JPH06323943A - Balance tester - Google Patents

Abstract

PURPOSE:To provide a balance tester made capable of measuring unbalance of a propeller shaft for a car under the same condition as actually loaded on a car. CONSTITUTION:To one spindle 1 out of two spindles 1, 2 arranged face to face to place a propeller shaft, a rotary drive mechanism 3 is connected, and to the other spindle 2, a power absorption mechanism 4 is connected in the constitution. By adding torque with the power absorption mechanism 4 to the propeller shaft 10 rotating for measurement, a bend at a spline part 13 of the propeller shaft 10 is corrected, and by controlling the torque added by the power absorption mechanism 4, the unbalance measurement at the same state as loaded on a car is enabled. Besides, an electric generator 4a constituting the power absorption mechanism 4 and a variable resistor 4c provided in a power circuit of the generator 4a for controlling the power absorption (torque) are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balance tester for an object to be tested having a bent portion in the middle such as a propeller shaft for automobiles, and more particularly to a balance tester under the same conditions as those for mounting the object to be tested. The present invention relates to a balance tester capable of measuring the balance.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional propeller shaft balance tester for an automobile has one spindle 1 rotatably mounted on a base 14 of the tester and to which a rotary drive mechanism 3 is connected. , Equipped with the other spindle 2 mounted on the base 14 of the tester so as to be freely rotatable,
Universal joints attached to both ends of the propeller shaft 10 as the DUT.
11 and 12 are supported, and the propeller shaft is rotated by the rotary drive mechanism 3 connected to one spindle 1 to measure the imbalance of the propeller shaft. Reference numerals 3a and 3b in the figure indicate a motor and a rotation transmission device that constitute the rotation drive mechanism 3.

[0003]

Generally, as shown in FIG. 3, a propeller shaft 10 for an automobile has universal joints 11 and 12 attached to both ends thereof, and one universal joint 12 has an attached portion. The spline portion 13 is formed so that the entire length can be expanded and contracted. By the way, since the spline portion 13 has a gap (backlash), the propeller shaft 10 is slightly bent at the spline portion due to the influence of gravity or the like, as shown in FIG.

The direction of this bending is not a fixed direction, and the unbalance of the propeller shaft changes due to the bending. On the other hand, the conventional balance tester does not have the function of correcting this bending. Therefore, there is a problem in that the conventional balance tester cannot accurately measure the imbalance of the propeller shaft.

The present invention is intended to solve such a problem, and in the conventional balance testing machine as described above, a power absorbing mechanism is connected to a freely rotatable spindle. By adding torque to the DUT during measurement rotation, the bending of the DUT is corrected and the unbalanced measurement can be performed under the same conditions as when mounted (in a car). The purpose is to provide a testing machine.

[0006]

In order to achieve the above-mentioned object, a balance testing machine of the present invention is arranged so as to be opposed to a base of the balance testing machine for mounting an object to be tested and is rotatable. It is equipped with two attached spindles.
The rotary drive mechanism is connected to one of the base spindles, and the power absorption mechanism is connected to the other spindle.

Further, in the equilibrium tester according to claim 1, a torque detector is provided on any one of the rotary drive mechanism, the power absorbing mechanism or the other spindle, or all of them. There is. Further, in the balance testing machine according to claim 2, an automatic control circuit is provided which receives an output signal from the torque detector as an input and performs control for making the amount of power absorbed by the power absorbing mechanism constant. I am trying.

[0008]

In the above-described balance tester of the present invention, when torque is applied to the DUT during measurement on the balance tester, the bending of the DUT (at the spline portion) disappears,
The device under test is in a straight state, and the measurement error due to bending can be eliminated. In addition, the torque detector can read the torque that acts on the DUT during measurement rotation, and the automatic control circuit that receives the output signal from the torque detector as an input keeps the amount of power absorbed in the power absorption mechanism constant. Can be

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A balance testing machine as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a general schematic view of the testing machine. The same reference numerals as those in FIGS. 2 to 4 in FIG. 1 indicate almost the same members.

