JP4133793B2 - Dynamometer calibration arm mounting structure - Google Patents

Description

  The present invention relates to a dynamometer used for torque measurement.

  As the dynamometer, a roller that simulates a road surface with respect to a vehicle driving wheel, a dynamometer that rotationally drives the roller provided to be swingable, a fixed arm that is connected to the dynamometer, and a roller that is driven by the vehicle driving wheel. A dynamometer connected to an engine output shaft or an automobile drive shaft, and a chassis dynamometer including a load cell that measures torque applied to the dynamometer as a load applied to a fixed arm connected to the dynamometer, and the dynamometer Engine bench and drive system used to measure engine output torque with a fixed arm connected to the load and a load cell that measures the torque applied to the dynamometer by the engine as a load applied to the fixed arm connected to the dynamometer Test devices are known.

Also, as a dynamometer calibration technique, in a chassis dynamometer, a calibration arm that extends the fixed arm is attached to a fixed arm, and a weight is suspended on the calibration arm, and a load cell for a known load due to the weight. A technique for calibrating the measured value is known (for example, Patent Document 1).
Here, in this technique, in order to realize the attachment of the calibration arm that does not require a tool or the like to the fixed arm, a set of through-holes having two or more arrangement relations and the same diameter in each of the fixed arm and the calibration arm. Is provided. Then, in the state where the calibration arm is arranged so that each through-hole of the calibration arm overlaps with each through-hole of the fixed arm, the two through-holes are set for each of the two sets of through-holes that overlap. By inserting a pin so as to penetrate, the fixed arm is attached to the calibration arm.
JP 2003-139632 A

According to the technique of connecting the calibration arm to the fixed arm using the through hole and the pin, the following problems occur in the mounting operation of the calibration arm.
First, in order to increase the positional accuracy of attaching the calibration arm to the fixed arm, it is necessary to make the tolerance between the through hole and the pin small. In this case, the through holes are overlapped with each other. Since it is difficult to position the calibration arm and insert the pin into the through hole, it is difficult to easily attach the calibration arm to the fixed arm.

Second, the comparatively heavy calibration arm is held in a predetermined position with respect to the fixed arm for a relatively long time until the insertion of all the pins into the through holes is completed. There must be.
That is, according to this technique, it is not possible to sufficiently facilitate the work of attaching the calibration arm to the fixed arm while maintaining the accuracy of the position where the calibration arm is attached to the fixed arm.
Therefore, an object of the present invention is to facilitate the work of attaching the calibration arm to the fixed arm while maintaining the accuracy of the position where the calibration arm is attached to the fixed arm.

  To achieve the above object, the present invention provides a dynamometer comprising a roller for mounting a vehicle drive wheel, a dynamometer for rotationally driving the roller, and a fixed arm connected to the dynamometer, and extending the fixed arm. A calibration arm for supporting a calibration weight, which is connected to the fixed arm so as to be detachable in a form to be fixed, a pin is fixed to the fixed arm, a hook is fixed to the calibration arm, By hooking the hook of the calibration arm to the pin of the fixed arm, the hook and the pin come into contact, and the fixed arm side end surface of the calibration arm and the calibration arm side end surface of the fixed arm The calibration arm is positioned and connected to the fixed arm.

  According to such a dynamometer, the calibration arm can be connected to the fixed arm with a simple operation by simply hooking the hook portion provided on the calibration arm on the pin provided on the fixed arm. In addition, the connection between the hook and the pin and the contact between the fixed arm side end surface of the calibration arm and the calibration arm end surface of the calibration arm can be surely achieved with high mounting position accuracy. Can do.

