JP4687494B2 - Rolling bearing device - Google Patents

Description

  The present invention relates to a rolling bearing device including a rolling bearing and a vibration damping member.

  Conventionally, as a rolling bearing device, there is one described in JP 2004-108539 A (Patent Document 1). This rolling bearing device includes a ball bearing disposed on the outer peripheral surface of the rotating shaft, and an annular damping member that is fitted and fixed between the outer peripheral surface of the outer ring of the ball bearing and the housing. The damping member is made of a twin type alloy material. The conventional rolling bearing device is a vibration damping member disposed on the outer peripheral side of the outer ring, and suppresses vibration by damping vibration transmitted from the rotating shaft and the housing.

However, in the conventional rolling bearing device, since the damping member is made of a twin-type alloy material having a large linear expansion coefficient compared to the steel material used in the bearing, when the temperature of the bearing device increases, the outer ring Due to the difference in coefficient of linear expansion between the outer ring and the damping member, a large gap is generated between the outer ring and the damping member, and the damping performance of the damping member is lost. There is a problem that creep occurs on the fitting surface between the outer ring and the damping member.
JP 2004-108539 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing device that can dampen vibration, prevent the bearing from coming off in the axial direction, and hardly cause creep on the fitting surface of the damping member with respect to the bearing.

In order to solve the above problems, the rolling bearing device of the present invention is
An inner ring having a raceway surface;
An outer ring having a raceway surface;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring;
It is fitted and fixed between the outer peripheral surface of the outer ring and the inner peripheral surface of the fixed portion, and includes an annular vibration damping member made of a ferromagnetic vibration damping alloy material,
The inner peripheral surface of the damping member fitted to the outer peripheral surface of the outer ring, a groove extending in the axial direction to form a gap between the outer peripheral surface of the outer ring is formed, among the fixed part A groove extending in the axial direction is formed on the outer peripheral surface of the vibration damping member fitted to the peripheral surface so as to form a gap with the inner peripheral surface of the fixed portion.

  The inventor adopts a damping member made of a ferromagnetic damping alloy material as the damping member, so that creep does not occur on the fitting surface of the damping member even when the temperature is high, and It was discovered that the rolling bearing can be reliably prevented from coming off.

  In addition, even if the inventor employs a damping member made of a ferromagnetic damping alloy material that loses damping properties when the strain increases, the inventor has the outer peripheral surface of the annular damping member. In the case where a gap is formed between at least one part of the inner peripheral surface and at least one of the outer peripheral surface and the inner peripheral surface and a part of the member that is radially opposed, It was discovered that the damping performance of the damping member is not lost, and that the damping member can reliably attenuate the vibration.

  According to the present invention, since the damping member made of a ferromagnetic damping alloy material is adopted as the damping member, even if the temperature rises, creep occurs on the fitting surface of the damping member. And it is possible to reliably prevent the rolling bearing from coming out.

  Further, according to the present invention, as the damping member, a damping member made of a ferromagnetic type damping alloy material that loses damping properties when the strain increases is adopted. Between at least one of a part of the outer ring and a part of the outer peripheral surface of the outer ring, and a part of the outer peripheral surface of the damping member and a part of the inner peripheral surface of the fixed part In addition, since the gap is formed, the distortion can be released in the gap and the vibration damping property is not lost. Therefore, the vibration can be reliably damped by the damping member.

The rolling bearing device of the present invention is
An inner ring having a raceway surface;
An outer ring having a raceway surface;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring;
It is fitted and fixed between the inner peripheral surface of the inner ring and the outer peripheral surface of the shaft, and includes an annular damping member made of a ferromagnetic damping alloy material,
A groove extending in the axial direction is formed on the outer peripheral surface of the vibration damping member fitted to the inner peripheral surface of the inner ring so as to form a gap between the inner peripheral surface of the inner ring and the outer periphery of the shaft. the inner peripheral surface of the damping member to be fitted to the surface, is characterized in that grooves extending in the axial direction to form a gap between the outer peripheral surface of the shaft are formed.

