Internal-combustion engines – Engine speed regulator – Specific throttle valve structure
Patent
1996-03-07
1997-05-27
Nelli, Raymond A.
Internal-combustion engines
Engine speed regulator
Specific throttle valve structure
F02D 908
Patent
active
056322453
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is directed to an actuating device for a throttling member of an internal combustion engine. A disclosure has already been made (German Offenlegungsschrift 4,133,858, U.S. Pat. No. 5,216,992) of an actuating device in which, for the control of a throttling member, for example a throttle butterfly of an internal combustion engine, an adjusting shaft is connected in torsionally rigid fashion to an actuating member. The actuating member is in the form of a cable pulley made of plastic to enable a Bowden cable, for example, to be guided and held on the circumference of the cable pulley. To fix the cable pulley, it is pushed onto a free end of the adjusting shaft by means of a U-shaped fixing strap. The fixing strap is provided in order to make the plastic cable pulley more robust, thus enabling torque transmission. To enable the cable pulley to be connected in torsionally rigid fashion to the adjusting shaft, the adjusting shaft has two opposite flaps on the end of the adjusting shaft to receive the fixing strap plug-in fashion in a through opening shaped to match the shape of the end of the adjusting shaft, an external thread being cut between both flaps to enable the fixing strap to be held axially by means of a fastening nut.
The design of the actuating member as a separate component which can be pushed on gives rise to a considerable outlay on assembly, particularly when the actuating device is mass-produced, since it is necessary successively to mount individual components in the following sequence: actuating member, washer and fastening nut. In particular, the production of the plastic cable pulley with the fixing strap held in it and the formation of the end of the adjusting shaft with flaps and a thread necessitates a relatively high outlay on manufacture, resulting in high production costs.
ADVANTAGES OF THE INVENTION
In contrast, the actuating device according to the invention for a throttling member has the advantage that the actuating device can be produced in a simple manner, the outlay on assembly and the production costs being lowered, in particular, by the elimination of the screwed joint required by the prior art.
Advantageous developments of and improvements to the actuating device are possible by virtue of the measures presented hereinafter.
It is advantageous that an actuating member of the actuating device is simple to produce in various forms, for example in the form of a cable pulley or with a holding stud.
DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are illustrated in simplified form in the drawing and explained in greater detail in the description which follows. FIG. 1 shows a section of a first exemplary embodiment of an actuating device according to the invention, FIG. 2 shows a section along the line II--II in FIG. 1, FIG. 3 shows a section of a second exemplary embodiment of the actuating device according to the invention in a partial view and FIG. 4 shows a section along the line IV--IV in FIG. 3 of the second exemplary embodiment.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
FIG. 1 shows, in sectional representation, an actuating device I designed in accordance with the invention, which is provided with an adjusting shaft 4 and is used to control a throttling member which is, for example, in the form of a circular throttle butterfly 2. The throttle butterfly 2 is part of a throttling device of a mixture-compressing, spark-ignition or air-compressing, self-ignition internal combustion engine and is connected in torsionally rigid fashion to the adjusting shaft 4, which is, for example, of cylindrical design and is mounted at both ends, for example, in a throttle body 3. The throttle valve 2 controls the quantity of air flowing into an intake conduit 20 of the throttle body 3 approximately parallel to a longitudinal axis 7, or an inflowing fuel-air mixture, to a greater or lesser extent. For the torsionally rigid connection of the throttle valve 2, the adjusting shaft 4 is, for example, provided with an elongated recess correspond
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Greigg Edwin E.
Greigg Ronald E.
Nelli Raymond A.
Robert & Bosch GmbH
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