JPH0570094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting the rotational torque of an output shaft of a rotating machine, in particular of a shift lever shaft of a transmission connected to an automobile engine.

[Conventional technology] When designing an improved day tent mechanism to enable smoother and more reliable movement of the shift lever for driving an automobile equipped with an automatic transmission, measurement data regarding the torque required to operate the shift lever was prepared. There is a need to.

The conventional method for measuring shift lever torque is to attach a strain sensor to the shift lever itself, input information sent from the rotation angle detector of the shift lever shaft into a dynamic strain meter, and use an xy recorder to measure lever rotation. It was common to have a graph of angle versus rotational torque drawn. Since the shift lever shaft was driven by manually operating the lever, the direction of the force applied to the lever and the speed at which the force was applied were inconsistent even if operated by the same person. ,
Moreover, large individual differences occurred between different operators. In addition to the method of applying the external force for measurement to the strain sensor, there were also problems with the location of the strain sensor. With the conventional method of attaching a strain sensor to the surface of the shift lever, it was not possible to pick up a sufficient amount of strain. Therefore, the measurement data obtained could have an error of as much as ±40% in the torque value and ±16% in the rotation angle.

[Problems to be Solved by the Invention] As explained in the section of the prior art, the conventional method for detecting the shift lever rotational torque of an automatic transmission transmission first involves manually moving the shift lever. The present invention has the following drawbacks: variation in measurement data due to this, and lack of measurement sensitivity due to inappropriate mounting method of the strain sensor.It is an object of the present invention to solve these problems. .

[Means for Solving the Problems] The coaxial angle torque detection device of the present invention connects a joint for connecting a rotating shaft to be measured and a joint for connecting an output shaft of a driving member of the rotating shaft to both shaft ends. a main body portion having at least one bar attached thereto so as to connect flange portions formed on both shaft ends of a rotating body provided in the body; and a rotation angle detector of the rotating body attached to the main body portion. and a strain sensor attached to the bar, and a dynamic strain meter for detecting the rotational torque of the rotating body based on the output from the sensor.

[Operations and Effects of the Invention] The coaxial angle torque detection device of the present invention includes main body portions for transmitting rotational torque for measurement to a rotational shaft to be measured, which are placed opposite each other at an appropriate distance.
It is constructed by connecting at least one or more bars so as to span over a set of flanges serving as a rotary disk having a relatively large diameter, and the bars extend over one of the sets of flanges. By transmitting the generated rotational force to the other flange portion through the bar and attaching a strain sensor to this bar portion, it is possible to detect large stress deformation occurring in the bar.

Further, the rotation angle detector is housed within the space surrounded by the above-mentioned set of flanges and bar in order to utilize this space.

The coaxial angle torque detection device of the present invention having the above configuration has the following effects.

(b) When the rotational axis to be measured is a shift lever shaft of an automatic transmission, the display error in the rotational torque value recorded by the xy recorder due to switching the lever operation from manual to motor drive. The deviation has been drastically reduced from ±40% to ±2%, and the error in rotation angle values has been significantly reduced from ±16% to within ±2%.

(b) The effect of (a) above is largely due to the unique structure of the device of the present invention, which has a sensor mounting location that greatly increases the sensitivity of the strain sensor for detecting rotational torque. The structure also lends itself to miniaturization of the device.

(c) By providing the device with a divisible structure, it is possible to measure objects of various sizes and shapes.

(d) Automation of measurement becomes possible by adopting an electric operation method.

[Example] A coaxial angle torque detection device of the present invention will be described below based on an example shown in the accompanying drawings.

The main body part A of the device includes a flange part 2 to which a connecting joint 1 of a rotating shaft to be measured, in this case a transmission shift lever shaft B of an automatic transmission of an automobile engine, is assembled, and a motor 11 for rotating the shaft B. The output shaft 12 and the flange portion 4 to which the connecting joint 3 is assembled are bridged by two bars 5 and 6 to form a solid cylindrical rotating body that lacks a portion of the cylindrical wall surface as a whole. 2 bars 5,
A rotation angle detector 7 of the main body portion A is attached so as to be fitted between the rotation angle detectors 6 and 6. Further, a strain sensor 8 for detecting the rotational torque exerted on the shaft B and therefore also on the main body portion A is attached to the bar 5, and the output of this strain sensor 8 and the output of the rotation angle detector 7 are The signal is input to an xy recorder 10 via a dynamic strain meter 9. On the other hand, an output shaft 12 of a motor 11 for rotating the shaft B is connected to the joint 3. A rotation control unit 15 for the motor 11 is connected to the motor 11, which is provided with a speed adjustment dial 13, a forward/reverse switch 14, and the like. 16 and 17 are two-part device base parts, 1
8 is a gear box for shifting.

