JPH05149119A - Lubricating device for internal combustion engine - Google Patents

Abstract

PURPOSE:To provide a lubricating device of an internal combustion engine capable of providing a transverse oil passage without interrupting processing of a bearing surface of a valve spring and causing interference with air intake and exhaust passages and of compacting the length of the engine in the cam shaft direction. CONSTITUTION:In an internal combustion engine arranged with a head bolt 5 to fasten a cylinder head 3 on a cylinder block 2 on the side of a cylinder bore 2b in the cam shaft direction, a lubricating device having a transverse oil passage 22 extending in the direction to cross cam shafts 16, 17 and communicating through with an air intake side oil passage 20 and an exhaust side oil passage 21 of the cylinder head 3 and supplying lubricating oil to cam shaft bearing parts 18a, 19a is constituted. In this case, the transverse oil passage 22 is to be a separate tubular part from the cylinder head 3 and it is installed above the head bolt 5 free to disconnect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an internal combustion engine, and more particularly, to a structure of a transverse oil passage extending in a direction traversing a cam shaft and connecting an intake-side oil passage and an exhaust-side oil passage of a cylinder head. Regarding the improvement of.

[0002]

2. Description of the Related Art A lubricating device for an internal combustion engine is constructed so that lubricating oil from an oil pump is supplied to a bearing portion of a cam shaft, a cam nose portion, a support hole of a lash adjuster, and the like, which require lubrication, through an oil passage. Has been done. As a structure of the oil passage in such a lubricating device, there is a structure described in, for example, Japanese Patent Laid-Open No. 2-40011.
This forms a pair of vertical oil passages extending in the cam axis direction on the intake side and the exhaust side of the cylinder head, and allows one of the vertical oil passages to communicate with the vertical oil passage formed in the cylinder block. The vertical oil passages are communicated with each other through transverse oil passages formed at both ends of the cylinder head in the cam axis direction, whereby the lubricating oil supplied from the oil pump through the cylinder block is supplied to the pair of vertical oil passages. I am trying.

[0003]

However, in the above-mentioned conventional lubricating device, since the transverse oil passages are formed at both ends of the cylinder head in the cam axis direction, the length of the engine in the cam axis direction is increased by the amount of the transverse oil passages. There is a problem that it becomes longer. In order to avoid this problem, it is conceivable that the transverse oil passage is formed between the cylinder bores or the like. However, a head bolt is generally arranged between the cylinder bores of the cylinder head, and a seat surface of the valve spring, intake air, an exhaust passage, etc. are formed near the upper portion of the cylinder bore.
It is difficult to integrally form the transverse oil passage while avoiding interference with the seating surface of the valve spring without interfering with the processing.

The present invention has been made in view of the above-mentioned conventional situation, and the crossing oil passage is formed in the cylinder without interfering with the machining of the seating surface of the valve spring and without interfering with the intake and exhaust passages. An object of the present invention is to provide a lubricating device for an internal combustion engine, which can be provided in the head and can make the length of the engine in the cam axis direction compact.

[0005]

SUMMARY OF THE INVENTION The present invention extends in a direction traversing the cam shaft of an internal combustion engine in which head bolts for fastening the cylinder head to a cylinder block are arranged on both sides of the cylinder bore in the cam shaft direction, and the intake air of the cylinder head is introduced. In a lubricating device that has a transverse oil passage that communicates the side oil passage and the exhaust oil passage, and that supplies lubricating oil to the camshaft bearing portion, etc., the transverse oil passage is a tubular body separate from the cylinder head, Further, it is characterized in that it is detachably mounted above the head bolt.

[0006]

In the state where the cylinder head is fastened to the cylinder block with the head bolt, there is a dead space above the head bolt, but in the present invention, since the dead space is utilized to provide the transverse oil passage, The length of the cylinder head in the cam axis direction can be made smaller than in the case where the conventional transverse oil passages are provided at both ends of the cylinder head.

