JPH0626316A - Lubricating oil passage structure of cylinder head - Google Patents

Abstract

PURPOSE:To increase the layout freedom of oil passages and hydraulic operating mechanism in the cylinder head of an engine and avoid the detour of the oil passage so as to reduce the machining manhours of the oil passage. CONSTITUTION:An oil flow space 82 formed between the outer peripheral surface of a plug pipe 80 and the inner surface of a plug fitting hole 70 is extended in the axial direction of the plug pipe 80. An oil passage 84-1 pointing to the crank axis direction on one side of the plug pipe 80, and an oil passage 84-2 pointing to the crank axis direction on the other side of the plug pipe 80 are disposed with position difference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil passage structure for a cylinder head, and more particularly to a cylinder having a large degree of freedom in layout of an oil passage and a hydraulic actuating mechanism and capable of reducing the number of processing steps for the oil passage. The present invention relates to a lubricating oil passage structure for a head.

[0002]

2. Description of the Related Art In an engine, a combustion chamber 10 is provided on a lower surface 102a of a cylinder head 102 as shown in FIGS.
4 is formed, and the plug mounting hole 1 is formed in the upper part of the combustion chamber 104.
06 is formed on the head 108 of the cylinder head 102 by a mounting hole forming surface 110, an ignition plug 112 is provided in the plug mounting hole 106, and one end side of a plug pipe 114 surrounding the ignition plug 112 in the plug mounting hole 106. A lower end side is fitted and a cylinder head cover 116 is provided on the upper end side which is the other end side of the plug pipe 114, and an annular oil circulation space 118 is provided between the mounting hole forming surface 110 and the outer peripheral surface 114a of the plug pipe 114. To form
An oil passage 120, which communicates with the oil circulation space 118 with the plug pipe 114 interposed, is formed in the crankshaft center direction (indicated by arrow A in FIG. 7).

A cam chain adjuster 124, which is hydraulically operated to adjust the tension of the cam chain 122, is arranged on the upper head portion 108 of the cylinder head 102.

The oil from the oil circulation space 118 is introduced from another bypassed oil passage as shown by the arrows in FIGS. 5 to 7 and supplied to the cam chain adjuster 124 and the like for lubrication. .

Such an oil passage structure is disclosed, for example, in Japanese Utility Model Laid-Open No. 63-113705. The one described in this publication is formed by inclining the lower inner surface of the cylinder head downward toward the center side in the cylinder arrangement direction so as to form an oil sump in the center portion in the cylinder arrangement direction. The suction port of the suction passage, which communicates with the oil pump that communicates with the oil sump for returning, is opened to the oil sump.

[0006]

However, conventionally, when a hydraulic actuating mechanism such as a chain adjuster which is actuated by hydraulic pressure is located above the oil passage, the oil passage must be bypassed, and therefore, the oil passage must be bypassed. There is a problem that the layout of the hydraulic operating mechanism is restricted and the number of man-hours for processing the oil passage increases.

[0007]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a plug pipe surrounding the ignition plug attached to the cylinder head in the plug attachment hole of the cylinder head. An oil distribution space is formed between the mounting hole forming surface of the plug mounting hole and the outer peripheral surface of the plug pipe, and an oil passage communicating with the oil distribution space with the plug pipe sandwiched is oriented in the crankshaft axial direction. In the formed lubricating oil passage structure of the cylinder head, the oil circulation space is extended in the pipe axis direction of the plug pipe, and the one side of the plug pipe is oriented in the crank axis direction. It is characterized in that the positions of the passage and the oil passage on the other side directed toward the crankshaft axis on the other side of the plug pipe are different.

[0008]

According to the structure of the present invention, the oil passage on one side of the plug pipe and the oil passage on the other side of the plug pipe are provided at different positions, so that the layout of the oil passage and the hydraulic operating mechanism is free. In addition to the high degree, it is not necessary to bypass the oil passage, so the number of processing steps can be reduced.

[0009]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 4, 2 is a V-type engine. The engine 2 includes a V-shaped cylinder block 4, a primary side, and secondary cylinder banks 6 and 8 on which primary and secondary cylinder heads 10 and 12 are mounted. It has engine banks 14 and 16.

A crank bearing cap 18 is attached to the lower portion of the cylinder block 4. An oil pan (not shown) is attached to the lower portion of the crank bearing cap 18.

