Torque transmitting device

Details Torque transmitting device Torque transmitting device

1990-07-09

1992-06-09

Diehl, Dwight

192 clutches and power-stop control

Clutches

Axially engaging

192 85AA, 192103F, F16D 382, F16D 2504

Patent

active

051199238

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a device for connecting an electric motor rotating with at least nearly constant rotational speed with a pump forming with the motor an assembly where the parts are spaced one from the other as prescribed by standards, said motor having a housing with an end face from which with a given free length projects an output stub shaft, and the pump having an end face turned towards the said end face of the motor and from which with a given free length, and essentially co-axially with the said output stub shaft, projects an input stub shaft, the adjacent free ends of the two stub shafts being separated by a gap with given axial length.
The electric motor may be connectable to a 50 or 60 Hz net, have highest speed of 3000 to 3600 r.p., and the transmitted torque should exceed 50 Newton meters, with an uppermost limit of more than 5000 Newton meters, and an average value of about 500 Newton meters, corresponding to a power of about 75 kW at 1500 r.p.m. and about 90 kW at 1800 r.p.m.
Primarily, the invention relates to assemblies in accordance with national or international standards, such as, for electric motors, IEC-standards (International Electrotechnical Commission) or ANSI/NEMA-standards (American National Standards Institute/National Electrical Manufacturers' Association), and, as to pumps, ISO-standards (International Organization for Standardization) or ANSI-standards.
The said standards define certain dimensions which are critical for the connection or interchange possibilities, such dimensions being, with respect to the stub shafts of the machines, their diameter, their free length and the free radial space (i.e. the distance from the centre line of the stub shaft to a hypotethic coaxial cylindric surface, tangential to a closest adjacent obstruction, formed by e.g. the base plate or the like of the assembly).
Normally, the motor and the pump are interconnected by means of an elastic shaft coupling to compensate for possible small deviations from a strictly coaxial position of the two stub shafts, and the pumps are mounted in the assembly in one of the two following ways.
Either are the motor and the pump mounted at such an axial distance from each other, that the said coupling, but not any bigger unit, may be received in the gap between the juxtapposed front surfaces of the two stub shafts, and the above said gap will then be of a size of a few tenths millimeters. Or, alternatively, the gap is given a size (in the order from about 100 mm) facilitating disassembly of one of the members of the assembly, and such a gap may be bridged by a "spacer"-element, which, optionally, may be designed as an elastic shaft coupling of the "spacer"-type, i.e. in principle two conventional elastic shaft couplings, mounted one on the end of each shaft portion bridging the gap.
In the present specification are in the term "elastic shaft coupling" also included such other units, as e.g. double universal joints, which have the same function.
Another solution of the disassembling problem is to bridge the gap, according e.g. to SE-C-216.789, by means of an obliquely cut end portion of an unusually long stub shaft of the pump, and which end portion may be temporarily removed, if necessary.
However, interconnection by means of one of the above mentioned arrangements does not permit control of the speed of the pump relative to that of the motor. In practice, however, the possibility of such a control, infinite and continuous, is in the pump field often highly desirable, possibly indispensible.
Devices for transmission of rotary motion or torque by means of steeplessly and continuously adjustable speed controllers have become known in different designs and operate according to various principles, e.g. so called hydrodynamic and hydromechanic slip couplings (also called viscohydraulic slip couplings).
Most of the known speed controllers comprise a stationary or fixed member, to which the non-rotating outer parts of the controller are connected, among them a means for adjustment of a desired speed cond

REFERENCES:
patent: 4187940 (1980-02-01), Ratliff et al.
patent: 4899861 (1990-02-01), Cummings, III
patent: 4997071 (1991-03-01), Villata et al.

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