JPH10338112A - Transmission device for wheel rotation detecting signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily transmit a detecting signal indicating wheel rotation, from a wheel rotation sensor to the body side with a simple constitution. SOLUTION: A pair of conductors 31, 31 for transmitting a detecting signal indicating the rotation speed of a wheel, to the body BD side from a wheel rotation sensor 14 assembled to a hub carrier 11 for rotatably supporting a wheel W are bonded along a coil spring 22 disposed between the hub carrier 11 and the body BD. When the hub carrier 11 is displaced in relation to the body Bd, the conductors 31, 31 are expanded/contracted along with the coil spring 22, so that flexure of the conductors 31, 31 can be reduced to eliminate severance of wire or the like caused by interference of the conductors 31, 31 with other parts. It can also be so constituted that an outer spring and an inner spring formed of conductive elastic members are coaxial arranged to transmit the signal without using harness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transmitting a wheel rotation detection signal transmitted from a wheel rotation sensor mounted on a wheel support member rotatably supporting a wheel to a vehicle body.

[0002]

2. Description of the Related Art Conventionally, in this type of apparatus, a wire fixing bracket is provided on a wheel supporting member (for example, a hub carrier), a strut, a spring receiving portion of the strut, and a wheel house, and one end is connected to a wheel rotation sensor. A lead wire is fixed to each of the brackets and is disposed along the strut and the wheel house so as to be guided to the vehicle body.

As another conventional apparatus, for example, as disclosed in Japanese Patent Application Laid-Open No. 63-82863, a strut is made of a metal member having high magnetic permeability, and electromagnetic coils are provided at both ends of the strut. The high-frequency signal is modulated by the signal from the wheel rotation sensor, the modulated signal is guided to the lower electromagnetic coil, and the signal transmitted to the upper electromagnetic coil via the magnetic flux is guided to the main body side by a conducting wire for demodulation. I have.

[0004]

In the former conventional device, when the vehicle bounces, rebounds, and turns,
That is, when the hub carrier and the strut are displaced with respect to the vehicle body, the conductor provided between the strut and the wheel house is slackened to absorb expansion and contraction and rotation of the conductor. As a result, the slackened conductor interferes with parts such as struts, wheel houses, and brake hoses, causing abnormal noise due to the interference, breaks in the conductor, and brake oil leakage due to damage to the brake hose. During traveling, the position of the conductor changes due to the adhesion of snow, and the conductor interferes with other parts as described above,
There is a problem that a large amount of ice adheres to the conductor, which hinders steering of the wheels to the left and right.

Further, in the latter conventional device, there is a problem that an extra circuit or mechanism for modulating and demodulating a signal is required and the structure of the entire device becomes complicated.
There is a problem that the signal transmitted from the wheel rotation sensor to the vehicle body side is affected by the high-frequency signal from the high-voltage cable buried in the ground and does not accurately represent the rotation of the wheel.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a device for transmitting a wheel rotation detection signal which transmits a detection signal representing the rotation of a wheel with a simple structure. Is to do.

A first structural feature of the present invention is that one end is connected to a wheel rotation sensor that is attached to a wheel support member that rotatably supports a wheel and detects rotation of the wheel.
In a transmission device for a wheel rotation detection signal including a pair of conductors for transmitting a detection signal representing the rotation of a wheel detected by the wheel rotation sensor to a vehicle body, the pair of conductors may be the wheel support member and the vehicle body. The vehicle body is disposed along a coil spring that elastically supports the vehicle body with respect to the wheel support member. In the present invention configured as described above, when the wheel supporting member is displaced with respect to the vehicle body, the conductive wire expands and contracts together with the coil spring, so that the conductive wire can be prevented from bending. Therefore, according to the present invention, disconnection or the like due to interference between a conductor and other components can be eliminated, and a detection signal representing wheel rotation can be transmitted from the wheel rotation sensor to the vehicle body satisfactorily with a simple configuration. Can be.

