Measuring and testing – Dynamometers – Responsive to torque
Patent
1990-04-12
1991-07-02
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
G01L 310
Patent
active
050276638
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a measuring device. A known measuring device has two bodies comprising electrically conducting, nonmagnetic work material and arranged coaxially relative to a shaft, both of which bodies are connected with the shaft for joint rotation herewith and are rotatable relative to one another. In addition, a coil is provided which is coaxial relative to the shaft and is arranged in the immediate vicinity of the two bodies with high-frequency alternating current flowing through this coil. These bodies comprise cut-out portions whose mutual overlapping surface changes as the angle of rotation occurring between the two bodies increases, wherein the relative rotation of the two bodies can be determined for the purpose of measuring the change in impedance of the coil which is caused by eddy currents induced in the bodies. A torque rod is arranged in the axial direction of the shaft in order to produce this relative rotation, so that the measuring device is relatively long (DE-PS 29 51 148).
SUMMARY OF THE INVENTION
The object of the invention is a measuring device that is relatively short and can be used under relatively cramped installation conditions, that accurately determines the driving or driven moment (torque), and has a relatively simple and compact construction.
The object of the invention is achieved by providing a device in which a torsion element comprises at least one radially extending bending rod, a first measurement element is connected with a rigid part of the torsion element, and a second measurement element is connected with a body movable as a function of bending of the rod. The bending rods can be protected from unacceptably high torques by stops, so that an overload protection is achieved.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiment with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal cross-sectional view of a torque sensor according to the invention;
FIG. 2 shows a a view in direction II--II;
FIG. 3 shows a top view of a slotted disk of the torque sensor;
FIGS. 3a and 3b, respectively, show modifications of the slotted disk; and
FIG. 4 shows a view of the torsion element in a basic position and in a torqued state.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A shaft is designated by 10 in FIG. 1 and comprises a flange 11 at one end and projects through a bore hole 12 of a housing 13 at the other end. Two slotted disks 14, 15 are arranged between the flange 11 and the housing 13 so as to be concentric relative to the shaft 10. A flat coil 16 is fastened at the housing 13 so as to face the front sides of the slotted disks 14, 15. Another coil shape can also be considered instead of a flat coil 16, wherein, however, the flat coil 16 is particularly compact and economical with respect to space. In addition, a recess 17 which is open toward the slotted disks 14, 15 is formed in the housing 13, sensor electronics 18 for evaluating the measurement signals tapped at the flat coil 16 being arranged in the recess 17. The slotted disks 14, 15 are produced from electrically conducting, nonmagnetic material or are coated with a layer of this material. A sliding intermediate layer 19 and 20, respectively, is located between the two slotted disks 14, 15 and between the slotted disk 15 and the flat coil 16.
The flange 11 is constructed as a spoke wheel. It comprises an outer rim 23 which is rigidly connected with the slotted disk 14 via a connection part 24. In addition, a plurality of continuous bore holes 25, by means of which e.g. an electric motor, not shown, can be flanged on, are formed in the rim 23 so as to be spaced by approximately 90.degree. relative to one another. Accordingly, a driving torque can be introduced on the rim 23. Only every first spoke 26 of the spoke wheel is securely connected with the hub 27 a
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patent: 2173039 (1939-09-01), Muir
patent: 2403952 (1946-07-01), Ruge
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patent: 3728896 (1973-04-01), Sheldon et al.
patent: 4135390 (1979-01-01), Templin
patent: 4356732 (1982-11-01), Hachtel et al.
patent: 4805463 (1989-02-01), Kelledes et al.
Frister Frank
Pfeffer Peter
Robert & Bosch GmbH
Ruehl Charles A.
Striker Michael J.
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