JPH08230630A - Installing structure of wheel speed sensor - Google Patents

Abstract

PURPOSE: To provide an installing structure of a wheel speed sensor which can prevent falling-off of a sealing member to prevent leakage of lubricating oil without increasing the number of part items and by which the wheel speed sensor can be reliably fixed. CONSTITUTION: A wheel speed sensor 9 opposed to a rotor 8 being a detecting object member whose tip rotates together with a wheel is internally arranged in an installing hole 7 arranged in the center of a cylindrical bracket 3 screw- fitted to a housing 6 being a nonrotating member. A spacer 1 where a cylindrical spacer part 10 to elastically fix the wheel speed sensor 9 and a sealing part 2 to prevent leakage of lubricating oil are integrally formed by a rubber material, is arranged between the installing hole 7 and the wheel speed sensor 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a wheel speed sensor which is used in an anti-skid brake device for preventing wheel lock and which detects wheel speed.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 3-25371 discloses a wheel speed sensor which is inserted into a mounting hole formed in a non-rotating portion of a vehicle and whose tip faces a member to be detected which rotates together with a wheel. A cylindrical spacer for elastically engaging both of the outer circumference of the wheel speed sensor and the inner circumference of the mounting hole to fix the wheel speed sensor to the mounting hole. A mounting structure for the arranged wheel speed sensor is disclosed.

In Japanese Utility Model Application Laid-Open No. 3-2263, a mounting hole and a wheel are provided in order to prevent lubricating oil scattered from an axle shaft to which a member to be detected is mounted from leaking to the outside through the mounting hole. A wheel speed sensor mounting structure is disclosed in which a seal member for sealing the speed sensor is provided.

FIG. 9 shows a mounting structure of a wheel speed sensor which also uses the above mounting structure. As shown in the drawing, a screw hole 26a is formed in the housing 26 that covers the rotor 28, the axle shaft, and the like, which are the detected members, and the outer periphery of the bracket 23 is screwed into the screw hole 26a. Further, on the outer periphery of the bracket 23, a seal washer 25 and a nut 24 are screwed to the outside of the housing 26, and a mounting hole 27 having a groove 27a in the center of the bracket 23 is formed.
Is provided. Further, in FIG. 9, a seal member 22 made of a rubber material and a spacer 21 made of a tubular metal material are provided in order to prevent the leakage of the lubricating oil. The spacer 21 has an inner hole 21a, and the outer shape thereof has a shape in which the central portion of the cylindrical portion is inwardly recessed, that is, an hourglass shape, and when the wheel speed sensor 29 is inserted into the inner hole 21a, The hollow central portion is radially outwardly expanded to elastically fix the wheel speed sensor 29. When the wheel speed sensor 29 is fixed in this way, there are the following problems in addition to the increase in the number of parts.

As described above, since the wheel speed sensor 29 is elastically fixed by using the spacer 21, the mounting hole 27 is provided.
Since the spacer 21 is inserted between the wheel speed sensor 29 and the wheel speed sensor 29, the inner circumference of the mounting hole 27 must be larger than the outer circumference of the wheel speed sensor 29 by the thickness of the spacer 21. 2 between the wheel and the wheel speed sensor 29
A large gap A is formed in the portion where 1 is not inserted, although it is shown below the spacer 21 in the figure. This gap A is exactly the groove 27a of the bracket 23.
Is generated between the seal member 22 and the wheel speed sensor 29, which are arranged at the wheel speed sensor 29,
It is possible that the sealing member 22 will fall off when it is inserted into the.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems, and prevents the sealing member from falling off from preventing the leakage of lubricating oil from the axle shaft to the outside without increasing the number of parts. It is another object of the present invention to provide a wheel speed sensor mounting structure that reliably fixes the wheel speed sensor by using a spacer that elastically engages.

