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Carburetor device

A carburetor, fuel tank technology, applied in carburetor, charging system, machine/engine, etc., can solve the problem of fuel feeding into the combustion chamber

Inactive Publication Date: 2004-03-03
ANDREAS STIHL AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Restarting with the choke valve closed could result in too much fuel being sent into the combustion chamber

Method used

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  • Carburetor device
  • Carburetor device
  • Carburetor device

Examples

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Embodiment Construction

[0017] figure 1 Shown is a carburetor system consisting of a diaphragm carburetor 1 in which a scavenging pump standard unit 33 is integrated. However, the scavenging pump standard assembly 33 can also be formed independently. In the diaphragm carburetor 1 there is an air duct 2 in which is arranged a rotatably mounted choke valve 20 and downstream of the choke valve 20 a throttle valve 21 . Air duct 2 has a Venturi section 45 , in particular in the region between choke valve 20 and throttle valve 21 . In the region of the throttle valve 21 , a primary idle nozzle 16 opens into the air duct 2 , and upstream of the primary idle nozzle 16 a secondary idle nozzle 17 opens into the air duct 2 . When the throttle valve 21 is closed, the primary idle nozzle 16 is located downstream of the throttle valve 21 and the secondary idle nozzle 17 is located upstream of the throttle valve 21 .

[0018] A main nozzle 30 opens into the gas channel 2 in the region of the Venturi section 45 ....

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Abstract

A carburetor arrangement for an internal combustion engine in a manually guided implement, such as a power chainsaw, a cut-off machine, etc. is provided. A regulating chamber delimited by a regulating diaphragm is provided. Upon deflection of the diaphragm due to underpressure in the regulating chamber, the latter is connected with a fuel tank. Via at least one nozzle, the regulating chamber opens into an air channel that supplies fuel / air mixture to the engine. The carburetor arrangement includes a scavenging pump that is disposed in a return line from the regulating chamber to the fuel tank, and in which is formed a pump chamber. The scavenging pump serves to completely fill the regulating chamber with fuel before start-up of the engine. To prevent the fuel / air mixture from becoming too lean after start-up, especially upon opening of the choke valve, a supply line is provided from the pump chamber into the air channel and supplies additional fuel to the air channel during the run-up phase.

Description

technical field [0001] The invention relates to a carburetor arrangement of the type stated in the preamble of claim 1 . Background technique [0002] From EP 0786 591 a diaphragm carburetor is known which comprises a scavenging pump and an injection pump as a pure starting aid. By manipulating the fuel injection pump, fuel can be injected into the intake port before starting. Thus, a sufficient supply of fuel is already obtained for the first ignition of the internal combustion engine without a choke valve. However, the amount of fuel injected is used up as the engine is started. [0003] Normally, the internal combustion engine is started with the choke valve closed. If the choke valve is opened very quickly after starting, a lean mixture can occur, especially with a cold engine. Therefore, the engine stalls. Restarting with the choke valve closed may result in too much fuel being sent into the combustion chamber. Thus, many further attempts are required in order to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M1/02F02M1/16F02M17/04
CPCY10S261/68F02M1/02F02M17/04F02M1/16
Inventor G·奥斯博格J·甘特尔特R·格尔哈迪
Owner ANDREAS STIHL AG & CO KG
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