JPH0134680Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cooling system for a V-type engine, and particularly to the structure of a cylinder head and an intake manifold.

(Prior art) In a conventional water-cooled engine, a radiator is placed on the front or rear side of the engine, and the cooling water coming out of the radiator is sent to the radiator via the cooling water pump, the water jacket of the cylinder block, and the water jacket of the cylinder head. Therefore, the cooling water outlet of the water jacket of the cylinder head must normally be formed at the front or rear end of the cylinder head (see, for example, Japanese Utility Model Publication No. 58-35645).

This is exactly the same for the cylinder heads of both the left and right banks of a V-type engine, and the cooling water outlet openings of the water jackets must be formed at the front or rear ends of both cylinder heads.

Incidentally, although the cylinder heads of both left and right banks of a V-type engine have a mutually rotationally symmetrical structure and are formed in approximately the same shape, due to the above-mentioned restriction on the arrangement of the cooling water outlet opening, they are common parts of the same shape. It was difficult to do so.

(Purpose of the invention) This invention was made in view of the above problems.
It is an object of the present invention to provide a cooling device for a V-type engine which has a simple configuration and can make the cylinder heads of both left and right banks a common part.

(Structure of the invention) The cooling system for the V-type engine of the invention is provided at two locations on the inside of each cylinder head of both left and right banks, at the front end and the rear end with reference to the cylinder arrangement direction, and at the inlet opening of the intake port. In addition to providing a cooling water outlet opening for the water jacket in the cylinder head at a nearby location, the cylinder heads of both banks are formed in the same shape, and one of the cooling water outlet openings of both cylinder heads is located on the front end side or the rear end side. A lid that closes one of the two cooling water outlet openings is integrally formed with the intake manifold that is attached to the cylinder head.

In the above configuration, among the cylinder heads of both left and right banks, the cooling water outlet opening at the front end of one cylinder head and the cooling water outlet opening at the rear end of the other cylinder head are made to correspond rotationally symmetrically. By making the cooling water outlet opening at the rear end of one cylinder head and the cooling water outlet opening at the front end of the other cylinder head rotationally symmetrical, both cylinder heads can be formed into the same shape. It becomes possible.

Additionally, since the four cooling water outlet openings mentioned above are formed near the inlet opening of the intake port, both cooling water outlet openings on the front end side or rear end side that do not need to be connected to the cooling water pipe are connected to the intake manifold. It can be easily closed with the integrated lid.

(Effects of the invention) According to the invention, as explained above, the cylinder heads of both left and right banks can be made into the same shape and can be made into common parts, which reduces the number of parts and significantly reduces design and manufacturing costs. Moreover, the unused cooling water outlet opening can be easily and reliably closed with a simply constructed lid integrally formed with the intake manifold.

In particular, when the joint surfaces of the cooling water outlet opening and the intake port are formed on the same plane, the structure of the lid is further simplified, the gasket can be integrated, and assembly is facilitated.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

This cooling system for a V-type engine shows an embodiment for an OHC type six-cylinder V-type engine.

As shown in FIGS. 1 and 2, the V-type engine 1 has first and second banks 2A and 2B arranged left and right in a V-shape, and the first bank 2A is connected to the second bank 2B. An oil pan is attached to the lower surface of the cylinder block 3 of each bank 2A, 2B, and is composed of the oil pan and the lower part of the cylinder block. A crankshaft 5 extending in the front-rear direction is arranged inside the crankcase.

In the cylinder block 3, the first bank 2A has three even-numbered cylinders 4b, 4d,
4f, three odd-numbered cylinders 4a, 4c, and 4e are formed in the second bank 2B, and a piston fitted in each cylinder 4 is connected to a crankshaft 5 via a connecting rod.

Incidentally, the cylinders 4 of each bank 2A, 2B are as follows:
The three cylinders 4b, 4d, 4f of the first bank 2A are located between the cylinders 4 of the other banks 2A and 2B in the axial direction of the crankshaft 5.
are the three cylinders 4a, 4 of the second bank 2B.
c and 4e are shifted to the rear in the axial direction of the crankshaft 5.

Cylinder heads 6a and 6b, which are hermetically sealed to the upper surfaces of the cylinder blocks 3 of the first and second banks 2A and 2B, have an intake port 8 and an exhaust port 9 corresponding to each cylinder 4 and communicating with the cylinder 4, respectively. are formed in the inner and outer parts of the cylinder heads 6a and 6b, respectively, each intake port 8 has an intake valve that opens and closes the intake port 8, and each exhaust port 9 has an exhaust valve that opens and closes the exhaust port 9. It is provided. Cylinder head covers 7a, 7b covering each cylinder head 6a, 6b and its valve mechanism are attached to each cylinder head 6a, 6b.
It is attached to the upper end of 6b.

Each intake port 8 of both cylinder heads 6a, 6b
An intake manifold 10 for supplying intake air to the cylinder heads 6a and 6b is provided in the space between and above the cylinder heads 6a, 6b, and three intake pipes 1 branch from the left side of the surge tank 11.
2a is curved diagonally sharply downward to the surge tank 11 and is connected to the inlet opening 8a of each intake port 8 of the cylinder head 6a of the first bank 2A, and is connected to three intake ports branched from the right side of the surge tank 11. The pipe 12b curves diagonally and sharply downward of the surge tank 11 and is connected to the inlet opening 8b of each intake port 8 of the cylinder head 6b of the second bank 2B.

In the OHC type six-cylinder V-type engine as described above, the cylinder heads 6a and 6b of both the left and right banks 2A and 2B are configured as follows in order to have the same shape and make them common parts.

