JPH043240Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a load cell switching device for an electric dynamometer that measures rotational force.

[Conventional technology]

An eddy current type electric dynamometer consists of an inductor, which is a rotating part that is pivotally attached to a shaft, and a yoke, an excitation coil, and an eddy coil that are pivotally supported in the outer circumferential direction of the inductor through the air. The torque arm extends horizontally from the swinging part, and the torque arm is connected to a load cell for detecting torque.

The shaft is directly connected to the output shaft of the machine under test, such as an automobile engine, and when the shaft is turned by the test object and the inductor rotates, the yoke,
A closed circuit magnetic flux is generated through the eddy current ring, the air, and the inductor, and the magnetic flux density in the air portion pulsates, creating a starting force in the eddy current ring and causing the eddy current to flow, causing the swinging part to swing. The torque of the machine under test is detected using a load cell via the integrated torque arm. Note that the DC electric dynamometer is also similar in that the swinging section swings to detect torque.

FIG. 3 is a front view of an electric dynamometer equipped with a conventional load cell switching device described in Japanese Utility Model Publication No. 58-52505. In Figure 3, 1 is bed, 2
1 is a bearing stand attached to the bed 1, and 3 is a shaft to which an inductor, which is a rotating part (not shown), is pivotally attached. 4 is a swingably supported frame, and torque arms 6 are attached from both sides of the frame.
extends horizontally. The frame 4 is concentrically and swingably supported by a shaft 3 which is made up of a yoke (not shown), an excitation coil, an eddy current ring, a bracket for attaching these, and the like. 8 is a load cell provided corresponding to the torque arm 6 extending left and right, and 9 is a load cell switching device.

Next, FIG. 4 is an enlarged view of the load cell switching device 9. FIG. 4a is a front view of the load cell switching device 9 in a locked state, FIG. 4b is a front view of the load cell switching device 9 in an unlocked state, and FIG. FIG. 4c is a plan view of the load cell switching device. In Figure 4,
Reference numeral 10 denotes an outer frame, the lower end portion 10a of which is connected to the actuating rod 11 of the load cell by screwing.

The outer frame 10 has an opening 12 formed laterally in the center thereof, in which the end of the torque arm 6 is located. The opening 12 is open at its upper end, and its lower end is designated by reference numeral 12a as the bottom. The outer frame 10 is divided into a front side part 10a and a rear side part 10b by an opening 12, and an opening 13 is formed in the front and rear sides 10a and 10b in a direction perpendicular to the opening 12. .

The opening 13 is vertically long between the top edge 13a and the bottom edge 13b, and the constriction 1 of the switching piece 14 is movable up and down along the opening 13.
4a is fitted. The switching pieces 14 form a pair of upper and lower pieces, and support a shaft pin 15 passing through the torque arm 6 in the lateral direction by their respective concave receiving portions 14a.

The upper and lower switching pieces 14 each have switching bolts 16.
and 17, it is held at a predetermined height position. That is, the upper and lower switching bolts 16 are
a is rotatably inserted and supported by the upper edge 13a of the outer frame 10, and the tip thereof is connected to the switching piece 14.
It is screwed into the screw hole 14b of the screw hole 14b. Further, the lower switching bolt 17 is supported with its shaft portion 17a rotatably and prevented from coming off on the bottom edge 13b of the opening 13, and its tip can be moved back and forth into the screw hole 14b of the switching piece 14. They are freely screwed together. 18 and 19 are upper and lower switching bolts 16 and 17
The lock nut screwed into the switch prevents the switching bolt and switching piece from loosening. Further, reference numeral 5 denotes stoppers provided on both sides of the central portion of the aperture 13 to restrict movement of the vertical switching piece 14 toward the center.

In the electric dynamometer having the above configuration, among the left and right torque arms 6 shown in FIG. 3, the switching device 9 on the side used for torque detection is locked in the state shown in FIG. 4a, and the switching device 9 on the side not used is locked in the state shown in FIG. 4. Release the lock in the state shown in Figure b. That is, in FIG. 4a,
The upper and lower switching pieces 14 each have switching bolts 1
6 and 17, the shaft pin 15 is moved up and down by the concave receiving portion 14a with a play of about 0.1 mm. Therefore, when testing the machine under test using an electric dynamometer, the vibration of the torque arm 6 transmitted through the frame 4 is
is transmitted to the load cell by this switching device 9,
Torque detection can be performed.

