Torque transmitter

Details Torque transmitter Torque transmitter

1999-05-24

2001-07-17

Noori, Max (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

Reexamination Certificate

active

06260421

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a method and a device for mounting a torque sensor in engines.
BACKGROUND OF THE INVENTION
It has been long known how a torque sensor may be designed in order to measure torsional moments on shafts in engines, for instance in vehicles. The torque sensor may provide a contactless measurement by means of, for instance, utilizing a transductor of a magneto-elastic type which is symmetrically shaped around a shaft, i.e. an inductive measurement. Other ways of measuring torsional moments may, for instance, be through strain sensors (for instance through trailing contacts and telemetry, i.e. resistively, capacitive measurement, optical measurement, transformer technique (transfer from primary to secondary winding), telemetry or a torductor (measure the change in the magnetic properties of a shaft).
One way of measuring torque on a shaft by using a torque sensor of a magneto-elastic type which is symmetrically designed around the shaft is previously known from U.S. Pat. No. 4,873,874. The torque sensor is furnished with three stationary coils, connected in series, in order to magnetize the shaft, and three further coils in order to detect the transferred torque in the shaft. Furthermore, the shaft is provided with three parallel, annular zones, designed in such a way that the magnetic field in the shaft may be deflected by at least 45° in order to obtain good sensitivity of the torque sensor. An advantage with this torque sensor is that it reduces the sensitivity to temperature gradients in a reliable way.
Certain problems may, however, occur when mounting a sensor according to the solution in U.S. Pat. No. 4,873,874, since the mounting requires high precision and is thus work intensive. Furthermore, unnecessary wear of the zones occurs should the shaft not be sufficiently centered in relation to the coils.
SUMMARY OF THE INVENTION
Consequently, it is an object of the present invention to provide a device and a method for increasing the accuracy, the service life, the reliability, for obtaining a better centering and less play between the different components of the torque sensor and when mounting a torque sensor in engines and driving transmissions in general.
Another object is to obtain better accessibility and easier mounting of a torque sensor in engines.
In accordance with the present invention, these above-mentioned objects are achieved by means of providing a method and method in accordance with.
Preferred embodiments of the method and the device, in accordance with the invention, are disclosed in further detail herein.


REFERENCES:
patent: 3740999 (1973-06-01), Whitehouse
patent: 4712433 (1987-12-01), Hochstein et al.
patent: 4873874 (1989-10-01), Sobel
patent: 4885944 (1989-12-01), Yagi et al.
patent: 4887461 (1989-12-01), Sugimoto et al.
patent: 5115685 (1992-05-01), Jorgensen et al.
patent: 5375476 (1994-12-01), Gray
patent: 0 556 734 A2 (1993-08-01), None
patent: 452 509 (1987-11-01), None
patent: 95/27191 A1 (1995-10-01), None
patent: 95/35487 A1 (1995-12-01), None

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