JPH0571448A - Mixture forming device for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Objective] In the known art, the distribution of the air-fuel mixture to the individual cylinders is non-uniform due to the asymmetric air inflow. Allows even distribution of air-fuel mixture. A fuel supply casing 6 in which a first intake pipe portion 7 is provided, and a throttle provided in a second intake pipe portion 8 that is arranged downstream of the fuel supply casing via a packing. A mixture of an internal combustion engine having a casing 5 and a throttle mechanism 12 for squeezing the flow cross section 2 of the intake pipe to some extent in the second intake pipe portion. In the device 1, the flow resistor 13 is fastened between the fuel supply casing 6 and the throttle casing 5, and the contoured portion 20 of the flow resistor penetrates at least partially into the flow cross section 2. There is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply casing provided in a first intake pipe portion and a second intake pipe portion disposed downstream of the fuel supply casing via a packing. A mixing of an internal combustion engine having an internally provided throttle casing, wherein a throttle mechanism for narrowing the flow cross section of the intake pipe is arranged in the second intake pipe portion to some extent. The present invention relates to a gas generating device.

[0002]

2. Description of the Prior Art A gas mixture producing device is known from German Utility Model Registration No. 8427954, which is disadvantageous in the distribution of the air-fuel mixture to the individual cylinders of an internal combustion engine. Because of the deviation,
The toxic exhaust gas component value increases, the fuel consumption increases, and the output decreases. The cause of such uneven distribution of the air-fuel mixture is that the air passing through the air filter or the intake pipe portion located upstream of the air-fuel mixture generating device flows asymmetrically.

[0003]

SUMMARY OF THE INVENTION The object of the invention is to eliminate this drawback in the known art, since the distribution of the air-fuel mixture to the individual cylinders is non-uniform due to the asymmetric air inflow, which is eliminated in internal combustion engines. It is to allow an even distribution of the air-fuel mixture to the individual cylinders.

[0004]

According to the constitution means of the present invention for solving the above-mentioned problems, a flow resistor is fastened between a fuel supply casing and a throttle casing, and a contour forming portion of the flow resistor is provided. At least partly at the point of entry into the flow cross section.

In contrast to the prior art, the air-fuel mixture generating device according to the present invention has a function of producing air-fuel mixture in the mixed air flow without changing the cross section of the individual intake pipe parts, and thus for each cylinder of the internal combustion engine. By having an effect on the division of the mixture, it has the advantage that the air-fuel mixture can be evenly distributed in a simple manner to the individual cylinders of the internal combustion engine. Properly designed contouring of the flow resistor thus offers, for each air-fuel mixture generator, a simple adaptation to different air-fuel mixture distribution requirements of different internal combustion engines.

[0006] Advantageous configurations and improvements of the air-fuel mixture generating apparatus according to the first aspect can be realized by the constituent means described in the second and subsequent aspects.

It is particularly advantageous for the upper and lower surfaces of the flow resistor to each have a packing outside the range of the flow cross section of the intake pipe, which makes it a component. However, the flow resistor can take on both the function of influencing the flow and the function of sealing between the fuel supply casing and the throttle casing.

Further, it is advantageous that the flow resistor is formed in a plate shape. If the flow resistor is formed in a plate shape, the flow resistor can be easily manufactured by, for example, punching. Therefore, when the flow resistor is made of metal, the manufacturing cost is particularly low.

It is also possible to construct the flow resistor from plastic, which not only simplifies manufacture, but also has the advantage of providing thermal insulation between the fuel supply casing having the fuel passage and the throttle casing. ..

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

The air-fuel mixture generating apparatus 1 shown in FIGS. 1 and 2 is arranged as a portion of an intake pipe in an air-fuel mixture compression / external ignition type internal combustion engine (not shown). The mixture generating device 1 surrounds a flow cross section 2 of the intake pipe, through which the air-fuel mixture flows in the direction of arrow 3 towards the internal combustion engine. The air-fuel mixture generation device 1 includes a throttle casing 5 and a fuel supply casing 6 arranged on the upstream side of the throttle casing.
And have. A first intake pipe portion 7 is provided in the fuel supply casing 6, and a second intake pipe portion 7 is provided in the throttle casing 5.
A second intake pipe section 8 is formed, the second intake pipe section consisting of a conically tapering conical section 9 and a cylindrical section 10 connecting in the flow direction to the conical section. ,
A throttle mechanism 12, which is embodied as a throttle valve, is arranged in the cylindrical section, by means of which the flow cross section of the intake pipe can be throttled to a greater or lesser extent. As shown in FIG. 3, a flow resistor 13 is fastened between the throttle casing 5 and the fuel supply casing 6, and the flow resistor 13 is provided on the upper surface 14 of the flow resistor 13 near the fuel supply casing 6. A packing 15 and a packing 17 on the lower surface 16 of the throttle casing 5 are mounted, particularly preferably outside the flow cross section 2 of the intake pipe.
The packings 15 and 17 are made of a known rubber elastic material or other sealing member. The flow resistor 13 is, for example, plate-shaped and made of plastic or metal. In order to influence the flow distribution in the intake pipe, the flow resistor 13 at least partly penetrates into the flow cross section 2 of the intake pipe by means of the contoured part 20 and in this case into the flow cross section 2. The penetration depth of the contour forming portion 20 of the above is different over the entire circumference of the flow cross section when viewed in the direction perpendicular to the flow direction, and the air-fuel mixture is introduced into each cylinder of the internal combustion engine. Selected to produce even distribution. Flow resistance element 1 penetrating into flow cross section 13
The three areas can have different shapes than a single plate and can extend, for example, with a chamfer or a curve. The flow resistor 13 made of metal or plastic can be manufactured by stamping or by another manufacturing method.

