JPH0134331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque measuring device for a dynamometer that measures the output of an internal combustion engine or the like.

FIG. 1 is a side view showing the main parts of a conventional dynamometer torque measuring device, and FIG. 2 is a front view of FIG. 1.
In FIGS. 1 and 2, the swinging section 1 of the dynamometer
In FIG. 1, torque, which is the output of an internal combustion engine, is applied in the clockwise and counterclockwise directions around a shaft (not shown). The base plate 2 swingably supports a shaft (not shown) of the swinging section 1 of the dynamometer via a swing bearing (not shown).
The torque arm 3 is fixed to the swinging part 1 of the dynamometer,
The tip portion 301 is formed to protrude in the horizontal direction and transmits the torque applied to the swinging portion 1 of the dynamometer. The tension/compression type load converter 4 is, for example, a load cell, and its upper end is rotatably attached to the tip 301 of the torque arm 3 via a first attachment 5a, and its lower end is attached to a second attachment. It is rotatably attached to the base plate 2 via a tool 5b.

Next, the operation will be explained. Dynamometer swinging part 1
The torque, which is the output of an internal combustion engine, etc., applied to
The torque is transmitted to the tension/compression type load converter 4 via the torque arm 3 and the first fixture 5a, and the tension/compression type load converter 4 outputs an electrical signal in accordance with the applied load.

It is known that the tension/compression type load transducer 4 is generally damaged when displacement is applied thereto. For this reason, in the past, the tension-compression type load converter 4 was attached between the base plate 2 and the torque arm 3 via the first and second fixtures 5a and 5b to prevent displacement.

However, the first and second fixtures 5a, 5b
If the tension/compression type load transducer 4 is installed between the base plate 2 and the torque arm 3 via the In cases where the amount of inertia of the swinging section 1 is large, it is necessary to select a tension-compression type load converter 4 that has sufficient overload capacity for the rated torque of the dynamometer. This has resulted in a drawback that the error becomes large when measuring small torques.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the torque transmitted to the torque arm 3 is buffered using a spring and applied to the tension/compression type load transducer 4. It's a thing. An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a partially sectional side view showing a main part of an embodiment of the torque measuring device for a dynamometer according to the present invention;
The figure is a front view of FIG. 3. In the figure, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals. Third
In the figure and FIG.
It is installed through a linear ball bearing 7 to allow linear movement in the vertical direction.
The first and second spring receivers 8 and 9 are screwed into one end and the other end 601 and 602 of the rod 6, respectively, and are fixed by nuts 10 and 11. 12 is rotatably attached to the upper end of the tension/compression type load transducer 4.
The first and second springs 13 and 14 are compression coil springs each having a hollow portion, and a rod 6 is inserted through each hollow portion to create a torque between the lower end of the torque arm 3 and the first spring receiver 8. It is attached between the upper end surface of the arm 3 and the second spring receiver 9. The stopper 15 is fixed to the base plate 2 and the torque arm 3
The distal end portion 301 of the torque arm 3 is inserted through the through hole 151 through the gap A, and the swinging of the distal end portion 301 of the torque arm 3 is restricted.

Next, the operation will be explained. Dynamometer swinging part 1
The torque applied to is transmitted to the torque arm 3, and the torque applied to the first
The signal is transmitted to the second spring receivers 8 and 9, and an electric signal corresponding to the load is generated without causing any displacement in the tension/compression type load converter 4. For example, in FIG. 3, when clockwise torque is generated in the swinging section 1 of the dynamometer, the first spring 13 is compressed and the first
A compressive force can be applied to the tension/compression type load converter 4 through the spring receiver 8 . Conversely, if torque is generated in the counterclockwise direction, the second
By compressing the spring 14, the load is transmitted to the rod 6 via the second spring receiver 9 and the nut 11, and a force in the tension direction can be applied to the tension-compression type load transducer 4. In addition, by adjusting the gap A between the torque arm 3 and the stopper 15 using the spring constants of the first and second springs 13 and 14 and the rated torque of the dynamometer (not shown), the gap A between the torque arm 3 and the stopper 15 can be adjusted. It is possible to select a tension-compression type transducer 4 having a capacity that matches the rated torque of ).

In the above embodiment, the direction of the torque applied to the swinging part 1 of the dynamometer is both clockwise and counterclockwise, but if the torque is applied in one direction, for example, in the clockwise direction. is the first spring 1
3 only, second spring 1 in case of counterclockwise rotation direction
It can be only 4.

As described above, according to the present invention, the torque applied to the swinging section of the dynamometer is transmitted to the tension/compression type load converter via the spring, and the rotation range of the torque arm is limited by the stopper. Even in a dynamometer with a large amount of inertia, by adjusting the distance between the torque arm and the stopper according to the spring constant of the spring and the rated torque of the dynamometer, it is possible to convert the tension-compression type load to the optimal capacity required for measurement. This has the effect of allowing selection of instruments and improving measurement accuracy.

[Brief explanation of drawings]

FIG. 1 is a side view showing the main parts of a conventional dynamometer torque measuring device, FIG. 2 is a front view of FIG. 1, and FIG. 3 is an embodiment of the dynamometer torque measuring device according to the present invention. A partial cross-sectional side view showing the main parts, Figure 4 is the third
FIG. In the figure, 1 is a swinging part, 2 is a base plate, 3 is a torque arm, 301 is a tip, 4 is a tension/compression type load converter, 6 is a rod, 301 is one end, 602 is the other end, and 7 is a Linear ball bearings, 8 and 9 are first and second spring receivers, 10 and 11 are nuts, 1
2 is a pin, 13 and 14 are first and second springs, 15
151 is a stopper, and 151 is a through hole. Note that the same parts in each figure are given the same reference numerals.

Claims (1)

[Claims] 1. A torque arm attached to the swinging part of the dynamometer, a tension-compression type load converter attached to the torque arm via a spring, and a stopper that limits the rotation range of the torque arm. The spring is a compression coil spring having a hollow space, and a rod is attached to the torque arm so as to be movable in the swinging direction of the torque arm. and the torque arm, and the tension/compression type load converter is fixed to a fixed part and rotatably attached to the spring receiver. . 2 The springs are first and second compression springs each having a hollow portion, and the first compression spring has a rod that penetrates the torque arm in its swing direction and is movably attached via a linear ball bearing. The second compression spring is mounted between the torque arm and a first spring receiver attached to one end of the rod by passing through the hollow portion, and the second compression spring is attached to the rod by passing through the hollow portion. The rod is mounted between a second spring receiver attached to the other end of the rod and the torque arm, and a tension-compression type load transducer is fixed to the fixed part and attached to the first spring receiver. A dynamometer torque measuring device according to claim 1, which is rotatably mounted.