JPH0789419A - Mounting structure of vehicle speed sensor for automobile - Google Patents

Abstract

PURPOSE:To reduce cost by increasing the sealing property against muddy water and suppressing the occurrence of rust in an automobile on which an ABS is mounted. CONSTITUTION:In an automobile in which a drive shaft 11 is inserted into a knuckle 2 installed at the lower part of a suspension strut and a vehicle speed sensor 1 to detect the rotational condition of the drive shaft 11 is installed, a recessed part 28 is formed at the insert part of the knuckle 2 through which the drive shaft 11 is inserted, and an oil seal fitting 30 provided with a dust cover part 29 is pressed into the recessed part 28. Also a protruded hole part 31 into which the detection part 1a of the vehicle speed sensor l is closely fitted is formed around the outer periphery of the dust cover part 29. Thus, when the detection part 1a is fitted closely into the protruded hole part 31, the outer periphery of the detection part la is covered by the protruded hole part 31, the height of the protruded hole part 31 becomes larger than the distance between the detection part 1a and the dust cover part 29, and the resistance against muddy water is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed sensor mounting structure applied to a vehicle equipped with an antilock brake system.

[0002]

2. Description of the Related Art Some vehicles are equipped with an anti-lock brake system (hereinafter referred to as ABS) that prevents the wheels from locking even when a sudden brake is applied. This is to detect the rotation status of the wheels with a vehicle speed sensor, control the brake fluid pressure according to various road surface conditions, to secure the directional stability and maneuverability of the vehicle during sudden braking and to improve the braking performance. To do.

The attachment of the ABS vehicle speed sensor will be described below. First, based on Figure 10 to Figure 13,
The area around the knuckle 2 to which the vehicle speed sensor 1 (see FIG. 14) is attached will be briefly described.

As shown in the figure, the knuckle 2 is provided with a mounting arm portion 3. By fixing the mounting arm portion 3 to a lower portion of the suspension strut 4 with a bolt 5, the knuckle 2 is fixed to the suspension strut 4. It is installed. Further, an end portion of a lower arm 7 is connected to a lower attachment portion 6 (see FIG. 13) of the knuckle 2.

Further, an insertion hole 8 is provided at the center of the knuckle 2.
Is formed, and the insertion hole 8 has a bearing 9 including an outer bearing 9a and an inner bearing 9b, and a hub.
The drive shaft 11 provided with 10 is inserted.

A disc rotor 12 for disc brakes is attached to the hub 10 by bolts 13, and a wheel 16 having a tire 14 mounted on a rim 15 is also attached to the hub 10.

Conventionally, as described above, the vehicle speed sensor 1 is attached to the knuckle 2, as shown in FIG. 9, and the sensor ring 17 fixed to the drive shaft 11 is detected by the detecting portion 1a ( Reference numeral A in FIG. 10 indicates a mounting portion of the vehicle speed sensor 1.

That is, the vehicle speed sensor 1 is attached to the knuckle 2 with its detecting portion 1a facing the drive shaft 11, and a sensor ring 17 is attached to the position of the drive shaft 11 facing the detecting portion 1a.

As a result, when the drive shaft 11 rotates, the sensor ring that rotates together with the drive shaft 11
The vehicle speed sensor 1 detects 17 and the rotation state of the wheels is checked.

A dust cover 18 is interposed between the sensor ring 17 and the vehicle speed sensor 1, and the dust cover 18 prevents dust and muddy water from entering.

However, when muddy water is applied to the mounting portion of the ABS sensor 1 from the outside (in the direction of arrow B), the muddy water passes through the gap D1 between the hole of the dust cover 18 and the detection portion 1a of the vehicle speed sensor 1, The flow C penetrates into the dust cover 18.

When muddy water enters, the sensor ring 17 is rusted and accurate detection cannot be performed, and the bearing 9
May be damaged. In order to prevent this, conventionally, a pad 19 is interposed between the vehicle speed sensor 1 and the dust cover 18.

