Throttle device

Details Throttle device Throttle device

1996-03-04

1997-09-23

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Specific throttle valve structure

251306, 264255, 425588, F02D 910, F16K 122

Patent

active

056693508

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a throttle device, and more particularly to a throttle butterfly in an intake channel of an internal-combustion engine.
A throttle butterfly is known, for example, from European Patent Document EP 0 498 933 A1. This throttle butterfly is integrated into a housing which may be fastened to a carrying body. The housing is constructed in the manner of a throttle butterfly stub pipe; that is, the stub pipe is, on the one side, fastened to the carrying body and, on the other side, to the intake system of an internal-combustion engine.
A disadvantage of this throttle butterfly fastening is the fact that a larger number of structural elements is required as well as a larger number of sealing elements between the individual components.
Furthermore, from International Patent Document WO 91 05 152, a throttle device is known for reducing the charge cycle losses in the case of an internal-combustion engine. This throttle device is also a separate component which, on the one side, must be connected to the intake system of an engine and, on the other side, must be connected to an air-carrying system.
In the course of the required reduction of components for the purpose of saving cost, of optimization and of reducing weight in vehicle and automobile manufacturing, the endeavor to produce complete systems which implement this goal is recognized.
It is therefore an object of the invention to provide a throttle device which can be produced in a cost-saving manner and can also be integrated into modern intake systems.
It is an important advantage of the invention that the consequent use of synthetic material in the area of the intake system of an internal-combustion engine is largely taken into account.
Structures made of synthetic materials require special constructions. Problems, such as vibrations and warping, anisotropy, conditioning states and others, must be taken into account constructively.
In addition, synthetic material has other interesting features, such as resistance to corrosion, high mechanical damping, an extremely low coefficient of friction, low wear, a low specific weight, good machinability and low finished-part costs in the case of mass productions. Particularly, the latter suitability of the synthetic materials for a finishing at reasonable cost, which is particularly striking during the injection molding of parts having a complicated design, makes synthetic materials superior to other materials.
Known throttle butterfly or throttle devices were normally made of metal, preferably of aluminum and were arranged between a synthetic air filter and a synthetic intake pile. By means of the integration of the throttle butterfly into one of these two systems and by means of the consequent application of synthetic material, a considerable weight and cost reduction is achieved.
According to an advantageous embodiment of the invention, it is provided to apply an elastomer to the sealing surface on the throttle butterfly side. This elastomer may be may be integrated in the throttle butterfly. A known manufacturing process for this purpose is the two-component injection molding process in which the throttle butterfly made of the synthetic material is produced first and, in a second operation, within the same mold, the elastomer seal is injected into an opening channel. However, it is also possible to mount the molded elastomer parts subsequently. This type of sealing takes into account the synthetic-material-specific circumstances and considerably reduces the leakage air rates.
Another advantageous embodiment of the invention is the bipartition of the throttle butterfly shaft. Two-part throttle butterfly shafts can be mounted particularly easily and have the advantage that each shaft portion can be equipped with specific components, such as sensors or control elements and, during a mounting, only these two preassembled elements must be adapted to the housing.
The advantage of this idea is mainly the increased flexibility of different regulating and control elements and the service-friendly c

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patent: 4176823 (1979-12-01), Gliatas
patent: 4344396 (1982-08-01), Yamada
patent: 4411405 (1983-10-01), Barbe
patent: 4776313 (1988-10-01), Freismuth et al.
patent: 5035214 (1991-07-01), Daly et al.
patent: 5181492 (1993-01-01), Sausner et al.

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