  According to the present invention, since the damping member made of a ferromagnetic damping alloy material is adopted as the damping member, even if the temperature rises, creep occurs on the fitting surface of the damping member. And it is possible to reliably prevent the rolling bearing from coming out.

  Further, according to the present invention, a vibration damping member made of a ferromagnetic vibration damping alloy material that loses vibration damping properties when the strain increases is adopted as the vibration damping member. Between at least one of a part and a part of the inner peripheral surface of the inner ring, a part of the inner peripheral surface of the damping member, and a part of the outer peripheral surface of the shaft In addition, since the gap is formed, the distortion can be released in the gap and the vibration damping property is not lost. Therefore, the vibration can be reliably damped by the damping member.

  According to the rolling bearing device of the present invention, since the damping member made of a ferromagnetic damping alloy material is adopted as the damping member, even if the temperature is high, creep is applied to the fitting surface of the damping member. And the rolling bearing can be reliably prevented from coming off.

  Further, according to the rolling bearing device of the present invention, at least one of the outer peripheral surface and the inner peripheral surface of the annular vibration damping member, at least one of the outer peripheral surface and the inner peripheral surface, and the diameter thereof. Since a gap is formed between a part of the members facing in the direction, the vibration damping performance of the vibration damping member is not lost, and the vibration can be reliably damped by the vibration damping member.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

Figure 1 is a part of the first radial cross-sectional view of the ball bearing apparatus is a reference example of the rolling rising bearing device (specifically, in the radial direction of the track base of the raceway grooves is raceway surface of the outer ring 1 section It is a figure).

  This ball bearing device includes an outer ring 1, an inner ring 2, a ball 3 as an example of a rolling element, and an annular damping member 4. A plurality of the balls 3 are arranged between the raceway surface of the outer ring 1 and the raceway surface of the inner ring 2 while being held by the cage 6 with a constant interval in the circumferential direction.

  The damping member 4 is made of an Fe—Al based alloy material as an example of a ferromagnetic damping alloy material. The vibration damping member 4 is fitted and fixed to the outer peripheral surface of the outer ring 1, and is fixed to the inner peripheral surface of a housing 8 of a machine as an example of a fixing portion where the ball bearing is disposed. Has been. A groove 10 is formed on the inner peripheral surface of the vibration damping member 4 (the fitting surface with respect to the outer ring 1). The groove 10 has a substantially rectangular shape in cross section and extends substantially in the axial direction. The depth direction of the groove 10 substantially coincides with the radial direction of the annular damping member 4. A plurality of the grooves 10 are arranged at substantially equal intervals in the circumferential direction.

  Ferromagnetic damping alloy materials have a damping action in the absence of strain, while they are distorted as little as possible (compressive strain or It is known that the damping effect is significantly reduced if there is even a small amount of tensile strain. For this reason, there has been no idea of damping vibration by arranging a damping member made of a ferromagnetic damping alloy material on the inner circumference of the inner ring or the outer circumference of the outer ring of the rolling bearing. That is, when a damping member made of a ferromagnetic damping alloy material is fitted and fixed to an inner ring or an outer ring with a tightening margin, the damping (compression strain or tensile strain) caused by the fitting and fixing causes the damping. It is considered that the vibration damping performance of the vibration member is lost, and there has been no idea of arranging a vibration damping member made of a ferromagnetic vibration damping alloy material on the inner periphery of the inner ring of the rolling bearing or the outer periphery of the outer ring.

