JP3354907B2 - Control method of brake pressing force and brake torque in brake test, and brake test machine for implementing this method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake test for testing the performance of a brake, in which a force pressing a friction material against a brake drum or a disk (hereinafter referred to as "brake pressing force") and a force applied to the drum or the disk are applied. Controlling the torque (hereinafter referred to as "brake torque") that the friction material receives from the drum or disk,
Also, the present invention relates to a brake tester for performing the method.

[0002]

2. Description of the Related Art In a conventionally known brake testing machine, a brake pressing force and a brake torque are generally controlled by controlling a hydraulic cylinder and a hydraulic motor used as a drive source of the brake pressing force.

However, if hydraulic means is used as the drive source, (a) if there is oil leakage from the hydraulic circuit, the surroundings will be contaminated with oil. (B) The volume of hydraulic oil will change due to temperature changes. Therefore, the output characteristics are not stable. (C) The hydraulic oil deteriorates and needs to be replaced, which is troublesome in terms of maintenance. (D) The hydraulic pump needs to be constantly operated, causing not only power loss but also (E) Equipped with a hydraulic pump or oil tank unit because (e) due to the low response of the servo valve in the hydraulic circuit, there is a surface that cannot follow changes in brake pressing force and brake torque. Requires installation space,
There are many problems.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional brake testing machine, and has been developed in such a manner that a brake pressing force or a brake torque is applied without using a hydraulic drive means as a drive source. It is an object of the present invention to provide a method for controlling them constantly and a brake tester for implementing the method.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for controlling a brake pressing force according to the present invention, in which a rotation of a servomotor is converted into a stroke motion in a brake test. the friction material is paired set the brake disc or drum
It is transmitted to the supported slide shaft and used as the pressing force of the friction material, and the brake pressing force is detected in the stroke motion portion and fed back to the servo amplifier side of the servo motor, and based on this, the servo motor The output is controlled so that the pressing force is constant.

In order to solve the above-mentioned problems, a brake torque control method according to the present invention is configured such that in a brake test, the rotation of a servomotor is converted into a stroke motion, and the stroke motion is applied to a brake disk or a drum. To the slide shaft that supports the installed friction material.
Reached, with use as a pressing force of the friction member, is attached to the friction material by pressing said friction member slides
Detecting a torque received by a bearing portion supporting a shaft as a brake torque and feeding it back to the servo amplifier side of the servo motor, and controlling an output of the servo motor based on the detected torque so that the brake torque is constant. It is characterized by the following.

[0007] The structure of a brake tester for implementing the above control method is a rotary tester having a rotary shaft provided with an inertia body, mounted with a brake disk or drum, and rotated by a drive source such as a motor. Means for holding the friction material, and advancing and retreating means for moving the friction material forward and backward by a driving force to press the friction material against the disk or drum; and acting on the friction material when the friction material is pressed against the disk or drum. In a brake tester provided with a detecting means for detecting a pressing force or a torque, the moving means is a bearing.
The slide shaft supported by allowing only the slide
Formed by a support cylinder supporting the bearings, the driving force of the reciprocating means, feed screw rotation of the electric servo motor and a nut
The linear motion of the nut member converted by the
To the slide shaft and push it to the slide shaft.
A detecting means for detecting an applied force or a torque is provided in association with the detecting means .

[0008]

Next, an embodiment of the present invention will be described with reference to a brake testing machine of the present invention which employs the control method of the present invention. FIG. 1 is a front view showing a part of an example of a brake tester to which the method of the present invention is applied, FIG. 2 is a functional block diagram for explaining control of a brake pressing force of the present invention, and FIG. FIG. 4 is an example of a functional block diagram illustrating the control of the brake torque, and FIG. 4 is another example of a functional block diagram in the control of FIG.

In the brake testing machine of the present invention illustrated in FIG. 1, 1 is a frame of the testing machine, and 2 is the frame 1
In the example shown in the figure, a flywheel mounted on a shaft 4 supported by left and right bearings 3, 3 disposed on the left half of the frame, and a flywheel motor 5 provided inside the frame 1 It is formed so as to be rotated. The flywheel 2 can be mounted by changing the number or weight of the flywheels 2 mounted on the shaft 4 according to the size of the test object.

The tip of the shaft 4 (shaft 4 in FIG. 1)
(Right side) is provided with a servomotor 7 for a static friction test via a gear train and a clutch 6. In addition, this axis 4
A test brake disc 8 or a brake drum 8 (hereinafter, these are simply referred to as discs 8) are detachably attached to the tip (the right end of the shaft 4 in FIG. 1).

