JP2623884B2 - Vehicle inspection method and vibration device used therefor - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) The present invention relates to a vehicle inspection method for detecting an abnormality of a vehicle using a sound generated from a vehicle body as a medium in a pseudo running state, and used for the method. The present invention relates to a vibration device.

(Prior Art) A vehicle inspection method for detecting an abnormality of a vehicle in a simulated running state by using sound generated from a vehicle body as an example is shown in FIG. 10, for example. This vehicle inspection method uses a free roller 1 installed in a general building of a vehicle factory.
A vehicle 2 is placed on top of it, and an inspector gets on it and starts the engine by applying an engine to create a simulated running state. In this state, an inspector in the vehicle observes the sound generated from the vehicle body and finds an abnormality in the vehicle It is.

(Problems to be Solved by the Invention) However, in such a conventional vehicle inspection method using sound as a medium, the vehicle noise is not only caused by the engine sound generated from the vehicle itself but also by the noise arriving from other parts in the factory. It is easy to overlook the noise generated from the vehicle body because the noise generated from the vehicle tends to be overlooked, and the inspector must perform the inspection while also performing the driving operation of the vehicle and other various functional tests. As a result, problems such as an abnormality of the vehicle body being overlooked in this inspection process are likely to occur, and complaints are attached after shipping, or abnormalities are discovered during transportation and difficult to correct. there were.

An object of the present invention is to provide a vehicle inspection method and a vehicle inspection method capable of performing an inspection intensively on a sound generated from a vehicle body without being distracted by a driving operation of a vehicle, an engine sound, a noise in a factory, and the like. An object of the present invention is to provide a vibrating device used for the device.

[Constitution of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention described in claim 1 is an invention in which each wheel of a vehicle with an engine stopped in a sound-insulated room. Are independently placed on the wheel cradle of the vibrating device, and directly apply high-frequency vibration in the vertical direction to the wheel cradle, and simultaneously move the wheel cradle up and down independently of the high-frequency vibration. A vehicle inspection method for detecting a vehicle abnormality by observing a sound generated from the vehicle body in the vibration state substantially similar to the traveling state.

A second aspect of the present invention provides a wheel cradle supporting one wheel from below, and a high-frequency vibration directly disposed on a lower surface side of the wheel cradle so as to apply high-frequency vibration to the wheel cradle. A vibration device comprising a device and a vertical movement mechanism for vertically moving the wheel cradle directly without passing through the high-frequency vibration device.

(Operation) According to the invention described in claim 1, in the sound-insulated room, the high-frequency vibration in the vertical direction is applied to each wheel of the vehicle in the engine stopped state independently.
Independently of the high-frequency vibration, high-frequency vibration is applied in the vertical direction to make the vibration state substantially the same as the traveling state, so that the inspector does not need to perform any driving operation of the vehicle, and the engine sound of the vehicle or It is possible to concentrate on the sound generated from the vehicle body and observe the sound without being distracted by noise in the factory or the like, and it is possible to more reliably detect the abnormality of the vehicle.

In the vibration device according to claim 2, the wheels of the vehicle are mounted on a wheel cradle, and if the vibration device is used, the high-frequency vibration of the high-frequency vibration device is directly applied to the vibration. As well as being given to the wheel cradle, the vertical movement of the vertical movement mechanism is also
It is transmitted directly to the wheel cradle. For this reason, the vehicle body can be brought into a vibration state closer to the running state.

(Example) Hereinafter, these inventions are demonstrated based on an Example.

FIG. 1 is a perspective view showing a vehicle inspection method according to the present invention and a vibration device used therein.

In FIG. 1, a sound insulation room 3 is provided, for example, in an inspection factory, and has a structure capable of almost completely blocking noise generated from other places in the factory.

Four vibrating devices 4, 4,... Are installed on the floor in the sound insulation room 3. These vibrating devices 4, 4,... Are embedded and fixed in pits, respectively, so that sound does not leak into the sound insulation room 3.

Each of the wheels 6 of the vehicle 5 is supported one by one by the vibrating devices 4, 4,....

 2 to 4 are views showing the vibration device 4. FIG.

In these figures, a disk 403 is fixed to a shaft of an electric motor 402 fixed on a base 401, and one end of a link rod 404 is eccentrically attached to the disk 403. A slide block 406 that can reciprocate horizontally by a horizontal guide 405 is attached to the other end of the slide block 406.

A compression spring 407 biases the slide block 406 rightward in the drawing.

Further, the slide block 406 is connected to a support plate 411 supporting the wheel support 409 via a link bar 408.

Specifically, sliders 412 along the vertical direction are fixed to both sides of the wheel receiving base 409, and the sliders 412 are vertically movably inserted into the vertical guides 410 as shown in FIG. In addition, an electric vibrator 413 as a high-frequency vibration device that applies high-frequency vibration to the lower surface side of the wheel receiving base 409 is directly disposed to be suspended,
A holding member 414 that holds the wheel 6 is provided on the upper surface side.

