JP2581078Y2 - Cylinder head cooling water passage structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water passage structure for a cylinder head, and more particularly to a cooling water passage structure for a cylinder head in which a cooling water passage on an intake side and a cooling water passage on an exhaust side are formed separately from each other. Things.

[0002]

2. Description of the Related Art In recent years, as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 2-63052, cooling water from a radiator is supplied to a cylinder head in order to increase cooling efficiency with respect to intake air and improve intake volume efficiency. A cooling water passage structure in which the water is supplied to the cooling water passage of the cylinder block by a water pump after passing through the cooling water passage on the side, and the cooling water passage of the cylinder block returns to the radiator through the cooling water passage on the exhaust side of the cylinder head. Has been proposed.

In the cylinder head 31 having such a cooling water passage structure, as shown in FIG. 7, a cooling water passage 32 on the intake side and a cooling water passage 33 on the exhaust side are separated from each other except for a thermostat arrangement portion 34. Have been. The thermostat is provided to circulate the cooling water without passing through the radiator when the temperature of the cooling water is low. Therefore, in the thermostat arrangement portion 34, the end 33a of the cooling water passage 33 on the exhaust side and the cooling on the intake side are provided. An inlet portion 32a of the water passage 32 is communicated through a communication hole 36 formed in the partition wall 35, and the communication hole 36 is configured to be opened and closed by a thermostat (not shown).

The cooling water passages 32 and 33 on the intake side and the exhaust side which are separated from each other as shown in FIGS.
An intake-side cooling water passage forming core 42 and an exhaust-side cooling water passage forming core 43 which are independent from each other are used.
The cylinder heads 2 and 43 are respectively set in a mold for forming a cylinder head, and the cylinder head 31 is formed by casting. 8 and 9, 43, 44, 4
Reference numerals 5 and 46 denote skirting boards for supporting the respective cores 42 and 43 on the mold. As shown in FIG. 7, the part of the baseboard 43 is provided at the inlet 37 of the cooling water from the radiator, and the baseboard 46 is provided.
Part becomes the outlet 38 to the radiator, and the part of the baseboard 45 is closed with the blind plug 39.

[0005]

However, since the cores 42 and 43 need to be manufactured to form the cooling water passages 32 and 33 which are separated from each other as described above, the core manufacturing equipment is required. Extra casting is required, and a plurality of cores 42 and 43 need to be separately set in the mold, which increases the number of man-hours for assembling the mold.

In view of such a conventional problem, the present invention provides a cylinder head cooling system which can manufacture a cylinder head in which a cooling water passage on the intake side and a cooling water passage on the exhaust side are formed separately from each other. An object is to provide a water passage structure.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a cooling water passage structure for a cylinder head in which a cooling water passage on an intake side and a cooling water passage on an exhaust side are formed separately from each other. At least one end of the cooling water passage on the side is formed so as to communicate with each other, and the communication portion is blocked by a pipe that communicates one of the cooling water passages with the outside.

[0008]

According to the present invention, since the cooling water passages on the intake side and the exhaust side are formed with at least one end thereof communicating with each other, the cores forming both cooling water passages can be integrated. It is possible to greatly reduce the manufacturing cost of the core as compared with the case where separate cores are used, to reduce the cost of casting, and to use a pipe that communicates one of the cooling water passages with the outside. Since the communication part of the cooling water passage is shut off, it can be used as a blind plug and an outlet, and the cooling water passage can be separated with a simple configuration, and the cooling water passage on the intake side and the cooling water passage on the exhaust side are separated from each other. Thus, the cylinder head formed as a whole can be manufactured at low cost.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example of the principle configuration of the present invention will be described with reference to FIGS. 1 and 2. 1 is a cylinder head, 2 is a cooling water passage on an intake side, and 3 is a cooling water passage on an exhaust side. It is. The cylinder head 1 is cast in a state where one ends of both cooling water passages 2 and 3 are communicated with each other via a communication portion 4. The cooling water passages 2 and 3 are separated from each other by cutting off the communication portion 4 by a pipe 5 that communicates one end of the cooling water passage 3 on the exhaust side to the outside.

Next, a specific embodiment of the present invention will be described with reference to FIGS. 3 and 4, an intake-side cooling water passage 2 is provided on the intake port 6 side of the cylinder head 1, and an exhaust-side cooling water passage 3 is provided on the exhaust port 7 side. At the inlet end 2a of the intake-side cooling water passage 2 located at one end of the cylinder head 1, a cooling water inlet 12 and a thermostat 13 connected to the outlet of the radiator are arranged, and the outlet end 2b of the intake-side cooling water passage 2 is A connection port 8 protruding from the other end of the cylinder head 1 and connected to a suction port of a water pump disposed in the cylinder block 9 is opened downward. The exhaust-side cooling water passage 3 is connected to a cooling water passage 10 formed in the cylinder block 9 via a communication port 11 on the lower surface of the cylinder head 1.
“a” communicates with the thermostat 13, and the other end 3 b communicates with the pipe 5 constituting the cooling water outlet 19 connected to the inlet of the radiator.

In the casting state of the cylinder head 1, the inlet end 2 a of the intake-side cooling water passage 2 and the one end 3 a of the exhaust-side cooling water passage 3 communicate with each other through a large-diameter communication hole 14.
A hole is formed in the communication hole 14 to form a stepped hole 15. A bowl-shaped plug 16 having a bypass passage hole 17 is press-fitted into the stepped hole 15, and the valve of the thermostat 13 is inserted into the bowl-shaped plug 16. The seat is configured.