Further, as a means for preventing dust from entering, as shown in FIG. 15, an oil seal fitting 21 having a dust cover portion 20 is provided on the outer periphery of the sensor ring 17 as shown in FIG.

In FIG. 12, reference numeral 22 is an inner oil seal, and reference numeral 23 is an inner race. Reference numeral 24 indicates a snap ring and reference numeral 21a indicates an outer oil seal.

As a vehicle bearing device, Japanese Patent Laid-Open No. 64-2
Some are disclosed in Japanese Patent No. 8056. The one disclosed in this publication is provided with an inner ring attached to a wheel and an outer ring attached to a vehicle body, which is fitted to the inner ring via rolling elements, and the inner ring has a rotational speed of the wheel. A pulse output ring for generating a corresponding signal is provided, a sensor for detecting the number of rotations of the ring is provided on the outer ring, and a bearing seal that is in sliding contact with the ring is attached to the outer ring.

[0016]

In the prior art described above, as shown in FIG. 14, when a pad is interposed between the vehicle speed sensor and the dust cover, the pad is
There was a problem that it became necessary and costly. Further, when the pad is used, there has been a problem that the sealing property is deteriorated due to secular change or deterioration of the pad. Furthermore, the number of man-hours for assembling and managing the pad is separately required, which also causes a problem of further increase in cost.

Further, as shown in FIG. 15, in the case where an oil seal fitting having a dust cover portion is provided on the outer circumference of the sensor ring, the sensor ring is exposed, so that the sensor ring is exposed to muddy water or the like. There was a risk of scratches and rust. When rust occurs, there is a problem that it is difficult to detect the accurate rotation status. There is also a problem that the sealing performance of the oil seal fitting is deteriorated by the infiltrated muddy water.

In the vehicle bearing device disclosed in Japanese Patent Laid-Open No. 64-28056, the rotational speed of the wheel is set between the inner ring mounted on the wheel and the outer ring mounted on the inner ring via rolling elements. A pulse output ring that generates a signal according to the above, and a sensor that detects this ring are provided, and since a bearing seal that is in sliding contact with the ring is attached to the outer ring, dust from the outside does not enter the sensor part. However, it is difficult to prevent oil from entering.

The present invention has been made to solve the above-mentioned conventional problems, and is an oil seal fitting provided with a dust cover and a deflector fitting provided on a drive shaft so as to cover the detection portion of the vehicle speed sensor. The purpose of the present invention is to provide a mounting structure for a vehicle speed sensor for an automobile, in which a labyrinth is formed by means of which the sealing property is improved, the cost is suppressed, and the occurrence of rust is prevented.

[0020]

As a means for solving the above problems, the present invention provides a vehicle speed sensor for inserting a drive shaft into a knuckle provided at a lower portion of a suspension strut and detecting a rotation state of the drive shaft. In the mounted automobile, a recess is formed in the drive shaft insertion portion of the knuckle, an oil seal fitting having a dust cover portion is press-fitted into the recess, and the detection portion of the vehicle speed sensor is provided on the outer periphery of the dust cover portion. It is characterized in that a protruding hole portion for fitting is formed.

Further, according to the present invention, in a vehicle in which a drive shaft is inserted into a knuckle provided at a lower portion of a suspension strut and a vehicle speed sensor for detecting a rotation state of the drive shaft is attached, an insertion portion of the drive shaft of the knuckle is provided. It is characterized in that an oil seal fitting having a dust cover portion is press-fitted and an edge portion of the dust cover portion is extended inward in the vehicle width direction.

Furthermore, the present invention is characterized in that the end portion of the dust cover portion extending inward in the vehicle width direction is covered with the end portion of the deflector press-fitted into the drive shaft.

Further, according to the present invention, both the end of the dust cover extending inward in the vehicle width direction and the end of the deflector press-fitted into the drive shaft are both bent outward in the axial direction of the drive shaft. It is characterized by.

