JPH06300061A - Brake testing device - Google Patents

Abstract

PURPOSE:To know a change of the friction surface condition, and to develop a brake device, and to improve the friction characteristic by analyzing the friction surface of a disc rotor at a high ejection efficiency under the condition that the friction surface after the measurement of the friction characteristic is left as it is without hindering the friction characteristic of the friction surface of the disc rotor. CONSTITUTION:In a brake device, which consists of a brake pad for braking the rotation of tires, a brake caliper and a disc rotor or the like, metal pieces, which are made of the same material with the disc rotor 9 and which can be disconnected freely, are buried in the disc rotor 9. As a metal piece to be buried in the disc rotor 9, a bolt 11 having a diameter in a range from 5% or more to 50% or less of a sliding width of the disc rotor 9 is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake performance evaluation test device.

[0002]

Brake devices are required to have stable and improved friction characteristics. Then, conventionally, friction characteristics, changes in the friction surface, etc. have been measured and analyzed.

[0003]

Conventionally, the relationship between friction characteristics and changes in friction surface has not been clear. So far
In order to analyze the friction surface of the disc rotor after measuring the friction characteristics, it is extremely difficult to store the friction surface in the state after the measurement because the disc rotor must be processed after the measurement according to the size of the analyzer. Met. Also, it is not economical because it sacrifices the disk rotor.

The present invention has been made because it has been found that the friction characteristic and the friction surface of the disk rotor are closely related to each other, and the friction characteristic can be measured without impairing the friction characteristic of the friction surface of the disk rotor. The purpose is to learn the changes in the friction surface state by taking out the subsequent friction surface while preserving it and analyzing it efficiently so as to develop a braking device and improve the friction characteristics.

[0005]

FIG. 1, FIG. 2 and FIG. 3 corresponding to an embodiment of the constitution of the present invention for achieving the above object.
Describing with reference to the present invention, the present invention relates to a brake test device including a brake pad for braking the rotation of a tire, a brake caliper, and a disc rotor, in which a removable metal piece of the same quality as the disc rotor is embedded in the disc rotor. I am taking steps.

First, the rotating shaft 3 is rotated by the driving motor 1 via the belt 2. A roller 4 and an inertial disk 5 are mounted on the rotary shaft 3. One tire 6 of the test vehicle is placed on the roller 4, and the tire 6 is rotated in accordance with the rotation of the roller 4.
Rotates. When the motor 1 is started and the rotating shaft 3 reaches a specified number of revolutions, the power of the motor 1 is shut off and the disc rotor 9 in which the bolt inside the tire 6 is embedded is pinched by the brake pad in the brake caliper 10. Perform a brake test. Tachometer 7 fixed to the end of rotating shaft 3
Measure the number of rotations of the roller with the brake caliper 10
The hydraulic pressure that operates the internal hydraulic cylinder is measured by the hydraulic pressure sensor 8.

A disk rotor 9 having bolts embedded as metal pieces is shown in FIGS. The bolts 11 are arranged at equal intervals so that the disc rotor 9 rotates stably,
It is preferable to attach the tire 6 from the inner side so that the tire 6 can be taken out with the tire attached. By embedding a plurality of bolts 11 in the disk rotor 9, it is possible to reduce variations in the friction surface depending on the take-out position. Also,
If the diameter of the bolt 11 is 5% or less of the sliding width of the disk rotor 9, the desired average friction surface cannot be obtained and 50%
When it is above, vibration occurs at the step.

[0008]

According to the present invention, by the above means, the friction characteristics of the friction surface of the disk rotor are not impaired, and the friction surface of the disk rotor after the measurement of the friction characteristics can be easily taken out while being preserved. Thus, by analyzing the friction surface of the bolt taken out, it is possible to know the change in the friction surface state and the relationship between the friction characteristic and the friction surface state.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. A 37 KW DC motor was used as the driving motor 1, and the rotating shaft 3 was rotated via the belt 2.
A roller 4 and an inertial disk 5 are mounted on the rotary shaft 3.
At this time, the moment of inertia of the rotating shaft 3 was set to 45 kg / m ² according to the model vehicle. One tire 6 of the test vehicle was placed on the roller 4, and the tire 6 was rotated in accordance with the rotation of the roller 4.

When the motor 1 is driven and the rotating shaft 3 reaches a prescribed number of revolutions, the power of the motor 1 is shut off, and the disc rotor 9 in which the bolt inside the tire 6 is embedded is sandwiched by the brake caliper 10. I did a brake test. Further, as shown in JASO C 427, a K thermocouple was embedded in the test brake pad and a brake test was conducted at a constant sliding temperature.

A tachometer 7 was fixed to the end of the rotary shaft 3 and the number of rotations of the roller 4 was measured. The tachometer 7 uses a photoelectric pulse generator, and the pulse signal is converted into a voltage value by an FV converter. A strain gauge type pressure transducer was used as a hydraulic pressure sensor for measuring the hydraulic pressure for operating the hydraulic cylinder inside the brake caliper 10.

The bolt 11 has a diameter of 4 mm (sliding width of about 8 mm).
%), And twelve disk rotors 9 are arranged at equal intervals so as to rotate stably. Also, the bolt 11 is the tire 6
A hexagon wrench hole was formed on the inner side of the bolt 11 so that the bolt 11 could be taken out from the inner side while being attached.

[0013]

As described above, the present invention provides a brake testing apparatus comprising a brake pad for braking the rotation of a tire, a brake caliper, and a disc rotor, in which a removable metal piece of the same quality as the disc rotor is embedded in the disc rotor. Therefore, the friction characteristics of the friction surface of the disc rotor can be measured, and by removing the embedded bolt, the disc rotor can be easily and economically taken out without sacrificing the friction surface. It is also possible to investigate the relationship between friction characteristics and friction surface state.

[Brief description of drawings]

FIG. 1 is a side view of a brake device used in the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of FIG.

[Explanation of symbols]

1. Motor 2. Belt 3. Rotation axis 4. Laura 5. Inertial disk 6. Tire 7. Tachometer 8. Oil pressure sensor 9. Disk rotor 10. Brake caliper 11. bolt

Claims (2)

[Claims] 1. A brake device comprising a brake pad for braking the rotation of a tire, a brake caliper, and a disk rotor, wherein a removable metal piece of the same quality as the disk rotor is embedded in the disk rotor. Brake test equipment. 2. The metal piece embedded in the disk rotor is a bolt, and the diameter thereof is 5% or more and 50% or less of the sliding width of the disk rotor.
The described brake testing device.