DE2157245A1 - Throttle valve for carburettors of internal combustion engines - Google Patents

Description

Patent application Throttle valve for carburettors of internal combustion engines

The invention relates to a throttle valve for carburetors of internal combustion engines, containing a metal plate which is in a pivot axis about a Carburetor is pivoted.

In the case of register carburetors for internal combustion engines in particular, it is necessary to seal the carburetor part that is not required in the lower operating range to ensure that no undesirable amounts of air get into the intake system.

Known throttle valves have the disadvantage that they can only be manufactured so precisely with great manufacturing effort that they close accordingly tightly, I also repeatedly run the risk of the throttle valve entering the channel in which it is arranged to get stuck.

The aim of the invention is to propose a throttle valve with less Manufacturing effort allows a greater sealing of the channels in which it is arranged.

US 196 / November 35, 1971

209824/0648

Record of the company: Cologne · Cologne Register Court, HRB 84 · Chairman of the Supervisory Board: Max Ueber ■ Board of Directors: John A. Banning, Chairman Dr. Klaus B. Amedlck ■ Han ^ Adolf Barthelmeh · Waldemar Ebers · Wilhelm Inden · Alfred Langer · Hans Sohaberger Deputy: Horst Bergemann · Hans-Joachim Lehmann

This goal is achieved by placing on the metal plate of the throttle valve a ring element made of flexible material is arranged, the ring element at least partially protrudes from the metal plate.

In an embodiment of the invention, the ring element can be arranged on the metal plate by means of fastening devices, the bores in the ring element being larger in diameter than the shafts of the fastening devices.

It is also advantageous if the sections of the metal plate that are attached to the channel, which is to be sealed, abut, are elliptical. Furthermore, the The outer contour of the ring element should be designed eULptically. This is the shape of the The fact that the butterfly valve is usually not perpendicular to the wall of the channel in which it is located.

The invention is explained in more detail using one shown in the figures Exemplary embodiment.

Show it:

Figure 1 is a longitudinal section through a carburetor incorporating the invention. FIG. 2 shows a section along the line 2-2 of the arrangement according to FIG.

FIG. 1 shows a section through a modern register carburetor. The carburetor contains a housing 11 in which a primary inlet duct 12 and a secondary inlet duct 15 are arranged. A main venturi tube is denoted by 14 and an auxiliary venturi tube is denoted by 16. A main venturi tube 17 and an auxiliary venturi tube 18 are arranged in the secondary inlet channel 13 in the same way. An air flap 19 is arranged in front of a primary throttle valve, as seen in the direction of flow. An "air valve" 19 is arranged in front of a primary-droasal valve when viewed in the direction of the flow. In the same way, there is “in the secondary drop valve 22 in the secondary inlet duct 13. The air terminating in the air is supplied through nozzles with fuel from a fuel caawr 2k .

US-196/3 November 1971 - 3 -

209824/0648

During normal operation, i.e. when the internal combustion engine is warmed up if the air flap 19 is in the open position, air can flow unthrottled from the intake silencer (not shown) into the inlet duct pour in. The position of the primary throttle valve 21 partly indicates which air flow can flow through the primary inlet duct and which air flow can flow through the secondary inlet duct. While through the primary intake port in all Operating states of the internal combustion engine, air flows in, there is an inflow of air through the secondary inlet duct only under certain operating conditions instead of. Accordingly, the secondary throttle valve 22 only opens when a particularly large amount of power is required. This is the case, for example, when is to be accelerated or when a high torque is to be delivered. During the other-η operating states, the secondary throttle valve remains closed, it is of particular importance in these operating states that the secondary inlet channel 13 is actually completely sealed off. In particular when the internal combustion engine is idling, it is it is highly desirable that the secondary intake passage 13 should not have an air-fuel mixture can get into the engine. This is necessary in particular because it is the only way to ensure that the internal combustion engine with your exhaust gases remains within the set tolerances.

The secondary throttle valve 22 consists of a metal plate 26 with a Pivot axis? 7 is connected. The pivot axis 27 is pivotable in the lower Area of the secondary inlet channel 13 is arranged. The metal plate 26 is slightly elliptical and contains two protruding portions 28 and 29, the in the closed position of the throttle valve on the wall of the secondary inlet duct 13, which is circular in cross section, abut. The sections 31 and 32 of the metal plate are also designed elliptically, namely in the Way that they are equidistant from the wall of the secondary intake port when the throttle is closed.

US-196 / November 3, 1971 - 4 -

209824 / 0ΒΛ8

A ring element 33 is arranged on the metal plate 26 in such a way that the ring element 33 projects beyond the metal plate 26. The ring element is attached to the metal plate in front of the metal plate, viewed in the direction of flow. The fastening is carried out by a plurality of fastening devices 34. The diameter of the bore 36 on the flexible ring element 33 is kept larger than the shaft of the fastening elements, with the result that the ring element can move somewhat in all directions in the plane of the metal plate; This arrangement is chosen so that the ring member 13 to adjust the ^Contour of the secondary inlet channel during closing of the secondary throttle valve 22, and can thus achieve a better seal.

The ring element 33, like the metal plate 26, is kept slightly elliptical, so that a tight application of the ring element to the inner wall of the secondary inlet channel 13 can be done. Even if the sealing edges wear and tear, a tight fit is achieved. The arrangement is also there made so that the pressure difference on both sides of the secondary throttle valve the ring element and not the metal plate 26 presses against the wall of the secondary inlet channel 13 in a sealing manner.

The arrangement according to the invention thus proposes a throttle valve, which provides an improved seal with little construction effort and manufacturing effort an inlet port of a carburetor allowed.

US 196 / November 3, 1971

209824/0648

Claims (4)

Claims Throttle valve for carburetors of internal combustion engines, containing a Metal plate which is pivotably mounted about a pivot axis in a carburetor, characterized in that on the metal plate (26) the Throttle valve a ring element (33) made of flexible material is arranged, wherein the ring element (33) at least partially over the metal plate (26) stands out. 2. Throttle valve! According to claim 1, characterized in that the ring element (33) by means of fastening devices (34) on the metal plate (26) - Is ordered, wherein the bore (36) in the ring element (33) are larger in diameter than the shafts of the fastening devices 3. Throttle valves according to claim 1 and 2, characterized in that the sections (28, 29 »31, 32) of the metal plate are elliptical. 4. Throttle valve according to claim 1 bia 3, characterized in that the outer contours of the ring element (33) are elliptical. üs-196 / November 3, 1971 2 0 9 8 2 "A / 0 6 4 8 ORIQiNAL INSPECTED Emptiness