[0024]

According to the present invention, the oil seal fitting having the dust cover portion is press-fitted into the recess formed in the insertion portion of the drive shaft of the knuckle, and the detection portion of the vehicle speed sensor is fitted around the dust cover portion of the oil sill fitting. Since the protruding hole portion is formed, the outer periphery of the detecting portion is covered by the protruding hole portion when the detecting portion is fitted into the protruding hole portion, and the protruding portion of the protruding hole portion is larger than the distance between the detecting portion and the dust cover portion. The height becomes larger, and it becomes possible to improve the prevention property against muddy water.

Further, according to the present invention, the end portion of the dust cover portion of the oil seal fitting press-fitted into the insertion portion of the drive shaft of the knuckle is extended inward in the vehicle width direction. It is possible to prevent the intrusion of the like.

Further, according to the present invention, since the end of the dust cover portion of the oil seal fitting press-fitted into the insertion portion of the drive shaft of the knuckle is covered by the end portion of the deflector press-fitted into the drive shaft, this overlapping portion is a labyrinth. The structure makes it possible to prevent infiltration of muddy water and the like and protect the sensor ring and the oil seal.

Further, according to the present invention, both the end portion of the dust cover portion extending inward in the vehicle width direction and the end portion of the deflector press-fitted into the drive shaft are bent outward in the axial direction of the drive shaft. However, this also complicates the labyrinth structure and makes it possible to prevent dust from entering.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1 with the same members as those in FIGS. First, the periphery of the knuckle 2 provided below the suspension strut 4 (see FIG. 10) of the automobile will be described with reference to FIGS. 6 to 8.

As shown in the figure, the knuckle 2 is provided with a mounting arm portion 3. By mounting the mounting arm portion 3 on the lower portion of the suspension strut 4, the knuckle 2 is fixed. . Further, the knuckle 2 is formed with a lower mounting portion 6 to which an end portion of a lower arm (see FIG. 10) is mounted.

Further, an insertion hole 8 through which a drive shaft 11 having a hub 10 (see FIG. 10) is inserted is provided at the center of the knuckle 2. Hub of this drive shaft 11
A disc rotor 12 for a disc is fixed to 10.

A sensor mounting portion 25 to which the above-described ABS vehicle speed sensor 1 is mounted is provided at a position facing the insertion hole 8 of the knuckle 2. A fitting hole 26 and a bolt hole 27 into which the case body of the vehicle speed sensor 1 is fitted are formed in the sensor mounting portion 25 (see FIG. 9).

As shown in FIG. 1, a recess 28 is formed in the insertion portion of the drive shaft 11 of the knuckle 2, that is, inside the insertion hole 8 formed in the knuckle 2, where the vehicle speed sensor 1 is attached. ing. The concave portion 28 faces the dust cover portion 29 of the oil seal fitting 30 that is press-fitted into the knuckle 2.

Further, on the outer circumference of the dust cover portion 29 of the oil seal fitting 30, there is formed an outwardly projecting hole portion 31 into which the detecting portion 1a of the vehicle speed sensor 1 attached to the knuckle 2 is fitted. There is. The end portion 29a of the dust cover portion 29 extends inside the vehicle width direction.

A projecting hole formed in the dust cover portion 29
The detection portion 1a of the vehicle speed sensor 1 fitted in 31 faces a sensor ring 17 fixed to the drive shaft 11.

As a result, when the drive shaft 11 rotates, the sensor ring that rotates together with the drive shaft 11
17 is detected by the detection unit 1a of the vehicle speed sensor 1, and the rotation status of the wheels is checked.

When the oil seal fitting 30 having the dust cover portion 29 is press-fitted into the concave portion 28 formed in the knuckle 2, the projecting hole portion 31 of the dust cover portion 29 is formed by the concave portion 28 of the knuckle 2. When attaching the dust cover part 29, the dust cover part 29 may interfere with the part 28a.
As shown in FIG. 2, the length L1 of the above is set sufficiently outside so that the projecting hole 31 is fitted into the recess 28 of the knuckle 2 from below, and the oil seal fitting 30 is press-fitted in the direction of arrow E. By doing so, it is possible to avoid interference.

