JP3959303B2 - Vehicle height detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle height detection device that is disposed in a vehicle such as an automobile and detects a relative height between a vehicle body and an axle.
[0002]
[Prior art]
In vehicles such as automobiles, when the rear part of the vehicle body sinks with respect to the rear wheel axle due to luggage mounted on the rear loading platform or trunk of the vehicle body, the front part of the vehicle body rises with respect to the front wheel axle, and the irradiation direction of the headlamps May turn upward and give glare to oncoming vehicles. In order to solve such a problem, conventionally, various optical axis adjusting devices for correcting the irradiation direction of the headlamp according to the change in the posture of the vehicle body have been proposed. In this type of device, generally, a change in the height of the vehicle body relative to each axle is detected by vehicle height sensors arranged on the rear wheel axle and the front wheel axle of the vehicle, and a change in the tilt angle of the front and rear of the vehicle body is detected based on the detection signal. It is determined and configured to control the irradiation direction of the headlamp according to this change.
[0003]
[Problems to be solved by the invention]
In vehicles such as automobiles, suspensions are arranged between the vehicle body and the front and rear axles, so when installing a vehicle height sensor on each axle, the sensor installation space and location There was a problem that was limited.
[0004]
The present invention has been made in view of the above points, and intends to provide a vehicle height detection device with a wire winding function that has a small and simple structure and can improve the degree of freedom of the mounting position with respect to the vehicle. Is.
[0005]
[Means for Solving the Problems]
  A vehicle height detection device according to the present invention includes a wire having one end coupled to one of a vehicle axle and a vehicle body and the other of the axle or vehicle body, and the other end of the wire is coupled to a winding shaft. Winding means capable of winding the wire around the winding shaft, and tension is applied in the winding direction to the winding shaft of the winding means, whereby the axle and the vehicle body And a tension applying means for allowing the wire to be wound on or taken out of the winding shaft in accordance with a change in relative height of the wire, and displacement of the wire entering and exiting the winding shaftA magnetically responsive displacement member that is displaced in conjunction with the coil member, and coil means that generates an inductance change according to the displacement of the displacement member.Detecting means, and the detecting meansAn output signal corresponding to the inductance change is generated from the coil means, and the output signalThe relative height between the axle and the vehicle body is detected based on the above. According to this, in accordance with a change in the relative height between the axle and the vehicle body, the displacement of the wire that is wound on or taken out from the winding shaft of the winding means and moves in and out of the winding shaft is By detecting by the detection means, the relative height between the axle and the vehicle body can be detected. Further, when 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, so that the degree of freedom of the mounting position with respect to the vehicle can be improved. In addition, since the wire, the winding means, the tension applying means, and the detecting means can be used, a small and simple structure can be achieved.Further, the detection means includes a magnetically responsive displacement member that is displaced in conjunction with the displacement of the wire entering and exiting the winding shaft, and a coil means that generates an inductance change according to the displacement of the displacement member, Since it is the structure which produces the output signal according to the said inductance change from a coil means, it can be set as the structure suitable for absolute position detection although it is simple.
[0006]
DETAILED DESCRIPTION OF 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 detection device according to the present invention, and shows a schematic configuration of a vehicle height detection device S having a wire winding function provided with an electromagnetic induction type linear position detector.
In FIG. 1, the vehicle height detection device S includes a wire W, a winding unit 1 for winding a 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-based wire is used as appropriate. One end of the wire W is coupled to the axle of the vehicle as will be described later.
[0007]
The winding unit 1 has a fixed shaft 13 at substantially the center of shaft holding members 12A and 12B fixed to one end and the other end of a cylindrical case 11. One end of the fixed shaft 13 is fixedly held by one shaft holding member 12A, and the other end is held by the other shaft holding member 12B via a bearing B1. In the case 11, a take-up reel 14 for taking up the other end (hereinafter referred to as the other end of the wire) W2 of the wire W and a take-up spring 15 made of a spring-type plate spring are arranged. The take-up reel 14 includes a take-up ring 14A and a pair of side plates 14B and 14C fixed to both ends of the take-up ring 14A. The side plates 14B and 14C respectively have bearings B2 and B3 on a fixed shaft 13. It can be rotatably mounted via. A spiral winding groove 14A1 is formed on one end side (in the illustrated example, the right end side) of the outer circumferential surface of the winding ring 14A. A part of the winding groove 14A1 is provided in 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 passes through the winding ring 14A and is locked to the inner surface of the winding ring 14A. The winding spring 15 is disposed between the pair of side plates 14B and 14C in the winding ring 14A, and one end 15A is attached to the fixed shaft 13 and the other end 15B is attached to the winding ring 14A. As a result, for example, the winding reel 14 is rotated n times clockwise CW, and a tension (winding force) for winding the wire other end W2 around the winding ring 14A is applied to the winding reel 14.
