 3e2 that is continuous with the large-end surface of the inner ring 3 in the radial direction, and the small-end-side raised portion 3f of the inner ring 3 has a circular shape. It has an inner peripheral surface 3f1 and a side wall surface 3f2 along the radial direction. The reason why the circular inner peripheral surface 3e1 is provided on the inner diameter side inclined surface 3d of the inner ring 3 is that the circular outer peripheral surface 7a of the small-diameter damping member 7 is a fitting surface that is press-fitted and prevented from coming off, and the small diameter This is because the vibration damping member 7 is used as a reference surface for centering. The reason why the side wall surface 3f2 is provided on the inner diameter side inclined surface 3d of the inner ring 3 is to provide a reference surface for the notch dimension when forming the notch region in the inner ring 3.

  Then, with the large-diameter damping member 6 attached to the outer ring 2, the circular outer circumferential surface 6b of the damping member 6 is slightly smaller than the circular outer circumferential surface 2c1 of the large end side raised portion 2c of the outer ring 2 (for example, 10 μm). In order to project the large end surface 6c of the damping member 6 slightly in the axial direction (for example, about 10 μm) more than the outer wall surface 2d2 of the outer ring 2, the damping member 6 has a circular shape. The outer diameter A1 of the outer peripheral surface 6b is appropriately larger than the outer diameter D1 of the circular outer peripheral surface 2c1 of the large-end raised portion 2c of the outer ring 2, and the axial dimension A2 of the damping member 6 is notched in the outer ring 2. It is appropriately larger than the axial dimension W1 of the region. However, with the large-diameter damping member 6 attached to the outer ring 2, the circular outer circumferential surface 6b of the damping member 6 is flush with the circular outer circumferential surface 2c1 of the large-end-side raised portion 2c of the outer ring 2, and The large end surface 6 c of the vibration member 6 may be flush with the outer wall surface 2 d 2 of the outer ring 2.

  Further, in a state where the small-diameter damping member 7 is attached to the inner ring 3, the circular inner peripheral surface 7b of the damping member 7 is slightly smaller than the circular inner peripheral surface 3f1 of the small end side raised portion 3f of the inner ring 3 (for example, In order to project the large end surface 7c of the damping member 7 slightly in the axial direction (for example, about 10 μm) from the outer wall surface 3e2 of the inner ring 3, the projecting member 7 has a circular shape. The inner diameter B1 of the inner peripheral surface 7b is appropriately made smaller than the inner diameter D2 of the circular inner peripheral surface 3f1 of the small end-side raised portion 3f of the inner ring 3, and the axial dimension B2 of the damping member 7 is notched in the inner ring 3. It is appropriately larger than the axial dimension W2 of the region. However, in a state where the small-diameter damping member 7 is attached to the inner ring 3, the circular inner peripheral surface 7b of the damping member 7 is flush with the circular inner peripheral surface 3f1 of the small end side raised portion 3f of the inner ring 3, The large end surface 7 c of the vibration damping member 7 may be flush with the outer wall surface 3 e 2 of the inner ring 3.

  The cage 5 includes substantially trapezoidal pockets 5a penetrating in the radial direction at a plurality of locations in the circumferential direction in order to hold the tapered rollers 4 between the raceway surfaces 2a and 3a. The outer dimension of the cage 5 is larger than the outer diameter dimension of the virtual conical surface X connecting the center lines of the plurality of tapered rollers 4 arranged on the raceway surface 3a of the inner ring 3, The circumferential width of the pocket 5a is smaller than the outer diameter of the tapered roller 4. As a result, when the cage 5 is arranged on the inner ring 3 and the tapered roller 4 is forcibly fitted into each pocket 5a of the cage 5 from the outside in the radial direction, the tapered roller 4 does not come out from the pocket 5a radially outward. Thus, the inner ring 3, the cage 5, and the tapered roller 4 become a non-separated assembly.

  The outer ring 2, the inner ring 3 and the rolling element 4 are made of, for example, high carbon chromium bearing steel, carburized bearing steel, or the like. The cage 5 is manufactured by pressing a steel plate, but can also be manufactured by molding a synthetic resin material.

