Cylinder head

Abstract

To provide a cylinder head suppressing manufacturing costs.SOLUTION: A cylinder head includes: an attaching member that separates from a first communication hole if attached to a first attaching hole of a first cylinder head body having a first partition wall portion partitioning two first water jackets, the first communication hole formed on the first partition wall portion to communicate between the two first water jackets, a first opposite wall portion opposed to the first partition wall portion, and the first attaching hole formed on the first opposite wall portion; and a second cylinder head body that has a second partition wall portion partitioning two second water jackets, a second communication hole formed on the second partition wall portion to communicate between the two second water jackets, a second opposite wall portion opposed to the second partition wall portion, and a second attaching hole formed on the second opposite wall portion. In the second communication hole, a tip end of the attaching member attached to the second attaching hole is inserted.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cylinder head. [Background technology]

[0002] In some cases, two water jackets are formed in the cylinder head body, and the two water jackets communicate with each other through a communication hole. Also, a cylinder head is known in which a bolt is attached to a mounting hole formed in the cylinder head body. The tip of the bolt attached to the mounting hole is inserted into the communication hole, and the flow rate of the cooling water flowing between the two water jackets is suppressed (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-216338 A Summary of the Invention [Problem to be solved by the invention]

[0004] Depending on the model, it may be necessary to ensure the flow rate of the cooling water flowing between the two water jackets. When it is necessary to ensure the flow rate, it is possible to attach a bolt shorter than the above-mentioned bolt to the mounting hole and separate the tip of the bolt from the communication hole. If the bolts attached to the cylinder head body differ depending on the model, different types of bolts must be prepared, which may increase the manufacturing cost. In addition, for example, when manufacturing multiple types of cylinder heads on the same production line, the management cost increases because bolts must be managed for each type, which may also increase the manufacturing cost.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a cylinder head whose manufacturing costs can be reduced. [Means for solving the problem]

[0006] The above object is to provide a cylinder head body having a first partition wall portion separating two first water jackets, a first communication hole formed in the first partition wall portion and connecting the two first water jackets to each other, a first opposing wall portion facing the first partition wall portion, and a first mounting hole formed in the first opposing wall portion, a mounting member that is spaced from the first communication hole when attached to the first mounting hole of the first cylinder head body, and a second cylinder head body having a second partition wall portion separating two second water jackets, a second communication hole formed in the second partition wall portion and connecting the two second water jackets to each other, a second opposing wall portion facing the second partition wall portion, and a second mounting hole formed in the second opposing wall portion, wherein a tip of the mounting member attached to the second mounting hole is inserted into the second communication hole. the type of the mounting member that is separated from the first communication hole when attached to the first mounting hole is the same as the type of the mounting member that is attached to the second mounting hole and has a tip inserted into the second communication hole. This can also be achieved by the cylinder head.

[0007] The first partition portion may have a flat first base, and the first communicating hole may be formed by penetrating the first base, and the second partition portion may have a flat second base and a protrusion protruding from the second base toward the second mounting hole, and the second communicating hole may be formed by penetrating the second base and the protrusion. Effect of the Invention

[0008] According to the present invention, it is possible to provide a cylinder head whose manufacturing costs can be suppressed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram of the first cylinder head. [Diagram 2] FIG. 2 is an explanatory diagram of the second cylinder head. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] FIG. 1 is an explanatory diagram of a first cylinder head 20. FIG. 1 illustrates a partial cross section of the first cylinder head 20 in a direction perpendicular to the longitudinal direction of an engine 1 in which a plurality of cylinders 12 are arranged in the longitudinal direction. The engine 1 includes a cylinder block 10 and the first cylinder head 20. Note that FIG. 1 illustrates the external appearance of the cylinder block 10. The first cylinder head 20 includes a first cylinder head body 21 and a bolt 40. The first cylinder head body 21 is fixed to the upper surface of the cylinder block 10.

