Electric corrosion prevention member for rolling bearing and electric corrosion prevention rolling bearing unit

Abstract

The present disclosure provides an electrolytic corrosion prevention member and an electrolytic corrosion prevention rolling bearing unit to which the electrolytic corrosion prevention member is attached, the electrolytic corrosion prevention member being capable of suppressing the generation of abrasion powder from a conductive member or the generation of abrasion powder accompanying sliding contact between the conductive member and a counterpart member, and also being capable of suppressing damage to the counterpart member, and not only further being capable of preventing damage to the counterpart member. The electric corrosion prevention member does not form new processing on a bearing, and can cope with an existing bearing in a manner that the type of the bearing is not limited. This electrolytic corrosion prevention member for a rolling bearing is provided with: a spring plate that includes an annular part and one or more elastic parts that are continuous from the annular part and extend radially; and a soft conductive member attached to a surface of the elastic portion facing the rotating ring, the soft conductive member being capable of coming into contact with a side surface of the rotating ring. In addition, the electric corrosion prevention rolling bearing unit is provided with the electric corrosion prevention member.

Description

Technical Field

[0001] The present invention relates to an anti-electrocorrosion member for a rolling bearing which is attached to prevent electrocorrosion of a rolling bearing in a rolling bearing unit, and an anti-electrocorrosion rolling bearing unit to which the anti-electrocorrosion member for a rolling bearing is attached. Background Art

[0002] In recent years, the practical application of electric vehicles that drive the wheels by configuring an electric motor as a drive source on the inner side or near the wheel has gradually advanced. Such a drive motor is generally called an in-wheel motor. Regarding the structure of a general in-wheel motor, a stator is fixed to the motor housing, and a rotor is configured on the inner diameter side of the stator in a manner that a gap is opened in the radial direction. This is a so-called inner rotor type motor. In addition, as a driving method for the in-wheel motor, considering the performance and control performance of the motor, a brushless DC (Direct Current) motor driven by an inverter is more commonly used.

[0003] In the drive method using an inverter, a potential difference is generated between the stator and the rotor due to the parasitic capacitance between the stator and the rotor. Due to this potential difference, the so-called shaft voltage / shaft current is generated. When this shaft current passes through the rolling bearing supporting the rotor, a phenomenon called "electrocorrosion" occurs, which damages the rolling bearing. Specifically, current flows locally in the contact area between the raceway surface of the outer ring / inner ring of the rolling bearing and the rolling element, and the track surface or rolling surface melts, etc., resulting in unevenness. As a result, the raceway surface and rolling element surface of the bearing become rough, which not only causes noise and vibration, but also affects the life of the bearing when excessive electrocorrosion occurs.

[0004] In order to prevent electrical corrosion of rolling bearings, measures have been taken to sandwich conductive components. For example, the following technology is proposed in Patent Documents 1 and 2, which is composed of a contact body for electrically conducting with the rotor of the motor, an elastic body for pressing the contact body toward the rotor side, and a storage portion for accommodating the contact body and the elastic body. This technology arranges the storage portion in the motor housing so that it is electrically connected to the motor stator via the motor housing.

[0005] Furthermore, Patent Document 3 proposes a grounding device in which the tip of a broom-shaped conductive fiber is brought into contact with the outer peripheral surface of a rotating shaft.

[0006] Moreover, Patent Document 4 proposes an anti-electrocorrosion device, which uses an elastic conductor, which bends an annular seat portion connected to the end face of the bearing outer ring into a wave washer shape, and has a contact piece that extends from the inner side of the annular seat portion and connects to the vicinity of the center portion of the end face of the rotating shaft. In the anti-electrocorrosion device, the surface of the annular seat portion is pressed by the cover-like wall of the bearing seat while the annular seat portion is overlapped with the end face of the bearing outer ring embedded in the bearing seat and the contact piece is in contact with the vicinity of the center portion of the end face of the rotating shaft embedded in the bearing inner ring, so that the anti-electrocorrosion device is electrically conductive.

[0007] In addition, Patent Document 5 proposes the following technology: a rod-shaped conductive brush is accommodated in a support hole provided in one of the two rings, and an elastic component is used to apply force to the top end of the conductive brush toward the other ring side so that the top end of the conductive brush is in sliding contact, thereby achieving electrical conduction between the two rings.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Publication No. 2011-135720

[0011] Patent Document 2: Japanese Patent Application Publication No. 2011-135722

[0012] Patent Document 3: Japanese Patent Application Publication No. 2020-127257

[0013] Patent Document 4: Japanese Patent Application Laid-Open No. 2002-146568

[0014] Patent Document 5: Japanese Utility Model Application Laid-Open No. 4-8820

[0015] However, in any technology described in any patent document, the wear powder generated from the conductive member will become a contaminant of the lubricating oil or grease composition sealed therein for lubrication, and may damage the raceway surface or rolling surface. In addition, the wear powder may also damage the counterpart member of the conductive member.

