JPH0247219Y2 - - 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 at the front or rear side of the engine in the cylinder arrangement direction, and the cooling water discharged from the radiator is sent to the cooling water pump, the water jacket of the cylinder block, and the water jacket of the cylinder head. The cooling water outlet of the cylinder head water jacket is
Usually, it is necessary to form it 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 left and right bank cylinder heads of a V-type engine.
The cooling water outlet of the water jacket must be formed at the front or rear end of both cylinder heads.

(Problem to be solved by the invention) Incidentally, the cylinder heads of both the left and right banks of a V-type engine have mutually rotationally symmetrical structures and are formed into approximately the same shape. Currently, due to layout constraints, common parts of the same shape are not used.

On the other hand, engine cooling water is used relatively far away from the engine body, for example, to heat the throttle body to prevent icing, or to detect engine temperature to adjust the intake air amount according to the cooling water temperature during idling. There are cases where it is required to supply cooling water to engine auxiliary equipment located at a certain location, and the problem is how to take out the cooling water for this purpose.

Therefore, the purpose of the present invention is to improve the cooling water outlet so that the cylinder heads of both the left and right banks can be made into a common part with a simple configuration, and also to make it possible to make the cylinder heads of both the left and right banks a common part. To provide a cooling device for a V-type engine which allows extraction with a simple configuration.

(Means and actions for solving the problem) In order to achieve the above-mentioned object, the present invention basically has a structure in which the inner side of each cylinder head in both the left and right banks is By forming a cooling water outlet at each end, the restriction imposed by the cooling water outlet can be eliminated and the left and right cylinder heads can be used in common. Then, the pair of cooling water outlets at one end in the cylinder arrangement direction are closed by a lid formed on the intake manifold, and only the pair of cooling water outlets at the other end are connected to the radiator as before. It is designed so that it can be used as the main reflux to.

Further, an auxiliary cooling water extraction pipe for the throttle body and the like is connected to either one of the lids.

Specifically, the configuration is as follows. That is, the cylinder heads of both the left and right banks are made common to each other, and the cylinder heads are formed in two places on the inner side of each cylinder head, at one end and the other end in the cylinder arrangement direction. A cooling water outlet of the water jacket is opened, and a pair of cooling water outlets located at one end of each of the left and right cylinder heads are connected to a radiator, respectively, to cool the left and right cylinder heads. After the water exit,
A pair of cooling water outlets, each located at the other end,
Each of the intake manifolds is closed by a lid formed on the intake manifold, and an auxiliary cooling water extraction pipe is connected to one of the lids.

(Example) Hereinafter, an example of the present invention applied to an OHC type V-type 6-cylinder engine will be described based on the attached drawings.

The V-type engine 1 has first and second banks 2A and 2B arranged left and right in a V-shape, as shown in FIGS. 1 and 2, 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 3. 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 intake ports 8 and exhaust ports 9 corresponding to each cylinder 4 and communicating with the cylinders 4, respectively. are formed in the inner and outer portions of the cylinder heads 6A, 6B, respectively, and each intake port 8 is provided with an intake valve for opening and closing it, and each exhaust port 9 is provided with an exhaust valve for opening and closing it. Cylinder head covers 7A, 7 cover each cylinder head 6A, 6B and its valve mechanism.
B is attached to the upper end of each cylinder head 6A, 6B.

Each intake port 8 of both cylinder heads 6A, 6B
Intake manifold 1 for supplying intake air to
0 is provided in the space between the two cylinder heads 6A, 6B and the space above it, and three intake pipes 1 are branched from the left side of the surge tank 11.
2A is curved diagonally and sharply downward of 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. In addition, 3 branched from the right side of the surge tank 11
The main intake pipe 12B curves diagonally and sharply downwards 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 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. That is, the first
and both cylinder heads 6 of the second banks 2A and 2B.
Regarding the intake ports 8 and exhaust ports 9 of A and 6B, 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 located at point-symmetrical positions. Because of their relationship, they are formed symmetrically, and the structure for the valve mechanism incorporated in both cylinder heads 6A, 6B is also formed symmetrically. Furthermore, the water jackets 1 in the cylinder heads 6A, 6B
In order to have a symmetrical structure, the cooling water outlet 14 of No. 3 is also formed at two locations, at the front end and the rear end in the cylinder arrangement direction on the inside of each cylinder head 6A, 6B. The cooling water outlet 14 at the front end of the cylinder head 6A of the first bank 2A and the cooling water outlet 14 at the rear end of the cylinder head 6B of the second bank 2B are connected to the cooling water outlet 14 at the rear end of the cylinder head 6A of the first bank 2A. cylinder head 6
It is formed so that it is symmetrical with the cooling water outlet 14 at the front end of B.

By the way, only the cooling water outlet 14 at either the front end or the rear end of both the left and right cylinder heads 6A, 6B is connected to the cooling water return pipe 15 leading to the radiator 21 (in this embodiment, the cooling water outlet at the front end is connected to the cooling water return pipe 15 leading to the radiator 21). 14), so as shown in Figure 3,
Lid part 1 that closes the cooling water outlet 14 that is not used
6 is the intake pipe 12 of the intake manifold 10
It is integrally formed on the connecting flange portions 17 of A and 12B.