Regarding the intake ports 8 and exhaust ports 9 of both the cylinder heads 6a and 6b of the first and second banks 2A and 2B, the second cylinder 4b and the fifth cylinder 4e, the fourth cylinder 4d and the third cylinder 4c, and the sixth cylinder 4f and the first cylinder 4a are in a point-symmetrical positional relationship, so they are formed symmetrically, and the structure for the valve mechanism incorporated in both cylinder heads 6a, 6b is also formed symmetrically.

Furthermore, in order to make the cooling water outlet openings 14 of the water jackets 13 in the cylinder heads 6a, 6b symmetrical, each cylinder head 6a, 6b has a symmetrical structure.
Two cooling water outlet openings 14 are formed at the front end and the rear end of the inner side of the cylinder head 6b, and the cooling water outlet opening 14 is formed at the front end of the cylinder head 6a of the first bank 2A and the cylinder head 6b of the second bank 2B. The cooling water outlet opening 14 at the rear end is symmetrical, and the cooling water outlet opening 14 at the rear end of the cylinder head 6a of the first bank 2A is symmetrical with the cooling water outlet opening 14 at the front end of the cylinder head 6b of the second bank 2B. It is formed as follows.

By the way, only the cooling water outlet openings 14 at the front or rear ends of both the left and right cylinder heads 6a, 6b are connected to the cooling water pipes 15 leading to the radiator (in this embodiment, only the cooling water outlet openings 14 at the front ends are used). ) Therefore, the lid that closes the unused cooling water outlet opening 14 is attached to the intake manifold 1.
Connection flange portion 17 of intake pipes 12a, 12b of 0
is formed integrally with the

That is, the joint surfaces 18 of the inlet openings 8a of the three intake ports 8 of each of the cylinder heads 6a and 6b are formed on the same plane to facilitate connection of the intake manifold 10, and the joint surfaces 18 of the inlet openings 8a of the three intake ports 8 of each of the cylinder heads 6a and 6b are formed on the same plane, and 14 is arranged as close as possible to the inlet openings 8a, 8b of the adjacent intake port 8, and the joint surface 19 of the cooling water outlet opening 14 is flush with the joint surface 18 of the inlet openings 8a, 8b of the intake port 8. is formed.

Then, the cylinder head 6a of the first bank 2A
A lid portion 16 that closes the cooling water outlet opening 14 at the rear end.
is the inlet opening 8 of the intake port 8 of the sixth cylinder 4f.
Connection flange portion 1 of intake pipe 12a connected to a
7 and integrally formed on the same plane, and an integral gasket is also used. Further, the lid part 16 that closes the cooling water outlet opening 14 at the rear end of the cylinder head 6b of the second bank 2B is connected to the connecting flange part 17 of the intake pipe 12b connected to the inlet opening 8b of the intake port 8 of the fifth cylinder 4e. They are integrally formed on the same plane.

Note that the upstream portions of the cooling water pipes 15 connected to the joint surfaces 19 of the cooling water outlet openings 14 at the front ends of the left and right cylinder heads 6a, 6b are integrally connected to the left and right, and are connected to the lower surface of the front portion of the surge tank 11 of the intake manifold 10. Fixed.

Here, in order to prevent air bubbles from accumulating in the water jackets 13 of each cylinder head 6a, 6b and reducing the cooling performance, the cooling water outlet openings 14 are opened from the water jackets 13 as shown in FIG.
The upper wall 20 of the part connected to
The cooling water outlet opening 14 is formed to be inclined further upwards from the outlet portion 13a of the water jacket 13.

According to the configuration of the above embodiment, by providing the cooling water outlet openings 14 at the front and rear ends of both the left and right cylinder heads 6a and 6b, both cylinder heads 6a and 6b are
By making a and 6b the same shape and making them common parts, the design and manufacturing costs can be significantly reduced.

Moreover, each cooling water outlet opening 14 is connected to the intake port 8.
By providing the cooling water outlet opening 14 which is not used in the vicinity of the inlet openings 8a, 8b of the intake manifold 10, and by forming its joint surface 19 on the same plane as the joint surface 18 of the inlet openings 8a, 8b of the intake port 8. The intake pipes 12a and 12b can be easily closed with a lid 16 integrally formed with the connecting flange 17 of the intake pipes 12a and 12b.

However, the joint surface 19 of the cooling water outlet opening 14 does not necessarily have to be formed on the same plane as the joint surface 18 of the inlet openings 8a, 8b of the intake port 8.

It goes without saying that the V-type engine is not limited to a six-cylinder engine, but can also be applied to engines with various numbers of cylinders.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a partially cutaway main part of a V-type engine, FIG. 2 is a schematic end view of the cylinder head itself, and FIG. The figure is a side view of the intake manifold. 2A, 2B...Bank, 6a, 6b...Cylinder head, 8...Intake port, 8a, 8b...8
Inlet opening, 10...Intake manifold,
13... Water jacket, 14... Cooling water outlet opening, 16... Lid.

Claims (1)

[Scope of utility model registration request] On the inside of each cylinder head of both left and right banks, there are two cylinders located at the front end and the rear end with reference to the cylinder arrangement direction.
In addition to providing a cooling water outlet opening for the water jacket in the cylinder head at a location close to the inlet opening of the intake port, the cylinder heads of both banks are formed in the same shape, and one of the cooling water outlet openings of both cylinder heads is provided. A cooling device for a V-type engine, characterized in that a lid portion for closing both cooling water outlet openings on either the front end side or the rear end side is integrally formed with an intake manifold attached to a cylinder head.