JPS63176612A - Oil feeder in cylinder head for double overhead camshaft type internal combustion engine - Google Patents

Abstract

PURPOSE:To facilitate the machining of an oil feeding passage, by connecting a pivot part branch oil feeding passage and a camshaft bearing branch oil feeding passage both to one piece of the main oil feeding passage that is made to pierce through into each spark plug insertion cylinder of a cylinder head. CONSTITUTION:Piercing through each spark plug insertion cylinder 10 of a cylinder head 1, there is provided with one piece of a main oil feeding passage 20, and an inner cylinder 29 is fitly inserted into this spark plug insertion cylinder 10, thereby forming an annular oil feeding chamber 32. In addition, each rush adjuster 19 is installed in pivot parts 16 and 18 of a rocker arm for suction and exhaust valves, and a hydraulic chamber of the adjuster 19 and the annular oil feeding chamber 32 are interconnected to each other through pivot part branch oil feeding passages 27 and 28, then bearings 12 and 14 of a camshaft and the annular oil feeding chamber 32 are interconnected to each other through bearing branch oil feeding passages 25 and 26. With this constitution, the main oil feeding passage gets off with only one piece so that machining becomes facilitated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a so-called camshaft in which two camshafts, a camshaft for an intake valve and a camshaft for an exhaust valve, are disposed on the upper surface of a cylinder head. DOHC (double overhead camshaft)
The present invention relates to a device for supplying oil to a part of a piston 1 that supports an intake valve swing arm and an exhaust valve swing arm in a cylinder head of a type of internal combustion engine.

[Conventional technology]

Japanese Patent Application Laid-open No. 60-79141 as a prior art discloses that a combustion chamber for each cylinder arranged in a row is recessed on the lower surface, and a cylinder for inserting a spark plug is formed on the upper surface for each of the combustion chambers. The DOHC type internal combustion engine is equipped with a pivot part of the swinging arm for the intake valve and a pivot part of the swinging arm for the exhaust valve, which are integrally molded on the left and right sides of each spark plug insertion cylinder row. As a refueling device for an engine cylinder head, the cylinder head is provided with a main oil supply passage extending in the direction of each spark plug insertion cylinder row at both the left side and the right side of each spark plug insertion cylinder row. Supplying oil from one of the two main oil supply passages to the pivot part of the swinging arm for the intake valve, and supplying oil to each pivot part of the swinging arm for the exhaust valve from the other main oil supply passage. is proposed.

[Problem that the invention seeks to solve]

However, although the main oil supply passage here is extremely long in the axial direction of the crankshaft, this main oil supply passage must be drilled with a drill after the cylinder head is cast. Drilling two main oil supply passages as in the prior art,
The labor required for drilling this amphiphilic oil supply passage increases significantly, and the machining cost for the oil supply passage increases considerably.Moreover, providing two main oil supply passages means that the main oil supply The built-up portions necessary to provide the passages must also be formed separately for each of the ambidextrous oil supply passages, which increases the weight of the cylinder head and, by extension, the weight of the internal combustion engine.

The present invention aims to solve this problem.

[Failure to solve the problem]

Therefore, in the present invention, combustion chambers for each of the cylinders arranged in a row are recessed on the lower surface, while an ignition plug insertion tube is integrally provided on the upper surface for each of the combustion chambers. In a cylinder head for a DOHC type internal combustion engine, in which a pivot portion of an intake valve swinging arm and a pivot portion of an exhaust valve swinging arm are integrally provided on both the left and right sides of each spark plug insertion cylinder row, this cylinder The head is provided with a main oil supply passage extending in the direction of each spark plug insertion cylinder row so as to penetrate through each spark plug insertion cylinder, and an oil supply passage from the cylinder block side is provided in the main oil supply passage. An inner cylinder for forming an annular oil supply chamber communicating with the main oil supply passage is inserted into each spark plug insertion cylinder, while an inner cylinder for forming an annular oil supply chamber communicating with the main oil supply passage is inserted into each spark plug insertion cylinder. Each pivot portion of the swing arm and the exhaust valve swing arm is provided with a pivot portion technical oil supply passage communicating with the main oil supply passage or the annular oil supply chamber.

[Action/effect of the invention]

With this configuration, the oil sent from the oil supply passage in the cylinder block enters each annular oil supply chamber via the main oil supply passage, and from this annular oil supply chamber or the main oil supply passage via the pivot section oil supply passage. Each pivot portion of the intake valve swing arm and each pivot portion of the exhaust valve swing arm are supplied with oil.