[0016] Specifically, in Patent Documents 1 and 2, the contact body, elastic body, and storage body are metal components, which will slide in contact with the vibration of the motor, thereby generating metal powder. In addition, the contact body, elastic body, and storage body need to be arranged in the motor housing, and space for this operation is also required.

[0017] In addition, in Patent Document 3, the tip of the broom-shaped conductive fiber is brought into contact with the outer peripheral surface of the rotating shaft, but in order to make the contact area between the tip of the broom-shaped conductive fiber and the rotating shaft larger than when the two are simply brought into contact, the broom-shaped conductive fiber is brought into contact with the outer peripheral surface of the rotating shaft in a bent state. That is, the tip of the broom-shaped conductive fiber is brought into contact with the outer peripheral surface of the rotating shaft with a certain degree of large pressing force, so the wear powder is generated. At the same time, the outer peripheral surface of the rotating shaft, which is the counterpart of the broom-shaped conductive fiber, is also damaged.

[0018] Furthermore, in Patent Document 4, since both the elastic conductor and the rotating shaft are made of metal and the two are in sliding contact, metal powder is generated and the end surface of the rotating shaft, which is the counterpart member of the elastic conductor, is damaged.

[0019] In addition, in Patent Document 5, the tip of the rod-shaped conductive brush contacts the other ferrule under a force applied thereto, so that abrasion powder of the conductive brush is generated. At the same time, the other ferrule, which is the counterpart member of the conductive brush, is also damaged. Furthermore, a support hole for accommodating the conductive brush and the elastic member needs to be formed in the ferrule, which applies a large load to the ferrule. Summary of the invention

[0020] Therefore, the object of the present invention is to provide an anti-electrocorrosion component with a space-saving and inexpensive structure and an anti-electrocorrosion rolling bearing unit equipped with the anti-electrocorrosion component, wherein the anti-electrocorrosion component can suppress the generation of wear powder from the conductive component or the generation of wear powder accompanying the sliding contact between the conductive component and the other component, and can also suppress damage to the other component. Not only that, the anti-electrocorrosion component will not form new processing on the bearing. In addition, it can cope with existing bearings in a manner without restriction on the type of bearings.

[0021] The above-mentioned object of the present invention is achieved by the following structure [1] of the anti-electrolytic corrosion member for rolling bearings.

[0022] [1] An anti-electrocorrosion component for a rolling bearing, which is attached to a rolling bearing unit having a rolling bearing so as to prevent electrocorrosion of the rolling bearing in the rolling bearing unit, wherein one ring of the rolling bearing is a fixed ring and the other ring is a rotating ring, and the anti-electrocorrosion component for a rolling bearing is characterized in that it comprises: a spring plate including an annular portion and a plurality of elastic portions, and formed of a thin plate of a conductive material, wherein the plurality of elastic portions extend continuously and radially from the annular portion; and a soft conductive component attached to a surface of the elastic portion opposite to the rotating ring, and the soft conductive component can abut against a side surface of the rotating ring.

[0023] Furthermore, preferred embodiments of the present invention of the electrolytic corrosion preventing member for rolling bearings relate to the following [2] to [6].

[0024] [2] The anti-electrolytic corrosion member for a rolling bearing according to [1], wherein the annular portion is pressed against the side surface of the fixing ring in a manner interposing a spacer.

[0025] [3] The anti-electrolytic corrosion component for a rolling bearing according to [1] is characterized in that the soft conductive component is composed of at least one selected from a resin impregnation of a non-woven fabric, a non-woven fabric, a resin impregnation of a woven fabric, a woven fabric, a resin impregnation of a soft porous body, and a soft porous body.

[0026] [4] The anti-corrosion component for a rolling bearing according to [2] is characterized in that the soft conductive component is composed of at least one selected from a resin impregnation of a non-woven fabric, a non-woven fabric, a resin impregnation of a woven fabric, a woven fabric, a resin impregnation of a soft porous body, and a soft porous body.

[0027] [5] The anti-electrolytic corrosion member for a rolling bearing according to any one of [1] to [4], wherein the plurality of elastic portions of the spring plate are bent toward the rotating ring.

[0028] [6] The anti-electrolytic corrosion member for a rolling bearing according to any one of [1] to [4], wherein the plurality of elastic portions of the spring plate are formed flush with the annular portion.

[0029] Furthermore, the above-mentioned object of the present invention is achieved by the following configuration [7] of the electro-corrosion protection member for a rolling bearing.

[0030] [7] An anti-electrocorrosion component for a rolling bearing, which is attached to a rolling bearing unit having a rolling bearing so as to prevent electrocorrosion of the rolling bearing in the rolling bearing unit, wherein one ring of the rolling bearing is a fixed ring and the other ring is a rotating ring. The anti-electrocorrosion component for a rolling bearing is characterized in that it comprises: a spring plate including an annular portion and a plurality of elastic portions, and formed of a thin plate of a conductive material, wherein the plurality of elastic portions extend continuously and radially from the annular portion; and a soft conductive component attached to a surface of the elastic portion opposite to a rotating member engaged with the rotating ring, and the soft conductive component can abut against a side surface of the rotating member.

