JP2003329403A - Vehicle height detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle height detector with wire taking-up function, which has a small and simple structure, and can improve the degree of freedom of the attachment position to a vehicle. <P>SOLUTION: The detector comprises a wire W which is coupled, at its one end, to one side of a vehicle axis or a vehicle body of the vehicle, a taking-up means 14 which is arranged at the other side of the vehicle axis or the vehicle body, and can take up the wire around a taking-up axis 14A by coupling the other end W2 of the wire to the taking-up axis, a tension imparting means 15 which imparts tension in a direction of taking up the wire around the taking-up axis of the taking-up means so as to take up or reel out the wire to or from the taking-up axis according to the change in relative height between the vehicle axis and the vehicle body, and a detecting means 2 which detects the displacement of the wire moving in and out of the taking-up axis, and the relative height between the vehicle axis and the vehicle body is detected based on the displacement of the wire detected by the detecting means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle height detecting device which is arranged in a vehicle such as an automobile and detects a relative height between a vehicle body and an axle.

[0002]

2. Description of the Related Art In a vehicle such as an automobile, when the rear portion of the vehicle body is sunk into the rear wheel axle due to luggage mounted on a luggage carrier or a trunk at the rear portion of the vehicle body, the front portion of the vehicle body floats up against the front wheel axle and the head The irradiation direction of the lamp may be upward, which may give glare to oncoming vehicles. In order to solve such a problem, conventionally, various optical axis adjusting devices have been proposed which correct the irradiation direction of the headlamp according to the change in the posture of the vehicle body. In this type of apparatus, generally, a vehicle height sensor arranged on each of a rear wheel axle and a front wheel axle detects a height change of a vehicle body with respect to each axle, and based on the detection signal, a change in a tilt angle before and after the vehicle body is detected. It is configured to control the irradiation direction of the headlamp according to this change.

[0003]

In vehicles such as automobiles, a suspension or the like is arranged between the vehicle body and the front and rear wheel axles. Therefore, when a vehicle height sensor is attached to each axle, In addition, there is a problem that the installation space and the installation position of the sensor are limited.

The present invention has been made in view of the above points, and provides a vehicle height detection device having a wire winding function, which has a small size and a simple structure and can improve the degree of freedom of a mounting position with respect to a vehicle. Is what you are trying to do.

[0005]

A vehicle height detection device according to the present invention comprises a wire having one end coupled to one of an axle or a vehicle body of a vehicle and a wire disposed on the other of the axle or the vehicle body. Winding means capable of winding the wire around the winding shaft by connecting the other end to the winding shaft, and a tension in the winding direction of the wire with respect to the winding shaft of the winding means. Tension applying means for applying the wire, thereby causing the wire to be wound around the winding shaft or unwound from the winding shaft in accordance with a change in the relative height between the axle and the vehicle body, and in and out of the winding shaft. Detecting means for detecting the displacement of the wire, and detecting the relative height between the axle and the vehicle body based on the displacement of the wire detected by the detecting means. According to this, the displacement of the wire that is wound around the winding shaft of the winding means or that is unwound from the winding shaft and that moves in and out of the winding shaft according to the change in the relative height between the axle and the vehicle body is described above. By detecting with the detection means, the relative height between the axle and the vehicle body can be detected. Further, in detecting the relative height between the axle and the vehicle body, the winding means can be arranged on the other side of the axle or the vehicle body, and therefore, the degree of freedom of the mounting position with respect to the vehicle can be improved. Further, since the wire, the winding means, the tension applying means, and the detecting means can be used, a small and simple structure can be obtained.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present embodiment will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a vehicle height detecting device according to the present invention, and shows a schematic structure of a vehicle height detecting device S having an electromagnetic induction type linear position detector and having a wire winding function. In FIG. 1, the vehicle height detection device S includes a wire W, a winding portion 1 for winding the wire, a linear position detector 2, and the like. The wire W is, for example, a stainless steel wire, and a piano wire or a flexible SUS compliant wire is appropriately used. One end of the wire W is coupled to the axle of the vehicle, as will be explained later.

