JP2003254027A - Upper part structure of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology wherein lubricating oil is surely fed to a valve arm shaft without installing a pipe, and also to provide a mounting structure of a high-pressure fuel pipe for a fuel injection valve with an excellent maintainability. <P>SOLUTION: In this upper structure of an engine, a bonnet 2 covering the upper part of a cylinder head 12 is disposed on the cylinder head 12. A lubricating oil passage is formed in a spacer 4 installed between the cylinder head 12 and the bonnet 2. Also the high-pressure fuel pipe 62 is passed, through a seal 64, through the spacer 4 installed between the cylinder head 12 and the bonnet 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper structure of an engine, and more particularly to a technique for supplying lubricating oil to a valve arm shaft and a structure for mounting a fuel high pressure pipe of a fuel injection valve.

[0002]

2. Description of the Related Art Conventionally, in an upper structure of an engine, a spacer and a bonnet are attached to a cylinder head for each cylinder, and the cylinder head is covered by the bonnet.
When supplying lubricating oil to the valve arm shaft with such a configuration,
A method of removing the bonnet and directly supplying the lubricating oil from a hole provided in the valve arm shaft has been adopted. Further, in the four-valve type cylinder head in which the fuel injection valve is arranged vertically, the high-pressure fuel pipe is arranged above the fuel injection valve,
Attached to the bonnet via the inject cushion pipe seal, connected to the fuel injection pump, or provided with the inject cushion pipe seal insertion part in the cylinder head,
A high-pressure fuel pipe was attached to the insertion portion via a seal, the high-pressure pipe was passed through the bonnet, and the fuel injection pump was connected.

[0003]

However, in the conventional engine upper structure, the number of parts is increased and the assembling work becomes complicated. Further, the mounting accuracy may greatly affect each spacer, and a great deal of labor is required for work such as maintenance. Also, the fuel high pressure pipe is
Since it was installed above the fuel injection valve and attached to the bonnet via the inject cushion pipe seal, when removing the bonnet for maintenance, the high pressure pipe had to be removed, and it was difficult to remove the bonnet. . Therefore, the present invention provides a technique capable of reliably supplying the lubricating oil to the valve arm shaft without providing a pipe, and a structure for mounting the fuel high pressure pipe of the fuel injection valve with good maintainability.

[0004]

The problem to be solved by the present invention is as described above, and the means for solving this problem will be described below.

That is, according to the first aspect of the present invention, in the upper structure of the engine in which the bonnet for covering the upper portion of the cylinder head is provided in the cylinder head, the lubricating oil passage is provided in the spacer provided between the cylinder head and the bonnet. Is formed.

According to a second aspect of the present invention, in the cylinder head,
In a superstructure of an engine in which a bonnet covering the upper part of the cylinder head is provided, a high pressure fuel pipe is penetrated through a spacer provided between the cylinder head and the bonnet via a seal.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. 1 is a schematic cross-sectional view of the upper part of the engine, FIG. 2 is a plan view of the upper part of the engine, FIG. 3 is a plan view showing a spacer, FIG. 4 is a cross-sectional view showing a lubricating oil passage to the valve arm shaft, and FIG. It is sectional drawing which shows the attachment structure of a pipe.

The schematic structure of the upper portion of the engine of the present invention will be described with reference to FIGS. 1 and 2. The spacer 4 and the bonnet 2 are arranged on the upper side of the cast iron cylinder head 12,
By fastening the spacer 4, the cylinder head 12 and the bonnet 2 with bolts 13 ...
Is formed. The cylinder head 12 is formed with a valve mounting hole 12a extending from the lower combustion chamber to the valve arm chamber 14, and the fuel injection valve 6 is inserted into the valve mounting hole 12a in an upright state.

The cylinder head 2 has an intake valve 31.
31 and the exhaust valves 32, 32, the valve arm 36, the upper part of the rod 37, the fuel injection valve 6 and the like are housed. The engine in this embodiment has, for example, three cylinders,
Two intake valves 31 and two exhaust valves 32 for each cylinder
A so-called four-valve engine provided with 32.