In this case, there is no need to drill two long main oil supply passages in the cylinder head as in the prior art, and only one main oil supply passage is required. is drilled through each ignition plug insertion tube, and the cutting waste generated when drilling this main oil supply passage with a drill is removed from each ignition plug insertion tube when the drill penetrates each ignition plug insertion tube. Since the cutting waste is discharged into the insertion cylinder and the cutting waste can be smoothly discharged, drilling of the main oil supply passage with a drill can be done much more easily and quickly than in the case of the prior art. . In addition, the built-up part necessary to form the main oil supply passage in the cylinder head is also
Because it only needs to be provided for the one main oil supply passage,
The number of built-up parts required to form the main oil supply passage can also be reduced.

Therefore, according to the present invention, it is possible to significantly reduce the processing cost when forming a refueling passage in the cylinder head to the pivot portion of each swing arm in the cylinder head, and also to reduce the weight of the cylinder head and, by extension, the weight of the internal combustion engine. It has the effect of avoiding the increase.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 designates a cast cylinder head fastened to the upper surface of a cylinder block (not shown) in an in-line three-cylinder internal combustion engine. A combustion chamber 2 is recessed in the lower surface of the head 1 at a location corresponding to each cylinder.

Two intake ports 3 are formed for each combustion chamber 2 on one side of the cylinder head 1 across the longitudinal centerline 1a, and two exhaust ports 4 are formed for each combustion chamber 2 on the other side. , In the earthen wall of each of these intake boats 3, there is an intake valve 5 that opens and closes the opening to the combustion chamber 2 of the intake boat 3.
The support part 6 of each exhaust port 4 is also provided with an exhaust valve 7 that opens and closes the opening to the combustion chamber 2 of the exhaust boat 4.
Support portions 8 are formed respectively.

On the upper surface of the cylinder head 1, a spark plug insertion tube 10 for mounting the spark plug 9 is provided at each location of each combustion chamber 2, and on one side of each spark plug insertion tube 10, A bearing 12 for supporting the camshaft 11 for the intake valve 5 is provided on the other side, and a bearing 12 for supporting the camshaft 11 for the exhaust valve 7 is provided on the other side.
Bearings 14 for pivotally supporting 3 are each integrally provided,
Further, on the side surface of each spark plug insertion tube 10, a pivot portion 16 for the swinging arm 15 for the intake valve 5 and an exhaust valve 7 are provided.
The pivot portions 18 for the swing arms 17 are each integrally formed.

Each of these pivot parts 16.18 is provided with a sleeve j9a and a piston 19b slidably inserted into the sleeve j9a, as shown in FIG. 5, and a gap joint part 19C is provided at the upper end of the piston 19b. The lash adjusters 19 are inserted into the lash adjusters 19, and the base ends of the swing arms 15 and 17 are supported at the gap joints 19G at the upper ends of the pistons 19b of the lash adjusters 19. .

The cylinder head 1 has a longitudinal center line l.
A main oil supply passage 20 extending in the direction of the longitudinal centerline 1a is drilled at a portion above a so as to pass through each of the spark plug insertion tubes 10, and one end of this main oil supply passage 20 is It communicates with an oil supply passage (not shown) on the cylinder block side through an oil supply passage 21 formed in the cylinder head 1 . In addition, in the figure, the symbols 22, 23, and 24 are
In order to provide this main oil supply passage 20, each spark plug insertion tube 10
between each other, and the side walls 1b, l in the cylinder head 1
This is a boss part that is integrally built up between the part and c.

Each of the bearings 12, 14 has a bearing oil supply passage 25, 26 for communicating the inner surface of the bearing hole 12a, 14a in each of the bearings 12, 14 with the inside of each spark plug insertion tube 10.
are drilled in each of the pivot portions 16.18, and inside the respective pivot and throat portions 16.18 and the main oil supply passage 2.
Pivot part technical oil supply passages 27, 28 communicating with the oil supply passages 27, 28 are respectively bored, and the oil from the pivot part branch oil supply passages 27, 28 is transferred to the hydraulic chamber 19d in the sleeve 19a of the lash adjuster 19 through the check valve 19e. Passageway 19f
Introduced via.