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

Then, the cylinder head 6A of the first bank 2A
The lid portion 16 that closes the cooling water outlet 14 at the rear end of the
Inlet opening 8a of intake port 8 of sixth cylinder 4f
Connection flange portion 17 of intake pipe 12a connected to
A gasket (not shown) that is integrally formed on the same plane as the gasket is also used. Also the second
A cover 16 that closes the cooling water outlet 14 at the rear end of the cylinder head 6B of the bank 2B is connected to the fifth cylinder 4.
The connecting flange portion 17 of the intake pipe 12b connected to the inlet opening 8b of the intake port 8 of e is integrally formed in the same plane as the connecting flange portion 17 of the intake pipe 12b.

Note that the upstream portions of the cooling water pipes 15 connected to the joint surfaces 19 of the cooling water outlets 14 at the front ends of the left and right cylinder heads 6A, 6B are integrally connected on the left and right sides and fixed to the front lower surface of the surge tank 11. . In addition, 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 water jackets 13 are connected to each cooling water outlet 14 as shown in FIG. The upper wall 20 of the water jacket 13 is inclined 2 to 4 degrees from the horizontal plane so that it is higher on the downstream side, and the cooling water outlet 14 is inclined further upward from the outlet 13a of the water jacket 13. It is formed.

Here, regarding the cooling water system of engine 1, the fourth
To explain with a diagram, from the radiator 21 to the pump 2
2, the cooling water is pumped through the left and right branch pipes 28A,
After being supplied to the cylinder blocks 3 in the left and right banks via 28B, it ascends within this cylinder block 3 and is supplied to (the water jackets 13 of) each cylinder head 6A, 6B. After cooling the left and right cylinder heads 6A, 6B, the cooling water passes through the aforementioned cooling water return pipe 15 from a pair of cooling water outlets 14 located at the front ends, respectively.
It is returned to the radiator 21.

On the other hand, the above-mentioned intake manifold 10
Among the left and right lid portions 16, one of the lid portions 16 has a
As shown in FIG. 5, an auxiliary cooling water outlet 23 is opened (the other lid part 16 does not have an outlet 23 formed therein). For this outlet 23,
The upstream end of the auxiliary cooling water pipe 25 is connected to the connection pipe 24 screwed to the outlet 23, and the downstream end of the pipe 25 is connected to the cooling water return pipe 15.
connected in the middle. A throttle body 26 and an idling intake air amount adjustment mechanism 27 (thermal valve thereof) are connected in the middle of the pipe 25. As a result, the throttle body 6 is heated by the cooling water and icing is prevented, and the amount of intake air is corrected to an optimum value according to the temperature of the cooling water. In addition, the above piping 25
The effective opening area of the cooling water return pipe 15 is set to be sufficiently smaller than that of the cooling water return pipe 15.

Although the embodiments have been described above, engine ancillary equipment that utilizes the cooling water from the auxiliary cooling water outlet 23 may be any suitable equipment such as a carburetor to prevent icing. Of course, the number of cylinders of the engine 1 is not limited to six cylinders, but may be any suitable number.

(Effects of the invention) As is clear from the above, the invention has the following effects:
Of the cooling water outlets formed at each end of the cylinder head in the cylinder arrangement direction, each unnecessary cooling water outlet at one end is closed by a lid formed in the intake manifold, which is extremely simple. With this configuration, there is no restriction on the opening position of the cooling water outlet, and each cylinder head in both the left and right banks can be shared, which is extremely advantageous in terms of manufacturing and cost.

In addition, since the auxiliary cooling water for the engine ancillary equipment such as the throttle body is taken out from the lid, the configuration for taking out this auxiliary cooling water is simple.
Since it is located on the opposite side in the cylinder arrangement direction from the piping for returning cooling water to the radiator, the arrangement of the piping for taking out the auxiliary cooling water is also easy.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-away longitudinal sectional front view of the essential parts of a V-type engine showing an embodiment of the present invention. FIG. 2 is a schematic end view of the cylinder head itself taken along the line of FIG. 1; Figure 3 is a side view of the intake manifold.
FIG. 4 is a system diagram showing the engine cooling water system. Fifth
The figure is a cross-sectional view of the auxiliary cooling water extraction portion relative to the lid. 1: V-type engine, 2A, 2B: Bank, 3:
Cylinder block, 4, 4a to 4f: cylinder,
5: Crankshaft, 6A, 6B: Cylinder head, 8: Intake port, 10: Intake manifold, 13: Water jacket, 13a: Outlet section, 14: Cooling water outlet, 15: Cooling water return pipe, 1
6: Lid, 17: Connection flange, 21: Radiator, 22: Pump, 23: Auxiliary cooling water outlet,
24: Connection pipe, 25: Auxiliary cooling water piping, 2
6: Throttle body, 27: Intake air amount adjustment mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] The cylinder heads of both left and right banks are made common to each other, and each cylinder head is provided at two locations on the inner side of each cylinder head at one end and the other end in the cylinder arrangement direction. A cooling water outlet of a water jacket formed in the cylinder head is opened, and a pair of cooling water outlets located at one end of each of the left and right cylinder heads are connected to the radiator, respectively. Of the cooling water outlets of both the left and right cylinder heads, a pair of cooling water outlets located at the other end are respectively closed by lids formed on the intake manifold, and either one of the lids has a A cooling device for a V-type engine, characterized in that: , an auxiliary cooling water extraction pipe is connected thereto.