KR102570929B1 - Vehicle brake tester device including a vertical movement type slip bar - Google Patents

Abstract

One embodiment of the present invention relates to a vehicle brake tester device including a vertically movable slip bar, which is a device for testing the brake of a vehicle, and allows for a predetermined displacement of a roller on which a sensor for detecting the operation of the brake is disposed, so that the roller does not break when the vehicle enters or exits.

Description

Vehicle brake tester device including a vertical movement type slip bar {VEHICLE BRAKE TESTER DEVICE INCLUDING A VERTICAL MOVEMENT TYPE SLIP BAR}

The following embodiments are a vehicle brake tester including an up-and-down slip bar in a device for testing brakes of a vehicle, which allows a predetermined displacement of a roller on which a sensor for detecting a brake operation is disposed so that the roller does not break when the vehicle enters or exits. It's about the device.

A roller brake tester is used to test the safety of automobiles.

The roller break tester includes a frame that maintains the skeleton of the entire device, a driving roller connected to the frame, a plate connected to the frame, the plate, and a third roller, a slip bar. , motor and reducer, etc.

In the roller brake tester, a car wheel is seated on a plate between left and right rollers (most European machines do not have a plate), and the brake is applied while the roller rotates at a speed of 2 to 5 km/h by the power of the motor. When stepped on, it is configured to measure the braking force of the vehicle by analyzing the weight measured by the load cell attached to the roller brake tester.

The international standard for rollers used in roller brake testers stipulates that the frictional force generated when a car drives on the road must be secured. To this end, the surface of the roller is coated with stone powder called corundum, The surface of the roller is roughened in order to increase the frictional force between the car tire and the roller of the roller brake tester in such a way as to make a groove on a straight line.

As described above, the roller surface of the roller brake tester is in a very rough (high friction) state, and the braking force is measured by stepping on the brake while forcing the roller to rotate at a speed of 2 to 5 km / h by the motor. Therefore, when the roller continues to rotate even when the brake of the vehicle is operated, the tire of the vehicle may be worn or other parts may be damaged.

Therefore, the slip bar attached to the roller brake tester is equipped with a sensor such as a proximity sensor to prevent the motor from rotating more than necessary when measuring the braking force of the car's brakes. perform a stopping function.

Conventional slip bars are configured to be movable only in one axis direction, up and down, and when the car does not enter the correct position to press the center of the slip bar, there is a problem such as bending or breaking a support bar for fixing the slip bar.

KR 10-2025994 B KR 10-1777024 B KR 10-1629528 B

The problem to be solved by one embodiment of the present invention is to overcome the problems of the conventional brake tester as described above, when the car enters the roller, even if it does not enter the center of the roller and enters biasedly to one side, the slip bar ( 3 rollers) or a structure supporting the slip bar is not deformed/damaged/damaged to provide a vehicle brake tester device including a vertically movable slip bar.

According to one embodiment, a pair of first rollers arranged so that driving wheels of the vehicle are seated; a pair of second rollers spaced apart from the first roller by a predetermined distance; a third roller disposed between the first roller and the second roller and movable according to a load applied from a driving wheel of the vehicle; a load distribution device for moving the third roller according to the load applied from the driving wheel of the vehicle; a first motor supplying power to the first roller or the second roller; a transmission for shifting power applied from the first motor to the first roller or the second roller; a rotation sensor provided on the third roller to detect rotation of the driving wheel of the vehicle; a load cell for measuring the load and braking force of the vehicle; a control unit that is connected to the first motor, rotation sensor, and load cell and measures load and braking force of the vehicle by controlling whether or not the first motor is driven; And a main frame supporting the first roller and the second roller; including, driving the first motor to rotate the driving wheel of the vehicle and then operating the brake of the vehicle to measure the braking force of the brake, Provided is a vehicle brake tester including a vertical sliding slip bar that stops the driving of the first motor based on the measured value of the rotation sensor when the driving wheel of the vehicle stops according to the operation of the brake.

