JP2012132770A - Rotation speed detector and wheel bearing device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation speed detector which ensures a space for avoiding an interference between a drive shaft and an output line in a diametrical direction of the drive shaft, and eliminates the need of providing a notch and the like on an outer peripheral portion of the drive shaft, and a wheel bearing device provided with the same.SOLUTION: A rotation speed detector 4 comprises: an annular sensor installing member 17 fixed to an external member 7 of a bearing 2; a sensor element installed to the sensor installing member 17 and detecting the rotation speed of an axle; and a rotation speed sensor 18 having a harness 19 for external connection for connecting to the sensor element. In the rotation speed sensor 18, the harness 19 is pulled out along a virtual surface orthogonal to an axis of the sensor installing member 17.

Description

  The present invention relates to a rotational speed detector and a wheel bearing device including the same.

  A conventional wheel bearing device includes an inner member that can rotate around a central axis, an outer member that is disposed on the outer periphery of the inner member, and the outer member and the inner member. Interposing double row rolling elements, a pulsar ring facing the rolling element on the vehicle inner side of the double row rolling elements, and an ABS sensor (Anti-Lock Brake System) for detecting the rotational speed of the drive shaft together with the pulsar ring, (For example, Patent Document 1).

  The inner member includes a hub ring and an inner ring, and is disposed so as to be rotatable on the central axis. The hub wheel has a wheel mounting flange on the outer peripheral surface, and is attached to the wheel via the wheel mounting flange. The inner ring has an inner raceway surface on the outer circumferential surface for rolling the double row rolling elements, and is attached to the outer circumferential surface of the hub ring.

  The outer member has a flange for mounting the vehicle body on the outer peripheral surface and an outer raceway surface for rolling the double row rolling elements on the inner peripheral surface, and is attached to the vehicle body side via the knuckle of the suspension device. Yes. The outer member is configured to function as an outer ring of the wheel bearing device.

  The double row rolling elements are formed of balls, and are arranged so as to be able to roll while being interposed between the outer raceway surface of the outer member and the inner raceway surface of the inner ring.

  The pulsar ring is composed of a magnet having N and S poles magnetized along the circumferential direction, and is attached to the outer peripheral surface of the inner ring.

  The ABS sensor has an IC (Integrated Circuit) chip for magnetic detection for connecting an output line (harness), and a package for resin-sealing the IC chip, and an outer peripheral surface of the outer ring via an annular sensor mounting member. Attached. The harness is pulled out from the package along the axial direction of the sensor mounting member.

  With the above configuration, when the wheel rotates as the vehicle travels, the hub wheel and the inner ring rotate together with the wheel because the wheel is attached to the hub wheel.

JP 2010-230593 A

  However, according to the wheel bearing device shown in Patent Document 1, a space for avoiding interference between the drive shaft and the harness is formed in the axial direction of the sensor mounting member. It was necessary to provide a notch or the like on the outer periphery of the shaft.

  Therefore, an object of the present invention is to secure a space for avoiding interference between the drive shaft and the harness in the radial direction of the drive shaft, thereby eliminating the need to provide a notch or the like on the outer periphery of the drive shaft. An object of the present invention is to provide a rotational speed detector that performs the above and a wheel bearing device including the same.

  In order to achieve the above object, the present invention provides a rotational speed detector (1) to (8) and a wheel bearing device including the same.

(1) An annular sensor mounting member fixed to the outer member of the bearing, a sensor element mounted on the sensor mounting member for detecting the rotational speed of the axle, and an external connection connected to the sensor element A rotational speed sensor having an output line, wherein the rotational speed sensor is drawn along a virtual plane perpendicular to the axis of the sensor mounting member.

(2) In the rotational speed detector according to (1), the rotational speed sensor includes a package formed by resin-sealing the sensor element.

(3) In the rotational speed detector according to (2), the sensor mounting member passes through a plurality of trunks having different diameters and at least one of the plurality of trunks. The package is formed by a stepped annular member having a through window, and the rotational speed sensor is provided with a slit in the package for inserting an opening edge of the through window.

(4) In the rotational speed detector according to (3), the sensor mounting member has a positioning piece for positioning the rotational speed sensor on one side in the circumferential direction, and the positioning piece is the plurality of cylinders. It is provided by cutting and forming a part of the part.

(5) In the rotational speed detector according to (4), a coupling member that couples a package mounting member that passes through the positioning piece is embedded in the package.

(6) In the rotational speed detector according to (3), the rotational speed sensor is attached by inserting an opening edge of the through window into the slit from a radially inner side of the sensor attachment member.

