JP2511342Y2 - Calibration device for power test equipment - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a calibration device for a power test device.

B. Outline of the Invention The present invention relates to a calibration device for performing calibration, such as an electric dynamometer and a torque meter, in which a calibration balance is connected in parallel to a calibration arm attached to an oscillator through a coupling fitting, while
By using a pair of upper and lower balance fulcrums, it is possible to easily perform calibration on both left and right rotation sides with a lightweight calibration weight.

C. Conventional Technology An electric dynamometer is generally used for the power test equipment. FIG. 4 shows an engine dynamometer as an example of a power test device. In the illustrated example, in the electric dynamometer 1, a oscillating member 4 is swingably supported by a levitation bearing 3 on a bed 2, while the oscillating member 4 has a rotor shaft (hereinafter referred to as a rotating shaft).
5 is rotatably supported. Rocker 4
A torque arm 6 is horizontally attached to the rear end, and a load cell 7 as a load measuring device is interposed between the tip of the torque arm 6 and the bed 2.

The rotating shaft 5 is connected to one end of a shaft torque detecting shaft (element shaft) 10 of a torque meter 9 via a coupling 8, and the other end of the element shaft 10 is connected to an output shaft of an engine 12 via a coupling 11. It is linked to 13. In the figure, 14 is a disc brake that fixes the end of the element shaft 10 on the engine side.

In this engine dynamometer, the engine 12 is operated, the output is measured by the electric dynamometer 1, and the shaft torque is measured by the torque meter 9.

By the way, the load cell 7 of the electric dynamometer 1 converts a compressive load or a tensile load, and the strain gauge of the torque meter 9 converts a torsion torque into an electric signal to measure a rotational torque in both left and right directions. As they overlap, measurement errors gradually occur. Therefore, in order to accurately perform the power performance test, it is necessary to appropriately perform an error check, that is, a calibration.

As shown in a perspective view in FIG. 5, when the calibration of the electric dynamometer 1 is performed, the calibration arms 15 and 16 are attached to the left and right of the outer circumference of the oscillator 4, and the calibration weights are attached to the ends of the calibration arms 15 and 16. The method of hanging 17 was adopted. In the example shown, the left calibration arm
A calibration weight 17 is attached to 15 and a counterclockwise rotational force is generated in the oscillator 4. As a result, the simulated load P in the compression direction acts on the load cell 7, and the display section 18 of the control panel 18
The measured value is displayed in a.

Calibration is performed by comparing this measured value with the rotational torque (preliminarily calculated) corresponding to the simulated load P. Further, calibration on the pulling side of the load cell 7 is performed by suspending a calibration weight on the calibration arm 16 on the right side and causing the oscillator 4 to generate a clockwise rotational force.

On the other hand, the calibration of the torque meter 9 is performed with the electric dynamometer 1 separated as shown in FIG. First, the end of the element shaft 10 on the engine 12 side is fixed by the disc brake 14, and the calibration arm 19 is attached to the coupling 8 of the element shaft 10 on the electric dynamometer 1 side. Then, the calibration weight 17 is hung on the end of the calibration arm 19 to generate a torsion torque on the element shaft 10, and the measured value and the rotation torque are compared with each other as in the case of the electric dynamometer 1.

D. Problems to be Solved by the Invention The conventional engine dynamometer described above has the following problems when performing calibration. The electric dynamometer 1 and the torque meter 9 are calibrated before the performance test of the engine is carried out, but the calibrated range is the power measurement range in the performance test.
Therefore, when measuring a large amount of power, it is necessary to apply a large load to the load cell 7 etc. to perform calibration.
A heavy one is also used for 17. For example, in FIG. 5, the distance between the center of the oscillator 4 and the load cell 7 (in the figure,
L ₁ ) and the distance between the center and the calibration arms 15 and 16 (in the figure,
Since the ratio of L ₂ ) is 1: 2, 150 kg of calibration weight 17 is required to apply the simulated load P of 300 kg to the load cell 7.