  However, the inventor of the present invention has adopted a case where an annular vibration damping member made of a ferromagnetic vibration damping alloy material is fixed by being fitted on the outer peripheral surface of the outer ring, or an annular vibration damping material made of a ferromagnetic vibration damping alloy material. When the member is fitted and fixed to the inner peripheral surface of the inner ring, at least one of the outer peripheral surface and the inner peripheral surface of the damping member, at least one of the outer peripheral surface and the inner peripheral surface, and the radial direction If a gap is formed between part of the opposing members, distortion on the mating surface of the damping member can be effectively released, and the damping property of the damping member is not lost and has great damping performance I found This is presumed to be because no stress is generated in the gap and the fitting stress can be reduced.

  In addition, when the damping member is formed using a ferromagnetic damping alloy material, the inventor does not generate creep on the fitting surface of the damping member and rolls even when the temperature is high. It was found that the bearing would not come out. This is because the ferromagnetic damping alloy material has substantially the same linear expansion coefficient as high carbon chromium bearing steel (SUJ2) and carburized steel (SAE5120) used as a bearing material. This is presumably because the fitting state between the two is substantially invariant to temperature fluctuations, and the fitting state does not have temperature dependence.

According to the rolling bearing device of the first reference example, the damping member 4 made of a ferromagnetic damping alloy material is employed as the damping member. Therefore, even if the temperature rises, Creep is not generated on the mating surface, and the rolling bearing can be reliably prevented from coming off.

Further, according to the rolling bearing device of the first reference example , the groove 10 is formed on the inner peripheral surface (fitting surface with respect to the outer ring 1) of the damping member 4, so that the inner peripheral surface of the damping member 4 is Since a gap is formed between a part and a part of the outer peripheral surface of the outer ring 1, the distortion of the damping member 4 can be efficiently released by this gap. Therefore, even if the damping member 4 made of a ferromagnetic damping alloy material is adopted as the damping member as in this reference example , the damping performance of the damping member 4 is not lost, and the damping member is not lost. Vibration can be reliably damped by the vibration member 4. Further, since vibration is not transmitted to the groove 10, the damping performance of the damping member 4 can be improved from this point.

In particular, according to the rolling bearing device of the first reference example , the inner circumferential surface of the damping member 4 that is in contact with the outer circumferential surface of the outer ring, which is considered to have particularly high fitting stress, is provided at predetermined intervals in the circumferential direction. Since the groove 10 extending in the axial direction is formed, the stress in the circumferential direction can be effectively released at the groove 10 portion, and the force pulled in the circumferential direction at the groove 10 portion is greatly reduced. can do. Therefore, since the fitting stress can be rapidly reduced, the effect of preventing the vibration damping performance of the vibration damping member from being lowered is particularly increased.

In the rolling bearing device of the first reference example , the groove 10 extending in the axial direction is provided in the circumferential direction on the inner circumferential surface of the annular damping member 4 that is fitted and fixed to the outer circumferential surface of the outer ring 1. A plurality of grooves are formed at equal intervals. In the present invention, grooves extending in the axial direction are not equally spaced in the circumferential direction on the inner circumferential surface of the annular damping member that is fitted and fixed to the outer circumferential surface of the outer ring 1. A plurality may be formed at intervals.

Further, in the rolling bearing device of the first reference example , the cross-sectional shape of the axially extending groove 10 formed on the inner peripheral surface of the annular damping member 4 is substantially rectangular. The cross-sectional shape of the groove formed in the inner peripheral surface of the annular damping member extending in the axial direction may be a shape other than the rectangular shape such as a semicircular shape or a triangular shape.