A crankshaft 20 is axially supported by the cylinder block 4 and the crank bearing cap 18. A crank sprocket 22, which is a drive side sprocket, is fixedly attached to the front end of the crank shaft 20.

The primary side cylinder head 10 is provided with primary side intake and primary side exhaust cam shafts 24 and 26 which are spaced apart from each other on the upper end sides thereof, that is, which are arranged in parallel. The primary-side intake and primary-side exhaust cam shafts 24 and 26 have primary-side intake and primary-side exhaust cam sprockets 28 and 3, respectively.
0 is fixedly attached. Further, the primary side cylinder head 10 is provided with a primary side cylinder head cover 32 so as to form a primary side valve operating chamber (not shown).

The secondary cylinder head 12 is provided with secondary intake air and secondary exhaust cam shafts 34, 36 which are spaced apart from each other on both ends of the upper portion, and which are arranged in parallel. Has been. Secondary intake, secondary exhaust camshaft 3
Secondary-side intake and secondary-side exhaust cam sprockets 38 and 40 are fixedly installed at 4, 36. Further, the secondary side cylinder head 12 is provided with a secondary side cylinder head cover 42 so as to form a secondary side valve operating chamber (not shown).

A primary timing chain sprocket 44 and a primary cam chain are integrally formed on the primary cylinder head 10 on the primary cylinder bank 6 side of the primary intake and exhaust cam sprockets 28 and 30. Primary idler shaft 4 supporting sprocket 46
8 are provided.

A secondary side timing chain sprocket 50 is attached to the secondary side intake cam shaft 34.

A central idler shaft 52 is fixedly provided on the cylinder block 4 between the primary and secondary cylinder banks 6 and 8. The center side idler shaft 52 has a center side timing chain sprocket 1
4 are provided.

A timing chain 56 is wound around the crank sprocket 22, the primary side timing chain sprocket 44, the central side timing chain sprocket 54, and the secondary side timing chain sprocket 50.

The primary side cam chain sprocket 46
And intake air on the primary side, exhaust cam sprockets on the primary side 28, 30
A primary-side cam chain 58 is wound around the and.

The secondary intake cam sprocket 3 is also used.
A secondary cam chain 60 is wound around the secondary exhaust cam sprocket 40 and the secondary exhaust cam sprocket 40.

An oil pump chain sprocket (not shown) having substantially the same diameter as the crank sprocket 22 is provided at the front end of the crankshaft 20.

The oil pump chain 62 wound around the oil pump chain sprocket is the oil pump 6
No. 4 oil pump sprocket 66 is wound around.

Further, as shown in FIG. 1, a spark plug mounting hole 70 is formed in the head upper portion 68 of the secondary side cylinder head 12.
Is formed by the mounting hole forming surface 72. The spark plug mounting hole 70 accommodates a spark plug 78 mounted on a secondary combustion chamber wall 76 of a secondary combustion chamber 74 formed on the lower surface 12 a of the secondary cylinder head 12. The secondary combustion chamber 74 has the secondary cylinder head 1
2 is formed to be open to the lower surface 12a.

A lower end side which is one end side of a plug pipe 80 is fitted and fixed in the ignition plug mounting hole 70.

On the upper end side which is the other end side of the plug pipe 80, the secondary side cylinder head cover 42 is provided to form a secondary side valve operating chamber.

The mounting hole forming surface 72 and the plug pipe 8
An oil circulation space 82, which is an annular gap, is formed between the outer peripheral surfaces 80a of 0. This oil distribution space 82
Are extended in the pipe axial direction of the plug pipe 80, that is, extended downward in the vertical direction below the secondary combustion chamber 74 side.

Further, the secondary side cylinder head 12 is formed with an oil passage 84 which communicates with the oil flow space 82 with the plug pipe 80 interposed therebetween.

This oil passage 84 is used for the plug pipe 8
Crankshaft center direction (shown by arrow A in FIG. 3) on one side of 0,
That is, the one side oil passage 84-
1 and the other side oil passage 84-2 on the other side of the plug pipe 80, which is oriented in the crankshaft axis direction.

The one-side oil passage 84-1 communicates with a substantially central portion of the oil circulation space 82 substantially orthogonal to the pipe axial center of the plug pipe 80, that is, the vertical direction.