On the other hand, on the right half of the frame 1, there is provided a slide shaft 10 supported on a bearing 11 so as to be slidable only in the axial direction on the same axis as the disk 8 and facing the disk 8. A friction material 9 used for a brake pad facing the disk 8 is detachably attached to a tip end of the shaft 10 (left end of the shaft 10 in FIG. 1).

A support cylinder 12 rotatably supports the bearing 11 on its outer peripheral surface, and is mounted on a gantry 13 installed on the upper surface of the frame 1. 14 is the slide shaft 10
The feed screw shaft is disposed on the upper surface of the frame 1 via a bearing 15 in a direction parallel to the shaft. The feed screw shaft includes a nut member 16, and the shaft end is connected to a servomotor 18 via a joint 17.

The nut member 16 is mounted on the slide shaft 10
Is connected via a connection attachment 19. When the nut member 16 moves to the left in FIG. 1 by the rotation of the servo motor 18, the movement is transmitted to the slide shaft 10 via the connection attachment 19, so that the servo motor 18 Axis 10
The friction material 9 attached to the tip of the brake disc 8 is pressed against the brake disc 8.

In the above-mentioned brake tester, when the friction material 9 is pressed against the brake disk 8 (brake pressing force) and when the friction material 9 is pressed against the disk 8, the friction material 9 is attached. In order to detect the torque (brake torque) generated on the slide shaft 10, the following configuration has been added.

In the example shown in the drawing, the mechanism for detecting the brake pressing force has two substantially L-shaped mounting members 20 disposed in the vicinity of the joint between the slide shaft 10 and the attachment 19 in a point-symmetrical manner. Load cell (load sensor) between both members 20, 20
It is formed by inserting Rs. On the other hand, the function of detecting the brake torque is performed by attaching the mounting arm to the bearing 11 of the slide shaft 10.
A receiving member 22 is attached to a portion of the support cylinder 12 supporting the bearing 11 opposite to the distal end 21a of the arm 21, and a torque is provided between the arm distal end 21a and the receiving member 22. It is formed by providing a detection cell (strain sensor) Ds.

In the brake tester provided with the function of detecting the brake pressing force and the function of detecting the brake torque, pressing is performed on the friction material 9 to be tested based on the detected data of the brake pressing force or the detected data of the brake torque. Since the output of the servomotor 18 for applying a force is controlled, this point will be described with reference to FIGS.

Constant control of brake pressing force The flywheel 2 is rotated by the motor 5 to an appropriate programmed rotational speed. A servo motor 18 for generating a brake pressing force on the friction material 9 is started, and the friction material 9 is pressed against the brake disk 8 attached to the shaft 4. The pressing force at this time is detected as an electrical value by the load cell Rs. In the above state, the servomotor is controlled so that the output from the load cell Rs becomes a value indicating an appropriate pressing force programmed in advance.
Control 18 outputs. This control of the motor output is executed by the servo amplifier 18a.

FIG. 2 is a functional block diagram of the above-mentioned constant pressing force control system. In FIG. 2, reference numeral 18a denotes a servo amplifier, and the amplifier 18a has a required program previously programmed in a control unit (not shown). on one of the signal Cs ₁ indicating the instruction value is supplied through the adder-subtractor 18b, the detection signal Fs is an a / D converter the command value in 18c signal Cs of the load cell Rs
Is supplied to the adder / subtractor 18b, and the detection signal Fs from the load cell Rs is converted into a command value signal Cs ₁
The drive of the servo motor 18 is controlled by the amplifier 18a until it becomes equal to.

Constant control of brake torque (constant control of deceleration) The flywheel 2 is rotated by the motor 5 at an appropriate rotational speed programmed in advance. A servo motor 18 for generating a brake pressing force on the friction material 9 is started, and the friction material 9 is pressed against the brake disk 8 attached to the flywheel shaft 4. In the above state, the output of the servomotor 18 is controlled so that the output from the torque detection cell Ds becomes a value indicating an appropriate pre-programmed brake torque.

FIG. 3 is a functional block diagram of the above-mentioned brake torque constant control system. In FIG. 3, Cs ₂ is a drive command value for the servo motor 18, 18d is an adder / subtractor, 1
8e is A / for converting the output signal of the torque detection cell Ds.
This is a D converter, and the control of the servomotor 18 in this control system is executed in the same manner as in the control of the pressing force described above. The control system shown in FIG. 3 may have the configuration of the control system shown in FIG.