That is, the assembling order to the knuckle 2 is shown in FIG. First of all, the oil seal fitting 30
Is press-fitted into the concave portion 28 of the knuckle 2 (arrow F), and then the vehicle speed sensor 1 is assembled into the fitting hole 26 of the sensor mounting portion 25 provided in the knuckle 2 (arrow G). The drive shaft 11 mounted with is attached to the insertion hole 8 (arrow H).

When the drive shaft 11 is assembled in this way, the extended end portion 29a of the dust cover portion 29 is covered by the rising portion of the end portion 32a of the deflector 32 press-fitted into the drive shaft 11.

The end 29a of the dust cover portion 29 of the oil seal fitting 30 press-fitted and the end 32a of the deflector 32 press-fitted to the drive shaft 11 are both bent outward in the axial direction of the drive shaft 11. ing.

Since the present embodiment is constructed as described above, in FIG. 1, muddy water enters from the direction of arrow I, and further the projecting hole portion 31 of the dust cover portion 29 and the vehicle speed sensor 1 are provided.
The muddy water entering through the gap D2 between the
The labyrinth dimension of L2 can be taken, and the waterproof property against muddy water is improved.

Further, the end portion 29a of the dust cover portion 29 of the oil seal fitting 30 is extended inward in the vehicle width direction, and the extended end portion 29a is pressed into the drive shaft 11 so that the end portion of the deflector 32 is pressed. Since it was covered by the rising part of 32a,
This overlapping portion has a labyrinth structure, which makes it possible to protect the sensor ring 17 portion and the oil seal fitting 30.

Further, the end portion 29 of the extended dust cover portion 29 is
a and the end 32a of the deflector 32 that is press-fitted into the drive shaft 11 are both bent outward in the axial direction of the drive shaft 11, which also forms a more excellent labyrinth structure and prevents dust from entering. It becomes possible to do.

Next, another embodiment of the present invention will be described with reference to FIGS. The same members as those in FIGS. 1 to 3 are designated by the same reference numerals. The feature of this embodiment is that an oil provided with a dust cover portion 29 is directly provided on the insertion portion of the drive shaft 11 of the knuckle 2 without forming the above-described recessed portion 28 on the insertion portion of the drive shaft 11. The seal fitting 30 is press-fitted.

The end portion 29a of the dust cover portion 29 is covered with the end portion 32a of the deflector 32 press-fitted into the drive shaft 11, and the end portion 29a of the dust cover portion 29 and the end portion 32a of the deflector 32 are both attached to the drive shaft. It is bent to the outside in the axial direction of 11.

In the present embodiment, as described above, the end portion 29a of the dust cover portion 29 of the oil seal fitting 30 which is press-fitted into the insertion portion of the drive shaft 11 of the knuckle 2 is extended inward in the vehicle width direction. By this extended portion, it becomes possible to prevent infiltration of muddy water or the like.

The dust cover portion of the oil seal fitting 30 press-fitted into the insertion portion of the drive shaft 11 of the knuckle 2
Since the end portion 29a of 29 is covered by the end portion 32a of the deflector 32 that is press-fitted into the drive shaft 11, the overlapped portion becomes a labyrinth structure and the sensor ring
It becomes possible to protect 17 and the seal part.

Further, the end 29a of the dust cover 29 extending inward in the vehicle width direction and the end 32a of the deflector 32 press-fitted into the drive shaft 11 are both bent outward in the axial direction of the drive shaft 11. Therefore, this also complicates the labyrinth structure and prevents dust from entering.

[0048]

As described above, according to the present invention, a recess is formed in the insertion portion of the drive shaft of the knuckle provided in the lower portion of the suspension strut, and an oil seal fitting having a dust cover is press-fitted into this recess. Since a projecting hole into which the detection part of the vehicle speed sensor fits is formed on the outer periphery of the dust cover part, a pad as a separate component for sealing the gap between the vehicle speed sensor and the dust cover part is unnecessary. As a result, it is advantageous in terms of assembly and management man-hours and can suppress cost increase.

