JP3139018B2 - Exhaust manifold structure for V-type engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust manifold structure of a V-type engine, and in particular, to each cylinder head mounted on a V-shaped upper portion of a cylinder block so as to be inclined outwardly. The present invention relates to an exhaust manifold structure of a V-type engine in which exhaust manifolds are respectively mounted.

[Conventional technology]

As the engine of the vehicle, there are an engine in which the cylinders are arranged in series, an engine in which the cylinders are arranged in a facing state, and a V-type cylinder in which the cylinders are arranged in a V-shape, depending on the arrangement of the cylinders.

In the V-type engine, the first and second cylinder heads are mounted on the V-shaped upper portion of the cylinder block so as to be inclined outwardly, respectively. Make up a bank.

A space is formed between the first and second engine banks, and an intake manifold is disposed in the space.

Further, the first and second cylinder heads are respectively provided with respective branch pipe portions of the first and second intake manifolds, and the first and second exhaust manifolds are respectively provided with respective branch pipe portions. .

The exhaust system structure of a V-type horizontal engine is disclosed, for example, in Japanese Utility Model Laid-Open No. 64-6321. In this publication, isometric exhaust pipes connected to respective exhaust ports of a front cylinder and a rear cylinder of a V-type horizontal engine are respectively joined below the engine, and one end of the exhaust pipe is connected to a cylinder block of the rear cylinder. A bracket member that is attached and extends downward is provided, and the other end of the bracket member is attached to an exhaust pipe downstream of the junction of the exhaust pipes of the front and rear cylinders.

[Problems to be solved by the invention]

By the way, in a conventional exhaust manifold structure of a V-type engine, as shown in FIG. 8, in order to make the V-type engine 102 compact, for example, air conditioners attached to both lower sides of a cylinder block 104 of the V-type engine 102 are used. The engine accessories such as the compressor 124 and the power steering pump 126 have been arranged as close as possible to the cylinder block 104.

In addition, as shown in FIGS. 5 and 7, in order to make the exhaust manifold 122 compact, the branch pipe portion 1 of the exhaust manifold 122 is made smaller.
22-1, the mounting end face 1 of the exhaust manifold 122
The length N of the single branch, which is the distance from 22a-1 to the center S portion of the branch pipe section 122-1, is reduced, and the branch pipe section 12
2-1 is a necessary minimum cross-sectional area, and is provided in a wavy meandering manner.

As a result, the first and second exhaust manifold mounting portions 120-1 and 120-2 of the first and second cylinder heads 106-1 and 106-2 mounted on the V-shaped upper portion of the cylinder block 104 have the first position. When the second exhaust manifolds 122 and 122 are mounted, respectively,
While engine accessories such as an air conditioner compressor 124 and a power steering pump 126 disposed below the cylinder block 104 may interfere with the first and second exhaust manifolds 122, 122, the first and second exhaust manifolds 122, 122 There was an inconvenience that the engine accessory was damaged by the heat damage caused by the heat of 122.

In order to eliminate this inconvenience, as shown in FIG. 6, there is a method of inclining only the branch pipe portion 222-1 of the exhaust manifold 222 upward by a predetermined angle θ2. Since the manifold 222 is used, when the mounting bolt 228 is tightened with the box wrench 232, the box wrench 232 comes into contact with the upper portion of the branch pipe portion 222-1 and the mounting bolt 228 can be securely tightened. This makes it difficult to assemble the exhaust manifold 222.

[Object of the invention]

Accordingly, an object of the present invention is to separate the exhaust manifold from the engine accessories to prevent the engine accessories from interfering with the exhaust manifold and to eliminate heat damage caused by the heat of the exhaust manifold. Another object of the present invention is to realize an exhaust manifold structure of a V-type engine which can protect engine accessories from the engine and can easily perform an exhaust manifold tightening operation.