  Further, the damping members 6 and 7 are made of a metal or resin having a vibration damping property superior to that of the metal used as the material of the outer ring 2 or the inner ring 3. The material of the damping members 6 and 7 is preferably selected in consideration of not only vibration damping properties but also mechanical strength and fatigue fracture strength. Specifically, the metals as the damping members 6 and 7 include all the metals that are generally known to have excellent vibration damping properties. For example, Mn—Cu alloys, Fe—Al alloys, Ni— Ti-based alloys, Al—Zn-based alloys and the like are preferable. For example, a Mn—Cu alloy is excellent in vibration damping, self-lubricating, formability, workability, and nonmagnetic properties. In addition, examples of the resin as the damping members 6 and 7 include a fluorine-based resin such as PTFE (polytetrafluoroethylene), but other resins can also be used depending on applications. The mechanism of consumption of vibration energy by the materials described above is well known.

  By the way, the rolling bearing 1 mentioned above can be used suitably inside the transmission for vehicles, such as a motor vehicle, for example. In this case, it is advantageous for suppressing noise by suppressing vibration inside the transmission. Usually, in a transmission for a vehicle, vibration is generated due to the meshing of gears, etc., and this vibration passes from a shaft provided with the gear through a rolling bearing that rotatably supports the shaft to the case. It is transmitted to and becomes noise. This noise can be effectively suppressed by using the above-mentioned rolling bearing 1 for supporting the shaft as the rolling bearing 1 described above.

  As an example, the above-described rolling bearing 1 is used to rotatably support a shaft 11 in a non-rotating case 10 as shown in FIG. 3, for example. In some cases, the case 10 is rotated and the shaft 11 is not rotated. The rolling bearing 1 is incorporated between the first block 10a of the case 10 and one side of the gear 12 on the shaft 11, and between the second block 10b of the case 10 and the other side of the gear 12 on the shaft 11, respectively. The outer shape of the assembly of the outer ring 2 and the large-diameter damping member 6 is substantially the same as that of the ready-made outer ring, and the outer shape of the assembly of the inner ring 3 and the small-diameter damping member 7 is substantially the same as that of the ready-made inner ring. As a result, the outer dimensions of the rolling bearing 1 are made substantially the same as those of the off-the-shelf rolling bearing. Therefore, the rolling bearing 1 is incorporated between the case 10 and the shaft 11 without changing the shape and specifications of the case 10 and the shaft 11. be able to.

  Moreover, in the rolling bearing 1, the circular outer peripheral surface 6 b of the outer ring 2 and the circular outer peripheral surface 6 b of the large-diameter damping member 6 are provided on the inner peripheral surface of the first block 10 a and the inner peripheral surface of the second block 10 b of the case 10. And the circular inner peripheral surface 3e1 of the inner ring 3 and the circular inner peripheral surface 7b of the small-diameter damping member 7 are fitted together on the outer peripheral surfaces of both sides of the gear 12 in the shaft 11. . As a result, the large-diameter damping member 6 and the small-diameter damping member 7 reliably abut against the case 10 and the shaft 11, respectively, so that the damping members 6 and 7 can effectively attenuate the vibration. In addition, since not only the damping members 6 and 7 but also the outer ring 2 and the inner ring 3 can bear the radial load, the rigidity of the entire bearing can be ensured. The use of the metal as the damping members 6 and 7 is advantageous in securing rigidity as compared with the case of resin, and is effective in suppressing high-frequency vibration because of its high natural frequency. In addition, since the damping members 6 and 7 are in contact with the case 10 and the shaft 11 and are covered with the outer ring 2 and the inner ring 3 and are not exposed to the outside, they can come into contact with the lubricating oil around the rolling bearing 1. Therefore, when the lubricating oil is present around the rolling bearing 1, the lubricating oil does not need to touch the vibration damping members 6 and 7. Such an installation configuration is advantageous when the damping members 6 and 7 are made of a material having poor oil resistance, for example.

