JP5251922B2 - Drive wheel hub unit - Google Patents

Description

  The present invention relates to a drive wheel hub unit that is applied to a wheel support structure that includes, for example, a sensor of an ABS rotation detection device and is equipped with a magnetic encoder facing the sensor.

  In the drive wheel hub unit, the hub unit rotatably supports the hub and the inner ring via a plurality of rolling elements on the inner diameter side of the outer ring of the bearing.

  The outer ring is fixed to a knuckle constituting the suspension device by a support flange provided on the outer peripheral surface thereof. A double row outer ring raceway is provided on the inner peripheral surface of the outer ring, and a hub and an inner ring are supported on the inner diameter side of the outer ring.

  The hub is provided with an attachment flange for attaching a wheel to the outer end thereof. A first inner ring raceway is formed at an intermediate portion of the outer peripheral surface of the hub, and an inner ring is fitted and fixed to a small diameter step portion at the inner end of the hub. A second inner ring raceway is formed on the inner ring. For example, in a hub unit for a drive wheel, a female spline for fitting and fixing a constant velocity joint by spline fitting is provided at the center of the hub.

  There is also a hub unit with a sensor that detects the rotational speed of the wheel in order to support the wheel rotatably with respect to the suspension system and to control the anti-lock brake system (ABS) and the traction control system (TCS). .

  When this hub unit is used, a magnetic encoder that is fixed to the inner ring and alternately magnetized with a plurality of N and S poles in the circumferential direction as the wheel rotates is rotated, and the sensor disposed opposite the magnetic encoder is , Its output changes. Since the frequency of this output change is proportional to the rotational speed of the wheel, the output signal of the sensor is input to the control device through the harness, the rotational speed of the wheel is obtained, and the ABS and TCS are appropriately controlled.

In addition, there exist the following patent documents 1 thru | or 3 as a related conventional gazette.
JP 2000-221202 A JP 2000-221203 A JP 2000-221204 A

In the hub unit of the type described above , water may accumulate between the sensor holder of the rotational speed detection sensor and the bearing, which may impair sealing performance.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a drive wheel hub unit in which the sealing performance is not hindered .

In order to achieve the above object, a hub unit for a drive wheel according to claim 1 of the present invention is an outer ring in which one of the stationary ring and the rotating ring has a double row outer ring raceway on the inner peripheral surface. And
The other race ring of the stationary ring and the rotary ring is an inner ring assembly that combines a shaft member and a separate inner ring, and has a double row inner ring raceway on the outer peripheral surface,
In the shaft member, one inner ring raceway is formed in an intermediate portion in the axial direction, and a small diameter step portion having a smaller diameter than the inner ring raceway portion is formed in an axial end portion thereof,
The separate inner ring has the other inner ring raceway on the outer peripheral surface thereof, and in the drive wheel hub unit externally fitted to the small diameter step portion,
An encoder fixed to the rotating wheel and rotating, and a sensor facing the encoder and fixed to the stationary wheel via a sensor holder;
The sensor holder is made of a sheet metal and has an annular shape, and has a holding portion having a substantially U-shaped cross section cut in a radial direction, and a drain hole is provided in a lower portion,
The holding part is holding the sensor so as to surround from the inside in the vehicle width direction,
Sensor harness or connector comes out of the sensor,
The sensor unit includes the sensor and the harness or connector,
The sensor is an active sensor.

According to the present invention , since the drain hole is provided in the lower part of the sensor holder, water does not collect between the sensor holder and the bearing, and the sealing performance can be maintained well.