[Means for solving the problem]

In order to achieve this object, the present invention provides a V-type engine in which a plurality of engine accessories are disposed below a cylinder block, and a cylinder head is inclined outward in a V-shaped upper portion of the cylinder block. In the exhaust manifold structure of a V-type engine in which the exhaust manifold is mounted on each of the exhaust manifold mounting portions of these cylinder heads, a mounting flange portion of the exhaust manifold and a branch pipe portion are provided above the engine accessory. Disposing the exhaust manifold so as to cover the exhaust manifold, so as to separate the exhaust manifold from the engine accessories.
The manifold mounting surface of the exhaust manifold mounting portion of the cylinder head corresponding to the mounting flange portion of the exhaust manifold is such that a lower portion projects outwardly from an upper portion with respect to an outer inclined surface of the cylinder head. The engine auxiliary machine is formed so as to be inclined at a predetermined angle, and the engine accessory is disposed off the axis of the mounting bolt of the mounting flange portion of the exhaust manifold, and the branch pipe portion of the exhaust manifold is aligned with the axis of the mounting bolt. It is characterized by being arranged so as not to interfere.

[Action]

According to the configuration of the present invention, when the exhaust manifold is mounted on the cylinder head of the V-type engine, the upper part of the engine accessory is covered by the mounting flange of the exhaust manifold and the branch pipe, and the mounting flange of the exhaust manifold corresponds to the mounting flange. The manifold mounting surface of the exhaust manifold mounting portion of the cylinder head is inclined at a predetermined angle so that a portion below the upper portion projects outward with respect to the outside inclined surface of the cylinder head, and the engine accessory exhausts. Since the mounting flange of the manifold is removed from the axis of the mounting bolt, the exhaust manifold is separated from the engine auxiliary equipment, thereby preventing the engine auxiliary equipment from interfering with the exhaust manifold and also removing the engine auxiliary equipment. Protects against heat damage caused by the heat of the exhaust manifold, and also removes the branch pipe of the exhaust manifold. Since there is no need to use an exhaust manifold with a shorter single branch length by arranging it so that it does not interfere with the axis of the bolt, the mounting bolts can be securely tightened and the exhaust manifold can be easily attached. be able to.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

1 to 4 show an embodiment of the present invention.
3 and 4, 2 is a V-type engine, 4 is a cylinder block, 6 is a cylinder head, and 8 is a cylinder head cover. In the V-type engine 2, an oil pan 10 is attached to a lower surface portion of the cylinder block 4, and a first,
The second cylinder heads 6-1 and 6-2 are provided to be mounted, respectively, and the first and second cylinder heads 6-1 and 6-2 are provided.
, First and second cylinder head covers 8-1 and 8-2 are attached.

That is, the first cylinder head 6-1 and the first cylinder head cover 8-1 are attached to one side (the right side in FIG. 3) of the V-type engine 2 so as to be inclined outwardly, and the second cylinder head 6-2 and the second cylinder head cover 8-2 are on the other side of the V-type engine 2 (the left side in FIG. 3).
It is mounted to be inclined outward.

By mounting the first and second cylinder heads 6-1 and 6-2 on the V-shaped upper portion of the cylinder block 4,
The first and second engine banks 12-1 and 12-2 having a character shape are configured, and the first and second engine banks 12-1 and 12-2 are formed.
A space 14 is formed between -1 and 12-2. This space
An intake manifold 16 and an alternator 18 are provided at 14.

The first and second outer inclined surfaces 6a-1 and 6a-2 of the first and second cylinder heads 6-1 and 6-2 in which the intake manifold 16 is attached to the inner inclined surface portions have first and second outer inclined surfaces. Exhaust manifold mounting portions 20-1 and 20-2 are provided. This first and second
The first and second exhaust manifold mounting portions 20-1 and 20-2 have first and second
Exhaust manifolds 22, 22 are mounted.

