JP2012219988A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing in which a coating material is prevented from adhering to peripheries of sliding contact parts of seal members in electrodeposition coating.SOLUTION: The rolling bearing 3 includes: an inner ring 31 fixed to an electropainted first support member 25 and having an inner raceway surface 31a; an outer ring 33 having an outer raceway surface 33a opposing to the inner raceway surface 31a; a plurality of rolling elements 32 disposed between the inner raceway surface 31a and the outer raceway surface 33a; and the seal members 35, 36 suppressing leakage of 3 g of grease filled between the inner ring 31 and the outer ring 33. In the seal member 35, 36, an end on the inner peripheral side is fixed to the inner ring 31 so that a lip part 352a provided on the outer peripheral side is brought into sliding contact with the outer ring 33. Thus, electric short between the sliding contact parts 33b, 33c coming into sliding contact with the seal members 35, 36 of the outer ring 33 and the first support member 25 is suppressed.

Description

  The present invention relates to a rolling bearing attached to a conductive member to be electrodeposited.

  Conventionally, a sliding door that is opened and closed by sliding in the front-rear direction along a guide rail provided on a side surface of the vehicle is known. This type of sliding door is provided with a roller having a rolling bearing structure in order to support the weight of the sliding door and to make the sliding smooth (see Patent Document 1).

  A sliding door for a vehicle is generally subjected to electrodeposition coating in order to form a coating film having a uniform film thickness. Electrodeposition coating is a coating method in which static electricity having a different polarity is applied to the paint and the object to be coated so that the paint adheres to the object to be coated. In cationic electrodeposition coating, which is a type of electrodeposition coating, the object to be coated is immersed in the electrodeposition paint, the object to be coated is used as the cathode, and the electrode plate installed in the electrodeposition tank is used as the anode. By this, a coating film is deposited on the object side.

  This electrodeposition coating avoids scratching the painted surface during the work of adjusting the mounting position of the guide rail to the vehicle body so that the sliding door opens and closes smoothly. This is performed in a state where a roller is assembled to the door body. For this reason, the roller is also electrodeposited together with the slide door body. In the coating method described in Patent Document 1, in order to prevent the smooth rotation of the roller from being disturbed by the opening and closing of the sliding door after electrodeposition coating, the coating film on the rolling surface of the guide rail and the roller is uneven. The guide rails are masked during electrodeposition coating, and the rollers are replaced after electrodeposition coating.

JP 2002-316092 A

  However, in this coating method, the number of man-hours can be increased by replacing the rollers after electrodeposition coating, and the environmental load and cost can be increased due to the disposal of the replaced rollers. Further, in this type of roller, the rotation of the rotating member that rolls along with the movement of the slide door may be hindered by solidification of the paint adhering to the inner member. For example, a commonly used rolling bearing is provided with a seal member that is in sliding contact with the inner ring and prevents leakage of grease filled therein, and paint adheres around the contact portion between the seal member and the inner ring. Then, the seal member is fixed to the inner ring, and the rotation of the seal member and the outer ring to which the seal member is fixed is hindered.

  Accordingly, an object of the present invention is to provide a rolling bearing capable of suppressing the adhesion of paint to the periphery of the sliding contact portion of the seal member in electrodeposition coating.

  In order to achieve the above object, the present invention provides the following rolling bearings [1] to [5].

[1] An inner ring fixed to a conductive member to be electrodeposited and having an inner raceway surface, an outer ring having an outer raceway surface facing the inner raceway surface, and between the inner raceway surface and the outer raceway surface A plurality of rolling elements disposed on the outer ring, and a seal member that suppresses leakage of grease sealed between the inner ring and the outer ring, and the end of the outer peripheral side of the seal member slides on the outer ring. A rolling bearing in which an end portion on an inner peripheral side is fixed to the inner ring so as to come into contact, and an electrical short circuit with the conductive member is suppressed at a sliding contact portion that is in sliding contact with the seal member of the outer ring.