On the other hand, when the switching device 9 is in the unlocked state as shown in FIG. During the test, the shaft pin 15 swings integrally with the other torque arm, and even if this shaft pin 15 swings, the movement is not transmitted to the load cell on the unlocking side. In order to eliminate the inconvenience that the load cell switching devices 9 of both torque arms are locked at the same time due to a mistake during the locking operation, a limit switch (not shown) is provided on the side of the outer frame 10, and the operating lever of the limit switch is It is activated when the lower switching piece 14 moves to a predetermined position.

[Problem that the invention attempts to solve]

In the conventional load cell switching device configured as described above, the operator must go to the location where the electric dynamometer is located, perform load cell switching work, and release or lock the left and right load cell switching devices 9, respectively. However, there was a problem that it was time-consuming.

This invention was made to solve the above problems, and it selects the load cell by remote control.
It is an object of the present invention to provide a load cell switching device for an electric dynamometer that can lock and unlock the selected load cell.

[Means for trying to solve problems]

Therefore, the present invention consists of a rotating part that is pivoted to the shaft, a frame that is swingably supported with a space between the rotating part and the space around the outer periphery of the rotating part, a torque arm that is integrally provided with the frame, and a torque arm. A first load cell and a second load cell are suspended at a predetermined interval from each other, each having a recessed portion at the bottom thereof, and the recessed portion facing the lower end of the first load cell and the second load cell, respectively. a first hook and a second hook that are attached to each other; a slide key that can be freely fitted into and removed from the recessed portions of the first hook and the second hook; has an actuator for fitting the slide key into either one of the recesses, an operation means for remotely controlling the actuator, and a guide for guiding the sliding of the slide key, and the hook with the slide key fitted is rotated via the guide. The load cell switching device of the electric dynamometer is composed of a fixed key box that is supported and fixed to the base of the electric dynamometer.

[Effect]

In the load cell switching device of the electric dynamometer configured as described above, when either the first load cell or the second load cell is selected and the operating means is operated, the actuator is operated and the slide key is pressed to load the selected load cell. The load cell is moved in the clock direction and fits into the recess of the hook attached to the selected load cell, thereby supporting and fixing the selected load cell.
In addition, the unselected load cells are suspended from the torque arm in a free state.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a load cell switching device for an electric dynamometer according to the present invention, in which FIG. 1a is a front view, FIG. 1b is a side view, and FIG. It is a sectional view along the A line. Note that in FIG. 1, parts that perform the same functions as those in FIG. 3 are designated by the same reference numerals, and the explanation thereof will be omitted.

In FIG. 1, 20, 20a are load cells (first load cell, second load type) with different weighing capacities suspended from the torque arm 6 by a ball joint 21 at a predetermined interval; A first hook and a second hook 22a each have a recessed portion at the bottom thereof, and are attached to the lower end portions of the load cells 20 and 20a, respectively, with the recessed portions facing each other.
is a fixed key box provided in bed 1, 24
25 is a slide key that can be fitted into and removed from each recess of the first hook 22 and second hook 22a, and 25 is a slide key 24 attached to the fixed key box 23.
This is a guide. Fixed key box 23 is hook 2
2, 22a are stored, and when the slide key 24 moves along the guide 25 and fits into the recess of either the first hook 22 or the second hook 22a, the slide key 24
The fitted hook is supported and fixed to the bed via the guide 25. 26 is a hydraulically driven actuator, and 27 is connected to the actuator 26 via a metal fitting 28.
An actuator rod 29 connects the slide key 24 to the slide key 24, and 29 is an operating means for remotely controlling the actuator 26.

Next, the operation of the load cell switching device for an electric dynamometer according to the present invention will be explained. When the user selects one of the load cells 20, 20a according to the measurement range and presses one of the switches 29a, 29b corresponding to the load cells 20, 20a, for example, the switch 29a, the hydraulic actuator 2
6 is activated, and the slide key 24 is moved to the first hook 22.
direction, fits into the recess of the first hook 22, and presses the first hook 22 against the side wall of the fixed key box 23. By sliding the slide key 24, the load cell 20 to which the first hook 22 is attached is supported and fixed to the bed 1 via the first hook 22, the slide key 24, and the fixed key box 23. On the other hand, the load cell 20a to which the second hook 22a is attached is suspended from the torque arm 6 in a free state.