The winding section 1 has a fixed shaft 13 substantially at the center of shaft holding members 12A and 12B fixed to one end and the other end of a cylindrical case 11. The fixed shaft 13 has one end fixedly held by one shaft holding member 12A and the other end held by the other shaft holding member 12B via a bearing B1. In the case 11, a winding reel 14 for winding the other end (hereinafter, referred to as the other end of the wire) W2 of the wire W and a winding spring 15 made of a spiral spring are arranged. The take-up reel 14 includes a take-up ring 14A and the take-up ring 14A.
It is composed of a pair of side plates 14B and 14C fixed to both ends of A, and each side plate 14B, 14C is fixed shaft 13 respectively.
Is rotatably attached to the bearings via bearings B2 and B3.
A spiral winding groove 14A1 is formed on one end side (right end side in the illustrated example) of the outer peripheral surface of the winding ring 14A, and a part of the winding groove 14A1 is provided on the case 11. The other end W2 of the wire drawn from the introduction port 11A is wound. The other end W2 of the wire penetrates the winding ring 14A and is locked to the inner surface of the winding ring 14A. The winding spring 15 is arranged between the pair of side plates 14B and 14C in the winding ring 14A, and one end 15A thereof is fixed to the fixed shaft 13.
The other end 15B is attached to the winding ring 14A. As a result, the take-up reel 14 is rotated n times in the clockwise direction CW and the other end W2 of the wire is taken up by the take-up ring 1.
A tension (winding force) for winding around 4A is applied to the winding reel 14.

The linear position detector 2 is constructed by using, for example, the technique disclosed in Japanese Patent Application Laid-Open No. 2001-141410 of the present applicant, and the shaft holding member 1 of the winding section 1 is used.
It is placed on the 2B side. For example, the linear position detector 2 includes a screw shaft 21 fixedly attached to one side plate 14C of the take-up reel 14, a ring-shaped magnetic core 22 screwed into the screw shaft 21, and the magnetic core. And a coil portion 23 magnetically coupled to 22. The screw shaft 21 is
It is rotatably held by a shaft holding member 12B on the other end side of the case 11 via a bearing B1 and extends in the axial direction of the fixed shaft 13. The magnetic core 22 is made of a material that changes the magnetic coupling coefficient, such as a magnetic body made of iron or the like, a conductor made of copper or the like, or a combination of a magnetic body and a conductor. This magnetic core 2
2 is a straight line in which a projection 22A provided on the outer peripheral surface is linearly moved with respect to the screw shaft 21 when the screw shaft 21 rotates together with the take-up reel 14 and is recessed on the inner peripheral surface of the coil portion 23. It is engaged with the guide groove 23A. The coil unit 23 includes a plurality of coil sections (four coil sections LA, L in the illustrated example) that are excited by a predetermined one-phase AC signal.
(B, LC, LD) are sequentially arranged along the screw shaft 21 within the moving range of the magnetic core 22. For example, it is assumed that the coil sections LA, LB, LC, and LD have the same properties such as the number of turns and the coil length.

When the vehicle height detecting device S is used as a vehicle height sensor of an optical axis adjusting device, for example, two vehicle height detecting devices S are arranged at arbitrary positions on a vehicle body B of an automobile, as shown in FIG. As an example, the two vehicle height detection devices S may be arranged close to a control unit of an optical axis adjusting device (not shown) provided on the vehicle body. Thereby, the wiring between the linear position detector 2 of each vehicle height detection device S and the control unit can be shortened. Of the two vehicle height detection devices S, one vehicle height detection device S is for detecting the displacement of the relative height position between the vehicle body B and the front wheel axle SF1, and one end W1 of the wire W is Axle S
It is bound to F1. The remaining one vehicle height detection device S is for detecting the displacement of the relative height position between the vehicle body B and the rear wheel axle SF2, and one end W1 of the wire W is, for example, via a roller R or the like. Is coupled to the axle SF2.

