Rotating actuator

Details Rotating actuator Rotating actuator

1994-04-20

1995-12-19

Nilson, Robert G.

Valves and valve actuation

Electrically actuated valve

Rotary electric actuator

251123, 251209, 251309, F16K 510

Patent

active

054762464

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a rotating actuator as defined hereinafter. A rotating actuator is already known (German Patent Disclosure DE 40 07 260 A1) International Patent WO91/14090, but in which undesirable noise can occur because of eddying, especially when intake tubes and intake tube connections of plastic are used.


ADVANTAGES OF THE INVENTION

The rotating adjuster according to the invention has the disadvantage over the prior art that irritating noise occurring when there is a flow through the rotary slide housing is counteracted by reducing the eddying.
Advantageous further developments to and improvements of the rotating actuator are advantageous to embody a boundary face, located parallel to the flow direction, and a streamlined transition with a concave and an ensuing convex region in the outlet connection piece of the rotary slide housing; as a result, the noise occurring when there is a flow through the rotary slide housing can be reduced still further.


DRAWING

An exemplary embodiment of the invention is shown in simplified fashion in the drawing and described in detail in the ensuing description. FIG. 1 shows a longitudinal section through a rotating actuator embodied according to the invention; FIG. 2 is a plan view of the inlet connection piece of the rotating actuator, and FIG. 3 is a section along the line III--III in FIG. 2.


DESCRIPTION OF THE EXEMPLARY EMBODIMENT

FIG. 1 shows a rotating actuator 1 for regulating the idling rpm of an internal combustion engine; it has a rotary slide housing 2 with a cup-shaped receiving opening 3, into which a control motor 4 that can be acted upon by an rpm-dependent control signal is inserted. An inlet connection piece 5 and an outlet connection piece 6 are formed laterally on the rotary slide housing 2 and extend into a bore 7, extending in the rotary slide housing 2 coaxially with the receiving opening 3.
The control motor 4 of the rotating actuator 1 is connected, via a shaft 9 that for instance is supported in two spaced roller bearings 10, 11, to a rotary slide 12 that is rotatably disposed concentrically in the bore 7 and assumes a rotational angle position corresponding to the control signal of the control motor 4. In the region where the inlet connection piece 5 discharges into the bore 7, the rotary slide housing 2 has a throttle opening 13, which is closed more or less by the rotary slide 12 in accordance with a rotational angle position of the control motor 4. Opposite the throttle opening 13 in the bore 7 is an outlet opening 14, which discharges into the outlet connection piece 6. The inlet and outlet connection pieces 5 and 6 communicate via connection lines 15, 16 with an intake tube 17 in such a way that they form a bypass line 18, which bypasses a throttle valve 19 disposed in the intake tube 17; with the throttle opening 13 open, the operating medium can flow in the bypass line 18 in the direction of the arrow 20 to the engine. The connection lines 15, 16 and the intake tube 17 may be made from metal and/or plastic.
The inlet connection piece 5 has a longitudinal axis 22, and the outlet connection piece 6 has a longitudinal axis 23, which are located on the same line and extend at right angles to the shaft 9. The longitudinal axis 22, 23 are laterally offset in such a way that they extend past the shaft 9 and do not intersect it (FIG. 3). For the sake of simplicity in the drawing, the inlet connection piece 5 and the outlet connection piece 6 are shown shifted into the plane of the drawing in FIG. 1.
The flow cross section of the bypass line 18, downstream of the discharge point of the connection line 15 into the inlet connection piece 5, has a slight frustoconical constriction 24. In a portion 21 of the inlet connection piece 5 located upstream of the throttle opening 13, the flow cross section is defined by flat boundary faces 25, extending parallel to the longitudinal axis 22, that enclose a quadrilateral. Between the frustoconical constriction 24 and the boundary faces 25, a steady, streamlined transition is prov

REFERENCES:
patent: 2449833 (1948-09-01), Barnes
patent: 5239961 (1993-08-01), Neidhard
patent: 5275373 (1994-01-01), Kalippke

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