JP4853728B2 - Rotation detection sensor mounting structure and hub unit - Google Patents

Description

  The present invention relates to a rotation detection sensor mounting structure and a hub unit including such a rotation detection device.

  Generally, a rotation detection device that detects the rotation speed of a wheel is attached to a hub unit of an automobile. The rotation detection device is used, for example, as information input means for an anti-lock brake system (ABS) of an automobile. For example, the rotation detection device includes a pulsar ring that is fixed to the inner ring side of the hub unit and a sensor that is held by a support ring (annular cover body) that is fixed to the outer ring side, and that rotates as the wheel rotates. The rotation change is detected by a sensor.

  In such a rotation detection sensor mounting structure, the head portion of the sensor is pushed from the radial direction into a holding portion (sensor holder) formed on the support ring, and a resilient piece (clip portion) formed on the holding portion is provided. The head portion is pressed and fixed by engaging with an engaging portion (locking groove) of the head portion. At that time, there is one that positions the head portion in the radial direction by bringing the tip surface of the head portion of the sensor into contact with the inner surface of the elastic base portion of the elastic piece of the annular cover body (see Patent Documents 1 and 2). .

JP 2005-241351 A JP 2005-315632 A

  According to these technologies, the head portion of the sensor can be easily positioned in the radial direction, but the external force in the axial direction due to collision of a foreign object is caused by the contact between the tip surface of the head portion and the inner surface of the elastic base of the elastic piece. Since it acts on the sensor as a rotational moment centered on the position, the head portion tends to fall (tilt). Therefore, in these documents, a head frame is provided by providing a bottom frame on the bullet base of the bullet piece (Patent Document 1) or providing a claw part on the bullet base of the bullet piece (Patent Document 2). The fall of the squeeze is reduced, and the escape in the radial direction is prevented. However, if the head portion tries to fall while the tip surface of the head portion and the inner surface of the elastic base portion of the elastic piece are in contact, the head portion of the sensor is bent or twisted, and the rotation detection accuracy of the sensor is lowered. There is a fear.

  It is an object of the present invention to easily position the head portion in the radial direction relative to the holding portion of the annular cover body and prevent the head portion from coming out in the radial direction, and to detect the rotation with high accuracy so that the head portion is not easily bent or twisted. An object of the present invention is to provide a rotation detection sensor mounting structure that can be used and a hub unit including such a rotation detection device.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the rotation detection sensor mounting structure of the present invention is
A wheel unit is rotatably supported by an inner ring of a hub unit that is fixed to a vehicle body via an outer ring, and a rotation change of a pulsar ring that is fixed to a vehicle inner side end portion in the axial direction of the inner ring of the hub unit is detected. A rotation detection sensor mounting structure for pressing and fixing a sensor head portion from a radial direction to a holding portion provided on an annular cover body fixed to an outer ring of the hub unit so as to face the pulsar ring,
The annular cover body has a cylindrical peripheral wall, and an annular wall extending radially inward from a vehicle inner side end of the peripheral wall,
The holding portion of the annular cover body is formed in the head portion by pressing from the vehicle inner side with a guide piece for guiding the sensor head portion pushed in along the pushing direction on the vehicle outer side in the axial direction. And holding the head portion so as to be sandwiched from the axial direction,
The projecting piece is bent from the inner peripheral edge of the annular wall, and is bent radially outward from the upper end of the projecting base, and the engagement portion of the head unit is pressed and engaged in the middle portion. A resiliently acting part formed with a pressing part to be
On both sides of the head portion in the pushing direction, bulge portions bulging outward are formed,
The elastic pieces have receiving portions for positioning the head portion in the radial direction on both sides of the pressing direction by receiving the front end surface of the protruding portion in the pressing direction in the vicinity of the engaging position with the engaging portion. Each projecting ,
In the impact acting portion, the receiving position of the distal end surface of the bulging portion by the receiving portion corresponds to the receiving portion being formed closer to the resilient base portion than the pressing portion. Is located on the front side in the pushing direction with respect to the engagement position with the engagement portion,
The head portion is received in the receiving portion and positioned in the radial direction, and is pressed in the axial direction by the pressing action of the bullet piece and pressed and held forward in the pushing direction,
In the state in which the head portion is positioned, the tip surface of the head portion is not in contact with the inner surface of the bullet base of the bullet piece, so that the tip surface of the bullet piece is in contact with the bullet base of the bullet piece. It is set so that it may space apart from an inner surface .

