JPH11304609A - Brake test equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure even a very small brake torque while enlarging the measuring range of brake torque. SOLUTION: A guide shaft 23 is inserted into a hollow torque meter shaft 21 supported, on the opposite end sides thereof, by a sleeve bearing 25 and a guide bearing 15a disposed on the flywheel side. At the time of measuring a large brake torque, the guide shaft 21 is moved in the axial direction by means of a hydraulic cylinder 26 and the fitting part thereof is fitted to the fitting part 22a of a coupling 22 thus enhancing rigidity on the torque meter shaft 21 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake test device for testing a brake.

[0002]

2. Description of the Related Art FIG. 4 is a front view of a conventional brake test apparatus, and FIG. 5 is an enlarged longitudinal sectional view of a main part thereof. The rotating shafts 2 and 4 are connected by a coupling 5. The rotating shaft 4 is rotatably supported by bearings 6 and 7. Reference numeral 8 denotes a torque meter, and a torque meter shaft 9 is rotatably supported by bearings 10 and 11,
A torque arm 12 is attached to the torque meter shaft 9, and a load meter 13 is provided between the torque arm 12 and the fixed portion.
Are connected.

A coupling 14 is provided at one end of the rotating shaft 4.
The guide bearing portion 15 is connected to the guide bearing portion 15 via a brake mounting portion 16.
The brake disk 17a of the brake under test 17 is attached to the. On the other hand, one end of the torque meter shaft 9 is connected via a coupling 18 to a guide shaft 19 in which a roller provided on the inner periphery of the guide bearing portion 15 is fitted with a guide bearing 15a formed of a bearing. The brake caliper 17b of the brake under test 17 is mounted via the brake mounting portion 20. In addition, the guide bearing 15 has a guide bearing 15.
A grease nipple 15b for supplying grease is provided on both sides of the guide bearing 15a in the axial direction.
5c is provided.

When the flywheel 3 is rotated by the drive motor 1 in the conventional brake test apparatus having the above structure, the flywheel 3 stores the same energy as when the vehicle is running. When the flywheel 3 is operated and locked with the brake disc 17a, the flywheel 3 is braked, and at the same time, the braking torque at this time is detected by the load meter 13 from the torque meter shaft 9 via the torque arm 12. Also, the guide bearing 15
By fitting the a and the guide shaft 19, the center accuracy of the torque meter 8 and the flywheel 3 is improved, and the eccentric load during braking is also received by both.

[0005]

In the above-described conventional apparatus, the inertial force of the inertial body accelerated to a constant rotation or the driving torque of the driving motor 1 is braked by the brake 17 to be tested. The rolling resistance between the guide bearing 15a and the guide shaft 19 is added to the applied braking torque, and a large error occurs when a small braking torque is measured.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a brake test apparatus capable of improving the measurement accuracy of a small braking torque and expanding the measurement range of the braking torque. With the goal.

[0007]

According to the brake test apparatus of the present invention, a torque meter shaft is hollow, a guide shaft is inserted into the hollow torque meter shaft, and one end of the guide shaft is connected to a moving mechanism. The guide shaft is connected so as to be able to move in the direction, and is supported by a sleeve bearing and a guide bearing provided on the rotary drive side so as not to contact the torque meter shaft, and is moved in the axial direction at the time of a large braking torque. And the inner circumference of the torque meter shaft side.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are longitudinal sectional views of a main part of the brake test apparatus according to this embodiment when measuring a large braking torque meter and when measuring a small braking torque, and FIG. 3 is an enlarged view of a portion A in FIG. In the figure, reference numeral 21 denotes a hollow torque meter shaft, which is rotatably supported by bearings 10 and 11 as in the prior art, and is connected to a load meter 13 via a torque arm 12. However, the bearings 10 and 11 are hydrostatic bearings having small rolling resistance. Reference numeral 22 denotes a coupling for connecting the coupling 18 and the brake mounting portion 20, all of which have a hollow shape. Reference numeral 23 denotes a guide shaft inserted through the torque meter shaft 21, one end of which is supported by a sleeve bearing 25 made of OILES metal supported by a bearing base 24, and the other end of which is supported by a guide bearing 15a. The guide shaft 23 is the torque meter shaft 2
No contact with 1. However, as shown in FIG.
A gap L is provided between a and the guide shaft 23 so that the guide shaft 23 can be easily moved in the axial direction.