This electric vibrator 413 is, as shown in FIG.
A rubber casting cylinder 416 is mounted on the fixed casting 415, and a cover 417 is mounted on the rubber supporting cylinder 416 to form a case 418. To this fixed casting 415, fixed iron core 419, coil 420,
While the fixed bowl-shaped iron core 421 is fixed, the movable casting 422 is fixed to the fixed casting 415 via the impact rubber seat 423 and the rubber supporting cylinder 416.
Is attached via a rubber spring 424.

A movable iron core 425 is fixed to the movable casting 422 on the coil 420 side.

On the other hand, on the support plate 411, as shown in FIG. 3, a plurality of cylindrical holders 426 are provided.
A cylindrical cushion rubber 427 is disposed in the
The support bar 428 fixed to the wheel receiving base 409 is inserted therein, so that the wheel receiving base 409 is supported by the support plate 411.

The cushioning rubber 424 is hard against the vertical force so that the vertical driving force of the support plate 411 is directly transmitted to the wheel support 409, and the horizontal force is used to absorb horizontal vibration. Is set softly.

With this, when the electric motor 402 is rotated, a crank mechanism including the disk 403 and the link rod 404 causes
The rotational motion of the electric motor 402 is converted into horizontal reciprocating motion of the slide block 406, and at the same time, the horizontal reciprocating motion of the slide block 406 is converted into vertical reciprocating motion of the support plate 411 via the link rod 408. In this way, a vertical movement mechanism that converts the rotational motion generated from the electric motor 402 into a vertical reciprocating motion and directly transmits the rotary motion to the wheel receiving base 409 without passing through the electric vibrator 413 is configured.

As a result, the wheel cradle 409 reciprocates up and down at a frequency corresponding to the rotation speed of the electric motor 402.

The connection point between the disk 403 and the link bar 404 is adjusted to have an appropriate degree of eccentricity, and by adjusting this eccentric distance, the stroke in the vertical reciprocating motion of the wheel receiving base 409 can be adjusted. I have.

Next, a vehicle inspection method performed using the vibration device 4 will be described.

The vehicle 5 is introduced into the sound insulation room 3, and each wheel 6 is
Place on top.

Then, a start command is given to each of the vibration devices 4 from a control panel or the like (not shown), and the electric motor 402 is driven to move the slide block 406 forward and backward, thereby moving the support plate 411 up and down via the link rod 408. Then, the driving force of the support plate 411 is directly transmitted via the support rod 428 to the wheel support 40.
9, the wheels 6 of the vehicle 5 are independently moved up and down independently of the high-frequency vibration generated by the electric vibrator 413, without passing through the electric vibrator 413, so that the traveling state is substantially the same. Gives vibration to the vehicle body.

At the same time, the electric vibrator 413 fixed to each wheel receiving base 409 is actuated, and simultaneously with the vertical movement, a high-frequency minute vibration is independently applied from the lower surface side of each wheel receiving base 409.

At this time, the electric vibrator 413 is disposed on the lower surface side of the wheel support 409 so as to be suspended, and is separated from the support of the vehicle body weight. As described above, since the mechanism for vertically moving the support plate 411 via the link bar 408 and the electric vibrator 413 are arranged in parallel, the vertical movement of the support plate 411 via the link bar 408 is not affected. The electric vibrator 413 is transmitted to the wheel cradle 409 independently without passing through the electric vibrator 413, so that no load is applied to the electric vibrator 413. Therefore, high-frequency vibration can be given to the vehicle body with high output efficiency.

This high frequency vibration is absorbed by the rubber spring 424 and is hardly transmitted to the support plate 411.

At this time, the capability range of the electric vibrator 413 is a range A of a triangle in FIG. 5, and when combined with a capability range not using the electric vibrator 413 (a range B of a parallelogram in the figure), the overall capability range is very low. Vehicle 5
Driving vibration can be approached.

At this time, as described above, by adjusting the rotation speed of the electric motor 402 and the degree of eccentricity of the connection point between the disk 403 and the link rod 404, the stroke and the vibration frequency in the vertical reciprocating motion of the wheel 6 are appropriately set. Keep it.

The frequency may be changed with time in a fixed pattern by controlling the number of revolutions of the electric motor 402 and the frequency of the electric vibrator 413 with a microcomputer.

The inspector gets into the vehicle 5 and concentrates on nerves generated from various parts of the vehicle body to detect an abnormality of the vehicle body.

At this time, since the vehicle 5 is in the sound insulation room 3,
The noise from other places in the factory is completely shut off, and the engine is stopped, so that the noise generated from the vehicle body can reach the ears of the inspector without being drowned by them. Since there is no need for the worker to perform extra work such as driving operation, the worker can concentrate on the listening sound work. In addition, as described above, since the vehicle can be brought closer to the traveling vibration of the vehicle 5, an appropriate inspection can be performed.

6 and 7 show another embodiment of the vehicle inspection method according to the present invention.