Further, in the rolling bearing device of the first reference example , the groove 10 extending in the axial direction is provided in the circumferential direction on the inner circumferential surface of the annular damping member 4 that is fitted and fixed to the outer circumferential surface of the outer ring 1. As shown in FIG. 2, the vibration damping member 24 is fitted and fixed between the outer peripheral surface of the outer ring 21 and the inner peripheral surface of the housing 28 as an example of a fixing portion. A plurality of grooves 30 extending in the axial direction may be formed on the outer circumferential surface at equal intervals or not at regular intervals in the circumferential direction. Further, in the present invention, as shown in FIG. 3, the inner surface of the damping member 44 fitted and fixed between the outer peripheral surface of the outer ring 41 and the inner peripheral surface of the housing 48 as an example of the fixing portion. A plurality of axially extending grooves 50 are formed on the circumferential surface at equal intervals or not at regular intervals in the circumferential direction, and axially extending grooves 60 are formed on the outer circumferential surface of the damping member 44 in the circumferential direction. A plurality may be formed at equal intervals or at non-equal intervals. In this case, as shown in FIG. 3, an axially extending groove 50 formed in the inner peripheral surface of the vibration damping member 44 and an axial direction formed in the outer peripheral surface of the vibration damping member 44 are provided. It is preferable to arrange the grooves 60 to be alternately arranged in the circumferential direction. If it does in this way, the stress in the damping member 44 can be made uniform, and the effect which prevents the fall of the damping property of a damping member can be enlarged.

In the rolling bearing device of the first reference example , an Fe—Al alloy material is employed as the ferromagnetic vibration damping alloy material. However, in the present invention, the Fe—Cr alloy material is employed as the ferromagnetic vibration damping alloy material. Alloy materials (e.g., Silentaroy (registered trademark), Gentalloy (registered trademark), etc.), strong materials described in JP-A-52-73118, JP-A-4-99148, and JP-A-06-220583 Any ferromagnetic vibration damping alloy material such as a magnetic vibration damping alloy material may be employed. In this case, the same effect as that obtained when a vibration damping member made of an Fe—Al alloy material can be obtained.

Figure 4 is an axial sectional view of a ball bearing apparatus according to a second reference example of the rolling rising bearing device.

In the ball bearing device of the second reference example , the description of the operation and effect common to the ball bearing device of the first reference example will be omitted, and the configuration, operation and effect different from the ball bearing device of the first reference example will be omitted. Only the modification will be described.

  This ball bearing device includes an inner ring 71, an outer ring 72, a ball 73 as an example of a rolling element, and an annular damping member 74.

  The balls 73 are arranged between the raceway surface of the inner ring 71 and the raceway surface of the outer ring 72 in a state where the balls 73 are held by the cage 75 at substantially equal intervals in the circumferential direction. The damping member 74 is made of an Fe—Al alloy material as an example of a ferromagnetic damping alloy material. The vibration damping member 74 is externally fitted and fixed to the outer peripheral surface of the outer ring 72, while being fixedly fitted and fixed to the inner peripheral surface of a machine housing 78 in which the ball bearing is disposed. A groove 80 is formed on the inner peripheral surface of the vibration damping member 74 (the fitting surface that is fitted to the outer ring 72). The groove 80 has a substantially rectangular cross section and extends in a substantially circumferential direction. The depth direction of the groove 80 substantially coincides with the radial direction of the annular damping member 74. A plurality of the grooves 80 are arranged at substantially equal intervals in the axial direction.

According to the rolling bearing device of the second reference example , since the grooves 80 extending in the circumferential direction are formed at predetermined intervals in the axial direction, mainly the axial distortion of the fitting surface can be reduced. And the fall of the damping property of the damping member 74 can be prevented.

In the above-described rolling bearing device and the second reference example, the groove 80 is an annular groove, but not extend substantially circumferentially of the fitted on vibration damping member fixed to the outer peripheral surface of the outer ring The groove formed on the inner peripheral surface (fitting surface) may be a spiral groove extending around the central axis of the bearing device in a spiral shape. As described above, when the spiral groove is employed, not only the axial distortion but also the circumferential distortion can be reduced, and the effect of preventing the damping performance of the damping member from being lowered is increased.