In the vehicle height detecting device S having such a configuration, the tension is constantly applied to the take-up reel 14 by the take-up spring 15, so that the rear portion of the vehicle body B in FIG. When the front part of the vehicle body B floats up with respect to the front wheel axle SF1, the take-up reel 14 rotates in the clockwise direction CW, and the other end W2 of the wire is taken up by the take-up groove 14A1 of the take-up ring 14A. Further, when the front portion of the vehicle body B sinks into the front wheel axle SF1, the take-up reel 14 rotates counterclockwise CCW against the tension of the take-up spring 15 and the take-up groove 14A of the take-up ring 14A.
The other end W2 of the wire wound at A1 is paid out. Thus, the amount of rotation of the take-up reel 14 when the other end W2 of the wire is wound or unwound is determined by the vehicle body B and the front wheel axle S.
This corresponds to the amount of change (displacement amount) in relative height with F1. As an example, when the take-up reel 14 is fully rotated three times at the position shown in FIG. 1 to wind the other end W2 of the wire around the take-up ring 14A, the magnetic core 22 has a predetermined length shown by a solid line in FIG. Linearly moves from the reference position to the tip side of the screw shaft 21. As a result, the magnetic core 22 first enters the coil section LA and then the coil sections LB, LC.
In order, and finally into the coil section LD. The amount of penetration (movement amount) of the magnetic core 22 into the coil portion 23 at this time corresponds to the amount of rotation of the take-up reel 14. Reference numeral 22 ′ indicates the position when the magnetic core 22 enters the coil section LD.

In the linear position detector 2, each coil section LA, LB, LC, LD (hereinafter, each coil section LA, L
B, LC, and LD are simply referred to as "coils", and a predetermined one-phase AC signal (for example, s) generated from an AC source.
It is excited by a constant voltage or a constant current according to inωt).
The self-inductance of each coil increases as the degree of approach or penetration of the magnetic core 22 to each coil increases, and the end of the magnetic core 22 is displaced from one end of one coil to the other end. The voltage generated in the coil (that is, the voltage between both terminals or the voltage between terminals) gradually increases. By arranging a plurality of coils in sequence along the moving direction (displacement direction) of the screw shaft 21, that is, the magnetic core 22, as the position of the magnetic core 22 with respect to each of these coils is displaced, the voltage of each coil is changed. Increasing (or decreasing) changes occur in sequence. As an example, the gradual change in the voltage of the coil, which occurs while the end of the magnetic core 22 is displaced from one end to the other end of a certain coil, becomes a function value change in the range of 90 degrees in the sine or cosine function. It can be compared. In the case of this example, the rotation angle when the take-up reel 14 makes three full rotations is 1080 degrees, so the total rotation angle (= 1080 degrees) of the take-up reel 14 is divided into four equal rotation angle ranges (270 The change in the function value of (degree) can be associated with the change in the function value in the range of 90 degrees in the sine or cosine function of one coil. Therefore, the output voltage of each coil is appropriately combined and added and / or subtracted by the analog arithmetic circuit to obtain the sine and cosine function characteristics according to the amount of change in the relative height between the vehicle body B and the front wheel axle SF1. Two AC output signals sin θ sin ωt and cos θ sin ω each having the indicated amplitude
t can be generated. By detecting the phase components θ of the amplitude functions sin θ and cos θ in the AC output signals of the sine and cosine function characteristics generated in this way by the phase detection circuit (or the amplitude / phase conversion means), the displacement amount is detected absolutely. You can That is, the phase angle θ in the range of 90 degrees in the sine and cosine functions that are the amplitude components of each AC output signal corresponds to the length K of one coil. Therefore, the effective detection range having a length of 4K corresponds to the range of the phase angle θ from 0 degree to 360 degrees. Therefore, by detecting this phase angle θ, it is possible to detect the displacement amount in the range of the length of 4K in an absolute manner. The phase detection circuit may be configured using, for example, the technique disclosed in Japanese Patent Application Laid-Open No. 9-126809 filed by the present applicant.

