WO2019017529A1

WO2019017529A1 - Apparatus for testing braking force of tire

Info

Publication number: WO2019017529A1
Application number: PCT/KR2017/011743
Authority: WO
Inventors: 유영석
Original assignee: (주)스케일트론
Priority date: 2017-07-20
Filing date: 2017-10-23
Publication date: 2019-01-24
Also published as: CN109642854B; CN109642854A; KR101896670B1

Abstract

The present invention comprise: a trailer main body (10) installed at the tail of a towing vehicle so as to be towed, and provided with a water tank (57) on a selected area on the upper surface, and with a tire measurement space (13) in a middle part of the trailer main body (10); a test tire measurement portion (20) installed in the tire measurement space (13) in the trailer main body (10), and provided with a measuring wheel (21) to which a brake means is coupled for mounting and measuring the performance of a test tire (22); a load-applying means installed between the trailer main body (10) and the test tire measurement portion (20) so as to be above the test tire measurement portion (20), for applying vertical weight to the test tire (22) installed on the measuring wheel (12); a load cell (40) for measuring tension on the test tire according to the load applied by the load-applying means (30); a water spraying portion (50) installed in front of the measuring wheel (21) for receiving water from the water tank (57) and spraying water on a road surface on front of the test tire (22) so as to provide a wet road surface; a balance rod (60) of which two end parts are installed between one side surface of the trailer main body (10) defining the tire measurement space (13) and the test tire measurement portion (20) so as to be respectively rotatable by a hinge (61), and which is provided in a plurality in vertical alignment so as to guide the test tire measurement portion (20) in the vertical and horizontal directions; a tension member (70) installed on one portion of an upper part on the rear side of the test tire measurement portion (20) to maintain tension by supporting the test tire measurement portion (20) with uniform pressure; and a control portion for receiving measurement information from the load cell (40) and controlling the load-applying means (30) and the water spraying portion (50).

Description

Tire braking force test equipment

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for testing a braking force of a tire, and more particularly, And to a braking force test apparatus for a tire which can increase the measurement accuracy.

The tire efficiency rating system measures the rotation resistance of the tire and the wet road surface braking force and grades it. It is a system that allows the consumer to select a high-efficiency tire. It is attached to the surface of the tire or printed on the side .

Here, the rotational resistance is graded by friction force measurement, and the wet road surface braking force is obtained by braking the tire arbitrarily, thereby grading the efficiency of the tire by measuring the braking distance.

As a technique for measuring the wet road surface braking force, a measurement device consisting of a built-in vehicle type, which is slightly different depending on the manufacturer and the end user, but is generally built in a trailer type or bus type vehicle, is used , And a method of measuring the traction performance of the tire while driving the vehicle while the test tire is mounted on the measuring device (locking) is used.

Japanese Patent Registration No. 5855424 and Korean Utility Model Laid Open Publication No. 2012-0002031 disclose a technique for a traction measuring apparatus for a tire.

Japanese Patent Laid-Open Publication No. 2001-342995 discloses a tire having a measuring wheel for mounting a test tire, a load applying means for applying a load to the measuring wheel, a water spraying portion for spraying water on the front side of the test tire, A water tank is installed on the upper rear surface of the main body.

However, the above-described patent fails to effectively disperse the pressure generated at the sudden stop due to the support of the measurement wheel by only the vertical frame, and also it is difficult to stably support the measuring wheel, the vertical frame, Etc.), and there is a possibility of a safety accident.

In addition, since the structure is supported only by the vertical frame, it is difficult to achieve accurate measurement results as the horizontal dimension of the measurement wheel is not accurate.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a tire testing apparatus in which a plurality of balance rods are horizontally installed in a vertical direction, The present invention provides a tire braking force test apparatus capable of performing a braking force test with high accuracy irrespective of the diameter of a tire, by maintaining the test tire measuring section in a horizontal state by a balance rod.

