Electricity: measuring and testing – Magnetic – Displacement
Patent
1985-02-22
1987-02-24
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
7386234, 34087031, G01L 310, G01B 730
Patent
active
046460101
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a transmitter arrangement for a rotatable shaft comprising a rotor in the form of a cog-wheel device which is to be mounted on the shaft and a stator which is rigid relative to the rotatable shaft and is adapted for connection to an AC voltage to generate electrical signals which depend on the angular position of the rotor relative to the stator.
BACKGROUND OF THE INVENTION
An arrangement of this kind is disclosed in for instance U.S. Pat. No. 3,505,865 and relates to a device for measuring angular differences between two toothed wheels which are mounted on a rotatable shaft. Such an arrangement comprises two inductive transmitters, each of which cooperates with a toothed wheel to generate electrical signals which depend on the angular position in space of the toothed cog-wheel. A differentiating device is connected to the two transmitters and is adapted to measure the difference between two signals generated by the transmitter. The measuring technique which is accomplished through the system according to the just mentioned U.S. specification is consequently utilized in the transmitter arrangement according to the present invention.
In the system according to the above patent, the two wheels are massive and are mounted on the shaft by means of supporting rings which have to be carefully centered and fixed directly on the shaft by means of jaws. Such an installation is rather complicated and time-consuming, which has caused problems specifically if the installation has to be carried out on a ship's propeller shaft during the short time period when the ship is staying in harbour for loading or unloading of cargo. Consequently, demands have been made for an improved installation of the toothed wheels which can be carried out more rapidly and which does not unnecessarily prolong the ship's stay in harbour.
OBJECT OF THE INVENTION
The object of the present invention is to provide a transmitter arrangement for a rotatable shaft which has low weight and enables easy mounting and centering on the shaft and consequently can be installed in a very short time.
SUMMARY OF THE INVENTION
A transmitter arrangement according to the invention is substantially characterized in that the cog-wheel device comprises a folded cog band of magnetic material which is attached to a carrying band provided with means for assembling the cog band device around the shaft. The carrying band is provided with radially extending guide members on the surface facing the shaft, and the guide members are arranged for axial guidance of a hose to be filled with a fluid. The hose is insertable between the guide members. When the hose is filled with the fluid, the hose expands both around the periphery of the shaft and against the carrying band to fix and centre the cog band device on the shaft.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of a transmitter arrangement according to the invention to measure angular differences between two cog wheels.
FIG. 2 is a perspective view of details in a cog-wheel device according to the invention.
FIG. 3 is a side view of the ends of a carrying band according to the invention.
FIG. 4 is a plan view from below of the ends of a carrying band according to the invention.
FIGS. 5-7 show different steps in mounting the cog-wheel device according to the invention on a shaft.
DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENT
A transmitter arrangement according to the invention can be used for measuring torque on a rotatable shaft 1. The arrangement comprises a rotor which, according to FIG. 1, comprises two toothed wheels in the form of cog-bands 2 and 3 which are mounted on the rotatable shaft 1. Two stators 4 and 5 are rigid relative to the rotatable shaft 1 and are adapted for connection to an AC voltage source for generating electrical signals which depend on the angular position of each cog-band 2, 3 relative
REFERENCES:
patent: 3243692 (1966-03-01), Heissmeier et al.
patent: 3505865 (1970-04-01), Kihlberg et al.
patent: 3783248 (1974-01-01), Sugden
patent: 4083423 (1978-04-01), Williams et al.
patent: 4107601 (1978-08-01), Barmeier et al.
Bystrom Karl
Karlsson Erik
Kihlberg Gunnar
Reit Henry
Jungner Marine AB
Strecker Gerard R.
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