As shown in FIGS. 2 and 4, the exhaust manifold 22 includes a mounting flange portion 22a mounted on the exhaust manifold mounting portion 20 of the cylinder head 6 with mounting bolts 28, and a branch pipe having one end connected to the mounting flange 22a for each cylinder. Part 22b, a collecting pipe part 22c connected to the other end side of each branch pipe part 22b, and an exhaust pipe part 22d connected to the collecting pipe part 22c.
Exhaust passage 22S inside c is formed with a necessary minimum cross-sectional area, and is formed so as to be wavy and meandering.
As shown in the figure, when mounted on the exhaust manifold mounting portion 20 of the cylinder head 6, the lower side of the outer inclined surface 6 a of the cylinder head 6 and the inner side of the outer end 6 b of the cylinder head 6. In the space G.

An air conditioner compressor 24 as one engine accessory is mounted below the first cylinder head 6-1 on one side of the lower part of the cylinder block 4 of the V-type engine 2 and at the lower part of the cylinder block 4. On the other side, below the second cylinder head 6-2, a power steering pump 26 as another engine accessory is mounted.

As shown in FIG. 4, the exhaust manifold 22 is provided so that a part of the mounting flange portion 22a and a part of the branch pipe portion 22b cover the upper part of engine accessories such as the air conditioner compressor 24 and the like.

Further, the first and second cylinder heads 6-1 and 6-2 are arranged so that the first and second exhaust manifolds 22 and 22 are separated from the air conditioner compressor 24 and the power steering pump 26.
First and second of the second exhaust manifold mounting portions 20-1 and 20-2
The manifold mounting surfaces 20a-1 and 20a-2 are formed to be inclined by a predetermined angle θ1.

That is, as shown in FIG. 1, the lower portion of the first exhaust manifold mounting portion 20-1 is projected outward with respect to the upper portion of the first exhaust manifold mounting portion 20-1. -1 first outside inclined surface 6a with respect to the first manifold mounting surface 20a- of the first exhaust manifold mounting portion 20-1.
1 is formed to be inclined outward by a predetermined angle θ1 (in the direction of the solid arrow in FIG. 1). Also, as shown in FIGS. 1 and 3, the engine accessories such as the air conditioner compressor 24 are disposed off the axis 28c of the mounting bolt 28 of the mounting flange 22a of the exhaust manifold 22.

Further, the second exhaust manifold mounting portion 20-2 provided on the second cylinder head 6-2 also has a second cylinder head 6-2 similar to the above-described first exhaust manifold mounting portion 20-1.
The second manifold mounting surface 20a-2 of the second exhaust manifold mounting portion 20-2 is formed to be inclined outward by a predetermined angle θ1 with respect to the second outer inclined surface 6a-2.

As a result, the first and second exhaust manifolds 22 are separated from the air conditioner compressor 24 and the power steering pump 26 by a predetermined distance.
L1 and L2 are provided separately from each other.

Further, as shown in FIGS. 1 to 3, the branch pipe portion 22b of the exhaust manifold 22 is provided so as not to interfere with the axis 28c of the mounting bolt 28.

 Next, the operation of this embodiment will be described.

First and second cylinder heads 6-1 of the V-type engine 2,
When attaching the first and second exhaust manifolds 22 to the 6-2, respectively, the first outer inclined surface of the first cylinder head 6-1
6a-1, the first exhaust manifold 22 is mounted on the first exhaust manifold mounting portion 20-1 in which the first manifold mounting surface 20a-1 is inclined outward by a predetermined angle θ1, and the second cylinder head 6--1 is mounted. 2 second outer inclined surface 6a-2
The second manifold mounting surface 20a-2 is at a predetermined angle θ1
The second exhaust manifold mounting portion 20 inclined only outwardly
-2, a second exhaust manifold 22 is attached, the first manifold 22 and the air conditioner compressor 24 are separated by a predetermined distance L1, and the second exhaust manifold 22 and the power steering pump 26 are separated by a predetermined distance L2. I have. Further, engine accessories such as the air conditioner compressor 24 are disposed off the axis 28c of the mounting bolt 28 of the mounting flange 22a of the exhaust manifold 22.