An air filter 21 is mounted on the fuel supply casing 6. The fuel supply casing 6 has at least one web portion 22 which is
Of the first intake pipe portion 7 and has a stepped mounting hole 23 at its end in the first intake pipe portion 7 in which fuel injection is concentric with the flow cross-section 2. A valve 24 is fitted and fuel is ejected toward the throttle mechanism 12 via a mouthpiece 25 of the fuel injection valve. On the side away from the mouthpiece 25, the mounting hole 23 is closed by an inner lining 27, which is streamlined like the web portion 22. The fuel injection valve 24 is partially surrounded in the axial direction by a sieve body 28, which is in contact with the peripheral wall surface of the mounting hole 23 by means of a ring web 29 and thus the circumference of the sieve body 28 and the mounting hole 23. The fuel supply annular groove 30 is separated from the wall surface by the fuel return annular groove 31. Although not shown, the fuel from the fuel supply annular groove 30 passes through the first sieving area 33 and is not shown.
Of the fuel, and is ejected from there through the cap 25, or, although not shown, part of the fuel injection valve 24 re-emerges and flows through the second sieving section 34 for fuel recirculation. It can reach into the annular groove 31. A fuel supply passage 35 opens into the annular fuel supply groove 30, the fuel supply passage extends partly in the web portion 22, and the fuel flows through the fuel supply passage 25 by means of a fuel source, for example a fuel pump. It is supplied to the fuel injection valve 24 via. In the fuel supply casing 6, a fuel recirculation passage 36 is formed above the fuel supply passage 25, and the fuel recirculation passage 36 starts from the fuel recirculation annular groove 31 of the mounting hole 23.
I am familiar with 7. The air-fuel mixture generation device 1 may have a carburetor instead of the fuel injection valve.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an air-fuel mixture generation device configured according to the present invention.

FIG. 2 is a plan view of an air-fuel mixture generation device.

FIG. 3 is a partial cross-sectional view of an air-fuel mixture generation device having a flow resistor.

[Explanation of symbols]

1 Mixture Generator, 2 Flow Cross Section, 3
Arrows indicating flow direction, 5 throttle casing, 6 fuel supply casing, 7 first intake pipe portion, 8
Second intake pipe portion, 9 conical section, 10 cylindrical section, 12 throttling mechanism, 13 flow resistor,
14 upper surface, 15 packing, 16 lower surface,
17 packing, 20 contour forming part, 21 air filter, 22 web part, 23 stepped mounting hole, 24 fuel injection valve, 25 base,
27 inner lining, 28 sieving body, 29 ring web, 30 fuel supply annular groove, 31 fuel recirculation annular groove, 33 first sieving area, 34
Second sieving area, 35 Fuel supply passage, 36
Fuel return passage, 37 pressure regulating valve

Claims (5)

[Claims] 1. A fuel supply casing (6) in which a first intake pipe portion (7) is provided, and a second intake pipe portion (6) arranged downstream of the fuel supply casing via a packing. 8) with a throttle casing (5) installed therein,
An air-fuel mixture generating device for an internal combustion engine (1) in which a throttling mechanism (12) for throttling the flow cross section (2) of the intake pipe is arranged in the second intake pipe portion to some extent ), Fuel supply casing (6) and throttle casing (5)
And a flow resistor (13) is tightened between the flow resistor and the contour forming portion (20) of the flow resistor at least partially penetrates into the flow cross section (2). , Mixture generation device for internal combustion engine. 2. A packing (15, 17) is provided on each of the upper surface (14) of the flow resistor (13) near the fuel supply casing (6) and the lower surface (16) near the throttle casing (5). 2. A mixture generator as claimed in claim 1, characterized in that (1) is mounted outside the range of the flow cross section (2). 3. The air-fuel mixture generating device according to claim 1, wherein the flow resistor (13) has a plate shape. 4. The mixture generating device according to claim 1, wherein the flow resistance body (13) is made of metal. 5. The mixture generating device according to claim 1, wherein the flow resistance body (13) is made of plastic.