  More specifically, the present invention provides, for example, a calibration arm for supporting a calibration weight connected to the fixed arm so as to be detachable from the dynamometer so as to extend the fixed arm. In addition, the fixed arm is provided with pins that stand up from the left and right side surfaces as viewed in the arm length direction of the fixed arm at the end opposite to the connecting end with the dynamometer. The calibration arm protrudes in a direction in which the fixed arm is connected from the arm main body provided on the left and right sides of the arm main body and the arm length of the calibration main arm of the arm main body, respectively. And the hooks provided on the left and right sides of the fixed arm are respectively hooked by lowering the calibration arm from above and lowering the calibration arm from the upper side. By doing so, the hook and the pin that hooks the hook abut, and the fixed arm side end surface of the calibration arm and the calibration arm side end surface of the fixed arm abut, The calibration arm is positioned and connected to the fixed arm.

  By doing so, it is possible to realize the connection of the calibration arm to the fixed arm by a simple operation of simply lowering the calibration arm from above and hooking the hook portion on the pin provided on the fixed arm. it can. In addition, as described above, the contact between the hook and the pin and the contact between the end surface on the side of the fixed arm of the calibration arm and the end surface of the calibration arm on the calibration arm ensured high mounting position accuracy. Connection can be realized.

In such a dynamometer, the right and left side surfaces of the fixed arm are each provided with a plurality of pins that come into contact with the hook when the calibration arm is connected. This is preferable for improving accuracy.
Such a dynamometer can be applied as a chassis dynamometer including a roller on which a vehicle driving wheel is mounted, which is rotationally driven by the dynamometer.

  As described above, according to the present invention, it is possible to facilitate the work of attaching the calibration arm to the fixed arm while maintaining the accuracy of the position where the calibration arm is attached to the fixed arm.

Hereinafter, embodiments of the present invention will be described taking application to a chassis dynamometer as an example.
FIG. 1 schematically shows the overall configuration of the chassis dynamometer according to the present embodiment. Here, FIG. 1a is a schematic top view of the chassis dynamometer, and FIG. 1b is a schematic side view of the chassis dynamometer.
As shown in the figure, the chassis dynamometer measures various characteristics of the automobile advanced on the pit 10 with the chassis dynamometer 2 arranged in the pit 10.
That is, the chassis dynamometer 2 includes, as main components, a roller 21, a dynamometer 22 provided to be able to swing and rotate the roller 21, and two fixed arms 23 connected to both sides of the frame of the dynamometer 22. The load cell 24 is included. The chassis dynamometer applies torque to the vehicle driving wheel via the roller 21 by the dynamometer 22 while the vehicle driving wheel of the vehicle advanced on the pit is placed on the roller 21 and travels. Thus, the torque applied from the driving wheels to the fixed arm 23 via the roller 21 and the dynamometer 22 is measured.

Next, the detailed structure of such a chassis dynamometer is shown in FIG.
In the figure, a is a front view of the chassis dynamometer, b is a right side view of the chassis dynamometer, and c is a top view of the chassis dynamometer. However, the right side view of b in the figure shows a form seen through the roller 21 (shown by a broken line).
As shown in the figure, in the present chassis dynamometer, a shaft 28 is rotatably supported by a bearing column 26 fixed to a base 25 via a bearing 27, and rollers 21 are provided at both left and right ends of the shaft 28. Connected to rotate together. The dynamometer 22 is supported so as to be swingable with respect to the bearing column 26 via a shaft 28 and a bearing 27.

  Then, the dynamometer 22 swings with respect to the base 25 in accordance with the torque applied to the roller 21 by the vehicle drive wheels. Therefore, by measuring the load applied to the fixed arm 23 fixed to the dynamometer 22 with the load cell 24, the action between the roller 21 and the vehicle driving wheel can be measured.

Now, in such a chassis dynamometer configuration, two pins 29 erected in the horizontal direction are arranged vertically on the opposite sides of the connecting end of each fixed arm 23 to the dynamometer 22 and arranged on both sides. Is provided.
Then, as shown in d in the figure, a hook part 31 fixed to one end of the arm main body 30 of the calibration arm 3 is hung from above on the pin 29, so that the calibration is performed as shown in d in the figure. The arm 3 is hooked on both the fixed arms 23, and the calibration arm 3 is detachably connected to the fixed arm 23 in a form in which the fixed arm 23 is extended.

