Measuring and testing – Dynamometers – Responsive to torque
Patent
1988-09-14
1990-03-06
Myracle, Jerry W.
Measuring and testing
Dynamometers
Responsive to torque
180 791, G01L 302
Patent
active
049055240
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a measuring device for detecting a differential angle of rotation or torque of a torsionally stressed machine part. Such a known measuring device has two bodies of electrically conductive, non-magnetic work material which are arranged coaxially relative to a shaft, one of which bodies being connected with the shaft so as to be fixed for joint rotation therewith, the other body being rotatable relative to the shaft. Moreover, a coil is provided coaxially relative to the shaft and is arranged in the immediate vicinity of the two bodies, high-frequency alternating current passes through the coil. These two bodies comprise cut out portions whose mutual overlapping surface changes as the torsion angle occurring between the bodies increases, wherein the relative rotation of the two bodies can be detected for the purpose of measuring the change in impedance of the coil which occurs as a result of eddy currents induced in the bodies. This known device is relatively costly (DE-PS 29 51 148).
SUMMARY OF THE INVENTION
The object of the invention is to provide a measuring device, which allows an accurate detection of a torque differential of two torques acting jointly on an output shaft in a relatively simple design and compact manner of construction. The object of the invention is achieved by providing a machine part with two torsion spring elements arranged parallel to each other and having different spring constants and by providing a sensor located at a comparison point for detecting a differential of two input angles of rotation to thereby detect a differential of two input torques. The transmission of signals from a rotating machine part to a stationary machine part can be effected by various known transmission possibilities.
The invention as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following description of the preferred embodiments with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a simplified view of a a first embodiment measuring device according to the present invention;
FIG. 2 shows a cross-sectional view of a second embodiment of a measuring device according to the present invention;
FIG. 3 shows a side-cross-sectional view of a a third embodiment of a measuring device according to the present invention;
FIG. 3a shows a view in the direction of arrow 18 according to FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The embodiment according to FIG. 1 shows a principle of the measuring device according to the invention in its simplest construction, but in such a way that such a device would also be applicable in practice. The measuring device comprises a shaft 10, a torque M1 being introduced at the upper end of the latter. The shaft 10 comprises two neck portions 11, 12 having torsion spring constants C1 and C2. A drive gear 13, particularly a toothed gear, by which a servomotor, not shown, can deliver a torque M2 to the shaft 10, is fastened in the middle part of the shaft 10, that is between the neck portions 11 and 12. The torque M1, which is introduced at the upper end of the shaft 10, and the servo-torque M2, which is introduced via the drive gear 13, are added together. The sum M3 of these torques acts on the lower end of the shaft 10, i.e. at the output side 10A. A lever 14, which is rotatable in the middle of the shaft 10 at a point 15 and is supported in an articulated manner at the output side 10A of the shaft at a point 16, is arranged in the longitudinal direction of the shaft 10. The upper end 14A of the lever 14 projects over the center of rotation 15 until a comparison point 18 at the upper end of the lever 10, at which a sensor element 17 is located. The comparison point 18, together with the sensor element 17, serves to indicate the differential of two torques M1 and M3; in this connection, M3=M1+M2.
When a torque M1 is introduced in a clockwise direction at the upper end of the shaft 10, a d
REFERENCES:
patent: 2930247 (1960-03-01), Zinn
Dressler Klaus
Pfeffer Peter
Schwarz Albrecht
Myracle Jerry W.
Robert & Bosch GmbH
Striker Michael J.
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