In the above control example, the mechanical position of the friction material 9 when the servo motor 18 is started and the output starts from the load cell Rs for detecting the brake pressing force is determined by the friction material 9, the slide shaft 10, Alternatively, it is detected by a component that is connected to and moves together with them, and this position is set as a zero point of the brake wear amount, and the brake wear amount, that is,
By setting a program for detecting the wear amount of the friction material 9, the rotation speed (angle) of the servomotor 18 can be detected and the wear amount of the brake can be detected as numerical data.
If it is indicated that the number of rotations (angle) of the motor 18 has reached the amount of wear allowed for the friction material 9 being tested, the motor
It is possible to perform a test in a form in which the operation of the brake pressing force is stopped by stopping the brake.

When the flywheel shaft 4 and the brake disk 8 are disconnected by the clutch 6, a motor 7 for a static friction test is connected to the disk 8 and driven, and when the disk 8 is rotated, the servo motor 18 is turned on. By driving the friction material 9 to exert a pressing force, the friction material 9
Can be subjected to a static friction test. This static friction test
Since the test can be inserted between the two dynamic brake tests described above, the static test and the dynamic test for the brake are fully automatically performed by a preset test program in such a test configuration. It becomes possible.

[0023]

The present invention is as described above, and the brake pressing force of the brake tester is generated by rotation of the electric servomotor instead of the hydraulic motor or the hydraulic cylinder without using a hydraulic drive system. Thus, there are no problems inherent to the brake test machine using the hydraulic drive system, such as the effect of oil leakage and oil temperature, or the space for replacing hydraulic oil or installing a hydraulic tank.

Further, in the present invention, the brake pressing force is generated by using the rotational force of the electric servomotor, so that the current flows only when the program has an operation command for the motor, and the brake always operates like a hydraulic drive source. Energy saving because it is not
Since no drive noise is generated as in the drive system of a hydraulic motor, the system is quiet, and in addition, the response speed is faster than that of a hydraulic system, so that high control accuracy can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view in which a part of an example of a brake tester to which the method of the present invention is applied is shown in section.

FIG. 2 is a functional block diagram for explaining control of a brake pressing force according to the present invention.

FIG. 3 is a functional block diagram for explaining brake torque control according to the present invention.

FIG. 4 is a block diagram showing another example of the functional block diagram in the control of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brake test machine frame 2 Flywheel 3 Left and right bearing 4 Flywheel shaft 5 Flywheel motor 6 Clutch 7 Servomotor for static friction test 8 Brake disk 9 Friction material 10 Slide shaft 11 Bearing 12 Support cylinder 13 Mount 14 Feed screw shaft 15 Bearing 16 Nut member 17 Joint 18 Servo motor 19 Connection attachment 20 Mounting member 21 Mounting arm 22 Receiving member Rs Load cell Ds Torque detection cell

Claims (3)

(57) [Claims] 1. A brake test, converts the rotation of the servo motor to a stroke motion the stroke movement to support the friction material which is paired set the brake disc or drum
To the slide shaft to use as a pressing force of the friction material, and also to detect a brake pressing force in the stroke movement portion and feed it back to the servo amplifier side of the servo motor, based on which the output of the servo motor is output. Controlling the pressing force so that the pressing force becomes constant. A method for controlling a brake pressing force in a brake test. 2. A brake test, converts the rotation of the servo motor to a stroke motion the stroke movement to support the friction material which is paired set the brake disc or drum
The friction material is transmitted to the slide shaft and used as a pressing force of the friction material, and the friction material is pressed by the friction material.
The torque received by the bearing part supporting the mounted slide shaft is detected as a brake torque and fed back to the servo amplifier side of the servo motor, and based on this, the output of the servo motor is controlled so that the brake torque becomes constant. A method of controlling a brake torque in a brake test, characterized by controlling. 3. A rotating means having an inertia body, a rotating shaft having a disk or drum of a brake attached thereto and rotated by a drive source such as a motor, and a friction material,
Advancing / retracting means for moving the friction material forward and backward by a driving force to press the friction material against the disc or drum; and detecting means for detecting a pressing force or torque acting on the friction material when the friction material is pressed against the disc or drum. a brake testing machine provided with the advancing and retreating means Sly the bearing
Support the slide shaft and the bearing supported
Formed by lifting the support cylinder, the driving force of the moving means is,
The rotation of the electric servo motor is controlled by the feed screw and nut
The linear motion of the converted nut member is transmitted to the slide shaft.
As well as a pressing force on the slide shaft or
A brake tester provided with detection means for detecting torque .