JPS61167822A - Dynamo motor for measuring brake noise - Google Patents

Abstract

PURPOSE:To measure the level, frequency, etc., of a noise generated by a brake in operation through a stationary test by using a roller which has small moment of inertia and a roller which has large moment of inertia and is attachable to and detachable from a shaft. CONSTITUTION:When the brake noise of a light automobile is measured, a clutch 9 is coupled, a speed reducing mechanism 10 is detached from the shaft 2, and an iron-made roller 3a is detached to establish a state wherein the moment of inertia is small, thereby taking a measurement by using only an aluminum-made roller 3b. When the noise test of a large truck is taken, the roller 3a is attached to the shaft 2 together with the roller 3b and the clutch 10 is disengaged to drive the rollers 3a and 3b at a low speed by using the speed reducing mechanism 10. In such a state, when a wheel which is rotated while placed on the roller 3a is braked, the inertial force of rotation from a motor 1 is applied to the roller 3a through the speed reducing mechanism 10, so braking wherein the brake is dragged because of large straight-movement inertia of the body of the large-sized truck, i.e. dragging type braking is obtained.

Description

[Detailed Description of the Invention] A. Purpose of the Invention (Field of Industrial Application) This invention is for measuring the noise generated from the brakes during braking of an automobile, that is, the magnitude, frequency, etc. of brake noise, by a field test. This invention can be applied to the dynamometer used.

(Prior Art) In order to measure the brake noise of an automobile by a stationary test, it is necessary to have a device that brakes wheels equipped with brakes in the same state as possible when the vehicle is running.

For this purpose, a dynamometer as shown in FIG. 2 has been used conventionally. This device consists of a roller 3 rotated by a motor 1 through a shaft 2, with the upper part exposed from the floor 4, and the shaft 2 is provided with an appropriate moment of inertia to increase the moment of inertia of the dynamometer. It has a heavy object 5 attached to it. The diameter of the roller 5 is made large in order to approximate the shape of the road surface.

When in use, the wheels 6 of a car that have been moved onto the floor 4
is placed on the roller 3, and the motor 1 rotates the roller 3 and the heavy object 5. This causes the wheels 6 to rotate in the same way as when a car is running. If the brakes are applied while the wheels 31, 5, etc. are idling (tests may be conducted at various constant speeds), the rollers 31, heavy objects 5, wheels 6, etc. will be damaged due to friction with the tires. The rotation of the shaft 2 is gradually decelerated and stopped. If brake noise occurs during this time, it is captured by microphone 7,
It is placed in a measuring device 8 to measure and record its volume, frequency, etc.

(Problems to be Solved by the Invention) Since such a dynamometer is commonly used in everything from small light cars to large trucks, it has the following disadvantages.

That is, the rotational inertia of the motor 1, shaft 2, roller 3, heavy object 5, etc. should correspond to the straight-line inertia due to the weight of the vehicle to be tested, so it can be used in common from small light vehicles to large trucks. It is difficult to design these. Since it is difficult to replace the heavy object 5 installed in the middle of the shaft 2, the roller 3 installed at the end of the shaft is made of light aluminum (the diameter cannot be made smaller as it is exposed from the floor 4) and iron. Even if it was replaced with a larger one, it could not be made suitable for both large and small cars.

Structure of the Invention (Means for Solving the Problems) This invention will be explained using FIG. 1 showing an embodiment. The roller 3 includes a roller 3a with a large rotational moment and a roller 3b with a small rotational moment. It is divided into
The roller 3a having a large rotational moment can be attached to and detached from the shaft 2. Further, a clutch 9 and a speed reduction mechanism 10 sandwiching the clutch 9 are provided between the motor 1 and the heavy object 5, and the speed reduction mechanism 10 can be attached to and removed from the shaft 2.

(Function) When measuring noise on light vehicles, clutch 9
, remove the reduction mechanism 10 from the shaft 2, and remove the iron roller 3.
A is removed, the moment of inertia is small, and the measurement is performed using only the aluminum roller 3b.