It is a longitudinal sectional view of a hub unit for a driving wheel according to the embodiment. FIG. 2 is a cross-sectional view of a main part of the drive wheel hub unit shown in FIG. 1 according to the first embodiment. FIG. 3 is a side view of the rotation speed detection sensor shown in FIG. 2. (A) and (b) are typical sectional views of the hub unit for drive wheels concerning the modification of a 1st embodiment, respectively. It is a schematic diagram which shows the internal structure of the sensor for rotational speed detection concerning 2nd Embodiment. It is a schematic diagram which shows the internal structure of the sensor for rotational speed detection according to the modification of 2nd Embodiment. It is sectional drawing of the principal part of the hub unit for drive wheels which concerns on 3rd Embodiment. It is a perspective view of the knuckle shown in FIG. (A) is sectional drawing of the principal part of the hub unit for drive wheels which concerns on 4th Embodiment, (b) (c) is a side view of the sensor for rotational speed detection, and a sensor holder, respectively. (A) is sectional drawing of the principal part of the hub unit for drive wheels which concerns on 5th Embodiment, (b) (c) is a side view of the sensor for rotational speed detection, and a sensor holder, respectively. It is sectional drawing of the principal part of the hub unit for drive wheels which concerns on the modification of 5th Embodiment. It is sectional drawing of the principal part of the hub unit for drive wheels which concerns on 6th Embodiment of this invention. It is a side view of a rotation speed detection sensor and a sensor holder. It is sectional drawing of the principal part of the hub unit for drive wheels which concerns on the prior art example 1 of 7th Embodiment, and the side view of the sensor for rotational speed detection. It is sectional drawing of the principal part of the hub unit for drive wheels which concerns on the prior art example 2 of 7th Embodiment, and the side view of the sensor for rotational speed detection. It is sectional drawing of the principal part of the hub unit for drive wheels which concerns on 7th Embodiment, and the side view of the sensor for rotational speed detection. (A) is a perspective view of a rotational speed detection sensor and a sensor holder of a hub unit for driving wheels according to an eighth embodiment. (B) is a perspective view of the modification of the rotational speed detection sensor of the hub unit for drive wheels which concerns on 8th Embodiment. (C) is a perspective view of the modification of the sensor holder of the hub unit for drive wheels which concerns on 8th Embodiment. It is a perspective view of the rotational speed detection sensor and sensor holder of the hub unit for drive wheels which concerns on the modification of 8th Embodiment .

Hereinafter , a drive wheel hub unit according to an embodiment will be described with reference to the drawings. Of the examples and related descriptions described below with reference to FIGS. 1 to 18, the examples and related descriptions described with reference to FIGS. 12 and 13 relate to the drive wheel hub unit according to the embodiment of the present invention. The other descriptions are reference examples.

(Overall configuration of drive wheel hub unit)
Figure 1 is a longitudinal sectional view of a hub unit for a driving wheel according to the embodiment.

  In the drive wheel hub unit, the drive wheel hub 2 and the inner ring 3 are rotatably supported on the inner diameter side of the outer ring 1 via a plurality of rolling elements 4.

  The outer ring 1 is coupled and fixed to a knuckle N that constitutes a suspension device by a bolt B via a support flange F provided on the outer peripheral surface thereof, and a part of the outer ring 1 is attached to a knuckle hub unit as shown in FIG. It is inserted in the service hole NH.

  Double-row outer ring raceways 5 a and 5 b are provided on the inner peripheral surface of the outer ring 1, and the driving wheel hub 2 and the inner ring 3 are supported on the inner diameter side of the outer ring 1.

  The drive wheel hub 2 is provided with a mounting flange M for mounting the wheel W and the brake disc D of the wheel on the outer periphery of the outer end portion located outside the vehicle body (left side in FIG. 1) when mounted.

  A first inner ring raceway 7a is formed at an intermediate portion of the outer peripheral surface of the drive wheel hub 2, and an inner ring 3 is fitted and fixed to a cylindrical small-diameter step portion 6 also formed at the inner end. The second inner ring raceway 7b is formed.

  A female spline 8 is formed on the radially inner peripheral surface of the drive wheel hub 2, and a male spline shaft 9 a of a constant velocity joint 9 is spline-fitted to the female spline 8 and fixed thereto. ing.

  A seal member S is interposed between the outer peripheral surface of the hub 2 and the outer end portion of the outer ring 1.

(First embodiment)
FIG. 2 is a cross-sectional view of the main part of the drive wheel hub unit shown in FIG. 1 according to the first embodiment. FIG. 3 is a side view of the rotation speed detection sensor shown in FIG.

  In the present embodiment, a magnetic encoder 10 is provided on the inner side of the inner ring 3 in the vehicle width direction (the right side in FIG. 2). The magnetic encoder 10 is formed in a disk shape, and a plurality of N / S poles are alternately magnetized in the circumferential direction.

