JPH04219449A - Cylinder head of engine and its manufacture - Google Patents

Abstract

PURPOSE:To downsize a cylinder head and reduce the weight without increasing the size of cores for forming water jackets and also increasing the number of steps for casting. CONSTITUTION:A cylinder head main body 14 is formed of an integral casting 18 in which multiple jacket chamber 16A are provided. These jacket chambers 16A are connected to each other through connecting holes 20a, etc., formed by cutting off partitions 20, mounting plugs 22, etc.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cylinder head and a method of manufacturing the same.

0002

BACKGROUND OF THE INVENTION A cylinder head of an engine consists of a cylinder head body mounted on a cylinder block. This cylinder head body has a water jacket inside, and cooling water flows through the water jacket. Cooling the cylinder head.

[0003] If the cylinder head is a one-piece body with a length and width corresponding to the length of the cylinder block, the space for the water jacket inside the cylinder head will be large, so the core used when casting the cylinder head is becomes large, resulting in insufficient mechanical strength and difficulty in casting.

For this reason, in the cylinder head of the prior art, in order to be able to form a water jacket with a small core, the cylinder head is divided into a plurality of head divisions in the length direction of the cylinder block. The water jackets of the matching head division bodies are connected by coolant pipes to allow cooling water to flow through them.

[0005]

[Problems to be Solved by the Invention] However, this prior art requires a large number of casting processes, which makes manufacturing the cylinder head troublesome and has low workability.In addition, it is difficult to assemble a plurality of divided bodies and attach them to each other. Since it is attached with bolts, the overall weight of the cylinder head increases, and the length of the divided bodies when assembled together increases, resulting in an increase in the size of the cylinder head.

An object of the present invention is to avoid the above-mentioned drawbacks, to be able to manufacture the product without increasing the number of casting steps, to reduce the weight and size, and to have a relatively small shape and a large size. An object of the present invention is to provide an engine cylinder head that can be manufactured using a core having mechanical strength, and a method for manufacturing the same.

[0007]

[Means for Solving the Problems] One of the means for solving the problems of the present invention consists of a cylinder head body mounted on a cylinder block, and this cylinder head body has a water jacket inside. The head body is made of one piece,
Another object of the present invention is to provide a cylinder head for an engine in which the water jacket is composed of a plurality of jacket chambers partitioned by partition walls and a communication hole formed in the partition wall and communicating the adjacent jacket chambers.

[0008] Another problem-solving means of the present invention is a cylinder head for an engine, which comprises a cylinder head body mounted on a cylinder block, and which has a water jacket inside, the cylinder head body being made of an integrally cast material. A cylinder head for an engine, characterized in that the water jacket is composed of a plurality of jacket chambers partitioned by a plurality of partition walls, and a communication pipe installed across the partition walls and communicating between adjacent jacket chambers. Our goal is to provide the following.

[0009] Still another problem-solving means of the present invention comprises a cylinder head body mounted on a cylinder block, and in a method for manufacturing an engine cylinder head having a water jacket inside. The main body is cast as a monolithic body having a plurality of closed jacket chambers partitioned by a plurality of partition walls, and this monolithic casting is cut into a T-shape spanning one plate wall and the partition wall, and a section adjacent to the partition wall is formed. An object of the present invention is to provide a method for manufacturing an engine cylinder head, which is characterized in that a communication hole is formed to communicate matching jacket chambers, and then the cut-off plate wall is plugged.

0010

[Function] As the cylinder head body is integrally cast, it can be manufactured in one casting process, and since the core is formed for each of multiple jacket chambers, it can be small and its mechanical strength is high. , casting is easy, and the jacket chambers can be communicated with each other through a connecting pipe that spans the partition wall or a communication hole that is easily formed by simple processing such as cutting off the partition wall, so that adjacent jacket chambers can be easily connected. It's easy. Furthermore, since the cylinder head body is integrated,
Compared to the conventional case where divided bodies are brought together, the wall thickness of adjacent jacket chambers is smaller, making it possible to reduce the overall size and weight.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cylinder head 10 according to the present invention. 14, and this cylinder head body 14 has a water jacket 16 inside.

As shown in the figure, the cylinder head body 14 is made of a monolithic casting 18, and includes a water jacket 1.
6 consists of a plurality of jacket chambers 16A partitioned by a plurality of partition walls 20, and communication holes 20a formed in these partition walls 20 and communicating the adjacent jacket chambers 16A. This cylinder head 10 can be manufactured as shown in FIGS. 2 to 4.

