Internal-combustion engines – Engine speed regulator – Specific throttle valve structure
Patent
1991-03-22
1992-03-03
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Specific throttle valve structure
123399, 251305, F02D 1110, F02D 908, F16K 122
Patent
active
050922963
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on an apparatus, in particular for a vehicle, having a throttle device determining a power of a prime mover.
There are various possible ways of preventing a rotatable throttle device from executing a highly undesirable displacement in the direction parallel to its axis of rotation.
For example, a spring may be provided, which is located between a housing which the throttle device and acts axially upon the throttle device, seeking to act on a shoulder of the throttle device counter to a shoulder on the housing. However, that has the disadvantage of requiring an additional spring, and of additional friction that is created between this spring and the rotatable throttle device.
It is also known to provide a plunge cut on the shaft on which the throttle device is supported and to secure a strap to the throttle device housing that engages this plunge cut and thus secures the throttle device shaft against axial displacement. However, that has the disadvantage that if clamps are to be avoided, the shaft cannot be secured in a play-free manner. This is especially disadvantageous since an increased air leakage gap must be provided between the throttle valve and the throttle device housing to match this axial play. Furthermore, if a potentiometer is actuated via the throttle valve shaft, there is a disadvantageous effect on the service life and operational reliability of this potentiometer. For the operating behavior of the apparatus, a decisive factor is to provide the smallest possible air leakage gap between the throttle valve and the throttle device housing.
ADVANTAGES OF THE INVENTION
The apparatus according to the invention has the advantage in particular that the location of the throttle device relative to the throttle device housing in the direction parallel to its axis of rotation is defined exactly and in particular without play. No separate component whatever is required for exact definition of the location of the throttle device in the direction of the axis of rotation. An air leakage gap between the throttle device and the throttle device housing can be kept quite small by an advantageous close selection of tolerances.
Often, the rotational position of the throttle device is measured with the aid of a potentiometer. The axially play-free support has a positive effect on the functional reliability and service life of this potentiometer as well.
Advantageous further features of and improvements to the apparatus disclosed are attainable with the provisions recited in the dependent claims.
Particularly with the proposed disposition of the drive wheel, magnet and armature, a simple, sturdy, small-sized, long-lived, functionally safe and reliable kind of structure is attained.
If the apparatus is embodied such that, if the magnetic force that is for instance provided upon failure of a servomotor should itself fail, coupling of the throttle device to an emergency actuation apparatus is effected, then further operation of the apparatus is assured even if electrical components fail.
DRAWING
Exemplary embodiments of the invention are shown in simplified form in the drawing and described in further detail in the ensuing description.
FIGS. 1 and 2 each show one exemplary embodiment.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
The structure and mode of operation of an apparatus having a throttle device, embodied according to the invention, will now be described in further detail in terms of an exemplary embodiment, in conjunction with the drawing.
The apparatus according to the invention can be used to control the output of the prime mover, although not solely limited to this, it is assumed in the description of the exemplary embodiment, for the sake of simplicity, that the apparatus according to the invention is installed in a vehicle having an Otto engine as its prime mover and having a throttle valve as the throttle device. However, the apparatus according to the invention can also be used in machines mounted in stationary fashion as well as if the prime m
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patent: 4561158 (1985-12-01), Johnson et al.
patent: 4938452 (1990-07-01), Imamura et al.
patent: 5002032 (1991-03-01), Kolberg
patent: 5005545 (1991-04-01), Wendel et al.
patent: 5027766 (1991-07-01), Zentgraf et al.
patent: 5035214 (1991-07-01), Daly et al.
Detlev Zieger
Gross Walter
Gunter Spiegel
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Wolfe Willis R.
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