A second structural feature of the present invention is that one end is connected to a wheel rotation sensor that is attached to a wheel supporting member that rotatably supports the wheel and detects rotation of the wheel. In a transmission device for a wheel rotation detection signal including a pair of conductors for transmitting a detection signal representing the rotation of a wheel detected by the wheel rotation sensor to a vehicle body, the pair of conductors may be the wheel support member and the vehicle body. The first and second coil springs are coaxially disposed between the first and second coil springs.

In the invention configured as described above, a cable, a harness, or the like is not used as a conducting wire.
Since the detection signal from the wheel rotation sensor can be transmitted to the vehicle body via the first and second coil springs arranged coaxially, the conductor does not interfere with other parts. Therefore, similar to the above, with a simple configuration,
A detection signal indicating the rotation of the wheel can be transmitted favorably from the wheel rotation sensor to the vehicle body.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

A. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a part of a vehicle suspension device. This suspension device comprises a hub carrier 11 connected to wheels W, the hub carrier 11 and a vehicle body BD.
And a strut 21 and a coil spring 22 which are coaxially arranged between them.

A hub carrier (wheel support member) 11 rotatably supports a hub 12 that rotates in conjunction with a wheel W via a bearing 13.

The strut 21 has a built-in damper and attenuates vibration of the vehicle body BD with respect to the hub carrier 11, and is attached to the hub carrier 11 at its lower end.
The upper end is attached to the vehicle body BD via an upper mount 23. The coil spring 22 is mounted on the body BD
Is elastically supported with respect to the hub carrier 11,
The lower end is supported by a strut spring receiving portion 24 fixed on the outer peripheral surface of the strut 21, and the upper end is supported by an upper sheet 25 via a cover 26. The upper sheet 25 is attached to the upper end of the strut 21 together with the upper mount 23 by a bolt 27.

A wheel rotation sensor 14 is mounted on the inner lower surface of the hub carrier 11. This wheel rotation sensor 1
Reference numeral 4 denotes an electromagnetic pickup, a magnetoresistive element, and the like, which are arranged to face the sensor 14 and correspond to the rotation of a magnetic rotating plate 15 on which an N pole and an S pole are alternately magnetized on the outer peripheral surface. To output a pulse train signal. The magnetic rotating plate 15 is fixed to a cylindrical rotor 16 made of a non-magnetic material and fixed to an inner end of the hub 12.

The wheel rotation sensor 14 includes a pair of wires 3.
One ends of the first and the first 31 are connected via a connector (not shown). As shown in FIG. 2, the pair of conductive wires 31, 31 covered with the covering member 32 is further covered with an insulating elastic member 41 from above the covering member 32, and the wheel rotation speed from the sensor 14 is reduced. The pulse train signal is directed to the vehicle body. Note that one of the pair of conducting wires 31 is a signal line, and the other is a ground line. A pair of conducting wires 31, 31 connected to the wheel rotation sensor 14 are guided upward along the surface of the hub carrier 11, are positioned by a bracket 28 fixed to a lower outer peripheral surface of the strut 21, and are provided on the spring receiving portion 24. Through the hole 24a to be guided above the spring receiving portion 24. The pair of conducting wires 31, 31 guided above the spring receiving portion 24 are parallel to the coil spring 22 from a position one turn above the lower end of the coil spring 22 to a position one turn below the upper end of the coil spring 22. And close contact with the spring 2
2 is adhered on the outer peripheral surface. In this case, the elastic member 41 is adhered on one side to the outer peripheral surface of the coil spring 22 along the axial direction with an adhesive. Further, the pair of conducting wires 31, 31 penetrate through the holes 26 a, 25 a, BDa provided in the cover 26, the upper sheet 25, and the vehicle body BD at positions above the elastic member 41, respectively, and are guided to the vehicle body side. The other ends of the pair of conducting wires 31 are connected to an electric control device mounted on the vehicle body via a connector 33.