  The material of the encoder may be a material such as rubber or resin.

  The magnetic encoder 10 is attached to a cylindrical member 11 fixed to the inner end 3 a in the vehicle width direction of the inner ring 3 via a seal member 12.

The seal member 12 has a substantially L-shaped tubular cored bar member 13 fixed to the cylindrical member 11 on the inner ring 3 side, and a cross section fixed to the inner peripheral surface of the inner end 1a in the vehicle width direction of the outer ring 1. It has a substantially L-shaped and cylindrical cored bar member 14 and a lip member 15 that adheres to the cored bar member 14 and forms a sealing action with the cored bar member 13.

  In addition, these metal cores are made of a low carbon steel plate such as SPCC, and the surface thereof is coated with a rust preventive coating, or is made of a stainless steel plate such as SUS430, and the thickness is 0.1 mm to 1.5 mm. Degree.

  A rotation speed detection sensor 30 that is an active sensor for detecting the rotation speed of the drive wheel is provided so as to face the magnetic encoder 10.

  This rotational speed detection sensor 30 is generally attached to the outer ring 1 via the sensor holder 20 and is located on the radially inner side of the hub unit attachment hole NH of the knuckle N. They are arranged so as not to interfere with the constant velocity joint 9.

  The rotational speed detection sensor 30 is fixed to the outer ring 1 and is located on the radially inner side of the hub unit mounting hole NH of the knuckle N, but does not contact the knuckle N and No special attachment processing or interference prevention processing is performed.

  The sensor holder 20 includes a cored bar member 21 that is press-fitted into the outer peripheral surface of the inner end 1 a in the vehicle width direction of the outer ring 1, and a resin part 22 that is formed integrally with the cored bar member 21.

  As shown in FIG. 3, the rotational speed detection sensor 30 has a sensor body 31 formed in an annular shape, and the sensor body 31 has a relatively large volume for housing each component of the sensor. There is no problem even if there are many.

As shown in FIG. 3, the sensor body 31 by screws 23 of a plurality (three in the illustrated example), screwed to the resin portion 22 of the sensor holder 20, that maintains engages. The engagement means of the sensor body 31 to the sensor holder 20 side may be any type, for example, a clip type, or a press-fitting type as in an embodiment described later. Resin integral mold fixing may be used.

  Further, the sensor body 31 is provided with a concave hole 32 for accommodating the head of the screw 13 so that the head of the screw 23 does not interfere with the constant velocity joint 9.

  As shown in FIG. 3, the sensor body 31 has a notch 33 formed therein, and the lead 34 a of the harness 34 (cord or connector) is taken out from the notch 33 and extended. .

  In addition, although the harness 34 (drawer cord) may be pulled out from the sensor main body 31, it may replace with this and may comprise so that the connector which is not shown in figure may be pulled out.

  The lead-out portion 34a of the harness 34 (cord or connector) has a deformability that allows deformation of the shape when a predetermined load or more is applied from the outside, and the weight (harness 34 (cord Alternatively, it may be formed of a material such as resin or vinyl having shape retaining properties that always maintain and maintain the shape as it is.

  When the load is not more than a predetermined value, the lead-out portion 34a of the harness 34 (cord or connector) is larger than the outer diameter of the constant velocity joint 9 at least until it comes out of the hub unit mounting hole NH of the knuckle N (same It is held in its shape so that it is located on the outer diameter side (in the axial position).

  Accordingly, the lead-out portion 34a of the harness 34 (cord or connector) is located on the radially inner side of the hub unit attachment hole NH of the knuckle N and is disposed so as not to interfere with the constant velocity joint 9.

  As shown in FIG. 2, through holes 24 and 25 are formed in the metal core member 21 and the resin portion 22 of the sensor holder 20, and sensing extending from the sensor body 31 is formed in the through holes 24 and 25. Part 35 is inserted.

  This sensing unit 35 is configured to be exposed from the metal core member 21 outward in the vehicle width direction (left side in FIG. 2) and to face the magnetic encoder 10. As a result, when the hub unit is used, the magnetic encoder 10 fixed to the inner ring 3 rotates with the rotation of the drive wheel, and the output of the sensor 30 disposed facing the magnetic encoder 10 changes. Since the frequency of this output change is proportional to the rotational speed of the drive wheel, the output signal of the sensor 30 is input to a control device (not shown), the rotational speed of the drive wheel is obtained, and the ABS and TCS are appropriately controlled. Can do.