[0031] Furthermore, preferred embodiments of the present invention of the electrolytic corrosion preventing member for rolling bearings relate to the following [8] to

[12] .

[0032] [8] The anti-electrolytic corrosion member for a rolling bearing according to [7], wherein the annular portion is pressed against the side surface of the fixing ring in a manner that interposes a spacer.

[0033] [9] The anti-electrocorrosion component for a rolling bearing according to [7] is characterized in that the soft conductive component is composed of at least one selected from a resin impregnation of a non-woven fabric, a non-woven fabric, a resin impregnation of a woven fabric, a woven fabric, a resin impregnation of a soft porous body, and a soft porous body.

[0034]

[10] The anti-corrosion component for a rolling bearing according to [8] is characterized in that the soft conductive component is composed of at least one selected from a resin impregnation of a non-woven fabric, a non-woven fabric, a resin impregnation of a woven fabric, a woven fabric, a resin impregnation of a soft porous body, and a soft porous body.

[0035]

[11] The anti-electrolytic corrosion member for a rolling bearing according to any one of [7] to

[10] , wherein the plurality of elastic portions of the spring plate are bent toward the rotating ring.

[0036]

[12] The anti-electrolytic corrosion member for a rolling bearing according to any one of [7] to

[10] , wherein the plurality of elastic portions of the spring plate are formed flush with the annular portion.

[0037] The above-mentioned object of the present invention is achieved by the following

[13] structure of the anti-electrolytic corrosion rolling bearing unit.

[0038]

[13] An anti-electro-corrosion rolling bearing unit, characterized in that:

[0039] The anti-electrolytic corrosion rolling bearing unit comprises a rolling bearing, one ring of the rolling bearing is a fixed ring, and the other ring is a rotating ring, and the anti-electrolytic corrosion rolling bearing unit is attached with an anti-electrolytic corrosion component for a rolling bearing as described in any one of [1] to

[12] .

[0040] Hereinafter, the “anti-electrolytic corrosion member for rolling bearing” will be simply referred to as the “anti-electrolytic corrosion member”, and the “anti-electrolytic corrosion rolling bearing unit” will be simply referred to as the “bearing unit”.

[0041] Effects of the Invention

[0042] The anti-electrocorrosion member of the present invention is a member in which a soft conductive member attached to an elastic portion of a spring plate is brought into contact with the side surface of a rotating ring or a side surface of a rotating member. The force applied by the soft conductive member implemented by the spring plate to the side surface of the rotating ring or the side surface of the rotating member is not too large, and it is not easy to generate wear powder. In addition, the soft conductive member is made of a soft material, so the rotating ring as the counterpart member is less damaged.

[0043] In addition, there is no need to perform any processing on the rolling bearing, and there is no restriction on the type of rolling bearing. It can be applied to existing rolling bearings, so it has high versatility. Moreover, the spring plate is a thin plate, which can minimize the increase in the space of the attached bearing unit.

[0044] The bearing unit of the present invention is equipped with the anti-electro-corrosion component of the present invention, so it can suppress the generation of wear powder and damage to the other component, and it has high versatility and does not cause an increase in space. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 An example of an electro-corrosion prevention member according to a first embodiment of the present invention applied to an inner ring rotating type bearing unit is shown. Figure 1 (A) is a top view of the anti-corrosion component, Figure 1 (B) is Figure 1 The A-A section view of (A), Figure 1 (C) means Figure 1 An enlarged view of the annular portion and the bent portion of the elastic portion in (B).

[0046] Figure 2 It means that the connection is Figure 1 A cross-sectional view of an example of a bearing unit of an anti-corrosion member is shown.

[0047] Figure 3 It means in Figure 2 FIG. 4 is a diagram showing a state in which the anti-electrolytic corrosion member is pressed against the outer ring by the pressing member.

[0048] Figure 4 An example of an electro-corrosion prevention member according to a second embodiment of the present invention applied to an outer ring rotating type bearing unit is shown. Figure 4 (A) is a top view of the anti-corrosion component, Figure 4 (B) is Figure 4 A-A section view of (A).

[0049] Figure 5 It means that the connection is Figure 4 A cross-sectional view of an example of a bearing unit of an anti-corrosion member is shown.

[0050] Figure 6 It means in Figure 5 FIG. 4 is a diagram showing a state in which the anti-electrolytic corrosion member is pressed against the inner ring by the pressing member.

[0051] Figure 7 This is a cross-sectional view showing an example of an inner ring rotation type bearing unit to which an electric corrosion preventing member according to a third embodiment of the present invention is attached.

[0052] Figure 8 This is a cross-sectional view showing an example of an inner ring rotation type bearing unit to which another electric corrosion preventing member according to the third embodiment of the present invention is attached.

[0053] Fig. 9This is a cross-sectional view showing an example of an outer ring rotation type bearing unit to which an electric corrosion prevention member according to a fourth embodiment of the present invention is attached.

