Valves and valve actuation – Electrically actuated valve – Rotary electric actuator
Patent
1992-07-21
1993-08-03
Rosenthal, Arnold
Valves and valve actuation
Electrically actuated valve
Rotary electric actuator
25112912, F16K 3104
Patent
active
052321975
DESCRIPTION:
BRIEF SUMMARY
STATE OF TECHNOLOGY
The invention is based on a control device for regulating the opening of a cross sectional area of a flow line, in particular for internal combustion engines.
In a known control device of this type (DE 32 00 096 A1), the two-part drive housing comprises a hollow cylinder which is pushed onto and fixed to the stub, and a cap which closes off the hollow cylinder on the front face, this cap being equipped with a plug which is connected to the armature winding. The stator held on the hollow cylinder has two permanent magnet poles, whilst the rotor carries the armature winding in axial grooves. The armature comprises two windings set at 90.degree. to each other and acting in opposite directions, with these windings being connected with the plug via slip rings. The rotor, together with the rotary valve, is fitted torsionally rigid on a bearing sleeve which is supported via two radial bearings located at an axial distance from one another on the rotor axis, which in turn is held in the two locating apertures of the boss formed on the actuator housing on the one side, and on the cap of the drive housing on the other side. The control part of the rotary valve, which projects into the setting chamber of the actuator housing and there acts in conjunction with the setting window, and which has an arc-shaped cross section, is located coaxially to the rotor axis.
The known control device comprises a total of three subassemblies which are manufactured separately and which permit simple final assembly; namely the actuator housing with an actuator chamber and boss, the bearing sleeve onto which are fixed the rotor with the rotor winding, rotary valve and slip rings, and the drive housing with stator, connector plug and boss. However, in the manufacture and pre-assembly of the three sub-assemblies, attention must be paid to adherence to close tolerance, so that after the control device has been assembled, there is sufficient play between the rotary valve and the setting window.
ADVANTAGES OF THE INVENTION
By contrast, the control device in accordance with this invention, has an advantage that it is possible to optionally set the air gap at the setting window, in a simple manner. The thickness of the spacing disc between the front faces of the bosses on the actuator housing and the fixing part of the rotary valve, which is connected torsionally rigid to the rotor, is of decisive importance for the air gap size. Close tolerance limits in manufacture are thus no longer necessary.
In this way the precondition is at the same time provided for combining the control device; which comprises three functional units, namely the actuator housing, the rotor with the rotary valve, and the drive housing with the stator; with one another in a type of a module system, and for example, using modified functional units adapted to the respective technical requirements, such as an actuator housing with flow channel which is elongated, angled-off, or rotated about 180.degree., or actuating drives of different designs. The required clearance between the rotary valve and setting window is ensured in each case by appropriately selecting the thickness of the spacing disk.
After setting the axial clearance of the rotor with an appropriate spacing disk between the front faces of the rotor at one end and of the coaxial boss formed on the drive housing at the other end, the drive housing is connected inseparably with the actuator housing at the stub.
In a preferred embodiment of the invention, the rotor and the fixing part of the rotary valve is held, torsionally rigid, on a rotor shaft which is carried in radial bearings, which in turn are located in the locating apertures of the bosses formed on the actuator housing and drive housing.
In a further embodiment of the invention, the rotor is fixed on a bearing sleeve, which is of one piece with the fixing part of the rotary valve. The bearing sleeve is supported on an axis via two radial bearings located at an axial distance, with this axis being held in the two locating apertures
REFERENCES:
patent: 4494517 (1985-01-01), Kratt et al.
patent: 4895344 (1990-01-01), Brand et al.
Franz Manfred
Gerhard Albert
Hammer Uwe
Kalippke Harald
Meiwes Johannes
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Rosenthal Arnold
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