As described above, the vehicle height detecting devices S are provided corresponding to the front wheel axle SF1 and the rear wheel axle SF2 of the vehicle, respectively.
The relative height between the front wheel axle SF1 and the vehicle body B is detected, and the relative height between the rear wheel axle SF2 and the vehicle body B is detected.
The inclination of the vehicle in the front-rear direction with respect to the road surface can be detected based on the detected difference between the two relative heights.

In the vehicle height detector S shown in FIG. 1, in the linear position detector 2, a magnetic core 22 is screwed into the screw shaft 21 as a conversion mechanism for converting the rotational displacement of the take-up reel 14 into the linear displacement. Although the screw mechanism constructed as above is adopted, a rack and pinion mechanism may be adopted as appropriate. FIG. 2 shows a schematic configuration of a vehicle height detection device having a wire winding function, which is equipped with a linear position detector 2 using such a rack and pinion mechanism. In the vehicle height detection device S shown in FIG. 2, members common to the members of the vehicle height detection device S shown in FIG. 1 are designated by the same reference numerals, and the description thereof is incorporated. The same applies to the vehicle height detection device shown in FIGS. 3 and 4.

In the vehicle height detecting device S shown in FIG. 2, in the winding section 1, both ends of the fixed shaft 13 are fixed and held substantially at the centers of the shaft holding members 12A and 12B of the case 11. The winding spring 15 moves the winding reel 14 clockwise C
Applying tension to W to rotate n is the same as in the above-described device. The linear position detector 2 includes a case 11
Slide plate 16 movably arranged in a linear guide groove 11B provided on the inner peripheral surface of the rod, and a rod-shaped magnetic core 26 provided at the rear end of the slide plate 16.
And a coil portion 23 that is magnetically coupled via the magnetic core 26. The slide plate 16 has a plurality of protrusions (two protrusions in the illustrated example) provided on the lower surface of the tip.
16A is a spiral groove 1 provided on the other end side of the winding ring 14A.
4A2 is engaged. Therefore, the slide plate 16 corresponds to the rack of the rack and pinion mechanism, and the winding ring 14A corresponds to the pinion of the mechanism. Coil part 23
Is a plurality of coil sections (four coil sections LA, LB, L in the illustrated example) that are excited by a predetermined one-phase AC signal.
C, LD) are sequentially arranged along the magnetic core 26.

In the vehicle height detecting device S shown in this example, as an example, the take-up reel 14 is fully set at the position shown in FIG.
Assuming that the other end W2 of the wire is wound around the take-up ring 14A by rotating, the magnetic core 26 is wound along the guide groove 11B of the take-up ring 14A from the predetermined reference position shown by the solid line in FIG. Moves linearly toward the 23 side. As a result, the magnetic core 26 first enters the coil section LA, then enters the coil sections LB and LC in this order, and finally enters the coil section LD. The reference numeral 26 'indicates the position when the magnetic core 26 enters the coil section LD. In the linear position detector 2, the self-inductance of each coil increases as the degree of approach or penetration of the magnetic core 26 to each coil increases, and the self-inductance of each coil increases while the core is displaced from one end to the other end of the coil. The voltage across the coil gradually increases. The output voltage of each coil at this time is appropriately combined and added and / or added by the analog operation circuit.
Alternatively, by subtracting, two AC output signals sin θ sin ωt and cos θ sin ω each having an amplitude showing a sine and cosine function characteristic according to the displacement amount described above.
t can be generated. By measuring the phase components θ of the amplitude functions sin θ and cos θ in the AC output signals of the sine and cosine function characteristics with the phase detection circuit, the displacement amount can be detected absolutely.