Therefore, it requires a great deal of labor and time to attach the calibrating weight 17, and there is a risk of dropping or the like. Also,
In order to calibrate both the compression and tension directions of the load cell 7, it is necessary to individually attach the calibration weights 17 to the left and right calibration arms 15 and 16, and a large number of man-hours are required for setup and movement of the calibration weights 17, and A large work space must be provided on both sides of the oscillating piece 4, which is a problem in terms of equipment.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a calibration device that can perform work safely, easily, and in a short time.

E. Means for Solving the Problem Therefore, in order to solve this problem, the present invention uses a calibrating device for a power testing device, which is used for calibrating a power testing device such as an electric dynamometer or a torque meter, in order to solve the problem. One end of which is fixed to the oscillator or the element shaft of the device, and the other end of which is connected to a calibration arm in parallel with the calibration arm through which a metal fitting connection portion is formed.
A weighing balance that urges the weighing arm upward or downward, a pair of upper and lower balance fulcrums that are installed on the fixed part of the power test device and correspond to the left rotation side calibration and the right rotation side calibration, and the weighing balance. Is formed at one end of the balance balance and is formed at the other end of the weighing balance and a pair of arm-side connecting portions that are connected to the balance fulcrum base or the connecting fitting during the left rotation side calibration or the right rotation side calibration. , A pair of calibration weight mounting parts to which a calibration weight is attached to either the left rotation side calibration or the right rotation side calibration.

F. Action In the calibration device for the power test device configured as described above, the calibration balance is set on either one of the upper and lower balance fulcrums, and then the calibration weight is attached to the calibration weight attachment portion of the calibration balance. Then, the simulated load is transmitted to the calibration arm via the connecting fitting, and the left rotation side or the right rotation side can be easily calibrated. Further, by appropriately setting the distance between the balance fulcrum base and the connecting metal fitting and the distance between the balance fulcrum base and the calibration weight mounting portion, a boosting action occurs, and a large weight can be calibrated by the lightweight calibration weight.

G. Embodiment An embodiment of the present invention will be specifically described with reference to the drawings.
In the description of the embodiments, the same members as those in the above-described conventional example are designated by the same reference numerals, and duplicated description will be omitted.

FIG. 1 is a perspective view showing an embodiment of a calibration device for a power test apparatus according to the present invention, and FIGS. 2 and 3 show the operation of this embodiment.

In FIG. 1, 20 is a calibration arm, one end of which is bolted to the center of the mirror surface of the oscillator 4 and the other end is provided with knife edges on both upper and lower surfaces to which a connecting metal fitting 21 is connected. A metal fitting connection portion 20a is provided. The oscillator 4
The ratio of the distance between the center and the load cell 7 (L _{1 in the} figure) to the distance between the center and the connecting fitting 21 (L _{3 in the} figure) is 1: 1. In the state shown in the figure, the calibration arm 20 is connected to the calibration balance 22 located below via a connecting fitting 21.

A pair of arm-side connecting portions 22a and 22b having knife edges formed on the upper surface and the lower surface are provided at the ends of the weighing balance 22 on the weighing arm 20 side. The connecting fitting 21 is connected to the right arm-side connecting portion 22b, and the left arm-side connecting portion 22a is supported by the lower balance fulcrum base 23 attached to the upper surface of the bed 2. On the other hand, at the other end of the weighing balance 22, there are formed a pair of calibration weight mounting portions 22c and 22d each having a knife edge formed on the upper surface thereof. In the state of FIG. A calibration weight 17 is suspended. Further, on the upper surface of the bed 2, an upper balance fulcrum base 24 is attached on the opposite side of the lower balance fulcrum base 23 across the metal fitting connecting portion 20a of the calibration arm 20.

The operation of the embodiment will be described below with reference to FIGS. 2 and 3.

FIG. 2 shows the case of calibration on the right rotation side, and the arrangement of the calibration balance 22, the calibration weight 17, etc. is the same as in FIG. In this state, the weighing balance 17 swings around the lower balance fulcrum base 23 by the weighing weight 17, and the weighing arm 20, that is, the oscillating member 4 is biased clockwise through the connecting fitting 21. Fold weight lower balance fulcrum base 23 of the calibration weight 17, (in the figure, 1 ₁₎ the distance between the connecting fitting 21 (in the figure, 1 ₂₎ and the lower balance fulcrum base 23, the distance between the calibration weight 17 by the ratio of the The force is transmitted to the calibration arm 20.