  A plurality of sensing units 35 may be provided, or a plurality of Hall ICs may be attached to one sensing unit. Reference numeral 26 denotes a sealing lip that is fixed to the cylindrical member 11 and seals the space between the sensor holder 20 and the core metal member 21 to protect the sensing unit 35 and the like. This part may be a labyrinth seal. In the case of this labyrinth seal, there is a possibility that rainwater or the like may enter the vicinity of the sensing unit 35. Therefore, preferably, in the lower part of the core metal member 21 of the sensor holder 20 as in the embodiment described later. A drain hole is provided to discharge rainwater. Further, reference numeral 36 denotes a waterproof O-ring that seals between the resin portion 22 and the sensor main body 31 so that water does not enter the sensing portion 35.

  As described above, according to the present embodiment, the rotational speed detection sensor 30 is attached to the outer ring 1 via the sensor holder 20 and is located on the radially inner side of the hub unit attachment hole NH of the knuckle N. And arranged so as not to interfere with the constant velocity joint 9. When the load is less than or equal to a predetermined value, the lead-out portion 34a of the harness 34 (cord or connector) is on the outer diameter side from the outer diameter of the constant velocity joint 9 at least until it goes out of the attachment hole NH of the knuckle N. It is held in its shape to be positioned. Even if the rotational speed detection sensor 30 is located on the radially inner side of the hub unit mounting hole NH of the knuckle N, not only in the case of FIG. 2, but also in the axial direction, the hub unit mounting hole NH and the sensor. 30 may be partly or entirely offset.

  Further, according to the present embodiment, the rotation speed detection sensor 30 is an active sensor, and the sensing unit 35 directly faces the magnetic encoder 10 without providing any interposition between the sensor 35 and the magnetic encoder 10. Since the harness 34 (cord or connector) of the rotational speed detection sensor 30 is taken out from the gap between the knuckle N and the constant velocity joint 9, it is not necessary to make a hole in the knuckle N as in the prior art. As a result, the strength of the knuckle N is increased as compared with the conventional product. As a result, the knuckle N can be reduced in weight and space, and the bearing can be easily assembled.

(Modification of the first embodiment)
4A and 4B are schematic cross-sectional views of a drive wheel hub unit according to a modification of the first embodiment of the present invention.

  Preferably, the gap between the sensor body 31 (cap) of the rotational speed detection sensor 30 and at least the end surface of the inner ring 3, the outer diameter thereof, and the rotating member formed of the constant velocity joint 9 is 0.1 mm or more, The gap is set to be equal to or smaller than the gap between the constant velocity joint 9 and the knuckle N.

  That is, as shown in FIGS. 4A and 4B, the clearances (1) and (2) between the rotation speed detection sensor 30 and the rotation member are 0.1 mm or more, and the constant velocity joint 9 and the knuckle N is set to be equal to or less than the gap with N. As a result, a labyrinth structure is provided between the rotational speed detection sensor 30 and the rotating member.

  The basis of the above-mentioned “0.1 mm” is the minimum clearance when considering the interference between the constant velocity joint 9 and the rotating member due to the displacement due to the plane runout and the elastic deformation of the bearing.

(Second Embodiment)
FIG. 5 is a schematic diagram illustrating an internal structure of a rotation speed detection sensor according to the second embodiment.

  In the present embodiment, the electronic components a, b, c... Of the sensor housed in the circumferential sensor body 31 (cap) are arranged along the circumferential shape of the cap. These electronic components a, b, c... Are connected to a harness 34 (cord or connector).

  As described above, according to the present embodiment, the internal circuit of the rotational speed detection sensor 30 is circumferentially arranged in the sensor body 31 (cap), so that the knuckle N can be reduced in size and weight. , Can contribute to strength up. In addition, the dead space on the circumference can be used effectively, which can contribute to the miniaturization of the sensor built-in hub unit.

(Modification of the second embodiment)
FIG. 6 is a schematic diagram illustrating an internal structure of a rotation speed detection sensor according to a modification of the second embodiment.