[2] The rolling bearing according to [1], wherein the plurality of rolling elements are made of a material having higher electric resistance than the material of the inner ring.

[3] The rolling bearing according to [2], wherein the plurality of rolling elements are insulating ceramics.

[4] The rolling bearing according to any one of [1] to [3], wherein the grease is an insulating fluorine-based grease.

[5] The conductive member is a support provided on a slide door body that is opened and closed with respect to the door opening of the vehicle body by moving in the front-rear direction of the vehicle along a rail formed on a side surface of the vehicle body. The rolling bearing according to any one of [1] to [4], wherein the outer ring is a member and rolls along the rail as the slide door body moves.

  ADVANTAGE OF THE INVENTION According to this invention, adhesion of the coating material to the periphery of the sliding contact part of the sealing member in electrodeposition coating can be suppressed.

FIG. 1 is a diagram showing a sliding door for a vehicle and a part of a vehicle body according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a configuration example of the center guide rail and the center roller unit. FIG. 3 is a cross-sectional view showing a configuration example of the rolling bearing and its peripheral portion. FIG. 4 is a partially enlarged cross-sectional view showing a configuration example of the seal member and its peripheral portion.

[Embodiment]
Hereinafter, an exemplary embodiment of the present invention will be described with reference to the drawings. In addition, about the component which is common in each drawing, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

  FIG. 1 is a diagram showing a sliding door for a vehicle and a part of a vehicle body according to an embodiment of the present invention.

  The vehicle 1 includes a vehicle body 10 and a slide door 2 that can open and close a door opening 10 a formed in the vehicle body 10. The slide door 2 includes a slide door main body 20, a center roller unit 21, an upper roller unit 22, and a lower roller unit 23 for smoothly opening and closing the slide door main body 20.

  On the left side surface of the vehicle body 10, there are a center guide rail 11 for guiding the movement of the slide door body 20 in the front-rear direction, an upper guide rail 12 provided on the upper side of the door opening 10a, and a lower side of the door opening 10a. A provided lower guide rail 13 is provided. The center roller unit 21 is guided by the center guide rail 11, and an outer ring of a rolling bearing described later rolls. Further, the upper roller unit 22 is guided by the upper guide rail 12, and the lower roller unit 23 is guided by the lower guide rail 13, and the respective roller members 221 and 231 roll.

  The sliding door body 20 is opened and closed with respect to the door opening 10 a by moving in the front-rear direction of the vehicle 1 along the center guide rail 11, the upper guide rail 12, and the lower guide rail 13.

  FIG. 2 is a schematic diagram illustrating a configuration example of the center guide rail 11 and the center roller unit 21.

  A main arm 24 fixed to the slide door main body 20 is provided inside the slide door main body 20 (side facing the center guide rail 11), and the first sub arm 251 and the second sub arm 261 rotate around the main arm 24. It is linked movably.

  A shaft-shaped first stay 252 that protrudes toward the vehicle body 10 is fixed to the first sub arm 251 by, for example, press-fitting. The first sub arm 251 and the first stay 252 are conductive members made of a metal material such as carbon steel. The first sub arm 251 and the first stay 252 constitute a first support member 25 that supports the rolling bearing 3.

  In addition, a pair of second stays 262 (only one is shown in FIG. 2) protruding upward from the vehicle 1 are fixed to the second sub-arm 261. The pair of second stays 262 support a pair of rolling bearings 4 (only one is shown in FIG. 2) having a smaller diameter than the rolling bearing 3. The second sub arm 261 and the pair of second stays 262 are conductive members made of a metal material such as carbon steel, and constitute a second support member 26 that supports the pair of rolling bearings 4.