  In this manner, the head portion can be positioned in the radial direction by the receiving portion of the bullet piece receiving the tip surface of the bulging portion. In addition, since the contact position between the receiving part of the projectile piece and the tip surface of the bulging part is located in the vicinity of the engagement position between the projectile piece and the engaging part, the external force in the axial direction due to the collision of a foreign object, etc. Even if it acts on the sensor as a rotational moment centered on the contact position, the head portion is less likely to fall (tilt). Thereby, it is possible to prevent the head portion from coming out in the radial direction. Furthermore, since the front end surface of the head portion can be prevented from coming into contact with the inner surface of the elastic base portion of the elastic piece, the head portion of the sensor is not easily bent or twisted, and the sensor can detect rotation with high accuracy.

  That is, the head portion of the sensor is arranged so that the tip surface of the head portion does not come into contact with the inner surface of the elastic base portion of the elastic piece even if the head portion is tilted by an external force acting in the axial direction due to a collision of a foreign object or the like. It is desirable that the front end surface of the ring cover is separated from the inner surface of the elastic base of the elastic piece of the annular cover body. This makes it difficult for the head portion of the sensor to be bent or twisted, so that the sensor can detect rotation with high accuracy.

Further, the receiving position of the tip surface of the bulging part by the receiving part is located on the front side in the pushing direction with respect to the engaging position between the bullet piece and the engaging part,
While the sensor head portion is received by the receiving portion and positioned in the radial direction, it can be pressed in the axial direction by the pressing action of the elastic piece and pressed and held forward in the pushing direction.

  By receiving the leading end surface of the bulging portion at the receiving portion, the head portion of the sensor is positioned in the radial direction at the holding portion, and the pressing action of the projectile piece from the receiving position toward the front side from the rear side in the pushing direction ( (Ballistic action) can be exerted on the sensor head. This makes it easier to position the sensor head in the radial direction and prevent it from coming out in the radial direction.

  Furthermore, when the receiving portion is formed with a flat surface in a direction perpendicular to the surface of the pulsar ring magnetized rotor, and the tip surface of the bulging portion is received by the flat surface, the head portion is bent or twisted. Is less likely to occur, and rotation can be detected with higher accuracy.

  In addition, the receiving part which has such a flat surface can be formed by bend | folding the both sides of the elastic action part of an elastic piece to the vehicle outer side along the bending line of a pushing direction, respectively. In this manner, the receiving portion can be easily and inexpensively formed on the annular cover body (holding portion) by bending both sides of the base end portion of the elastic piece.

Therefore, in order to solve the above problems, the hub unit of the present invention is
A head portion of a sensor for detecting a rotational change of a pulsar ring fixed to a vehicle inner side end portion in an axial direction of the inner ring, while being fixed to a vehicle body via an outer ring and rotatably supporting the wheel by an inner ring; A hub unit including a rotation detecting device that is pushed in from a radial direction and fixed to a holding portion provided in an annular cover body fixed to the outer ring so as to face a pulsar ring,
The annular cover body has a cylindrical peripheral wall, and an annular wall extending radially inward from a vehicle inner side end of the peripheral wall,
The holding portion of the annular cover body is formed in the head portion by pressing from the vehicle inner side with a guide piece for guiding the sensor head portion pushed in along the pushing direction on the vehicle outer side in the axial direction. And holding the head portion so as to be sandwiched from the axial direction,
The projecting piece is bent from the inner peripheral edge of the annular wall, and is bent radially outward from the upper end of the projecting base, and the engagement portion of the head unit is pressed and engaged in the middle portion. A resiliently acting part formed with a pressing part to be
On both sides of the head portion in the pushing direction, bulge portions bulging outward are formed,
The elastic pieces have receiving portions for positioning the head portion in the radial direction on both sides of the pressing direction by receiving the front end surface of the protruding portion in the pressing direction in the vicinity of the engaging position with the engaging portion. Each projecting ,
In the impact acting portion, the receiving position of the distal end surface of the bulging portion by the receiving portion corresponds to the receiving portion being formed closer to the resilient base portion than the pressing portion. Is located on the front side in the pushing direction with respect to the engagement position with the engagement portion,
The head portion is received in the receiving portion and positioned in the radial direction, and is pressed in the axial direction by the pressing action of the bullet piece and pressed and held forward in the pushing direction,
In the state in which the head portion is positioned, the tip surface of the head portion is not in contact with the inner surface of the bullet base of the bullet piece, so that the tip surface of the bullet piece is in contact with the bullet base of the bullet piece. It is characterized by comprising a rotation detection device set so as to be separated from the inner surface .

