JPS5945803B2 - Engine intake passage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention primarily relates to an intake passage device for an automobile engine.

Originally, in this type of engine, especially during low-speed, low-load operation, the intake speed of the air-fuel mixture was relatively increased, and the air-fuel mixture was swirled and guided into the combustion chamber to create turbulent flow within the chamber. It is preferable that there be.

The object of the present invention is to obtain a device that satisfies such requirements. In an engine intake passage device that communicates with the intake passage, a primary intake passage with a relatively small cross-sectional area is connected to the primary passage by a partition wall extending approximately the entire length of the intake passage, and a primary intake passage with a relatively small cross-sectional area is connected to the secondary passage. The secondary intake passage has a relatively large cross-sectional area, and the partition wall is arranged so that its longitudinal part on the upstream side is in a substantially horizontal plane and the downstream part in the engine is in a substantially vertical plane. It is characterized by being turned approximately 90 degrees.

An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawings, reference numeral 1 indicates a carburetor, and the carburetor 1 is constructed in a multi-stage type having a primary side passage 2 and a secondary side passage 3 in parallel with each other, and is connected to the engine via an intake passage 4. It communicates with an intake port 7 on the side thereof which leads to a combustion chamber 6 in the combustion chamber 5. 8 in drawings
9 is the air cleaner at the upstream end of the carburetor 1, and 9 is the intake passage 4.
A hot water chamber for heating the mixture installed on the lower surface of the upstream side of the
0 is an intake valve at the downstream end of the intake port 7, 11 is an exhaust valve on the other side adjacent to this, 12 is an exhaust passage extending outward through the valve 11, and 13 is a piston forming the lower surface of the combustion chamber 6. , 14 indicates the lower crankshaft. The drawings show the case of an engine with each cylinder, and the lower end of the carburetor 1 is assumed to be a distribution chamber, from which a plurality of intake passages 4 are led out, as clearly shown in FIG.

The above is not particularly different from the conventional one, but according to the present invention, the following configuration is adopted in order to improve the characteristics particularly in the low speed and low load region.

That is, the partition wall 1 extends within the intake passage 4 over substantially its entire length.
5 is installed horizontally, and the inside thereof is connected to the primary side passage 2, which is approximately the same as this, and the inside thereof is connected to the primary intake passage 16 on the lower side of the lower side, which has a relatively small cross-sectional area, and this, which is connected to the secondary side passage 3. A partition is formed in the upper secondary intake passage 17 having an equal and relatively large cross-sectional area, and the partition wall 15 is turned approximately 90 degrees between the upstream side and the downstream side.
That is, to explain this in detail, the section wall 15 exists in a substantially horizontal plane in its longitudinal portion on the upstream side, and is twisted near the downstream end so that its downstream side lies in a substantially vertical plane.
In the figure, the partition wall 15 is formed integrally with the internal part of the engine 5 body, and is formed separately from the outer circumferential tubular member forming the intake passage 4 in the upstream part thereof. Needless to say, there are no limitations. To explain its operation, when the engine 5 is operated at low speed and low load, the primary side passage 2 of the carburetor 1 is operated;
The air-fuel mixture generated within the engine is guided into the combustion chamber 6 in the engine 5 via the lower primary intake passage 16 in the intake passage 4 connected thereto, and during this operation, the passage 16 is Since the air-fuel mixture extends over approximately the entire length of the passage 16, the mixture flows at a relatively high velocity within the passage 16 and is guided into the combustion chamber 6. At this time, the partition wall 15 is also turned approximately 90 degrees on the downstream side thereof. As a result, the flow of the air-fuel mixture is also diverted along this direction and guided into the combustion chamber 6 in the form of a swirl, creating turbulent flow within the chamber 6.

Thus, the relatively high-speed flow of the air-fuel mixture helps increase the output torque of the engine 5, and the turbulent flow within the combustion chamber 6 is effective in preventing the occurrence of knocking and increasing combustion efficiency.
In this way, when the present invention is used, especially when the engine is operated at low speed and low load, the air-fuel mixture has a relatively high intake speed and is given a swirl before being guided into the combustion chamber, improving the intake efficiency and increasing the output torque. At the same time, combustion is improved and there is no occurrence of knocking, etc., which has the effect of improving combustion efficiency and fuel consumption.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of one example of the device of the present invention, and FIGS. 2 to 4 are cross-sectional views thereof taken along lines...--■, ■--■, and ■--. 1... Carburizer, 2... Primary side passage, 3
...Secondary side passage, 4...Intake passage, 5
...Engine, 7...Intake port, 15.
... Ward wall, 16 ... Primary intake passage, 1
7...Secondary intake passage.

Claims (1)

[Claims] 1. In an engine intake passage device in which the inside of a carburetor having a primary side passage and a secondary side passage is communicated with an intake port of the engine via an intake passage, the inside of the intake passage is connected over substantially the entire length thereof. The extending partition wall is used to partition a primary intake passage with a relatively small cross-sectional area connected to the primary side passage and a secondary intake passage with a relatively large cross-sectional area connected to the secondary side passage, and the partition wall is An intake passage device for an engine, characterized in that the longitudinal portion on the upstream side lies in a substantially horizontal plane, and the internal portion of the engine on the downstream side is turned about 90 degrees from each other so that it lies in a substantially vertical plane.