  The center guide rail 11 is provided in a recess formed on the left side surface of the vehicle body 10. The center guide rail 11 has a first rail 111 for rolling the rolling bearing 3 and a second rail 112 for rolling the pair of rolling bearings 4. The upper surface 111 a of the first rail 111 is formed as a rolling surface that guides the rolling bearing 3. The first rail 111 is formed so as to extend in the front-rear direction of the vehicle 1 so that a sliding operation is possible while supporting the weight of the slide door body 20.

  The second rail 112 is formed in a concave shape that opens below the vehicle 1, restricts the movement of the slide door body 20 in the thickness direction (left-right direction in FIG. 2), and the slide door body 20 is at an appropriate distance from the vehicle body 10. It is configured to slide while maintaining.

  The center guide rail 11 is fixed to the vehicle body 10 by bolts 113. A cover member 110 that covers a part of the center guide rail 11 is provided at the opening of the recess of the vehicle body 10 in which the center guide rail 11 is accommodated.

  FIG. 3 is a cross-sectional view showing a configuration example of the rolling bearing 3 and its peripheral part. In addition, about the rolling bearing 4, since it can comprise similarly to the rolling bearing 3, description is abbreviate | omitted.

  The rolling bearing 3 is disposed between the inner ring 31 fixed to the first stay 252 of the first support member 25 so as not to rotate, the outer ring 33 coaxially rotatable with the inner ring 31, and the inner ring 31 and the outer ring 33. And a plurality of rolling elements 32. In the present embodiment, the rolling element 32 is formed in a spherical shape. Further, the inner ring 31 is caulked and fixed to an annular recess 252 a formed in the first stay 252.

  An arcuate inner raceway surface 31 a on which a plurality of rolling elements 32 roll is formed at the axial center portion of the outer peripheral surface of the inner ring 31. In addition, an arc-shaped outer raceway surface 33 a on which the plurality of rolling elements 32 roll is formed at the center portion in the axial direction on the inner peripheral surface of the outer ring 33. The inner raceway surface 31 a and the outer raceway surface 33 a face each other in the radial direction of the rolling bearing 3.

  A synthetic resin covering member 331 is fixed to the outer peripheral side of the outer ring 33 so as to cover the entire outer peripheral surface 33 d of the outer ring 33. The covering member 331 is provided to make the sliding operation of the sliding door body 20 smooth and quiet. However, the covering member 331 is not always necessary, and the outer peripheral surface 33d of the outer ring 33 directly contacts the upper surface 111a of the first rail 111. The center guide rail 11 may be configured to roll.

  Further, the rolling bearing 3 includes a cage 34 that holds a plurality of rolling elements 32 at a regular interval. A plurality of holding holes having a curved inner surface along the outer surface of the rolling element 32 are formed in the cage 34, and the plurality of rolling elements 32 are held in the plurality of holding holes, respectively.

  Between the inner ring 31 and the outer ring 33, grease 3g for smoothly rolling the plurality of rolling elements 32 is enclosed. Moreover, the rolling bearing 3 has a pair of seal members 35 and 36 for suppressing the leakage of the grease 3g to the outside. The space between the inner raceway surface 31a and the outer raceway surface 33a is shielded from the outside by the pair of seal members 35 and 36.

  Fixing portions 31b and 31c for fixing the seal members 35 and 36 are provided at both end portions in the axial direction on the outer peripheral portion of the inner ring 31. The fixing portions 31b and 31c are annular recesses formed so that the outer peripheral surface of the inner ring 31 is recessed inward in the radial direction. The end portions on the inner peripheral side of the seal members 35 and 36 are attached to the fixing portions 31b and 31c, and are fixed to the inner ring 31 in a non-rotatable manner by, for example, an elastic force generated by elastic deformation of the seal members 35 and 36.

  On the other hand, on both end portions in the axial direction on the inner peripheral portion of the outer ring 33, sliding members 33b and 33c are provided which are slidably contacted, that is, slidably contacting each other while being slidably contacted. The sliding contact portions 33b and 33c are opposed to the fixing portions 31b and 31c of the inner ring 31 in the radial direction.