Further, in disposing the transverse oil passage above the head bolt, the oil passage is structured to be attachable to and detachable from the cylinder head. Therefore, the seating surfaces of the valve spring and the head bolt are machined to form the head bolt. After concluding
It can be equipped with the above-mentioned transverse oil passage, and can be machined,
It does not hinder the tightening of head bolts.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views for explaining a lubrication device for a 5-valve engine according to an embodiment of the present invention.
5, 6 and 7 are respectively II line, VV line and VI-VI of FIG.
Line, VII-VII line sectional view, FIG. 2 is a plan view, and FIG. 3 is III-I of FIG.
A sectional view taken along line II, and Fig. 4 is a bottom view of the head cover.

In the figure, reference numeral 1 denotes an engine equipped with the device of the present embodiment, in which a cylinder head 3 is mounted on the upper surface of a cylinder block 2, both are fastened with a head bolt 5, and the upper side of the cylinder head 3 is further mounted. The head cover 4 is attached to the mating surface 3a via the seal member 4f.

A piston (not shown) disposed in the cylinder bore 2b on the lower mating surface 3b of the cylinder head 3.
A combustion concave portion 3c forming a combustion chamber is formed by.
In the combustion recess 3c, three intake valve openings 3d and two exhaust valve openings 3e are arranged and formed so as to form a substantially circumference along the peripheral edge thereof, and each of the openings 3d, 3e is formed in the intake passage 3f,
Each of the exhaust passages 3g is led to the outer wall of the cylinder head. The spark plug 1 is provided at the center of the combustion recess 3c.
5 is screwed. The electrode 15a of the plug 15 faces the combustion chamber, and the ignition cord 15
b is led out vertically upward through the plug insertion hole 3n.

An intake valve 6 is arranged in each intake valve opening 3d, and an exhaust valve 7 is arranged in each exhaust valve opening 3e. The intake valve 6 and the exhaust valve 7 extend upward through a valve guide 9c and form a predetermined valve holding angle.
It projects into the intake and exhaust cam chambers a and a ', respectively.
And a retainer 8 attached to the upper ends of the valves 6 and 7,
A valve spring 10 is interposed between the spring seats 9a and 9b arranged on the spring seat 3h of the cylinder head 3.
As a result, the valves 6 and 7 are urged in the direction of closing the openings 3d and 3e.

Of the spring seats 3h, the spring seats 3h 'located on the intake side and at both ends in the cam axis direction are close to the head bolts 5' located outside thereof. Therefore, the washer 5a of the head bolt 5'and the spring seat 3
When viewed in the cylinder bore axial direction, the spring seat 9a 'having a larger diameter than that mounted on h'is overlapped.
In the present embodiment, as shown in FIG. 1, in order to avoid the interference between the washer 5a and the spring seat 9a ', the shape of the spring seat 3h' is changed so that the height of the portion facing the washer 5a is the washer 5a. It is set to be higher than the upper surface of.

Further, the tip end pressing surfaces 11a and 12a of the intake and exhaust swing arms 11 and 12 are in contact with the upper end surfaces of the intake valves 6 and exhaust valves 7, respectively.
The base parts 11b and 12b of the lash adjusters 1 and 12 are rush adjusters 1.
It is supported by the supporting portions 13a and 14a of 3,14. The lash adjusters 13 and 14 are the cylinder head 3
Is inserted and disposed in a support hole 3i formed in parallel with the valves 6 and 7. The support hole 3i is the communication hole 3j.
Communicate with the cam chambers a and a '.