  In the present embodiment, the sensor main body 31 (cap) has an arc shape, and each electronic component a, b, c... Of the sensor housed in the arc-shaped sensor main body 31 (cap) is an arc shape of the cap. It is arranged along. These electronic components a, b, c... Are connected to a harness 34 (cord or connector).

  Thus, according to the present embodiment, since the internal circuit of the rotation speed detection sensor 30 is arranged in an arc shape in the sensor body 31 (cap), the knuckle N can be reduced in size and weight, It can contribute to strength improvement. In addition, the dead space on the circumference can be used effectively, which can contribute to the miniaturization of the sensor built-in hub unit.

(Third embodiment)
FIG. 7 is a cross-sectional view of a main part of the drive wheel hub unit according to the third embodiment. FIG. 8 is a perspective view of the knuckle shown in FIG.

  This embodiment has the same basic structure as the first embodiment described above, and only differences will be described.

  The sensor holder 20 includes only a cored bar member 21, and the cored bar member 21 is configured to surround the sensor main body 31 of the rotation speed detection sensor 30 from the inside in the vehicle width direction.

  An axial groove 40 extending in the axial direction is formed in the hub unit mounting hole NH of the knuckle N.

  The rotational speed detection sensor 30 has a sub body 31a in addition to the sensor body 31 and the sensing unit 35. The sub body 31a is housed in the axial groove 40 of the knuckle N and is also supported by the cored bar member 21. It is.

  A harness 34 (cord or connector) is pulled out from the sub body 31a inward in the vehicle width direction, and extends in the axial direction groove 40 inward in the vehicle width direction.

  As described above, according to the present embodiment, the harness 34 (cord or connector) of the rotational speed detection sensor 30 is taken out through the axial groove 40 formed in the knuckle N. It can contribute to weight reduction and strength improvement.

(Fourth embodiment)
FIG. 9A is a cross-sectional view of the main part of the drive wheel hub unit according to the fourth embodiment, and FIGS. 9B and 9C are side views of the rotational speed detection sensor and the sensor holder, respectively. is there.

  This embodiment has the same basic structure as the first or third embodiment described above, and only differences will be described.

  The sensor holder 20 is composed only of a cored bar member 21 (cover), and the base end of the cored bar member 21 (cover) is fixed to the inner end 1 a in the vehicle width direction of the outer ring 1. A part 21a having a substantially U-shaped cross section is formed extending from the end, and the sensor body 31 of the rotational speed detecting sensor 30 is surrounded from the inside in the vehicle width direction by the part 21a having a substantially U-shaped cross section. It is configured as follows.

  That is, the sensor main body 31 is integrally molded and fixed to a portion 21a having a substantially U-shaped cross section of the cored bar member 21 (cover) by a resin mold.

  In this case, the sensor body 31 may be formed in a circumferential shape (donut shape) as shown in FIG. 9 (b), or alternatively, as shown in FIG. 9 (c). Further, it may be formed in an arc shape (fan shape).

  As related arts, in Patent Documents 1 to 3, the rotational speed detection sensor is fixed to the non-rotating side by being locked or screwed to the sensor holder. However, in this case, the rotational speed detection sensor and the sensor holder may have complicated shapes, and further, the fixing force between the rotational speed detection sensor and the sensor holder may not be sufficient.

  As described above, in the present embodiment, the sensor main body 31 is integrally formed by the resin mold on the substantially U-shaped section 21a of the cored bar member 21 (cover). The shapes of the sensor 30 and the sensor holder 20 can be simplified, and the fixing force between the rotation speed detection sensor 30 and the sensor holder 20 can be improved.

  In the present embodiment, the clearance between the sensor main body 31 (cap) of the rotational speed detection sensor 30 and at least the end surface of the inner ring 3, the outer diameter thereof, and the rotating member including the constant velocity joint 9 is 0.1 mm or more. However, it is set to be equal to or smaller than the gap between the constant velocity joint 9 and the knuckle N. That is, as shown in FIGS. 4A and 4B, the clearances (1) and (2) between the rotation speed detection sensor 30 and the rotation member are 0.1 mm or more, and the constant velocity joint 9 and the knuckle N is set to be equal to or less than the gap with N. As a result, a labyrinth structure is provided between the rotational speed detection sensor 30 and the rotating member. The basis of the above-mentioned “0.1 mm” is the minimum clearance when considering the interference between the constant velocity joint 9 and the rotating member due to the displacement due to the plane runout and the elastic deformation of the bearing.