[0054] Fig.10 This is a cross-sectional view showing an example of an outer ring rotation type bearing unit to which another electric corrosion prevention member according to the fourth embodiment of the present invention is attached.

[0055] Fig.11 The anti-corrosion member of the modified example of the present invention is Figure 1 (B) corresponds to the cross-sectional view.

[0056] Fig.12 It means that the connection is Fig.11 A cross-sectional view of an example of a bearing unit of an anti-corrosion member is shown.

[0057] Description of Reference Numerals

[0058] 1A, 1B: Anti-electro-corrosion components;

[0059] 10A, 10B: spring plate;

[0060] 11A, 11B: annular portion;

[0061] 12A: inner diameter side end;

[0062] 12B: outer diameter side end;

[0063] 13A, 13B: elastic part;

[0064] 14A: Peripheral end face;

[0065] 14B: Inner peripheral end face;

[0066] 15A, 15B: gap;

[0067] 20: Soft conductive components;

[0068] 30: spacer;

[0069] 50: bearing;

[0070] 51: outer ring;

[0071] 51a, 52a: side view;

[0072] 52: inner circle;

[0073] 53: rolling element;

[0074] 54: cage;

[0075] 60: axis;

[0076] 65: rotating member;

[0077] 70: base body;

[0078] 75: fixed component;

[0079] 80: pressing member;

[0080] 100A, 100B: Bearing unit. DETAILED DESCRIPTION

[0081] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiments described below, and can be arbitrarily modified and implemented within the scope of the present invention.

[0082] (First embodiment: an electro-corrosion preventing member for inner ring rotation and a bearing unit)

[0083] Figure 1 An example of an anti-electrolytic corrosion member according to the present invention is shown, in which the rotating ring is applied to the inner ring. Figure 1 (A) is a top view of the anti-corrosion component, Figure 1 (B) is Figure 1 The A-A section view of (A), Figure 1 (C) means Figure 1 (B) is an enlarged view of the annular portion and the bent portion of the elastic portion. Figure 2 is a cross-sectional view showing an example of a bearing unit of the present invention, but with Figure 1 The anti-galvanic corrosion component shown.

[0084] like Figure 1 As shown, the inner ring rotation anti-corrosion member 1A includes a spring plate 10A, which includes an annular portion 11A and a plurality of elastic portions 13A, which are bent at the inner diameter side end 12A of the annular portion 11A and extend radially toward the center of the annular portion 11A. Figure 2 As shown, when the elastic portion 13A is attached to the bearing unit 100A, it is bent toward the right side in the figure so as to face the inner ring 52 of the rolling bearing 50. In addition, notches 15A are formed on both sides of the bent portion between the elastic portion 13A and the annular portion 11A to maintain the bent state of the elastic portion 13A.

[0085] The entire spring plate 10A is made of a thin plate made of a conductive material such as metal. When the conductive material is metal, stainless steel is preferred for reasons such as easy processing and less rust.

[0086] A soft conductive member 20 is attached to the surface of each elastic portion 13A facing the inner ring 52 of the rolling bearing 50, and the spring plate 10A and the soft conductive member 20 constitute the electrolytic corrosion prevention member 1A. The soft conductive member 20 is attached to the elastic portion 13A using an adhesive.

[0087] The soft conductive component 20 is a component in which a conductive material is mixed or carried in a soft base material. As the soft base material, porous bodies such as paper, cloth, non-woven fabrics, resin sheets, etc. can be used. As the conductive material, metal fibers, metal crushed materials, and metal powders of silver, copper, gold, aluminum, stainless steel, etc., or conductive carbon fibers, conductive carbon crushed materials, and conductive carbon powders can be listed. In addition, the soft conductive component can also use a commercially available component called a "conductive sheet". Among them, the soft conductive component is preferably composed of at least one selected from a resin impregnation of a non-woven fabric, a resin impregnation of a non-woven fabric, a woven fabric, a resin impregnation of a soft porous body such as a sponge, and a soft porous body such as a sponge.

[0088] In addition, if Figure 1 As shown in (C), the bending angle θ between the annular portion 11A and the elastic portion 13A is appropriately set according to the length (L) of the elastic portion 13A and the size of the soft conductive member 20, so that the soft conductive member 20 abuts against the side surface 52a of the inner ring 52 of the rolling bearing 50 when attached to the bearing unit 100A. The bending angle θ can also adjust the force applied by the soft conductive member 20 to the side surface 52a of the inner ring 52 of the rolling bearing 50. By reducing the bending angle θ, the applied force can be increased, and conversely, by increasing the bending angle θ, the applied force can be reduced.

[0089] It should be noted that the plane shape of the soft conductive member 20 is not limited except that it can be Figure 1 In addition to the fan-shaped shape shown in (A), it can also be a rectangle. In addition, it can also be a plurality of small pieces.

