KR20090016136A - Testing system and method for break disc of automobile - Google Patents

Abstract

A vehicle brake disc test apparatus and method are provided to test a brake disc of a vehicle by using a simple tester without using a real test vehicle and dynamo so as to remarkably reduce a test time and cost. A vehicle brake disc test apparatus includes a driver, a slip ring(32), a disc(30), a caliper mounting jig(33), a caliper(34), a blower(50), and a bomb(40). The driver generates a driving force according to a control signal of a controller. The slip ring and the disc are connected to the driver. The caliper mounting jig is connected to the disc. The caliper is mounted on the caliper mounting jig and includes a pad(35). The blower is arranged in front of the slip ring. The bomb includes a pneumatic control valve(41) operated according to a control signal of the controller.

Description

Testing system and method for break disc of automobile}

The present invention relates to a test apparatus and method for a brake disc of an automobile, and more particularly, to reduce the test cost and to reduce the cost of the disc by reproducing the surface breakage of the brake disc that can occur due to long-term durability in a real vehicle in a short period of time. The present invention relates to a test apparatus and method for a brake disc of a vehicle capable of checking quality and performance.

In general, when a new car is developed, in order to prevent problems or dangers that may occur by accurately determining the performance, durability, and driveability of the car, various tests of the respective devices are performed not only at the development stage but also after the development of the new car.

In particular, in recent years, as a vehicle has high performance, there is an urgent need for a brake system having sufficient braking force and stability under any conditions in order to secure a strong and stable braking performance.

In accordance with such demands, conventional brake dynamo tests are used to measure the general performance of brakes, squeal noise, wear of friction materials, high-speed abnormal vibrations, and effect characteristics (i.e., high speed, low speed, temperature, and hydraulic pressure). It simulates the actual vehicle by dynamo meta test, and has grasped the performance of the service brake of the vehicle.

On the other hand, in general, a disc brake is a device that generates braking force by converting kinetic energy into thermal energy by friction force and releasing this heat energy into the atmosphere. A disc brake disc that rotates together with a wheel is strongly applied to pads provided on both sides of the disk. Press to get braking force.

At this time, the kinetic energy of the wheel is converted into thermal energy by the friction force between the brake disc and the pad, and the heat causes the brake disc to be in a high temperature state.

In addition, thermal deformation occurs in the brake disc due to a difference in heat conduction between the inside and the outside of the brake disc due to the high temperature.

When the brake disc is cooled, the surface is compressed, and the process of thermal deformation due to high temperature is repeated repeatedly, thermal breakage occurs in the brake disc.

When the dynamo test using a real vehicle is used to test the thermal rupture durability caused by such a thermal shock, there is a problem that a lot of cost is required and that it must be carried out over a long period of time.

The present invention has been invented to solve the above problems, and since it is difficult to analyze the thermal rupture characteristics generated in the brake disc using a real vehicle and an expensive dynamo over a long period of time, a brake using a low-cost simple test apparatus It is an object of the present invention to provide a test apparatus and method for a brake disc of an automobile which can effectively grasp the breaking durability performance of the disc by repeating the temperature rise and cooling, which are conditions for causing the disc to break.

In order to achieve the above object, the present invention provides a driving means for generating and transmitting a driving force by the control signal of the control unit; A slip ring and a disk connected to the driving means and mounted on the disk mounting portion; A caliper mounting jig connected to the disk, and a caliper mounted on the caliper mounting jig and having a pad embedded therein; A blower disposed in front of the slip ring; It provides a test device for a brake disc of the vehicle, characterized in that it comprises a; a cylinder having a pneumatic control valve operated by the control signal of the control unit.

On the other hand, by using a drive means to rotate the disk, when the speed of the disk is the maximum speed, the braking process of the brake disc of the vehicle characterized in that the braking process is repeated 100 times or more with a braking interval repeatedly. Also provides.

In addition, the braking process,

The servo motor is driven by the control signal of the controller, and the driving force is transmitted to the disk. When the slip ring transmits the temperature and speed of the disk to the controller, the controller sends a control signal to operate the pneumatic regulating valve. ; The pad of the caliper to apply a brake to the disk; characterized in that it comprises a.

