Rotary actuator

Details Rotary actuator Rotary actuator

1992-09-08

1994-01-04

Rosenthal, Arnold

Valves and valve actuation

With selective flow regulation

Rotary

251209, F16K 510, F02M 307

Patent

active

052753735

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a rotary actuator. More particularly, it relates to a rotary actuator for controlling a throttle cross-section in an operating fluid carrying line of an internal combustion engine, with a housing and an actuating motor which drives a rotary valve acting on a throttling organ.
Rotary actuators of the above mentioned general type are known in the art. From the DE-GM 88 90 3181, such a rotary actuator is already known, which due to the forming of vortexes can however cause whistling noises, and its control behavior can be influenced by pulses of air turbulence occurring on its rotary valve.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a rotary actuator of the above mentioned type, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a rotary actuator in which the rotary valve has a control edge and opposite this, a rear edge both of which extend obliquely relative to an axis of a shaft of the rotary valve.
When the rotary actuator is designed in accordance with the present invention, it has the advantage that on flowing through the disc valve, disturbing noises are avoided and air turbulences do not occur. Moreover, the air turbulences reduce to a small amount of the size of bearing friction.
It is of particular advantage that the throttle opening, which is configured as an oblique window, has limits which extend obliquely in relation to the shaft axis. Due to both the output and the input connection piece being arranged at the side of the rotary actuator shaft, in particular such that the flow is guided approximately tangentially past the rotary disc valve shaft, the formation of vortexes in the valve housing is reduced, which has the additional effect of reducing noise.
In accordance with another embodiment of the present invention, the rotary actuator has limiting edges of the throttle aperture which are allocated at the edges of the rotary valve and extend obliquely relative to the axis of the shaft of the rotary valve.
Still another feature of the rotary actuator is that the axis of an input connection piece which is arranged on the rotary valve housing also moves laterally past the shaft of the rotary valve.
In accordance with another feature of the present invention the throttle aperture can have the shape of a parallelogram or a rectangle.
Finally, the rotary valve can be adjusted from its rear position in either direction of rotation.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a longitudinal section through a rotary actuator,
FIG. 2 shows a view of the input connection piece of the rotary actuator,
FIG. 3 shows a section in accordance with line III--III in FIG. 1, and
FIG. 4 shows a rotary actuator in perspective.


DESCRIPTION OF THE PREFERRED EMBODIMENT

A rotary actuator 1 for regulating the idle combustion air of an internal combustion engine has a rotary valve housing 2 with housing cap 3, within which an actuating motor 4 is accommodated. The actuating motor 4 has a rotor 5 acting on a rotary valve which serves as a throttle. The rotary valve 6 is connected to the rotor 5 via a shaft 7 which is supported in two anti-friction bearings 8, 9. The rotary valve 6 rests in a bore 11 which is arranged parallel with the shaft 7 in the housing 2. In the region of the rotary valve 6, the housing 2 has at its side a throttle aperture 12 which terminates in the bore 11 and which is connected to an input connection piece 13 for the purpose of conne

REFERENCES:
patent: 2449833 (1948-09-01), Barnes
patent: 4934604 (1990-06-01), Oskamp
patent: 4962737 (1990-10-01), Brand et al.
patent: 4989833 (1991-02-01), Polon

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