In addition, the load distributing device includes: a first bracket fixed to the main frame with a pair of spaced apart so as to face each other; a pair of first hinges provided on both sides of the lower end of the first bracket; a second bracket pin-coupled to the first hinge; an LM guide fixed to the second bracket; a support rod connected to the LM guide; a base extending from the lower end of the support rod to both sides; a pair of second hinges provided on both sides of the upper end of the second bracket; A pair of springs having one end connected to the second hinge and the other end connected to the base, wherein the third roller is connected to the upper end of the pair of support rods, and the load applied to the third roller Based on, the axis of the third roller may be configured to adjust the angle and height within a predetermined range.

And, a position sensor disposed spaced apart from the first roller and the second roller and measuring the center position of the driving wheel of the vehicle; two pairs of fourth rollers disposed spaced apart from the first and second rollers and on which non-driving wheels of the vehicle are seated; a height adjusting device for adjusting the height of the fourth roller; and a distance adjusting device for adjusting a distance at which the fourth roller is spaced apart from the first roller or the second roller. When: Based on the position sensor, the moving distance, horizontal distance, and vertical distance of the driving wheel of the car are measured according to the operation of the brake of the car, and the moving distance is the hypotenuse, the horizontal distance is the adjacent side, and the vertical distance Calculate a central angle based on a right triangle having a opposite side, and control the height adjusting device such that an angle formed by a straight line connecting the first roller or the second roller and the fourth roller with the ground is the central angle, and the brake It may be configured to re-measure the braking force of the

In addition, the height adjusting device includes: an auxiliary frame formed in a predetermined hexahedral shape and connected to the fourth roller on an upper surface of the hexahedral shape; a support plate disposed to be in contact with both sides of the hexahedral shape; a third hinge disposed below the first roller or the second roller; an angle adjusting bar having one end connected to the third hinge and extending from the third hinge toward the auxiliary frame; A fourth hinge connecting the other end of the angle adjusting bar and the auxiliary frame; and a lifting plate disposed under the auxiliary frame to support the lower surface of the hexahedral shape. An elevating device disposed under the elevating plate to elevate and lower the elevating plate.

In addition, a distance adjusting device for adjusting a distance at which the fourth roller is spaced apart from the first roller or the second roller; further including, wherein the distance adjusting device is provided to replace the angle adjusting bar, and the fourth hinge A first support block connected to; a pair of fixing bars having one end fixed to the first support block; a ball guide fixed to the other end of the fixing bar; a ball screw connected to the ball guide; a second motor rotating the ball screw; and a second support block supporting the second motor and connected to the third hinge.

According to one embodiment, when the vehicle's brakes are applied, the motor driving the rollers can be stopped immediately.

In addition, when the vehicle enters the roller, the slip bar (third roller) or the structure supporting the slip bar is not deformed/damaged/damaged even if the car does not enter the center of the roller but leans to one side.

In addition, when the vehicle body and wheels are separated from the rollers due to delay in stopping of the motor driving the rollers, the vehicle body and wheels may be corrected by tilting the vehicle body to prevent damage to the vehicle body.

In addition, when the vehicle body and wheels are separated from the rollers due to delay in stopping of the motor driving the rollers, the braking force may be re-measured to prevent over or undermeasurement of the braking force.

In addition, the distance between the rollers (first roller and fourth roller) corresponding to the front and rear wheels may be adjusted according to the overall length of the vehicle.

1 is a plan view of a vehicle brake tester including a vertically moving slip bar according to an embodiment of the present invention.
2 and 3 are perspective views showing a portion of an automobile brake tester including a vertical sliding slip bar according to an embodiment of the present invention.
4 is a diagram showing an operation method of a load distributing device of a vehicle brake tester including a vertically moving slip bar according to an embodiment of the present invention.
5 is a view to explain an operating method of a position sensor of a vehicle brake tester device including a vertically moving slip bar according to an embodiment of the present invention.
6 is a view showing a height adjusting device and a distance adjusting device of a vehicle brake tester including a vertically moving slip bar according to an embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes can be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents or substitutes to the embodiments are included within the scope of rights.

Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only, and may be modified and implemented in various forms. Therefore, the embodiments are not limited to the specific disclosed form, and the scope of the present specification includes changes, equivalents, or substitutes included in the technical spirit.

Although terms such as first or second may be used to describe various components, such terms should only be construed for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element.

It should be understood that when an element is referred to as being “connected” to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle.

Terms used in the examples are used only for descriptive purposes and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description will be omitted.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are the same as those commonly understood by one of ordinary skill in the art to which the present invention belongs. It has meaning. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the embodiments of the present invention, an ideal or excessively formal meaning not be interpreted as

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

The size and thickness of each component shown in the drawings are shown for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated components.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, and as those skilled in the art can fully understand, various interlocking and driving operations are possible, and each embodiment can be implemented independently of each other. It may be possible to implement together in an association relationship.

According to one embodiment, a pair of first rollers (R1) disposed so that driving wheels (W) of the vehicle are seated; a pair of second rollers (R2) spaced apart from the first roller (R1) by a predetermined distance; a third roller (R3) disposed between the first roller (R1) and the second roller (R2) and movable according to a load applied from the driving wheel (W) of the vehicle; a load distributing device (2) for moving the third roller (R3) according to the load applied from the driving wheel (W) of the vehicle; a first motor (3) for supplying power to the first roller (R1) or the second roller (R2); a transmission (4) for shifting power applied from the first motor (3) to the first roller (R1) or the second roller (R2); a rotation sensor provided on the third roller (R3) and detecting rotation of the driving wheel (W) of the vehicle; a load cell for measuring the load and braking force of the vehicle; a control unit that is connected to the first motor 3, the rotation sensor, and the load cell and measures the load and braking force of the vehicle by controlling whether the first motor 3 is driven; And a main frame (1) supporting the first roller (R1) and the second roller (R2); including, by driving the first motor (3) to rotate the driving wheel (W) of the vehicle The braking force of the brake is measured by operating the brake of the vehicle, and when the driving wheel (W) of the vehicle is stopped according to the operation of the brake, the first motor 3 operates based on the measured value of the rotation sensor. Provided is a vehicle brake tester including a vertical sliding slip bar that stops driving.

Basic configurations of the first roller R1, the second roller R2, the first motor 3, the transmission 4, the load cell, and the main frame 1 are the same as in the prior art, so detailed descriptions thereof will be omitted.

As shown in Figure 1, the first roller (R1) and the second roller (R2) is disposed spaced apart from each other, supports one driving wheel (W) of the vehicle and rotates the driving wheel.

A pair of the first roller R1 and the second roller R2 is provided to inspect (test) a brake for a pair of driving wheels W of a vehicle.

A first motor 3 is connected to either one of the first roller R1 and the second roller R2 to rotate the driving wheel W of the vehicle, and the other second roller R2 or the first roller ( R1) rotates as the driving wheel W of the vehicle rotates.

When checking the brake, the load cell first measures the weight of the vehicle by measuring the load before driving the first motor 3, and operates the brake of the vehicle while operating the first motor 3 to determine the vehicle's weight. The braking force is measured by measuring the weight in a state in which the driving wheel (W) is completely stopped.

The third roller (R3) rotates in contact with the driving wheel (W) of the vehicle, and the rotational speed of the driving wheel (third roller (R3)) is measured based on the rotation sensor to determine whether the driving wheel is rotating. It can determine whether it is stopped.

The transmission 4 may include a power transmission/power conversion member such as a predetermined gear, a belt-pulley, or a friction wheel.

According to the user's input, the control unit drives or stops the first motor 3, and measures the braking force by measuring the measured value of the load cell for each driving state.

The main frame 1 means a support structure for supporting/fixing members such as the first roller R1 and the second roller R2.

The vertical sliding type slip bar may refer to the third roller R3.