At this time, the rotational inertia of the rollers 3b, the heavy object 5, the motor 1, the shaft 2, etc. is comparable to the straight-line inertia of a light vehicle, so when the wheels are braked, a force due to the straight-line inertia of the vehicle body is applied to the brakes. Braking is performed in a state comparable to that of a light vehicle, making it possible to test an inertial method similar to the braking of an actual light vehicle.

When conducting a noise test on a large truck, the iron roller 3a and the aluminum roller 3b are attached to the shaft 2, the clutch 9 is removed, and the speed reduction mechanism 10 is used to drive the rollers 3a and 3b at a reduced speed. When a wheel rotating on the iron roller 3a is braked in this state, the rotational inertia of the motor 1 is applied to the roller 3a via the deceleration mechanism 10, so there is a large resistance to the braking force that attempts to decelerate the roller 3a. Due to the large straight-line inertia of the large truck body, the brakes are dragged and AtIrJ
Well, Shiro's braking is performed in the following manner: 1, 1, 11, 4, J, and 4.

(Embodiment) The embodiment shown in FIG. The small gear 13 and large gear 14 that mesh with the two gears are connected to the subshaft 15.
As well as connecting with.

This allows each gear to be disengaged. For this purpose, the sub-shaft 15 can be moved parallel to the axis 2. The position of the subshaft 15 may be fixed and a clutch may be provided within the subshaft instead.

By doing this, the roller 3 with a large moment of inertia
Remove a, connect clutch 9, and connect gears 11 and 13.12.
If the rollers 3b and 14 are disengaged and the motor 1 rotates the roller 3b, an inertial braking test on a light vehicle can be performed with small rotational inertia, as described above. When the roller 3a with a large moment of inertia is installed, the clutch 9 is removed, the gears 11, 13, 12, and 14 are engaged, and the motor l is rotated, a drag-type brake test on a large truck is performed as described above. Can be done. At this time, the heavy roller 3a is
Since the motor is driven via the motor l, the load on the motor l is lighter than in the case of direct drive.

C. Effects of the invention (1) When measuring the brake noise of a light vehicle, only the roller 3b with a small moment of inertia is used, and an inertia method test is performed using a rotating roller with a small moment of inertia comparable to the straight-line inertia of a lightweight light vehicle. can be done.

(2) When measuring the brake noise of a large truck, it is possible to perform a drag-type test using a rotating roller with a large moment of inertia comparable to the straight-line inertia of a heavy truck by using the roller 3a with a large moment of inertia.

(3) When using the roller 3a with a large moment of inertia, it is driven via the deceleration mechanism 10, so the load on the motor 1 is reduced.

(4) It is possible to easily attach and detach the heavy roller 3b, which has a large moment of inertia, by preparing an attaching and detaching device, but due to the nature of the test, sufficient time can be spent on maintenance, so the test There is no obstacle to doing so.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of a dynamometer for measuring brake noise according to the present invention, and FIG. 2 is a schematic diagram showing the configuration of a conventional dynamometer. l: motor, 2: shaft, 3.3a, 3b: roller, 4: floor, 5: heavy object, 6: wheel, 7: microphone, 8: measuring instrument, 9: clutch, 10: deceleration mechanism, 11: small gear, 1
2.13: Large gear, 14: Small gear, 15: Subshaft.

Claims (1)

[Claims] In order to increase the moment of inertia, a motor (1) rotates a roller (3) via a shaft (2) to which a heavy object (5) is attached, and a wheel (6) is placed on the roller (3) to rotate it. In the dynamometer for measuring brake noise, the roller (3) is replaced with a roller (3) with a small moment of inertia.
b) and a roller (3a) with a large moment of inertia that can be attached to and detached from the shaft (2).
), and a deceleration mechanism (10) that decelerates and drives the shaft (2) divided into two by the clutch (9).
A dynamometer for measuring brake noise, characterized in that a clutch (9) is disposed between the two.