JP2564157Y2 - Calibration arm for torque meter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calibration arm used for torque meter calibration in a rotary torque meter of a power train type tester.

[0002]

2. Description of the Related Art Generally, a power train type tester as shown in FIG. 6 is used for testing a specimen such as a torque converter of a vehicle. This tester connects the main shafts of two DC motors 1 with a joint 2 and a joint 3 of the output shaft.
And is connected to the torque meter 4 via a.

When a test of the test piece 6 is performed by this tester, the main shaft of the torque meter 4 is connected to a shaft portion of the test piece 6 on a carrier support 7 via a joint 5. Then, a test is performed in which the two DC motors 1 are driven to detect the rotating torque while rotating the specimen 6.

In such a tester, a torque meter 4 is provided before and after the test of the specimen 6 in order to ensure accurate torque detection.
0 adjustment and 100% calibration are performed.

In the calibration work, one end of the torque meter 4 is first locked. Next, the specimen 6 is removed from the joint 5 at the other end of the torque meter 4. This operation is performed by removing the bolt 8 and the nut 9 of the joint 5 shown in FIG. 7, and removing the element 10, the large washer 11 and the washer 16. The removed specimen 6 is lifted by a hoist and set aside.

The joint member 5a on the torque meter 4 side
Is attached with a calibration arm 12. As shown in FIG. 9, the calibration arm 12 is formed integrally with an arm portion 12b extending from the center plate portion 12a to both the left and right sides. A suspension ring 13 is attached to an end of each arm portion 12b so that the ball receiving weight 14 can be suspended. Through holes 15 for bolts are drilled at a plurality of predetermined positions of the central plate portion 12a of the calibration arm 12. Then, the center plate portion 12a of the calibration arm 12 is fastened to the joint member 5a at the end using a bolt 17, and is set in an adjusted state. In this state, the weight 14 is weighted or reduced to adjust the torque of the reference weight value,
The adjustment is completed by adjusting the amplifier 18 on the torque meter 4 side and adjusting the display on the display unit 19.

[0007]

In the calibration arm of the conventional torque meter as described above, a lifting machine such as a hoist or the like is required to remove the specimen 6 when performing the calibration operation of the torque meter 4. After the calibration, the joint 5
When the test piece 6 is connected via the, it is difficult to increase the accuracy of aligning the axis of the test piece 6 with the axis of the torque meter 4. For this reason, when testing the test specimen, equipment such as a hoist is required for the calibration work of the torque meter, and there is a problem that a large amount of time and labor is required, resulting in poor work efficiency.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a new calibration arm of a torque meter capable of performing calibration work easily and quickly without requiring a hoist or other equipment.

[0009]

SUMMARY OF THE INVENTION The calibration arm of the torque meter according to the present invention is provided for receiving the bolt head at the end of the bolt through hole at a position corresponding to the through hole of the joint member on the center plate of the calibration arm. The central plate portion is provided with a bolt fitting hole formed integrally with the hidden hole, and a positioning groove is formed in the side surface portion of the central plate portion so as to be fitted into the joint member and positioned. I do.

[0010]

With the above construction, when the calibration arm is attached to the joint member, the calibration arm is lowered from the lower side surface of the positioning groove of the calibration arm so as to rub against the joint member to form the positioning groove around the joint member. Easy and accurate positioning can be achieved simply by fitting.

When the bolt is inserted into the bolt fitting hole of the calibration arm and fastened to the joint member, the bolt head can be accommodated in the hidden hole of the bolt fitting hole so as not to protrude from the side surface. It can be attached to a small gap between two joint members.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the calibration arm of the torque meter according to the present invention will be described below with reference to FIGS. In FIGS. 1 to 5, portions corresponding to the above-described conventional example shown in FIGS. 6 to 9 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the figure, 5 is a joint, 5a is a torque motor side joint member, 5b is a specimen side joint member, 1
2 is a calibration arm, and 12a is a center plate.

In the center plate portion 12a of the calibration arm 12, bolt fitting holes 20 are drilled at a plurality of predetermined positions corresponding to the connection through holes 23 of the joint member 5a. Bolt fitting hole 2
No. 0 is formed as a series of perforations of a hidden hole 20b in a bolt through hole 20a. In this embodiment, a countersunk hole is formed as the hidden hole 20b, but the countersunk hole is not limited to the countersunk hole, and may be any shape hole as long as the head of the bolt can be fitted and hidden. Of course.

A positioning groove 21 is provided on the side of the calibration arm 12 which faces the joint member 5a on the torque motor side at the center plate portion 12a.

As shown in FIG. 4, the positioning groove 21 is provided with a semicircular groove 21a near the upper side of the central plate 12a, and a groove 21b integrally formed therewith is formed at the lower end of the central plate 12a. It is formed to be open. Further, the arc-shaped peripheral surface 21c of the semicircular groove 21a is formed so as to conform to the shape of the outer peripheral portion of the joint member 5a when the calibration arm 12 is attached to the joint member 5a.