Preferably, the disc is initially braked at full speed, and the deceleration is given at a pressure of 40 to 140 kgf / cm 2 to decelerate until the end of braking speed drops to 0 to 5 KPH, the initial braking temperature is 80 ° C., and the braking interval Is determined based on the initial braking temperature, and the blower supplies the blowing air at 11 m / s, characterized in that the cooling conditions are executed while repeatedly performing the braking process.

The test apparatus and method for a brake disc of an automobile according to the present invention has the effect of drastically reducing the experiment time and cost by using a simple test apparatus to meet the actual vehicle conditions without using the actual vehicle and dynamo.

There may be a plurality of embodiments of the present invention, the following will be described in detail with respect to a preferred embodiment.

In addition, in the drawing used for description, overlapping description may be abbreviate | omitted about the part same as a prior art.

Through the preferred embodiment will be able to better understand the object, features and advantages of the present invention, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a schematic view showing a test apparatus for a brake disc of a vehicle preferably implemented according to the present invention, and FIG. 2 is a flowchart schematically showing a mechanism in which thermal rupture occurs, and FIG. A diagram showing a disk in which thermal rupture occurred using the test apparatus according to the invention.

One embodiment of a test device for a brake disc of a vehicle preferably implemented according to the present invention is repeatedly carried out a process of applying a surface compression and tensile stress by rapidly raising and cooling the brake disc (hereinafter referred to as the disc) 30 In this way, thermal rupture generated in the disk 30 in a short time is generated and its characteristics are analyzed.

To this end, first, as shown in FIG. 1, the servo motor 20 is configured as a driving means for generating and transmitting a driving force by a control signal of the controller 10.

In addition, the slip ring 32 connected to the servo motor 20 is mounted on one side of the disc mounting unit 31, and the blower 50 for providing the vortex air corresponding to the traveling speed includes the slip ring ( 32) arranged in front of the configuration.

The disk 30 is mounted on the other side of the disk mounting unit 31, and the caliper 34 provided with the pad 35 is mounted using the caliper mounting jig 33 connected to the disk 30.

On the other hand, a bomb 40 for providing compressed air by the control signal sent by the control unit 10 receives the signal transmitted from the slip ring 32 is configured.

The cylinder 40 stores the compressed air in a high pressure state therein, and supplies air to the pneumatic pneumatic line 42 using the pneumatic control valve 41 provided on one side.

Hereinafter, the test method according to an embodiment of the present invention configured as described above are as follows.

First, before testing the thermal rupture durability using the brake disc test apparatus according to the present invention, after the installation confirmation test to check whether the test device is installed properly, the braking pressure to 40kgf / ㎠ The process of taming the pads.

This is carried out under the conditions listed in Table 1 below, and these conditions are typical of the installation verification test and the tamping of the pads.

Test Order Initial braking speed (kph) Braking terminal speed (kph) Deceleration (g) Braking interval (sec) Initial braking temperature (℃) Wind speed (m / s) Cycles Installation confirmation test 48 0.5 0.3 30 Room temperature 11 10 Taming the pad 80 0.5 0.35 30 50 11 200 Thermal break (primary) Top speed 0 1.0 Initial braking temperature reference 80 11 50 Thermal break (secondary) Top speed 0 1.0 Initial braking temperature reference 80 11 50 check Check disk

After the installation verification test and the pad taming process, the thermal break durability of the disk 30 is tested under the conditions shown in Table 1 above.

First, when the control unit 10 sends a control signal to the servo motor 20 to drive, the driving force is transmitted to the disk 30 through the drive while rotating up to 2,500 rpm.

Then, the slip ring 32 sends the speed and temperature information of the disk 30 to the control unit 10, the input control unit 10 sends a control signal to the pneumatic control valve (41).

Then, the pneumatic control valve 41 is opened according to the control signal to supply the compressed air in the cylinder 40 to the caliper 34.

Then, the piston of the caliper 34 causes the pad 35 to move toward the disk 30 to apply a braking force to the disk 30 between the pads 35.

When the disk 30 operated in this way is braked using the caliper pad 35, the braking temperature is increased. The braking temperature is affected by the initial speed and weight of the vehicle, and thus the vehicle's GVW (GROSS VEHICLE). We start braking at the highest speed and reproduce it in the harshest conditions that the vehicle can receive and generate thermal breaks in a short period of time.

