JP3338721B2 - Load control device in vehicle inspection system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle inspection system in which a vehicle such as an automobile or a motorcycle is mounted on a pair of receiving rollers which rotate and performs various inspections of the vehicle. The present invention relates to a load control device that controls a braking force applied to a supporting roller as a load.

[0002]

2. Description of the Related Art As a system for inspecting the running performance of a vehicle such as an automobile and a motorcycle, a vehicle wheel is mounted on a pair of rotationally driven receiving rollers, and the wheels are rotated via the rollers. A system for measuring various driving performances is generally used.

In such a vehicle inspection system, as a means for changing a load applied to a supporting roller, a method of applying a braking force to a rotating body directly connected to the roller to change the braking force, an inertial mass of the rotating body ( A method of changing the moment of inertia) is provided.

As one of means for changing the moment of inertia of the rotating body, Japanese Utility Model Publication No. 5-204040 (Japanese Utility Model Application
No. 3-135143) is provided. In this method, a cylindrical rotating cylinder is fixedly mounted on a rotating shaft connected to a receiving roller or the like, and an electromagnet formed by winding a coil around a disk-shaped body is disposed inside the rotating cylinder. A magnetic pole portion on the outer periphery of the electromagnet is opposed to the rotating cylinder with a small gap, and the inner peripheral portion is rotatably supported on a fixed support member via a slip ring to supply electricity to the winding. Conduction is possible.

[0005] When the electromagnet is energized from the fixed support member side, the electromagnet is attracted to the rotary cylinder by the excitation operation of the electromagnet, and the electromagnet rotates integrally with the rotary cylinder. Accordingly, the moment of inertia of the rotary cylinder increases by the amount of the electromagnet, and the load applied to the receiving roller increases. In order to reduce the load, energization to the electromagnet is cut off, and the electromagnet section and the rotary cylinder section are separated to reduce the moment of inertia of the rotating section.

[0006]

Problems to be Solved by the Invention
In the conventional system as shown in the figure, the rotating cylinder portion is combined with an electromagnet having a predetermined inertial mass to connect / disconnect current to the electromagnet or change the amount of current to reduce the moment of inertia of the rotating portion. Since it is changed, a considerable amount of electricity is consumed, which is disadvantageous in energy saving.

Further, since the electric circuit and the electromagnet are formed, the structure becomes complicated, the cost of the device is increased, and the size of the device is also increased.

Accordingly, an object of the present invention is to make it possible to control the load of a rotating part such as a receiving roller in a vehicle inspection system without consuming energy such as electricity, to have a simple structure and to install the apparatus. It is an object of the present invention to provide a small and compact load control device with reduced costs.

[0009]

According to the present invention, in order to solve the above-mentioned problems, a disk-shaped rotating plate made of an electric conductor is fixed to a fixed shaft interlocked with a receiving roller, and the shaft of the rotating shaft is fixed. A permanent magnet fixed to a supporting member movable in a direction is opposed to the rotating plate with a small gap, and a rotating body is positioned in a magnetic field of the permanent magnet. The gap is adjusted by an adjusting mechanism that moves the gap in the axial direction of the rotating body.

A second feature is that a plurality of pairs of the rotating plate and the permanent magnet are arranged in the axial direction of the rotating shaft.

Further, a third feature is that a plurality of poles of the permanent magnet are alternately arranged at equal intervals in the circumferential direction of the support member.

[0012]

When the rotating plate is rotated within the magnetic flux of the permanent magnet which is connected to and supported by the receiving roller made of an electric conductor, the rotating plate cuts off the magnetic flux, thereby generating an eddy current in the rotating plate. When the eddy current cuts the magnetic force line from the permanent magnet at right angles, an electromagnetic force acts on the rotating plate in a direction opposite to the rotating direction of the rotating shaft, and this electromagnetic force becomes a braking force of the rotating shaft, that is, a load resistance.

Therefore, unlike the prior art, no electric energy is used, so that energy can be saved and installation and operating costs can be reduced by simplifying the apparatus. The adjustment of the electromagnetic force, that is, the load resistance, can be performed by a simple method of changing the gap between the permanent magnet and the rotating plate by the adjusting member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just

FIG. 1 is a plan view of a control device for a load resistance applied to a receiving roller in a vehicle inspection system according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. III −
FIG. 3 is a sectional view taken along line III.

In FIG. 1, reference numeral 1 denotes a supporting roller on which wheels of a vehicle such as an automobile or a motorcycle are mounted, 3 denotes a rotating shaft interlocked to the roller 1, and 2 denotes a frame. On the rotating shaft 3, three disk-shaped rotating plates 4 made of a non-magnetic and electric conductor are fixedly mounted at equal intervals in the axial direction.