When the rotating part (not shown) pivotally attached to the shaft 3 rotates in the above state, the frame 4 swings, the swing is transmitted to the load cell 20 via the torque arm 6, and the load cell 20 Then the torque will be measured.

Next, FIG. 2 is a schematic diagram showing another embodiment of the load cell meter switching device for an electric dynamometer according to the present invention,
FIG. 2a is a front view, and FIG. 2b is a side view. Note that in FIG. 2, parts that perform the same functions as those in FIG. 1 are designated by the same reference numerals, and a description thereof will be omitted.

In the embodiment shown in FIG. 1, the load cell 20,
20a, but in this embodiment, the torque arm 6
Load cells 20, 20a are arranged in the axial direction. Since its operation is similar to that shown in FIG. 1, its explanation will be omitted.

In addition, in the embodiment shown in FIGS. 1 and 2,
Two load cells were used, but three were placed on torque arm 6.
It is also possible to suspend more than one load cell and select one of them to support and fix.

[Effect of idea]

As explained above, according to the present invention, there is a rotating part that is pivoted to the shaft, a frame that is swingably supported around the outer periphery of the rotating part with a space between the rotating part and the rotating part, and a frame that is integrated with the frame. a first load cell and a second load cell suspended from the torque arm at a predetermined interval; and a first hook and a second hook attached to the lower end of the second load cell with the recess facing each other, and a slide key that can be freely fitted into and removed from the recess of the first hook and the second hook. an actuator for sliding the slide key and fitting the slide key into a recess of either the first hook or the second hook; an operating means for remotely controlling the actuator; and an actuator for sliding the slide key. By configuring the load cell switching device of the electric dynamometer by a fixed key box having a guide for guiding and supporting and fixing a hook into which the slide key is fitted to the base of the rotating part via the guide, The load cell can be switched by remote control, reducing the burden on the operator.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a load cell switching device for an electric dynamometer according to the present invention, in which Fig. 1a is a front view, Fig. 1b is a side view, Fig. 1c is a sectional view, and Fig. 2 is a FIG. 2 is a schematic diagram showing another embodiment of the load switching device for an electric dynamometer according to the present invention, in which FIG. 2a is a front view and FIG. 2b is a front view;
is a side view, FIG. 3 is a front view of an electric dynamometer equipped with a conventional load cell switching device, FIG. 4 is an enlarged view of the load cell switching device shown in FIG. 3, and FIG. 4b is a front view in an unlocked state, and FIG. 4c is a plan view. In the figure, 1 is the bed, 2 is the bearing stand, 3 is the shaft, 4 is the frame, 6 is the torque arm, 2
0 and 20a are load cells, 21 is a ball joint, 22 and 22a are hooks, 23 is a fixed key box, 24 is a slide key, 25 is a guide, 26 is an actuator, 27 is an actuator rod, 28
29 is a metal fitting, and 29 is an operating means. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A rotating part pivotally attached to a shaft, a frame supported swingably around the outer periphery of the rotating part with space between the rotating part and the rotating part, and a frame integrally attached to the frame. A torque arm provided, a first load cell and a second load cell suspended from the torque arm at a predetermined interval, each having a recessed portion at the bottom thereof, the first load cell and the second load cell respectively having a recessed portion at the bottom thereof. a first hook and a second hook attached to the lower end of the second load type with the recesses facing each other; a slide key that can be freely fitted into and removed from the recesses of the first hook and the second hook; Slide the slide key to select the first
an actuator for fitting the slide key into either the hook or the recess of the second hook; operating means for remotely controlling the actuator; and a guide for guiding the slide of the slide key; 1. A load cell switching device for an electric dynamometer, comprising: a fixed key box for supporting and fixing a hook into which the slide key is fitted to a base of the rotating section. (2) The load cell switching device for an electric dynamometer according to claim 1, wherein the first load cell and the second load cell have different weighing capacities. (3) The load cell switching device for an electric dynamometer according to claim 1, wherein the actuator is a hydraulically driven actuator.