JP2012149776A - Rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device which dispenses with gauging processing to a drive shaft and a knuckle while improving the function of preventing infiltration of muddy water by installing a seal member to be arranged between the drive shaft and the knuckle on the bearing part side.SOLUTION: The rolling bering 2 includes: an outer ring 2a connected to an installation port 3a of the knuckle 3; an inner ring 2b connected to a wheel via a hub 5; a rolling element 2c interposed between the outer ring 2a and the inner ring 2b; and a sealing device 4 for sealing the mutual inner and outer rings from the outside. The rolling bearing 2 further includes a seal part 8 for regulating foreign matter infiltrating into the rolling bearing 2 through a clearance X1 existing between the drive shaft 6 and the knuckle 3 provided rotatably with the inner ring 2b. The seal part 8 includes a cover 8a formed in an annular ring shape. The cover part 8a includes a cylindrical portion 8b press-fitted to the outer ring 2a and an annular vertical wall portion 8c extended inward in the radial direction from an end of the cylindrical portion 8b. The inner diameter end of the annular vertical wall portion 8c is provided with an outer lip portion 8d for exerting a seal function in cooperation with an outer peripheral surface 6a of the drive shaft 6.

Description

  The present invention relates to a rolling bearing device used for a vehicle wheel support structure.

  A wheel in a vehicle having a structure in which a drive shaft that rotates integrally with a wheel is connected to a hub for mounting the wheel, and the hub is rotatably supported by a knuckle through a bearing. A support device is known (see Patent Document 1).

  Further, in the bearing used in such a wheel support device, muddy water enters between the inner and outer rings. For this reason, a bearing device is known in which a sealing device is provided between the inner and outer rings to prevent intrusion of muddy water (see Patent Document 2).

JP 2000-71710 A JP 2006-208038 A

  However, in this wheel support device, as shown in FIG. 10, the bearing C is formed from the gap D existing between the outer peripheral surface A1 of the drive shaft A and the mounting port B1 for inserting and fitting the bearing C in the knuckle B. The muddy water enters the sealing device C1 side. If this muddy water is traveling, it will vigorously enter the sealing device C1 side. Therefore, the sealing device C1 alone may not prevent intrusion. In order to prevent such muddy water from entering, It is known that a deflector E having a labyrinth seal function is provided between the outer peripheral surface A1 and the attachment port B1 of the knuckle B. In this structure, in order to press-fit the deflector E into the outer peripheral surface A1 of the drive shaft A, the outer peripheral surface A1 must be cut, while the inner peripheral surface B2 of the knuckle B attachment port B1. Needs to form a gap F between the inner peripheral surface B2 and the outer peripheral side E1 of the deflector E so as to have a labyrinth seal function, and the inner peripheral surface B2 also needs to be cut. In addition, this processing has a problem that it becomes an in-process processing due to a variation in tolerance of each part.

  The present invention attaches a seal member disposed in the gap between the drive shaft and the knuckle to the bearing portion side, eliminates the need for the current machining to the drive shaft and knuckle, and intrudes muddy water into the bearing portion side. It is providing the rolling bearing apparatus which improves a prevention function.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, a rolling bearing device according to the present invention includes an outer ring connected to a knuckle attachment port on a vehicle inner side, an inner ring connected to a vehicle outer side wheel via a hub, and the outer ring. In a rolling bearing comprising a rolling element interposed between the inner ring and a sealing device for sealing between the inner and outer rings from the outside,
A seal portion is provided for restricting foreign matter entering the rolling bearing side from a gap existing between a drive shaft provided rotatably with the inner ring and the knuckle;
The seal portion is a composite structure of an annular seal body made of an elastic body and an annular cover provided integrally with the seal body,
The cover includes a first tube portion fitted on the inner ring, a first wall portion bent from an end portion thereof and extending in an outer diameter direction, and a vehicle inner portion extending from the end portion of the first wall portion. And a second wall portion extending from the end of the second cylindrical portion toward the drive shaft.