[0008]
The linear position detector 2 is configured using, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 2001-141410 related to the present applicant, and is disposed on the shaft holding member 12B side of the winding unit 1. 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 that is magnetically coupled to 22. The screw shaft 21 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 material such as iron, a conductive material such as copper, or a combination of a magnetic material and a conductive material. The magnetic core 22 has, on the inner peripheral surface of the coil portion 23, a ridge 22 </ b> A provided on the outer peripheral surface so as to move linearly relative to the screw shaft 21 when the screw shaft 21 rotates together with the take-up reel 14. The groove is engaged with a concave linear guide groove 23A. The coil unit 23 is configured so that a plurality of coil sections (four coil sections LA, LB, LC, and LD in the illustrated example) excited by a predetermined one-phase AC signal are connected to the screw shaft 21 within the moving range of the magnetic core 22. It is arranged sequentially. 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.
[0009]
When the vehicle height detection device S is used as, for example, a vehicle height sensor of an optical axis adjustment device, as shown in FIG. As an example, the two vehicle height detection devices S may be disposed close to a control unit of an optical axis adjustment 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 It is coupled to the axle SF1. The other remaining 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 connected via a roller R, for example. Are coupled to the axle SF2.
[0010]
In the vehicle height detection device S having such a configuration, since the tension is always applied to the take-up reel 14 by the take-up spring 15, the rear part of the vehicle body B sinks with respect to the rear wheel axle SF2 in FIG. When the front portion of the vehicle body B is lifted 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. When the front portion of the vehicle body B sinks with respect to 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 14A1 of the take-up ring 14A. The other end W2 of the wire that has been wound up is fed out. Thus, the amount of rotation that the winding reel 14 rotates when winding or unwinding the wire other end W2 corresponds to the amount of change (displacement) in the relative height between the vehicle body B and the front wheel axle SF1. . As an example, when the take-up reel 14 is rotated three times at the position shown in FIG. 1 and the other wire W2 is wound around the take-up ring 14A, the magnetic core 22 is a predetermined line indicated by a solid line in FIG. Is moved linearly from the reference position toward the tip side of the screw shaft 21. As a result, the magnetic core 22 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 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 a position when the magnetic core 22 enters the coil section LD.
[0011]
In the linear position detector 2, each coil section LA, LB, LC, LD (hereinafter, each coil section LA, LB, LC, LD is simply referred to as “coil”) is a predetermined 1 generated from an AC generation source. It is excited with a constant voltage or a constant current by a phase AC signal (for example, sin ωt). As the degree of proximity or penetration of the magnetic core 22 with respect to each coil increases, the self-inductance of each coil increases, and the end of the magnetic core 22 is displaced from one end to the other end of one coil. The voltage generated in the coil (that is, the voltage between both terminals or the voltage between terminals) gradually increases. The plurality of coils are sequentially arranged along the moving direction (displacement direction) of the screw shaft 21, that is, the magnetic core 22, so that the position of the magnetic core 22 with respect to each of these coils is displaced, so that the voltage of each coil is changed. Increasing (or decreasing) changes occur sequentially. As an example, a gradual change in the voltage of the coil that occurs while the end of the magnetic core 22 is displaced from one end of the coil to the other end is a function value change in the range of 90 degrees in the sine or cosine function. 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 rotation angle range (270) is obtained by dividing the total rotation angle (= 1080 degrees) of the take-up reel 14 into four equal parts. Function value change in degrees) can correspond to a function value change in the range of 90 degrees in the sine or cosine function of one coil.
Therefore, the sine and cosine function characteristics corresponding to the amount of change in the relative height between the vehicle body B and the front wheel axle SF1 are obtained by appropriately combining the output voltages of the coils and adding and / or subtracting them with an analog arithmetic circuit. Two AC output signals sin θ sin ωt and cos θ sin ωt each having the indicated amplitude can be generated. By measuring the phase component θ of the amplitude functions sin θ and cos θ in the AC output signal of the sine and cosine function characteristics generated in this way by a phase detection circuit (or amplitude phase conversion means), the displacement amount is detected in absolute. Can do. That is, the phase angle θ in the range of 90 degrees in the sine and cosine functions, which 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 a range from 0 degree to 360 degrees of the phase angle θ. Therefore, by detecting this phase angle θ, the displacement amount in the 4K length range can be detected in absolute. For example, the phase detection circuit may be configured using the technique disclosed in Japanese Patent Laid-Open No. 9-126809 related to the present applicant.