The weight 33 can be placed on a wedge-shaped weight hook 32 that is pointed upward and is provided on the side of the calibration arm 3 opposite to the connection side to the fixed arm 23. By hanging a weight ring 34 on the upper part of the stage 35, the fishing stage 35 is hung from the calibration arm 3. Then, by placing the desired number of weights 33 on the left and right fishing stage 35 respectively on the fishing stage 35, the desired torque by the weight 33 is applied to the fixed arm 23 via the calibration arm 3, and the load cell Calibration is performed. .
Hereinafter, the details of such a detachable connection structure between the calibration arm 3 and the fixed arm 23 will be described.
FIG. 3 shows a structure of a connecting portion between the calibration arm 3 and the fixed arm 23.
Here, in the figure, a represents the upper surface of the connecting portion of the calibration arm 3, b represents the side surface of the connecting portion of the calibration arm 3, and c represents the lower surface of the calibration arm 3. Further, d represents a cross section taken along the line AA in FIG. A, and e represents a cross section taken along the line BB in FIG. F shows a perspective view of the calibration arm 3 as viewed obliquely from below. In each drawing, the connecting portion of the fixed arm 23 is indicated by a broken line.

  As shown in the figure, the hook portion 31 of the calibration arm 3 is fixed to the arm main body 30, and the both side surfaces of the arm main body 30 are provided outside the side surface in the direction of extending the side surface. The protruding plate has a plate portion parallel to the side surface, and the plate portion is provided with a notch that forms a hook that opens downward. And between the part which protruded from the side surface of the arm main body 30 of the two board parts each provided in the outer side of the both sides | surfaces of the arm main body 30 is open upward and downward. Note that the hook portion 31 is fixed to the arm body 30 by any appropriate fixing technique such as fastening with a bolt, bonding with an adhesive, or welding.

Now, the end surface of the arm body 30 on the connection side with the fixed arm 23 is a plane perpendicular to the arm length direction of the arm body 30, and the end surface of the fixed arm 23 on the connection side with the calibration arm 3 is the fixed arm. 23 is a plane perpendicular to the arm length direction.
Then, by hooking hooks formed by notches in the two plate portions of the hook portion 31 of the calibration arm 3 to the pins 29 provided on both side surfaces of the end portion of the fixed arm 23, the calibration arm 3 and the fixed arm 23 are The position of the pin 29 of the fixed arm 23 so that the end surface of the calibration arm 3 on the connection side with the fixed arm 23 and the end surface of the fixed arm 23 on the connection side with the calibration arm 3 are in surface contact with each other without any inclination or gap. The positions and shapes of the notches in the two plate portions of the hook portion 31 of the calibration arm 3 are determined. That is, the length L1 from the calibration arm end surface to the inner surface from the notched dynamometer 22 is a length obtained by adding a predetermined tolerance to the length L2 from the fixed arm end surface to the end of the pin 29 from the dynamometer 22. It is said. Further, the position of the pin 29 of the fixed arm 23 and the position and shape of the notches of the two plate portions of the hook portion 31 of the calibration arm 3 are the same as when the notch of the calibration arm 3 is hung on the pin 29 of the fixed arm 23. Further, the upper surface height of the fixed arm 23 and the upper surface height of the calibration arm 3 are set to be equal.

  When the hook of the calibration arm 3 is hooked on the pin 29 of the fixed arm 23 and the both are connected, the calibration arm 3 has a contact point between the notch and the pin 29 of the fixed arm 23 and the calibration. By the surface contact between the end surfaces of the arm 3 and the fixed arm 23, the fixed arm 23 is supported without rattling.

