Bearing cap for wheel bearing device with rotation speed detection device, and wheel bearing device with rotation speed detection device

Abstract

The object of the present invention is to provide a bearing cap for a wheel bearing device with a rotation speed detection device, which can efficiently discharge foreign matter that has intruded into the interior of a sensor support portion to the outside of the sensor support portion and ensure the rigidity of the sensor support portion, and a wheel bearing device with a rotation speed detection device. The bearing cap (11) is formed with a sensor support portion (21) on the bottom portion (15c) of the cap body (15), and an insertion hole (21a) for a rotation speed sensor (19) is formed in the sensor support portion (21), wherein a recess (15d) for accommodating the front end of the rotation speed sensor (19) is formed in the portion of the bottom portion (15c) where the sensor support portion (21) is formed, and the sensor support portion (21) includes a first wall portion (21b ) and a second wall portion (21c), the first wall portion (21b) and the second wall portion (21c) are arranged opposite to each other with an imaginary line (L) passing through the axis (G1) of the bottom portion (15c) and the axis (G2) of the insertion hole (21a) sandwiched therebetween, and are formed along the peripheral edge of the recess (15d), and convex portions (21d) protruding from the bottom portion (15c) are continuously provided on the outer peripheral surfaces of the first wall portion (21b) and the second wall portion (21c), respectively.

Description

Technical Field

[0001] The present invention relates to a bearing cap for a wheel bearing device with a rotation speed detection device, and a wheel bearing device with a rotation speed detection device having the bearing cap. Background Art

[0002] Conventionally, as a bearing device for supporting a wheel of an automobile or the like, a wheel bearing device is known that rotatably supports a hub ring to which the wheel is mounted via two rows of rolling bearings.

[0003] As for the wheel bearing device, there is known a wheel bearing device to which a rotation speed detection device for detecting the rotation speed of a wheel is added in order to control an anti-lock brake system (ABS).

[0004] The rotation speed detection device includes: a magnetic encoder integrated with a sealing device arranged between the inner member and the outer member; and a rotation speed sensor arranged opposite to the magnetic encoder for detecting a change in the magnetic pole of the magnetic encoder caused by the rotation of the wheel.

[0005] The rotation speed sensor is mounted on a sensor support portion formed on a bottomed cylindrical bearing cap made of resin that closes an opening on the inner side of the outer member, and is arranged to face the encoder.

[0006] Furthermore, the sensor support portion may be formed in a shape with a closed bottom in order to suppress the intrusion of foreign matter into the interior of the bearing device.

[0007] In such a conventional wheel bearing device with a speed detection device, the following features are provided: when the sensor support portion of the bearing cover is equipped with the speed sensor, the interior of the sensor support portion (more specifically, the space portion surrounded by the inner circumferential surface of the sensor support portion and the front end portion of the assembled speed sensor) is isolated from the outside, and there are few intrusion paths for foreign matter such as moisture and mud to penetrate into the interior of the sensor support portion, thereby providing excellent sealing performance for the speed detection device as a whole.

[0008] On the other hand, once foreign matter has penetrated into the sensor support, it is difficult to be discharged to the outside of the sensor support. Foreign matter such as water and mud accumulated at the bottom may freeze and may become a major factor causing damage to the front end or the bottom of the speed sensor.

[0009] Therefore, Patent Document 1 discloses a technique for solving such a problem.

[0010] That is, in patent document 1, a bearing cover is disclosed, which is a resin bearing cover having a sensor support portion for mounting a rotational speed sensor, and an insertion hole with a bottom shape for inserting a rotation sensor is formed in the sensor support portion along an axial extension, and the bearing cover is constructed so that the four corners of the insertion hole extend radially when viewed in cross section.