  In the present invention, a skirt portion is further provided so as to form a gap with the outer peripheral surface of the drive shaft from the second wall portion toward the vehicle inner side.

  In the present invention, the gap is set so as to increase as it moves from the vehicle outer side to the vehicle inner side.

  According to the above configuration, the cover attached to the rolling bearing is provided with the skirt portion that exerts the sealing function, so that it is not necessary to perform the in-situ processing on the drive shaft and the knuckle. In addition, muddy water having a dynamic pressure entering from between the drive shaft and the knuckle is also sealed by the skirt portion, so that the load on the sealing device of the rolling bearing is reduced. And since it has a double sealing function, the sealing function itself can be improved.

Sectional drawing which shows the wheel support structure equipped with the rolling bearing apparatus which concerns on this invention. The fragmentary sectional view which shows the sealing device of a rolling bearing apparatus. The fragmentary sectional view which shows the cover of a rolling bearing apparatus. The fragmentary sectional view which shows other embodiment of a cover. The fragmentary sectional view which shows other embodiment of a cover. The fragmentary sectional view which shows other embodiment of a cover. The fragmentary sectional view which shows other embodiment of a cover. The fragmentary sectional view which shows other embodiment of the sealing device of a rolling bearing apparatus. The fragmentary sectional view which shows other embodiment of a sealing device. Sectional drawing which shows the wheel support structure by background art. An axial direction sectional view of a rolling bearing device with a sensor which equipped a seal part. The perspective view of a rolling bearing device with a sensor. The perspective view of a fixing | fixed part. The perspective view of an ABS sensor. The perspective view of a cover part. The perspective view of other embodiment of the rolling bearing apparatus with a sensor. The axial direction sectional view of other embodiments of a rolling bearing device with a sensor. The perspective view of other embodiment of an ABS sensor. The perspective view of other embodiment of the rolling bearing apparatus with a sensor.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a cross-sectional view showing an example of a rolling bearing device according to the present invention. In FIG. 1, a rolling bearing device 1 includes a rolling bearing 2 composed of an outer ring 2a, an inner ring 2b, and rolling elements 2c as balls arranged in a plurality of examples interposed between the inner ring 2b and the outer ring 2a. I have.

  The rolling bearing 2 is connected to an attachment port 3a of a knuckle 3 as a vehicle fixing member on the vehicle inner side. This connection is made by inserting and fitting one end of the outer ring 2a of the rolling bearing 2 on the inner side of the vehicle into the mounting port 3a, and fastening the flange portion 2d formed on the outer side of the outer ring 2a with bolts and nuts. It is fixed to the peripheral surface (vehicle outer side) of the attachment port 3a of the knuckle 3 via the member 2e.

  Further, the rolling bearing 2 is provided with a sealing device 4 for sealing between the inner ring 2b and the outer ring 2a from the outside. As shown in FIG. 2, the sealing device 4 includes an annular outer case fitted into the outer ring 2a in a state where the annular inner case 4a fitted to the inner ring 2b and the annular seal member 4b are integrated. It is comprised by case 4c.

  The inner case 4a is a sheet metal having an L-shaped cross section including a first cylindrical portion 4a1 fitted on the inner ring 2b and a first wall portion 4a2 bent from the end portion and extending in the outer diameter direction. It is made of material.

  The outer case 4c is a sheet metal having a substantially L-shaped cross section including a second cylindrical portion 4c1 fitted into the outer ring 2a and a second wall portion 4c2 bent from the end portion and extending in the inner diameter direction. Made of material.

  The seal member 4b integrated with the outer case 4c is made of an elastic body such as rubber to be vulcanized and bonded. The integrated seal member 4b has an axial lip 4b1 whose tip is in sliding contact with the first wall 4a2 of the inner case 4a, and a radial lip 4b2 whose tip is in sliding contact with the first cylindrical portion 4a1 of the inner case 4a. The inner case 4a and the seal member 4b cooperate to exhibit a contact type sealing function.