Further, in the rolling bearing device of the second reference example , grooves 80 extending in the circumferential direction are provided at predetermined intervals in the axial direction on the inner peripheral surface of the vibration damping member 74 that is fitted and fixed to the outer peripheral surface of the outer ring 72. was formed for each, the outer peripheral surface of the fitted on vibration damping member fixed to the outer peripheral surface of the outer ring, the groove extending in the circumferential direction in the axial direction may be formed at predetermined intervals. Further, a spiral groove extending in a spiral shape around the central axis of the rolling bearing may be formed on the outer peripheral surface of the vibration damping member that is fitted and fixed to the outer peripheral surface of the outer ring.

Further, in the rolling bearing of the second reference example , grooves extending in the circumferential direction are formed at predetermined intervals in the axial direction on the inner circumferential surface of the damping member that is fitted and fixed to the outer circumferential surface of the outer ring. but between the inner ring and the rotating shaft of the rolling rising bearings, as well as placing the damping member annular made of a ferromagnetic type damping alloy material, the outer peripheral surface or inner peripheral surface of the annular damping member, the circumferential direction Grooves extending in the axial direction may be formed at predetermined intervals in the axial direction. Further, between the inner ring and the rotating shaft of the rolling rising bearings, as well as placing the damping member annular made of a ferromagnetic type damping alloy material, the outer peripheral surface or inner peripheral surface of the annular damping member, the rolling bearing A spiral groove extending in a spiral shape around the central axis may be formed.

In the rolling bearing devices of the first and second reference examples and their modifications, the damping member has a shape that contacts only the outer peripheral surface of the outer ring or the inner peripheral surface of the inner ring. Then, the vibration damping member may have a shape that abuts on the outer circumferential surface of the outer ring and abuts on at least a part of the axial end surface of the outer ring. Further, the vibration damping member may be in contact with the inner peripheral surface of the inner ring and may be in contact with at least a part of the end surface in the axial direction of the inner ring.

In the first and second reference examples , the rolling bearing included in the rolling bearing device is a ball bearing. However, the rolling bearing included in the rolling bearing device of the present invention is not limited to a ball bearing. Of course, it may be a rolling bearing other than a ball bearing such as a roller bearing.

Which is part of the first radial cross-sectional view of the ball bearing apparatus is a reference example of the rolling rising bearing device. It is a part of sectional drawing of the radial direction of the ball bearing apparatus of the modification of a 1st reference example . It is a part of sectional drawing of the radial direction of the ball bearing apparatus of one Embodiment of this invention . It is an axial sectional view of a ball bearing apparatus according to a second reference example of the rolling rising bearing device.

1,21,41,72 Outer ring 2,71 Inner ring 3,73 Ball 4,24,44,74 Damping member 8,28,48,78 Housing 10,30,50,60,80 Groove

Claims (2)

An inner ring having a raceway surface;
An outer ring having a raceway surface;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring;
It is fitted and fixed between the outer peripheral surface of the outer ring and the inner peripheral surface of the fixed portion, and includes an annular vibration damping member made of a ferromagnetic vibration damping alloy material,
The inner peripheral surface of the damping member fitted to the outer peripheral surface of the outer ring, a groove extending in the axial direction to form a gap between the outer peripheral surface of the outer ring is formed, among the fixed part The rolling is characterized in that a groove extending in the axial direction is formed on the outer peripheral surface of the damping member fitted to the peripheral surface to form a gap with the inner peripheral surface of the fixed portion. Bearing device. An inner ring having a raceway surface;
An outer ring having a raceway surface;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring;
It is fitted and fixed between the inner peripheral surface of the inner ring and the outer peripheral surface of the shaft, and includes an annular damping member made of a ferromagnetic damping alloy material,
A groove extending in the axial direction is formed on the outer peripheral surface of the vibration damping member fitted to the inner peripheral surface of the inner ring so as to form a gap between the inner peripheral surface of the inner ring and the outer periphery of the shaft. the inner peripheral surface of the damping member to be fitted to the surface, the rolling bearing apparatus characterized by grooves extending axially to form a gap between the outer peripheral surface of the shaft is formed .

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