JPS63268923A - Exhaust device for v-type engine - Google Patents

Abstract

PURPOSE:To improve the engine faculty and reduce the exhaust noise by bending an individual collected exhaust passage extended from an exhaust manifold on the side close to an exhaust collection part, making a detour in the reverse direction to the exhaust collection part. CONSTITUTION:An individual exhaust passage 14 extended from an exhaust manifold 12 on the side close to an exhaust collection part 15 is bent, making a detour in the reverse direction to the direction toward the exhaust collection part 15, and the length of each individual collected exhaust passage 13, 14 is made equal. Therefore, the interference of exhaust in the exhaust collection part 15 is avoided, and the smooth scavenge is carried out, and the engine faculty can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an exhaust system for a V-type engine in which exhaust manifolds are provided on each outer side of both banks.

(Conventional technique 1 also) Conventionally, in y%+4 engines, as seen in Japanese Patent Application Laid-Open No. 57-1191428,
The structure is such that several intake manifolds are placed in the spaces between the two banks, which are arranged to form one, and exhaust manifolds are placed on the outside of each of the two banks. known to.

If the above structure is due to each exhaust? Individual collective exhaust passages for each manifold are extended from the collective parts of the two folds, and the above-mentioned individual collective exhaust passages are further collected outside the engine, and a T
The downstream common exhaust passages are connected, thus configuring the exhaust Ha.

By the way, in such a V-type engine exhaust system, if the lengths of the individual exhaust passages to the exhaust collecting section are different for each exhaust manifold, the exhaust from each cylinder in one bank and the exhaust from each cylinder in the other bank will be different. Interference between the exhaust gas from the cylinders at the exhaust collecting section prevents smooth scavenging, resulting in a decrease in engine performance and an increase in exhaust noise. Therefore, in order to improve engine performance, etc., each of the above individual It is desirable that the lengths of the exhaust collection parts be approximately equal. However, in the conventional air loss device of this type, the length of each individual collective exhaust passage is significantly increased by y4 due to the following circumstances, and it is impossible to make each individual collective exhaust passage the same length with a compact w4 length. It was difficult.

In other words, the layout of a conventional exhaust system of this type is explained with reference to Fig. 6 (a>(b)). The left side of the engine body is shown as the width side), both banks 2.3 of the engine body are arranged to face each other in the front and rear, and since the upstream side common exhaust passage 36 extends to the rear of the engine, each exhaust manifold The exhaust collection section 35 that collects the individual collection exhaust passages 33 and 34 extending from the exhaust gas passages 31 and 32 and connects them to the downstream common exhaust passage 36 is arranged on the side of the rear bank. Individual collective exhaust passage 3
3.34 1IIIIV! If the individual exhaust gas passages 34 of the multi-side exhaust manifold 32 are formed toward the exhaust gas collection portion 35 , the individual exhaust gas passages 34 of the multiple-side exhaust manifold 32 are considerably shorter than the individual exhaust gas collection passages 33 of the front side exhaust manifold 31 . In addition, in the vertical type engine installed in FR, both banks 2 and 3 of the engine body are arranged opposite to each other on the left and right sides of the vehicle body, as shown in Fig. 6(b). However, the transmission, etc. is installed at the rear of the center part within the width of the engine, so in order to install the exhaust system with the transmission, etc. facing away, the exhaust collecting part 45 should be shifted to one side of the bank 3-. It has no choice but to be placed in Therefore, in this case as well, the exhaust installed on bank 3- on one side? Individual collective exhaust passage 4 of two bolds 42
Is 4 the other exhaust? Individual collective exhaust passage 4 of second hold 41
Much shorter than 3.

(Purpose of the Invention) In view of the above circumstances, the present invention has been developed to maintain the exhaust system in a compact structure, while making the individual collective exhaust passages of a pair of exhaust exhaust holes of the Type T engine approximately equal lengths. The present invention provides an exhaust system for a Vt engine that improves bamboo knots and reduces exhaust noise.

(Structure of the Invention) According to the present invention, an exhaust manifold is attached to each outer side of both banks of a V-type engine, and each exhaust manifold is attached to each outer side of both banks of a V-type engine. In an exhaust system for a V-type engine, in which an exhaust collecting part for roughly collecting individual collecting exhaust passages extending from collecting parts for every two holds is provided in a position biased toward one bank side, the above-mentioned exhaust Exhaust on the side closer to the gathering area?
The individual collective exhaust passages extending from the second hold are detoured in a direction opposite to the direction toward the tenth exhaust assembly joint and bent in a folded manner, thereby making each of the individual collective exhaust passages approximately equal in length. It is.

In other words, the exhaust on the side closer to the above exhaust collection part? By increasing the length of the individual collective exhaust passages extending from the second hold, the quality of each individual collective exhaust passage is made uniform.

(Example) Figures 1 to 3 show an example of the present invention, and this example is a case where the present invention is applied to a horizontally mounted V-type engine for a front-wheel drive vehicle. In the figures and FIG. 3, the left side of the figure is the front side of the vehicle body, and the right side of the figure is the rear side of the vehicle body. 1st
In the figure, a cylinder block 1 of an engine is formed in a V-shape, and both banks 2 and 3 are provided with cylinder heads 4.5, respectively. Then, a predetermined number is placed in each bank 2.3 (■3 in the case of a 6-cylinder engine).
Each cylinder 6 is provided with intake bows 1 to 7 and an exhaust boat 8, which are open to combustion, formed in the cylinder heads 4, 5.