[0090] like Figure 2 As shown, the rolling bearing 50 is mounted Figure 1 The anti-electro-corrosion component 1A shown in the figure constitutes the bearing unit 100A, but there is no limitation on the rolling bearing 50. Between the outer ring 51 and the inner ring 52, a plurality of rolling elements (balls) 53 are held by a retainer 54 so as to roll freely. The rolling bearing 50 is lubricated by a lubricating oil or grease composition. Here, the rotating ring is the inner ring 52, and a shaft 60 directly connected to a motor not shown is embedded therein. In addition, the outer ring 51 is a fixed ring fixed to the seat body 70.

[0091] In addition, in this embodiment, if Figure 3As shown, the annular portion 11A of the anti-electrolytic corrosion member 1A is pressed against the side surface of the outer ring 51 via the conductive spacer 30 by the conductive pressing member 80. The spacer 30 may be set to a thickness that takes into account the pressing amount of the spring plate 10A, the thickness of the soft conductive member 20, etc. In addition, the annular portion 11A of the anti-electrolytic corrosion member 1A may be directly abutted against the side surface of the outer ring 51 without providing the spacer 30.

[0092] In such an inner ring rotation type bearing unit 100A, usually, the current from the motor flows to the inner ring 52 via the shaft 60, and energizes the rolling elements 53 and the outer ring 51 inside the bearing, so that the rolling bearing 50 is electrolytically corroded. Therefore, in the present invention, the electrolytic corrosion prevention member 1A is attached to the seat body 70 in such a manner that the soft conductive member 20 abuts against the side surface 52a of the inner ring 52. In addition, the annular portion 11A of the spring plate 10A is in electrical contact with the side surface of the outer ring 51 via the conductive spacer 30, and is also in electrical contact with the conductive pressing member 80.

[0093] As a result, the current from the shaft 60 will flow from the soft conductive component 20 to the elastic portion 13A and the annular portion 11A of the spring plate 10A via the inner ring 52, and will flow to the seat body 70 via the outer peripheral end surface 14A of the annular portion 11A, the pressing component 80, the spacer 30 and the outer ring 51. Therefore, no electricity will be passed through the inside of the bearing, and no electrical corrosion will occur in the rolling bearing 50.

[0094] It should be noted that the contact area between the outer ring 51 and the seat body 70 is large, so the current flowing to the outer ring 51 does not pass through the rolling element 53 but flows to the seat body 70 .

[0095] In addition, in the present embodiment, the outer peripheral end surface 14A of the annular portion 11A and the spacer 30 abut against the seat body 70, but it is also possible to have a configuration in which the outer peripheral end surface 14A of the annular portion 11A and the spacer 30 do not abut against the seat body 70 but are clamped by the pressing member 80 between the pressing member 80 and the outer ring 51. In this case, the current flowing to the annular portion 11A flows to the seat body 70 via the outer ring 51 and the pressing member 80.

[0096] Furthermore, the pressing member 80 may not be provided, and the annular portion 11A of the electrolytic corrosion protection member 1A may be directly pressed against the side surface of the outer ring 51 via the conductive spacer 30 and abutted against the seat body 70 for fixation.

[0097] Furthermore, since the side surface 52 a of the inner ring 52 is in contact with the soft conductive member 20 , the side surface 52 a of the inner ring 52 is not damaged, and a decrease in the rotation torque of the inner ring 52 can be suppressed.

[0098] Furthermore, the base material of the soft conductive member 20 is a porous body, which has oil absorption and oil retention properties. Therefore, between the adjacent spring plates 10A, when the shaft rotates, the oil is easily discharged and an oil film is not easily formed. Therefore, even when used in oil, the conductivity is good. It should be noted that by making the base material of the soft conductive member 20 a porous body, even when used in an environment other than an oil environment, the friction coefficient can be suppressed, and the rotation torque of the inner ring 52 can be suppressed from decreasing.

[0099] Furthermore, the spring plate 10A of the anti-electrolytic corrosion member 1A is a thin plate, which can minimize the increase in the space of the bearing unit 100A. In addition, since there is no restriction on the rolling bearing 50 and no processing is required, it can be applied to existing rolling bearings and has high versatility.

[0100] By increasing the contact area between the soft conductive member 20 of the anti-electrocorrosion member 1A and the side surface 52a of the inner ring 52 of the rolling bearing 50, the electric corrosion of the rolling bearing 50 can be more effectively prevented. The spring plate 10A is made of a bent thin plate as a whole and is an elastic member. Therefore, by pressing the annular portion 11A of the anti-electrocorrosion member 1A toward the outer ring 51, the elastic force generated by the pressing acts on the elastic portion 13A. Figure 1 The elastic portion 13A is stretched so that the bending angle θ shown in (C) becomes larger, and the elastic portion 13A as a whole moves toward the rolling bearing 50 side. Figure 2 The portion of the soft conductive member 20 that is away from the side surface 52 a of the inner ring 52 also moves toward the rolling bearing 50 , and substantially the entire soft conductive member 20 comes into contact with the side surface 52 a of the inner ring 52 .