[0007]

The above object is to provide a mounting structure of a wheel speed sensor which is inserted into a mounting hole formed in a non-rotating portion of a vehicle and has its tip facing a detected member rotating with a wheel. A wheel speed having a cylindrical spacer arranged between the outer circumference of the wheel speed sensor and the inner circumference of the mounting hole to elastically engage both of them to fix the wheel speed sensor to the mounting hole. In the sensor mounting structure, a mounting structure for the wheel speed sensor, wherein a seal portion for sealing between the wheel speed sensor and the mounting hole is integrally formed on the spacer.
Achieved by

[0008]

[Function] By elastically engaging the wheel speed sensor and the mounting hole,
By providing the cylindrical spacer portion for fixing the wheel speed sensor, the wheel speed sensor can be reliably fixed.
Further, since the seal portion is provided between the wheel speed sensor and the mounting hole, it is possible to prevent the lubricating oil scattered from the axle shaft from leaking to the outside. Further, since the spacer and the seal portion are integrated, the number of parts does not increase, and the seal portion does not drop off when the wheel speed sensor is inserted into the mounting hole.

[0009]

1 shows a mounting structure of a wheel speed sensor according to a first embodiment of the present invention.

In this drawing, similarly to the conventional example, a screw hole 6a is formed in a housing 6 which is a non-rotating member, and a cylindrical bracket 3 is screwed into this screw hole 6a. The bracket 3 has a flange portion 3a at the upper portion in the drawing, and a screw is provided on the outer periphery from below the flange portion 3a to the lower surface of the bracket 3. The lower part from the center of the outer periphery of the bracket 3 is screwed into the housing 6 as described above,
A seal washer 5 and a nut 4 are screwed on the outer periphery of the bracket 3 between the housing 6 and the collar portion 3a. Therefore, the bracket 3 is firmly fixed to the housing 6 by the nut 4 and the screw hole 6a of the housing 6.

Further, inside the bracket 3, a mounting hole 7 having a groove 7a into which a seal member is inserted is provided so as to penetrate therethrough in the vertical direction. In the mounting hole 7, a wheel speed sensor 9 is provided. Has been inserted. The wheel speed sensor 9 has a known structure, and is composed of a magnet, a pole piece, a coil, and the like, and a tip end portion 9a thereof faces the rotor 8 that is a member to be detected. Although the rotor 8 and the wheel speed sensor 9 are shown in contact with each other in FIG. 1, the rotor 8 and the wheel speed sensor 9 do not actually contact each other, and a gap of about one sheet of paper is provided. The rotor 8 is provided with slits 8a on the outer peripheral surface facing the wheel speed sensor 9 at equal intervals, and the size of the space at the tip of the wheel speed sensor 9 changes. Since they are connected through the gap, the size of the gap changes periodically according to the speed of the wheels. The speed of this change allows the speed of the wheels to be measured.

According to the first embodiment, a thin cylindrical spacer 10 made of a rubber material is mounted between the wheel speed sensor 9 and the mounting hole 7. The spacer 10 includes a spacer portion 1 including a tubular portion 1b having an annular collar portion 1a on an upper portion thereof.
And a seal portion 2 having a substantially circular cross section at the bottom, and the flange portion 1a is located on the upper surface of the bracket 3 and the seal portion 2 is located in the groove 7a of the bracket 3 when the mounting is completed.

2 and 3 are views showing only the spacer 10, FIG. 2 is a partial sectional plan view, and FIG. 3 is a sectional front view. The spacer 10 includes the spacer portion 1 described above.
An annular bulge 10a is provided on the inner circumference of the cylindrical portion 1b. This bulge 10a is for elastically engaging the wheel speed sensor 9 inserted into the spacer 10, but in this embodiment, since the spacer 10 is made of a rubber material, the tubular portion 1b is The elastic force is stronger than that of metal, and it is not necessary to indent the tubular portion 1b as a whole as in the conventional example, and the wheel speed sensor can be firmly fixed only by providing a bulge inside.

The mounting structure of the wheel speed sensor according to the first embodiment of the present invention is constructed as described above. Next, this mounting method will be described.