  Accordingly, in the rotation detection device provided in the hub unit, the head portion can be easily positioned in the radial direction and prevented from coming out in the radial direction with respect to the holding portion of the annular cover body, and the head portion can be bent or twisted. It is difficult to detect rotation with high accuracy.

(Example)
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a diagram showing an example of a cross-sectional structure of a hub unit equipped with a rotation detection device of the present invention, FIG. 2 is an exploded perspective view showing an example of a rotation detection device according to an embodiment of the present invention, and FIG. FIG. 4 is a perspective view showing an example of a holding portion, a plan view, a front view and a side view, and FIG. 5 is an example of a state in which a head portion is attached to the holding portion. FIG. 6 is a side view of FIG. In FIG. 1, the left side in the figure is the vehicle outer side, and the right side in the figure is the vehicle inner side.

  As shown in FIG. 1, the hub unit 1 is interposed between a drive axle 2 and an axle case 3, and rotatably supports a wheel (drive axle 2) (not shown) with respect to the vehicle body (axle case 3). ing. The hub unit 1 includes a hub wheel 4 and a rolling bearing 5.

  The hub wheel 4 has a shaft portion 41 that is spline-fitted to the drive axle 2, and a hub flange 42 that fixes a wheel (not shown) to the vehicle outer side end portion of the shaft portion 41. A bolt insertion hole 43 a through which the bolt 43 is inserted is formed in the hub flange 42, and the wheel is fixed through the bolt 43.

  The rolling bearing 5 is formed of a double-row outward angular ball bearing. Specifically, the rolling bearing 5 uses a part of the outer peripheral surface of the shaft portion 41 of the hub wheel 4 as an inner ring on the vehicle outer side, and is a single unit on the vehicle inner side that is press-fitted and fitted to the outer periphery of the shaft portion 41. An inner ring 51 for rows, an outer ring 52 that is press-fitted into the inner periphery of the axle case 3 and has double row (two rows) raceway grooves, and a plurality of balls 53 (rolling elements) arranged in double rows And two crown-shaped cages 54, 54. Therefore, in this embodiment, the outer ring 52 is not rotated and the inner ring 51 (hub wheel 4) is rotated.

  Next, the rotation detection device 6 that is attached to the vehicle inner side end of the hub unit 1 as described above and detects the rotation change of the wheels (not shown) and the drive axle 2 will be described. As shown in FIG. 2, the rotation detection device 6 detects an annular pulsar ring 60 in which magnetic poles (N pole and S pole) having different polarities are alternately arranged in the circumferential direction, and changes in the rotation of the pulsar ring 60. A sensor head portion 70 and an annular cover body 80 for holding the head portion 70 are provided.

  The pulsar ring 60 includes a pulsar ring main body 61 (magnetized rotor) in which N poles and S poles are alternately magnetized, and a pulsar ring support that fixes the pulsar ring main body 61 to an end face that is cylindrical and extends radially outward. Part 62. The pulsar ring 60 is press-fitted and fitted on the outer periphery of the inner ring 51 of the rolling bearing 5 and is fixed at the vehicle inner side end in the axial direction (see FIG. 1).

  The head unit 70 is made of a polymer material such as resin, and is formed by molding a sensor (not shown) such as an IC (Integrated Circuit) chip having a magnetic circuit. The sensor can detect the rotation of the pulsar ring 60 when a voltage is generated in the magnetic circuit due to a change in magnetic flux density caused by the rotation of the pulsar ring 60. A lead wire 79 is drawn out from the head unit 70.