[0012]
Thus, the vehicle height detection device S is provided corresponding to the front wheel axle SF1 and the rear wheel axle SF2 of the vehicle, respectively, and detects the relative height between the front wheel axle SF1 and the vehicle body B, and the rear wheel axle SF2 and the vehicle body. The relative height with respect to B can be detected, and the inclination in the front-rear direction with respect to the road surface of the vehicle can be detected based on the difference between the detected relative heights.
[0013]
In the vehicle height detection device S shown in FIG. 1, in the linear position detector 2, a magnetic core 22 is screwed into a screw shaft 21 as a conversion mechanism that converts rotational displacement of the take-up reel 14 into linear displacement. Although a screw mechanism is employed, a rack and pinion mechanism may be employed as appropriate. FIG. 2 shows a schematic configuration of a vehicle height detection device with a wire winding function that includes a linear position detector 2 using such a rack and pinion mechanism.
In addition, in the vehicle height detection apparatus S shown in FIG. 2, the same code | symbol is attached | subjected to the member which is common in the member of the vehicle height detection apparatus S shown in FIG. 1, and the description is used. The same applies to the vehicle height detection apparatus shown in FIGS.
[0014]
In the vehicle height detection device S shown in FIG. 2, both ends of the fixed shaft 13 are fixed and held at substantially the center of the shaft holding members 12 </ b> A and 12 </ b> B of the case 11 in the winding unit 1. The tension is applied to the take-up reel 14 so that the take-up reel 15 is rotated n times in the clockwise direction CW as in the above-described apparatus. The linear position detector 2 includes a slide plate 16 that is movably disposed in a linear guide groove 11B provided on the inner peripheral surface of the case 11, and a rod-like magnetic member provided at the rear end of the slide plate 16. A body core 26 and a coil portion 23 that is magnetically coupled via the magnetic core 26. In the slide plate 16, a plurality of protrusions (two protrusions in the illustrated example) 16A projecting from the lower surface of the front end are engaged with a spiral groove 14A2 provided on the other end side of the winding ring 14A. 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. The coil unit 23 is formed by sequentially arranging a plurality of coil sections (four coil sections LA, LB, LC, and LD in the illustrated example) excited by a predetermined one-phase AC signal along the magnetic core 26.
[0015]
In the vehicle height detection device S shown in this example, as an example, if the take-up reel 14 is rotated three times at the position shown in FIG. 2 and the other wire W2 is wound around the take-up ring 14A, The body core 26 linearly moves from the predetermined reference position shown by the solid line in FIG. 2 toward the coil portion 23 side along the guide groove 11B of the winding ring 14A. 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. Reference numeral 26 ′ indicates a 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 proximity or penetration of the magnetic core 26 with respect to each coil increases, and the core is displaced while the core is displaced from one end to the other end. The voltage across the coil gradually increases. Two AC output signals each having an amplitude indicating a sine and cosine function characteristic according to the amount of displacement described above by adding and / or subtracting the output voltages of the coils at this time in an appropriate combination with an analog arithmetic circuit. sin θ sin ωt and cos θ sin ωt can be generated. By measuring the phase component θ of the amplitude functions sin θ and cos θ in the AC output signal of the sine and cosine function characteristics with the phase detection circuit, the displacement amount can be detected in absolute.
[0016]
FIG. 3 shows an example of a vehicle height detection device with a wire winding function equipped with an electromagnetic induction type rotational position detection sensor. FIG. 3A is a cross-sectional view showing a schematic configuration of the vehicle height detection device according to this example. FIG. 4B is a schematic front view showing an example of a physical arrangement relationship between the coil of the rotational position detection sensor and the magnetic response member.
[0017]
In the vehicle height detection device S shown in FIG. 3A, in the winding unit 1, the fixed shaft 13 is fixedly held at one end by one shaft holding member 12A, and the other end at the other shaft holding member 12B by a bearing B1. It is held through. It is the same as the above-described device that the take-up spring 15 applies tension to the take-up reel 14 so as to rotate n in the clockwise direction CW.
The rotational position detection sensor 3 is configured by using, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 2001-235307 related to the present applicant, and in the case 11, the side plate of the shaft holding member 12 </ b> B and the take-up reel 14. The rotor part 31, the stator part 32, etc. are comprised between 14C. 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 that meshes with the reduction gear 31A is fixedly held on the rotating shaft 31C. 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 times to one rotation. A magnetic response member 31D having a predetermined shape, for example, an eccentric disk shape, is attached to the rotation shaft 31C. The material of the magnetic response member 31D may be the same material as that of the magnetic core 22 described above. The stator portion 32 is arranged in such a manner as to face the rotor portion 31 in the thrust direction.
