JPH04109448U - Diesel engine cylinder head - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a diesel engine cylinder head that is lightweight, durable, and reliable. [Configuration] The cylinder head consists of a cast iron cylinder head body with an intake port and an exhaust port inside, a camshaft bracket that pivotally supports the valve drive camshaft, and a tappet hole into which the tappet is slidably fitted. It consists of a light metal tappet block. By making the cylinder head body from cast iron and the tappet block from aluminum alloy, it is possible to ensure durability while reducing weight.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a cylinder head of an engine, particularly a diesel engine for a vehicle. It is something.

0002

[Conventional technology]

Conventional truck diesel engine cylinder heads have high temperature strength and durability. Because they are usually made of cast iron, they are heavy and there is a need to make them lighter. . In addition, if the above engine is an OHC type engine, the cylinder head has an intake valve. An intake port with an exhaust valve, an exhaust port with an exhaust valve, the above intake port and exhaust port A support structure for a valve train camshaft that includes a cooling water chamber, an intake cam, and an exhaust cam, and sliding contact with the intake cam and exhaust cam to transmit the cam lift to the above intake valve and exhaust valve. The structure is extremely complicated due to the tappet hole, etc. that accommodates the tappet. There is a problem in that casting defects are likely to occur.

0003

[Problem that the idea aims to solve]

Compared to the conventional cast iron cylinder head mentioned above, this invention does not impair durability. A device that can achieve weight reduction without any problems, is easy to cast, and has fewer casting defects. We provide cylinder heads for diesel engines, especially OHC diesel engines. The purpose is to

0004

[Means to solve the problem]

This invention was devised to achieve the above purpose, and is installed in the crankcase. A cast iron series with an intake valve and an intake port and an exhaust valve and an exhaust port. mounted on the cylinder head body and the cylinder head body, and the above-mentioned intake valve and exhaust valve A camshaft bracket that pivotally supports a camshaft equipped with an intake cam and an exhaust cam that opens and closes. , an intake tappet interposed between the intake cam and exhaust cam and the intake valve and exhaust valve; made of light alloy and equipped with a tappet hole into which an exhaust tappet and an exhaust tappet are slidably fitted. A diesel engine cylinder characterized by being equipped with a tappet block This is a proposal for dahead.

[0005]

[Effect]

According to the present invention, the cylinder head is mounted on the crankcase and has an intake air inside. A cast iron cylinder head body with ports and exhaust ports; A camshaft bracket that is mounted on the main body and supports a camshaft that includes an intake cam and an exhaust cam. A light alloy having tappet holes for accommodating an intake tappet and an exhaust tappet. The entire cylinder head is made of cast iron. The weight is reduced compared to conventional cylinder heads. Also, the cylinder head The cylinder head body and tappet block are manufactured separately, so they can be made in one piece. Compared to conventional cylinder heads, casting is easier and fewer casting defects occur.

[0006]

【Example】

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The code 10 in the figure is A general view of the cylinder head of an OHC type diesel engine for racks, and The cylinder head 10 is a cast iron cylinder mounted on the upper end surface of a crankcase (not shown). A cylinder head body 12 and a light joint mounted on the upper end surface of the cylinder head body 12. The tappet block 14 is made of gold, for example, an aluminum alloy. the above The cylinder head body 12 is manufactured by a conventional cast iron casting method, and the cylinder head body 12 is manufactured by a conventional cast iron casting method. The lock 14 is formed by a suitable casting method such as die casting, pressure casting or gravity casting. Manufactured.

[0007] The cylinder head main body 12 has a plurality of cylinders as shown in FIG. Intake port 16, exhaust port 18 and and a cooling water chamber 20 that surrounds these ports, and a chain that drives a valve train camshaft, which will be described later. and a cavity 22 for accommodating a horn. Above intake port 16 and exhaust port 1 Pipe-shaped valve guides 24 and 26 are disposed facing the valve guide 8, respectively. The valve stem (not shown) of the intake valve is in the guide 24, and the valve stem (not shown) of the intake valve is in the valve guide 26. Valve stems (not shown) of the valves are respectively slidably fitted. In addition, the above valve gas An intake valve and an exhaust valve are provided on the upper surface of the cylinder body 12 surrounding the upper ends of the cylinders 24 and 26, respectively. An annular groove 30 for inserting the lower end of the valve spring that biases the air valve in the closing direction is concentrically recessed. (In Figure 1, the leftmost cylinder is (only those shown). On the other hand, the tappet block 14 has valve stem top surfaces of the intake valve and exhaust valve. The bottomed cylindrical intake tappet and exhaust tappet (not shown) that come into contact with the Tappet holes 32 and 34 are provided, into which the intake valve and exhaust valve can be fitted freely. Journal of a valve train camshaft (not shown) equipped with an intake cam and an exhaust cam that drive the A plurality of (five in this embodiment) camshaft brackets 36 are provided to support the respective parts. It is being The camshaft supports the journal portions on the camshaft bracket 36, respectively. After the suspension is installed, the cooperating bearing caps 38 are each attached to the cap bolts 40. It is rotatably supported by attaching it to the shaft. The cylinder head main body 12 has a large number of cylinder heads as shown in FIGS. 1 and 5. into the crankcase by a large number of head bolts inserted into the bolt holes 42 of the The tappet block 14 is also tightened through the numerous bolt holes 44. One of the many mounting bolts 46 and the cap bolt 40 to be inserted (see FIG. 5) ) is tightened to the upper end surface of the cylinder head body 12.