Reference numeral 26 denotes a hydraulic cylinder of the hydraulic mechanism, which has a hydraulic oil inlet 26a and a hydraulic oil outlet 26b. 27
Is a piston, and one end of the guide shaft 23 is rotatably connected via a connecting portion 28 and a thrust bearing 29. 22
a and 23a are mutual fitting portions provided on the coupling 22 and the guide shaft 23.

Next, the operation of the above configuration will be described. After the flywheel 3 is driven to a constant rotation by the drive motor 1 and the brake caliper 17b is locked to the brake disk 17a, the brake mounting portion 20 and the coupling 22,
A braking torque is applied to the torque meter shaft 21 via the torque arm 18 and the braking torque is measured by the load meter 13 via the torque arm 12. When the braking torque is small, FIG.
As shown in FIG. 7, the guide shaft 23 is moved rightward by the hydraulic cylinder 26, and the fitting portions 22a and 23a are separated. Therefore, the rolling resistance applied to the torque meter shaft 21 is only for the bearings 10 and 11, and the measurement of the minute braking torque becomes possible. At the time of the large braking torque, the guide shaft 23 is moved leftward by the hydraulic cylinder 26 and the fitting portions 22a, 23a are fitted together as shown in FIG. Accordingly, the unbalanced load generated at the time of the large braking torque is received by the guide shaft 23, and the guide shaft 23 is supported by the sleeve bearing 25 and the guide bearing 15a. Measurement becomes possible. At the time of a large braking torque, a large bending occurs on the rotary drive side or the torque meter shaft 21 side. Therefore, even if there is a gap L, the guide bearing 15a and the guide shaft 23 are surely in contact with each other.

[0011]

As described above, according to the present invention, since the torque meter shaft is hollow and the guide shaft is inserted through the torque meter shaft, the rolling resistance between the guide shaft and the guide bearing is reduced by the torque meter shaft. Without adding, it becomes possible to measure the minute braking torque. In addition, at the time of measuring the large braking torque, the guide shaft is moved in the axial direction by the moving mechanism to make contact with the torque meter shaft, so that the rigidity of the torque meter shaft is increased, and the measurement range of the braking torque can be expanded.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a main part of a brake test apparatus according to the present invention when measuring a large braking torque.

FIG. 2 is a longitudinal sectional front view of a main part of the brake test apparatus according to the present invention when measuring a small braking torque.

FIG. 3 is an enlarged view of a portion A in FIG. 1;

FIG. 4 is a front view of a conventional device.

FIG. 5 is an enlarged longitudinal sectional front view of a main part of a conventional apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drive motor 3 ... Flywheel 2, 4 ... Rotating shaft 8 ... Torque meter 10, 11 ... Bearing 12 ... Torque arm 13 ... Load meter 14, 18, 22 ... Coupling 15a ... Guide bearing 16, 20 ... Brake mounting part 17 Brake under test 21 Torque meter shaft 22a, 23a Fitting part 23 Guide shaft 25 Sleeve bearing 26 Hydraulic cylinder 27 Piston

Claims (1)

[Claims] 1. A brake test apparatus comprising: a brake under test provided between a rotary drive side and a torque meter shaft; and a braking torque when the rotary drive side is braked by the brake under test is measured by a torque meter. While making the torque meter shaft hollow, a guide shaft is inserted through the hollow torque meter shaft, one end of the guide shaft is connected to the moving mechanism so as to be movable in the axial direction, and the guide shaft is connected to the sleeve bearing and the rotational drive side. The bearing is provided so that it does not come into contact with the torque meter shaft by the guide bearing provided at the same time, and the guide shaft moved in the axial direction at the time of a large braking torque is brought into contact with the inner periphery of the torque meter shaft side. And brake test equipment.