DE3522812C1 - Carburetor for internal combustion engines - Google Patents

Description

tors no longer into the filter chamber and from there into the atmosphere, but into the activated carbon trap 26, where they are absorbed.

The activated charcoal trap 26 has further connections for the regeneration of the activated charcoal, but these are not are described as there is no direct connection with the invention.

Alternatively, in the exemplary embodiment, the membrane 13 is activated by an electromagnet when the motor is in operation to replace.

For this purpose 2 sheets of drawings

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Claims (3)

1 2 Adherent developments are named with the subclaims: The invention provides a fault-free hot idle I.Varburetor for internal combustion engines with an during and hot start operation with effective limitation of the Commissioning of the internal combustion engine responding 5 evaporative emission has become possible, so that the corresponding device for switching the environmental impact can be reduced. Float chamber from outside to inside ventilation An embodiment of the invention is in the device, with the internal ventilation being shown at least as a drawing and is described below two channels that are used to achieve air ben.
flow connected to intake duct sections 10 It shows are, between which a pressure F i g. 1 a carburetor in section, difference exists, characterized by Fig. 2 the carburetor in a plan view, net that these channels are connected to the intake channel F i g. 3 shows a section of FIG. 2 connected channels (8, 10) and from with the. F i g. 1 shows a carburetor 1, the intake duct 2 Channels (24, 25) 15 connected to the float chamber for air, a throttle valve 3, a venturi section 4 are formed, which in engine operation over two in one with a pre-atomizer 5 for the introduction of the ner housing bore (12) by free turns (20, fuel and an air flap 6. The An-21) a slide rod (11) formed chambers suction channel 2 is set in a section 7 of a filter (22,23) are connected, with one then continuing into the atmosphere chamber of an air filter (not shown). Of the Sphere or to an activated carbon trap (26) leading 20 carburetor 1 has other systems that are not shown channel (27) are closed by the slide rod (11). Upstream of the venturi section 4 opens is, and that when the engine is switched off with the one channel 8 in the intake channel section 9 there Suction channel connected channels (8, 10) from the one and a further channel 10 in the suction channel-off slide rod (11) closed and one of the section 7 of the filter chamber. the float chamber connected channels (24) 25 F i g. 2 shows a breakout of the carburetor 1 from the Via the cam formed by the free rotation (20), a slide rod 11 is arranged in a Gehäumer (22) with which the atmosphere or the active bore 12 can be seen. The slide rod 11 is coal trap (26) leading channel (27) are connected. connected to a membrane 13, the one in a 2. Carburetor according to claim 1, characterized marked above the fuel level a float cam, that the slide rod (11) of a 30 mer gas space 14 ventilated chamber 15 geden Separates fuel supply pressure responsive mem- ber across a cover chamber 16, wherein the brane (13) is adjusted. Lid chamber 16 via a connecting line 17 to the 3. Carburetor according to claim 1, characterized in that the fuel supply leading to the float chamber is marked, that the slide rod (11) is connected by a line 18 and with the in this Zuführlei motor operation energized electromagnet adjusted 35 device 18 pressure is applied. will. When the internal combustion engine is started up in the fuel supply line 18, a delivery pressure which the membrane 13 with the slide rod 11 from the in Fig. 3 shown first end position (turned off 40 motor) against the force of one spring 19 into a second The invention relates to a carburetor for internal combustion end position moves. In this second end position bilmaschinen according to the preamble of claim 1. the two free rotations 20,21 of the slide rod 11 in Such a carburetor is in DE-OS 25 34 685 of the housing bore 12 chambers 22, 23, in the once and has one of the fuel supply which is connected to the intake duct sections 7, 9 pressure-dependent device for switching the 45 channels 8,10 and two more, from the gas chamber 14 of the Float chamber from outside to inside ventilation float chamber outgoing channels 24, 25 one-way, the internal ventilation through one with the other, so that once the intake duct section 9 The inlet duct of the carburetor connected to the duct reaches the outgoing duct 8 with which the float comes. mer outgoing channel 24 and on the other hand the with In connection with the recently fixable 50 to the section 7 of the intake channel 2 connected channel ren increase in the low-boiling fuel content 10 and the second from the float chamber frequent driving errors in the hot idle and hot run channel 25 are connected, with one in the Start operation reported, which leads to a boiling fuel atmosphere or to an activated carbon trap 26 caused. As a remedy for this, it is known that two channels 27 are closed by the slide rod 11. Provide channels leading from the float chamber 55. When the engine is switched off, the pressure in the combustion outlet falls and to achieve an air flow with a substance feed line 18, which as a rule has a return intake duct sections are connected, between which circuit 28 to the fuel tank, so that the spring there is a pressure difference during engine operation. 19 move the slide rod 11 into the first end position The one known from the published patent application cited above (FIG. 3). In this end position, the closes The device is therefore not readily available on the slide rod 11 with the sections 7, 9 of the Anüber two channels ventilated float chamber suction channel 2 connected channels 8,10 and opens the. equipped carburetor transferable, since no means for the in the atmosphere or to the activated carbon trap 26 lead control multiple channels are shown. channel 27 so that the gas space 14 of the floating The object of the invention is therefore to provide a generic chamber over the channel 24 and through the open spaces To equip the carburetor with a device, the chamber 22 formed with 65 rotation of the slide rod the combination of both measures enables. the channel 27 connected to the atmosphere and through This task is linked to the activated charcoal trap 26 in the identification of the pass. tentanspruchs 1 mentioned features solved. Advantage- This means that after the mo-