(7) In the rotational speed detector according to (3), the rotational speed sensor is attached by inserting an opening edge of the through window into the slit from a radially outer side of the sensor attachment member.

(8) An inner member that rotates together with the axle, an outer member that is fixed to the vehicle body side, a bearing having a plurality of rolling elements that roll between the outer member and the inner member, and the bearing A wheel bearing device comprising: the rotation speed detector according to any one of (1) to (7) disposed on an axis.

  According to the present invention, a space for avoiding interference between the drive shaft and the output line can be secured in the radial direction of the drive shaft, and it is not necessary to provide a notch or the like on the outer peripheral portion of the drive shaft.

Sectional drawing shown in order to demonstrate the whole wheel bearing apparatus which concerns on the 1st Embodiment of this invention. The perspective view shown in order to demonstrate the rotational speed detector of the bearing apparatus for wheels which concerns on the 1st Embodiment of this invention. Sectional drawing shown in order to demonstrate the rotational speed detector of the wheel bearing apparatus which concerns on the 1st Embodiment of this invention. The right view shown in order to demonstrate the rotational speed detector of the bearing apparatus for wheels which concerns on the 1st Embodiment of this invention. The left view shown in order to demonstrate the rotational speed detector of the bearing apparatus for wheels which concerns on the 1st Embodiment of this invention. The perspective view shown in order to demonstrate the rotational speed sensor of the wheel bearing apparatus which concerns on the 1st Embodiment of this invention. The perspective view shown in order to demonstrate the whole wheel bearing apparatus which concerns on the 2nd Embodiment of this invention. Sectional drawing shown in order to demonstrate the rotational speed detector of the wheel bearing apparatus which concerns on the 2nd Embodiment of this invention. The perspective view shown in order to demonstrate the rotational speed sensor of the wheel bearing apparatus which concerns on the 2nd Embodiment of this invention.

[First embodiment]
Hereinafter, a wheel bearing device according to a first embodiment of the present invention will be described in detail with reference to the drawings.

(Whole configuration of wheel bearing device)
FIG. 1 shows the entire wheel bearing device. As shown in FIG. 1, the wheel bearing device 1 includes a bearing 2, a seal mechanism 3, and a rotational speed detector 4, and is disposed between a vehicle body (not shown) and a stem 5 of a constant velocity universal joint. ing.

  The stem 5 includes three large, medium, and small body portions 5a, 5b, and 5c (large diameter body portion 5a, small diameter body portion 5b, and intermediate diameter body portion 5c) having different outer diameters, and both body portions 5a to 5c. Are provided with stepped surfaces 5d and 5e respectively interposed between two mutually adjacent body parts 5a and 5b and between body parts 5b and 5c, and the whole is formed by a stepped shaft. The stem 5 is formed with a serration fitting portion 5f for connecting to a hub wheel 9 of an inner member 6 (described later). The serration fitting portion 5 f is disposed on the outer peripheral surface of the small diameter barrel portion 5 b of the stem 5.

(Configuration of bearing 2)
The bearing 2 includes an inner member 6 that can rotate around the central axis O, an outer member 7 that is disposed on the outer periphery of the inner member 6, and a space between the outer member 7 and the inner member 6. Are arranged between the outer peripheral surface of the small-diameter barrel portion 5b of the stem 5 and the vehicle body.

  The inner member 6 includes a hub wheel 9 and an inner ring 10, is rotatably arranged on the central axis O, and is connected to a drive shaft (not shown) so as to be able to transmit torque via a constant velocity universal joint or the like. Yes. And the inward member 6 is comprised so that it may rotate with a drive shaft.

  The hub wheel 9 has two body portions 9a and 9b having different outer diameters, and is attached to the small diameter body portion 5b of the stem 5, and is entirely formed of a cylindrical molded body made of, for example, carbon steel for machine structure. Is formed. In the present embodiment, JISS55C is used as a material for the hub wheel 9. The hub wheel 9 is provided with a through hole 9c that opens in both directions along the central axis O. A serration fitting portion 9d that fits into the serration fitting portion 5f of the stem 5 so as not to be relatively rotatable is formed on the inner peripheral portion of the through hole 9c.

  The large-diameter trunk portion 9a is disposed on the vehicle outer side of the hub wheel 9 (left side in FIG. 1). The large-diameter trunk portion 9a is integrally provided with an annular wheel mounting flange (not shown) that protrudes from the outer peripheral surface and attaches a wheel (not shown).

