KR20030050900A - A Impact Energy Absorbing Tester under Kinetic Load for Tire - Google Patents

Abstract

PURPOSE: An absorbing force measuring apparatus for a tire is provided to measure characteristic of the tire with respect to a load applied to the tire being rotated by measuring energy absorbed by the tire. CONSTITUTION: An absorbing force measuring apparatus includes a driving motor(2) provided at an upper portion of a guide bar(1). A rotating shaft(3) extends from the driving motor(2). A displacement gauge(5) is positioned below the driving motor(2). A recorder(10) is electrically connected to the displacement gauge(5). A load falling section(6) is connected to the rotating shaft(3) through a cable(4). An impact member(7) is screw-coupled into a lower portion of the load falling section(6). A fixing shaft(8) is attached to a lower portion of the guide bar(1). The displacement gauge(5) is a non-contact type measuring device.

Description

A Impact Energy Absorbing Tester under Kinetic Load for Tire}

The present invention relates to a device for measuring the impact energy absorbing force of a tire to the external dynamic load, in particular the dynamic load impact energy of the tire to measure the energy absorbed by the tire based on the potential energy value of the object having a certain mass An absorption force measuring apparatus.

As is well known, tires must perform basic functions while satisfying many requirements due to their characteristics. In particular, in recent years, riding comfort is required as an important performance.

Basically, in order to improve the ride comfort of the tire, it is advantageous if the tire response to the external excitation is minimized, but the elastic force of the constant cannot be excluded due to the characteristics of the tire. That is, since the response characteristics to the tire's external excitation are determined by the stiffness value and the damping value, accurate measurement of the stiffness value and the damping value is required to optimize the ride comfort of the tire.

Currently, the method of measuring the stiffness of a static tire is used to measure longitudinal stiffness in the longitudinal direction, lateral stiffness in the axial direction, and torsional stiffness. Among these measured values, the longitudinal stiffness is closely related to the ride comfort of the tire. Has

However, during the actual driving, there was a problem in that the longitudinal rigidity characteristics of the tire measured in the static state were not used as it was because the load was applied to the longitudinal direction of the tire in a dynamic state. Protruding month tester, a test method, had the disadvantage of requiring complexity of test equipment and analysis of result data.

On the other hand, in the past, a test method for restraining other parts and measuring the stiffness was used to test the stiffness of the sidewall, but the test apparatus for measuring the impact absorption force against the dynamic load of the actual tire had a limitation.

In addition, in the case of a shock absorbing force test apparatus (Priority Registration No. 0133099) of a pneumatic tire, which is a known technique, it is the same as a plunger energy measuring apparatus. It is a device that calculates the stiffness through the change of the deformation amount and the load by allowing the tire to absorb the load without widening.

However, this device is limited to the static state and can be measured. As a basic data for analyzing the dynamic characteristics of the tire, that is, the tire characteristics against the dynamically applied load, or the behavior of the tire when it is in contact with the ground plane. There was a drawback with limitations.

Accordingly, the present invention has been invented to solve the above problems, the tire characteristics to measure the energy absorbed by the tire based on the potential energy value of the object having a certain mass characteristics of the tire against the load applied in the dynamic state It is an object of the present invention to provide a device for measuring the dynamic load impact energy absorption force of a tire that can be measured.

1 is a schematic configuration diagram of a measuring device according to the present invention;

Figure 2 is a graph showing the results of measuring the displacement of the load drop in the displacement meter of the measuring apparatus according to the present invention.

-Explanation of symbols for the main parts of the drawings-

1: guide bar 2: drive motor

3: rotating shaft 4: cable

5: displacement meter 6: load dropping part

7: collision member 8: fixed shaft

9: power supply unit 10: recorder

11: tires

The present invention for achieving the above object, the drive motor provided in the upper portion of the guide bar, the rotary shaft extending from the drive motor, the displacement meter installed on the lower portion of the drive motor, the recorder electrically connected to the displacement meter, the rotary shaft and It consists of a load dropping portion connected via a cable, a collision member screwed to the lower portion of the load dropping portion, a fixed shaft attached to the lower portion of the guide bar.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a measuring apparatus according to the present invention, Figure 2 is a graph showing the result of measuring the displacement amount of the load drop in the displacement meter of the measuring apparatus according to the present invention.

The present invention is a drive motor (2) provided in the upper portion of the guide bar (1), a rotating shaft (3) extending from the drive motor (2), a displacement meter (5) installed in the lower portion of the drive motor (2), the displacement meter Recorder (10) electrically connected to (5), the load dropping portion (6) connected via the rotating shaft (3) and the cable (4), the collision screwed to the lower portion of the load dropping portion (6) It consists of a member (7), a fixed shaft (8) attached to the lower portion of the guide bar (1).

Here, the displacement meter 5 is a non-contact measuring means such as a laser or an ultrasonic sensor is used, the drive motor 2 is electrically connected to the power supply (9).

Hereinafter, the operation of the present invention will be described in detail.

After the tire 11 to be tested is mounted on the fixed shaft 8, and the driving motor 2 is rotated by the power applied from the power supply unit 9, the rotating shaft 3 of the driving motor 2 is rotated. While the cable 4 connected to the cable 4 is released, the load dropping part 6 supported by the cable 4 freely falls by gravity, and both sides of the load dropping part 6 are connected to the guide bar 1. Guided and fall down vertically, the collision member 7 of the load dropping portion 6 collides with the upper surface of the tire 11, and the load drop is caused by the elastic repulsive force of the tire 11; The part 6 bounces upwards and then falls again. At this time, the displacement amount of the vertical distance of the load dropping part 6 is measured by the displacement meter 5 and recorded in the recorder 10.

2 is a graph showing the results measured by the displacement meter 5, and the displacement values recorded in the displacement meter 5 are utilized as data necessary for calculating the amount of impact energy absorption.

In addition, since the collision member 7 is screwed with the load dropping portion 6, the collision member 7 may be mounted by changing the weight and shape of the collision member 7 as necessary, for example, to simulate a ground plane. In the case of the test, the test is carried out by screwing the collision member 7 having a larger area than the ground plane of the tire 11 to the load dropping portion 6, and in the case of testing the absorption power of the tire 11 against projections. A collision member 7 having a shape smaller than the tread width of the tire 11 may be screwed onto the load dropping portion 6.

As described above, according to the present invention, it is possible to quantitatively test the measurement of the impact energy absorption of the tire against the dynamic load, and overcome the limitations of the conventional stiffness measuring device, as well as to the projections during driving. Compared with the test apparatus for analyzing the response characteristics of the tire, the dynamic characteristics of the tire can be measured more easily.

Claims (2)

A drive motor 2 provided at the top of the guide bar 1, a rotation shaft 3 extending from the drive motor 2, a displacement meter 5 provided below the drive motor 2, and the displacement meter 5. A recorder 10 electrically connected to the recorder 10, a load dropping part 6 connected through the rotary shaft 3 and a cable 4, a collision member 7 screwed to a lower portion of the load dropping part 6, Dynamic load impact energy absorbing force measuring device of the tire consisting of a fixed shaft (8) attached to the lower portion of the guide bar (1). The apparatus of claim 1, wherein the displacement meter (5) uses a non-contact measuring means.