As shown in FIG. 3B, the stator portion 32 includes four coils 32A, 32B, 32C, and 32D. The coils 32A,... 32D are spaced apart from each other at a predetermined interval on the stator substrate 32P shown in FIG. (A), and this interval is, for example, an interval of 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 angular position opposite to the coil 32A by 180 degrees are coils for sine function output, and are 180 degrees opposite to the coil 32B and the coil 32B. The coil 32D disposed at the angular position is a coil for outputting a cosine function. Each of the coils 32A,... 32D is wound around iron cores (magnetic cores) 33A, 33B, 33C, 33D, and the magnetic flux passing through the coils is directed in the axial direction of the rotating shaft 31C. A gap is formed between the end surfaces of the iron cores 33A, ... 33D of the coils 32A, ... 32D and the surface of the magnetic response member 31D of the rotor part 31, and the magnetic response member 31D rotates without contact with the stator part 32. To do. The relative arrangement of the rotor portion 31 and the stator portion 32 is determined so that the gap distance is kept constant.
[0018]
In the vehicle height detection device S shown in this example, as an example, the take-up reel 14 is rotated three times in the clockwise direction CW at the position shown in FIG. 3 and the other end W2 is wound around the take-up ring 14A. Then, the rotation speed (= 3 rotations) of the take-up reel 14 is reduced to one rotation by the reduction gears 31A and 31B of the rotor portion 31. As a result, the magnetic response member 31D rotates together with the rotating shaft 31C one rotation without contact with the stator portion 32. The rotation angle of the rotation shaft 31C at this time corresponds to the amount of change in the relative height between the vehicle body B and the front wheel axle SF1.
[0019]
In the rotational position detection sensor 3, each of the coils 32A,... 32D is excited with a constant voltage or a constant current by a predetermined one-phase AC signal (for example, sin ωt) generated from an AC generation source. When the magnetic response member 31D makes one rotation without contact with the stator portion 32, because of a predetermined shape of the magnetic response member 31D of the rotor portion 31, for example, an eccentric disk shape, The areas of the end faces of the facing coil cores 33A,... 33D vary depending on the rotational position. The amount of magnetic flux passing through the coils 32A,... 32D through the iron cores 33A,... 33D is changed by the change in the facing gap area with the end surfaces of the coil cores 33A,. The self-inductance of the coils 32A, ... 32D changes. This change in inductance is also a change in impedance of each coil 32A,... 32D. Therefore, the voltage between the terminals of each of the coils 32A,... 32D shows a magnitude corresponding to each impedance corresponding to the rotation angle θ of the rotating shaft 31C. As a result, the impedance of each coil in one coil pair changes differentially, so that the increase / decrease change in the voltage between terminals of each coil exhibits differential characteristics. Therefore, the difference in voltage between terminals of each coil is extracted for each coil pair, and two AC output signals sin θ cos ωt and cos θ sin ωt having amplitudes indicating sine and cosine function characteristics are generated by the analog arithmetic circuit for each coil pair. . Then, the phase components θ of the amplitude functions sin θ and cos θ in the AC output signals sin θ cos ωt and cos θ sin ωt output from the analog arithmetic circuit are measured by the phase detection circuit (or amplitude phase conversion means). The rotational position of the shaft 31C can be detected by absolute.
[0020]
Note that an AC source, an arithmetic circuit, a phase detection circuit, and the like may be appropriately mounted on the stator substrate 32P. When the AC generation source and the phase detection circuit are constituted by digital circuits, they can be made into LSIs, so that the size can be 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 to the outside via the shaft holding member 12B and connected to the control unit of the axle adjusting device.
[0021]
In FIG. 3, the vehicle height detection device S that detects the rotation angle within the rotation range of the rotation shaft 31 </ b> C by the electromagnetic induction type rotation position detection sensor 3 is shown, but instead of this rotation position detection sensor 3, The number of rotations 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 that includes the multi-rotation sensor 4.
[0022]
In the vehicle height detection device S shown in FIG. 4, in the winding unit 1, one end of the fixed shaft 13 is fixedly held by one shaft holding member 12 </ b> A and the other end is fixed to the other shaft holding member 12 </ b> B via a bearing B <b> 1. It will be held. It is the same as the above-described device that the take-up spring 15 applies tension to the take-up reel 14 so as to rotate n in the clockwise direction CW. The rotation transmission member 5 is fixed to the side plate 14 </ b> C of the take-up reel 14. The rotation transmitting member 5 is rotatably held by a 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. The sensor shaft 4A is connected. As the multi-rotation sensor 4, for example, an optical or magnetic rotary encoder can be appropriately employed.
