JPS63266112A - Exhauster for multicylinder engine - Google Patents

Abstract

PURPOSE:To alter the form and position of an exhaust converging passage and make the length of an exhaust passage easily alterable by forming the exhaust converging passage, where respective exhaust ports in plural cylinders are converged on, in an exhaust cover to be attached to a cylinder body. CONSTITUTION:Three cylinders 28, 30 and 32 are set up sideways in one side bank branched off in a V-shaped form in a cylinder body 10, and each of exhaust passages 34, 36 and 38 is extendedly installed from respective exhaust ports 29, 31 and 33 of these cylinders 28, 30 and 32, and these exhaust passage 34, 36 and 38 are opened each to an end face of the cylinder body 10. In this exhauster, an exhaust cover 24 is attached to the end face of the cylinder body 10, and an exhaust converging passage 40 is solidly formed in the exhaust cover 24, while respective exhaust receiving passages 42, 44 and 46 of this exhaust converging passage 40 are respectively interconnected to the exhaust passages 34, 36 and 38.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust bag for a multi-cylinder engine, and more particularly to the shape of an exhaust passage extending from each cylinder of a multi-cylinder engine.

[Prior Art] A major factor that determines engine performance is the shape of the exhaust passage extending from the cylinder of the engine. In particular, many multi-cylinder engines have exhaust passages or exhaust merging passages for eight cylinders, and in this case, the length from the exhaust port of each cylinder to the exhaust merging passage greatly affects the performance of the engine. .

Here, in the past, since the exhaust merging passage was formed within the cylinder body, it was extremely difficult to appropriately change the length from the exhaust port to the exhaust merging passage depending on the required engine performance. .

[Problem to be solved by the invention] In other words, in the past, the exhaust passage including the exhaust merging passage was integrally molded within the cylinder body, so the length from the exhaust port to the exhaust merging passage could be adjusted depending on the engine performance. The problem is that it is difficult to make appropriate changes and therefore difficult to obtain desired engine performance.

The present invention was made in view of the problems of the prior art, and its purpose is to easily adjust or change the length of the exhaust merging passage from the exhaust port of each cylinder in a multi-cylinder engine. To provide an exhaust system for a multi-cylinder engine that can be used.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides an exhaust gas system for a multi-cylinder engine, which is provided with a plurality of cylinders and in which the exhaust ports of each cylinder merge through at least one exhaust merging passage. In the apparatus, an exhaust gas merging passage is formed in an exhaust cover attached to a cylinder body, and the exhaust merging passage is configured to communicate with an exhaust port of each cylinder.

[Function] With this configuration, the exhaust merging passage is formed inside the exhaust cover rather than inside the cylinder body, so by changing the shape and position of the exhaust merging passage in the exhaust cover, it is easy to connect the exhaust merging passage from the exhaust port of each cylinder. The distance to this exhaust merging passage can be changed.

[Example] Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

First, FIGS. 1 to 5 schematically show a first embodiment of the present invention, in which the engine is a six-cylinder V-type two-stroke engine.

Reference numeral 10 denotes a cylinder body, which has six cylinders, three each arranged in a substantially V-shape on the left and right sides. 12
is the cylinder head, 14 is the crankcase, 16 is the intake manifold, 18 is the carburetor, 20 is the intake silencer,
22 is a cowling. Further, an exhaust cover 24 is attached to the outer wall of the cylinder body 10 at a position between the substantially V-shape of the cylinder body 10, and an exhaust gas merging passage, which will be described later, is formed within the exhaust cover 24. Further, reference numeral 26 in FIG. 4 is a flywheel magneto.

As shown in Figures 2 and 3, which are shown schematically for ease of understanding, three cylinders 28, 30, and 32 are placed in the side stirrup on one side of the cylinder body lO divided into 7 parts, that is, in the bank. The exhaust ports 29.31.33 of these cylinders are connected to exhaust passages 34.3, respectively.
6.38 extend, and these exhaust passages are connected to the cylinder body l.
It opens at the end face of O. The exhaust cover 24 is attached to the end face of the cylinder body 10, or an exhaust merging passage 40 is integrally formed within the exhaust cover 24, and an exhaust receiving passage 42.4 of the exhaust merging passage 40 is provided.
4.46 is connected to the exhaust passage 34.36.38.

Similarly, for the other bank of the figure 7 of the cylinder body lO, the exhaust ports 49,51 of the three cylinders 48,50,52
．． Exhaust passages 54, 56, 58 extend from 53 and are connected to exhaust receiving passages 62, 64, 66 of an exhaust merging passage 60 different from the exhaust merging passage 40 of the exhaust chamber 24, respectively.