Next, the operation of the first embodiment constructed as described above will be described. When the vehicle body bounces and rebounds, or when the vehicle turns, that is, when the hub carrier 11 is displaced with respect to the vehicle body BD, When the spring 22 expands and contracts, at least an intermediate portion of the pair of conductive wires 31 and 31 is displaced together with the coil spring, so that the bending of the conductive wires 31 and 31 can be reduced.
Therefore, in the first embodiment, the pair of conductors 31, 31 does not interfere with other components, and disconnection of the conductors 31, 31 can be eliminated. As a result, it is possible to transmit a detection signal indicating the rotation of the wheel from the wheel rotation sensor 14 to the vehicle body with a simple configuration.

Next, a modification of the first embodiment will be described. In this modification, as shown in FIG. 3, a plurality of clamps 42 are attached to a middle portion of a pair of conductive wires 31 at substantially constant intervals and fix the conductive wires 31 to the coil spring 22. . Clamp 42
Is an annular portion 42a formed of an elastic material and fixed on the outer periphery of the covering member 32, and a pair of sandwiching portions 42b and 42c integrally provided on one side of the annular portion 42a and sandwiching the coil spring 22. Consists of Then, the inner peripheral surfaces of the holding portions 42 b and 42 c of the plurality of clamps 42 are brought into close contact with the outer periphery of the coil spring 22, and
2 is attached to the coil spring 22, so that a pair of conductive wires 31, 31 covered by the covering member 32 are formed.
From a position one turn above the lower end of the coil spring 22 to a position one turn lower than the upper end of the coil spring 22, it is fixed on the outer peripheral surface of the spring 22 in parallel and close contact with the coil spring 22. I have. Therefore, according to this modification, the same effect as that of the first embodiment can be expected for the above-described reason.

B. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. The suspension device according to the second embodiment has the same configuration as that of the first embodiment. Therefore, the same devices as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The suspension device according to the second embodiment is formed of a coil made of a conductive material, and is formed of an outer spring (a second spring) for guiding a pulse train signal indicating the wheel rotation speed from the wheel rotation sensor 14 to the vehicle body. A first coil spring 51 and an inner spring (second coil spring) 52 are coaxially provided. The outer spring 51 has a large thickness, elastically supports the vehicle body BD with respect to the hub carrier 11, and functions as a ground line for transmitting a pulse train signal. Also,
The inner spring 52 is configured to be relatively thin,
It has almost no function of supporting the vehicle body BD and functions as a signal line for transmitting a pulse train signal. As shown in FIG. 5, the outer spring 51 and the inner spring 52 are in contact with the upper sheet rubber 61 tightly fixed to the lower surface of the flange portion of the cover 26, as shown in FIG. On the other hand, the lower ends of the springs 51 and 52 are in contact with the lower sheet rubber 71 which is fixed to the upper surface of the spring receiving portion 24 in the same manner as the upper ends.

As shown in FIG. 6, the upper sheet rubber 61 is formed of an insulating elastic material in a circular shape, and has a hole 61a through which the strut 21 and the cover 26 pass. A first conductive pattern 62 made of a conductive material and having a width substantially equal to the diameter of the outer spring 51 is provided along the circumferential direction on the lower peripheral edge of the upper sheet rubber 61. Further, on the lower surface of the upper sheet rubber 61 and inside the first conductive pattern 62,
A second conductive pattern 63 made of a conductive material and having a width substantially equal to the diameter of the inner spring 52 is provided along the circumferential direction. These first conductive patterns 62
The upper ends of the outer spring 51 and the inner spring 52 are in contact with the second conductive pattern 63, respectively. One end of each of the first conductive pattern 62 and the second conductive pattern 63 is connected to a connector 64 fixed to a peripheral portion of the upper sheet rubber 61.