  The annular cover body 80 has a cylindrical peripheral wall 81 and an annular wall 82 extending radially inward from the vehicle inner side end of the peripheral wall 81, and the annular wall 82 has a predetermined circumferential direction. An opening 82a penetrating in the thickness direction is formed at the position, and a holding portion 83 for holding the head portion 70 on the vehicle inner side is provided corresponding to the opening 82a. Thereby, when the head unit 70 is held by the holding unit 83, the rotation of the pulsar ring 60 is detected through the opening 82a. The annular cover body 80 is press-fitted and fitted on the outer periphery of the outer ring 52 of the rolling bearing 5, and is fixed to the vehicle inner side end in the axial direction so as to face the pulsar ring 60 (see FIG. 1). In addition, when attaching the head part 70 to the holding | maintenance part 83, it has the structure which pushes and fixes the head part 70 to the holding | maintenance part 83 from the radial direction (arrow P direction in FIG. 2) of the cyclic | annular cover body 80.

  Next, detailed aspects of the head unit 70 and the holding unit 83 will be described with reference to FIGS. 3 and 4. As shown in FIG. 3, bulging portions 71 and 71 bulging outward are formed on both side portions 70a and 70a in the pushing direction of the head portion 70, respectively. The head portion 70 includes groove-shaped guide rail portions 72 and 72 extending in the longitudinal direction (pushing direction) on the side portions 70a and 70a on both sides, and an engaging portion 73 having a bellows-like uneven shape on the upper portion 70b. I have.

  Further, the bulging portions 71 and 71 are formed in the intermediate region in the longitudinal direction of the head portion 70. And the front-end | tip surfaces 71a and 71a of the pushing direction of the bulging parts 71 and 71 are received by the receiving parts 86 and 86 of the elastic piece 85 mentioned later (refer FIG. 5, FIG. 6).

  Subsequently, as shown in FIG. 4, the holding portion 83 of the annular cover body 80 is a pair of guides that guide the sensor head portion 70 pushed in along the pushing direction on the vehicle outer side in the axial direction. It has the pieces 84 and 84 and the elastic piece 85 which presses from the vehicle inner side and engages with the engaging part 73 formed in the head part 70. Thereby, the head part 70 can be hold | maintained so that it may be pinched | interposed from an axial direction. In addition, the bullet piece 85 is a receiving portion that receives the distal end surfaces 71a and 71a of the bulging portions 71 and 71 on the front side in the pressing direction with respect to the engaging position between the pressing portion 85c and the engaging portion 73 of the head portion 70. 86 and 86 are formed on both sides in the pushing direction (see FIGS. 5 and 6).

  Specifically, the pair of guide pieces 84 and 84 are formed in a longitudinal shape in which the opening portions 82a of the annular wall 82 are sandwiched from the circumferential direction and the opposing end surfaces 84a and 84a extend in the radial direction. (See FIG. 4A).

  The bullet piece 85 includes a bullet base portion 85a that rises from the inner peripheral edge of the annular wall 82, and a bullet action portion 85b that bends in the radial direction (radially outward) from the upper end of the bullet base portion 85a. Yes. The elastic action portion 85b includes a pressing portion 85c that presses and engages the engaging portion 73 of the head portion 70. That is, the bullet piece 85 is formed so as to go around from the tip of the head unit 70 to the upper part when the head unit 70 is attached to the holding unit 83.

  The catching portions 86, 86 are formed in a form extending so as to hang down from both side portions of the bullet acting portion 85b of the bullet piece 85. Flat surfaces 86a, 86a are formed in the receiving portions 86, 86 in a direction perpendicular to the surface of the pulsar ring main body 61 (see FIG. 2) of the pulsar ring 60, and the flat surfaces 86a, 86a form the distal end surface 71a of the bulging portion 71. , 71a (see FIGS. 5 and 6). And the catching parts 86 and 86 are formed in the elastic base part 85a side rather than the press part 85c in the elastic action part 85b (refer FIG.4 (d)).