FIG. 3 shows an example of a vehicle height detecting device with a wire winding function, which is equipped with an electromagnetic induction type rotational position detecting sensor. FIG. 3A shows a schematic structure of the vehicle height detecting device according to this embodiment. FIG. 3B is a schematic front view showing an example of the physical arrangement relationship between the coil of the rotational position detection sensor and the magnetically responsive member.

In the vehicle height detecting device S shown in FIG. 3A, in the winding portion 1, one end of the fixed shaft 13 is fixedly held by one shaft holding member 12A and the other end thereof is the other shaft holding member 12B. Is held via a bearing B1. The take-up spring 15 applies tension to the take-up reel 14 such that the take-up reel 14 rotates n times in the clockwise direction CW, as in the above-described device. The rotational position detection sensor 3 is configured using, for example, the technique disclosed in Japanese Patent Application Laid-Open No. 2001-235307 related to the present applicant, and in the case 11, the shaft holding member 12B and the side plate of the take-up reel 14 are provided. 14C
A rotor portion 31, a stator portion 32, and the like are provided between and. In the rotor portion 31, the first reduction gear 31A is fixed to the side plate 14C of the winding roller 13, and the second reduction gear 31B meshing with the reduction gear 31A is the rotation shaft 31.
It is fixedly held at C. The rotating shaft 31C is rotatably held by the shaft holding member 12B via a bearing B4.
The gear pitches of the reduction gears 31A and 31B are set so as to reduce the number of rotations of the take-up reel 14 n rotations to one rotation. A magnetic responsive member 31D having a predetermined shape, for example, an eccentric disk shape, is attached to the rotating shaft 31C. The material of the magnetically responsive member 31D may be the same as the material of the magnetic core 22 described above. The stator portion 32 is arranged so as to face the rotor portion 31 in the thrust direction. The stator portion 32 includes four coils 32A, 32B, 32C and 32D as shown in FIG. 3 (B). Each of the coils 32A, ... 32D corresponds to the stator substrate 3 shown in FIG.
They are arranged at a predetermined interval on the 2P, and this interval is, for example, an interval that makes 90 degrees with respect to the rotating shaft 31B. In each of the coils 32A, ... 32D, the coil 32A and the coil 32C arranged at an angle position on the side opposite to the coil 32A by 180 degrees are coils for sine function output, and the coil 32B and the coils 32B and 18
The coil 32D arranged at an angular position on the opposite side of 0 degree is a coil for outputting a cosine function. Each coil 32A, ...
32D are iron cores (magnetic cores) 33A and 33, respectively.
It is wound around B, 33C and 33D, and the magnetic flux passing through the coil is directed in the axial direction of the rotating shaft 31C. Each coil 32
A gap is formed between the end faces of the iron cores 33A, ... 33D of A, ..., 32D and the surface of the magnetically responsive member 31D of the rotor portion 31, and the magnetically responsive member 31D rotates in a non-contact manner with respect to the stator portion 32. The relative arrangement of the rotor portion 31 and the stator portion 32 is determined so that the distance of this gap is kept constant.

In the vehicle height detecting device S shown in this example, as an example, the take-up reel 14 makes three full turns in the clockwise direction CW at the position shown in FIG.
If it is wound around A, the number of rotations (= 3 rotations) of the winding reel 14 is reduced to one rotation by the reduction gears 31A and 31B of the rotor unit 31. As a result, the magnetic responsive member 31D together with the rotating shaft 31C is moved to the stator 32
It makes one rotation without contact. Rotating shaft 31C at this time
The rotation angle of corresponds to the amount of change in the relative height between the vehicle body B and the front axle SF1.