In this embodiment, microphones 7, 7,... Are attached to a plurality of locations in a vehicle, and signals from these are amplified by an amplifier 8,
Inspectors in the driver's seat can listen to the music through headphones 9 or record on the recorder 10.

As shown in FIG. 7, an operation panel 11 is mounted in the sound insulation room 3 at a position accessible from the driver's seat. The operation panel 11 includes a recording switch 11a and a microphone select switch 11b. Is provided.

Accordingly, the inspector can appropriately operate the recording switch 11a and the microphone select switch 11b on the operation panel 11 by reaching through the window from the driver's seat inside the vehicle, thereby allowing the entire interior of the vehicle 5 to be divided into parts. Inspection can be performed, and if necessary, the sound generated at that time can be recorded on the recording device 10 so that the sound can be reproduced later for detailed analysis.

Further, by comparing the content recorded on the recorder 10 with the case of the vehicle after repairing the abnormal part, it is possible to easily confirm the recovery from the abnormality.

8 and 9 are views for explaining another embodiment of the vehicle inspection method according to the present invention.

In this embodiment, a signal from a microphone 7 installed in the vehicle compartment is input to the upper and lower, left and right frequency analyzers 13 and 14 via the input / output interface 12, and the frequency is analyzed here. The result is input to CPU15.

The CPU 15 records the waveforms of the types of sounds that may occur, compares them with the generated sounds, searches for similar waveforms, and finally displays them on the CRT screen 16 or the printer 17.
The result is output above.

In substantially the same manner, a location where abnormal noise is generated is three-dimensionally determined based on signals from the plurality of microphones 7 and displayed on the screen of the CRT 16 using XYZ coordinates.

FIG. 9 is a diagram showing a display example of a CTR screen. As shown in the figure, a three-dimensional figure 16 of the vehicle body is displayed on the CRT screen 16a.
1 and a plane figure 162 are drawn, and asterisks 163 and 164 are displayed at places where abnormal noise occurs.

In addition, in the lower right corner of the CRT screen 16a,
In this example, it is displayed as "trimming sound".

Based on this, the inspector can perform the vehicle inspection using this kind of sound without getting into the vibrating vehicle, and can significantly reduce the physical fatigue of the inspector.

In the above embodiment, the slider 412 is provided on the wheel receiving base 409. However, the present invention is not limited to this, and it goes without saying that the slider 412 may be provided on the support plate 411. In addition, even if an air cylinder or the like is used to move the wheel receiving base 409 up and down, independently of the electric vibrator 413, independently of the high-frequency vibration generated by the electric vibrator 413, the vertical movement is performed. It is needless to say that any signal can be transmitted to the wheel support 409.

[Effects of the Invention] As described above, according to the vehicle inspection method according to the present invention, the inspector does not interfere with factory noise, engine noise, and the like, and furthermore, is directly affected by high-frequency vibrations in the vertical direction. By applying independent vertical movements, it is possible to give vibrations closer to the running state to the vehicle body, and it is possible to accurately detect abnormality of the vehicle based on abnormal noise generated from the vehicle body.

Further, according to the vibration device of the present invention, the up-down movement of the up-down movement mechanism is transmitted to the wheel receiving stand independently of the up-down direction high-frequency vibration directly applied without passing through the high-frequency vibration device. At the same time, the high-frequency vibration in the vertical direction of the high-frequency vibration device is also applied to the wheel cradle, and has a practically useful effect that the vehicle body can be brought into a vibration state closer to a running state.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a vehicle inspection method according to the present invention, FIG. 2 is a perspective view showing one embodiment of a vibration device, and FIG. Fig. 4, Fig. 4 is a front view of a half section of the electric vibrator, Fig. 5 is a graph showing a vibration characteristic curve of the vibrator, and Figs. 6 and 7 show another embodiment of the vehicle body inspection method. Diagram for explaining,
8 and 9 are views for explaining still another embodiment of the vehicle body inspection method, and FIG. 10 is a view for explaining a conventional vehicle body inspection method. 3 ... Sound insulation room 4 ... Exciting device 5 ... Vehicle 6 ... Wheel 402 ... Electric motor 404 ... Link rod 406 ... Slide block vertical movement mechanism 408 ... Link rod 409 ... Wheel support 413 ... … Electric vibrator (high frequency vibration device)

Claims (2)

(57) [Claims] In a sound-insulated room, each wheel of a vehicle in an engine stopped state is independently mounted on a wheel cradle of a vibration device, and a high frequency vibration in a vertical direction is directly applied to the wheel cradle. At the same time, independently of the high-frequency vibration, the wheel cradle is moved up and down to a vibration state substantially similar to the running state, and a sound generated from the vehicle body is observed in that state to find out an abnormality of the vehicle. A vehicle inspection method characterized by the above-mentioned. A high-frequency vibration device disposed directly on a lower surface of the wheel cradle so as to apply a high-frequency vibration to the wheel cradle; A vertical movement mechanism for directly moving the wheel cradle up and down without passing through a vibration device.