Throttle device

Details Throttle device Throttle device

1996-05-29

1997-04-08

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Specific throttle valve structure

F02D 908

Patent

active

056178255

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a throttle device according to the preamble of the main claim.
A throttle valve is known, for example, from European Patent Document EP 04 98 933 A1. It is integrated into a housing which can be fastened on a supporting body. The housing is constructed in the manner of a throttle valve connection piece; that is, the connection piece is fastened on one side to the supporting body and on the other side to the suction system of an internal-combustion engine.
A disadvantage of this throttle valve fastening is the fact that high component expenditures are required, and a larger number of sealing elements is necessary 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 one side, must be connected to the suction system of an engine and, on the other side, must be connected to an air-carrying system.
A disadvantage of this known device are the high mounting expenditures as well as the large number of component parts which must be joined to form a unit when the throttle device is assembled. In contrast, in the course of the continuing reduction of components and of the optimization as well as the weight reduction in vehicle and automobile construction, there is the endeavor to produce complete systems which achieve this objective.
It is therefore an object of the invention to provide a throttle device which requires lower mounting expenditures and simplifies the servicing of the system. Based on the preamble of the main claim, this object is achieved by means of its characterizing features.
A significant advantage of the invention is the fact that the consequent use of plastic material in the area of the suction system of an internal-combustion engine is largely taken into account. Because of the lower modulus of elasticity, specifically plastic material partially causes much lower specific stress to the material as a result of the support surface considerably enlarged by deformation than in the case of steel pairings. In addition, synthetic material has further interesting features, such as resistance to corrosion, high mechanical damping, an extremely low friction coefficient, lower wear, a low specific weight, good processing capacities and low finished part costs in the case of mass production. Particularly the latter suitability of the plastic materials for a finishing at reasonable cost which is particularly striking during the injection molding of parts of a complicated design, makes the plastic materials superior to other materials.
Known throttle valves or throttle devices were normally constructed of metal and arranged between a plastic air filter and a plastic suction system. By means of the modular construction of the throttle valve, the assembling expenditures can be reduced considerably. In addition, the modular design permits an easy exchange of defective parts and a componentized manufacturing in the case of which, starting from a basic module, different components, according to the demand, can be combined with one another to form a throttle device.
An advantageous embodiment of the invention provides that the throttle valve be equipped with a shaft divided into two parts. This has the advantage of, in addition to facilitating the assembly, making it possible for two separate modules to be present on the shaft parts. This provides that the position sensor is arranged on one shaft portion and the adjusting unit is arranged on the other shaft portion.
A further embodiment of the invention provides that the throttle valve module is to be slid as a complete unit into an existing connection piece or is to be connected between two connection pieces. Thus, an additional throttle valve connection piece is avoided.
According to another embodiment of the invention, it is expedient to integrate the housing of the throttle valve module into a connection. This means that the co

REFERENCES:
patent: 4064857 (1977-12-01), William
patent: 5035214 (1991-07-01), Daly et al.
patent: 5158045 (1992-10-01), Arthur et al.
patent: 5188078 (1993-02-01), Tamaki
patent: 5216992 (1993-06-01), Ropertz et al.
patent: 5374031 (1994-12-01), Semence et al.

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