JPS623666A - Tire lock detector - Google Patents

Abstract

PURPOSE:To reduce the variance of precision and to obtain accurate data by providing a roll, a stop sensor, a display means, etc. CONSTITUTION:A device body 10 is arranged in the position where a roll 20 is pressed to a tire by the energizing force of a spring 313. A sensor roll 41 is rotated in accordance with the rotation of the roll 20, and a stop sensor 40 outputs a rotation signal (r) as a turn-on/off pulse signal thereby to flicker a lamp 50. When the tire is set to the lock state thereafter by putting on the brake, the roll 41 stops rotation, and the front ends of brush contacts 421 and 422 of the sensor 40 are brought into contact with only a conductive part 411 or an insulating part 412 of the roll 41 as they are, and a stop signal (s) consisting of only the turn-on or off signal is outputted, and the lamp 50 is kept in lit or extinguished state as it is. The roll 20 can change the direction of a rotary shaft 21 in accordance with the change of the rotation direction of the tire, and the error between the rotation of the rotary shaft 21 and that of the tire due to the occurrence of friction or the like is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tire lock detection device used for automobile brake tests and the like.

(Prior Art and Problems) Conventionally, there has been no tire lock detection device used during brake tests, which has caused the following problems.

Some brake tests use roller-driven brake testers.

This roller-driven brake tester, for example, as shown in pages 243 and 244 of Automotive Engineering Complete Book 12 Tires and Brakes (Sankaido), places a vehicle on a drive roller, drives the drive roller with an electric motor, and brakes the vehicle. The braking force of each wheel is determined by the reaction force when the brake is applied.

However, currently, checking the locked state of the tires as the brake force increases is done visually, and it is necessary to station one person on each side of the vehicle to check the locking of the tires. In addition, at least four people were needed, including a person to press the brake pedal and a recorder, making it a labor-intensive process.

Furthermore, since this work was carried out in collaboration between the four workers, and the tire lock status was communicated through the worker, the accuracy of the data varied due to the cooperation, resulting in poor data accuracy.

By the way, the fifth method is used to measure the rotation of a rotated object.
There is a hand-held tachometer shown in the figure.

This tachometer measures the number of rotations of the rotating body E by pushing the roller 01 at the tip onto the rotating body E, and measures the number of rotations of the rotating body E by the number of rotations displayed on the meter 02 of the roller 01. When used as a lock detection device, there are the following problems.

Since it is a handy type, it requires a person to press the tachometer against the tire, which requires the same amount of manpower as visual inspection.

Further, since the roller 01 is not movable in the pressing direction, the roller 01 is separated from the tire due to irregularities of the tire such as lettering, and errors occur because the roller 01 is not always pressed against the tire.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned conventional problems, and in order to achieve the purpose, the tire lock detection device of the present invention uses A roller is provided that comes into contact with the tire and rotates as the tire rotates, and the roller is urged to come into pressure contact with the tire by a support member attached to the main body of the device, and is moved in the direction of pressure contact with the support member. The roller is supported such that the roller is provided with a stop sensor that detects rotation stoppage of the roller and outputs a stop signal that is an electric signal, and is provided with a display means that inputs the stop signal and displays the stopped state of the roller. This was the means by which

(Function) Therefore, in the tire lock detection device of the present invention, because of the above-mentioned means, when the tire is in the low 2 state, a stop signal is output from the stop sensor, and the display means to which the stop signal is input is displayed. , you can know the lock status,
Moreover, since the stop signal is an electric signal, it is possible to accurately detect tire lock without any time loss.
The display means can be provided at a position away from the tire,
Therefore, it is possible to know whether the tire is locked from a position away from the tire.

In addition, since the roller is movable in the direction of pressure contact with the tire, when the roller is pressed against the side of the tire, even if there are irregularities such as lettering on the side of the tire, the roller will move to accommodate the irregularities. is firmly pressed against the tire.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the embodiment shown in FIGS. 1 to 4 will be described.

A is a tire lock detection device according to an embodiment of the present invention,
Device body 10. Roller 20. Support member 30, stop sensor 40. A lamp (display means) 50 is provided.

The apparatus main body 10 is formed from a base 11 and a support 12, as shown in FIG.

The base 11 is formed of a rectangular parallelepiped magnet.

Further, the support column 12 is a cylindrical square pillar and is erected on the base 11.