Reference numeral 5 denotes a support member, and reference numeral 6 denotes a permanent magnet fixed to the support member 5. The support member 5 and the permanent magnet 6
The same number as the rotating plates, and permanent magnets 6 are provided on the surface of each rotating plate 4 with a gap C therebetween. Further, the support members 5 and the permanent magnets 6 are fixed to a connecting rod 7 provided to penetrate between the support members 5, and three pairs can be moved integrally.

As shown in FIG. 3, the permanent magnet 6 has N poles and S poles alternately arranged at equal intervals in the circumferential direction of the support member 5, and each pole portion is formed on the surface of the rotary plate 4. It is opposed to.

Reference numeral 9 denotes an adjusting screw, as shown in FIG.
Both ends are rotatably supported by brackets 8, 8 arranged side by side on the frame 2, and a screw portion 9 a formed at the center is screwed to the support member 5 of the permanent magnet 6. Therefore, by rotating the adjusting screw 9, the support member 5 and the permanent magnet 6 can be integrally moved in the axial direction of the rotating shaft 3.

Reference numeral 12 denotes a bearing that supports the rotating shaft 3 on the supporting roller side, 13 denotes a bearing stand for the bearing, and 11 denotes a bearing that supports the rotating shaft 3 on the non-receiving roller side. A guide rod 10 is provided between the two brackets 8 and 8 so as to extend through the respective support members 5. The guide rod 10 guides the support member 5 and the permanent magnet 6 to the rotation shaft 3. It moves in the axial direction.

The operation of applying the load resistance to the rotation of the receiving roller 1 during the operation of the vehicle inspection system configured as described above will be described. The wheels of the vehicle rotate, and the receiving roller 1 and the rotating shaft 3 fixed thereto rotate.

The rotating plate 4 made of an electric conductor fixed to the rotating shaft 3 is in the magnetic flux generated from the permanent magnet 6 opposed to the rotating plate 4 with a small gap C therebetween.
When the rotor rotates in this magnetic flux, the rotating plate 4 cuts off the magnetic flux, so that an eddy current is generated in the rotating plate 4.

The eddy current cuts the line of magnetic force generated from the permanent magnet 6 at a right angle, so that an electromagnetic force acts on the rotating plate 4 in a direction opposite to the rotating direction of the rotating shaft 3. Therefore, this electromagnetic force becomes a braking force, that is, a load resistance, of the receiving roller 1 and the rotating shaft 3, and the power of the rotating shaft 3 can be absorbed.

In order to change the load resistance, the adjusting screw 9 is rotated so that the permanent magnet 6 screwed thereto is rotated.
Is moved in the axial direction of the rotating shaft 3 to change the gap C between the permanent magnet 6 and the rotating plate 4. If the gap is reduced, the electromagnetic force, that is, the load resistance increases, and if the gap is increased, the load decreases.

The electromagnetic force can also be changed by changing the number of the permanent magnets 6 arranged at equal intervals in the circumferential direction of the support member 5.

[0026]

As described above, according to the present invention, an extremely simple method of rotating a rotating plate made of an electric conductor provided opposite to a permanent magnet with a small gap in the magnetic field of the permanent magnet. In addition, a rotation load resistance can be imparted to the receiving roller with a simple device. Adjustment of the load resistance can be performed by a very simple method of adjusting the gap between the permanent magnet and the rotating plate by the adjusting member.

Further, since no electric energy is used unlike the conventional one, energy can be saved, and the operating cost and installation cost of the apparatus are reduced. Further, the heat radiation effect near the rotating body and the permanent magnet is also improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a load control device in a vehicle inspection system according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Supporting roller 3 Rotating shaft 4 Rotating plate 5 Support member 6 Permanent magnet 9 Adjustment screw

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuya Shoji 1-6-2 Moto-Akasaka, Minato-ku, Tokyo Safety Automotive Co., Ltd. (72) Inventor Takeshi Arai 1-5-2, Moto-Akasaka, Minato-ku, Tokyo (56) References JP-A-63-274360 (JP, A) JP-A-54-72801 (JP, A) JP-A-63-253232 (JP, A) JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01M 17/007 G01L 3/00-5/28

Claims (3)

(57) [Claims] An inspection system for a vehicle, such as an automobile, a motorcycle, or the like, on which a pair of rotating support rollers are mounted to perform various inspections of the vehicle. A disk-shaped rotating plate fixed to a rotating shaft made of an electric conductor and fixed to a supporting member movable in the axial direction of the rotating shaft, and opposed to the rotating plate with a small axial gap. A load control device for a vehicle inspection system, comprising: a permanent magnet; and an adjustment mechanism that moves the permanent magnet in an axial direction to adjust the gap between the rotating plate and the permanent magnet. 2. The load control device in a vehicle inspection system according to claim 1, wherein a plurality of pairs of the rotating plate and the permanent magnet are arranged in the axial direction of the rotating shaft. 3. An N pole and an S pole of the permanent magnet are alternately arranged,
The load control device according to claim 1, wherein a plurality of poles are arranged at equal intervals in a circumferential direction of the support member.