In the rotational position detecting sensor 3, the coils 32A, ... 32D are excited by a constant voltage or constant current by a predetermined one-phase AC signal (for example, sinωt) generated from an AC source. When the magnetically responsive member 31D makes one non-contact rotation with respect to the stator portion 32, because of the predetermined shape of the magnetically responsive member 31D of the rotor portion 31, for example, the eccentric disk shape, the magnetically responsive member 31D is separated from the magnetically responsive member 31D via the air gap. The area of the end faces of the coil cores 33A, ..., 33D facing each other changes depending on the rotational position. The magnetic flux amount penetrating the coils 32A, ... 32D through the iron cores 33A, ... 33D changes due to the change in the air gap area facing the end faces of the coil iron cores 33A ,.
Accordingly, the self-inductance of the coils 32A, ... 32D changes. This change in inductance is
It is also the impedance change of 2A, ..., 32D. Therefore, the inter-terminal voltage of each coil 32A, ..., 32D shows a magnitude corresponding to each impedance corresponding to the rotation angle θ of the rotation shaft 31C. As a result, the impedance of each coil in one coil pair changes differentially,
Therefore, the increase / decrease in the voltage between the terminals of each coil exhibits a differential characteristic. Therefore, the difference in the voltage between the terminals of each coil is extracted for each coil pair, and two AC output signals sin θ cos ωt and cos θ having amplitudes showing sine and cosine function characteristics in the analog arithmetic circuit, respectively.
sin ωt is generated for each coil pair. Then, the AC output signals sinθcosωt and cosθsin of the sine and cosine function characteristics output from the analog arithmetic circuit.
By measuring the phase components θ of the amplitude functions sin θ and cos θ at ωt by the phase detection circuit (or the amplitude / phase conversion means), the rotational position of the rotary shaft 31C can be detected absolutely.

The stator substrate 32P may be appropriately equipped with an AC generation source, an arithmetic circuit, a phase detection circuit, and the like. When the AC generation source and the phase detection circuit are composed of digital circuits, they can be integrated into an LSI, so that the size is reduced, and these circuits can be integrally mounted on the stator substrate 32P. In this case, the wiring C connected to the stator substrate 32P is drawn out through the shaft holding member 12B and connected to the control unit of the axle adjusting device.

FIG. 3 shows a vehicle height detecting device S in which the electromagnetic induction type rotational position detecting sensor 3 detects the rotational angle of the rotating shaft 31C within one rotational range. Alternatively, the rotation speed of the take-up reel 14 may be detected by a multi-rotation sensor. FIG. 4 shows an example of a schematic configuration of a vehicle height detection device with a wire winding function, which includes the multi-rotation sensor 4.

In the vehicle height detecting device S shown in FIG. 4, in the winding portion 1, one end of the fixed shaft 13 is fixedly held by one shaft holding member 12A and the other end thereof is the other shaft holding member 1.
2B is held via a bearing B1. Winding spring 1
5 applies tension to the take-up reel 14 such that it rotates n times in the clockwise direction CW, as in the above-described device. The rotation transmission member 5 is fixed to the side plate 14C of the take-up reel 14. The rotation transmitting member 5 is rotatably held by the shaft holding member 14B of the winding unit 1 via a bearing B5, and the multi-rotation sensor 4 is provided at an end portion that extends through the shaft holding member 14B to the outside. Sensor shaft 4A is connected.
As the multi-rotation sensor 4, for example, an optical or magnetic rotary encoder or the like can be appropriately adopted.

In the vehicle height detecting device S shown in this example, as an example, the take-up reel 14 is fully rotated three times in the clockwise direction CW at the position shown in FIG.
If 2 is taken up, the multi-rotation sensor 4 detects the number of rotations (= 3 rotations) of the rotation transmitting member 5 that rotates together with the take-up reel 14. The rotation speed of the take-up reel 14 at this time corresponds to the amount of change in the relative height between the vehicle body B and the front wheel axle SF1.