As clearly shown in Figure 1.4.5, the exhaust passages 34, 36, 38 of one bank are arranged to intersect with the exhaust passages 54, 56, 58 of the other bank. Here, both exhaust passages are arranged so as not to interfere with each other, for example, the exhaust passage 54 passes through a space between adjacent exhaust passages 34, 36 of the other bank at the intersection. Note that the exhaust passage at this intersection is located exactly at the joining position of the cylinder body 10 and the exhaust cover 24, or there is no need to limit it to this, and the intersection may be provided on the cylinder body 10 side or the exhaust cover 24 side. Needless to say, it's a good thing.

According to the embodiment of such a structure, the exhaust gas merging passages 40 and 60 are separate from the cylinder body 10, and the exhaust cover 2 is attached to the cylinder body 10.
4, the length of the passage from the exhaust port of each cylinder to the exhaust merging passage 40 or 60 can be made longer than before, and when adjusting the length of the passage. This can be done easily by adjusting the position of the exhaust gas merging passage 40.60 formed in the exhaust cover 24. Furthermore, according to this embodiment, since the exhaust passage of one bank is arranged to intersect with the exhaust passage of the other bank, the length from the exhaust port of each cylinder to the exhaust merging passage can be made longer. It becomes possible. Therefore, an optimum exhaust passage length can be obtained depending on the desired performance of the engine.

Next, FIGS. 6 and 7 show a second embodiment of the present invention, in which the same or equivalent parts as in the embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and these parts are A detailed explanation will be omitted.

This second embodiment differs from the first embodiment described above in that the exhaust passages 34, 36, 38 of one bank and the exhaust passages 54, 56, 58 of the other bank are arranged parallel to each other without intersecting each other. It is.

Also in this embodiment, since the exhaust merging passages 40.60 are formed in the exhaust cabinet 24 which is separate from the cylinder body 1O, the distance from the exhaust port of each cylinder to these exhaust merging passages 40.60 is shorter than that of the conventional exhaust merging passages 40.60. The length can be longer than that, and the distance can be easily adjusted.

Next, FIG. 8 shows a third embodiment of the present invention, and this embodiment is a case of an engine in which a plurality of cylinders are arranged in a line, unlike the case of the previous embodiment. The exhaust cover 24 is attached to the side of the cylinder body 10, and only one exhaust merging passage 68 is connected to the exhaust cover 24.
There is no difference from the previous embodiment except that the exhaust merging passage 68 is formed in the exhaust cabinet 24, and the exhaust merging passage 68 is connected to the exhaust port 29 on the cylinder body 10 side. It is now possible to take longer distances. Therefore, this embodiment also has substantially the same effects as the previously described embodiment.

[Effects] As explained above, according to the present invention, the exhaust merging passage is formed in the exhaust cover separate from the cylinder body, so that the exhaust merging passage from the cylinder exhaust port, which is a major factor determining engine performance, is This has the excellent effect of making it easy to change the length to the passage depending on the desired engine performance.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the exhaust system for a multi-cylinder engine according to the present invention, and FIG.
A schematic cross-sectional view along the line, FIG. 3 is taken from III-II in FIG.
4 is a schematic left side view of FIG. 1; FIG. 5 is a schematic sectional view taken along line V-V of FIG. 4;
FIG. 6 is a schematic cutaway plan view showing the $2 embodiment of the present invention, FIG. 7 is a schematic left side view of FIG. 6, and FIG. 8 shows only the main parts of the third embodiment of the present invention. FIG. 10...Cylinder body 24...Exhaust cover 28.30.32.48°50.52...Cylinder 29.31.33.49. 51.53...Exhaust port 40.60.68...Exhaust merging passage agent Patent attorney Yoshiyuki Inaba+0+-To cylinder 24: zsun/X force,//-t+V・/Yu 〉-Go-5, two-tiri-ra Fig. 4 40160: Sakura et al. - 28, 48: Mezu29: :y!7l-)90 60: N's work θ4f and 90,000th figure 760: Jp7i-e-';'?l!la103 Nunta-
X'-, i''2 24 I=';'>'27 melyi/"-29 difference-
Tsutomu Rita

Claims (1)

[Claims] (1) In an exhaust system for a multi-cylinder engine including a plurality of cylinders, in which the exhaust ports of each cylinder merge through at least one exhaust merging passage, the exhaust merging passage is formed in an exhaust cover attached to the cylinder body, An exhaust system for a multi-cylinder engine configured to communicate this exhaust merging passage with the exhaust port of each cylinder.