[0011] Prior Art Literature

[0012] Patent Literature

[0013] Patent Document 1: International Publication No. 2014 / 044261 Summary of the invention

[0014] Problems to be solved by the invention

[0015] However, in the bearing cover of Patent Document 1, the insertion hole of the sensor support portion is opened axially only at the four corners when viewed in cross section. Therefore, when foreign matter such as moisture, mud, etc. infiltrates into the interior of the sensor support portion, the moisture is discharged to the outside through the four corners of the insertion hole when viewed in cross section, but the foreign matter such as mud is not completely discharged to the outside and is easily accumulated inside the sensor support portion, making it difficult to efficiently discharge the foreign matter that has infiltrated the interior of the sensor support portion to the outside.

[0016] The object of the present invention is to provide a bearing cap for a wheel bearing device with a rotation speed detection device and a wheel bearing device with a rotation speed detection device, which can efficiently discharge foreign matter that has invaded the interior of a sensor support portion to the outside of the sensor support portion and ensure the rigidity of the sensor support portion.

[0017] Solutions to Solve Problems

[0018] That is, the bearing cap for a wheel bearing device with a rotation speed detection device involved in the invention comprises: a bottomed cylindrical cap body obtained by injection molding a synthetic resin; and a core metal molded integrally with the opening of the cap body, a sensor support portion protruding axially outward is integrally formed on the axially outer side surface of the bottom portion of the cap body, and an insertion hole for assembling a rotation speed sensor is formed in the sensor support portion along the axial direction. The bearing cap for a wheel bearing device with a rotation speed detection device is characterized in that the portion on the outer side surface of the bottom portion where the sensor support portion is formed is closely connected to the insertion hole. The insertion hole is continuously formed with a recess for accommodating the front end portion of the speed sensor, and the sensor support portion includes a first wall portion and a second wall portion, which are arranged opposite to each other with an imaginary line passing through the axis of the bottom portion and the axis of the insertion hole in the middle, and are formed along the peripheral portion of the recess, and a convex portion is continuously provided on the outer peripheral surface of the first wall portion and the outer peripheral surface of the second wall portion, respectively, and the convex portion protrudes radially outward from the sensor support portion and protrudes axially from the outer side surface of the bottom portion, and the protruding dimension of the convex portion along the axial direction is shorter than that of the sensor support portion.

[0019] In addition, the wheel bearing device with a speed detection device involved in the invention comprises: an outer member, which has two rows of outer raceway surfaces on the inner circumference; an inner member, which includes a hub ring and at least one inner ring, and the inner member has two rows of inner raceway surfaces on the outer circumference opposite to the two rows of outer raceway surfaces, the hub ring is formed with a small diameter step portion extending along the axial direction on the outer circumference, and the at least one inner ring is pressed into the small diameter step portion; two rows of rolling elements, which are respectively accommodated between the raceway surface of the outer member and the raceway surface of the inner member in a rolling manner; a pulse ring, which is embedded in the inner ring, and the magnetic properties of the pulse ring change alternately and at equal intervals along the circumferential direction; and a speed sensor, which is arranged opposite to the pulse ring with an air gap. The wheel bearing device with a speed detection device is characterized in that it also has a bearing cover according to any one of the first to third inventions, and the bearing cover is assembled at the end of the inner side of the outer member.

[0020] Effects of the Invention

[0021] The present invention has the following effects.

[0022] That is, in the bearing cover for the wheel bearing device with the speed detection device involved in the invention, and the wheel bearing device with the speed detection device having the bearing cover, the sensor support portion includes a first wall portion and a second wall portion, which are arranged opposite to each other with an imaginary line passing through the axis of the bottom portion of the cover body and the axis of the insertion hole for assembling the speed sensor in the middle, and are formed along the peripheral portion of the recessed portion for accommodating the front end portion of the speed sensor.

[0023] Therefore, an opening portion extending along the axial direction is formed in the sensor support portion and is formed by the gap between the first wall portion and the second wall portion. When foreign matter such as moisture, mud, etc. intrudes into the interior of the sensor support portion, the foreign matter can be efficiently discharged to the outside of the sensor support portion through the opening portion.