Next, the operation of the device of the present invention will be explained with reference to the above-mentioned FIG. 1 and FIG. 3, which is a perspective view of the detent mechanism for setting the drive position of an automatic transmission for an automobile. Gear transmission shift lever shaft B
is connected to the connecting joint 1, and the power for operating the various attached measuring instruments and motor 11 is turned on. Next, specify the motor rotation conditions according to the test purpose, such as rotation direction, rotation speed, rotation angle, etc., to the control electric circuit unit 15 of the motor 11, and then turn on the motor start switch, and the motor will reach the set rotation speed. Shift lever shaft B begins to rotate. As shown in FIG. 3, the shift lever 30 is assembled with a detent mechanism D for setting the drive position of the lever. There are various types of day tent mechanisms, but in this case, the shift lever 3
0 rotation angle regulation part D1 and manual valve E
A structure in which the control wire 33 is connected to the detent plate portion D2 for stepwise displacement is shown. 31 is a guide plate for a knob 32 attached to the shift lever 30. Shift lever 3 rotating around shift lever shaft B
0 movement causes the detent plate 34 to move around its rotation axis 3 through the back and forth movement of the control wire 33.
Convert it into a rotation motion around 5. A number of wavy recesses a corresponding to the number of drive positions are provided on the outer peripheral edge of the fan-shaped detent plate, and a leaf spring 36 is constantly applied with an acting force to press against this outer peripheral edge. The swinging arm 37 attached to the bifurcated tip comes into pressure contact with the bottom of the wave-like recess, thereby providing an operating force for setting the position of the shift lever 30. Therefore, in the process of moving the shift lever 30 from the P position to the L position or in the opposite direction, the swing arm 3 moves as the detent plate 34 rotates.
7. Based on the pressing force of the leaf spring 36, a rotational restraining force is exerted on the plate 34 in a wave-like manner, and this undulating restraining force is applied to the shift lever 30 via the control wire 33, and ultimately to the shift lever 30. This will be transmitted to the lever shaft B in the form of a stepwise variation in the rotational torque of the shaft. The rotation force of the day tent plate 34 is provided by the connecting rod 3.
8 for the displacement of the spool in the manual shift valve E. The purpose of the device of the present invention is to measure the fluctuation value of the rotational torque of the shaft B corresponding to the operating angle of the shift lever 30 and therefore the rotation angle of the shift lever shaft B.

By the way, as mentioned above, the main body part A of the device is a cylindrical rotating body as a whole, and the connecting bars 5 and 6 bridge the flange-shaped parts 2 and 4 at both ends of the rotating body. However, the bars 5 and 6 are located at a considerable distance from the rotation axis in the radial direction, and are subject to rotational stress and strain as the main body portion A rotates. Therefore, when a strain sensor is attached to the surface of the bars 5 and 6, it is necessary to attach the strain gauge to the abdominal surface of the shift lever 30 as explained in the prior art section. The main body part A has a sensitivity that is incomparable to that of the case.
It becomes possible to detect changes in the rotational stress strain exerted on the shift lever shaft B, and thus fluctuations in the rotational torque appearing on the shift lever shaft B. E in the figure is a manual shift valve. When the shaft B finishes rotating by a predetermined angle, a stop signal is issued to the motor 11 by a position sensor or the like.

Regarding the method of measuring the rotation angle of the shift lever shaft B, it is possible to extremely compactly incorporate a large rotation angle detector 7 coaxially inside the cylindrical main body portion A having a sufficiently large outer diameter, and to measure the rotation angle. Measurement accuracy improves.