  Returning to FIG. 1, the inner ring 2 b of the rolling bearing 2 is connected to the hub 5. The hub 5 has a hub bolt 5a for mounting a wheel (not shown) on the vehicle outer side. The hub 5 has a press-fit shaft portion 5b that is press-fitted into the inner ring 2b of the rolling bearing 2 on the vehicle inner side. The press-fit shaft portion 5b is press-fitted into the inner ring 2b and the hub 5 rotates together with the inner ring 2b. It is provided as possible.

  The hub 5 is spline-coupled to the drive shaft 6, and one end side of the drive shaft 6 is passed through an insertion hole 5 c formed in the press-fit shaft portion 5 b of the hub 5, and a nut 7 is screwed to this end portion. Has been.

  Further, the rolling bearing 2 includes muddy water, dust, and the like that enter the sealing device 4 side of the rolling bearing 2 from an annular gap X that exists between the drive shaft 6 and the knuckle 3 that are rotatably provided with the inner ring 2b. A seal portion 8 for restricting foreign matters is provided.

  The seal portion 8 has a composite structure of an annular seal body 8g that contacts the drive shaft 6 and an annular cover 8a. The cover 8a includes a cylindrical portion 8b that is press-fitted into the outer peripheral surface 2a1 of the outer ring 2a, an annular standing wall portion 8c that is bent from the end of the cylindrical portion 8b and extends in the inner diameter direction, and is continuously provided. Consists of. An outer lip portion 8d as a part of a seal body 8g made of an elastic body that cooperates with the outer peripheral surface 6a of the drive shaft 6 to exert a sealing function of a contact system at the inner diameter end of the annular standing wall portion 8c of the cover 8a. Is provided.

  A contact surface 8c1 that is abutted against the end surface 2a3 of the outer ring 2a is provided on the base side that is continuous with the cylindrical portion 8b in the annular standing wall portion 8c. Further, a continuous cylinder portion 8c2 bent from the contact surface 8c1 and continuing to the inner side of the vehicle, and a continuous wall portion 8c3 bent from the continuous cylinder portion 8c2 and extending in the inner diameter direction are continuously provided. Made of material. The outer lip portion 8d provided at the inner diameter end of the annular standing wall portion 8c formed in this way is a part of the seal body 8g integrated with the cover 8a by vulcanizing and bonding an elastic body such as rubber. Projecting in the inner diameter direction.

  The cylindrical portion 8b of the cover 8a is press-fitted to the outer peripheral surface 2a1 of the outer ring 2a of the rolling bearing 2, and the contact surface 8c1 is abutted against the end surface 2a3, thereby positioning the cover 8a. In addition, since a gap X1 is formed between the continuous wall portion 8c3 of the cover 8a and the end of the rolling bearing 2, the accumulation is suppressed even if foreign matter is mixed in, and reliability for long-term use is ensured. Will improve. Further, the cover 8a is formed with a drain hole 8f for discharging foreign matter that has entered the gap X1 at a position located below when the rolling bearing device 1 is assembled to the vehicle.

  Further, a part of the outer peripheral surface 2a1 of the outer ring 2a into which the cylindrical portion 8b of the cover 8a is press-fitted is formed with a diameter smaller than the outer diameter of the outer peripheral surface 2a1, and the outer diameter surface 8b1 of the cylindrical portion 8b is formed on the outer ring. A reduced diameter step surface 2a11 is formed so as not to protrude from the outer peripheral surface 2a1 of 2a. Even when the cylindrical portion 8b is press-fitted and fitted into the reduced diameter step surface 2a11, the reference surface (outer peripheral surface 2a1) when the rolling bearing 2 is mounted to the mounting port 3a of the knuckle 3 is maintained.

  Further, as shown in FIG. 3, a spring portion 8b2 that presses and holds the outer peripheral surface 2a1 of the outer ring 2a is provided on the cylindrical portion 8b that is press-fitted to the reduced diameter step surface 2a11 (outer peripheral surface 2a1) of the outer ring 2a. A plurality are provided at predetermined intervals with respect to the direction. The spring portion 8b2 is formed so as not to protrude from the outer peripheral surface 2a1 of the outer ring 2a. The spring 8b2 prevents the cover 8a from coming off.