[0024] In addition, convex portions are continuously provided on the outer peripheral surfaces of the first wall portion and the second wall portion constituting the sensor support portion, respectively. The convex portions protrude radially outward from the sensor support portion and protrude axially from the outer side surface of the bottom portion of the cover body. The convex portions have a shorter protruding dimension along the axial direction than the sensor support portion, and thus the rigidity of the first wall portion and the second wall portion are respectively ensured by the convex portions.

[0025] That is, by providing the convex portion, the rigidity of the sensor support portion including the first wall portion and the second wall portion can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional side view showing the overall structure of a wheel bearing device with a rotation speed detection device including a bearing cap according to the present invention.

[0027] FIG2 is a diagram showing the structure of a bearing cap according to the present invention, Figure 2A is its main view, Figure 2B It is along Figure 2A A sectional side view as viewed in the direction of arrow II. DETAILED DESCRIPTION

[0028] Next, use Figure 1 2 , an embodiment in which a bearing cap 11 and a wheel bearing device 1 with a rotation speed detection device according to the present invention are embodied will be described.

[0029] It should be noted that, in this specification, for the sake of convenience, Figure 1 The outer side and the inner side are expressed as defined by the directions of arrows shown in FIG. 2 .

[0030] Here, the “outer side” refers to the direction of the wheel side rotatably supported by the wheel bearing device 1 relative to the wheel bearing device 1 with a rotation speed detection device installed on the body of a motor vehicle, etc. In addition, the “inner side” refers to the side opposite to the outer side relative to the wheel bearing device 1 with a rotation speed detection device installed on the body of a motor vehicle, etc., that is, the direction of the inner side of the body.

[0031] In addition, in this specification, the rotation axis G (refer to Figure 1 ) is defined as the "axial direction", the direction perpendicular to the rotation axis G of the wheel bearing device 1 is defined as the "radial direction", and the direction along the arc centered on the rotation axis G of the wheel bearing device 1 is defined as the "circumferential direction".

[0032] [Overall Structure of Wheel Bearing Device 1 with Rotation Speed ​​Detection Device]

[0033] First, use Figure 1 The overall structure of the wheel bearing device 1 with a rotation speed detection device in this embodiment will be described.

[0034] A wheel bearing device 1 with a rotation speed detection device (hereinafter simply recorded as "wheel bearing device 1") is a third-generation wheel bearing device for a driven wheel, which comprises: an inner member 4 having a hub ring 2 and an inner ring 3; and an outer member 6, which is inserted into the inner member 4 via two rows of rolling elements (balls) 5, 5.

[0035] The wheel hub 2 integrally has a wheel mounting flange 7 for mounting a wheel (not shown) at the outer end, and bolt holes 7a are formed at equidistant positions on the circumference of the wheel mounting flange 7. The bolt holes 7a are used to fix hub bolts (not shown) that fasten the wheel rim and the like to the wheel hub 2.

[0036] The hub wheel 2 has an inner raceway surface 2a on one side (outer side) and a cylindrical small-diameter step portion 2b extending inward from the inner raceway surface 2a formed on its outer periphery.

[0037] In addition, an inner ring 3 is pressed into the small diameter step portion 2b of the hub ring 2, and the inner ring 3 has an inner raceway surface 3ac on the other side (inner side) on the outer periphery. In addition, a rivet portion 2c that plastically deforms radially outward is formed at the end of the small diameter step portion 2b, and the inner ring 3 is fixed axially relative to the hub ring 2 by the rivet portion 2c in a state where a specified bearing preload is given to the inner ring 3.

[0038] The outer member 6 integrally has a vehicle body mounting flange 6a on the outer periphery for mounting to a knuckle (not shown), and has two rows of outer track surfaces 6b, 6b on the inner periphery facing the two rows of inner track surfaces 2a, 3a.

[0039] Two rows of rolling elements 5, 5 are respectively accommodated between the outer raceway surfaces 6b, 6b of the outer member 6 and the two rows of inner raceway surfaces 2a, 3a facing the outer raceway surfaces 6b, 6b. The two rows of rolling elements 5, 5 are rollably held by retainers 8, 8.