Next, FIG. 4 shows a procedure for connecting the calibration arm 3 to the fixed arm 23.
As shown in the figure, the calibration arm 3 is attached to the fixed arm 23 by first lifting the calibration arm 3 above the fixed arm 23. Then, the calibration arm 3 is tilted and lowered so that the connecting side is downward, and the fixed arm 23 is positioned between the two plate portions so that the pin 29 is in contact with the inside of the notch (a).

Then, when the inclination of the calibration arm 3 is returned to the horizontal position from this state (b, c), the calibration arm 3 is lowered by its own weight so that the pin 29 is inserted between the cutouts. Arranged at the proper coupling position shown.
The detachment of the calibration arm 3 from the fixed arm 23 can be performed by a procedure reverse to the above.
The embodiment of the present invention has been described above.
As described above, according to the present embodiment, the calibration arm 3 is simply connected to the fixed arm 23 by simply hooking the hook portion 31 provided on the calibration arm 3 on the pin 29 provided on the fixed arm 23. Can be carried out with high accuracy of the mounting position.
In the above description, the application to the chassis dynamometer has been described as an example. However, the connection structure of the calibration arm 3 to the fixing arm 23 according to the present embodiment is the above-described engine bench, drive system test apparatus, and other components. The present invention can be applied as a connecting structure of a calibration arm to a fixed arm in an arbitrary dynamometer having a fixed arm.

It is a figure which shows the whole structure of the chassis dynamometer which concerns on embodiment of this invention. It is a figure which shows the structure of the chassis dynamometer which concerns on embodiment of this invention, and the structure of attachment to the fixed arm of the calibration arm. It is a figure which shows the structure of the connection part of the calibration arm which concerns on embodiment of this invention. It is a figure which shows the attachment procedure of the calibration arm which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Chassis dynamometer, 3 ... Calibration arm, 21 ... Roller, 22 ... Dynamometer, 23 ... Fixed arm, 24 ... Load cell, 25 ... Base, 26 ... Bearing column, 27 ... Bearing, 28 ... Shaft, 29 ... Pin , 30 ... arm body, 31 ... hook part, 32 ... weight hook, 33 ... weight, 34 ... weight ring, 35 ... under fishing stage.

Claims (4)

A dynamometer with a fixed arm fixedly connected to the frame,
A calibration arm for supporting a calibration weight, which is connected to the fixed arm so as to be detachable in an extended form of the fixed arm;
A pin is fixed to the fixed arm,
A hook is fixed to the calibration arm,
By hooking the hook of the calibration arm on the pin of the fixed arm, the hook and the pin come into contact, and the fixed arm side end surface of the calibration arm and the calibration arm side of the fixed arm The dynamometer characterized in that the calibration arm is positioned and connected to the fixed arm in a form in contact with the end face. A dynamometer with a fixed arm fixedly connected to the frame,
A calibration arm for supporting a calibration weight, which is connected to the fixed arm so as to be detachable in an extended form of the fixed arm;
The fixed arm has pins standing up from the side surfaces provided on the left and right side surfaces as viewed in the arm length direction of the fixed arm of the fixed arm at the end opposite to the connecting end with the dynamometer. ,
The calibration arm protrudes in a direction in which the fixed arm is connected from the arm main body provided on the left and right sides of the arm main body and the arm length of the calibration main arm of the arm main body, respectively. And has a hook opened downward,
The calibration arms are lowered from above, and the hooks provided on the left and right sides of the calibration arm are respectively engaged with the pins provided on the left and right side surfaces of the fixed arm. The fixed arm contacts the fixed arm side end surface of the calibration arm and the calibration arm side end surface of the fixed arm, and the calibration arm is positioned relative to the fixed arm. And a dynamometer characterized by being coupled. The dynamometer according to claim 2, wherein
The dynamometer is characterized in that a plurality of pins that come into contact with the hook when the calibration arm is connected are provided on the left and right side surfaces of the fixed arm, respectively. A dynamometer according to claim 1, 2 or 3,
A chassis dynamometer comprising: a roller on which a vehicle driving wheel is mounted, which is rotationally driven by the dynamometer.

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