[0023]
In the vehicle height detection device S shown in this example, as an example, the take-up reel 14 is rotated three times in the clockwise direction CW at the position shown in FIG. 4 and the other end W2 is taken up on the take-up ring 14A. Then, the number of rotations (= 3 rotations) of the rotation transmitting member 5 that rotates together with the take-up reel 14 is detected by the multi-rotation sensor 4. The rotational 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.
[0024]
In the present embodiment, the vehicle height detection device in which the winding unit 1 and the linear position detector 2 and the rotational position detection sensors 3 and 4 related to the winding unit 1 are arranged in the vehicle body B is shown, but the present invention is not limited to this. The winding unit 1, the linear position detector 2 and the rotational position detection sensors 3 and 4 associated therewith may be arranged on the vehicle body B and the axles SF1 and SF2. Further, instead of the take-up spring 15, an arbitrary motor or the like may be used as appropriate so that tension is applied to the take-up ring 14A of the take-up reel 14 in the direction in which the wire W is taken up. Further, the displacement of the wire W entering and exiting the take-up ring 14A of the take-up reel 14 is detected based on the amount of rotation of the take-up reel 14. However, the present invention is not limited to this. You may make it detect the displacement of a wire using the technique shown by Kaihei 10-153402. As an example, on the outside of the winding unit 1, magnetic response members having magnetic response characteristics are arranged at predetermined intervals on the wire, and a winding part (coil part) is arranged around the wire part 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 a change in the relative height between the vehicle body and the axle. Further, vehicle height detection devices are provided at both ends of the front wheel axle or the rear wheel axle of the vehicle, respectively, and the relative height between the axle and the vehicle body is detected on one end side of the axle, and the other end side of the axle is The relative height between the axle and the vehicle body may be detected, and the left-right inclination with respect to the road surface of the vehicle may be detected based on the difference between the detected relative heights.
[0025]
【The invention's effect】
As described above, according to the vehicle height detection device of the present invention, there is an excellent effect that the degree of freedom of the mounting position with respect to the vehicle can be improved while having a small and simple structure.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of a vehicle height detection device according to the present invention, showing an example of a vehicle height detection device with a wire hoisting function 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 with a wire winding function that includes an electromagnetic induction type linear position detector.
3A is a schematic cross-sectional view showing an example of a vehicle height detection device with a wire winding function that includes an electromagnetic induction type rotational position detection sensor, and FIG. 3B is a coil and a magnetic response member of the rotational position detection sensor; The front schematic diagram which shows an example of physical arrangement | positioning relationship.
FIG. 4 is a schematic configuration diagram showing an example of a vehicle height detection device with a wire winding function provided with 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 body of an automobile.
[Explanation of symbols]
1 Winding part
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 axle
W wire

Claims (4)

A wire having one end coupled to one of the vehicle axle or the vehicle body;
Winding means arranged on the other side of the axle or the vehicle body, the other end of the wire being coupled to a winding shaft and winding the wire around the winding shaft;
A tension is applied to the winding shaft of the winding means in the winding direction so that the wire is wound around the winding shaft in accordance with a change in the relative height between the axle and the vehicle body. Tensioning means to be taken out or unwound from there;
A magnetic responsive displacement member that displaces in conjunction with the displacement of the wire that enters and exits the winding shaft, and a detection means that includes coil means that generates an inductance change in accordance with the displacement of the displacement member. An output signal corresponding to the inductance change is generated from the coil means of the detection means , and a relative height between the axle and the vehicle body is detected based on the output signal . The detecting device, vehicle height detection device according to claim 1, characterized in that the displacement member in response to rotational displacement of the take-up shaft as the rotational position detecting means for rotational displacement. It said detecting means includes a mechanism for converting the rotational displacement of the take-up shaft to the linear displacement of the displacement member, and characterized by a linear position detecting means for detecting a linear displacement of the displacement member which has been converted by the mechanism The vehicle height detection device according to claim 1.   The vehicle height detection device according to claim 1 is provided corresponding to the front wheel axle and the rear wheel axle of the vehicle, respectively, and detects the relative height between the front wheel axle and the vehicle body, and the relative between the rear wheel axle and the vehicle body. A vehicle inclination detection device that detects a target height and detects an inclination in a front-rear direction with respect to a road surface of the vehicle based on a difference between the detected relative heights.

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