JPS58104317A - Exhaust path of v-type engine - Google Patents

Abstract

PURPOSE:To prevent an exhaust manifold or the like from thermal deformation by escaping constitutionally the thermal deformation produced in both left and right side exhaust manifolds with planer slide in a connection flanges of connecting pipes interconnecting both exhaust manifolds. CONSTITUTION:One manifold 12 is mounted on a cylinder head so that branch pipes 12A communicate respectively to a plurality of cylinders. The other manifold 13 approximately parallel to said manifold 12 is provided with combined branch pipes 12B for combining exhaust from the manifold 13 to form an aggregate 12C. And the manifold 13 and the combined branch pipes 12B are interconnected through connecting pipes 14. Also, the contact surfaces of a flange 15a of the manifold 13 and a flange 15B of the connecting pipe 14 are orthogonal to those of a flange 16A of the connecting pipe 14 and a flange 16B of the branch pipe 12B and the former is orthogonal to the parallel axes of the manifolds 12, 13 and the latter parallel to same.

Description

[Detailed description of the invention] Thermal deformation that occurs in the left and right manifolds, etc., which is the same, is released by sliding in the surface direction at the contact flange of the connecting pipe that connects both manifolds, thereby causing the thermal deformation that occurs in the exhaust system. It is 5K thick to prevent damage.

For example, the exhaust path of a conventional VG engine, that is, an engine having a plurality of cylinders arranged in five rows with respect to the crankshaft, is described in Japanese Jitsukai Shohyo Tixzot. Fl! 4
There is one as shown in FIG. Here, l is the engine body, and K and J are exhaust manifolds arranged parallel to each other and have branch pipe combs and JA that communicate with the exhaust boats (not shown) of the cylinder head /M and /B, respectively. . A joint pipe 4 and a girder are attached to these manifolds and 3 through flanges S and 5, and the other end of the joint pipe 6 and the joint pipe is connected to the collecting part 10IIC through 7 rank parts 1 and t. Ru. // is a silencer.

411 was made in Tonoyo 5, and the exhaust from the cylinder head I valley exhaust boat is connected to the branch pipe com,
through the manifold and the joint pipe 6 to the gathering part 10K,
Also, the exhaust from the % exhaust port of cylinder head/B is from branch pipe 3m, manifold J and junction 11? After that, the sound is heard by Mio Kaai, and from there it is emitted outside through a silencer.

However, this 5-value rice v! In the exhaust path of I Shin Seki I, the exhaust manifold co and J are connected to a separate assembly s10 by joint pipes 4 and girders, respectively, and the rock pillows are connected to each flange part. 1 and z, 1
The configuration is such that each of the two terminals is attached by a port H11 (not shown) at each terminal.

For this reason, during operation of the flIFI 41, thermal expansion in the direction of the rotational axis of the engine (in the direction of the cylinder row) in the exhaust gas w=hole cylinder and J presses the set s10 in the same direction via the joint pipes 6 and 7. It acts as a force to
When the engine stops I#, the cooling in the cylinder row direction in the manifold CO and JK is 0. - acts as a pulling force in the same direction at the gathering point. Therefore.

Due to the influence of such thermal deformation in the manifold co. and 3, the joint pipes 4 and 7 may be deformed, cracks may occur in the manifold co. and 3 themselves, or each flange portion 41. Exhaust leaks may occur at J, J, and D.

In addition, when assembling the exhaust passage, in order to prevent the above-mentioned accidents by eliminating internal distortion in each member during installation, it is necessary to minimize dimensional errors in the manifold connector and 3 etc. This improves productivity as finishing accuracy improves.

It is an object of the present invention to eliminate the above-mentioned drawbacks, to form one exhaust manifold into seven parts with a convergence part, and to connect the branch pipe provided at this gathering part and the other manifold with an abbreviated shape. The exhaust between V-type machines is connected by a shaped connecting pipe, and the flange surface of the joint flange used for this connection is made slidable to release thermal deformation in the direction of the cylinder row in the exhaust system and in the direction perpendicular to this. It is there to provide a route.

The present invention will be described in detail below based on the drawings.

In the following, the same symbols will be used for parts similar to those in the @/figure.

Figure 2 shows an embodiment of the urine invention. /2 is an exhaust manifold in which each branch pipe/comb is attached to the cylinder head/AK so as to communicate with a plurality of cylinders; A merging branch pipe/2B is provided to join the exhaust from the other manifold/J which is approximately parallel to the other manifold saw to form a collection part/J. LD is a connecting pipe that connects the manifold 13 and the confluence/branch pipe/JR, and is made into a straight pipe of sufficient thickness or cast. Also, the connections are at the flange of manifold 13, /jB, /! A is 7 langes with connecting pipes, /
4B is the 7 langes of the branch pipe/-B of the manifold saw. Here, 7 lunges/, 1 m.