This prevents the first and second exhaust manifolds 22 and 22 from interfering with the air conditioner compressor 24 and the power steering pump 26, and also allows the air conditioner compressor 24 and the power steering pump 26 to heat the first and second exhaust manifolds 22 and 22. To protect against heat damage caused by heat and also to the branch pipe section of the exhaust manifold 22
The first and second exhaust manifolds 22b are arranged so as not to interfere with the axis 28c of the mounting bolt 28, and it is not necessary to use the first and second exhaust manifolds 22, 22 having a reduced single branch length. A space for mounting the first and second exhaust manifolds 22 and 22 can be easily secured by securing a space for mounting the first and second exhaust manifolds 22 and 22.

In addition, while avoiding the conventional inconveniences, the engine accessories such as the air conditioner compressor 24 and the power steering pump 26
The second cylinder heads 6-1 and 6-2 can be disposed compactly, which can contribute to space saving.

〔The invention's effect〕

As apparent from the detailed description above, according to the present invention, the exhaust manifold is disposed so as to cover the upper part of the engine accessory by the mounting flange portion and the branch pipe portion of the exhaust manifold, and the exhaust manifold is separated from the engine accessory. The manifold mounting surface of the exhaust manifold mounting portion of the cylinder head corresponding to the mounting flange portion of the exhaust manifold is predetermined such that the lower portion protrudes outward from the upper portion with respect to the outer inclined surface of the cylinder head. At the same time, the engine accessories were arranged off the axis of the mounting bolts on the mounting flange of the exhaust manifold, and the branch pipe of the exhaust manifold was installed so as not to interfere with the axis of the mounting bolts. This separates the exhaust manifold from the engine accessories and prevents the engine accessories from interfering with the exhaust manifold. Together is avoided to protect the engine accessory from heat damage by the heat of the exhaust manifold, also,
A space for mounting the exhaust manifold can be secured, and the mounting operation of the exhaust manifold can be easily performed.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a configuration diagram of an exhaust manifold structure of a V-type engine, FIG. 2 is a configuration diagram of an exhaust manifold, FIG. 3 is a front view of a V-type engine, FIG. 4 is a side view of the V-type engine. 5 to 8 show a conventional exhaust manifold structure, FIG. 5 is a structural view of an exhaust manifold structure, FIG. 6 is a structural view of an exhaust manifold, FIG. 7 is a structural view of an exhaust manifold, FIG. The figure is a front view of the V-type engine. In the figure, 2 is a V-type engine, 4 is a cylinder block, 6 is a cylinder head, 8 is a cylinder head cover,
10 is an oil pan, 12 is an engine bank, 14 is a space, 16
Is an intake manifold, 18 is an alternator, 20 is an exhaust manifold mounting part, 22 is an exhaust manifold, 24 is an air conditioner compressor, 26 is a power steering pump, and 28 is a mounting bolt.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02F 1/24 F02F 1/00 F01N 7/10 F02B 67/00 F02B 75/22

Claims (2)

(57) [Claims] 1. A plurality of engine accessories are disposed below a cylinder block of a V-type engine, and cylinder heads are respectively mounted on the V-shaped upper portion of the cylinder block so as to be inclined outwardly. In the exhaust manifold structure of a V-type engine, an exhaust manifold is mounted on each of the exhaust manifold mounting portions of these cylinder heads.
The exhaust manifold is disposed so as to cover the upper part of the engine accessory by a mounting flange portion and a branch pipe portion of the exhaust manifold, and the mounting of the exhaust manifold is separated so that the exhaust manifold is separated from the engine accessory. The manifold mounting surface of the exhaust manifold mounting portion of the cylinder head corresponding to the flange portion is inclined by a predetermined angle so that a lower portion projects outwardly from an upper portion with respect to an outer inclined surface of the cylinder head. The engine accessory is formed and disposed off the axis of the mounting bolt of the mounting flange portion of the exhaust manifold, and the branch pipe portion of the exhaust manifold is disposed so as not to interfere with the axis of the mounting bolt. An exhaust manifold structure for a V-type engine. 2. The exhaust manifold is disposed in a space below the outer inclined surface of the cylinder head and inside the outer end of the cylinder head. An exhaust manifold structure for a V-type engine according to claim 1.