First, the spacer 10 is compressed and inserted into the bracket 3, and when the seal portion 2 comes to the position of the groove 7a, the force that compresses the spacer 10 is released,
The spacer 10 is fitted into the mounting hole 7 of the bracket 3.
In the prior art, at this time, the seal member was likely to come off, but in the present invention, the spacer portion 1 and the seal portion 2 are integrated, and further, the upper portion of the spacer 10 engages with the upper surface of the bracket 3 and the downward Since the seal portion 2 provided is provided inside the groove 7a of the bracket 3, the seal portion 2 cannot fall off. Next, the nut 4 is screwed onto the outer periphery of the bracket 3 and the seal washer 5 is loosely fitted,
It is screwed into the screw hole 6 a of the housing 6. Bracket 3
Once is screwed into place on the housing 6, the nut 4 is tightened to secure the bracket 3 to the housing 6. After that, the wheel speed sensor 9 is attached to the spacer 10
Push it in. At this time, the spacer 10 made of rubber material
Is elastically compressed outwardly and the wheel speed sensor 9 is inserted. However, when the wheel speed sensor 9 is inserted to a predetermined position, the compressed spacer 10 is loosened inward and the wheel speed sensor 9 is inserted. Elastically fixed.

Next, the operation of this embodiment will be described.

When the wheel rotates, the rotor 8 connected through the axle shaft rotates at the same speed as the wheel. When the rotor 8 rotates, the slits 8a provided at equal intervals on the outer periphery of the rotor 8 sequentially traverse the front end portions 9a of the wheel speed sensors 9 facing each other, and the wheel speed sensors 9
The size of the space where the tips of the two faces is periodically changed. When the size of this space changes, the magnetic flux around the wheel speed sensor 9 changes, which changes the induced voltage generated across the coil of the wheel speed sensor 9. The wheel speed sensor 9 detects the wheel speed by measuring the speed of change of the induced voltage.

The axle shaft connected to the wheels is
Of course, since it is supported by bearings, etc., lubricating oil is attached. Therefore, when the axle shaft rotates, the lubricating oil scatters due to the rotational force. Lubricating oil is scattered at the rotor 8 part where the axle shaft is connected, but the rotor 8 has a slit 8a.
Is provided, the particles are scattered toward the wheel speed sensor 9 side, and are further scattered toward the mounting hole 7 to which the wheel speed sensor 9 is fixed. However, in this embodiment, since the seal portion 2 is provided between the wheel speed sensor 9 and the blanket 3 at a position close to the rotor 8, the lubricating oil is scattered outside the housing 6, that is, the housing. No oil will leak to the outside of 6.

As described above, according to the first embodiment of the present invention, the spacer portion 1 and the seal portion 2 are integrally formed of the rubber material to form the spacer 10, so that the lubricating oil can be used without increasing the number of parts. It is possible to prevent the seal portion 2 that prevents leakage from falling off, and further to firmly fix the wheel speed sensor 9. Further, since the spacer 10 is integrally formed of a rubber material, it can be easily inserted into the mounting hole 7.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 4 shows a wheel speed sensor mounting structure according to a second embodiment of the present invention.

In this drawing, similarly to the first embodiment, a screw hole 16a is formed in a housing 16 which is a non-rotating member, and the screw hole 16a has a cylindrical bracket 13 having a flange portion 13a. And a seal washer 15 and a nut 14 are screwed on the outer periphery of the bracket between the housing 16 and the collar portion 13a.
The bracket 13 is firmly fixed in the housing 16 by the and the housing 16. Further, inside the bracket 13, the groove 1 into which the seal portion 12 is inserted downward is provided.
A mounting hole 17 having a hole 7a is provided, and a wheel speed sensor 19 is inserted into the mounting hole 17. The wheel speed sensor 19 has a well-known structure, and the tip end portion 19a thereof faces the rotor 18, which is a member to be detected. Also in FIG. 4, the rotor 18 and the wheel speed sensor 19 are shown to be in contact with each other, but like the first embodiment, they are not actually in contact with each other, and a gap of about one sheet is provided. ing. Rotor 1
8, slits 18a are provided at equal intervals on the outer peripheral surface facing the wheel speed sensor 19, and the size of the space facing the tip of the wheel speed sensor 19 is changed.
Since 8 is connected to the wheel via the axle shaft, the size of the gap changes according to the speed of the wheel.
Wheel speed can be measured.