The positional relationship between /jB and 7 langes 16 and 76B is such that the joint surfaces of these flanges are perpendicular to each other, and the joint surfaces of 7 flange /jA and /jB are connected to manifolds /J and /J. In the direction perpendicular to the parallel lines formed by
Also, the joint surface of the 7 langes 16 and /4B should be in the same direction as the parallel plane of the manifold saw, /J.

Figure 3 shows the details of the mounting structure for 7 langes /, tA and /jB.
The diameter of the bolt hole /7 provided in the lunge /jB is set to 7g for the bolt.
The hole is drilled large enough to have the required gap (2) around the diameter of the hole. Thereby, expansion and contraction of the container tube in the left and right direction in FIG. 1 can be absorbed. Here, 19 is the backing. Also, the mounting structure for 7 flange /AA and /6B is the same, for example, the flange /48KM of connecting pipe 14I-
If the diameter of the installed bolt hole (not shown) is made larger than the diameter of the bolt (not shown), thermal deformation in the cylinder row direction that occurs in the manifold 13 and the connecting pipe A can be avoided. /3 thermal deformation in the cylinder row direction. Furthermore, in Figure 1, 〃 is the exhaust front tube connected to the exhaust manifold saw, 〃 is the exhaust gas treatment catalyst, and 〃 is the exhaust front tube connected to the exhaust manifold saw.
The exhaust gas from the exhaust gas is either directly led to a muffler (not shown) or, as shown in the figure, passed through a catalyst and then led to a muffler and discharged.

In the exhaust passage of the vt1g engine/ configured in this way, the manifold/co, /3 and the connecting pipe// due to thermal deformation.
+1 expands or contracts in each axial direction, but in the cylinder row direction, even if there is a difference in displacement between manifold /2@ and manifold /J14 due to thermal deformation of joint /4I, flange /mA The difference can be absorbed by the slip K on the joint surface between and /AB. Further, in the direction perpendicular to the cylinder row, the displacement of the container tube can be absorbed by the sliding of the joint surface between the 7 lunges /jA and /jB. That is, the connecting pipe L is connected to the two almost perpendicularly axially first exhaust manifold/2 and the first exhaust manifold/2 of the connecting pipe L.
Can move relative to 3.

As explained above, according to the present invention, seven branch pipes are formed to merge the exhaust from one manifold K and the other manifold of the Vmga section, and the combined branch pipe and the other manifold are connected to each other. The connection is made by an abbreviated connecting pipe, and the joint surfaces of the flanges at both ends connecting this II pipe are orthogonal to each other, and the direction of the cylinder row and the direction orthogonal to that direction are made. Since the displacement of the container pipe due to the heat is absorbed by the sliding of the joint surfaces of the flanges, damage and deformation of the exhaust manifold and the connecting pipe due to heat can be prevented, and exhaust leakage from the joint surfaces of the flanges can be prevented.

In addition, according to the present invention, there is no need to use a bellows pipe as the connecting pipe, contributing to durability, reduction in ** and productivity improvement, and further,
By installing a branch pipe on one manifold and eliminating the conventional gathering part, the number of parts can be reduced and there are fewer connections, which not only improves cooling and facilitates maintenance and inspection, but also reduces production costs. can be reduced.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing an example of an exhaust path between conventional V-type machines,
Figure 1 is a configuration diagram showing an example of an exhaust path between the V-type machines of the present invention;
The gs diagram is an enlarged view showing details of the flange portion. l...engine, /A, /B...shilling head, J...first and first exhaust manifold, com, com...branch pipe, p, zmle de...flange part, 4.7... Junction pipe, IO... Gathering part, l/・
··Silencer. /J...1st and 2nd exhaust manifold °
, /mu...branch pipe, 72B...merging branch pipe, /X...collection part, /reference...connecting pipe, /
Im, /jB, /4m, 16t...7 lunge, l...bolt hole, /1...holt, lde...backing, X...front tube, J/... ·catalyst. Patent Applicant: Nippon Motors Co., Ltd.

Claims (1)

[Claims] first and second exhaust manifolds that collect the exhaust gas of the cylinders arranged in a row with respect to the crank axis through a plurality of branch pipes communicating with the cylinders;
In the exhaust passage between the 5K V-type machines, in which the exhaust gas from the second exhaust manifold is merged and discharged, the g/exhaust manifold has a merge branch pipe that merges the exhaust gas from the first exhaust manifold, and the The first exhaust manifold and the confluence branch pipe are connected by an If@L-shaped connecting pipe, and the connecting pipe is connected to the Is/ and #IJ exhaust manifold in one direction of one axis substantially orthogonal to the connecting pipe. An exhaust path for a Vd engine, characterized in that it is provided with Km so that it can move relative to the engine.