[0011] Water jackets W11, W12, W21, and W22 through which cooling water flows are formed in the first cylinder head body 21. The water jacket W11 is connected to the water jacket of the cylinder block 10. The water jacket W12 is located on the side of the water jacket W11 and is connected to the water jacket W11. The water jacket W21 is located above the water jacket W11 and is connected to the water jacket W11. The water jacket W22 is located on the side of the water jacket W21 and is connected to the water jacket W21. The water jackets W11 and W21 are examples of first water jackets.

[0012] The cooling water circulated through the engine 1 by the water pump flows from the cylinder block 10 side into the water jacket W11. Part of the cooling water that flows into the water jacket W11 flows into the water jacket W12, and the rest flows into the water jacket W21. The cooling water that flows into the water jacket W21 flows into the water jacket W22. The water jackets W11, W12, W21, and W22 are integrally molded by a core placed in a mold when the first cylinder head body 21 is cast.

[0013] A first partition wall portion 23 is formed between the water jacket W11 and the water jacket W21. The first partition wall portion 23 includes a flat base portion 24. A first communication hole H1 is formed in the base portion 24. The water jacket W11 and the water jacket W21 communicate with each other via the first communication hole H1. A mounting hole H2 is formed in the upper wall portion 22 facing the first partition wall portion 23. The first communication hole H1 and the mounting hole H2 are provided on a common axis A. The first communication hole H1 and the mounting hole H2 are used to discharge a core used during casting of the first cylinder head body 21 and to vent gas. The base portion 24 is an example of a first base portion. The upper wall portion 22 is an example of a first opposing wall portion. The mounting hole H2 is an example of a first mounting hole.

[0014] A bolt 40 made of, for example, metal is attached to the mounting hole H2. The bolt 40 includes a head 41, a large diameter portion 42, and a small diameter portion 43. The head 41 is located at the base end of the bolt 40, and the small diameter portion 43 is located at the tip end of the bolt 40. The large diameter portion 42 has an outer diameter smaller than that of the head 41. The small diameter portion 43 has an outer diameter smaller than that of the large diameter portion 42. A male thread portion is formed on the outer peripheral surface of the large diameter portion 42, and a female thread portion is formed on the inner peripheral surface of the mounting hole H2. The male thread portion of the large diameter portion 42 and the female thread portion of the mounting hole H2 are screwed together, whereby the bolt 40 is attached to the first cylinder head body 21. The bolt 40 is an example of a mounting member.

[0015] Here, the first cylinder head 20 is used when it is required to ensure the flow rate of the cooling water flowing from the water jacket W11 to the water jacket W21. Ensuring such a flow rate of the cooling water is required, for example, when it is required to ensure the cooling performance of the entire first cylinder head 20. Therefore, the bolt 40 attached to the mounting hole H2 faces the first communication hole H1 but is separated from the first communication hole H1. In other words, the tip of the small diameter portion 43 of the bolt 40 is separated from the area surrounded by the inner circumferential surface of the first communication hole H1. Therefore, the bolt 40 does not obstruct the flow of the cooling water flowing through the first communication hole H1, and the flow rate of the cooling water flowing from the water jacket W11 to the water jacket W21 is ensured.

[0016] FIG. 2 is an explanatory diagram of the second cylinder head 20a. FIG. 2 corresponds to FIG. 1. Also, the same components as those of the first cylinder head 20 are denoted by the same reference numerals, and redundant explanations will be omitted. The second cylinder head body 21a of the second cylinder head 20a of the engine 1a is fitted with the same bolts 40 as the bolts 40 described above. In the second cylinder head 20a, the water jackets W11 and W21 separated by the second partition wall portion 23a are an example of a second water jacket. The base portion 24 is an example of a second base portion. The upper wall portion 22 is an example of a second opposing wall portion. The mounting hole H2 is an example of a second mounting hole.

[0017] The second cylinder head 20a is used when it is necessary to suppress the flow rate of the cooling water flowing from the water jacket W11 to the water jacket W21. Such suppression of the flow rate of the cooling water is required, for example, when it is desired to efficiently cool the combustion chamber.