(Fifth embodiment)
FIG. 10A is a cross-sectional view of a main part of a drive wheel hub unit according to the fifth embodiment, and FIGS. 10B and 10C are side views of a rotational speed detection sensor and a sensor holder, respectively. is there.

  This embodiment has the same basic structure as the first, third, or fourth embodiment described above, and only differences will be described.

  The sensor holder 20 is composed only of a cored bar member 21 (cover), and the base end of the cored bar member 21 (cover) is fixed to the inner end 1 a in the vehicle width direction of the outer ring 1. A portion 21b having a substantially L-shaped cross section is formed extending from the end, and the sensor body 31 of the rotational speed detection sensor 30 is surrounded from the inside in the vehicle width direction by the portion 21b having a substantially L-shaped cross section. It is configured as follows.

  That is, the sensor main body 31 is integrally fitted and fixed to the portion 21b having a substantially L-shaped section of the cored bar member 21 (cover) by press-fitting.

  In this case, the sensor body 31 may be formed in a circumferential shape (donut shape) as shown in FIG. 10 (b), or alternatively, as shown in FIG. 10 (c). Further, it may be formed in an arc shape (fan shape).

  As related arts, in Patent Documents 1 to 3, the rotational speed detection sensor is fixed to the non-rotating side by being locked or screwed to the sensor holder. However, in this case, the rotational speed detection sensor and the sensor holder may have complicated shapes, and further, the fixing force between the rotational speed detection sensor and the sensor holder may not be sufficient.

  As described above, in the present embodiment, the sensor body 31 is integrally fitted and fixed to the portion 21b having a substantially L-shaped section of the cored bar member 21 (cover) by press-fitting. The speed detection sensor 30 and the sensor holder 20 can be simplified in shape, and the contact area between the sensor main body 31 and the cored bar member 21 (cover) increases dramatically. The fixing force between the sensor 30 and the sensor holder 20 can be improved.

FIG. 11 is a cross-sectional view of a main part of a drive wheel hub unit according to a modification of the fifth embodiment.

  In this modification, the sensor holder 20 includes only a cored bar member 21 (cover), and the based end of the cored bar member 21 (cover) is fixed to the inner end 1 a in the vehicle width direction of the outer ring 1. In addition, a part 21a having a substantially U-shaped cross section is formed extending from the base end, and the sensor body 31 is integrally fitted to the part 21a having a substantially U-shaped cross section by press-fitting. Fixed.

  That is, the inner diameter side portion of the cored bar member 21 (cover) is bent, and the sensor main body 31 is integrally fitted and fixed to the bent substantially U-shaped portion 21a by press-fitting.

(Sixth embodiment)
FIG. 12 is a cross-sectional view of a main part of a drive wheel hub unit according to a sixth embodiment of the present invention.

  FIG. 13 is a side view of the rotational speed detection sensor and the sensor holder.

  This embodiment has the same basic structure as the first or third embodiment described above, and only differences will be described.

  As shown in FIG. 12, the sensor holder 20 is composed only of a core metal member 21 (cover), and the core metal member 21 (cover) has a base end fixed to the inner end 1 a in the vehicle width direction of the outer ring 1. In addition, a portion 21a having a substantially U-shaped cross section is formed extending from the base end, and the sensor body 31 of the rotation speed detecting sensor 30 is formed by the portion 21a having a substantially U-shaped cross section. It is configured to be enclosed from the inside in the vehicle width direction. Further, a labyrinth structure is formed between the inner diameter side of the cored bar member 21 (cover) and the inner end 3a in the vehicle width direction of the inner ring 3 as in the above (FIG. 4).

  By the way, conventionally, since the drain hole was not provided in the lower part of the cored bar member 21 (cover), water does not escape and collects between the cored bar member 21 (cover) and the bearing. In some cases, the sealing performance is impaired.