In order to accomplish the above object, the present invention provides a trailer (hereinafter referred to as a " trailer ") having a structure in which a water tank 57 is installed on a top- 10); A test tire measuring unit 20 installed in the tire measuring space 13 of the trailer body 10 and provided with a measuring wheel 21 equipped with brake means for measuring the performance of mounting and performance of the test tire 22; A vertical load is applied to the test tire 22 installed between the trailer body 10 and the test tire measurement unit 20 so as to be positioned above the test tire measurement unit 20, Load applying means (30); A load cell 40 for measuring a tensile force applied to the test tire according to the load applied by the load applying means 30; A water distributor 50 installed in front of the measuring wheel 21 to receive water from the water tank 57 and spray water on the front road surface of the test tire 22 to provide a wet road surface; Both end portions of the test tire measuring portion 20 are fixed to one side of the trailer main body 10 forming the tire measuring space 13 by hinge shafts 61, A balance rod 60 for guiding the test tire measurement unit 20 to be horizontally and vertically moved; A tension member 70 installed on a part of the upper side of the rear side of the test tire measurement unit 20 to support the test tire measurement unit 20 at a constant pressure to maintain tension; And a controller 80 for receiving measurement information from the load cell 40 and for controlling the load applying unit 30 and the water dispersing unit 50.

According to the tire braking force testing apparatus configured as described above, since the test tire measurement unit is held horizontally by the balance rod and is stably supported, the pressure generated at the sudden stop is dispersed, It is possible to test the braking force regardless of the diameter of the test tire.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a braking-force testing apparatus for a tire according to the present invention;

FIG. 2 is a perspective view showing a test tire measuring unit provided with a balance rod, a load applying unit and a tension member in the braking force testing apparatus of a tire according to the present invention,

Fig. 3 is an installation state of the load applying means according to the present invention,

Fig. 4 is a view showing a mounting state of the balance rod according to the present invention,

5 is a state in which a test tire having a small diameter is mounted on a measuring wheel according to the present invention,

FIG. 6 is a view showing a state in which a test tire having a large diameter is mounted on a measuring wheel according to the present invention,

7 is a sectional view of the injection nozzle according to the present invention,

8 is a connection configuration diagram of a control unit in an apparatus for testing a braking force of a tire according to the present invention.

Hereinafter, an apparatus for testing a braking force of a tire according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 8, the braking force testing apparatus for a tire according to the present invention includes a trailer main body 10, which is installed at a trailing end of a traction vehicle and has a tire measuring space 13 at an intermediate portion thereof, A test tire measurement unit 20 provided in a measurement space 13 and provided with a measurement wheel 21 on which a test tire 22 is mounted; A load cell 40 for measuring the tension applied to the test tire in accordance with the load applied by the load applying means 30; A water spraying part 50 which receives water from the water tank 57 and injects water onto the front road surface of the test tire 22 to provide a wet road surface, A balance rod 60 installed so as to be connected to the main body 10, A tension member 70 installed at a part of an upper portion of the rear side of the test tire measuring unit 20 to support the test tire measuring unit 20 at a predetermined pressure; And a control unit (80) for controlling the means (30) and the water splashing unit (50).

The water tank 57 is installed on the top surface of the trailer main body 10, and a heavy object (not shown) for raising the weight of the trailer main body can be loaded.

The water tank 57 is provided on the upper surface of the trailer body 10 in front of the rear of the trailer body 10 to minimize swelling of water stored therein, thereby preventing a leaning or swinging that may be caused thereby to accurately measure the braking force, Thereby preventing slippage in the left and right directions.

It is a matter of course that a pump (not shown) is provided at one side of the water tank 57 so as to pump the water and supply the water to the water splitting unit 50 connected through the hose.

It is preferable that the heavy object is loaded so as not to exceed the weight of the trailer body 10. [ Assuming that the weight of the trailer body 10 is 6 tons, for example, the weight of the trailer body 10 is set to 6 tons or less. This is because when the heavy object is heavier than the trailer main body 10, the trailer body can not bear the weight of the heavy object due to the sudden stoppage, so that the trailer body can slip in the left and right direction, There is a possibility that the connection part of the battery is damaged.

In the present invention, it is preferable that the intermediate portion of the trailer main body 10 is connected to the support frame 12 so that the tire measurement space 13 is formed therebetween, and the support frame 12 is disposed on the upper side And a tire measurement space is formed at the lower side thereof so that the test tire measurement unit 20 can be installed.

The supporting frame 12 is formed in a substantially U shape and the load applying means 30 is installed on the supporting frame 12. [

The test tire measuring unit 20 is provided with a measuring wheel 21 on both sides or one side to which a test tire is mounted. The measuring wheel 21 is provided with a brake means Respectively.