The roller 20 is in pressure contact with the tire B of the automobile and is rotated as the tire B rotates so as to know the rotational status of the tire B. The roller 20 is rotatably attached to the support member 30. is supported by

Note that the roller 20 is supported by supporting a rotating shaft 21 fixed to the roller 20.

The support member 30 urges the roller 20 to come into pressure contact with the tire B, and supports the roller 20 so as to be movable in the pressure contact direction in accordance with the unevenness of the surface of the tire B. A support rod 31 that is slidably supported by the support column 12 of the device main body 10, and the support rod 31
and a support bracket 32 that is rotatable about the axis of the roller 20 and supports the roller 20.

The roller 20 is supported such that its rotational axis is always perpendicular to the rotational axis of the support bracket 32.

The support rod 31 includes a large diameter portion 311 and a small diameter portion 312. As shown in the figure, the small diameter portion 312 is provided with a spring 313 and is urged to slide in the direction of the roller 20.

The slide of the support rod 31 due to the bias toward the roller 20 is regulated by a split pin 314 provided at the end of the large diameter portion 311 so as to be located within the support 12 .

Further, a bearing 315 is provided at the end of the large diameter portion 311 on the roller side.
is provided.

The support bracket 32 supports the bearing 3 of the support rod 31.
15.

The stop sensor 40 detects the stoppage of rotation of the roller 20 and outputs a stop signal S, which is an electric signal. The stop sensor 40 includes a sensor roller 41 and a sensor switch 42.

The sensor roller 41 is connected to the rotation shaft 21 of the roller 20.
Conductive portions 411 that can be energized and insulating portions 412 that cannot be energized are alternately arranged on the outer periphery.

The sensor switch 42 is provided on the support bracket 32 so as to be located above the sensor roller 41, and the sensor switch 42 is connected to two brush contacts 4.
21 and 422, and the tips of the brush i points 421 and 422 are arranged in line with and in contact with the sensor roller 41 in the axial direction.

The brush contacts 421, 422 are connected to the + side and - side of the power supply lOO, respectively, and the brush contacts 421, 422
The stop sensor 40 emits an ON signal when the tip of the roller 2 is located in the conductive portion 411, and issues an OFF signal when the tip is located in the insulating portion 412. Therefore, the stop sensor 40 Pulse-like 0 while 20 is rotating
The rotation signal r, which is an N-OFF signal, is output and the roller 20
When the rotation stops, a stop signal S of either an ON signal or an OFF signal is output.

The lamp 50 is provided as a display means for inputting the stop signal S and displaying the stopped state of the roller 20.
This lamp 50 is connected to the brush contact 4 of the stop sensor 40.
22 and the power source 100, is blinked by the rotation signal r and remains lit by the stop signal S,
Or the light will remain off.

Next, the operation of the embodiment will be explained.

When using this tire lock detection device A, first, the magnetic base 11 is attracted to the stand T3 between the brake tester rollers Tl and T2, and the device main body 10 is placed. The position to place is roller 2.
0 is the position where the tire B is pressed against the tire B by the biasing force of the spring 313, that is, the support rod 31 is brought close to the tire B until the support rod 31 is retracted from the position where the protruding slide is regulated by the split pin 314. It's the location.

The lamp 50 is placed near the meter of the brake tester (not shown) so that the recorder can see the lamp 50 and the meter of the brake tester at the same time.

Next, a brake test is performed by rotating the tire B by driving the brake tester rollers Tl and T2. When the tire B rotates, the third roller 20
As shown in the figure, it rotates with respect to the support loft 31 together with the support bracket 32 so that the rotation axis 21 is perpendicular to the moving direction of the contact surface of the tire B, and rotates in accordance with the rotation of the tire B. do.

Then, as the sensor roller 41 rotates as the roller 20 rotates, the stop sensor 40 outputs a rotation signal r that is an ON-OFF pulse signal, and the lamp 50 blinks.

After that, when the brake is applied and the tire B is in a low state, the sensor roller 41 stops rotating, and the tips of the brush contacts 421 and 422 of the stop sensor 40 are connected to the sensor roller 41.
remains in contact with either the conductive part 411 or the insulating part 412, and a stop signal S, which is only an ON signal or an OFF signal, is output, and the lamp 50 remains on or remains off. This allows the recorder to know that tire B has become locked.

Also, if the brakes are applied while the brake tester rollers TI and T2 are rotating, the tire B and the brake tester roller Tl
, T2, and the tire B may move back and forth.