Next, a case where the calibration of the torque meter is performed using the calibration arm of the present embodiment configured as described above will be described. In this case, first, the bolt 8, the nut 9, the element 10, the large washer 11, and the washer are changed from the state in which the torque meter 4 and the specimen 6 are connected by the joint 5 as illustrated in FIGS. 16 is removed. Next, the calibration arm 12 of this example is attached to the joint member 5a of the joint 5. At this time, the two joint members 5a and 5b are rubbed so that the bottom surfaces of the positioning grooves 21 of the calibration arm 12 are rubbed.
The calibration arm 12 is properly positioned at a position where the circular arc peripheral surface 21c is placed on the outer peripheral portion of the torque meter side joint member 5a. Next, the bolt fitting holes 20 of the calibration arm 12 are aligned with the through holes 23 of the torque meter side joint member 5a, and the large washer through holes 22 of the specimen side joint member 5b are aligned with the through holes 23. .
Then, the headed bolt provided with a hexagonal hole inserted through the large washer through hole 22 is also inserted into the large washer through hole 2.
2 through the bolt fitting hole 20 and into the through hole 23 of the torque meter side joint member 5a using a tool passed therethrough. Next, the specimen side joint member 5b is rotated by a required angle, the large washer through hole 22 is aligned with the other bolt fitting hole 20, and the headed bolt is fastened in the same manner as described above. In this way, all the head bolts are further fitted into the plurality (four in this example) of the bolt fitting holes 20 of the calibration arm 12, and the calibration arm 12 is fastened to the torque meter side joint member 5 a, and the adjustment state is established. set.

Next, calibration is performed in the same manner as in the prior art. That is, one end of the torque meter is axially locked, and the weight of the reference weight is adjusted by adding or subtracting the weight, and the amplifier of the torque meter is adjusted to adjust the display to complete the adjustment operation.

Next, after the adjustment operation, the headed bolt is removed by the operation reverse to the above, and the calibration arm 12 is removed. Then, the bolt 8, the nut 9, the emment 10, the large washer 11 and the washer 16 are attached to connect the torque meter side joint member 5a and the specimen side joint member 5b. By doing so, the torque meter and the specimen are in the same connection state before and after the calibration work, so that the centering work at the time of reconnection can be omitted. It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0019]

As described in detail above, according to the calibration arm of the torque meter of the invention, the bolt head is provided at the end of the bolt through hole at the position corresponding to the through hole of the joint member on the center plate of the calibration arm. Bolt holes are formed with integrated concealed holes to accommodate the parts, and open from the area around the groove to be fitted to the joint member on the side surface of the center plate and positioned at the lower end of the center plate. When the calibration arm is attached to the joint member, it is lowered from the lower side of the positioning groove of the calibration arm so as to slide on the joint member, and the positioning groove is formed around the joint member. There is an effect that positioning can be performed easily and accurately simply by fitting the.

When the bolt is inserted into the bolt fitting hole of the calibration arm and fastened to the joint member, the bolt head can be accommodated in the hidden hole of the bolt fitting hole so as not to protrude from the side surface. There is an effect that it can be attached to a small gap between two joint members.
Therefore, when attaching the calibration arm to the torque meter side joint member, it is not necessary to remove the specimen side joint member,
There is an effect that no equipment such as a hoist is required, labor can be saved, and work time can be reduced. Furthermore, when the joint is assembled and connected after the completion of the calibration operation using the calibration arm, the connection state between the torque meter and the specimen becomes the same as before the calibration operation, so that the centering operation can be omitted. .

The calibration arm of the present invention has a simple structure, is lightweight, and can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a torque meter according to the present invention when attached to a joint showing one embodiment of a calibration arm.

FIG. 2 is a front view of a torque meter side joint member to which the lightweight arm of the embodiment is to be attached.

FIG. 3 is a front view of a specimen side joint member in the embodiment.

FIG. 4 is an essential part front view showing a central plate portion of the calibration arm of the embodiment.

FIG. 5 is a longitudinal sectional view of a main part of a center plate of the calibration arm of the embodiment.

FIG. 6 is an overall schematic side view of a conventional powertrain tester having a torque meter using a calibration arm.

FIG. 7 is a vertical cross-sectional side view of a joint part for connecting the above-described conventional torque meter and a specimen.

FIG. 8 is a longitudinal sectional side view showing a state where a calibration arm is attached to the torque meter side joint member of the conventional example.

FIG. 9 is a front view showing the calibration arm of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... DC motor 4 ... Torque meter 5 ... Joint 5a ... Joint member 5b ... Joint member 6 ... Specimen 8 ... Bolt 9 ... Nut 10 ... Element 11 ... Large washer 12 ... Calibration arm 12a ... Central plate part 12b ... Arm part 20: Bolt fitting hole 20a: Bolt through hole 20b: Hidden hole 21: Positioning groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A calibration arm attached to a joint of a torque meter, wherein a bolt fitting hole integrally formed with a hidden hole for accommodating a bolt head at an end of a bolt through hole provided in a calibration arm center plate portion; A calibration arm for a torque meter, comprising: a positioning groove provided in a center plate portion and fitted to the joint member to enable positioning.