The brake means has the same structure as that of a brake device mounted on an ordinary automobile wheel.

The load cell 40 measures the tension applied to the test tire and is provided on the measuring wheel 21. [

The water distributing unit 50 is installed to supply water stored in the water tank and spray the water on the road surface in front of the test tire to provide a wet road surface. The water distributing unit 50 discharges water supplied from the water tank 57 to the road surface And an opening / closing valve 55 for controlling the spraying of water through the injection nozzle 51. The opening /

The injection nozzle 51 is formed by expanding the hose 56 connected to the water tank 57 to one side and widening the width of the test tire 22 on the other side, A plurality of nozzles 52 are formed in the nozzle body 52 to divide the water introduced into one side of the nozzle body through the hose 56 and guide the divided water to the other injection hole And a split partition plate 54.

As the split partition plate 54 is installed, water is uniformly sprayed on the front road surface of the test tire, so that the dry portion is not present on the road surface where the test tire is grounded, thereby improving the accuracy of the measurement of the braking force on the wet road surface.

At this time, the injection nozzle 51 is rotatably coupled to the trailer body 10 by a hinge shaft, and an angle adjusting cylinder 58 is installed at one side of the injection nozzle.

Accordingly, the angle of the injection nozzle can be adjusted by the operation of the angle-adjusting cylinder 58 to determine the position of the injection nozzle. The control of the angle of the injection nozzle is controlled by the control unit according to the road surface condition or test condition.

The balance rod 60 is installed between one side of the trailer main body 10 forming the tire measurement space 13 and the test tire measuring unit 20. The balance rod 60 is fixed to one side of the trailer main body 10, The balance rods 60 are hingedly coupled to the hinge shafts 61 so that the balance rods 60 are rotatable. At least two or more balance rods 60 are provided, In this state, the test tire measuring unit 20 is guided to be horizontally moved when vertically moving.

The reason why the balance rod 60 is pivotally mounted is that the test tire measuring unit is moved up and down in a horizontal state to be mounted and tested even if there is a difference in the diameter of the test tire 22 mounted on the measuring wheel 21 In order to make it possible.

In particular, since the balance rod 60 is provided, the vertical load by the load applying unit can be accurately given to the test tire by moving the test tire measuring unit 20 horizontally in the vertical direction, .

In addition, since the test tire measuring unit 20 is supported by the balance rod 60, it is possible to prevent breakage of the load applying unit at the time of sudden stop of the towing vehicle and to prevent breakage of the parts constituting the test tire measuring unit .

One side of the test tire measurement unit 20 is coupled to the guide frame 25 fixed to the trailer body 10 to prevent the test tire from slipping in the left and right direction during the stoppage to measure the braking force, In a state in which it is supported by the supporting member.

The tension member 70 is installed at a portion of the upper portion of the rear side of the test tire measuring unit 20 and is configured to support the test tire measuring unit 20 at a constant pressure to maintain the tension.

Such a tension member 70 is configured to give a buffering effect so that the test tire is instantly restored when the test tire is displaced upward due to bending of the road surface or a foreign substance such as stone in a state where a load is applied to the test tire . Therefore, it is possible to accurately test even if the road surface is irregular or foreign matter exists.

As an example of the tension member 70, an air show bar or an air spring cylinder can be used, and it is preferable that the tension member 70 is designed to withstand an instantaneous tensile load of about 10 tons when used in a tire braking force test apparatus for a large vehicle.

In the process of testing the braking force of the tire using the tire braking force test apparatus of the present invention constructed as described above, the load applying means is operated to raise the measuring wheel, the test tire is mounted on the measuring wheel, Thereafter, the load applying means is operated to lower the measuring wheel so that the test tire is brought into close contact with the ground, and then the load is applied as desired.

In order to measure the braking force of the tire on the wet road surface in this state, the traction vehicle is operated and the water is sprayed on the road surface at the desired speed, and then the brake is actuated at the measuring point. As a result of the sudden stop, not only the test tire but also the tire of the trailer wheel installed on the trailer body 10 are undrawn while being braked together, and the braking force on the wet road surface against the test tire is measured.

Of course, when measuring on a normal road surface rather than a wet road surface, the road surface can be tested without spraying water.