Further, according to the second embodiment, the wheel speed sensor 1
A thin cylindrical spacer 20 made of an elastic metal material and a rubber material is attached between 9 and the attachment hole 17. Similar to the first embodiment, this spacer 20 is a member having a tubular spacer portion 11 and a seal portion 12 having a substantially circular cross-section at the bottom, but the spacer portion 11 is the first member.
Unlike the embodiment, it is made of a metal material such as spring steel,
A cylindrical portion 11b having an annular collar portion 11a on the outer periphery of the upper portion,
A flange portion 11c is provided on the outer periphery of the lower portion. Further, the seal portion 12 is made of a rubber material, which is annularly provided around the flange portion 11c by molding. When the mounting is completed, the collar portion 11a has the bracket 1
On the upper surface of 3, the seal portion 12 is provided with the groove 17a
Is located in.

5 and 6 are views showing only the spacer 20, FIG. 5 is a partial sectional plan view, and FIG. 6 is a sectional front view. The spacer portion 11 of the spacer 20 includes the tubular portion 1
A recess 20a is provided in the inner hole from the upper portion of 1b. The recess 20a is for elastically engaging the wheel speed sensor 19 inserted into the spacer 20, as in the conventional example. Further, in this embodiment, the cylindrical portion 11 of the spacer portion 11 is
The slit 20b is provided in b so that the spacer portion 11 made of a metal material with the seal portion provided around it can be easily inserted into the mounting hole 17.

The structure of the wheel speed sensor mounting structure according to the second embodiment has been described above. Next, the mounting method will be described.

First, the spacer 20 is compressed and inserted into the bracket 13. At this time, unlike the first embodiment, since the spacer portion 11 is made of metal and the flange portion 11c around which the seal portion 12 is provided is provided further below, it is difficult to insert the bracket 13 as it is. . However, in this embodiment, the cylindrical portion 11 of the spacer 20 is
Since the slit 20b is provided in b, it can be easily compressed. Spacer 20 that has been compressed is mounting hole 1
7, the seal portion 12 made of a rubber material is inserted into the groove 17a.
When the position is reached, the pressing force of the spacer 20 is relaxed and the spacer 20 is fitted into the mounting hole 17 of the bracket 13.

Similar to the first embodiment, in this embodiment, the spacer portion 11 and the seal portion 12 are integrated by molding, and the upper portion of the spacer 20 engages with the upper surface of the bracket 13 and is provided below. Since the sealed seal portion 12 is provided inside the groove 17a of the bracket 13, the seal portion 12 cannot fall off. Hereinafter, similarly to the first embodiment, after the nut 14 is screwed onto the outer periphery of the bracket 13, the housing 16 is inserted through the seal washer 15.
The bracket 13 is fixed to the housing 16, and then the wheel speed sensor 19 is attached to the spacer 2.
Push into 0. At this time, the recess 20 of the spacer portion 11
Although the wheel speed sensor 19 is inserted by elastically compressing a, the wheel speed sensor 19 is inserted by the elastic force of the spacer portion 11 when the wheel speed sensor 19 is inserted to a predetermined position.
Fix 9 firmly.

Although the mounting structure of the wheel speed sensor of the second embodiment is mounted as described above, the operation of the second embodiment is exactly the same as the operation of the first embodiment, and therefore its description will be given here. Omit it.

Further, according to the second embodiment, the wheel speed sensor 1
Instead of disposing the spacer and the seal member between the mounting hole 9 and the mounting hole 17, the spacer portion 11 made of an elastic metal material, for example, spring steel, and the seal portion 1 made of a rubber material.
By disposing the spacer 20 that is integrally formed with the wheel 2, the seal portion 12 that prevents leakage of lubricating oil is prevented from falling off without increasing the number of parts, and the wheel speed sensor 19 is firmly fixed. it can. Further, by providing the slit 20b in the tubular portion 11b of the spacer 20, it can be easily inserted into the mounting hole 17.