[0040] Moreover, a bottomed cylindrical bearing cover 11 formed of synthetic resin is assembled at the open end portion on the inner side of the outer member 6, and the opening portion on the inner side of the outer member 6 is closed by the bearing cover 11 to prevent rainwater or dust from invading the interior of the wheel bearing device 1 from the outside.

[0041] An impulse ring 12 is embedded outside the outer diameter of the inner ring 3 .

[0042] The pulse ring 12 includes a support ring 13 formed in a circular ring shape and a magnetic encoder 14 bonded to a side surface of the support ring 13 by vulcanization.

[0043] The magnetic encoder 14 is a rotary encoder for detecting the rotation speed of a wheel in which magnetic powder such as ferrite is mixed into an elastic body such as rubber, magnetic poles N and S are magnetized alternately and evenly in the circumferential direction to change magnetic properties.

[0044] The support ring 13 is formed into a substantially L-shaped cross section by, for example, stamping a ferromagnetic steel plate, and has a cylindrical fitting portion 13a fitted in the inner ring 3 and a vertical plate portion 13b extending radially inward from the inner end of the fitting portion 13a.

[0045] Furthermore, a magnetic encoder 14 is joined to the inner side surface of the upright plate portion 13 b.

[0046] As described above, the bearing cap 11 is fitted and fixed to the inner opening end portion of the outer member 6 , and closes the opening portion of the outer member 6 .

[0047] The bearing cap 11 includes a cap body 15 in a bottomed cylindrical shape, and a mounting portion 17 protruding inwardly is provided on a radially outer portion of the cap body 15 .

[0048] It should be noted that the structure of the bearing cap 11 will be described in detail later.

[0049] Furthermore, a sensor unit 18 is mounted on the mounting portion 17 of the bearing cap 11 , and thereby a rotation speed sensor 19 provided in the sensor unit 18 is arranged to face the magnetic encoder 14 of the pulser ring 12 with a predetermined air gap therebetween.

[0050] Here, the sensor unit 18 includes a speed sensor 19 composed of magnetic detection elements such as Hall elements and magnetoresistive elements (MR elements) whose characteristics change according to the direction of flow of magnetic flux, and an IC assembled with a waveform shaping circuit (not shown) for shaping the output waveform of the magnetic detection element, etc., forming an ABS (anti-lock braking system) of a motor vehicle that detects the rotation speed of the wheels and controls its rotation speed.

[0051] As described above, the wheel bearing device 1 in this embodiment is a wheel bearing device for a driven wheel, and an example of a wheel bearing device consisting of two rows of angular contact ball bearings using balls as the rolling elements 5 is given, but it is not limited to this, and it can also be a wheel bearing device consisting of two rows of tapered roller bearings using tapered rollers as the rolling elements 5.

[0052] In addition, a third-generation structure is illustrated, but it is not limited to this. As long as it is a wheel bearing device on the driven wheel side of the inner ring rotating type, it can also be a so-called second-generation structure in which a pair of inner rings are pressed into the small-diameter step portion of the hub ring. This structure is not shown in the figure.

[0053] [Structure of bearing cap 11]

[0054] Next, use Figure 1 The detailed structure of the bearing cap 11 in this embodiment will be described with reference to FIG. 2 .

[0055] like Figure 1 As shown, the bearing cap 11 is composed of a bottomed cylindrical cap body 15 obtained by injection molding a synthetic resin, and a core metal 16 molded integrally with an opening of the cap body 15 .

[0056] It should be noted that the synthetic resin cover body 15 may be directly mounted on the outer member 6 without providing the core metal 16, but providing the core metal 16 increases the strength and rigidity of the bearing cover 11, thereby improving the resistance to falling off and improving the airtightness of the fitting portion.

[0057] The cover body 15 is formed by injection molding of a non-magnetic special ether-based synthetic resin material such as polyphenylene sulfide (PPS), and further added with a fibrous reinforcing material such as glass fiber.

[0058] On the other hand, the core metal 16 is formed into an annular shape having an L-shaped cross section by press-forming a stainless steel plate or a cold-rolled steel plate, for example.