If the position of the tire B in contact with the roller 20 moves in this way, the direction of rotation of the tire B will differ at each position, but the support bracket 32 that supports the roller 20 will not rotate relative to the support rod 31. possible, and the direction of the rotation axis of the support bracket 32 is the same as that of the roller 20.
Since the direction is perpendicular to the direction of the rotation axis of the tire B, the roller 20 can change the direction of the rotation axis 21 in response to the change in the rotation direction of the tire B, thereby preventing the occurrence of friction, etc. Therefore, it is possible to prevent an error from occurring between the rotation of the tire B and the rotation of the tire B.

To explain this in a side view showing the relationship between the tire B and the roller 20 in FIG. The rotating shaft 21 faces in a direction perpendicular to the rotational movement direction a1 of the tire B.

Next, when tire B moves forward and the relative position between roller 20 and tire B is moved to position b, roller 2
0 is the direction with the least frictional resistance with tire B;
The rotation axis 21 is rotated in a direction perpendicular to the rotational movement direction bi of the tire B.

Next, when tire B moves backward and the relative position between roller 20 and tire B is moved to position C, roller 2
0 is rotated so that the rotating shaft 21 is perpendicular to the rotational movement direction C1 of the tire B at the position C, which is also the direction in which the frictional resistance with the tire B is least.

In addition, lettering B1 etc. are formed on the side of the tire B,
When there is an unevenness, since the roller 20 is elastically supported by the support member 30, the roller 20 can move in the pressing direction according to the uneven shape, and can rotate without causing an error in the rotation of the tire B. be done.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, although a lamp was used as a display means in the embodiment,
Other means such as a speaker or a pointer may also be used.

In addition, in the embodiment, the roller is biased by the support member for pressure contact with the tire, but it is performed between the support member and the main body of the device in the embodiment, but for example, between the support bracket and the support rod in the embodiment. Alternatively, it may be carried out between a support bracket and a roller.

Further, although the support member is provided so as to be slidable relative to the apparatus main body, the support member may be an arm that is swingable relative to the apparatus main body.

Further, the stop sensor may be used in addition to the one in the embodiment, as long as it detects the stoppage of rotation of the roller and outputs a stop signal.
For example, a device that generates pulses as the roller rotates using magnetism or light may be used.

Further, a magnet may not be used for the base.

(Effects of the Invention) As explained above, in the tire lock device of the present invention, the roller is provided with a stop sensor that detects the stoppage of rotation of the roller and outputs a stop signal that is an electric signal, and By providing a display means that inputs information and displays the stopped state of the rollers, it is possible to check whether the tire is locked from a distance from the tire, so when used in a brake tester, the recorder can directly check whether the tire is locked or not. This eliminates the need for a lock checker to check the tire lock next to the tire and notify the recorder of the lock check, which has the effect of reducing manpower. Since it can be known without any need for information, the variation in accuracy is reduced and more accurate data can be obtained.

Moreover, since the roller is movable in the direction of pressure contact with the tire, the rotation of the tire can be accurately measured because the roller is reliably pressed against the tire.

Furthermore, in addition to the above-mentioned effects, in the embodiment, since the base is formed of a magnet, the device can be easily fixed.

In addition, the stop sensor is simple and easy to manufacture, consisting of a sensor roller in which insulating parts and conductive parts are arranged alternately, and a sensor switch using two brush contacts. , and the cost can be reduced.

In addition, since the rotational axis of the roller is offset from the rotational axis of the support bracket, the roller is likely to swing (rotation of the support bracket relative to the support rod), and therefore the contact position with the tire may change. Easy to handle and less likely to cause errors.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a tire lock detection device according to an embodiment of the present invention, Fig. 2 is a partially sectional plan view showing how the embodiment device is used, and Fig. 3 shows a usage state of the embodiment device. a perspective view; FIG. 4 is a side view showing the orientation of the rollers of the embodiment device;
FIG. 5 is a perspective view showing a conventional tachometer. 10... Apparatus body 20... Roller 30... Support member 40... Stop sensor 50... Lamp (display means)

Claims (1)

[Claims] 1) A roller is provided that contacts the tire of the automobile and rotates as the tire rotates, and the roller is urged to come into pressure contact with the tire by a support member attached to the device body. At the same time, the roller is supported movably in the pressure contact direction by the support member, and the roller is provided with a stop sensor that detects rotation stoppage of the roller and outputs a stop signal that is an electric signal. 1. A tire lock detection device comprising: a display means for displaying a stopped state of the tire.