Although the respective embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications can be made based on the technical idea of the present invention.

For example, in the first embodiment, the slit is not provided in the cylindrical portion of the spacer, but it may be provided. In the second embodiment, the slit is provided in the cylindrical portion of the spacer in a substantially longitudinal direction. However, slits extending obliquely may be provided, and the number and size of the slits are not limited.

Further, in the second embodiment, the outer periphery of the cylindrical portion of the spacer is uniformly recessed, that is, in the shape of a drum, but as shown in FIGS. 7 and 8, a part of the outer periphery of the spacer is formed. It may be recessed so as to be elastically engaged with the wheel speed sensor.

That is, FIG. 7 shows a partial sectional plan view of the spacer 40 used in the mounting structure of the wheel speed sensor of the above modification, and FIG. 8 shows a sectional front view of the spacer 40. In this figure, the spacer 40 is the second
Similar to the embodiment, the spacer portion 41 is made of an elastic metal material such as spring steel, and the seal portion 42 is made of rubber material. The spacer portion 41 is similar to the second embodiment in that the collar portion 41a is formed. Although it is composed of a tubular portion 41b and a flange portion 41c, the tubular portion 41b is not recessed. Further, although a slit 40b is provided in the tubular portion 41b, an inwardly depressed claw 40c is provided in the center of the slit 40b as shown in FIG. This claw 40c
When the wheel speed sensor is inserted into the spacer 40, the wheel speed sensor is elastically engaged with and fixed to the wheel speed sensor.

[0034]

As described above, according to the wheel speed sensor of the present invention, the seal member for preventing the leakage of the lubricating oil is prevented from falling off without increasing the number of parts, and the wheel speed sensor is installed in the mounting hole. Can be firmly fixed.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a mounting structure of a wheel speed sensor according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of a spacer used in the first embodiment of the present invention.

3 is a sectional front view taken along line [3]-[3] in FIG.

FIG. 4 is a sectional front view showing a mounting structure of a wheel speed sensor according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional plan view of a spacer used in the second embodiment of the present invention.

6 is a front sectional view taken along line [6]-[6] in FIG.

FIG. 7 is a partial cross-sectional plan view of a spacer used in a modified example of the present invention.

8 is a front sectional view taken along line [8]-[8] in FIG.

FIG. 9 is a sectional front view showing a mounting structure of a wheel speed sensor according to a conventional example of the present invention.

[Explanation of symbols]

 1 Spacer Part 2 Seal Part 3 Bracket 6 Housing 7 Mounting Hole 9 Wheel Speed Sensor 10 Spacer 11 Spacer Part 12 Sealing Part 13 Bracket 16 Housing 17 Mounting Hole 19 Wheel Speed Sensor 20 Spacer 21 Spacer 22 Sealing Member 27 Mounting Hole 29 Wheel Speed Sensor

Claims (4)

[Claims] 1. A mounting structure for a wheel speed sensor, which is inserted into a mounting hole formed in a non-rotating portion of a vehicle and has its tip facing a member to be detected which rotates with a wheel. In a wheel speed sensor mounting structure in which a cylindrical spacer that elastically engages with both of the inner periphery of the mounting hole and fixes the wheel speed sensor to the mounting hole is arranged, in the spacer, A wheel speed sensor mounting structure in which a seal portion for sealing between the wheel speed sensor and the mounting hole is integrally formed. 2. The mounting structure for a wheel speed sensor according to claim 1, wherein the spacer and the seal portion are integrally formed of a rubber material. 3. The spacer is made of a metal material,
The wheel speed sensor mounting structure according to claim 1, wherein the seal portion is formed of a rubber material, and the seal portion is integrally formed with the spacer by molding. 4. The wheel speed sensor mounting structure according to claim 3, wherein a flange portion is formed on an end portion of the spacer, and the seal portion is provided on the flange portion.