Although the strain sensor 8 is attached to each of the bars 5 and 6 of the main body, it may be attached to only one of them. Further, the number of bars is not limited to two, but may be any number as long as the condition that the center of gravity of the main body portion A is located on the axis of rotation thereof is satisfied, and the bar does not necessarily have to be bar-shaped. The flange portions 2 and 4 are not limited to disk shapes, and may also be triangular or polygonal plates, for example. In short, it is sufficient that the main body part A functions as a rotating body having a portion where rotational stress and strain appear large so that the fluctuation value of the rotational torque applied to the shift lever shaft can be detected as magnified as possible via the strain sensor. .

FIG. 2 is a side view, partially in cross section, of a situation in which the device of the present invention shown in FIG. 1 is set in an automatic transmission F to be tested. The rotation angle detector 7 is prevented from rotating by a detector fixing member 19 for setting a reference angle. Numerals 20 and 21 are bolts for fixing the shaft B and the motor output shaft 12. A set of flange portions 2 constituting the main body portion A,
4 and the two bars 5 and 6 may be made integrally in advance by a casting method, but as shown in the figure, the flange part and the bar part have a separate structure, for example, as shown in the figure. If the configuration is such that they are joined together using the fastening bolts 22 and 23 as shown in the figure, each part of the main body part A can be adjusted according to variations in the shape and dimensions of the test object, the magnitude of the measurement torque, or the level of required measurement accuracy. It is convenient to be able to freely change the combination of constituent members. In that case, only the flange portion on one side may be integrally constructed with the bar portion, and only the flange portion on the other side may be detachable.

Unlike conventional devices, the coaxial angle torque detection device of the present invention is configured to move the transmission shift lever not manually but by an electric motor. Since a control circuit can be incorporated to arbitrarily vary rotational torque, rotation speed, rotation direction, etc., various rotating devices other than automatic transmission measurement can be tested by the device of the present invention. If we consider it only for the purpose of obtaining basic data for the improved design of the day tent mechanism of the aircraft, we can switch the input to the transmission shift lever, and therefore the transmission of rotational force to the shift lever shaft, from manual to electric. As a result, variations in measurement data due to the individual differences of the measurer or non-uniformity of lever operation due to mood differences, etc., even by the same person, as already mentioned in the section on conventional technology, can be avoided. , when using the conventional test method, the deviation of rotational torque value reached ±40% and the rotational angle reached ±16%, but the deviation was suppressed to within ±2%, which is better than expected. I was able to do that. Furthermore, by using an electric motor as the measurement input to the non-measurement output shaft, it has become possible to automate a series of measurement tasks.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram including a perspective view of the main body of the device of the present invention, and FIG. 2 is a side view including a partial cross section of the device of the present invention installed on a shift lever shaft of an automatic transmission of an automobile. FIG. 3 is a perspective view of the detent mechanism assembled to the base of the shift lever. In the figure, 1... Joint for connecting the rotating shaft to be measured (transmission shift lever shaft), 2,
4...Flange part, 3...Joint for connecting the output shaft of the motor, 5, 6...Bar, 7...Rotation angle detector, 8
... Strain sensor, 9 ... Dynamic strain meter, 10 ... xy recorder, 11 ... Motor, 12 ... Motor output shaft, 15 ... Motor rotation control unit, 22, 2
3...Flange and bar assembly bolt, 30...
Transmission shift lever, 37... Swing arm, 32... Detent plate, A... Device main body part, B... Shift lever shaft, D...
...Daytent mechanism, F...Automatic transmission.

Claims (1)

[Scope of Claims] 1. A flange portion formed at both shaft ends of a rotating body in which a joint for connecting a rotating shaft to be measured and a joint for connecting a driving member of the rotating shaft are provided at both shaft ends. a main body portion having at least one bar attached thereto so as to connect them; a rotation angle detector of the rotating body attached to the main body portion; a strain sensor attached to the bar; and an output from the sensor. A coaxial angle torque detection device comprising a combination with a dynamic strain meter for detecting the rotational torque of the rotating body based on. 2. The coaxial angle torque detection device according to claim 1, wherein the two flanges and the bar are separable. 3. The coaxial angle torque detection device according to claim 1 or 2, wherein the rotating shaft to be measured is a shift lever shaft of an automatic transmission transmission connected to an internal combustion engine. .