  Further, as shown in FIG. 4, the cylindrical portion 8b of the cover 8a can be press-fitted directly into the outer peripheral surface 2a1 without providing the reduced diameter step surface 2a11 on the outer peripheral surface 2a1 of the outer ring 2a. About the other structural member by this example, the member similar to the structural member in the above-mentioned other embodiment attaches | subjects the same code | symbol in a figure, and the detailed description is abbreviate | omitted.

  Further, as shown in FIG. 5, the cylindrical portion 8b of the cover 8a can be formed so as to be press-fitted to the inner peripheral surface 2a2 of the outer ring 2a. In addition, as another part for cooperating with the outer lip portion 8d and exhibiting a sealing function, if the inner ring 2b of the rolling bearing 2 protrudes from the outer ring 2a to the vehicle inner side, the inner peripheral surface of the inner ring 2b. The outer lip portion 8d is brought into contact with 2b2 as the location. About the other structural member by this example, the member similar to the structural member in the above-mentioned other embodiment attaches | subjects the same code | symbol in a figure, and the detailed description is abbreviate | omitted.

  6 is a cross-sectional view showing another embodiment of the cover 8a in the seal portion 8. In FIG. 6, the outer periphery of the drive shaft 6 is replaced with the outer lip portion 8d at the inner diameter end of the annular standing wall portion 8c. A skirt portion 8e that cooperates with the surface 6a to exert a non-contact type labyrinth seal function is extended to the vehicle inner side.

  The outer peripheral surface 6a of the drive shaft 6 has an arbitrary form. For example, when the drive shaft 6 is formed in a circular shape or a tapered shape, the skirt portion 8e has a cylindrical shape or a tapered tube along the outer peripheral surface 6a of the drive shaft 6. It is formed in a shape. Further, a predetermined gap X2 is formed between the skirt portion 8e and the outer peripheral surface 6a of the drive shaft 6 in order to exert a labyrinth seal function. In the case of the skirt portion 8e formed in a tapered shape, the gap X2 is set so as to increase as it moves from the vehicle outer side (right side in the figure) to the vehicle inner side (left side in the figure). About the other structural member by this example, the member similar to the structural member in the above-mentioned other embodiment attaches | subjects the same code | symbol in a figure, and the detailed description is abbreviate | omitted.

  Further, as shown in FIG. 7, the cylindrical portion 8b of the cover 8a having the skirt portion 8e can be formed so as to be press-fitted to the inner peripheral surface 2a2 of the outer ring 2a. About the other structural member by this example, the member similar to the structural member in the above-mentioned other embodiment attaches | subjects the same code | symbol in a figure, and the detailed description is abbreviate | omitted.

  As described above, the rolling bearing device 1 in which the cover 8a is externally attached to the rolling bearing 2 and has a double seal function includes the outer lip portion 8d having a contact type sealing function of the cover 8a, and a non-contact type labyrinth. By the skirt portion 8e having a sealing function, it is possible to prevent intrusion of muddy water flowing during traveling from the vehicle inner side clearance X at the attachment port 3a of the knuckle 3 to the rolling bearing 2 side.

  FIG. 8 is a cross-sectional view of an essential part showing another embodiment of the sealing device 4. In FIG. 8, in this example, the first wall 4a2 of the annular inner case 4a fitted on the inner ring 2b is shown. A cross-section composed of a third tube portion 4a3 bent from the end portion and extending toward the vehicle inner side and a third wall portion 4a4 bent from the end portion and extended to the drive shaft 6 side is substantially A character-shaped outer seal portion 4a5 is provided.

  The outer seal portion 4a5 is provided with an outer lip portion 4d made of an elastic body that cooperates with the outer peripheral surface 6a of the drive shaft 6 to exert a sealing function. The outer lip portion 4d is obtained by projecting a part of an elastic body such as rubber, which is integrated by vulcanization adhesion, to the drive shaft 6 side. About the other structural member by this example, the member similar to the structural member in the above-mentioned other embodiment attaches | subjects the same code | symbol in a figure, and the detailed description is abbreviate | omitted.