  The small-diameter trunk portion 9b has a race attachment portion 90b for attaching the inner ring 10 on the outer peripheral surface, and is disposed on the vehicle inner side (right side in FIG. 1) of the hub wheel 9.

  The inner ring 10 is fixed to the race mounting portion 90b of the hub ring 9, and is entirely formed of a cylindrical molded body made of, for example, high carbon chrome bearing steel. In the present embodiment, JISSUJ2 is used as the material of the inner ring 10.

  An inner raceway surface 10a for rolling the rolling elements 8 and a seal attachment surface 10c adjacent to the inner raceway surface 10a via a partition portion 10b are provided on the outer peripheral surface of the inner ring 10.

  The inner raceway surface 10 a is disposed on the vehicle outer side of the inner ring 10. The partition portion 10b is disposed between the inner raceway surface 10a and the seal attachment surface 10c, and has a cylindrical body having an outer diameter larger than the outer diameter of the inner raceway surface 10a and the outer diameter of the seal attachment surface 10c. It is formed by the part. The seal attachment surface 10c is disposed on the vehicle inner side of the inner ring 10.

  The outer member 7 has an outer raceway surface 7a for rolling the rolling element 8 on the inner peripheral surface, and is fixed to the vehicle body side via a knuckle (not shown) of a suspension device (not shown). It is formed by a cylindrical molded body made of, for example, carbon steel for machine structure that opens in both directions of the central axis O. In the present embodiment, JISS55C is used as the material of the outer member 7. The outer member 7 is configured to function as an outer ring of the wheel bearing device 1.

  A seal attachment surface 7 b for attaching the seal mechanism 3 is provided on the inner peripheral surface of the outer member 7 together with the seal attachment surface 10 c of the inner ring 10. A sensor mounting surface 7 c for mounting the rotation speed detector 4 is provided on the outer peripheral surface of the outer member 7.

  The rolling element 8 is made of, for example, a ball, and is disposed between the inner raceway surface 10a of the inner ring 10 and the outer raceway surface 7a of the outer member 7, and is held by the ball holder 11 so as to be able to roll. Yes.

(Configuration of seal mechanism 3)
The seal mechanism 3 includes a seal member 12 and a slinger 13, and is disposed between the seal attachment surface 10 c of the inner ring 10 and the seal attachment surface 7 b of the outer member 7.

  The seal member 12 includes a metal core 14 and a seal portion 15, and is disposed on the inner periphery of the outer member 7.

  The core metal 14 has a cylindrical rising portion 14a, is press-fitted into the outer member 7 and attached to the seal attachment surface 7b, and is entirely formed of an annular member made of a material such as an austenitic stainless steel plate. ing.

  The seal portion 15 includes a side lip 15a slidably contacting the flange 13a of the slinger 13, a grease lip 15b slidably contacting the outer peripheral surface of the slinger 13 on the vehicle outer side, and a dust lip 15c slidably contacting the outer peripheral surface of the slinger 13 on the vehicle inner side. And is joined to the metal core 14 and formed entirely by a ring member made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber).

  The slinger 13 has a flange 13a opposed to the metal core 14 with a seal portion 15 interposed therebetween. The slinger 13 is press-fitted into the inner ring 10 and attached to the seal attachment surface 10c. The cylinder is made of a material such as an austenitic stainless steel plate as a whole. It is formed by a member.

  A pulsar ring 16 is attached to the slinger 13 with its end face abutting against the end face of the flange 13a.

  The pulsar ring 16 is formed of an annular member having a plurality of through holes (not shown) arranged at equal intervals in the circumferential direction at the outer peripheral edge thereof. As the pulsar ring 16, for example, a sintered metal using ferritic stainless steel powder is used.

(Configuration of rotational speed detector 4)
2 to 5 show a rotational speed detector. FIG. 6 shows a rotation speed sensor. 2 to 6, the rotational speed detector 4 includes a sensor mounting member 17 and a rotational speed sensor 18, and includes a step surface 5d (shown in FIG. 1) of the stem 5 and a seal mechanism 3 (shown in FIG. 1). Between the bearing 2 (shown in FIG. 1).

  The sensor mounting member 17 includes a plurality of body portions 17a to 17c having different diameters, step portions 17d and 17e interposed between adjacent body portions among the body portions 17a to 17c, and a plurality of body portions 17a. ˜17c, which has a notch 17f as a through window that cuts out the body portion 17c having the smallest inner and outer diameters and penetrates the stepped portion 17e, and is located outside the intermediate diameter body portion 5c of the stem 5 (shown in FIG. 1). It is arrange | positioned around and it is attached to the sensor attachment surface 7c (shown in FIG. 1) of the outer member 7, and the whole is formed of a stepped annular member made of, for example, an austenitic stainless steel plate.