In addition, the load distributing device 2 includes: a first bracket 21 fixed to the main frame 1 by spaced apart so that a pair faces each other; a pair of first hinges 210 provided on both sides of the lower end of the first bracket 21; a second bracket 22 pin-coupled to the first hinge 210; an LM guide 23 fixed to the second bracket 22; a support bar 24 connected to the LM guide 23; A base 240 extending from the lower end of the support bar 24 to both sides; a pair of second hinges 220 provided on both sides of the upper end of the second bracket 22; A pair of springs 25 having one end connected to the second hinge 220 and the other end connected to the base 240; including, but the third roller R3 is a pair of support rods 24 ), and based on the load applied to the third roller (R3), the axis of the third roller (R3) may be configured to adjust the angle and height within a predetermined range.

2 to 4 show the structure and driving principle of the load distributing device 2.

A pair of first brackets 21 are fixed to the main frame 1 .

Since the load distributing device 2 is provided for each third roller R3, in the embodiment of the present invention, a total of four (two pairs) of first brackets 21 are paired to the main frame 1 fixed on

The first bracket 21 rotates the second bracket 22 around the first hinge 210 .

As shown in FIG. 4 (b), when the driving wheel W of the vehicle presses the lateral part of the third roller R3, the inclined third roller R3 and the support rod 24 etc. The second bracket 22 is inclined about the first hinge 210 .

The LM guide 23 is fixed to the second bracket 22 and driven integrally, and is transported in the vertical direction along the support bar 24.

The support bar 24 moving relative to the LM guide 23 moves downward by the load transmitted from the driving wheel W of the vehicle, and the LM guide 23 is attached to the main frame 1 maintained at a fixed height. However, the LM guide 23 may be inclined by a predetermined angle by the second bracket 22 and the first hinge 210 .

The base 240 is formed by extending from the lower end of the support bar 24 in both lateral directions.

According to the structure as described above, the third roller (R3) naturally descends downward without enduring the load of the vehicle, and returns to the top by the elastic force of the spring 25 when the load of the vehicle is removed.

And, a position sensor disposed spaced apart from the first roller (R1) and the second roller (R2) and measuring the center position of the driving wheel (W) of the vehicle; two pairs of fourth rollers disposed spaced apart from the first roller (R1) and the second roller (R2) and on which the non-driving wheels of the vehicle are seated; a height adjusting device for adjusting the height of the fourth roller; and a distance adjusting device for adjusting a distance at which the fourth roller is spaced apart from the first roller (R1) or the second roller (R2). When the moving distance (d) exceeds a predetermined reference value: The moving distance (d) and the horizontal distance (w) of the driving wheel (W) of the vehicle according to the operation of the brake of the vehicle based on the position sensor And the vertical distance (h) is measured, and the central angle (A) is determined based on a right triangle (T) in which the moving distance (d) is the hypotenuse, the horizontal distance (w) is the adjacent side, and the vertical distance (h) is the opposite side. Calculate, and control the height adjusting device so that the angle formed by the straight line connecting the first roller (R1) or the second roller (R2) and the fourth roller with the ground is the center angle (A), the braking force of the brake It can be configured to re-measure.

As shown in FIG. 5 , the position sensor photographs the driving wheel W of the vehicle from the side, and the control unit recognizes/detects the central point of the driving wheel W of the vehicle based on the captured image.

Among the four wheels of a vehicle, a driving wheel (based on a two-wheel drive vehicle) is seated between the first roller (R1) and the second roller (R2), and a non-driving wheel is seated on the fourth roller.

A separate motor is not connected to the fourth roller, and is provided to simply support the non-driving wheel.

The height adjusting device adjusts the height of the fourth roller to lower the height of the fourth roller when the vehicle deviates from the first roller R1 and the second roller R2 to start the vehicle and vehicle parts. damage can be prevented.

The distance adjusting device adjusts the distance from the first roller (R1) or the second roller (R2) to the fourth roller, so that brakes can be inspected for various vehicles with different overall lengths.

As shown in Figure 5, when the driving wheel (W) of the vehicle receives the rotational force from the first roller (R1) and moves in the left direction in Figure 5 (W'), the center point after moving from the center point before moving The movement distance (d), the horizontal distance (w) and the vertical distance (h) are respectively measured.