[0101] (Second embodiment: an anti-electrolytic corrosion member for outer ring rotation and a bearing unit)

[0102] In the above description, the case where the inner ring 52 of the rolling bearing 50 is a rotating ring is described, but the outer ring 51 may be a rotating ring. Figure 4 This is a diagram showing an anti-corrosion component for outer ring rotation. Figure 4 (A) is a top view of the anti-corrosion component, Figure 4 (B) is Figure 4 A-A section view of (A). In addition, Figure 5 Shown is a Figure 4 The bearing unit of the anti-corrosion component is shown.

[0103] like Figure 4 As shown, the anti-corrosion member 1B for outer ring rotation has a spring plate 10B, which includes an annular portion 11B and a plurality of elastic portions 13B, which are bent at the outer diameter side end 12B of the annular portion 11B and extend radially from the center of the annular portion 11B toward the periphery. Figure 5As shown, the elastic portion 13B is bent toward the right side in the figure so as to face the outer ring 51 of the rolling bearing 50 when attached to the bearing unit 100B. In addition, arc-shaped notches 15B are formed on both sides of the bent portion between the elastic portion 13B and the annular portion 11B.

[0104] A soft conductive member 20 is attached to the surface of each elastic portion 13B facing the outer ring 51 of the rolling bearing 50, and the spring plate 10B and the soft conductive member 20 constitute the anti-electrolytic corrosion member 1B. The soft conductive member 20 is the same as the soft conductive member 20 of the anti-electrolytic corrosion member 1A, and its description is omitted.

[0105] The bearing unit 100B is equipped with an anti-corrosion component 1B, such as Figure 5 As shown, in the rolling bearing 50, the inner ring 52 is fixed to the fixed member 75, and the rotating member 65 is attached to the outer ring 51. Therefore, the electric corrosion prevention member 1B is attached to the fixed member 75 so that the soft conductive member 20 abuts against the side surface 51a of the outer ring 51.

[0106] Although the current from the motor (not shown) that drives the rotating member 65 will flow to the outer ring 51, the current will flow from the soft conductive member 20 to the elastic portion 13B and the annular portion 11B of the spring plate 10B via the outer ring 51, and flow to the fixing member 75 via the inner circumferential end surface 14B of the annular portion 11B, the pressing member 80, the spacer 30 and the inner ring 52. Therefore, no electricity will be passed through the inside of the bearing and no electrical corrosion will occur in the rolling bearing 50.

[0107] In addition, if Figure 6 As shown, by pressing the annular portion 11B of the anti-electrolytic corrosion member 1B toward the inner ring 52 using the pressing member 80 to increase the contact area between the soft conductive member 20 and the side surface 51a of the outer ring 51, the electrolytic corrosion of the rolling bearing 50 can be more effectively prevented.

[0108] In addition, in the present embodiment, the spacer 30 may not be provided, and the annular portion 11B of the electrolytic corrosion preventing member 1B may be directly in contact with the side surface of the inner ring 52 .

[0109] The inner peripheral end surface 14B of the annular portion 11B and the spacer 30 may abut against the fixing member 75 , or may be sandwiched between the pressing member 80 and the inner ring 52 without abutting against the fixing member 75 .

[0110] (Third Embodiment: Anti-electrolytic Corrosion Member for Inner Ring Rotation and Bearing Unit)

[0111] Figure 7The present invention shows a case where the anti-corrosion member is attached to a bearing unit whose rotating ring is the inner ring, similarly to the first embodiment. In this case, the rotating member, i.e., the shaft 60, which is fitted with the inner ring 52, has a stepped surface 60c having a smaller diameter than the fitting surface 60b with which the inner ring 52 is fitted.

[0112] The soft conductive member 20 of the spring plate 10A is attached to the surface of the elastic portion 13A that is axially opposed to the shaft 60, specifically, to the surface of the elastic portion 13A that is opposed to the side surface 60a between the fitting surface 60b and the step surface 60c that are fitted with the inner ring 52, so that the soft conductive member 20 can abut against the side surface 60a of the shaft 60, so as to elastically deform the elastic portion 13A.

[0113] In such an inner ring rotation type bearing unit 100A, the anti-electrolytic corrosion member 1A is attached to the seat body 70 in such a manner that the soft conductive member 20 abuts against the side surface 60a of the shaft 60. In addition, the annular portion 11A of the spring plate 10A is in electrical contact with the side surface of the outer ring 51 via the conductive spacer 30, and is also in electrical contact with the end surface of the flange portion 71 of the seat body 70.

[0114] As a result, the current from the shaft 60 will flow from the soft conductive component 20 to the elastic portion 13A and the annular portion 11A of the spring plate 10A via the side surface 60a of the shaft 60, and flow to the seat body 70 or directly to the seat body 70 via the outer peripheral end surface 14A of the annular portion 11A, the spacer 30 and the outer ring 51, so that no electricity will be passed through the inside of the bearing and no electrical corrosion will occur in the rolling bearing 50.