  More specifically, the receiving portions 86, 86 having the flat surfaces 86a, 86a are formed by bending the both sides of the elastic acting portion 85b of the elastic piece 85 to the vehicle outer side along the folding line in the pushing direction. be able to. In this way, the receiving portions 86 and 86 can be formed easily and inexpensively on the holding portion 83 of the annular cover body 80 by bending both sides of the elastic action portion 85b of the elastic piece 85.

  Next, a structure for attaching the head unit 70 to the holding unit 83 will be described with reference to FIGS. 5 and 6. As described above, the head unit 70 is fixed at a predetermined position of the holding unit 83 by pushing the head unit 70 toward the holding unit 83 in the radial direction (see FIG. 2). Specifically, the guide rail portion 72 of the head portion 70 is held so that the end portion of the guide piece 84 of the holding portion 83 is fitted. At this time, the end surfaces 84a and 84a of the guide pieces 84 are in contact with or close to the bottoms of the guide rail portions 72 and 72, and the head portion 70 is positioned in the circumferential direction. At the same time, since the end portion of the guide piece 84 enters the groove-shaped guide rail portion 72, positioning in the axial direction is also performed. Accordingly, when the head unit 70 is pushed into the holding unit 83, the head unit 70 is guided in the pushing direction via the guide rail unit 72 and the guide piece 84.

  Further, the pressing portion 85 c of the elastic piece 85 of the holding portion 83 is engaged with the engaging portion 73 of the head portion 70 so as to press. At this time, the pressing portion 85c is engaged with a predetermined recess position of the engaging portion 73, whereby the radial positioning of the head portion 70 with respect to the holding portion 83 is performed. And the front end surfaces 71a and 71a of the bulging parts 71 and 71 which bulge from the both side parts 70a of the head part 70 are the flat surfaces 86a and 86a formed in the receiving parts 86 and 86 of the elastic piece 85, respectively. It is accepted. By receiving the front end surfaces 71a and 71a of the bulging portions 71 and 71 with the flat surfaces 86a and 86a of the receiving portions 86 and 86, the head portion 70 is positioned in the radial direction by the holding portion 83 and is pushed in more than the receiving position. The pressing action (ballistic action) of the bullet piece 85 can be exerted on the head unit 70 from the rear side toward the front side. This facilitates the positioning of the head portion 70 in the radial direction and the prevention of slipping out in the radial direction.

  As shown in FIG. 6, even if the head portion 70 is tilted by an external force acting in the axial direction due to a collision of a foreign object or the like, the tip surface 70 c of the head portion 70 is the elastic base portion 85 a of the elastic piece 85. The tip surface 70 c of the head portion 70 is separated from the inner surface of the bullet base 85 a of the bullet piece 85 so as not to contact the inner surface. This makes it difficult for the head unit 70 to be bent or twisted, so that the sensor can detect rotation with high accuracy.

  In addition, in this invention, it is not limited to the said Example, It can also be set as the Example variously changed within the range of this invention according to the objective and the use. For example, in the above embodiment, the example in which the rotational speed detection device 6 is used for the hub unit 1 for a driving axle of an automobile has been described. However, the rotational speed detecting device 6 may be used for a hub unit for a driven axle or used for other purposes. You may use for a rolling bearing.

The figure which shows an example of the cross-sectional structure of the hub unit equipped with the rotation detection apparatus of this invention. The disassembled perspective view which shows an example of the rotation detection apparatus which concerns on embodiment of this invention. The perspective view which shows an example of a head part, a top view, a front view, and a side view. The perspective view which shows an example of a holding | maintenance part, a top view, a front view, and a side view. The perspective view which shows an example of the state which attached the head part to the holding | maintenance part. The side view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hub unit 2 Drive axle 3 Axle case 4 Hub wheel 5 Rolling bearing 6 Rotation detection device 51 Inner ring 52 Outer ring 60 Pulsar ring 61 Pulsar ring main body (magnetized rotor)
70 sensor head portion 70c tip surface 71 bulging portion 71a tip surface 73 engaging portion 80 annular cover body 83 holding portion 84 guide piece 85 resilient piece 86 receiving portion 86a flat surface