  FIG. 4 is a cross-sectional view showing a detailed configuration example of the seal member 35 and its peripheral portion. The seal member 36 is configured symmetrically with the seal member 35.

  The seal member 35 includes a metal cored bar 351 and a rubber-like elastic body 352 in close contact with the cored bar 351. The elastic body 352 is integrated with the metal core 351 by, for example, vulcanization adhesion. Further, the elastic body 352 has a lip portion 352a that is elastically deformed and contacts the sliding contact portion 33c of the outer ring 33 at the outer peripheral end portion.

  The seal member 35 is fixed to the inner ring 31 at a fixed portion 35a which is an end portion on the inner peripheral side thereof. More specifically, the seal member 35 is mounted so that the fixed portion 35a is fitted into the fixed portion 31c from one side in the axial direction of the inner ring 31, and the seal groove inlet portion 31d of the inner ring 31 and the elasticity of the seal members 35 and 36 are fitted. It is fixed by the tension of deformation.

  The inner ring 31 and the outer ring 33 are made of a conductive metal. As this metal, for example, a bearing steel can be used, and more specifically, a high carbon chromium bearing steel (SUJ2) defined in JIS G4805 can be used. Although the material of the holder | retainer 34 is not specifically limited, For example, a copper alloy can be used.

  The rolling bearing 3 according to the present embodiment has a configuration for suppressing an electrical short circuit between the first stay 252 to which the inner ring 31 is fixed and the sliding contact portions 33b and 33c of the outer ring 33. Yes. Suppression of this short circuit is realizable by forming the rolling element 32 from a nonconductor, for example. In the present embodiment, the rolling element 32 is formed of a material having higher electrical resistance than the material of the inner ring 31 and the outer ring 33.

As a material of such a rolling element 32, for example, an insulating ceramic can be used. More specifically, ceramics mainly composed of Si ₃ N ₄ (silicon nitride) can be applied. The electric resistance of the rolling element 32 is desirably high, and it is more desirable that the rolling element 32 has an electrical insulation property that does not substantially pass a current when the sliding door 2 is electrodeposited. When ceramics made of Si ₃ N ₄ is applied, a rolling element 32 having a specific resistance of 10 ¹⁴ Ω · cm or more can be obtained.

  In the present embodiment, fluorine grease with excellent electrical insulation is used as the grease 3g. More specifically, a grease mainly composed of perfluoropolyether or polytetrafluoroethylene can be used as the fluorine-based grease.

(Operation and effect of the embodiment)
According to the present embodiment, since the electrical short circuit between the first stay 252 and the sliding contact portions 33b and 33c of the outer ring 33 is suppressed, the sliding of the outer ring 33 is performed during the electrodeposition coating of the slide door 2. It is possible to prevent the contact portions 33b and 33c from being charged and attracting the electrodeposition paint. Thereby, compared with the case where the sliding contact parts 33b and 33c are short-circuited with the 1st stay 252, a coating becomes difficult to deposit around the sliding contact parts 33b and 33c.

  Further, since the seal members 35 and 36 are in sliding contact with the outer ring 33, the lip portion of the seal members 35 and 36 can be moved away from the first stay 252 as compared with the case where the seal member is in sliding contact with the inner ring 31. This configuration also makes it difficult for paint to deposit around the sliding contact portions 33a and 33b.

  Further, if the rolling element 32 is made of an insulating ceramic, the outer ring 33 can be insulated from the inner ring 31, and the relative rotation between the outer ring 33 and the seal members 35 and 36 can be more reliably prevented by the paint. Can be suppressed.

  Furthermore, if a fluorine-based grease having excellent electrical insulation is applied as the grease 3g, the outer ring 33 and the inner ring 31 can be more reliably insulated.

  Therefore, it is not necessary to mask the rolling bearing 3 at the time of electrodeposition coating or to replace the rolling bearing 3 after the electrodeposition coating, and the number of assembling steps of the vehicle 1 can be reduced.