The other side oil passage 84-2 is substantially orthogonal to the pipe axial center direction of the plug pipe 80 and communicates with the lower end side of the oil circulation space 82.

The one side oil passage 84-1 is located at a position higher than the other side oil passage 84-2 by a height H. As a result, the one-side oil passage 84-1 and the other-side oil passage 84-2 are arranged at different positions, that is, at different heights.

In the middle of the oil passage 84-2 on the other side,
A secondary side cam chain adjuster 86, which is a hydraulically operated mechanism that operates hydraulically, is provided. It is in communication.

Reference numeral 92 is a secondary side chain guide,
Reference numeral 94 is a head bolt, and 96 is a secondary side chain cover.

Next, the operation of this embodiment will be described.

The lubricating oil flowing into the one-side oil passage 84-1 flows to the other-side oil passage 84-2 through the oil circulation space 84, and the adjustment-side oil circulation space 90.
After that, the parts such as the secondary side cam chain adjuster 86 are lubricated.

By the way, in this embodiment, the primary side oil passage 84- formed in the secondary side cylinder head 12 is
1 side oil passage 84-2 to the other side oil passage 84-2
Since it is provided at a height position different from that of 4-1, it is not necessary to bypass the oil passage for the hydraulic operation mechanism such as the secondary side chain adjuster 86, and the degree of freedom of layout of the oil passage and the hydraulic operation mechanism is large. Can be

Further, since it is not necessary to bypass the oil passage 84, it is possible to reduce the man-hour for processing the oil passage and to reduce the cost.

In this embodiment, the oil passage of the secondary cylinder head 12 is described, but the primary cylinder head 10 may be provided with the same oil passage as the secondary cylinder head 12. . Further, the one-side oil passage 84-1 and the other-side oil passage 84-2 can be provided at different positions not only in the vertical direction but also in the horizontal direction.

[0038]

As is apparent from the above detailed description, according to the present invention, the oil flow space formed between the outer peripheral surface of the plug pipe and the inner surface of the mounting hole of the plug mounting hole is formed in the pipe axial direction of the plug pipe. The oil passage on one side of the plug pipe, which is directed in the direction of the crankshaft axis, and the oil passage on the other side of the plug pipe, which is directed in the direction of the crankshaft, are different in position. Since it is provided, the degree of freedom of the layout of the oil passage and the hydraulic operating mechanism is increased and it is not necessary to bypass the oil passage.
The number of man-hours for processing the oil passage can be reduced.

[Brief description of drawings]

1 is a cross-sectional view of the secondary side cylinder head taken along the line 〓-〓 of FIG.

FIG. 2 is a cross-sectional view of the secondary side cylinder head taken along the line 〓-〓 of FIG.

FIG. 3 is a plan view of the secondary side cylinder head taken along the line 〓-〓 of FIG.

FIG. 4 is a front view of a V-type engine.

FIG. 5 is a sectional view of a conventional cylinder head.

6 is a cross-sectional view taken along the line 〓-〓 of FIG.

FIG. 7 is a plan view taken along line 〓-〓 of FIG.

[Explanation of symbols]

 2 Engine 10 Primary side cylinder block 12 Secondary side cylinder head 70 Spark plug mounting hole 72 Mounting hole forming surface 78 Spark plug 80 Plug pipe 82 Oil distribution space 84 Oil passage 86 Secondary side cam chain adjuster 90 Adjuster side oil distribution space

Claims (1)

[Claims] 1. A plug pipe surrounding a spark plug attached to a cylinder head is provided in a plug mounting hole of the cylinder head, and oil is provided between a mounting hole forming surface of the plug mounting hole and an outer peripheral surface of the plug pipe. In a lubricating oil passage structure for a cylinder head, which forms a circulation space and has an oil passage communicating with the oil circulation space sandwiching the plug pipe, oriented in the crankshaft axis direction, the oil circulation space is used for the plug. One of the oil passages extending in the pipe axis direction of the pipe and oriented in the crank axis direction on one side of the plug pipe and the other side oriented in the crank axis direction on the other side of the plug pipe. The lubricating oil passage structure for a cylinder head, wherein the lubricating oil passage structure is provided at a position different from that of the oil passage.