At the other end of the cylinder head 1, the outlet end 2 b of the intake-side cooling water passage 2 and the other end 3 b of the exhaust-side cooling water passage 3 communicate with each other when the cylinder head 1 is in a casting state.
And an exhaust side cooling water passage forming core, which will be described later, and are communicated with each other through a through hole 18 formed by a skirting board. Then, a hole is formed in the through hole 18 from the other end surface of the cylinder head 1, and the pipe 5 forming the cooling water outlet is formed in the through hole 18.
By press-fitting, the communication portion 4 is cut off and closed by the pipe 5, and the intake-side cooling water passage 2 and the exhaust-side cooling water passage 3 are separated.

At the time of casting the cylinder head 1 as described above, a core 21 as shown in FIG. 5 is used to form the intake side cooling water passage 2 and the exhaust side cooling water passage 3.
The core 21 has one end of an intake-side cooling water passage forming core 22 and one end of an exhaust-side cooling water passage forming core 23 connected by a connecting portion 24 corresponding to the communication hole 14. The other ends of the service core 22 and the exhaust-side cooling water passage forming core 23 are connected by a connecting portion 25 corresponding to the communication portion 4.
2 and 23 are integrated. Reference numerals 26 and 27 denote skirting boards formed at one end and the vicinity of the other end of the intake-side cooling water passage forming core 22, and reference numeral 29 denotes a skirting board formed at the other end of the exhaust-side cooling water passage forming core 23. And the connecting portion 25 is connected to the baseboard 29. The core 21 is set in the mold by supporting these skirting boards 26, 27, 29 in the mold of the cylinder head 1, and the casting is performed so that the intake side cooling water passage 2 and the exhaust side cooling water passage 3 The cylinder heads 1 communicating with each other at the communication section 4 are formed.

Thereafter, as described above, the communication hole 14 formed by the connecting portion 24 and the through hole 18 formed by the skirting board 29 are subjected to hole processing.
As shown in FIG. 3, the cylinder head 1 in which the intake-side cooling water passage 2 and the exhaust-side cooling water passage 3 are separated is obtained.

As described above, according to the present embodiment, the core 21 having the cores 22 and 23 integrated therein is used to form the cooling water passages 2 and 3 separated on the intake side and the exhaust side. Therefore, the production cost of the core can be greatly reduced as compared with the case where separate cores are used, and the casting cost can be reduced. or,
The cooling water passages 2 and 3 are separated by press-fitting the bowl-shaped plug 16 and the tube body 5 into the cylinder head 1 thus cast by simple drilling, so that the cooling water passage 2 on the intake side is formed. The cylinder head 1 in which the cooling water passage 3 on the exhaust side and the exhaust side are formed separately from each other can be manufactured at low cost as a whole.

In the above embodiment, one end of the intake-side cooling water passage forming core 22 and one end of the exhaust-side cooling water passage forming core 23 are connected to the communication hole 13 in the thermostat 7 arrangement portion.
FIG. 6 shows an example of connection at the connection portion 24 corresponding to FIG.
As shown in the figure, a skirting board 28 is provided at one end of the exhaust-side cooling water passage forming core 23, and the intake-side cooling water passage forming core 22 is provided.
A skirting board 26 and a skirting board 28 at one end are connected by a connecting portion 30 to form a partition wall similar to the conventional example between one end 2a and 3a of the intake-side cooling water passage 2 and the exhaust-side cooling water passage 3. May be formed, and the valve seat of the thermostat 7 may be machined on this partition wall to close the opening formed in the baseboard 28. By doing so, the thermostat arrangement portion can be made compact.

[0017]

According to the cooling water passage structure of the cylinder head of the present invention, the cooling water passages on the intake side and the exhaust side are formed by connecting at least one ends thereof to each other as described above. A tube that can integrate the core that forms the cooling water passage, can significantly reduce the manufacturing cost of the core, can lower the casting cost, and communicates either cooling water passage with the outside. Since the communication part of both cooling water passages is shut off, the blind water can be used as a blind plug and an outlet, and the cooling water passage can be separated with a simple configuration, and the cooling water passage on the intake side and the cooling water passage on the exhaust side are separated. The cylinder heads formed separately from each other can be manufactured at low cost as a whole.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a principle configuration example of a cooling water passage structure of a cylinder head according to the present invention.

FIG. 2 is a sectional view taken on line II of FIG. 1;

FIG. 3 is a cross-sectional plan view of a main part of one embodiment of the cooling water passage structure of the cylinder head according to the present invention;

FIG. 4 is a schematic vertical sectional side view of a cylinder head.

FIG. 5 is a plan view of a main part of a cooling water passage forming core used in the embodiment.

FIG. 6 is a plan view of a main part of a cooling water passage forming core used in another embodiment of the present invention.

FIG. 7 is a cross-sectional plan view of a main part of a cooling water passage structure of a conventional cylinder head.

FIG. 8 is a perspective view of a cooling water passage forming core used in a conventional example.

FIG. 9 is a plan view of a main part of a cooling water passage forming core used in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Intake side cooling water passage 3 Exhaust side cooling water passage 4 Communication part 5 Tube

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02F 1/40 F01P 3/02 F02F 1/36 F02F 1/24

Claims (1)

(57) [Scope of request for utility model registration] 1. A cooling water passage structure for a cylinder head in which a cooling water passage on an intake side and a cooling water passage on an exhaust side are formed separately from each other, wherein at least one end of the cooling water passage on the intake side and the exhaust side. A cooling water passage structure for a cylinder head, wherein the cooling water passage structure is formed by connecting the cooling water passages to one of the cooling water passages and the outside thereof.