The balance tester of this embodiment is also equipped with a spindle 1 rotatably mounted on a base 14 of the tester and having a rotary drive mechanism connected thereto, and a base of the tester which is arranged opposite to the spindle 1. It is equipped with a spindle 2 rotatably attached to 14, and by both spindles 1 and 2,
A propeller shaft 10 as a device under test is configured to support universal joints 11 and 12 at both ends thereof, and a power absorption mechanism 4 is connected to the spindle 2. The power absorption mechanism 4 includes a rotation transmission device 4b and a generator 4a connected to the rotation transmission device 4b, and the rotation transmission device 4b is connected to the spindle 2. Reference numeral 4c indicates a variable resistor for adjusting the load (power absorption amount) provided in the output circuit of the generator 4a.

In the above structure, the unbalanced test of the propeller shaft 10 is performed by rotating the spindle 1 by the rotary drive mechanism 3. Then, during the measurement rotation of the propeller shaft, the generator 4a is driven via the spindle 2 to generate electric power. Therefore, by extracting the electric power from the generator 4a, it is possible to apply torque to the propeller shaft 10 during the measurement rotation. In this way, when torque is applied to the propeller shaft 10 during the measurement rotation, the bending at the spline portion 13 formed on the propeller shaft is eliminated, and the propeller shaft 10
Is straight, and the measurement error caused by bending is eliminated. Also, in the state where it is actually incorporated in the car,
Since torque is applied to the propeller shaft, the above balance test can be performed under the same conditions as in the mounted state.

That is, since the generator 4a is used for the power absorption mechanism 4 and the amount of power absorption can be adjusted by operating the variable resistor 4c, the torque applied to the propeller shaft during the measurement rotation. Can be easily adjusted and controlled. Therefore, by setting this torque to the torque at the time of mounting (details will be described later), it becomes possible to perform a balance test under the same conditions as the mounting state. A mechanical brake device may be used instead of the generator 4a of the power absorption mechanism 4.

Further, a torque detector 15 is attached to any one or all of the spindle 2, the rotation drive mechanism 3 and the power absorption mechanism 4, so that the torque applied to the propeller shaft during the measurement rotation can be reduced. The amount can be detected. The torque detector may be attached to the spindle 1. Then, by adjusting the variable resistor 4c based on the torque value detected by the above torque detector, the propeller shaft 10 during rotation measurement is adjusted.
It is possible to adjust the torque to be added to a predetermined value (torque value during mounting) and perform unbalance measurement under the same conditions as when mounting the propeller shaft 10. Further, when an automatic control circuit 16 which receives an output signal from the torque detector as an input and operates so that the amount of power absorption in the power absorption mechanism 4 becomes constant, a more accurate imbalance measurement can be performed. .

[0014]

As described in detail above, according to the balance testing machine of the present invention, the following effects and advantages are obtained. (1) Since torque can be applied to the DUT during the measurement rotation, even if the DUT has a bent portion, the unbalanced measurement can be performed on the DUT in a straight state. (2) Unbalance under the same conditions as mounting by adjusting the torque applied to the DUT to a predetermined value (optimum value) by detecting the torque applied to the DUT during measurement with the torque detector. The measurement can be performed. (3) The automatic control circuit, which receives the output from the torque detector as input, controls the torque applied to the DUT during measurement to a constant value or to a value equivalent to the mounted state, for more accurate imbalance measurement. Can be done.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram schematically showing a balance testing machine as one embodiment of the present invention.

FIG. 2 is an overall configuration diagram schematically showing a conventional balance testing machine.

FIG. 3 is a side view of a general propeller shaft.

FIG. 4 is a side view showing an exaggeratedly bent state.

[Explanation of symbols]

 1, 2 spindle 3 rotation drive mechanism 3a motor 3b gear device 4 power absorption mechanism 4a generator 4b rotation transmission device 4c variable resistor 10 propeller shaft 11, 12 universal joint 13 spline section 14 base 15 torque detector 16 automatic control circuit

Claims (3)

[Claims] 1. A balance testing machine comprising two spindles, which are rotatably mounted on the base of the balance testing machine so as to be opposed to each other so as to mount an object to be tested, and the two spindles. A balance testing machine, wherein a rotary drive mechanism is connected to one of the spindles and a power absorbing mechanism is connected to the other spindle. 2. The balance testing machine according to claim 1, wherein a torque detector is provided on any one or all of the rotary drive mechanism, the power absorption mechanism, and the other spindle. A balance tester. 3. The balance testing machine according to claim 2, further comprising an automatic control circuit that receives an output signal from the torque detector and controls the amount of power absorbed by the power absorbing mechanism to be constant. A balance testing machine, which is characterized in that