An intake manifold 9 is disposed between the banks 2 and 3 and is connected to both cylinder heads 4.degree. 5 and communicates with each of the intake boats 7. Furthermore, exhaust manifolds 11 and 12 are installed on the outer sides of both banks 2 and 3, respectively.

Each exhaust above? As shown in FIGS. 2 and 3, the second hold 11.12 has a predetermined number of branch portions 11a, 12a that communicate with the intake boat 7, and convergent portions 11b, 12b that communicate with these, Each gathering part 11b,
Individual collective exhaust passages 13.14 extend from 12b. An exhaust collecting section 15 that further collects the individual collecting exhaust passages 13 and 14 is located at the bottom of one side of the rear bank 3, and a downstream common exhaust passage 16 extends from this exhaust collecting section 15 toward the rear of the engine. There is. Therefore, the exhaust collecting section 15 is the front side exhaust. It is located relatively far from the second fold 11 and relatively close to the exhaust manifold 12 on the rear side.

An individual collective exhaust passage 13 extending from the exhaust exhaust hold 11 on the front side extends downward on one side of the bank 2,
It is formed so as to extend further rearward to reach the exhaust gas collection section 15. On the other hand, the individual collective exhaust passages 14 extending from the exhaust manifold 12 on the rear side are connected to the exhaust collective part 15.
Take a detour in the opposite direction to the direction you are heading to and exhaust the air? It is bent so as to be folded back toward the t side of the two-bold 12, and then reaches the exhaust collection section 15.

According to this structure, the individual collective exhaust passage 14 extends from the exhaust manifold 12 on the rear side near the exhaust collective part 15.
Since the passage length is increased by having the detour shape as described above, the passage quality is 1q which is comparable to that of the individual collective exhaust passage 13 extending from the front side υ1 air intake hold 11. In this way, each of the individual collective exhaust passages 13.
By making the passage lengths of the exhaust gases 14 almost equal, the T8 of 1 air at the exhaust collecting part 15 can be avoided, resulting in a smooth II.
As a result, engine performance is increased and exhaust noise is reduced.

In addition, in a V-type engine, both banks 2.3 are widened at the top, and there is ample space in the outer lower part of the bank 3, so the individual collective exhaust passage 14 is bent in a detour shape in this part. Even if the whole engine is
No loss of compactness.

FIG. 4 and FIG. 5 show another embodiment of the present invention, and this embodiment shows the case where the present invention is applied to a vertically mounted V-engine for an FR vehicle. 2' and 3' are arranged to face each other on the left and right sides of the vehicle body. And each exhaust on the outside of this left and right bank 2-13-? Two holds 21.22 are installed and each exhaust? The exhaust collecting section 25 that collects the individual collecting exhaust passages 23 and 24 extending from the second hold 21 and 22, respectively, is located in the bank 3 on one side in order to avoid interference with the transmission, etc.
', and from this exhaust collecting part 25
A common exhaust passage 26 extends in nine directions. In this case as well, the individual collection 111 air passage 24 extending from the exhaust gas hold 22 on the side closer to the exhaust gas collection portion 25 is connected to the exhaust gas collection portion 25.
It is formed so that it detours once toward the front of the bank 3', which is the opposite direction to the direction toward the exhaust gas 5, and is bent to the upper side of the exhaust exhaust hold 22, and reaches the exhaust collecting part 25. . Since the other parts are the same as those in the first embodiment, they are given the same reference numerals and the explanation will be omitted.

Even in this case, each of the individual collective loss-of-air passages 21.
The lengths of 22 are approximately the same, and the same effect as in the first embodiment can be obtained.

(Effect of Fe Light) As described above, the present invention has two exhaust gases installed on the outside of both banks of the desired engine. Of the individual collective exhaust passages extending from the second hold and collected at the exhaust collecting part, the individual collecting exhaust passages extending from the exhaust second hold on the side closer to the exhaust collecting part are connected to the exhaust collecting part. Because it is detoured in the opposite direction from the direction toward the engine and bent in a folded shape, the exhaust system is placed in a clean position, and the quality of each of the individual collective exhaust passages is approximately equal, improving engine noise and reducing engine noise. This is a structure that can be advantageous to Masao Makoto.

[Brief explanation of drawings]

Fig. 1 is a front view of the entire V-type engine showing one embodiment of the present invention, Fig. 2 is a perspective view of the exhaust system, Fig. 3 is an explanatory diagram of the passage configuration of the exhaust system, and Fig. 4 is another embodiment. A schematic plan view showing an example, FIG.
Figures (a) and (b) are explanatory diagrams of the passage structure of an exhaust system for a conventional ■-type engine. 2.3.2': 3-...bank, 11.12.21°22...jJF air hold, 13.14.23.
24...Individual collection 111' air passage, 15.25...
Assembling Department. Patent applicant Mazda Co., Ltd. Agent
Person Patent Attorney T Kosho Etsushi Dou
Patent attorney 1) Patent attorney t
Yasuo Itaya Figure 1 Figure 2! 5 Figure 3 Figure 4 Figure 5
Figure 6

Claims (1)

[Claims] 1. Exhaust manifolds are attached to the outer sides of both banks of the V-type engine, and an exhaust collecting part that further collects the individual collecting exhaust passages extending from the collecting part of each exhaust manifold is installed on one side. In an exhaust system for a V-type engine, which is installed in a position biased toward the bank side, the individual collective exhaust passages extending from the exhaust manifold on the side closer to the exhaust collecting section are arranged in the opposite direction to the direction toward the exhaust collecting section. An exhaust system for a V-type engine, characterized in that each of the individual collective exhaust passages is made approximately equal in length by being detoured in a direction and bent in a folded manner.