[Other embodiments]
As mentioned above, although the rolling bearing of this invention was demonstrated based on the said embodiment, this invention is not limited to the said embodiment, It is possible to implement in a various aspect in the range which does not deviate from the summary. For example, the following modifications are possible.

(1) In the above-described embodiment, the insulating ceramic is used as an example of the material of the rolling element 32. However, the invention is not limited to this. For example, the rolling element 32 made of a hard resin may be used. Further, for example, a rolling element 32 in which an insulating film is formed around a core made of metal may be used.

(2) In the above embodiment, the case where the rolling element 32 is formed of a material having high electric resistance has been described. However, the same action and effect can be obtained by increasing the electric resistance of the inner ring 31 or the outer ring 33. be able to. As such an inner ring | wheel 31 or the outer ring | wheel 33, an insulating ceramic and hard resin can be used, for example.

(3) In the above embodiment, the case where fluorine grease is used as the grease 3g has been described. However, the present invention is not limited to this, and various types of grease called insulating grease can be used.

(4) Moreover, although the case where this invention was applied to the rolling bearing for vehicle slide doors was demonstrated in the said embodiment, an inner ring | wheel is fixed to the electroconductive member electrodeposited without being restricted to this. If it is a thing, it is also possible to apply this invention to the rolling bearing provided in application objects other than the sliding door for vehicles.

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Slide door, 3 ... Rolling bearing, 3g ... Grease, 4 ... Rolling bearing, 10 ... Vehicle body, 10a ... Door opening part, 11 ... Center guide rail, 12 ... Upper guide rail, 13 ... Lower guide rail , 20 ... Slide door main body, 21 ... Center roller unit, 22 ... Upper roller unit, 23 ... Lower roller unit, 24 ... Main arm, 25 ... First support member, 26 ... Second support member, 31 ... Inner ring, 31a ... Inner raceway surface, 31b, 31c ... fixed portion, 31d ... seal groove inlet portion, 32 ... rolling element, 33 ... outer ring, 33a ... outer raceway surface, 33b, 33c ... sliding contact portion, 33d ... outer peripheral surface, 34 ... cage 35, 36 ... sealing member, 35a ... fixed portion, 110 ... cover member, 111 ... first rail, 111a ... upper surface, 112 ... second rail, 113 ... 202, second support member, 221, 231 ... roller member, 251 ... first sub arm, 252 ... first stay, 252a ... annular recess, 261 ... second sub arm, 262 ... second stay, 33 ... covering member, 351: Metal core, 352 ... Elastic body, 352a ... Lip part

Claims (5)

An inner ring fixed to a conductive member to be electrodeposited and having an inner raceway surface;
An outer ring having an outer raceway surface facing the inner raceway surface;
A plurality of rolling elements disposed between the inner raceway surface and the outer raceway surface;
A seal member that suppresses leakage of grease sealed between the inner ring and the outer ring,
The end portion on the inner peripheral side is fixed to the inner ring so that the end portion on the outer peripheral side is in sliding contact with the outer ring,
A rolling bearing in which an electrical short circuit with the conductive member is suppressed at a sliding contact portion that is in sliding contact with the seal member of the outer ring.   The rolling bearing according to claim 1, wherein the plurality of rolling elements are made of a material having an electric resistance higher than that of the material of the inner ring.   The rolling bearing according to claim 2, wherein the plurality of rolling elements are insulating ceramics.   The rolling bearing according to any one of claims 1 to 3, wherein the grease is an insulating fluorine-based grease. The conductive member is a support member provided on a slide door main body that is opened and closed with respect to a door opening of the vehicle body by moving in a vehicle front-rear direction along a rail formed on a side surface of the vehicle body. ,
The rolling bearing according to any one of claims 1 to 4, wherein the outer ring rolls along the rail as the slide door body moves.

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