At this time, the deceleration is given at a pressure of 40 to 140 kgf / cm 2 to decelerate until the end of braking speed drops to 0 to 5 KPH, thereby reproducing the sudden deceleration condition during actual driving.

When the deceleration is reduced to 40 kgf / cm2 or less, it is difficult to maximize the effect of the acceleration durability, and it is difficult to accurately produce the acceleration effect, and it is difficult to reproduce the actual braking condition when decelerating to 140kgf / cm2 or more. Since feasibility becomes less, it is preferable to reduce by 40-140 kgf / cm <2> pressure.

In addition, by using the blower 50 under normal conditions, air is supplied at a maximum of 11 m / s to reproduce actual driving wind speed conditions.

Then, the disk 30, which is braked by friction with the pad 35 inside the caliper 34, is subjected to braking heat on the surface, and due to the heat, the disk 30 is brought to a high temperature and tensile stress is applied thereto.

The initial braking temperature of the disk 30 is 80 ° C., which is a condition that is generally maintained in the bulk of the disk among the general braking conditions of the actual vehicle.

Initial braking temperature Braking at temperatures lower than 80 ° C ± 20 ° C is not acceptable as a condition for maximizing acceleration durability, and braking at higher temperatures results in excessive disk temperature and excessive pad (friction) temperature. You cannot rise and do the right test.

In addition, the braking interval is determined based on the initial braking temperature. In other words, until the braking temperature drops to the initial braking temperature, the braking is resumed when the elevated disk temperature cools down to the initial braking temperature.

At this time, the disk 30 in the initial braking temperature state is relatively cooled and the surface is compressed.

As described above, the surface of the disk 30 repeatedly performs the tensioning and compression process to generate thermal breaks in the disk 30.

In the case of a real vehicle, in order to generate thermal breakage, the endurance driving must be severely over 100,000 km. Therefore, the above test procedure is repeatedly performed at least 100 times to satisfy this problem.

Then, after the test is performed 50 times to measure the material thermal characteristics of the disk 30, a cooling condition is waited until the temperature of the elevated disk 30 drops to room temperature, and the remaining 50 tests are reproduced. To complete the test process.

The disk 30 analyzes the thermal rupture durability by comparing the surface state before and after the test.

While the invention has been shown and described with respect to certain preferred embodiments, the invention is not limited to these embodiments, and those of ordinary skill in the art claim the invention as claimed in the appended claims. It includes all embodiments of the various forms that can be carried out without departing from the spirit.

1 is a configuration diagram schematically showing a test apparatus for a brake disc of a vehicle preferably implemented according to the present invention;

2 is a flowchart schematically showing a mechanism in which thermal rupture occurs;

3 is a view showing a disk in which thermal rupture occurred using the test apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

10 control unit 20 servo motor

30: disc 31: disc mounting portion

32: slip ring 33: caliper mounting jig

34: Caliper 35: Pad

40: cylinder 41: pneumatic control valve

42: hydraulic pneumatic line 50: blower

Claims (4)

Driving means for generating and transmitting a driving force by a control signal of a controller; A slip ring and a disk connected to the driving means and mounted on the disk mounting portion; A caliper mounting jig connected to the disk, and a caliper mounted on the caliper mounting jig and having a pad embedded therein; A blower disposed in front of the slip ring; A bomb having a pneumatic control valve actuated by a control signal of the controller; Test device for a brake disc of the vehicle, characterized in that configured to include. A test method for a brake disc of a vehicle, wherein the disc is rotated by using a driving means, and the braking process of decelerating and braking when the speed of the disc reaches the maximum speed is repeated 100 times or more with a braking interval. The method of claim 2, wherein the braking process, The servo motor is driven by the control signal of the controller, and the driving force is transmitted to the disk: When the slip ring transmits the temperature and speed of the disk to the control unit, the control unit sends a control signal to operate the pneumatic control valve; The pad of the caliper brakes the disc; Test method for a brake disc of the vehicle, characterized in that comprises a. The method according to claim 3, The disc is initially braked at full speed, decelerated at 40-140 kgf / cm2 pressure, and decelerated until the end of braking speed drops to 0-5KPH, The initial braking temperature is 80 ℃, the braking interval is based on the initial braking temperature, Blower supplies air at 11m / s, Test method for a brake disc of a vehicle, characterized in that the cooling condition is executed while repeatedly performing the braking process.

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