  In the present embodiment, as shown in FIG. 13, a drain hole 50 is provided in the lower portion of the cored bar member 21 (cover). Thereby, water does not accumulate between the cored bar member 21 (cover) and the bearing, and the sealing performance can be maintained well.

(Seventh embodiment)
FIG. 14 is a cross-sectional view of a main part of a drive wheel hub unit according to Conventional Example 1 of a seventh embodiment, and a side view of a rotational speed detection sensor.

FIG. 15 is a cross-sectional view of a main part of a drive wheel hub unit according to Conventional Example 2 of the seventh embodiment and a side view of a rotational speed detection sensor.

FIG. 16 is a cross-sectional view of the main part of the drive wheel hub unit according to the seventh embodiment and a side view of the rotational speed detection sensor.

  This embodiment has the same basic structure as the first or third embodiment described above, and only differences will be described.

  In Conventional Example 1 of FIG. 14, the sensor body 31 of the rotational speed detection sensor 30 is provided with an IC 60, and an IC terminal 61 extends from the IC 60 and is connected to the harness 34 in the sub body 31a. It is.

  Thus, in the conventional example 1 of FIG. 14, since the IC terminal 61 extends in a straight line (straight), a general IC distributed in the market can be used as it is, and the cost is reduced. There are things such as excellent performance. However, since the IC terminal 61 extends in a straight line (straight), there is a problem that the radial direction length of the entire rotation speed detecting sensor 30 becomes long.

  In the conventional example 2 of FIG. 15, the IC terminal 61 is routed in the circumferential direction in the ring-shaped sensor body 31, thereby attempting to shorten the radial length of the entire rotation speed detection sensor 30. Yes. However, in the conventional example 2 of FIG. 15, the manufacturing cost may increase.

  For this reason, in the present embodiment shown in FIG. 16, the IC terminal 61 is refracted, for example, by approximately 90 degrees. As a result, the overall length of the rotational speed detection sensor 30 in the radial direction can be shortened to be compact, and at the same time, the manufacturing cost can be reduced.

(Eighth embodiment)
FIG. 17A is a perspective view of the rotational speed detection sensor and the sensor holder of the drive wheel hub unit according to the eighth embodiment.

  This embodiment has the same basic structure as the first or third embodiment described above, and only differences will be described.

  As related arts, in Patent Documents 1 to 3, the rotational speed detection sensor is fixed to the non-rotating side by being locked or screwed to the sensor holder. However, in this case, the rotational speed detection sensor and the sensor holder may be complicated in shape, and furthermore, only the elastic force of the sensor holder is used as the holding force. There are cases where the fixing force of the holder is not always sufficient.

  In the present embodiment of FIG. 17A, the rotational speed detection sensor 30 is formed with a substantially arc-shaped convex portion 71 and the sensor holder 20 is formed with a substantially arc-shaped concave portion 72. It is. A flanged recess 72a for fixing the ratchet is formed adjacent to the recess 72.

  Therefore, when the convex portion 71 of the rotational speed detection sensor 30 is fitted into the concave portion 72 of the sensor holder 20 and the rotational speed detection sensor 30 and the sensor holder 20 are rotated relative to each other, the convex portion 71 becomes the ratchet. Thus, the substantially arcuate convex portion 71 and the flanged concave portion 72a can be fixed by ratcheting with each other.

As described above, in the present embodiment, the substantially arc-shaped convex portion 71 and the flanged concave portion 72a can be fixed by ratchet fitting with each other, so that the sensor holder 20 has a simplified shape. can be of further, since it is not a Ruwake have an elastic force as the main holding force can deterioration of holding power without improving the fixing force of the rotational speed sensor 30 for detecting the sensor holder 20 .

FIG. 17B is a perspective view of a modified example of the rotational speed detection sensor of the hub unit for driving wheels according to the eighth embodiment.

  In the present modification, the rotational speed detection sensor 30 is formed with two substantially arc-shaped convex portions 71. Thereby, the fixing force of the rotation speed detection sensor 30 and the sensor holder 20 can be further improved.

FIG. 17C is a perspective view of a modified example of the sensor holder of the drive wheel hub unit according to the eighth embodiment.