[0115] This embodiment is different from the first embodiment in that the anti-electrocorrosion component 1A does not contact the side surface 52a of the inner ring 52, so that an elastic retaining ring or the like can be attached, thereby increasing the design freedom of the rolling bearing. In addition, in this embodiment, the anti-electrocorrosion component and the rolling bearing are separated in position, so that the lubrication environment of each can be controlled separately. For example, only the anti-electrocorrosion component can be made into a dry environment, or the amount of oil lubrication can be increased or decreased in the anti-electrocorrosion component and the rolling bearing.

[0116] In particular, Figure 7 In the bearing unit 100A shown in the figure, the diameter of the position where the soft conductive member 20 contacts the side surface 60a of the shaft 60 is as follows: Figure 3 Since the diameter of the position in contact with the side surface 52a of the inner ring 52 shown is small, the peripheral speed of the side surface 60a of the shaft 60 can be reduced, and the generation of wear powder and drag loss can be further suppressed.

[0117] It should be noted that if Figure 8 As shown, in the present embodiment, the shaft 60 may be provided with a flange portion 62 protruding from the fitting surface 60 b toward the outer diameter side, and the soft conductive member 20 may be brought into contact with the side surface 60 a of the flange portion 62 .

[0118] (Fourth Embodiment: Anti-electrolytic Corrosion Member for Outer Ring Rotation and Bearing Unit)

[0119] Fig. 9 The case where the anti-corrosion member is attached to the bearing unit whose rotating ring is the outer ring is shown in the second embodiment. In this case, the rotating member 65 fitted with the outer ring 51 has a stepped surface 65c having a larger diameter than the fitting surface 65b fitted with the outer ring 51.

[0120] The soft conductive member 20 of the spring plate 10B is attached to the surface of the elastic portion 13B that is axially opposed to the rotating member 65, specifically, to the surface of the elastic portion 13B that is opposed to the side surface 65a between the fitting surface 65b and the step surface 65c that the outer ring 51 fits, so that the elastic portion 13B is elastically deformed. Therefore, the soft conductive member 20 can abut against the side surface 65a of the rotating member 65.

[0121] In such an outer ring rotary bearing unit 100B, the anti-electrolytic corrosion member 1B is attached to the fixed member 75 in such a manner that the soft conductive member 20 abuts against the side surface 65a of the rotating member 65. In addition, the annular portion 11B of the spring plate 10B is in electrical contact with the side surface of the inner ring 52 via the conductive spacer 30, and is also in electrical contact with the end surface of the flange portion 76 of the fixed member 75.

[0122] As a result, the current from the motor (not shown) that drives the rotating member 65 will flow from the soft conductive member 20 to the elastic portion 13B and the annular portion 11B of the spring plate 10B via the side surface 65a of the rotating member 65, and flow to the fixed member 75 or directly to the fixed member 75 via the inner circumferential end surface 14B of the annular portion 11B, the spacer 30 and the inner ring 52, so that no electricity will be passed through the inside of the bearing and no electrical corrosion will occur in the rolling bearing 50.

[0123] In this embodiment, unlike the second embodiment, the anti-electrocorrosion component 1B does not contact the side surface 51a of the outer ring 51, so an elastic retaining ring or the like can be attached, thereby increasing the design freedom of the rolling bearing. In addition, in this embodiment, the anti-electrocorrosion component and the rolling bearing are separated in position, so the lubrication environment of each can be controlled separately. For example, only the anti-electrocorrosion component can be made into a dry environment or the amount of oil lubrication can be increased or decreased in the anti-electrocorrosion component and the rolling bearing.

[0124] It should be noted that if Fig.10 As shown, in this embodiment, the rotating member 65 may be provided with a flange portion 67 protruding from the fitting surface 65 b toward the inner diameter side, and the soft conductive member 20 may be brought into contact with the side surface 65 a of the flange portion 67 .

[0125] In particular, Fig.10In the bearing unit 100B shown in the figure, the diameter of the position where the soft conductive member 20 contacts the side surface 65a of the rotating member 65 is as follows: Figure 6 Since the diameter of the position in contact with the side surface 51 a of the outer ring 51 shown is small, the peripheral speed of the side surface 65 a of the rotating member 65 can be reduced, and the generation of wear powder and drag loss can be further suppressed.

[0126] It should be noted that the present invention is not limited to the above-mentioned embodiments, and appropriate modifications and improvements can be made.

[0127] For example, in the above-mentioned embodiment, the multiple elastic parts 13A and 13B of the spring plates 10A and 10B are bent toward the rotating circle, but it is also possible to form a structure that is not bent at the inner diameter side end 12A and the outer diameter side end 12B but is formed flush with the annular parts 11A and 11B. Fig.11 As shown, for example, in the case of an inner ring rotation anti-corrosion member 1A, the annular portion 11A and the elastic portion 13A are linearly continuous in a side view.