  Further, as shown in FIG. 9, instead of the outer lip portion 4 d of the sealing device 4, a skirt portion 4 e that cooperates with the outer peripheral surface 6 a of the drive shaft 6 to exert a non-contact type labyrinth seal function is provided in the vehicle. It extends to the inner side. The outer peripheral surface 6a of the drive shaft 6 has an arbitrary form. For example, when the drive shaft 6 is formed in a circular shape or a tapered shape, the skirt portion 4e has a cylindrical shape or a tapered cylindrical shape along the outer peripheral surface 6a of the drive shaft 6. It is formed.

  A predetermined gap X2 is formed between the skirt portion 4e and the outer peripheral surface 6a of the drive shaft 6 in order to exhibit a labyrinth seal function. In the case of the skirt portion 4e formed in a tapered shape, the gap X2 is set so as to increase as it moves from the vehicle outer side (right side in the figure) to the vehicle inner side (left side in the figure). About the other structural member by this example, the member similar to the structural member in the above-mentioned other embodiment attaches | subjects the same code | symbol in a figure, and the detailed description is abbreviate | omitted.

  As described above, the rolling bearing device 1 in which the sealing device 4 is provided with a double sealing function includes the outer lip portion 4d having a contact type sealing function and the skirt portion 4e having a non-contact type labyrinth sealing function. Intrusion of muddy water flowing during traveling can be prevented from the clearance X on the vehicle inner side in the mounting port 3a 3 to the rolling bearing 2 side.

  Next, an embodiment of the sensor-equipped rolling bearing device 11 to which the seal portion 8 in the rolling bearing according to the present invention is applicable will be described with reference to the examples shown in the drawings. About the other structural member by this example, the member similar to the structural member in the above-mentioned other embodiment attaches | subjects the same code | symbol in a figure, and the detailed description is abbreviate | omitted. Instead of the skirt portion 8e in the seal portion 8, the contact type outer lip portion 8d can be provided as described above.

  FIG. 11 is a sectional view in the axial direction of the rolling bearing device 11 with a sensor. In FIG. 11, a permanent magnet magnet rotor 9 (magnetic body) is fitted to the inner ring 2 b on the vehicle inner side of the sealing device 4 disposed on the vehicle inner side in the sensor-equipped rolling bearing device 11. The magnet rotor 9 has a structure in which N poles and S poles are alternately arranged along the circumferential direction. The magnetic flux density is changed by the rotation of the drive shaft 6 and the inner ring 2b, and the ABS sensor 20 detects this change. Measure the rotation speed.

  The ABS sensor 20 is attached to the cover 8 a in the seal portion 8. The cover 8 a is provided with a fixing portion 30 for fixing the ABS sensor 20.

  12 is a perspective view of the cover 8a to which the ABS sensor 20 is mounted, FIG. 13 is a view showing only the fixing portion 30, FIG. 14 is a view showing only the ABS sensor 20, and FIG. 15 is a view showing only the cover 8a. is there. In the fixing portion 30 shown in FIG. 13, a seat receiving surface 32 for mounting the ABS sensor 20 is formed, and a hole 33 is formed in the seat receiving surface 32. A nut 36 is welded to the radially inner side of the hole 33.

  Further, a pair of left and right stay portions 31a and 31b are continuously bent from both sides of the seat receiving surface 32. The main body portion 21 of the ABS sensor 20 is inserted between the stay portion 31a and the stay portion 31b. Moreover, the hole 31 for fixing the fixing | fixed part 30 to the cover 8a is formed in stay part 31a, 31b.

  The ABS sensor 20 shown in FIG. 14 is roughly divided into a main body 21 and a signal line 22. The main body 21 is provided with a detection unit that detects the magnetic flux density. A signal carrying the measured value is sent to the ECU mounted on the vehicle through the signal line 22.