A central angle (A) is calculated based on an inverse trigonometric function for a right triangle (T) in which the moving distance (d) is the hypotenuse, the horizontal distance (w) is the adjacent side, and the vertical distance (h) is the opposite side.

Thereafter, the height of the fourth roller is adjusted according to the central angle A, and at this time, since the braking force is likely to be over or undermeasured, control to re-measure the braking force (re-drive the first motor 3 )do.

In addition, the height adjusting device includes: an auxiliary frame 5 formed in a predetermined hexahedral shape and connected to the fourth roller on an upper surface of the hexahedral shape; a support plate 6 disposed to be in contact with both sides of the hexahedral shape; a third hinge 10 disposed below the first roller R1 or the second roller R2; An angle adjusting bar having one end connected to the third hinge 10 and extending from the third hinge 10 toward the auxiliary frame 5; A fourth hinge 50 connecting the other end of the angle adjusting bar and the auxiliary frame 5; and a lifting plate 51 disposed under the auxiliary frame 5 to support the lower surface of the hexahedral shape. An elevating device 52 disposed under the elevating plate 51 to elevate and lower the elevating plate 51 .

The driving principle of the height adjusting device is shown in FIGS. 6 (a) and 6 (b).

During measurement (horizontal state), the first roller (R1), the second roller (R2), and the fourth roller are all located at the same height as shown in FIG. As shown in b), the auxiliary frame 5 rotates around the third hinge 10 and descends.

Since the elevating device 52 follows the structure of a general hydraulic lift, a detailed description thereof will be omitted.

The support plate 6 shown in FIG. 6 (a) performs a function of preventing the auxiliary frame 5 from leaving in the left and right directions.

The third hinge 10 is spaced apart from the lower portions of the first roller R1 and the second roller R2 by a predetermined distance and is fixed to the main frame 1 .

In one embodiment, the angle adjustment bar is configured in the form of a long axis, and in an embodiment provided with a distance adjusting device, it may be configured in a structure described later.

An auxiliary frame 5 is seated on the upper part of the lifting plate 51, and the height of the auxiliary frame 5 is adjusted as the lifting plate 51 rises or falls. At this time, since the auxiliary frame 5 rotates around the third hinge 10, the distance between the first roller R1 and the second roller R2 and the fourth roller is maintained constant, so Accordingly, the front and rear wheels of the vehicle remain seated on the first roller R1, the second roller R2, and the fourth roller, respectively.

In addition, a distance adjusting device for adjusting the distance at which the fourth roller is spaced apart from the first roller (R1) or the second roller (R2); further includes, the distance adjusting device: provided to replace the angle adjusting bar and a first support block 53 connected to the fourth hinge 50; a pair of fixing bars 54 having one end fixed to the first support block 53; A ball guide 55 fixed to the other end of the fixing bar 54; a ball screw 56 connected to the ball guide 55; a second motor rotating the ball screw 56; and a second support block 57 supporting the second motor and connected to the third hinge 10 .

The driving principle of the distance adjusting device is shown in FIGS. 6 (a) and 6 (c).

When the overall length of the vehicle to be measured is relatively long, the distances between the first roller R1, the second roller R2, and the fourth roller are adjusted to be relatively long, as shown in FIG. When this is relatively short, the distance between the first roller R1, the second roller R2, and the fourth roller is adjusted to be relatively close, as shown in FIG. 6 (c).

When the second motor is rotated, the ball screw 56 connected to the ball guide 55 gradually enters or leaves the space between the fixing bars 54, and the third hinge 10 and the fourth hinge The distance between (50) is shortened or increased.