[0059] In addition, the cover body 15 includes: a cylindrical fitting portion 15a, which is fitted into the inner periphery of the inner side end portion of the outer member 6; a flange portion 15b, which is arranged radially outward of the fitting portion 15a and abuts against the inner side end surface of the outer member 6; and a planar bottom portion 15c, which is arranged radially inward of the flange portion 15b.

[0060] Furthermore, a mounting portion 17 is integrally formed on a radially outer portion of the outer surface of the bottom portion 15 c so as to protrude inward from the bottom portion 15 c .

[0061] The mounting portion 17 includes a sensor support portion 21 on which the sensor unit 18 is mounted, and a fixing portion 22 on which a holding member 20 described later is fixed by fixing bolts 23 .

[0062] The sensor support portion 21 is formed on an axially outer side surface of the bottom surface portion 15c of the cover body 15 (in this embodiment, an inner side surface of the bottom surface portion 15c) in the axial direction ( Figure 2B The bearing cap 11 is shown in the direction of the axis G1. The same applies hereinafter) to the outside (inside).

[0063] The fixing portion 22 is adjacent to the radial inner side of the sensor support portion 21 , is parallel to the sensor support portion 21 , and protrudes inward.

[0064] The sensor support portion 21 has an insertion hole 21 a extending in the axial direction, and the rotation speed sensor 19 of the sensor unit 18 is mounted in the insertion hole 21 a .

[0065] Here, the insertion hole 21 a is arranged at a position corresponding to the magnetic encoder 14 of the pulser ring 12 .

[0066] In addition, in the outer side surface of the bottom surface 15c, in the portion where the sensor support portion 21 is formed, a recess 15d is formed continuously with the insertion hole 21a, and the recess 15d is used to accommodate the front end of the speed sensor 19. With the help of the recess 15d, the insertion hole 21a is formed as a non-through hole with a bottom.

[0067] On the other hand, a fastening member that fastens and fixes the rotation speed sensor 19 is accommodated in the fixing portion 22 .

[0068] Specifically, the nut 24 that is threadedly engaged with the fixing bolt 23 is embedded in the fixing portion 22 by insert molding.

[0069] In the mounting portion 17 having such a structure, the rotation speed sensor 19 is inserted into the insertion hole 21 a of the sensor support portion 21 , and is thereby arranged to face the pulser ring 12 via the recessed portion 15 d of the bottom surface portion 15 c .

[0070] In addition, the speed sensor 19 inserted into the sensor support part 21 is inserted and engaged with one end of a retaining member 20 composed of a plate-like member and retained, and the other end of the retaining member 20 is fixed to the fixing part 22 by a fixing bolt 23, thereby the speed sensor 19 is firmly retained in the insertion hole 21a of the sensor support part 21 via the retaining member 20.

[0071] It should be noted that the wall thickness t (see Figure 2B ) is set to the range of 0.1 to 1.0 mm.

[0072] If the wall thickness t is less than 0.1 mm, the strength and rigidity are insufficient and the component may collide with other components and deform during assembly. If the wall thickness t exceeds 1.0 mm, the air gap becomes too large and the required magnetic flux density cannot be obtained, which is not preferred.

[0073] In addition, if Figure 2A As shown, in the present embodiment, the sensor support portion 21 is formed along the peripheral edge portion of the recessed portion 15d except for the upper end side and the lower end side (that is, the end portion on the road surface side).

[0074] Specifically, the sensor support portion 21 includes a first wall portion 21b and a second wall portion 21c in a cross-sectional C shape protruding axially, and the first wall portion 21b and the second wall portion 21c are arranged opposite to each other with an imaginary line L passing through the axis G1 of the bottom portion 15c of the cover body 15 and the axis G2 of the insertion hole 21a in the middle, and are formed along the peripheral portion of the recess 15d.