Further, an inner cylinder 29 having sealing O-rings 30 and 31 that are closely attached to the inner surface of the spark plug insertion cylinder 10 at the upper and lower outer peripheries is inserted into each of the spark plug insertion cylinders 10, respectively.
Inside each spark plug insertion tube 10, there is a main oil supply passage 25 which communicates with the main oil supply passage 20 and a technical oil supply passage 25 for each bearing.
26, each forming an annular oil supply chamber 32 for communicating with each other,
The openings 25 a and 26 a of the technical oil supply passages 25 and 26 for each bearing to the annular oil supply chamber 32 are set at positions higher than the main oil supply passage 20 by an appropriate dimension (H).

In addition, the reference numeral 33 in the figure indicates a cylinder head cover fastened to the upper surface of the cylinder head 1 with a plurality of bolts 34, and the openings at both ends of the main oil supply passage 20 are closed with blind plugs 35 and 36. Scratch, the oil supply passage 21
The opening is also closed with a blind stopper 37.

In this configuration, a portion of the oil that enters each annular oil supply chamber 32 from the oil supply passage in the cylinder block to the cylinder via the main oil supply passage 20 in the cylinder 1 is used for bearings communicating with the annular oil supply chamber 32. Technical refueling passage 25
．． 26 to each bearing 12 of the intake valve camshaft 11 and each bearing 14 of the exhaust valve camshaft 13 to lubricate each bearing 12.14, while other oil From main oil supply passage 20 to pivot oil supply passage 27°28
to each pivot portion 16 of the intake valve swing arm 15 and each pivot portion 18 of the exhaust valve swing arm 17,
Hydraulic chambers 19d in lash adjusters 19 provided in each of the pivot portions 16, 18 are supplied with oil through passages 19f with check valves 19e.

In this case, by setting the openings 25a, 26a of the technical oil supply passages 25, 26 for each bearing to the annular oil supply chamber 32 at positions higher than the main oil supply passage 20 by an appropriate dimension (H), The air containing oil in the oil supply passage 20 is transferred to each bearing 12 from the oil supply passage 25, 26 for each bearing.
, 14, it is possible to prevent air from entering the hydraulic chamber 19d in the lash adjuster 19 of each pivot portion 16.18.

In addition, in the above embodiment, oil is supplied to each pivot portion x6=s from one main oil supply passage 20, and both camshafts 1
2.13, the bearings in each of the camshafts 12 and 13 may be oiled separately from the main oiling passage 20, and , the pivot part technical oil supply passages 27.28 to each pivot part 16.18 may be made to communicate with the annular oil supply chamber 32 instead of communicating with the main oil supply passage 20 as in the previous embodiment. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of a cylinder head, FIG. 2 is an enlarged cross-sectional view taken along the line II of FIG.
4 is an enlarged sectional view taken along line IV-IV of FIG. 1, and FIG. 5 is an enlarged sectional view of the pivot portion. 1...Cylinder head, 2...Combustion chamber, 3...
...Intake port, 4...Exhaust port, 5...Intake valve, 7...Exhaust valve, 9...Spark plug, 10...
...Ignition plug insertion tube, 11...Intake valve camshaft, 13
... Exhaust valve camshaft, 12.14 ... Bearing, 1
5.17... Swinging arm, 16.18... Pivot part, 19... Lash adjuster, 2o...
・Main oil supply passage, 25.26... Bearing oil supply passage,
27.28... Pivot section oil supply passage, 29...
...Inner cylinder, 32...Annular oil supply chamber.

Claims (1)

[Claims] (1) A combustion chamber for each cylinder arranged in a row is formed on the lower surface, while an ignition plug insertion tube is integrally provided on the upper surface for each of the combustion chambers, and each ignition In a cylinder head for a DOHC type internal combustion engine, in which a pivot part of an intake valve swinging arm and a pivot part of an exhaust valve swinging arm are integrally provided on both the left and right sides of the plug insertion cylinder row, this cylinder head A main oil supply passage extending in the direction of each spark plug insertion cylinder row is provided so as to penetrate through each spark plug insertion cylinder, and an oil supply passage from the cylinder block side is connected to this main oil supply passage. An inner cylinder for forming an annular oil supply chamber that communicates with the main oil supply passage is inserted into each of the spark plug insertion cylinders, and an inner cylinder for forming an annular oil supply chamber communicating with the main oil supply passage is inserted into each of the spark plug insertion cylinders. A cylinder head for a DOHC internal combustion engine, characterized in that each pivot part of the arm and the swinging arm for an exhaust valve is provided with a branch oil supply passage for the pivot part communicating with the main oil supply passage or the annular oil supply chamber. Refueling device.