Internal-combustion engines – Engine speed regulator – Specific throttle valve structure
Patent
1994-07-28
1995-11-14
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Specific throttle valve structure
251305, F02D 910
Patent
active
054656966
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a throttle appliance for an internal combustion engine and a method of manufacturing metering or apportioning walls in the throttle appliance. A throttle appliance for internal combustion engines (German Offenlegungsschrift 30 38 945, U.S. Pat. No. 4,391,247) is already known in which a throttle element is arranged in an induction duct, the throttle element moving in its rotational range relative to metering or apportioning walls of the induction duct in such a way that the air quantity flowing past and between the throttle element and the metering or apportioning walls is limited during the opening of the throttle element. Up to an opening angle of the throttle element of approximately 40.degree., the air quantity flowing past increases steadily to an extent which is only slight with an increasing opening angle, whereas at opening angles becoming greater than approximately 40.degree., a steep increase in the air flow quantity per increase in opening angle takes place because the throttle element moves out of the region of the metering or apportioning walls. The metering or apportioning walls of the induction duct have a spherical configuration around centres which are located on the periphery of a throttle butterfly shaft. Exact metering in the range of throttle element opening angle between 0.degree. and 40.degree. is not possible due to the constant radii, starting from the centres on the periphery of the throttle butterfly shaft, of the metering or apportioning walls of the induction duct. Also disadvantageous with this arrangement is the complicated machining of the metering or apportioning walls in the induction duct because the casing has to be pivoted in order to achieve a spherical shape of the metering or apportioning walls.
ADVANTAGES OF THE INVENTION
The throttle appliance, according to the invention has an advantage that extremely accurate metering of the air quantity flowing past the throttle element is achieved in the range of opening angles of, for example, 0.degree. to 40.degree. without additional complicated arrangements, for example gears, for setting desired opening angles of the throttle element. For this purpose, the induction duct has, in the region of opening angles from 0.degree. to 40.degree. of the throttle element, metering or apportioning walls whose contours are produced by a method of displacing the centres of a chip-cutting element on a previously calculated path in the induction duct. This method of manufacturing the metering or apportioning walls of the induction duct has the advantage that the metering or apportioning walls no longer have to be made spherical. On the contrary, contours of the metering or apportioning walls are achieved which depart from a spherical shape and, for example, follow as a parallel contour at a constant distance from the contour of the centres of the chip-cutting element or even become more distant, in a previously calculated manner, from the contour of the centers of the chip-cutting element by means, for example, of a continually increasing radius of rotation of the chip-cutting element. The possibilities for varying the introduction of the contours of the metering or apportioning walls of the induction duct are therefore advantageous, these possibilities permitting the creation of throttle appliances in which very accurate metering of the air flow in the induction duct takes place within each individual angular range at small opening angles of the throttle element.
In addition to the obviation of gears for improving the progression of the opening characteristic of the throttle element relative to the metering or apportioning walls, in order to achieve very accurate metering of the air flow in the induction duct, it is particularly advantageous that a simple return spring mechanism can be used for moving the throttle element in the direction of the closed position.
It is furthermore of advantage that the throttle element has an oval configuration. In a cylindrical region of the induction duct, the thro
REFERENCES:
patent: 4391247 (1983-07-01), Shioyama et al.
patent: 4474150 (1984-10-01), Foley et al.
patent: 4905647 (1990-03-01), Kizer et al.
patent: 5315975 (1994-05-01), Hattori et al.
patent: 5374031 (1994-12-01), Semence et al.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Wolfe Willis R.
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