JP2576313B2 - Inertial brake testing machine for test pieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inertial brake tester for a test piece used in a friction test of a disc pad used for braking an automobile.

[0002]

2. Description of the Related Art A dynamometer test method for testing friction characteristics of a disk pad for an automobile is established by the Japanese Automotive Standard (JASO). However, since the dynamometer test method drives an inertial disk having an inertial moment acting on one wheel of a real vehicle, the method is large and not economical.

Therefore, the area A of the disk pad is 1 / N (N> 1) of the actual vehicle, the inertia moment I is 1 / n ^{2 of the} inertia moment acting on one wheel of the actual vehicle, and the angular velocity ω of the disk rotor is √ of the actual vehicle. A method has been conceived in which the energy absorption amount per unit area E (= Iω ² / A) is made equal to that of the actual vehicle as N, and the friction speed and the pressing pressure are made to match those of the actual vehicle to realize the friction characteristics of the actual vehicle.

That is, the above-described inertial brake tester for a test piece is a horizontal drive motor, a clutch, a mechanism for transmitting a torque of the motor, and a horizontal disk having an inertial disk having the above-mentioned moment of inertia fixed thereto. A rotating shaft, a disk rotor fixed to one end of the rotating shaft, a disk pad having the area for pressing both surfaces of the disk rotor,
It consists of a brake caliper that transmits pressure to the test piece disk pad.

[0005]

However, in the conventional inertial brake tester for a test piece, since the driving motor and the rotating shaft are installed horizontally, an ultra-high speed, for example, 3
When a brake test of 00 Kmm / hr is performed, the rotating shaft is deflected by its own weight, causing blur, and accurate rotation cannot be obtained. Therefore, there is a problem that an accurate brake test cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended to reduce the space and to perform the brake test up to an ultra-high speed corresponding to high speed and high performance. It is an object of the present invention to provide an inertial brake tester for a test piece that can reduce blur and obtain accurate rotation and rotation speed.

[0007]

The structure of the present invention for solving the above-mentioned object will be described with reference to FIGS. 1 and 2 corresponding to an embodiment. The present invention relates to a disk rotor having a vertical rotating shaft and a disk rotor. The floating brake caliper is installed so that the surface is horizontal, and the test piece disk pad is installed so that it presses the upper and lower surfaces of the disk rotor, and has a mechanism to lift the upper test piece disk pad and hydraulic cylinder. It is characterized by having been provided.

FIG. 1 is a schematic side view showing the entire structure of the present invention, and FIG. 2 is a side view of a main part of FIG. 6a and 6b are rotary shafts, 6a is a drive shaft, and 6b is a driven shaft, each of which is provided vertically. Reference numeral 10 denotes a disk rotor, the surface of which is mounted horizontally. Reference numeral 12 denotes a hydraulic cylinder lifting air cylinder. Drive shaft 6a,
Pulleys 4a and 4b are attached to the driven shaft 6b, respectively, and the torque of the motor 1 is applied to the driven shaft 6a by the belt 7 from the driven shaft 6a.
Tell b. Here, the pulleys 4a and 4b have a radius ratio, that is, (the radius of the pulley 4a) / (the radius of the pulley 4a) such that (the rotation speed of the drive shaft 6a) / (the rotation speed of the driven shaft 6b) is smaller than 1.
(The radius of the pulley 4b) is set to be larger than 1.
Also, there are V belt, flat belt and stepped belt as the belt, but in order to control the rotation by controlling the eddy current,
A stepped belt that accurately transmits the rotation of the motor is preferable.

[0009] the drive shaft 6a is bearing 3a, the 3b, the driven shaft 6b bearings 8a, 8b, are respectively supported on 8c, the inertia disc 9 having a moment of inertia of the 1 / N ² of the vehicle is fixed to the driven shaft 6b ing. As shown in FIG. 2, a disk rotor 10 is horizontally mounted on the upper end of the driven shaft 6b, and disk pads 20a and 20b are held by calipers so as to sandwich the disk rotor 10. The disk pads 20a, 20b press both surfaces of the disk rotor 10 with the same pressure as the actual vehicle by the hydraulic cylinder 18 in the caliper 11. After braking is completed, the disk pad 20a
The caliper 11 is provided with a mechanism for lifting the hydraulic cylinder 18 in order to prevent drag of the hydraulic cylinder 18. Although it is easy to use a spring as this pulling-up mechanism, if a mechanism for pulling up the hydraulic cylinder using the air cylinder 12 is configured to release air when pressure is applied to the hydraulic cylinder, the friction coefficient is increased. It is preferable because the test piece pressing pressure for deriving the pressure can be easily known by hydraulic pressure.

The mechanism for fastening the disk pad holding member 19 and the hydraulic cylinder 18 has a structure in which the distance between the disk pad holding member 19 and the hydraulic cylinder 18 is widened to absorb the inclination of the test piece. Even if the piece is unevenly worn, it is preferable because no extra force is applied to the hydraulic cylinder 18. Disk pads 20a, 20b
Is set to 1 / √N of the actual vehicle in order to make the friction speed equal to that of the actual vehicle.

The caliper 11 is fixed to a holding shaft 16 supported by bearings 13a and 13b. Holding shaft 1
6 has an arm 1 with a load cell 15 attached to the end.
4 is fixed, and serves as a mechanism for measuring a frictional force generated when the disk pad 20 presses the disk rotor 10.