[0008] Further, a crank is installed in the wall portion 48 facing the cavity 22 of the cylinder head main body 12. A vertical oil passage 50 is provided that communicates with the oil supply hole of the case, and the vertical oil passage 50 is provided in a wall portion. 48 in the camshaft bracket 36 of the tappet block 14. It communicates with the oil passage 52. A vertical oil passage 52 is bored inside the tappet block 14. It communicates with the horizontal oil passage 54, and the horizontal oil passage 54 has an opening on the bearing surface of each camshaft bracket 36. A branch oil passage 56 is in communication (see FIG. 5). In addition, in this embodiment, as shown in FIG. Inside, there is a fuel injection nozzle whose tip opens directly into the lower end surface of the cylinder head body. Series for direct injection diesel engines provided with a nozzle hole 58 for insertion A printer head 10 is illustrated. However, of course, the present invention is based on the auxiliary combustion chamber type diesel engine. It can also be applied to the cylinder head of a diesel engine; in this case, the cylinder head A sub-combustion chamber is formed within the head body 12, and a mouthpiece is provided at the opening of the sub-combustion chamber. It will be done. Furthermore, the reference numeral 60 in the figure indicates a sand removal hole provided on the rear wall of the cylinder head body 12. A plug that closes the hole, 62 is a hole opening in the horizontal oil passage 54 of the tappet block 14. It is a plug that closes off the end.

[0009] According to the above configuration, severe high-temperature strength is required in contact with high-temperature, high-pressure combustion gas. The cylinder head body 12 is made of cast iron, and the conditions for temperature and strength are relatively relaxed. The sharp tappet block 14 has a two-part structure made of light alloy such as aluminum alloy. By doing so, while ensuring the durability and reliability of the cylinder head 10, it is also lightweight. quantification can be achieved. In addition, by making it a two-part structure, it is possible to Compared to the case of , casting is easier and products with fewer casting defects can be manufactured at a higher yield. be able to.

0010

[Effect of the idea]

As mentioned above, the cylinder head of the diesel engine according to the present invention is mounted on a case, and equipped with an intake valve and an intake port, and an exhaust valve and an exhaust port. The cylinder head body is made of cast iron, and the above-mentioned intake air is mounted on the cylinder head body. A camshaft that supports a camshaft equipped with an intake cam and an exhaust cam that open and close valves and exhaust valves. interposed between the bracket, the intake cam and exhaust cam, and the intake valve and exhaust valve. tappet holes into which an intake tappet and an exhaust tappet are slidably fitted, respectively. It is characterized by being equipped with a light metal tappet block, which is lightweight and durable. This has the effect of providing a cylinder head with excellent durability and reliability.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a side view seen from the direction of arrow III in FIG. 2;

4 is a side view seen from the direction of arrow IV in FIG. 2. FIG.

FIG. 5 is a sectional view taken along line V-V in FIG. 2;

[Explanation of symbols]

10 cylinder head 12 Cylinder head body 14 Tappet block

Claims (1)

[Scope of utility model registration request] Claim 1: A cast iron cylinder head body mounted on a crankcase and equipped with an intake valve and an intake port, and an exhaust valve and an exhaust port, and a cylinder head body mounted on the cylinder head body and equipped with the intake valve and the exhaust valve. a camshaft bracket that pivotally supports a camshaft equipped with an intake cam and an exhaust cam that open and close;
A tappet block made of light alloy is provided with tappet holes into which intake tappets and exhaust tappets, which are interposed between the intake cam and exhaust cam and the intake valve and exhaust valve, are slidably fitted, respectively. Diesel engine cylinder head characterized by