The valve arm 36 is composed of the intake valves 31.3 of each cylinder.
One is provided for each one and for each exhaust valve 32, 32, and is supported by the valve arm shaft 35. Each valve arm 36
At one end of the rod 37 is fixed. The other end of the rod 37 is connected to a cam (not shown) arranged near the cylinder, and the rod 37 and the valve arm 36 slide by the rotationally driven cam. And the valve arm 36
By the swinging motion of the intake valve 31, the exhaust valve 3
The parts 2 and 32 are configured to be opened and closed respectively.

Next, the spacer will be described with reference to FIGS. 3 and 4. A spacer 4 is provided between the cylinder head 12 and the bonnet 2. As shown in FIG. 3, the spacer 4 is composed of an outer peripheral portion 44 that is integral with all cylinders and a partition portion 41 that is provided between the cylinders. The spacer 4 has a polygonal shape per cylinder, and the outer peripheral portion 44 and the partition portion 41 have a ladder frame shape. In this way, the spacer 4 is formed integrally with all cylinders, and the partition portion 41 is provided between the cylinders to form a ladder frame.
By forming the shape per cylinder into a polygonal shape, the rigidity of the spacer 4 can be improved, and since all cylinders are integrated, the number of parts can be reduced.

As shown in FIG. 4, the outer peripheral portion 44 is formed to have a higher vertical height than the partition portion 41. The bonnet 2 is mounted and fixed on the outer peripheral portion 44 to cover the cylinder head 12. Space inside the cylinder head (valve arm chamber 14)
Has been secured. On the other hand, the partition part 41 is
Also, they are arranged on both sides of the spacer 4. Each partition 4
1, bolt holes 41a, 41a are formed in the vertical direction. A lubricating oil hole is formed in one of the partition parts. In the present embodiment, the partition 41 arranged on one side of the spacer 4 is provided with a lubricating oil hole 41b.
A lubricating oil passage 41c is formed below the lubricating oil hole 41b, and lubricating oil is supplied from an oil pump (not shown) to the lubricating oil passage 41c and the lubricating oil hole 41b.

Next, the support member will be described. The support member 5 is provided above the partition portion 41 and supports the valve arm shaft 35 arranged in parallel with the crankshaft core. As shown in FIG. 2, the valve arm shaft 35 movably fits and supports the intake and exhaust valve arms 36 ... For each cylinder, and also supports a plurality of support members 5. By, it is supported so that it cannot rotate and cannot move in the axial direction.

As shown in FIG. 4, the supporting member 5 is formed in a substantially rectangular shape in cross section, and has bolt holes 51.
51 is provided. The bolt holes 51, 51 are arranged on the same axis as the bolt holes 41a, 41a, and bolts are fitted into the bolt holes 51, 41a from above the support member 5 to fix the support member 5 to the partition portion 41. ing. Also,
A valve arm shaft support portion 53 is formed on the support member 5, the valve arm shaft 35 is inserted and fitted, and the support member 5 supports the valve arm shaft 35.

A lubricating oil passage 52 is formed below the valve arm shaft support portion 53. The lubricating oil passage is provided only in the support member 5 arranged above the lubricating oil hole 41b. In this embodiment, the support member 5 mounted and fixed on the partition portion 41 arranged on one side of the spacer 4 is
A lubricating oil passage 52 is provided. The lubricating oil passage 52 is disposed above the lubricating oil hole 41b of the support member 5, and connects the lubricating oil hole 41b and the valve arm shaft support portion 53.

Next, the valve arm shaft 35 will be described with reference to FIGS. The valve arm shaft 35 has a hollow central portion 35b and is formed in a tubular shape with both ends closed.
A hole 35a is provided for each engaging portion with. The hole 35
The letter a is formed outward from the center of the valve arm shaft 35. Further, the hole 35a provided in the engaging portion with the support member 5 in which the lubricating oil passage 52 is formed is
2 to connect the lubricating oil passage 52 with lubricating oil to the central portion 35.
b.