[0128] Therefore, in Fig.12 In the bearing unit 100A shown, when the annular portion 11A of the anti-electrocorrosion member 1A is clamped between the flange portion 71 of the seat body 70 and the side surface of the outer ring 51, the elastic portion 13A of the anti-electrocorrosion member 1A elastically deforms by the thickness of the soft conductive member 20, and the soft conductive member 20 is brought into contact with the side surface of the inner ring 52 by the bending reaction force of the spring plate 10A. Thus, the same function as the above-mentioned embodiment can be achieved.

[0129] In this case, since the spring plate 10A does not need to be bent, the electrolytic corrosion preventing member 1A can be manufactured at low cost, and the spring plate 10A and the soft conductive member 20 can be easily bonded.

[0130] Furthermore, in the present embodiment, the spring plate has a structure including a plurality of elastic portions extending radially toward the center of the annular portion, but may also have a structure including a single elastic portion extending toward the center of the annular portion.

Claims

1. An anti-electrocorrosion member for a rolling bearing, which is attached to a rolling bearing unit having a rolling bearing so as to prevent the electric corrosion of the rolling bearing in the rolling bearing unit, wherein one ring of the rolling bearing is a fixed ring and the other ring is a rotating ring, and the anti-electrocorrosion member for a rolling bearing is characterized in that it comprises: A spring plate, comprising a circular ring portion and a plurality of elastic portions, wherein the spring plate is formed of a thin plate of a conductive material, and the plurality of elastic portions extend continuously and radially from the circular ring portion; and A soft conductive member is attached to the surface of the elastic part that is opposite to the rotating circle. Furthermore, the soft conductive component can abut against a side surface of the rotating ring.

2. The anti-electro-corrosion member for a rolling bearing according to claim 1, characterized in that: The annular portion is pressed against the side surface of the fixing ring in a manner of sandwiching a spacer.

3. The anti-electro-corrosion member for a rolling bearing according to claim 1, characterized in that: The soft conductive member is composed of at least one selected from a nonwoven fabric impregnated with resin, a nonwoven fabric, a woven fabric impregnated with resin, a woven fabric, a soft porous body impregnated with resin, and a soft porous body.

4. The anti-electro-corrosion member for a rolling bearing according to claim 2, characterized in that: The soft conductive member is composed of at least one selected from a nonwoven fabric impregnated with resin, a nonwoven fabric, a woven fabric impregnated with resin, a woven fabric, a soft porous body impregnated with resin, and a soft porous body.

5. The anti-electro-corrosion member for a rolling bearing according to claim 1, characterized in that: The plurality of elastic portions of the spring plate are bent toward the rotating ring.

6. The anti-electro-corrosion member for a rolling bearing according to claim 1, characterized in that: The plurality of elastic portions of the spring plate are formed to be flush with the annular portion.

7. An anti-electrocorrosion component for a rolling bearing, which is attached to a rolling bearing unit having a rolling bearing so as to prevent the electric corrosion of the rolling bearing in the rolling bearing unit, wherein one of the rings of the rolling bearing is a fixed ring and the other ring is a rotating ring, and the anti-electrocorrosion component for a rolling bearing is characterized in that it has: A spring plate, comprising a circular ring portion and a plurality of elastic portions, wherein the spring plate is formed of a thin plate of a conductive material, and the plurality of elastic portions extend continuously and radially from the circular ring portion; and A soft conductive member is attached to a surface of the elastic portion that is opposite to the rotating member engaged with the rotating ring. Furthermore, the soft conductive member can abut against a side surface of the rotating member.

8. The anti-electro-corrosion member for a rolling bearing according to claim 7, characterized in that: The annular portion is pressed against the side surface of the fixing ring in a manner of sandwiching a spacer.

9. The anti-electro-corrosion member for a rolling bearing according to claim 7, characterized in that: The soft conductive member is composed of at least one selected from a nonwoven fabric impregnated with resin, a nonwoven fabric, a woven fabric impregnated with resin, a woven fabric, a soft porous body impregnated with resin, and a soft porous body.

10. The anti-electro-corrosion member for a rolling bearing according to claim 8, characterized in that: The soft conductive member is composed of at least one selected from a nonwoven fabric impregnated with resin, a nonwoven fabric, a woven fabric impregnated with resin, a woven fabric, a soft porous body impregnated with resin, and a soft porous body.

11. The anti-electro-corrosion member for a rolling bearing according to claim 7, characterized in that: The plurality of elastic portions of the spring plate are bent toward the rotating ring.

12. The anti-electro-corrosion member for a rolling bearing according to claim 7, characterized in that: The plurality of elastic portions of the spring plate are formed to be flush with the annular portion.

13. An anti-electro-corrosion rolling bearing unit, characterized in that: The anti-electrolytic corrosion rolling bearing unit includes a rolling bearing, one of the bearing rings of the rolling bearing is a fixed ring, and the other bearing ring is a rotating ring. Furthermore, the anti-electrolytic corrosion member for a rolling bearing according to any one of claims 1 to 12 is attached to the anti-electrolytic corrosion rolling bearing unit.

Images