  The sensor mounting member 17 is provided with a positioning piece 170c for positioning the rotational speed sensor 18 on one side in the circumferential direction.

  The positioning piece 170c is provided by cutting and forming a part of the body part 17c among the plurality of body parts 17a to 17c.

  The rotation speed sensor 18 includes an ABS sensor having a sensor element (not shown), a harness 19 and a package 20, and is attached to the sensor attachment member 17 by a bolt 21 as a package attachment member that passes through the positioning piece 170c. The rotational speed sensor 18 is configured to detect the rotational speed of the wheel (drive shaft) as a change in frequency.

  The sensor element is composed of, for example, an IC chip such as a Hall element, and is opposed to the outer peripheral edge of the pulsar ring 16 with a predetermined interval and is resin-sealed in the package 20. The sensor element converts the frequency that changes based on the magnetic field fluctuation caused by the rotation of the drive shaft into an electrical signal, and outputs the electrical signal to an ECU (Electronic Control Unit: not shown) for the vehicle via the harness 19. It is configured.

  The harness 19 is drawn out of the package 20 along an imaginary plane orthogonal to the axis of the sensor mounting member 17 as an output line of the sensor element, and is connected to a vehicle ECU. In the present embodiment, the harness 19 is pulled out along the circumferential direction of the sensor mounting member 17 when the harness is pulled out. Thereby, the space S (shown in FIG. 4) for avoiding interference between the stem 5 (drive shaft) and the harness 19 can be secured in the radial direction of the drive shaft.

  The package 20 has a base portion 20a that houses the sensor element and a protruding portion 20b that protrudes from the base portion 20a. The package 20 is attached to the sensor mounting member 17 in contact with the stepped surface 17e, and is entirely attached to the outer periphery of the body portion 17c. For example, it is formed of a curved member made of a synthetic resin such as an epoxy resin that matches the surface.

  A nut 22 as a coupling member for coupling the bolt 21 is embedded in the package 20, and a slit 23 for inserting the opening edge 170 f of the notch 17 f from the radially inner side of the sensor mounting member 17 is formed.

  The nut 22 is made of, for example, a cap nut, and a part of the nut 22 is exposed to the outside of the package 20 and is disposed in the end portion of the package 20 opposite to the harness pulling side end portion. Accordingly, the bolt 21 can be moved along the radial direction of the sensor mounting member 17 and coupled to the nut 22 in the positioning state of the rotational speed sensor 18 with respect to the positioning piece 170 c of the sensor mounting member 17.

  The slit 23 is disposed on the opposite side of the package 20 from the side where the nut 22 is embedded, and is interposed between the base portion 20a and the protruding portion 20b. The slit 23 is a package along the axial direction of the sensor mounting member 17, with the opening edge 170 f of the notch 17 f interposed between the inner surfaces of the two slits facing each other when the rotational speed sensor 18 is mounted on the sensor mounting member 17. It is comprised so that the movement of 20 may be controlled. Thereby, the position shift accompanying the vibration of the rotation speed sensor 18, etc. is suppressed.

  In the rotational speed detector 4 of the wheel bearing device 1 configured as described above, the rotational speed sensor 18 is assembled to the sensor mounting member 17 as follows. First, the rotational speed sensor 18 is moved from the radially inner side of the sensor mounting member 17 to the radially outer side, and the opening edge 170 f of the notch 17 f is inserted into the slit 23 of the package 20. Next, the rotational speed sensor 18 is moved in the circumferential direction of the sensor mounting member 17 along the stepped portion 17e until it contacts the positioning piece 170c. Thereafter, the bolt 21 is inserted into the positioning piece 170 c and coupled to the nut 22.

(Assembly of rotation speed detector 4)
Next, a method for assembling the rotational speed detector 4 shown in the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the assembly method of the rotational speed detector 4 shown in the present embodiment is such that the seal mechanism 3 and the pulsar ring are placed between the seal attachment surface 10c of the inner ring 10 and the seal attachment surface 7b of the outer member 7. In the bearing 2 in which 16 is disposed in advance, the sensor element in the package 20 of the rotational speed sensor 18 is opposed to the outer peripheral edge of the pulsar ring 16, and the body portion 17 a of the sensor mounting member 17 is attached to the sensor of the outer member 7. This is done by attaching to the surface 7c.