The upper mating surface 3a of the cylinder head 3
Intake and exhaust camshafts 16 and 17 are arranged in parallel above the intake and exhaust swing arms 11 and 12, respectively. The intake and exhaust camshafts 16 and 17 have three intake cam noses 16 for each cylinder bore 2b.
a, two exhaust cam noses 17a are formed, and each cam nose 16a, 17a is formed by each swing arm 1 described above.
It is in sliding contact with the sliding surfaces 11c and 12c. The intake and exhaust cam shafts 16 and 17 are connected to the cylinder bore 2
It is axially supported by an intake bearing 18 and an exhaust bearing 19 which are arranged in the center of the cam axis direction of a. The intake bearing 18 includes a cam journal 18a formed between the center of the cylinder head 3 and a side cam nose, and two pairs of fixing bolts 1 attached to the cam journal 18a.
The cam cap 18b is fixed at 8d. Each cam cap 18b has a cam nose 1
Umbrella part 1 for preventing lubricating oil from 6a from scattering around
8c is integrally formed. Also, the exhaust bearing 19
Is a cam journal 19a formed between the cam noses.
And a cam cap 19b fixed thereto with a fixing bolt 19d, and has an umbrella portion 19c similar to that on the intake side.

Since the cam journal 18a is located above the upper end of the intake valve 6, the central intake valve valve spring 10 'cannot be mounted from above. Therefore, in this embodiment, as shown in FIG. 6, among the openings formed in the lower portion of the fixing bolt 18d, one of the openings 3p is provided so that the valve spring 10 'can be moved in the cam axis direction. Is set larger than the opening 3q.

Intake of the outer wall of the cylinder head 3
The vertical oil passage 2 is provided above the exhaust passages 3f and 3g.
0 and 21 are formed parallel to the cam shafts 16 and 17.
The vertical oil passages 20 and 21 penetrate the support holes 3i in which the lash adjusters 13 and 14 are inserted, and the oil supply holes 20a and 21a allow the cam journals 18a and 19 of the intake and exhaust bearings 18 and 19, respectively.
It communicates with a. As a result, rush adjuster 1
Lubricating oil can be supplied to the bearings 3 and 14 and the bearings 18 and 19. The oil passage 20 on the intake side is connected to the oil supply pump side via vertical oil passages 20b, 2a vertically formed in the cylinder head 3 and the cylinder block 2. Further, 20c and 21a are plugs for closing the processed holes.

The vertical oil passage 20 on the intake side communicates with the vertical oil passage 21 on the exhaust side via a transverse oil passage 22. The transverse oil passage 22 is formed by integrally forming a plug 22b at one end of a tubular oil pipe 22a, and the cylinder bore 2 of the engine.
A portion immediately above the head bolt 5 located between b and 2b is traversed in a direction perpendicular to the cam shaft. The transverse oil passage 22 is attachable to and detachable from the cylinder head 3 by the following structure. That is, the oil pipe 22a is inserted through the insertion hole 3k formed on the exhaust side of the cylinder head 3 so as to communicate with the vertical oil passage 21, and the tip of the oil pipe 22a is formed so as to communicate with the vertical oil passage 20. The plug 22
b is screwed into the insertion hole 3k. A communication hole 22c is formed at the end of the oil pipe 22a on the exhaust side so that the pipe 22a communicates with the vertical oil passage 21 on the exhaust side.

The vertical oil passage 21 on the exhaust side is
The connecting passage 21b extends along the boundary wall between the chain chamber b and the cam chambers a and a'to the cylinder bore center side, and further extends to the upper mating surface 3a side, and the tensioner 24 and the chain 25 are arranged via the branch passage 21c. It communicates with the provided chamber b. The communication passage 21b is formed integrally with the head cover 4 and communicates with the relief chamber 4a that houses the relief valve 23. And this relief room 4a
Communication passage 4 integrally formed on the inner surface of the head cover 4
It communicates with the intake side and exhaust side oil supply passages 4c and 4d via b. A large number of oil nozzles 4e are formed in each of the oil supply passages 4c and 4d at a predetermined pitch. The oil nozzles 4d correspond to the cam noses 16 described above.
The lubricating oil is supplied to the cam noses 16a and 17a.