[0075] In addition, at the lower end portion of the outer peripheral surface in the first wall portion 21b and the lower end portion of the outer peripheral surface in the second wall portion 21c, there are respectively continuously provided protrusions 21d, 21d, which protrude radially outward from the sensor support portion 21 and protrude axially from the outer side surface (inner side surface) of the bottom portion 15c. Compared with the sensor support portion 21, the protrusions 21d, 21d are shorter in the axial direction.

[0076] With such a structure, openings Q and Q extending in the axial direction are formed on the upper end side and the lower end side of the sensor support portion 21 , respectively, and are formed by the gap between the first wall portion 21 b and the second wall portion 21 c .

[0077] As a result, even when foreign matter such as water, mud, etc. intrudes into the interior of the sensor support portion 21 , the foreign matter can be efficiently discharged to the outside of the sensor support portion 21 through the openings Q, Q.

[0078] Furthermore, convex portions 21d and 21d are continuously provided on the outer peripheral surfaces of the first wall portion 21b and the second wall portion 21c constituting the sensor support portion 21, respectively. Therefore, the rigidity of the first wall portion 21b and the second wall portion 21c are ensured by the convex portions 21d and 21d, respectively.

[0079] That is, by providing the convex portions 21d and 21d, it is possible to ensure the rigidity of the sensor support portion 21 including the first wall portion 21b and the second wall portion 21c.

[0080] It should be noted that if Figure 2B As shown in FIG. 1 , the inner diameter of the insertion hole 21a in the present embodiment is set to be equal to the inner diameter of the rotation speed sensor 19 (see FIG. 1 ) in the first region S1 from the midway portion in the axial direction to the base end portion of the sensor support portion 21. Figure 1 ) is of the same size corresponding to the outer diameter of the sensor support portion 21, and in the second region S2 from the midway portion in the axial direction to the protruding end portion (the end portion on the inner side) of the sensor support portion 21, it is set to be enlarged compared to the inner diameter of the insertion hole 21a in the first region S1.

[0081] Here, the cross-sectional area of ​​the insertion hole 21 a is not limited to that of the present embodiment, and may be set to be substantially equal to the cross-sectional area of ​​the rotation speed sensor 19 in the entire region in the axial direction.

[0082] However, by setting the cross-sectional area of ​​the insertion hole 21a of the sensor support portion 21 to be enlarged from the midway portion in the axial direction to the area spanning the protruding end portion of the sensor support portion 21 as in the present embodiment, the insertion operation of assembling the speed sensor 19 into the insertion hole 21a of the sensor support portion 21 can be easily performed.

[0083] In addition, a gap is created between the outer peripheral surface of the rotation speed sensor 19 mounted on the sensor support portion 21 and the enlarged diameter region of the inner peripheral surface of the insertion hole 21 a , so that foreign matter that has intruded into the sensor support portion 21 can be more efficiently discharged to the outside through the gap.

[0084] In addition, in the present embodiment, the axial protrusion dimension L1 of the protrusions 21d, 21d continuously provided on the outer peripheral surface of the first wall portion 21b and the outer peripheral surface of the second wall portion 21c is set to be larger than the axial dimension L2 of the first region S1 in which the cross-sectional area of ​​the insertion hole 21a is set to be equal to the outer diameter of the rotational speed sensor 19 as described above (L1>L2).

[0085] With such a structure, the rigidity of the sensor support part 21 can be more reliably ensured in the first region S1 of the inner peripheral surface of the sensor support part 21 which contacts the outer peripheral surface of the assembled rotation speed sensor 19 and supports the rotation speed sensor 19 .

[0086] The above describes the embodiments of the present invention, but the present invention is not limited to such embodiments but is merely exemplified. Of course, the present invention can be implemented in various forms without departing from the main purpose of the present invention. The scope of the present invention is shown by the description of the scope of the technical solution, and also includes equivalent meanings to those described in the scope of the technical solution, and all changes within the scope.

[0087] Industrial Applicability

[0088] The present invention can be used for a bearing cap for a wheel bearing device with a rotation speed detection device, and a wheel bearing device with a rotation speed detection device including the bearing cap.