The second motor is maintained in a locked state during measurement of a vehicle.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

W: driving wheel of a car
R1: 1st roller
R2: 2nd roller
R3: 3rd roller
1: main frame
10: third hinge
2: Load Distributor
21: first bracket
210: first hinge
22: second bracket
220: second hinge
23: LM Guide
24: support bar
240: base
25: spring
3: 1st motor
4 : Transmission
5 : Auxiliary frame
50: fourth hinge
51: lifting plate
52: lifting device
53: first support block
54: fixed bar
55: ball guide
56: ball screw
57: second support block
6: support plate
d: travel distance
w: horizontal distance
h : vertical distance
T : right triangle
A: central angle

Claims (3)

delete a pair of first rollers arranged to seat driving wheels of a vehicle;
a pair of second rollers spaced apart from the first roller by a predetermined distance;
a third roller disposed between the first roller and the second roller and movable according to a load applied from a driving wheel of the vehicle;
a load distributing device for moving the third roller according to the load applied from the driving wheel of the vehicle;
a first motor supplying power to the first roller or the second roller;
a transmission for shifting power applied from the first motor to the first roller or the second roller;
a rotation sensor provided on the third roller and detecting rotation of the driving wheel of the vehicle;
a load cell for measuring the load and braking force of the vehicle;
a control unit that is connected to the first motor, rotation sensor, and load cell and measures load and braking force of the vehicle by controlling whether or not the first motor is driven; and
A main frame supporting the first roller and the second roller; including,
Driving the first motor to rotate the driving wheel of the vehicle and then operating the brake of the vehicle to measure the braking force of the brake;
Stopping the driving of the first motor based on the measured value of the rotation sensor when the driving wheel of the vehicle stops according to the operation of the brake;
The load distributing device is:
A first bracket fixed to the main frame with a pair spaced apart so as to face each other;
a pair of first hinges provided on both sides of the lower end of the first bracket;
a second bracket pin-coupled to the first hinge;
an LM guide fixed to the second bracket;
a support rod connected to the LM guide;
a base extending from the lower end of the support rod to both sides;
a pair of second hinges provided on both sides of the upper end of the second bracket;
A pair of springs having one end connected to the second hinge and the other end connected to the base;
The third roller is connected to the upper end of the pair of support rods,
Based on the load applied to the third roller, the angle and height of the axis of the third roller are adjusted within a predetermined range,
Vehicle brake tester device including a vertical movement type slip bar a pair of first rollers arranged to seat driving wheels of a vehicle;
a pair of second rollers spaced apart from the first roller by a predetermined distance;
a third roller disposed between the first roller and the second roller and movable according to a load applied from a driving wheel of the vehicle;
a load distributing device for moving the third roller according to the load applied from the driving wheel of the vehicle;
a first motor supplying power to the first roller or the second roller;
a transmission for shifting power applied from the first motor to the first roller or the second roller;
a rotation sensor provided on the third roller and detecting rotation of the driving wheel of the vehicle;
a load cell for measuring the load and braking force of the vehicle;
a controller connected to the first motor, rotation sensor, and load cell to measure load and braking force of the vehicle by controlling whether the first motor is driven; and
A main frame supporting the first roller and the second roller; including,
Driving the first motor to rotate the driving wheel of the vehicle and then operating the brake of the vehicle to measure the braking force of the brake;
Stopping the driving of the first motor based on the measured value of the rotation sensor when the driving wheel of the vehicle stops according to the operation of the brake;
a position sensor disposed apart from the first roller and the second roller and measuring a center position of a driving wheel of the vehicle;
two pairs of fourth rollers disposed spaced apart from the first and second rollers and on which non-driving wheels of the vehicle are seated; and
A height adjusting device for adjusting the height of the fourth roller; includes,
The control unit:
When the moving distance of the driving wheel of the vehicle exceeds a predetermined reference value:
Based on the position sensor, measuring the moving distance, horizontal distance and vertical distance of the driving wheel of the car according to the operation of the brake of the car,
Calculating a central angle based on a right triangle having the moving distance as the hypotenuse, the horizontal distance as the adjacent side, and the vertical distance as the opposite side;
Controlling the height adjusting device so that an angle formed by a straight line connecting the first roller or the second roller and the fourth roller with the ground is the central angle,
Re-measuring the braking force of the brake,
Vehicle brake tester device including a vertical movement type slip bar