First, as shown in FIG. 2, the cylinder head body 14 is cast as an integral casting 18 having a plurality of closed jacket chambers 16A partitioned by a plurality of partition walls 20. Thereafter, as shown in FIG.
A communication hole 20 is cut in a T-shape across the partition wall 20 and the partition wall 20 to communicate the jacket chamber 16A adjacent to the partition wall 20.
form a. Finally, as shown in FIG. 4, this cut-off plate wall 18A is plugged with a plug 22. This plug 2
2 can be attached by welding or other appropriate means.

In FIG. 1, reference numeral 26 indicates a thermostat that communicates with the water jacket 16 and detects the temperature of the cooling water.

FIGS. 5 and 6 show another embodiment of the present invention, which includes a cylinder head body 14 made of a monolithic casting 18 as shown in FIG. It has a plurality of jacket chambers 16A divided by 20, but these adjacent jacket chambers 1
6A is a communication pipe 28 installed across this partition wall 20.
communicated by.

[0016] In this way, the cylinder head main body 14 is
Although it is a monolithic casting and is manufactured in one casting process, the core used during this casting is formed for each of multiple jacket chambers, so it can be small and its mechanical strength can be increased. Casting is easily performed. Further, the jacket chamber 16A can be easily communicated with through a communication hole 20a that is easily formed by a simple process such as cutting off the partition wall 20, or through a communication pipe 28 that is attached to the outside across the partition wall 20. Furthermore, if the cylinder head body 14 is made of an integral casting, the thickness between adjacent jacket chambers will be smaller than in the conventional case where divided bodies are brought together, so the overall size and weight can be reduced. can.

[0017]

Effects of the Invention According to the present invention, as described above, the cylinder head body is manufactured in one casting process, so there are fewer casting processes, and the core is formed in each of a plurality of jacket chambers, so it is small. The jacket chamber can be easily communicated with through a communicating hole or an external communicating pipe that can be easily formed by simple processing such as cutting off the partition wall, In addition, there is a practical advantage that the overall size and weight can be reduced compared to a collection of divided bodies.

[Brief explanation of the drawing]

FIG. 1 is a side view of a cylinder head according to the present invention.

FIG. 2 is a sectional view of a main part showing the first step of the method for manufacturing a cylinder head of the present invention.

FIG. 3 is a sectional view of a main part showing the first step of the method for manufacturing a cylinder head of the present invention.

FIG. 4 is a sectional view of a main part showing the first step of the method for manufacturing a cylinder head of the present invention.

FIG. 5 is a top view of a cylinder head according to another embodiment of the invention.

FIG. 6 is a side view of the cylinder head of FIG. 5;

[Explanation of symbols]

10 Cylinder head 12 Cylinder block 14 Cylinder head body 16 Water jacket 18 Monolithic casting 20 Partition wall 20a Communication hole 2 Plug 26 Drill

Claims (3)

[Claims] 1. A cylinder head for an engine consisting of a cylinder head body mounted on a cylinder block, the cylinder head body having a water jacket inside, wherein the cylinder head body is made of an integral casting, and the water jacket has a water jacket inside. 1. A cylinder head for an engine, comprising a plurality of jacket chambers partitioned by a plurality of partition walls, and a communication hole formed in the partition wall and communicating the adjacent jacket chambers. 2. A cylinder head for an engine comprising a cylinder head body mounted on a cylinder block, the cylinder head body having a water jacket inside, wherein the cylinder head body is made of an integral casting, and the cylinder head body has a water jacket inside. An engine cylinder head comprising a plurality of jacket chambers partitioned by a plurality of partition walls and a communication pipe installed across the partition walls and communicating the adjacent jacket chambers. 3. A method for manufacturing an engine cylinder head comprising a cylinder head body mounted on a cylinder block, the cylinder head body having a water jacket inside, the cylinder head body being partitioned by a plurality of partition walls. The integral casting is cast as an integral casting having a plurality of closed jacket chambers, and the integral casting is cut into a T-shape spanning one of the plate walls and the partition wall to communicate the jacket chambers adjacent to the partition wall. A method for manufacturing an engine cylinder head, comprising forming a hole and then plugging the cut-off plate wall with a plug.