[0089] Description of Reference Numerals

[0090] 1 Wheel bearing device with rotation speed detection device (wheel bearing device)

[0091] 2 Hub

[0092] 2a Inner track surface

[0093] 2b Small path step

[0094] 3 Inner ring

[0095] 3a Inner track surface

[0096] 4 Internal components

[0097] 5 Rolling elements

[0098] 6 External components

[0099] 6b Outer track surface

[0100] 11 Bearing cap

[0101] 12 Pulse Ring

[0102] 15 Cover body

[0103] 15c Bottom

[0104] 15d concavity

[0105] 16 Core Bone

[0106] 19 Speed ​​sensor

[0107] 21 Sensor support part

[0108] 21a Insertion hole

[0109] 21b First wall

[0110] 21c Second wall

[0111] 21d convex part

[0112] G1 Bottom axis

[0113] G2 Insert hole axis

[0114] L imaginary line

[0115] L1 protrusion size

[0116] S1 First Area

[0117] S2 Second area.

Claims

1. A bearing cap for a wheel bearing device with a rotation speed detection device, comprising: a bottomed cylindrical cap body obtained by injection molding a synthetic resin; and a core bone which is molded integrally with the opening of the cover body, A sensor support portion protruding outward in the axial direction is integrally formed on the axially outer side surface of the bottom surface portion of the cover body. The sensor support portion is provided with an insertion hole extending along the axial direction for assembling the rotation speed sensor. It is characterized in that A concave portion for accommodating a front end portion of the rotation speed sensor is formed continuously with the insertion hole in a portion of the outer side surface of the bottom surface portion where the sensor support portion is formed. The sensor support portion includes a first wall portion and a second wall portion, an opening portion extending in the axial direction is formed in a gap between the first wall portion and the second wall portion, the first wall portion and the second wall portion are arranged opposite to each other with an imaginary line passing through the axis of the bottom surface portion and the axis of the insertion hole in between, and the first wall portion and the second wall portion are formed along the peripheral edge of the recessed portion, A convex portion is continuously provided on the outer peripheral surface of the first wall portion and the outer peripheral surface of the second wall portion, respectively. The convex portion protrudes radially outward from the sensor support portion and protrudes axially from the outer side surface of the bottom portion. The convex portion has a shorter protruding dimension along the axial direction than the sensor support portion.

2. The bearing cap for the wheel bearing device with a rotation speed detection device according to claim 1, It is characterized in that In the sensor support portion, in a first region from the midway portion in the axial direction to the base end portion of the sensor support portion, the inner diameter of the insertion hole is set to a size corresponding to the outer diameter of the rotation speed sensor, and In the sensor support portion, in a second region from a midway portion in the axial direction to a protruding end portion of the sensor support portion, an inner diameter of the insertion hole is set to be larger than an inner diameter of the insertion hole in the first region.

3. The bearing cap for the wheel bearing device with a rotation speed detection device according to claim 2, It is characterized in that The protruding dimension of the convex portion is set to be larger than the axial dimension of the first region.

4. A wheel bearing device with a rotation speed detection device, comprising: An outer member having two rows of outer track surfaces on the inner periphery; An inner square member, comprising a hub ring and at least one inner ring, wherein the inner square member has two rows of inner track surfaces on the outer periphery thereof facing the two rows of outer track surfaces, the hub ring is formed with a small-diameter step portion extending in the axial direction on the outer periphery thereof, and the at least one inner ring is pressed into the small-diameter step portion; Two rows of rolling elements, which are respectively accommodated between the track surface of the outer member and the track surface of the inner member in a freely rolling manner; a pulse ring engaged with the inner ring, the magnetic properties of the pulse ring changing alternately and at equal intervals along the circumferential direction; and a rotation speed sensor disposed opposite to the pulse ring with an air gap therebetween, It is characterized in that The wheel bearing device with a rotation speed detection device further includes a bearing cap according to any one of claims 1 to 3, wherein the bearing cap is attached to an inner end portion of the outer member.

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