  In this case, when the sensor attachment member 17 is attached to the sensor attachment surface 7c, the harness 19 of the rotational speed sensor 18 is pulled out along the circumferential direction of the sensor attachment member 17 as shown in FIG. In addition, the head of the bolt 21 is disposed in a mounting region of the sensor mounting member 17 and in a plane orthogonal to the axial direction of the stem 5.

  Therefore, in the present embodiment, it is possible to secure a space S in the radial direction of the stem 5 for avoiding interference between the drive shaft, the harness 19 and the bolt 21 when the rotational speed detector 4 is assembled to the bearing 2. it can.

(Operation of the wheel bearing device 1)
The operation of the wheel bearing device 1 shown in the present embodiment is performed similarly to the operation of the conventional wheel bearing device. That is, when torque is transmitted from the engine side of the vehicle to the hub wheel 9 via the drive shaft and the constant velocity universal joint, the hub wheel 9 rotates together with the inner ring 10. Since the wheel is attached to the hub wheel 9, torque from the engine side is also transmitted to the wheel, and the wheel rotates together with the hub wheel 9.

[Effect of the first embodiment]
According to the first embodiment described above, the following effects can be obtained.

  A space S for avoiding interference between the drive shaft, the harness 19 and the bolt 21 can be secured in the radial direction of the stem 5, and it is not necessary to provide a notch or the like on the outer peripheral portion of the drive shaft.

[Second Embodiment]
Next, a rotational speed detector according to a second embodiment of the present invention will be described with reference to FIGS. 7 and 8 show a rotational speed detector. FIG. 9 shows a rotational speed sensor. 7-9, the same code | symbol is attached | subjected about the same or equivalent member as FIG.2, FIG.3 and FIG.6, and detailed description is abbreviate | omitted.

  As shown in FIGS. 7 to 9, in the rotational speed detector 71 according to the second embodiment of the present invention, the rotational speed sensor 72 detects the opening edge of the notch 17 f from the outside in the radial direction of the sensor mounting member 17. It is characterized by being inserted into the slit 23 and attached.

  For this reason, the sensor mounting member 17 is provided with a notch 17f that cuts out the body portion 17c and penetrates the body portion 17b and the stepped surface 17e.

  The sensor mounting member 17 is provided with a movement restricting piece 17g for restricting the movement of the rotational speed sensor 72 inward in the radial direction.

  On the other hand, the rotation speed sensor 72 is attached to the sensor attachment member 17 with the package 20 in contact with the movement restricting piece 17g.

  The package 20 has a slit 23 into which the opening edge 170f of the notch 17f is inserted from the outside in the radial direction of the sensor mounting member 17.

  The slit 23 is disposed between the base portion 20a and the protruding portion 20b on the embedded side of the nut 22 (shown in FIG. 4) in the package 20.

  In the rotational speed detector 71 configured as described above, the rotational speed sensor 72 is assembled to the sensor mounting member 17 as follows. First, the rotational speed sensor 72 is moved from the radially outer side of the sensor mounting member 17 to the radially inner side, and the opening edge 170f of the notch 17f is slit into the slit of the package 20 until the base portion 20a of the package 20 contacts the movement restricting piece 17g. 23. Next, the rotational speed sensor 18 is moved in the circumferential direction of the sensor mounting member 17 along the stepped portion 17e until it contacts the positioning piece 170c. Thereafter, the bolt 21 is inserted into the positioning piece 170 c and coupled to the nut 22.

  Further, the method for assembling the rotational speed detector 71 to the bearing 2 is performed in the same manner as the method for assembling the rotational speed detector 4 shown in the first embodiment.

  That is, the rotational speed detector 71 is assembled in the bearing 2 in which the seal mechanism 3 and the pulsar ring 16 are disposed in advance between the seal mounting surface 10 c of the inner ring 10 and the seal mounting surface 7 b of the outer member 7. (Shown in FIG. 1), the sensor element in the package 20 of the rotational speed sensor 72 is opposed to the outer peripheral edge of the pulsar ring 16, and the body 17a of the sensor mounting member 17 is mounted on the sensor mounting surface 7c of the outer member 7. Is done.

  In this case, when the sensor attachment member 17 is attached to the sensor attachment surface 7 c, the harness 19 of the rotational speed sensor 72 is pulled out along the circumferential direction of the sensor attachment member 17. In addition, the head of the bolt 21 is disposed in a mounting region of the sensor mounting member 17 and in a plane orthogonal to the axial direction of the stem 5.