  The surface of the main body 21 includes a tip 24, an upper surface 23, and side surfaces 25, and the main body 21 is formed in a columnar shape having a rectangular cross section. The main body 21 has another side surface, which is a surface on the back side of the side surface 25 in a portion not shown in FIG. Further, the main body portion 21 is formed with a protruding portion 29, and a through hole 27 is formed in this portion. As shown in FIG. 12, the ABS sensor 20 has a posture in which the tip 24 is directed radially inward and the protrusion 29 is directed inward in the axial direction (inward direction of the bearing). 30 is fixed.

  As shown in FIG. 14, a rail groove 26 is formed on the side surface 25 from the middle of the side surface 25 to the tip 24. The rail groove 26 is formed in the same shape on both side surfaces.

  The continuous wall portion 8c3 of the cover 8a is applied as a portion that covers the magnet rotor 9, and the continuous wall portion 8c3 covers the magnet rotor 9 along the circumferential direction with a gap therebetween. The inner diameter φb of the continuous wall portion 8c3 is set to be equal to or smaller than the inner diameter φa of the magnet rotor 9. Thereby, the continuous wall part 8c3 suppresses that the magnet rotor 9 is exposed outside.

  Thereby, it is possible to prevent foreign matters from being mixed into the magnet rotor 9 from the outside. In addition, since the gap X1 is formed between the magnet rotor 9 and the continuous wall portion 8c3, even if foreign matter is mixed in, the accumulation between the magnet rotor 9 and the continuous wall portion 8c3 is suppressed, Reliability in the long-term use of the magnet rotor 9 is improved.

  Further, a hole 41 is formed in the cover 8a as shown in FIG. The hole 41 is used for fixing the fixing portion 30 to the cover 8a. Further, a sensor hole 45 is formed in the cover 8a, and rail portions 35 that are fitted into the rail groove 26 of the main body 21 of the ABS sensor 20 are formed on both sides of the sensor hole 45. Yes. The ABS sensor 20 is fixed at the position of the sensor hole 45, and the measurement part of the ABS sensor 20 directly faces the magnet rotor 9, so that the magnetic field can be measured.

  The ABS sensor 20 is integrated with the fixed portion 30 so that the rail groove portion 26 and the rail portion 35 are fitted. Further, as shown in FIG. 12, the ABS part 20 is fixed to the fixing part 30 by fastening the hole part 33 and the through hole 27 to which the nut 36 is welded on the back side with the bolt 55. Then, the through hole 31 formed in the fixing portion 30 and the hole portion 41 formed in the cover 8a are fastened by the bolt 51, whereby the fixing portion 30 is fixed to the cover 8a.

  In the above embodiment, taps may or may not be formed in the holes 33 and 31. The nut 36 may not be welded. Moreover, although bolt fastening was used with respect to the holes 33 and 31, as another method, for example, rivet caulking may be used. In the case of rivet caulking, the number of parts can be reduced as compared with the use of bolts and nuts.

  16 and 17 show examples in other embodiments. In the rolling bearing device with sensor 11 of this example, a drain hole 8f for drainage is formed in the lower portion of the cover 8a in the figure. The lower part illustrated in FIGS. 16 and 17 may correspond to the lower part in the actually installed state. By this drain hole 8f, muddy water that has entered the inside can be discharged to the outside.

  The inner diameter φe of the drain hole 8 f is set to be equal to or larger than the outer diameter φd of the magnet rotor 9. This suppresses the magnet rotor 9 from being exposed to the outside due to the presence of the drain hole 8f. Accordingly, since foreign matter is prevented from entering and adhering to the magnet rotor 9 through the drain hole 8f from the outside, the reliability of the magnet rotor 9 in long-term use is improved.

  Next, FIG. 18 and FIG. 19 show examples in other embodiments. In the sensor-equipped bearing device 11a of this example, the fixing portion 30 is not used, and the ABS sensor 20a is directly fixed to the cover 8a. As shown in FIG. 18, the ABS sensor 20a in this example includes a main body 21a and a signal line 22a. Projections 37a are formed on both side surfaces 25a of the main body 21a of the ABS sensor 20a, and holes 31a are formed in the protrusions 37a. FIG. 18 shows only one side surface 25a, but the other side surface 25a is a surface on the back side of the side surface 25a in FIG.