Next, the function and effect of this embodiment will be described. In the engine 1 of the present embodiment, the transverse oil passage 22 is mounted on the cylinder head 3. This mounting work is performed after the cylinder head 3 is mounted on the cylinder block 2 and each head bolt 5 is tightened. , Do. In this case, it suffices to insert the transverse oil passage 22 from the outside of the cylinder head 3 on the exhaust side and screw the plug 22b into the insertion hole 3k.

In the present embodiment, the lubricating oil discharged from the oil supply pump flows into the vertical oil passage 20 on the intake side through the vertical oil passages 2a and 20b, and then passes through the transverse oil passage 22 to be exhausted. Flows into the vertical oil passage 21 on the side. The oil pressure in each oil passage is controlled by the relief valve 23.
Adjusted by As a result, each lash adjuster 13, 14, each cam bearing 18, 19, the tensioner 24,
Lubricating oil is supplied to the drive chain 25. The lubricating oil that has passed through the relief valve 23 is injected and supplied to each cam nose portion via the intake side and exhaust side oil supply passages 4c and 4d of the head cover 4.

In the apparatus of this embodiment, since the transverse oil passage 22 is disposed above the head bolt between the cylinder bores, the dead space after the head bolt is fastened can be effectively used. For example, the above-mentioned conventional example. It is possible to reduce the length of the engine in the camshaft direction as compared with the case where the transverse oil passages are formed at both ends of the cylinder head as described above.

Further, in this embodiment, the crossing oil passage 2 is provided.
Since 2 is detachable from the cylinder head 3, the spring seat 3h of the valve spring 10 and the seat surface of the head bolt 5 can be machined, and the transverse oil passage 22 can be mounted after fastening the head bolt 5. Therefore, there is no hindrance to the above-mentioned machining, mounting of head bolts and the like.

Since the oil supply passages 4c and 4d communicating with the vertical oil passage 21 are formed in the head cover 4,
Lubricating oil can be sufficiently supplied to each cam nose 16a, 17a. Further, in this case, since the cam caps 18b and 19b are formed with the umbrella portions 18c and 19c, it is possible to prevent the lubricating oil from scattering and reduce the generation of oil mist in the cam chamber.

Further, in this embodiment, the height of the spring seats 3h 'at both ends in the cam axis direction is set higher than that of the washer 5a for the head bolt 5', so that the washer 5a and the spring seat 9a 'for the spring seat 3h are provided. It is possible to bring them close enough to overlap each other in a plan view without interference. As a result, the length in the camshaft direction can be shortened even with a 5-valve engine.

Furthermore, since the opening 3p for laterally moving the valve spring 10 is provided below the cam journal 18a, the valve spring 10 'can be easily mounted.

[0026]

As described above, according to the lubricating device for an internal combustion engine of the present invention, the transverse oil passage connecting the oil passages on the intake side and the exhaust side is attached to and detached from the upper portion of the head bolt on the side of the cylinder bore. Since the arrangement is made possible, there is an effect that the length of the cylinder head in the cam axis direction can be shortened without affecting the machining of the seat surface of the head bolt and the tightening work of the head bolt.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a plan view showing a lubrication device for a 5-valve engine according to an embodiment of the present invention.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a bottom view of the head cover of the engine of the embodiment.

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

7 is a sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

 1 Engine (Internal Combustion Engine) 2 Cylinder Block 2b Cylinder Bore 3 Cylinder Head 5 Head Bolt 16,17 Cam Shaft 18,19 Cam Shaft Bearing 20,21 Intake Side / Exhaust Side Longitudinal Oil Passage 22 Crossing Oil Passage

Claims (1)

[Claims] 1. An intake-side oil passage and an exhaust-side oil passage of a cylinder head of an internal combustion engine in which a head bolt for fastening a cylinder head to a cylinder block is arranged laterally in the cam axis of a cylinder bore. In a lubricating device that has a transverse oil passage that communicates with and that supplies lubricating oil to the camshaft bearing portion, etc., the transverse oil passage is a tubular body separate from the cylinder head, and is attached / detached above the head bolt. A lubricating device for an internal combustion engine, which is mounted so as to be possible.