The balance rod 60 or the test tire measuring unit 20 is provided with a level sensor 65 for detecting the horizontal state of the balance tire or the test tire measuring unit and transmitting the sensing information to the controller 80 do.

The controller 80 analyzes the sensed information transmitted from the level meter 65 and informs the operator of the sensed information through an alarm unit (alarm, lamp on or blinking) when it is determined that the inclination is generated.

Of course, you can tell the driver in addition to the operator (tester).

Since the leveling rod 65 is installed, it is possible to adjust the level of the balance tire or the test tire measuring unit 20 accurately, thereby improving the accuracy and adjusting the level of the test tire 20 more easily than the leveling through the naked eye have.

The load applying means 30 of the present invention includes a support plate 31 hingedly mounted on a support frame 12 provided on the tire measurement space 13 of the trailer body 10, And an actuator 32 mounted vertically downward to the test tire measurement unit 20 and hinged to one side of the upper portion of the test tire measurement unit 20 to give a load to the test tire 22 .

Since the rods of the support plate 31 and the actuator 32 are hingedly coupled to the support frame 12 and the test tire measurement unit 20 so that the diameter of the test tire mounted on the measurement wheel is small or large It is possible to effectively mount the test tire without damaging the parts.

The actuator 32 is configured to apply a load to the test tire measurement unit 20 to apply a load to the test tire mounted on the measurement wheel, and a hydraulic cylinder or a motor can be used.

According to the present invention configured as described above, the balance rod 60 is connected to the front surface of the test tire measurement unit 20, and a tension member 70 is provided on a part of the upper side of the rear side, (Connecting frame, load applying means) including the measuring wheel can be stably supported, the damage and damage of the measuring parts can be reduced by maintaining the tension, and accurate braking force measurement can be performed accordingly .

Claims

A trailer body 10 installed at a trailing end of the towing vehicle, having a water tank 57 at an upper surface selecting portion and a tire measuring space 13 at an intermediate portion thereof;

A test tire measuring unit 20 installed in the tire measuring space 13 of the trailer body 10 and provided with a measuring wheel 21 equipped with brake means for measuring the performance of mounting and performance of the test tire 22;

A vertical load is applied to the test tire 22 installed between the trailer body 10 and the test tire measurement unit 20 so as to be positioned above the test tire measurement unit 20, Load applying means (30);

A load cell 40 for measuring a tensile force applied to the test tire according to the load applied by the load applying means 30;

A water distributor 50 installed in front of the measuring wheel 21 to receive water from the water tank 57 and spray water on the front road surface of the test tire 22 to provide a wet road surface;

Both end portions of the test tire measuring portion 20 are fixed to one side of the trailer body 10 forming the tire measurement space 13 by hinge shafts 61, A balance rod 60 for guiding the test tire measurement unit 20 to be horizontally and vertically moved;

A tension member 70 installed on a part of the upper side of the rear side of the test tire measurement unit 20 to support the test tire measurement unit 20 at a constant pressure to maintain tension;

A controller 80 for receiving measurement information from the load cell 40 and for controlling the load applying unit 30 and the water dispersing unit 50;

And a braking device for braking the tire.
The method according to claim 1,

A leveling unit 65 for detecting the level of the test tire measuring unit 20 and transmitting the sensing information to the control unit 80 is installed at one side of the balance rod 60 or the test tire measuring unit 20 ,

Wherein the controller (80) analyzes the sensing information transmitted from the level meter (65), and notifies the operator of the tire information through the notifying means when it is determined that the inclination has occurred.
The method according to claim 1,

The load applying means 30 includes a support plate 31 hingedly mounted on a support frame 12 provided on the upper side of the tire measurement space 13, And an actuator (32) hinged to one side of the upper portion of the test tire measurement unit (20) to provide a load to the test tire (22).
The method according to claim 1,

The water distributing unit 50 includes an injection nozzle 51 installed in front of the test tire for spraying the water supplied from the water tank 57 onto the road surface and a control unit for controlling the injection of water through the injection nozzle 51 Closing valve (55)

The injection nozzle 51 is formed by expanding the hose 56 connected to the water tank 57 to one side and widening the width of the test tire 22 to the other side, A plurality of water nozzles 52 provided in the nozzle body 52 for dividing the water introduced into one side of the nozzle body through the hose 56 and guiding the divided water to the other injection hole, And a diaphragm (54).