[0012]

When the test piece inertial brake tester of the present invention performs a brake test at an ultra-high speed corresponding to the recent increase in speed and performance of an automobile, in the present invention, the rotating shaft is vertical and the disk rotor surface is horizontal. (Vertical installation), so the installation floor area is about 1/2 compared to the conventional test piece inertial brake tester in which the motor and rotating shaft are installed horizontally (horizontal installation) In addition, the space is reduced, and the rotating shaft does not bend under its own weight, so that blurring is reduced and the rotation is stabilized.

However, by changing from horizontal to vertical,
Although the problem of dragging the upper disk pad occurs, the present invention uses a brake caliper having a mechanism for lifting the hydraulic cylinder at the top, and fixes the disk pad to the hydraulic cylinder, so that the disk pad can be dragged even in a vertical type. This makes it possible to create an inertial brake tester for test pieces without a test piece. Although an opposed piston type may be used as a brake caliper, if a hydraulic cylinder pulling-up mechanism is installed on the upper part, the brake caliper becomes large, so it is not suitable for a test piece test machine.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In an embodiment of the present invention, the moment of inertia 44Kg ² acting on one wheel, the maximum rotational speed of the wheels 2723Rpm,
Area of the disc pad 77cm ^2, pressing pressure is 3
The test was performed under the condition of 1/5 (N = 5) of a 4 kg / cm ² actual vehicle.

An output shaft and a drive shaft 6 of an HC motor 1 (eddy current joint type motor, manufactured by Hitachi, Ltd., trade name) having a driving AC motor and an eddy current joint type clutch.
a is connected by a flex coupling 2, a pulley 4a is attached to a drive shaft 6a,
Pulley 4b fixed to driven shaft 6b by stepped belt 7
To rotate. Here, the radius ratio of the pulley, that is, (the radius of the pulley 4a) / (the radius of the pulley 4b) is 2, and the target rotation speed of the driven shaft 6b is 6089 rpm (2723r
pm × √5) was obtained when the rotation speed of the drive shaft 6a was 3045 rpm.

The driven shaft 6b is supported by bearings 8a, 8b and 8c, and has an inertia disk 9 having a moment of inertia of 1.7 kg (44 kg / 5 ² ) attached thereto. A disk rotor 10 is fixed to the upper end. I have. At the lower end of the holding shaft 16 supported by the bearings 13a and 13b, an air cylinder 1 is provided as a mechanism for lifting the hydraulic cylinder 18.
2 is mounted thereon, and a floating caliper 11 having an area 15.
Disk pad 20a of ^{4cm 2 (77cm 2/5)} , 2
0b is a distance of 4.6 cm (10.2 cm) from the center of the driven shaft 6 b.
cm / √5) and the hydraulic cylinder 1
8, a mechanism for generating frictional force by being pressed against the disk rotor 10.

The size of the testing machine is approximately 1.5 m × 1 m
× 2 m (W × D × H). The installation floor area at this time is
It is a 1.5m × 1m = 1.5 ^2. Because floor space when the transversely becomes 1.5m × 2m = 3m ^2, 1
/ 2 space can be reduced.

[0018]

According to the present invention, the test piece is installed so that the rotation axis is vertical and the disk rotor surface is horizontal, and the test piece disk pad is installed so as to press the upper and lower surfaces of the disk rotor and the upper test piece is provided. The floating brake caliper with the mechanism for lifting the disk pad and the hydraulic cylinder is provided, so that the brake test can be performed in a small space and with high accuracy with little vibration of the rotating shaft. Also, the dragging of the disk pad caused by the vertical placement could be eliminated by the hydraulic cylinder lifting mechanism using the air cylinder.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of FIG. 1;

[Explanation of symbols]

1. Eddy current joint type motor 2. Flex coupling 3a. 3b. Bearing 4a. 4b. Pulley 5. Emergency brake 6a. 6b. Rotation axis 7. Belt 8a. 8b. 8c.
Bearing 9. Inertia disk 10. Disk rotor 11. Caliper 12. Air cylinder 13a. 13b. Bearing 14. Arm 15. Load cell 16. Holding shaft 17. O-ring 18. Hydraulic cylinder 19. Disk pad holding bracket 20a. 20b. Disc pad 21. distance

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiro Hara 1500 Oji Ogawa, Shimodate City, Ibaraki Pref.Hitachi Chemical Industry Co., Ltd. Industrial Co., Ltd.

Claims (2)

(57) [Claims] An area of a disk pad is set to 1 / N of an actual vehicle, an inertia moment is set to 1 / N ² of an inertia moment acting on one wheel of an actual vehicle, and an angular velocity of a disk rotor is set to √N of an actual vehicle.
In testing the brake as a double, a drive motor used for it, a mechanism for transmitting the torque of the clutch and the motor, a rotating shaft with an inertial disk fixed, a disk rotor attached to one end of the rotating shaft, and a disk In an inertial brake tester for a test piece, comprising a test piece disc pad for pressing both sides of a rotor and a brake caliper having a hydraulic cylinder for transmitting pressure to the test piece disc pad, the rotation axis is vertical and the disk rotor surface is horizontal. And a floating brake caliper with a mechanism for lifting the test piece disk pad and hydraulic cylinder above the test piece disk pad, with the test piece disk pad pressed against the upper and lower surfaces of the disk rotor. Characterized by test piece for custom Formula brake testing machine. 2. The inertial brake tester for a test piece according to claim 1, wherein the mechanism for lifting the hydraulic cylinder in the brake caliper to the upper portion uses an air cylinder.