[0018] Unlike the first partition wall 23 of the first cylinder head body 21 described above, the second partition wall 23a includes a protruding portion 25 in addition to the base portion 24. The protruding portion 25 protrudes from the base portion 24 in an annular shape toward the mounting hole H2. The second communication hole H1a formed in the second partition wall 23a is formed to penetrate the base portion 24 and the protruding portion 25. Therefore, the second communication hole H1a is longer in the direction of the axis A than the first communication hole H1. As a result, the tip of the small diameter portion 43 of the bolt 40 is inserted into the second communication hole H1a. Here, the inner diameter of the second communication hole H1a is slightly larger than the outer diameter of the small diameter portion 43, and there is a small gap between the second communication hole H1a and the small diameter portion 43. As a result, in the second cylinder head 20a, the flow rate of the cooling water from the water jacket W11 to the water jacket W21 is smaller and the flow rate of the cooling water from the water jacket W11 to the water jacket W12 is larger than in the first cylinder head 20. In this way, in the second cylinder head 20a, the flow rate of the cooling water flowing from the water jacket W11 to the water jacket W21 is suppressed.

[0019] As described above, the same bolts 40 are used for the first cylinder head 20, which is required to ensure the flow rate of the cooling water flowing from the water jacket W11 to the water jacket W21, and the second cylinder head 20a, which is required to suppress this flow rate. This prevents an increase in the manufacturing costs of the first cylinder head 20 and the second cylinder head 20a. Also, even when the first cylinder head 20 and the second cylinder head 20a and the engines 1 and 1a are manufactured on the same manufacturing line, the same bolts 40 can be used, so that an increase in the management costs of the bolts 40 can be prevented.

[0020] In addition, by simply differentiating the first partition 23 and the second partition 23a, it is possible to manufacture the first cylinder head body 21 for which overall cooling is desired, and the second cylinder head body 21a for which cooling of the fuel chamber side is desired to be prioritized, respectively. This also prevents an increase in the manufacturing costs of the first cylinder head 20 and the second cylinder head 20a.

[0021] In the above embodiment, the bolt 40 has been described as an example of the mounting member, but the present invention is not limited to this and may be, for example, a screw.

[0022] The above engines 1 and 1a have been described as using a common cylinder block 10, but are not limited to this. The first cylinder head 20 and the second cylinder head 20a have been described as having the same configuration except for the first partition wall portion 23 and the second partition wall portion 23a and the first communication hole H1 and the second communication hole H1a, but are not limited to this.

[0023] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0024] 1, 1a engine 20 No. 1 cylinder head 20a Second cylinder head 21 First cylinder head body 21a Second cylinder head body 22 Upper wall portion (first opposing wall portion, second opposing wall portion) 23 1st partition wall 23a Second bulkhead part 24 Base (1st base, 2nd base) 25 Protrusion 40 Bolts (mounting parts) H1 1st communication hole H1a 2nd communication hole H2 Mounting hole (1st mounting hole, 2nd mounting hole) W11, W21 Water Jacket (1st Water Jacket, 2nd Water Jacket)

Claims

1. a first partition wall portion separating two first water jackets, a first communication hole formed in the first partition wall portion and communicating the two first water jackets with each other, a first opposing wall portion facing the first partition wall portion, and a first mounting hole formed in the first opposing wall portion; a mounting member that is spaced from the first communication hole when mounted in the first mounting hole of a first cylinder head body; a second cylinder head body including a second partition wall portion separating two second water jackets, a second communication hole formed in the second partition wall portion and communicating the two second water jackets with each other, a second opposing wall portion facing the second partition wall portion, and a second mounting hole formed in the second opposing wall portion, A tip of the mounting member attached to the second mounting hole is inserted into the second communication hole, a cylinder head, wherein the type of the mounting member that moves away from the first communication hole when attached to the first mounting hole is the same as the type of the mounting member that is attached to the second mounting hole and has a tip inserted into the second communication hole.

2. The first partition portion has a flat first base portion, The first communication hole is formed to penetrate the first base portion, the second partition wall portion has a flat second base portion and a protruding portion protruding from the second base portion toward the second mounting hole, The cylinder head according to claim 1 , wherein the second communication hole is formed penetrating the second base portion and the protruding portion.

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