In the present embodiment, this ratio is 1:10, and as described above, the ratio of the distance between the center of the oscillator 4 and the load cell 7 and the distance between the center and the connecting fitting 21 is 1: 1. When the load cell 7 is calibrated with the simulated load P of 300 kg, the calibration weight 17 of 30 kg should be used.

FIG. 3 shows the case of the left rotation side calibration. First,
The operator moves the weighing balance 22 above the weighing arm 20,
The right arm side connecting portion 22b is supported by the upper balance fulcrum base 24. Then, the left arm side connection portion 22a and the calibration arm 2
While connecting the metal fitting connecting portion 20a of 0 with the connecting metal fitting 21, the calibration weight 17 is hung on the calibration weight mounting portion 22d on the right side. This work can be performed by only slightly moving the calibration balance 22, the calibration weight 17 and the like from the state of calibration on the right rotation side, and thus the labor and man-hours required are far less than those of the conventional ones.

In this state, the weighing balance 22 swings around the upper balance fulcrum stand 24, and the weighing arm 20, that is, the oscillating member 4 is biased counterclockwise via the connecting fitting 21. In the case of the left rotation side calibration as well, as in the case of the right rotation side calibration, the weight of the calibration weight 17 is boosted at a ratio of 1:10 (1 ₁ : 1 _{2 in the} figure) and transmitted to the calibration arm 20. .

In the present embodiment, in addition to the metal fitting connection portion 20a on the side of the weighing arm 20, the arm side connection portions 22a and 22b and the weight attachment portions 22c and 22d on the side of the weighing balance 22 are all knife edges. The settings in are extremely easy and accurate.

Although the description of the specific embodiment has been completed, the embodiment of the present invention is not limited to this embodiment. For example, the present invention may be applied to calibration of a torque meter, or may be applied to a power test device other than an engine dynamometer, such as a chassis dynamometer or a brake dynamometer. Further, in the above-mentioned embodiment, the knife edge is used for connecting the calibration arm, the weighing balance and the like, but the connection may be made by a cylindrical pin or the like.

H. Effect of the Invention According to the calibration device for a power test device according to the present invention, in addition to a cantilevered calibration arm, a calibration balance, a pair of upper and lower balance fulcrums, etc. are used to calibrate the electric dynamometer and torque meter. Therefore, there is an effect that the calibration on both the left and right rotation sides can be easily performed with a lightweight calibration weight.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a calibration device for a power test device according to the present invention, and FIGS. 2 and 3 are explanatory views showing the operation of this embodiment. Further, FIG. 4 is a front view showing a conventional power test device, FIG. 5 is a perspective view showing a conventional calibration method of an electric dynamometer, and FIG. 6 is a conventional calibration method of a torque meter. It is a perspective view. In the figure, 1 is an electric dynamometer, 4 is an oscillator, 7 is a load cell,
Reference numeral 17 is a calibration weight, 20 is a calibration arm, 21 is a connecting metal fitting, 22 is a calibration balance, 23 is a lower balance fulcrum stand, and 24 is an upper balance fulcrum stand.

Claims (1)

(57) [Scope of utility model registration request] 1. A calibration device for a power test device used for calibration of a power test device such as an electric dynamometer or a torque meter, one end of which is fixed to an oscillator or an element shaft of the power test device. , A calibration arm having a metal fitting connection portion formed at the other end, and a calibration balance that is connected in parallel with the calibration arm via a connecting metal fitting and urges the calibration arm upward or downward, and the power test device. A pair of upper and lower balance fulcrums, which are installed on the fixed part and correspond to the left rotation side calibration and the right rotation side calibration, and are formed at one end of the calibration balance, and are used for left rotation side calibration or right rotation side calibration. A pair of arm side connection parts connected to the balance fulcrum stand or the above-mentioned connecting fitting, and another end part of the calibration balance, which is used for either left rotation side or right rotation side calibration weight. But Ri power testing device for the calibration apparatus being characterized in that comprises a pair of calibration weight mounting portion attached.