  Therefore, in the present embodiment, as in the first embodiment, the space S for avoiding the interference between the drive shaft, the harness 19 and the bolt 21 when the rotational speed detector 71 is assembled to the bearing 2 is stemmed. 5 can be secured in the radial direction.

[Effect of the second embodiment]
According to the second embodiment described above, the same effects as those shown in the first embodiment can be obtained.

  As mentioned above, although the rotational speed detector and the wheel bearing apparatus of this invention were demonstrated based on said embodiment, this invention is not limited to said embodiment, In the range which does not deviate from the summary. The present invention can be implemented in various modes, and for example, the following modifications are possible.

(1) In the above embodiment, the case where the sensor elements of the rotational speed sensors 18 and 72 are Hall elements has been described. However, the present invention is not limited to this, and the sensor elements such as magnetoresistive elements may be used. Of course.

(2) In the above-described embodiment, the case where the rolling element 8 is applied to a bearing device that is a ball has been described. However, the present invention is not limited to this, and the bearing device is a cylindrical roller, a needle roller, or a tapered roller. Is also applicable in the same manner as in the embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Wheel bearing apparatus, 2 ... Bearing, 3 ... Seal mechanism, 4 ... Rotational speed detector, 5 ... Stem, 5a ... Large diameter trunk | drum, 5b ... Small diameter trunk | drum, 5c ... Intermediate diameter trunk | drum, 5d, 5e ... Step surface, 5f ... Serration fitting, 6 ... Inner member, 7 ... Outer member, 7a ... Outer raceway surface, 7b ... Seal mounting surface, 7c ... Sensor mounting surface, 8 ... Rolling element, 9 ... Hub wheel , 9b: Small diameter body portion, 90b: Race attachment portion, 9c: Through hole, 9d ... Serration fitting portion, 10 ... Inner ring, 10a ... Inner raceway surface, 10b ... Partition portion, 10c ... Seal attachment surface, 11 ... Ball holding 12 ... Sealing member, 13 ... Slinger, 13a ... Flange, 14 ... Core metal, 14a ... Rising part, 15 ... Sealing part, 15a ... Side lip, 15b ... Grease lip, 15c ... Dustrip, 16 ... Pulsar ring, 17 ... Sensor mounting member, 1 a to 17c: trunk portion, 170c: positioning piece, 17d, 17e ... stepped portion, 17f ... notch, 170f ... opening edge, 17g: movement regulating piece, 18 ... rotational speed sensor, 19 ... harness, 20 ... package, 20a ... base, 20b ... projection, 21 ... bolt, 22 ... nut, 23 ... slit, 71 ... rotation speed detector, 72 ... rotation speed sensor, O ... center axis, S ... space

Claims (8)

An annular sensor mounting member fixed to the outer member of the bearing;
A sensor element attached to the sensor attachment member for detecting the rotational speed of the axle, and a rotational speed sensor having an output line for external connection connected to the sensor element;
The rotational speed sensor is drawn along a virtual plane in which the output line is orthogonal to the axis of the sensor mounting member.   The rotation speed detector according to claim 1, wherein the rotation speed sensor includes a package formed by sealing the sensor element with resin. The sensor mounting member is formed by a stepped annular member having a plurality of barrels having different diameters, and a through window penetrating at least one of the plurality of barrels.
The rotational speed detector according to claim 2, wherein the rotational speed sensor is provided with a slit in the package for inserting an opening edge of the through window.   The sensor mounting member has a positioning piece for positioning the rotational speed sensor on one side in the circumferential direction, and the positioning piece is provided by cutting and forming a part of the plurality of body parts. Item 4. The rotational speed detector according to Item 3.   The rotational speed detector according to claim 4, wherein the rotational speed sensor has a coupling member embedded in the package for coupling a package mounting member that passes through the positioning piece.   The rotation speed detector according to claim 3, wherein the rotation speed sensor is attached by inserting an opening edge of the through window into the slit from a radially inner side of the sensor attachment member.   The rotational speed detector according to claim 3, wherein the rotational speed sensor is attached by inserting an opening edge of the through window into the slit from outside in a radial direction of the sensor attachment member. An inner member that rotates together with the axle, an outer member that is fixed to the vehicle body, and a bearing that has a plurality of rolling elements that roll between the outer member and the inner member;
The wheel bearing apparatus provided with the rotational speed detector of any one of Claim 1 thru | or 7 arrange | positioned on the axis line of the said bearing.

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