JP3164694B2 - Balance testing machine - Google Patents

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 a device under test having a bent portion in the middle, such as a propeller shaft for an automobile, and more particularly, to a device under the same conditions as when the device under test is mounted. The present invention relates to a balance tester capable of measuring balance.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional propeller shaft balance tester for a vehicle is rotatably mounted on a base 14 of the tester and has one spindle 1 to which a rotary drive mechanism 3 is connected. And the other spindle 2 attached to the base 14 of the testing machine so as to be freely rotatable,
Universal joints attached to both ends of the propeller shaft 10 as test specimens on both spindles
The propeller shaft is rotated by a rotation drive mechanism 3 connected to one of the spindles 1 to support the propeller shafts 11 and 12, and the unbalance of the propeller shaft is measured. 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, universal joints 11 and 12 are attached to both ends of a vehicle propeller shaft 10 as shown in FIG. The spline portion 13 is formed, and the entire length is configured to be extendable. By the way, since the spline portion 13 has a gap (play), the propeller shaft 10 is slightly bent at the spline portion as shown in FIG. 4 due to the influence of gravity or the like.

The direction of the bending is not a fixed direction, and the unbalance of the propeller shaft changes due to the bending. On the other hand, the conventional balancing tester does not have a function of correcting this bending. Therefore, the conventional balance testing machine has a problem that accurate unbalance measurement cannot be performed on the propeller shaft.

The present invention is intended to solve such a problem. In the above-described conventional balancing test machine, a power absorbing mechanism is connected to a spindle which can freely rotate. By applying a torque to the test object during the measurement rotation, the bending of the test object is corrected, and the unbalance measurement under the same conditions as mounted (on a car) can be performed. It is intended to provide a testing machine.

[0006]

In order to achieve the above-mentioned object, a balancing tester according to the present invention has a structure in which a test object is opposed to a base of the balancing tester and is rotatably mounted. includes a spindle group, one of the spindle rotation drive mechanism of the spindle in the same 2 groups are connected, the power absorbing mechanism is connected to the other of the spindle, the rotary drive
Drive mechanism, power absorption mechanism or the other spindle
Or all of them have a torque detector
It is characterized by having.

[0007] Further, in the balance testing machine according to the first aspect,
Further , an automatic control circuit is provided which performs an input of an output signal from the torque detector to control the power absorption amount of the power absorption mechanism to be constant.

[0008]

In the above-described balance testing machine of the present invention, if the test subject torque is applied during measurement on the balance test machine, the test subject no longer bends (at the spline portion).
The test object is in a straight state, and measurement errors due to bending can be eliminated. In addition, the torque acting on the DUT during measurement rotation can be read by the torque detector, and the power absorption amount in the power absorption mechanism is kept constant by the automatic control circuit that receives the output signal from the torque detector as input. Can be

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a balance testing machine according to an embodiment of the present invention; FIG. In FIG. 1, the same reference numerals as those in FIGS.

The balance tester of this embodiment is also provided with a spindle 1 rotatably mounted on a base 14 of the tester and connected to a rotary drive mechanism, and disposed opposite to the spindle 1 and mounted on the base of the tester. 14 is provided with a spindle 2 rotatably mounted, and by both spindles 1 and 2,
The universal joints 11 and 12 at both ends of a propeller shaft 10 as a test object are configured to be supported, and a power absorbing mechanism 4 is connected to the spindle 2. The power absorbing mechanism 4 includes a rotation transmission device 4b and a generator 4a connected to the rotation transmission device 4b. The rotation transmission device 4b is connected to the spindle 2. Reference numeral 4c indicates a variable resistor for adjusting the load (power absorption) provided in the output circuit of the generator 4a.

In the above configuration, the unbalance test of the propeller shaft 10 is performed by rotating the spindle 1 by the rotation drive mechanism 3. During the measurement rotation of the propeller shaft, the generator 4a is driven via the spindle 2 to generate electric power. Therefore, by extracting power from the generator 4a, torque can be applied to the propeller shaft 10 during measurement rotation. In this way, when torque is applied to the propeller shaft 10 during the measurement rotation, the bend in the spline portion 13 formed on the propeller shaft disappears, and the propeller shaft 10
Is in a straight state, and the measurement error due to bending is eliminated. Also, when actually installed in a car,
Since the torque is applied to the propeller shaft, the above-described balancing test can be performed under the same conditions as the mounted state.

That is, since the generator 4a is used for the power absorbing 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 is increased. Can be easily adjusted and controlled. Therefore, by setting this torque to the torque at the time of mounting (details will be described later), a balancing test can be performed under the same conditions as the mounting state. Note that a mechanical brake device may be used instead of the generator 4a of the power absorbing mechanism 4.

Further, by attaching a torque detector 15 to any one or all of the spindle 2, the rotary drive mechanism 3 and the power absorbing mechanism 4, the torque applied to the propeller shaft during measurement rotation can be reduced. The amount can be detected. The torque detector may be attached to the spindle 1. By adjusting the variable resistor 4c based on the torque value detected by the torque detector, the propeller shaft 10 during rotation measurement is adjusted.
Is adjusted to a predetermined value (torque value at the time of mounting), and the unbalance measurement can be performed under the same conditions as when the propeller shaft 10 is mounted. Further, when an output signal from the torque detector is input and an automatic control circuit 16 is operated to operate so that the power absorption amount in the power absorption mechanism 4 is constant, more accurate unbalance measurement can be performed. .

[0014]

As described above, according to the balance tester of the present invention, the following effects and advantages can be obtained. (1) Since a torque can be applied to the DUT during the measurement rotation, the DUT can be measured unbalanced in a straight state even if the DUT has a bent portion. (2) The torque applied to the DUT during the measurement is detected by the torque detector, and the torque applied to the DUT is adjusted to a predetermined value (optimum value). A measurement can be made. (3) By using an automatic control circuit that receives the output from the torque detector as input, the torque applied to the DUT during measurement is controlled so as to be constant or equal to the mounted state, and a more accurate unbalance measurement is performed. Can do it.

[Brief description of the 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 balancing tester.

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

FIG. 4 is an exaggerated side view showing the bent state.

[Explanation of symbols]

 1, 2 spindle 3 rotation drive mechanism 3a motor 3b gear unit 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 (2)

(57) [Claims] 1. A balancing tester comprising two spindles which are arranged opposite to each other and are rotatably mounted to mount a test object on a base of the balancing tester. A rotation drive mechanism is connected to one of the spindles, a power absorption mechanism is connected to the other spindle, and the rotation drive mechanism, the power absorption mechanism or
To one or all of the other spindles
A balancing tester comprising a torque detector . 2. The balancing tester according to claim 1, wherein
An equilibrium test machine, comprising: an automatic control circuit that receives an output signal from the torque detector as input and performs control for making the power absorption amount of the power absorption mechanism constant.