Rotary expansible chamber devices – Combined
Patent
1998-01-02
2000-06-20
Nguyen, Hoang
Rotary expansible chamber devices
Combined
418259, F01C 1300
Patent
active
060770619
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a vane motor, comprising a casing and a vane rotor mounted in the casing, having a friction brake device which is arranged in the casing and is intended for braking, stopping and releasing the vane rotor.
Such vane motors have been known for a long time and are preferably operated with compressed air, but also with hydraulic fluid. They are used, for example, in lifting appliances. They have proved to be reliable and robust in everyday operation. In mining, for example, their use is preferred to electric motors, since no separate measures have to be taken for explosion protection.
In general, the vane motor comprises a casing and a vane rotor mounted in the casing. The vane rotor in turn comprises, in addition to a shaft, a rotor body with rotor slots in which individual vanes are mounted so as to be radially displaceable relative to the axis of the vane rotor. The vane rotor itself is arranged in the vane motor in a cylinder liner, the rotary spindle of the vane rotor being arranged eccentrically to the longitudinal center axis of the cylinder liner and being mounted in side disks. In continuous operation, the centrifugal force acting on the vanes and possibly assisted by spring elements ensures that each vane bears against the inner wall of the cylinder liner, so that only minimum leakage losses occur between the narrow running surfaces of the vanes and the inner wall of the cylinder liner. Further leakage losses are caused by gaps at the side faces of the vane rotor and between the outside diameter of the vane rotor and the inside diameter of the cylinder liner.
Furthermore, the vane motor has integrated in its casing a friction brake device, which is provided for braking, stopping and releasing the vane rotor. This friction brake device consists, for example, of a brake disk having at least one brake shoe displaceable against the end faces of the brake disk, the brake disk being arranged with the brake shoe and a cylinder allocated to the brake shoe in a separate space of the casing, and the brake disk being mounted on an extension journal of the rotor shaft.
The brake shoe itself is spring-loaded and designed in such a way that it is more or less in frictional engagement with the brake disk both when the vane motor is stopped and in the start-up phase of the vane motor. To control the braking action of the friction brake device, a further line is provided parallel to a feed passage to the vane rotor for the pressure medium and ends in the space in which the brake cylinder for easing the friction brake device is arranged. By the action of the pressure medium, which is fed to the vane rotor and passes via the additional line into the said brake cylinder, the brake shoe is displaced against the spring force in axial direction, so that the brake disk and thus also the vane rotor--depending on the operating state--are at least partly released. When the action of the pressure medium decreases, the brake shoe comes into contact with the brake disk again, with a corresponding braking action being produced, since the pressure in the said space also decreases.
On account of the complicated and varied components and the interplay between the vane rotor and the friction brake device, it is necessary to produce the individual components very precisely. The manufacturing and assembly costs of the known vane motors are therefore relatively high.
On account of the friction brake device arranged next to the vane rotor in a separate casing chamber, the vane motor itself is of very large dimensions and, since a cast casing is usually used, is also relatively heavy.
The two last-mentioned criteria make the handling of chain hoists more difficult in certain fields of application.
The object of the invention is therefore to provide a vane motor which contains markedly fewer components than the known prior art in order to thus ensure more cost-effective manufacture of such a vane motor. The aim is also to reduce the overall size and weight.
The principle for achieving the set object consists in assi
REFERENCES:
patent: 3848716 (1974-11-01), Hanning
patent: 3883119 (1975-05-01), Hansson
patent: 3960470 (1976-06-01), Kinder
patent: 4434974 (1984-03-01), Lacount
patent: 5658137 (1997-08-01), Makela
Krebs Peter
Peters Dieter
J.D. Neuhaus Hebezeuge GmbH & Co.
Nguyen Hoang
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