JPS6126616Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to improvement of a multi-cylinder engine.

(Prior Art) In a multi-cylinder engine, in order to improve engine performance, how to properly and evenly distribute the air-fuel mixture to each cylinder is an important technical issue. Since the proper distribution of air-fuel mixture to each cylinder depends on the shape of the intake manifold, there is an urgent need to improve this. However, conventionally, it has been considered extremely difficult to optimize the distribution of the air-fuel mixture by changing the shape of the intake manifold for the following reasons. In other words, (1) To determine the shape of the intake manifold,
It requires numerous prototypes and experiments, and it is not easy to determine its shape. Furthermore, (2) the shape of the intake manifold is restricted from the layout perspective, so even if the shape of the intake manifold is determined through numerous trial productions and experiments, it is difficult to apply it as is.

Therefore, it was devised to connect at least two of each intake passage of a multi-cylinder engine,
There is one that aims to balance the pressure between each cylinder. The pressure balance passage provided for this purpose is formed in the intake manifold or cylinder head.

(Problem to be solved by the invention) When a pressure balance passage is formed in the intake manifold or cylinder head in this way,
These intake manifolds or cylinder heads have a unique shape that is different from conventional ones.
It becomes a structure. For this reason, there arises a problem that there is no compatibility with conventional ones, that the number of manufacturing steps increases, and that costs increase. The present invention has been developed in view of this point, and allows a plurality of intake passages to communicate with each other without making any changes to the intake manifold or cylinder head.

(Means for Solving the Problems) The present invention is a means for solving the above-mentioned problems.In a multi-cylinder engine in which a plurality of intake passages are arranged side by side, an intake manifold is installed between a cylinder head and an intake manifold. A plurality of intake passages are formed in the packing by providing a long hole along the longitudinal direction of the packing in a portion between the plurality of intake passages and the outer periphery of the packing, and making the long hole communicate with each of the plurality of intake passages. A pressure balance passage is formed that communicates at least two of the two.

(Function) With this configuration, the pressure balance passage can be formed at the same time as the packing is punched and molded using a press, which greatly simplifies production, and also reduces the number of assembly steps compared to conventional engines. It will be assembled without any problems. In addition, the elongated holes are provided along the longitudinal direction of the gasket between the multiple intake passages and the outer circumference of the gasket, so there is no need to change the size of the gasket without impairing the sealing effect of the gasket. This means that it is possible to provide a pressure balance passage very easily even in engines such as the following.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a cylinder head, 2 is an intake manifold, and 3 is an exhaust manifold. The multi-cylinder engine in this embodiment has four cylinders, and the intake passage 4 of the intake manifold 2 is branched into four intake passages 6, 7, 8, and 9 on the downstream side of the throttle valve 5. 10, 11, 12, and 13.

A packing 14 is interposed between the cylinder head 1 and the intake manifold 2.
The gasket 14 has a shape as shown in FIG. 2, and has intake passages (holes) 6, 7, 8, and 9 corresponding to the intake passages 6, 7, 8, and 9 of the intake manifold described above, respectively. be. These intake passages 6, 7, 8, 9 are connected to the gasket 1.
4 is connected through a pressure balance passage 15 formed in a part of 4. This pressure balance passage 1
5 is a plurality of intake passages (holes) of the packing 14;
It is formed by providing a long hole extending in the longitudinal direction between the outer periphery of the gasket 14 and the gasket 14, and communicating the long hole with each of the plurality of intake passages. Since the gasket 14 is thin, the pressure balance passage 15 may have a long hole-like shape as described above and a communicating portion facing the intake passages (holes) 6, 7, 8, and 9. However, if you insert the packing 14 when assembling the intake manifold 2 to the cylinder head 1,
At that stage, the intake passages 6, 7, 8, and 9 are brought into communication.

This multi-cylinder engine configured in this way is
When the air-fuel mixture that has passed through the throttle valve 5 passes through the gasket 14, it is equally distributed to each cylinder 10, 11, 12, and 13 by the pressure balance passage 15, so that the air-fuel mixture is properly distributed. This will lead to a change in the number of people. This improves engine output, saves fuel, and also reduces unburned exhaust gas.

In the embodiment described above, each intake passage 6, 7, 8,
Although all of the intake passages 6, 7, 8, and 9 are configured to communicate with each other through the balance passage, only the intake passages 6 and 9 located outside of each other may be communicated with each other, or alternatively, , only the intake passages 7 and 8 located on the inner side may be communicated with each other. The configuration in which only the outside or inside intake passages are communicated is particularly effective when the firing order of the cylinders 10, 11, 12, and 13 is performed in the order of 10→12→13→11. It goes without saying that the present invention is not limited to four-cylinder engines.

(Effect of the invention) It is most preferable to make the effective cross-sectional area of the pressure balance passage smaller than each effective cross-sectional area of each intake passage in order to evenly distribute the air-fuel mixture and to optimize it. Since the balance passage was provided in the packing, this requirement was inevitably met.
And since only the packing needs to be changed, manufacturing is easy and the cost is low. In addition, the pressure balance passage is formed by a long hole provided along the longitudinal direction between the plurality of intake passages of the packing and the outer periphery of the packing, and a communicating part from the long hole toward the intake passage. Since there is no need to change the size or damage the sealing effect of the seal, it is possible to improve the existing engine very easily.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of an embodiment of the present invention, Figure 2
The figure is a front view of the packing in FIG. 1. 1... Cylinder head, 2... Intake manifold, 6, 7, 8, 9... Intake passage, 14
...Patsukin, 15...Pressure balance passage.

Claims (1)

[Scope of utility model registration request] In a multi-cylinder engine in which a plurality of intake passages are arranged side by side, a gasket interposed between a cylinder head and an intake manifold has a part between the plurality of intake passages and the outer periphery of the gasket that extends along the longitudinal direction of the gasket. A multi-cylinder engine characterized in that a pressure balance passage communicating at least two of the plurality of intake passages is formed by providing a hole and communicating the elongated hole with each of the plurality of intake passages.