Further, the performance is stable because a member such as a pad which is aged and deteriorated is not used.

Further, according to the present invention, since the end of the dust cover portion of the oil seal fitting press-fitted into the recess 28 formed in the insertion portion of the drive shaft of the knuckle is extended inward in the vehicle width direction, it is possible to prevent muddy water from entering. It is possible to prevent, protect the sensor ring, and suppress the generation of rust. This makes it possible to detect an accurate rotation situation. Furthermore, the sealing performance of the oil seal can be suppressed.

Furthermore, according to the present invention, the end of the dust cover portion extending inward in the vehicle width direction is covered with the end of the deflector press-fitted into the drive shaft.
A labyrinth structure can be formed and both the sensor ring and the oil seal can be protected. As a result, the occurrence of rust can be suppressed, and the accurate rotation status can be detected.

Further, since both the end of the dust cover portion extending inward in the vehicle width direction and the end of the deflector press-fitted into the drive shaft are bent outward in the axial direction of the drive shaft, the density is further increased. A labyrinth structure can be formed and the sensor ring and the oil seal can be protected as described above. This suppresses the occurrence of rust,
It is possible to detect an accurate rotation situation. Further, it is possible to suppress the deterioration of the sealability of the oil seal.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing press fitting of the oil seal fitting shown in FIG.

FIG. 3 is a view showing an assembling order of oil seal fittings.

FIG. 4 is a partial cross-sectional view of an essential part showing another embodiment of the present invention.

5 is an enlarged cross-sectional view of a J portion of FIG.

FIG. 6 is a front view of the knuckle of FIG.

FIG. 7 is a right side view of FIG.

8 is a sectional view taken along the line KK of FIG.

9 is a view from the arrow L of the sensor mounting portion shown in FIG.

FIG. 10 is a cross-sectional view for explaining a front hub portion of an automobile.

FIG. 11 is a perspective view of a suspension strut and a simplified knuckle.

FIG. 12 is a perspective view of a knuckle.

13 is a perspective view of the knuckle shown in FIG. 12 viewed from the back side.

FIG. 14 is a front view showing a conventional knuckle provided with a dust cover.

FIG. 15 is a front view showing a conventional knuckle provided with an oil seal fitting.

[Explanation of symbols]

 1 Vehicle speed sensor 2 Knuckle 4 Suspension strut 11 Drive shaft 28 Recess 29 Dust cover 29a End 30 Oil seal fitting 31 Projected hole 32 Deflector 32a End

Claims (4)

[Claims] 1. In a vehicle in which a drive shaft is inserted into a knuckle provided at a lower portion of a suspension strut and a vehicle speed sensor for detecting a rotation state of the drive shaft is attached, a recess is formed in an insertion portion of the drive shaft of the knuckle. Then, an oil seal fitting having a dust cover portion is press-fitted into the concave portion, and a protruding hole portion into which the detection portion of the vehicle speed sensor is fitted is formed on the outer periphery of the dust cover portion. Sensor mounting structure. 2. A vehicle having a drive shaft inserted into a knuckle provided at a lower portion of a suspension strut and a vehicle speed sensor for detecting a rotation state of the drive shaft, wherein a dust cover portion is provided at an insertion portion of the drive shaft of the knuckle. A mounting structure for a vehicle speed sensor for an automobile, characterized in that an oil sill metal fitting that is included is press-fitted and an end portion of a dust cover portion is extended inward in a vehicle width direction. 3. The mounting structure for a vehicle speed sensor for an automobile according to claim 2, wherein an end of a dust cover extending inward in the vehicle width direction is covered with an end of a deflector press-fitted into a drive shaft. 4. The dust cover portion extending inward in the vehicle width direction and the end portion of the deflector press-fitted into the drive shaft are both bent outward in the axial direction of the drive shaft. The mounting structure for the vehicle speed sensor according to claim 3.