Claims (2)

A wheel unit is rotatably supported by an inner ring of a hub unit that is fixed to a vehicle body via an outer ring, and a rotation change of a pulsar ring that is fixed to a vehicle inner side end portion in the axial direction of the inner ring of the hub unit is detected. A rotation detection sensor mounting structure for pressing and fixing a sensor head portion from a radial direction to a holding portion provided on an annular cover body fixed to an outer ring of the hub unit so as to face the pulsar ring,
The annular cover body has a cylindrical peripheral wall, and an annular wall extending radially inward from a vehicle inner side end of the peripheral wall,
The holding portion of the annular cover body is formed in the head portion by pressing from the vehicle inner side with a guide piece for guiding the sensor head portion pushed in along the pushing direction on the vehicle outer side in the axial direction. And holding the head portion so as to be sandwiched from the axial direction,
The projecting piece is bent from the inner peripheral edge of the annular wall, and is bent radially outward from the upper end of the projecting base, and the engagement portion of the head unit is pressed and engaged in the middle portion. A resiliently acting part formed with a pressing part to be
On both sides of the head portion in the pushing direction, bulge portions bulging outward are formed,
The elastic pieces have receiving portions for positioning the head portion in the radial direction on both sides of the pressing direction by receiving the front end surface of the protruding portion in the pressing direction in the vicinity of the engaging position with the engaging portion. Each projecting ,
In the impact acting portion, the receiving position of the distal end surface of the bulging portion by the receiving portion corresponds to the receiving portion being formed closer to the resilient base portion than the pressing portion. Is located on the front side in the pushing direction with respect to the engagement position with the engagement portion,
The head portion is received in the receiving portion and positioned in the radial direction, and is pressed in the axial direction by the pressing action of the bullet piece and pressed and held forward in the pushing direction,
In the state in which the head portion is positioned, the tip surface of the head portion is not in contact with the inner surface of the bullet base of the bullet piece, so that the tip surface of the bullet piece is in contact with the bullet base of the bullet piece. A rotation detection sensor mounting structure, wherein the rotation detection sensor mounting structure is set so as to be separated from the inner surface . A head portion of a sensor for detecting a rotational change of a pulsar ring fixed to a vehicle inner side end portion in an axial direction of the inner ring, while being fixed to a vehicle body via an outer ring and rotatably supporting the wheel by an inner ring; A hub unit including a rotation detecting device that is pushed in from a radial direction and fixed to a holding portion provided in an annular cover body fixed to the outer ring so as to face a pulsar ring,
The annular cover body has a cylindrical peripheral wall, and an annular wall extending radially inward from a vehicle inner side end of the peripheral wall,
The holding portion of the annular cover body is formed in the head portion by pressing from the vehicle inner side with a guide piece for guiding the sensor head portion pushed in along the pushing direction on the vehicle outer side in the axial direction. And holding the head portion so as to be sandwiched from the axial direction,
The projecting piece is bent from the inner peripheral edge of the annular wall, and is bent radially outward from the upper end of the projecting base, and the engagement portion of the head unit is pressed and engaged in the middle portion. A resiliently acting part formed with a pressing part to be
On both sides of the head portion in the pushing direction, bulge portions bulging outward are formed,
The elastic pieces have receiving portions for positioning the head portion in the radial direction on both sides of the pressing direction by receiving the front end surface of the protruding portion in the pressing direction in the vicinity of the engaging position with the engaging portion. Each projecting ,
In the impact acting portion, the receiving position of the distal end surface of the bulging portion by the receiving portion corresponds to the receiving portion being formed closer to the resilient base portion than the pressing portion. Is located on the front side in the pushing direction with respect to the engagement position with the engagement portion,
The head portion is received in the receiving portion and positioned in the radial direction, and is pressed in the axial direction by the pressing action of the bullet piece and pressed and held forward in the pushing direction,
In the state in which the head portion is positioned, the tip surface of the head portion is not in contact with the inner surface of the bullet base of the bullet piece, so that the tip surface of the bullet piece is in contact with the bullet base of the bullet piece. A hub unit comprising a rotation detection device set to be separated from an inner surface .

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