  Here, if vibration occurs on the shaft 11 side, vibration transmission from the shaft 11 to the inner ring 3 is suppressed or prevented by damping the vibration by the small-diameter damping member 7, and further, the vibration is transferred from the inner ring 3. Even if a slight vibration is transmitted to the outer ring 2 via the moving body 4, the vibration transmission from the outer ring 2 to the case 10 is suppressed or prevented by attenuating this vibration with the large-diameter damping member 6. Conversely, when vibration occurs on the case 10 side, the large-diameter damping member 6 attenuates the vibration, thereby suppressing or preventing vibration transmission from the case 10 to the outer ring 2, and from the outer ring 2 to the rolling element. Even if a slight vibration is transmitted to the inner ring 3 via 4, the vibration transmission from the inner ring 3 to the shaft 11 is suppressed or prevented by attenuating this vibration with the damping member 7 having a small diameter.

  As described above, vibration generated on the case 10 and the shaft 11 side is attenuated by the vibration damping members 6 and 7 attached to the rolling bearing 1, and vibration transmission between the case 10 and the shaft 11 can be cut off. It is possible to suppress the generation level of vibration and noise during operation of the apparatus using 1. Therefore, vibration and noise can be suppressed without changing the structure to be installed of the rolling bearing 1 as it is.

  Hereinafter, other embodiments of the present invention will be described.

  For example, FIG. 4 shows an example in which the present invention is applied to an angular ball bearing. In the rolling ball bearing 1 of the angular ball bearing type shown in FIG. 4, the outer diameter side corner of the thick outer portion of the outer ring 2 is cut out, and a large-diameter damping member 6 is attached to the notched region. The inner diameter side corner of the thick inner ring 3 is cut out, and a small-diameter damping member 7 is attached to the cutout region. The large-diameter damping member 6 has a circular inner peripheral surface 6a as a shoulder and is fitted into a circular outer peripheral surface 2d1 in a cutout region of the outer ring 2 by press-fitting, so that a large-diameter vibration damping member is formed in the shoulder outer ring 2. The member 6 is attached integrally. The small-diameter damping member 7 has the circular outer peripheral surface 7a as a shoulder and is fitted into the circular inner peripheral surface 3e1 in the cutout region of the inner ring 3 by press-fitting, whereby the small-diameter damping member 7 is integrated with the shoulder inner ring 3. Attached. As in the configuration shown in FIG. 1, the outer dimensions of the assembly in which the damping members 6 and 7 are attached to the shoulder ring, the outer ring 2 and the shoulder ring and the inner ring 3 are substantially the same as those of the ready-made products. The details of the other main parts are the same as in the above embodiment.

  The shape of the damping members 6 and 7 is not particularly limited. Moreover, although the case where the damping member on the fixed peripheral surface side and the damping member on the fixed end surface side are integrated is shown, the damping member can be separately attached to the fixed outer peripheral surface and the fixed large end surface of the outer ring 2. Similarly, the damping member can be separately attached to the fixed inner peripheral surface and the fixed large end surface of the inner ring 3.

Sectional drawing which shows the upper half of the rolling bearing which concerns on one Embodiment of this invention. 1 is an exploded view of the rolling bearing of FIG. Sectional drawing which shows the usage example of the rolling bearing of FIG. Sectional drawing which shows the upper half of the rolling bearing which concerns on other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rolling bearing, 2 ... Outer ring, 3 ... Inner ring, 4 ... Rolling body, 6, 7 ... Damping member.

Claims (3)

In a rolling bearing having a plurality of rolling elements interposed between an outer ring and an inner ring,
A damping member is attached to a part of the fixed peripheral surface and the fixed end surface of at least one of the outer ring and the inner ring,
The damping member has a surface that is substantially flush with the fixed peripheral surface and the fixed end surface of the one wheel, and the assembly of the damping member and the one wheel is the outer ring or the inner ring. Rolling bearing characterized by   The rolling bearing according to claim 1, wherein the damping member is provided at a corner portion extending from a fixed peripheral surface of the one wheel to a fixed end surface.   The outer ring and the inner ring are obliquely contacted with the rolling elements, and the damping member extends from the fixed peripheral surface to the fixed end surface on the thick part side of at least one of the outer ring and the inner ring. The rolling bearing according to claim 1, wherein the rolling bearing is provided on the rolling bearing.

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