In the present embodiment, the winding section 1 and the linear position detector 2 and the rotational position detecting sensors 3 and 4 related thereto are provided.
Although the vehicle height detecting device in which the vehicle body B is disposed on the vehicle body B is shown, the invention is not limited to this, and the winding portion 1 and the linear position detector 2 and the rotational position detecting sensors 3 and 4 related thereto are provided on the vehicle body B and You may arrange | position on each axle SF1, SF2. Instead of the winding spring 15, an arbitrary motor or the like may be appropriately used to apply tension to the winding ring 14A of the winding reel 14 in the winding direction of the wire W. In addition, the wire W that moves in and out of the winding ring 14A of the winding reel 14 based on the rotation amount of the winding reel 14.
However, the present invention is not limited to this, and the wire displacement may be detected by using the technique disclosed in Japanese Patent Application Laid-Open No. 10-153402 filed by the present applicant. As an example, outside the winding unit 1, magnetic response members having magnetic response characteristics are arranged on the wire at predetermined intervals, and a winding portion (coil portion) is arranged around the wire portion including the magnetic response member. By detecting the relative displacement of the wire portion with respect to the winding portion, it is possible to detect the change in the relative height between the vehicle body and the axle. Further, vehicle height detection devices are provided at both ends of a front wheel axle or a rear wheel axle of a vehicle, respectively, and the relative height between the axle and the vehicle body is detected at one end side of the axle and the other end side of the axle is detected. The relative height between the axle and the vehicle body may be detected, and the inclination of the vehicle in the left-right direction with respect to the road surface may be detected based on the difference between the detected relative heights.

[0025]

As described above, the vehicle height detecting device according to the present invention has an excellent effect that the degree of freedom of the mounting position with respect to the vehicle can be improved while having a small size and a simple structure.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a vehicle height detecting device according to the present invention and showing an example of a vehicle height detecting device with a wire winding function, which is equipped with an electromagnetic induction type linear position detector.

FIG. 2 is a schematic configuration diagram showing another example of a vehicle height detection device having a wire winding function, which is equipped with an electromagnetic induction type linear position detector.

FIG. 3A is a schematic cross-sectional view showing an example of a vehicle height detection device with a wire winding function including an electromagnetic induction type rotational position detection sensor, and FIG. 3B is a coil of the rotational position detection sensor and a magnetic response member. 2 is a schematic front view showing an example of the physical arrangement relationship with

FIG. 4 is a schematic configuration diagram showing an example of a vehicle height detection device with a wire winding function including a multi-rotation detection sensor,

FIG. 5 is a perspective view showing an arrangement example in which the vehicle height detection device according to the present invention is arranged on the vehicle body of an automobile.

[Explanation of symbols]

1 winding section 2 Linear position detector 3 Rotation position detection sensor 4 Multi-rotation sensor 14 Take-up reel 15 Winding spring B body SF1 front wheel axle SF2 rear wheel axle W wire

Claims (4)

[Claims] 1. A wire, one end of which is coupled to one of a vehicle axle and a vehicle body, and a wire which is disposed on the other of the axle and the vehicle body, and the other end of which is coupled to a winding shaft to form the wire. A winding means that can be wound around a winding shaft, and tension is applied to the winding shaft of the winding means in a winding direction of the wire, whereby a relative height between the axle and the vehicle body is increased. A tension applying means for allowing the wire to be wound around the winding shaft or to be paid out from the winding shaft according to a change in the height, and a detecting means for detecting a displacement of the wire moving in and out of the winding shaft. A vehicle height detecting device for detecting a relative height between the axle and the vehicle body based on the displacement of the wire detected by the detecting means. 2. The vehicle height detection device according to claim 1, wherein the detection unit includes a rotational position detection unit that detects a rotational displacement of the winding shaft. 3. The detecting means includes a mechanism for converting the rotational displacement of the winding shaft into a linear displacement, and a linear position detecting means for detecting the linear displacement converted by the mechanism. Item 1. The vehicle height detection device according to item 1. 4. The vehicle height detection device according to claim 1 is provided corresponding to a front wheel axle and a rear wheel axle of the vehicle, respectively, to detect a relative height between the front wheel axle and the vehicle body, and to detect the rear wheel axle. And a vehicle body, and detects a relative height between the vehicle and a vehicle body, and detects a tilt of the vehicle in a front-rear direction with respect to a road surface based on a difference between the detected relative heights.