The connector 64 has a pair of conducting wires 31, 31.
Is connected via a connector 34. The pair of conducting wires 31, 31
D is guided to the vehicle body side through a hole BDa provided in D, and the other ends of the conductive wires 31 are connected to an electric control device mounted on the vehicle body via a connector 33.
On the other hand, as shown in FIG. 7, the lower sheet rubber 71 is formed in a circular shape with an insulating elastic material, and has a hole 71a through which the strut 21 penetrates near the center. On the upper surface of the lower sheet rubber 71, the upper sheet rubber 61 is provided.
Similarly, a first conductive pattern 72 and a second conductive pattern 73 made of a conductive material are provided along the circumferential direction. The lower ends of the outer spring 51 and the inner spring 52 are in contact with the first conductive pattern 72 and the second conductive pattern 73, respectively. One end of each of the first conductive pattern 72 and the second conductive pattern 73 is connected to a connector 74 fixed to a peripheral portion of the lower sheet rubber 71.

The connector 74 has a pair of conductive wires 31, 31.
Are connected via a connector 35. The pair of conductive wires 31, 31 is positioned by the bracket 28 as in the case of the first embodiment, and is guided downward along the surface of the hub carrier 11. A pair of conductive wires 31 and 3
The other end of 1 is connected to a vehicle rotation sensor 14 attached to the hub carrier 11 via a connector (not shown).

Next, in the second embodiment configured as described above, a part of the pair of conducting wires 31 is formed by the outer spring 51 and the inner spring 52, and the wheel rotation speed from the wheel rotation sensor 14 is detected. Can be transmitted to the vehicle body via the outer spring 51 and the inner spring 52, so that there is no need to use a harness or the like, and a pair of conductors (the outer spring 5
1 and the inner spring 52) can be prevented from interfering with other components. Further, since the inner spring 52 functioning as a signal line is disposed inside the outer spring 51 functioning as a ground line, it is possible to prevent the inner spring 52 from contacting other components. Therefore, the inner spring 52 is protected by the outer spring 51, and there is no problem such as disconnection, and the detection signal indicating the rotation of the wheel can be transmitted from the wheel rotation sensor 14 to the vehicle body with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view showing the entire suspension device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a coil spring portion to which a pair of conductive wires of FIG. 1 are bonded.

FIG. 3 is a cross-sectional view of a coil spring portion according to a modification of the first embodiment, in which a pair of conductive wires is fixed by a clamp.

FIG. 4 is a partially cutaway view showing the entire suspension device according to a second embodiment of the present invention.

FIG. 5 is an enlarged view of a portion A in FIG.

FIG. 6 is a bottom view of the upper sheet rubber.

FIG. 7 is a top view of the lower sheet rubber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Hub carrier, 14 ... Wheel rotation sensor, 15 ... Magnetic rotating plate, 21 ... Strut, 22 ... Coil spring, 24 ... Strut spring receiving part, 25 ... Upper seat, 26 ... Cover, 31 ... One pair of conducting wires, 33 , 34,
35 connector, 41 elastic member, 42 clamp, 5
1: outer spring, 52: inner spring, 61
... upper sheet rubber, 71 ... lower sheet rubber.

Claims (2)

[Claims] 1. One end is connected to a wheel rotation sensor that is attached to a wheel support member that rotatably supports a wheel and detects rotation of the wheel, and detects the rotation of the wheel detected by the wheel rotation sensor. A wheel rotation detection signal transmission device having a pair of conductors for transmitting the detected detection signal to the vehicle body side, wherein the pair of conductors is provided between the wheel support member and the vehicle body, and the vehicle body is supported by the same wheel. A transmission device for a wheel rotation detection signal, wherein the transmission device is disposed along a coil spring that elastically supports a member. 2. One end is connected to a wheel rotation sensor that is attached to a wheel support member that rotatably supports the wheel and detects the rotation of the wheel, and detects the rotation of the wheel detected by the wheel rotation sensor. A wheel rotation detection signal transmission device including a pair of conductors for transmitting the detected detection signal to the vehicle body side, wherein a pair of the conductors is coaxially disposed between the wheel support member and the vehicle body. And a second coil spring for transmitting a wheel rotation detection signal.