  In the present modification, the sensor holder 20 is formed with a sensing hole 73 for inserting the sensing portion 35 of the rotational speed detection sensor 30. In addition, you may comprise so that it may detect through a nonmagnetic material, without providing such a hole 73 for sensing.

FIG. 18 is a perspective view of a rotational speed detection sensor and a sensor holder of a drive wheel hub unit according to a modification of the eighth embodiment .

  In the present modification, the rotation speed detection sensor 30 includes a flange 30 a around the outer periphery thereof, and the flange 30 a is fitted inside the cylindrical sensor holder 20.

  The flange 30a is formed with a substantially arc-shaped convex portion 71, and the sensor holder 20 is formed with a substantially arc-shaped concave portion 72. A flanged recess 72a for fixing the ratchet is formed adjacent to the recess 72.

  Accordingly, when the convex portion 71 of the flange 30a is fitted into the concave portion 72 of the sensor holder 20 and the flange 30a and the sensor holder 20 are relatively rotated, the convex portion 71 is formed into the hooked concave portion 72a like a ratchet. The substantially arc-shaped convex portion 71 and the flanged concave portion 72a can be fixed by ratcheting with each other.

As described above, in the present embodiment, the substantially arc-shaped convex portion 71 and the flanged concave portion 72a can be fixed by ratchet fitting with each other, so that the sensor holder 20 has a simplified shape. can be of further, since it is not a Ruwake have an elastic force as the main holding force can deterioration of holding power without improving the fixing force of the rotational speed sensor 30 for detecting the sensor holder 20 .

  Further, as shown in FIGS. 17 and 18, the shape of the rotation speed detection sensor 30 or the sensor holder 20 excluding the ratchet fitting portion may be a fan shape as shown in FIG. 17, as shown in FIG. A cylindrical shape may be sufficient and another shape may be sufficient.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

DESCRIPTION OF SYMBOLS 1 Outer ring 1a Vehicle width direction inner end 2 Drive wheel hub 3 Inner ring 3a Vehicle width direction inner end 4 Rolling element 5a, 5b Outer ring raceway 6 Small diameter step 7a, 7b Inner raceway 8 Female spline 9 Constant velocity joint 9a Male spline shaft 10 Magnetic encoder 11 Tubular member 12 Seal member 13 Core metal member 14 Core metal member 15 Lip member 20 Sensor holder 21 Core metal member 21a Section having a substantially U-shaped section 21b Section having a substantially L-shaped section 22 Resin section 23 Screw 24, 25 Through-hole 26 Seal member 30 Sensor for detecting rotation speed 30a Flange 31 Sensor body 31a Sub-body 32 Recessed hole 33 Notch portion 34 Harness (cord or connector)
34a Lead-out part 35 Sensing part 36 O-ring 40 Axial hole 50 Water drain hole 60 IC
61 IC terminal 71 Convex 72 Concave 72a Concave concavity 73 Sensing hole N Knuckle NH Hub unit mounting hole F Support flange B Bolt D Brake disk W Wheel M Mounting flange a, b, c Electronic parts

Claims (1)

One of the stationary ring and the rotating ring is an outer ring having a double row outer ring raceway on the inner peripheral surface,
The other race ring of the stationary ring and the rotary ring is an inner ring assembly that combines a shaft member and a separate inner ring, and has a double row inner ring raceway on the outer peripheral surface,
In the shaft member, one inner ring raceway is formed in an intermediate portion in the axial direction, and a small diameter step portion having a smaller diameter than the inner ring raceway portion is formed in an axial end portion thereof,
The separate inner ring has the other inner ring raceway on the outer peripheral surface thereof, and in the drive wheel hub unit externally fitted to the small diameter step portion,
An encoder fixed to the rotating wheel and rotating, and a sensor facing the encoder and fixed to the stationary wheel via a sensor holder;
The sensor holder is made of a sheet metal and has an annular shape, and has a holding portion having a substantially U-shaped cross section cut in a radial direction, and a drain hole is provided in a lower portion,
The holding part is holding the sensor so as to surround from the inside in the vehicle width direction,
Sensor harness or connector comes out of the sensor,
The sensor unit includes the sensor and the harness or connector,
The drive wheel hub unit, wherein the sensor is an active sensor.

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