With such a structure, the lubricating oil supplied from the oil pump can be supplied as shown by the arrow in FIG.
Through the lubricating oil passage 41c and the lubricating oil hole 41b provided in the spacer 4, the lubricating oil passage 52 of the support member 5 and the hole 35 are formed.
It flows from a to the central portion 35b of the valve arm shaft 35. And FIG.
Through the central portion 35b as shown by the arrow in FIG.
By supplying lubricating oil to the outer peripheral surface of the valve arm shaft 35 from the engagement surface between the valve arm shaft 35 and the support member 5 via 5a.
The rocking motion of the valve arms 36 ... Supported by the valve arm shaft 35 is made smooth. In this way, the cylinder head 1
Since the lubricating oil passage is formed in the spacer 4 provided between the hood 2 and the bonnet 2, the lubricating oil can be reliably supplied to the valve arm shaft 35 without providing piping, and the durability of the valve arm shaft 35 is improved. it can.

Next, the mounting structure of the fuel high-pressure pipe will be described. As shown in FIG. 5, the fuel injection valve 6 integrally has a laterally projecting fuel inlet portion 61 in the middle of the vertical length, and a fuel high pressure pipe 62 is connected to the fuel inlet portion 61. . The fuel high-pressure pipe 62 projects outward from the valve arm chamber 14,
It is connected to a fuel injection pump (not shown). And
The fuel pressurized by the fuel injection pump is the fuel high pressure pipe 62.
High-pressure fuel is pressure-fed to the fuel injection valve 6 via. On the other hand, on the side surface of the spacer 4, an opening 46 is provided for each cylinder, and the fuel high-pressure pipe 62 penetrates into the opening 46. A boss 63 is mounted on the outer periphery of the fuel high-pressure pipe 62, and an inject cushion pipe seal 64 is provided between the boss 63 and the opening 46 to seal the boss 63 and the opening 46.

In this way, the spacer 4 is provided between the cylinder head 12 and the bonnet 2, the opening 46 is provided in the spacer 4, the fuel high-pressure pipe 62 is provided inside the opening 46, and the inject cushion pipe seal. By arranging through 64,
The bonnet 2 can be removed without removing the fuel high-pressure pipe 62, maintenance such as valve clearance adjustment and fuel injection nozzle replacement can be facilitated, and workability can be improved. Further, the spacer 4 can be made of an aluminum alloy, and the weight can be reduced. Further, the space above the hood 2 can be effectively used.

[0020]

Since the present invention is constructed as described above,
The following effects are achieved.

That is, as described in claim 1, in the upper structure of the engine in which the cylinder head is provided with the bonnet for covering the upper portion of the cylinder head, the lubricating oil is provided on the spacer provided between the cylinder head and the bonnet. Since the passage is formed, the lubricating oil can be reliably supplied to the valve arm shaft without providing piping, and the durability of the valve arm shaft can be improved. Further, the spacer can be integrated with all cylinders, and each cylinder can be provided with a partition to form a ladder frame shape, whereby rigidity can be improved and the number of parts can be reduced.

According to a second aspect of the present invention, in the cylinder head,
In a superstructure of an engine in which a bonnet covering the upper part of the cylinder head is arranged, the fuel high pressure pipe is penetrated through a spacer provided between the cylinder head and the bonnet, so that the fuel high pressure pipe must be removed. Therefore, maintenance such as valve clearance adjustment and fuel injection nozzle replacement can be easily performed in the bonnet.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an upper portion of an engine.

FIG. 2 is a plan view of the upper part of the engine.

FIG. 3 is a plan view showing a spacer.

FIG. 4 is a sectional view showing a lubricating oil passage to a valve arm shaft.

FIG. 5 is a cross-sectional view showing a mounting structure of a fuel high-pressure pipe.

[Explanation of symbols]

2 bonnet 4 Zama 12 cylinder head 62 Fuel high pressure pipe 64 Inge Cushion Pipe Seal

Claims (2)

[Claims] 1. In a superstructure of an engine in which a bonnet covering the upper part of the cylinder head is provided in the cylinder head, a lubricating oil passage is formed in a spacer provided between the cylinder head and the bonnet. And the superstructure of the engine. 2. In a superstructure of an engine in which a bonnet for covering the upper portion of the cylinder head is provided in the cylinder head, a high pressure fuel pipe is penetrated through a spacer provided between the cylinder head and the bonnet via a seal. The superstructure of the engine, which is characterized by