  As shown in FIG. 19, the hole 31 a and the hole 41 described above are fastened by the bolt 51 in a state where the measurement unit of the ABS sensor 20 a is disposed at the position of the sensor hole 45. The ABS sensor 20a is fixed to the cover 8a. Thus, the cost can be reduced by directly attaching the ABS sensor 20a to the cover 8a without the fixing portion 30. The fixing of the ABS sensor 20a and the cover 8a is not limited to bolt fastening, and a rivet may be used.

  In the rolling bearing device with a sensor according to this example, the fixing part 30 for fixing the ABS sensors 20 and 20a and the cover 8a are formed as separate bodies and then joined to each other. The fixing part 30 is joined by bolt fastening or rivet fastening. 20 and 20a are fixed, and the cover 8a covers the entire circumference of the magnet rotor 9 without exposing it in the axial direction. Therefore, both fixing the ABS sensors 20 and 20a and not exposing the magnet rotor 9 to the outside are possible. Can be achieved.

  Further, since the ABS sensors 20 and 20a are fixed to the fixing portion 30 by bolt fastening or rivet caulking using the holes 31a and 41, they can be firmly fixed by a simple method. Therefore, it is possible to avoid an increase in measurement value error due to the weak fixability and the displacement of the sensor position and orientation.

  Moreover, since the protrusion part 37a is formed in the ABS sensors 20 and 20a and the hole part 31a formed in the protrusion part 37a becomes a radial direction and the protrusion direction of the protrusion part 37a is fixed as an axial direction, the ABS sensors 20 and 20a are fixed. Since the mechanism for fixing the cover to the cover 8a protrudes in the radial direction and does not take up space, it is suitable for mounting on the bearing device.

  Since the rail portion 35 and the rail groove portion 26 formed in the radial direction are fitted to position the sensor, movement of the sensor in the axial direction is restricted. Therefore, coupled with the restriction of the radial and circumferential movements by bolt fastening or rivet tightening, the position and posture of the sensor are further stabilized. Therefore, it is possible to suppress the occurrence of an error in the measurement value due to the position and orientation of the sensor being shifted, and the sensor-equipped bearing device 11 having high reliability with respect to the measurement value of the sensor can be configured.

DESCRIPTION OF SYMBOLS 2 Rolling bearing 2a Outer ring 2a1 Outer surface 2b Inner ring 2c Rolling body 3 Knuckle 3a Mounting port 4 Sealing device 4a Inner case 4b Seal member 4c Outer case 4d Outer lip part 5 Hub 6 Drive shaft 6a Outer surface 8 Seal part 8a Cylinder part 8b 8b2 Spring portion 8c Annular standing wall portion 8d Outer lip portion 8e Skirt portion X1 Clearance

Claims (3)

An outer ring connected to an attachment port of a knuckle on the inner side of the vehicle, an inner ring connected to a wheel on the outer side of the vehicle via a hub, a rolling element interposed between the outer ring and the inner ring, and the inner and outer rings In a rolling bearing provided with a sealing device for sealing between the outside,
A seal portion is provided for restricting foreign matter entering the rolling bearing side from a gap existing between a drive shaft provided rotatably with the inner ring and the knuckle;
The seal portion is a composite structure of an annular seal body made of an elastic body and an annular cover provided integrally with the seal body,
The cover includes a first tube portion fitted on the inner ring, a first wall portion bent from an end portion thereof and extending in an outer diameter direction, and a vehicle inner portion extending from the end portion of the first wall portion. A rolling bearing device comprising: a second cylindrical portion extending to the side, and a second wall portion extending from the end portion toward the drive shaft.   The rolling bearing according to claim 1, further comprising a skirt portion so as to form a gap with the outer peripheral surface of the drive shaft from the second wall portion toward the vehicle inner side. apparatus.   The rolling bearing device according to claim 2, wherein the gap is set to increase as the vehicle moves from the vehicle outer side to the vehicle inner side.

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