JP3498821B2 - Oil passage structure of internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control oil passage for supplying oil discharged from an oil pump to a variable valve timing device through an oil control valve, and to control the oil passage. The present invention relates to an oil passage structure of an internal combustion engine having a lubricating oil passage for supplying to a cam journal of a cylinder head. 2. Description of the Related Art In a four-stroke engine, for example, a technique of changing the opening / closing timing of a valve in accordance with the engine speed in order to increase the middle / low speed torque is known. (Hereinafter abbreviated as VVT) has been proposed and is already in practical use. [0003] By the way, there is a VVT whose operation is controlled by oil pressure. In an internal combustion engine equipped with this kind of VVT, oil discharged from an oil pump is controlled by an oil control valve (hereinafter abbreviated as OCV). , And a lubricating oil passage for supplying the oil to the cam journal of the cylinder head. However, in a conventional internal combustion engine, a control oil passage and a lubrication oil passage are provided on the same side of the engine (usually on the front side where a VVT is provided). Therefore, there is a problem that the oil passage structure is complicated and the lateral width and the overall length of the engine are long. The present invention has been made in view of the above problems, and an object thereof is to realize a rational arrangement of a control oil passage and a lubrication oil passage to reduce the lateral width and the overall length of an internal combustion engine. It is an object of the present invention to provide an oil passage structure for an internal combustion engine that can achieve compactness and compactness. [0006] In order to achieve the above object, the present invention according to claim 1 is an invention wherein an oil pump is provided with a main unit.
An oil passage for an internal combustion engine having a control oil passage for supplying oil discharged to the il gallery through an oil control valve to a variable valve timing device, and a lubrication oil passage for supplying the oil to a cam journal of a cylinder head. In the structure, the main oil
The main oil is formed in the cylinder block.
From the gallery, the control oil passage and the lubrication oil passage
Ru provided distributes them around the engine by branching the
With the oil removably mounted on the cylinder head.
The control oil passage is connected to the
From the oil passage to the cam journal on the rear side.
The oil supplied is supplied to the oil formed in the cam shaft in the axial direction.
Supply to other cam journals through passages
Characterized in that way the. Therefore, according to the first aspect of the present invention, since the control oil passage and the lubrication oil passage are separately provided at the front and rear of the engine, the structure of the oil passage is simplified, and the internal combustion engine has a simple structure. The size can be reduced by reducing the width and the overall length. Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of a cylinder head of an internal combustion engine having an oil passage structure according to the present invention, FIG. 2 is a side view of the cylinder head (a view in the direction of arrow A in FIG. 1), and FIG.
Is a front side front view of the cylinder head (viewed from arrow B in FIG. 1).
FIG. 4 is a front view of a rear side of the cylinder head (a view in the direction of arrow C in FIG. 1), FIG. 5 is a cross-sectional view taken along the line DD of FIG. 1, FIG. 7 is a bottom view of the cam cap, FIG. 8 is a sectional view taken along line EE of FIG. 6, and FIG.
FIG. 10 is a block diagram schematically showing an oil passage structure according to the present invention. The internal combustion engine according to the present embodiment is a four-stroke in-line four-cylinder engine, and its cylinder head 1 has an intake port 2 and an exhaust port 3 for each cylinder as shown in FIG. Each of the intake ports 2 and the exhaust ports 3 is open to a combustion recess 4 formed on the bottom surface of the cylinder head 1 (joining surface with a cylinder block (not shown)). The valve is opened and closed at an appropriate timing by a valve and an exhaust valve (both not shown). As shown in FIGS. 2 and 5,
An injector mounting hole 5 communicating with the intake port 2 of each cylinder is formed in an upper portion on the intake side of the cylinder head 1, and an injector (not shown) for fuel injection is screwed into the injector mounting hole 5. Also, as shown in FIG.
On the upper surface of the cylinder, four lifter holes 6, 7 into which the respective valve lifters of the intake valve and the exhaust valve are to be fitted are formed, two for each cylinder, that is, four in total. Further, as shown in FIGS. 1 and 5, a plug hole 8 opening to the combustion recess 4 is formed for each cylinder in the center of the cylinder head 1 in the width direction. Is screwed with a spark plug (not shown). In FIG. 1, reference numeral 9 denotes a sand hole formed on the upper surface of the cylinder head 1, and 10 denotes a bolt hole through which a head bolt for attaching the cylinder head 1 to a cylinder block (not shown) is inserted. The intake valve and the exhaust valve are provided on an intake camshaft 11 (FIGS. 6 and 7) rotatably disposed in the length direction (left and right directions in FIG. 1) on the intake side and the exhaust side of the upper part of the cylinder head 1. 10), and are driven by an exhaust cam shaft (not shown). Thus, in the engine according to the present embodiment, a VVT (variable valve timing device) 12 (see FIG. 10) is provided at the front end of the intake camshaft 11, as shown in FIG. Sprocket 1 attached to the VVT 12 and the front end of the exhaust camshaft.
An endless chain 15 is wound between the sprocket 3 and an end of a crankshaft (not shown). Accordingly, when the engine is driven, the crankshaft rotates through the sprocket 14, the chain 15, the cam sprocket 13 and the VVT 12 to rotate the intake camshaft 1
1 and the exhaust camshaft are respectively rotated and driven, and the intake valve and the exhaust valve are respectively opened and closed at appropriate timing to perform a required gas exchange in the cylinder of each cylinder. Thus, the VVT 12 is controlled by the hydraulic pressure to advance or retard the opening / closing timing of the intake valve, thereby increasing, for example, low / medium speed torque. The intake camshaft 11 has a total of four cam journals 16 (see FIGS. 1 and 5) formed on the upper surface of the cylinder head 1 for each cylinder, and a front end (left side in FIG. 1). It is rotatably supported by one wide cam journal part 17 formed in the part. Each of the cam journal portions 16 and 17 has a cam cap bolt hole 18 formed on both sides thereof.
6, a cam cap (not shown) is attached, and the other cam journal portion 17 is similarly attached with a cam cap 20 shown in FIGS. As shown in FIG. 1, the cam journal 17 has two oil grooves 21 and
2 are formed. Similarly, an exhaust camshaft (not shown) is formed on the upper surface of the cylinder head 1 at a total of four cam journals 23 (see FIGS. 1 to 5) formed for each cylinder and at the front end. A single wide cam journal portion 24 is rotatably supported. A cam cap (not shown) is attached to each of the cam journal portions 23 and 24 by a cam cap bolt (not shown) screwed into a cam cap bolt hole 25. Have been. Next, the oil passage structure according to the present invention will be described. In the engine according to the present embodiment,
As shown in FIG. 2, the oil collected in an oil pan 26 provided below the engine is pressurized by an oil pump 27 and supplied to various parts.
The drive of the VT 12 is controlled, and each sliding portion is lubricated. That is, the engine according to this embodiment includes:
A control oil passage 30 for supplying oil discharged from the oil pump 27 and passing through the oil filter 28 to the VVT 12 through an OCV (oil control valve) 29 shown in FIG. 3 and a cam journal portion of the cylinder head 1 A lubricating oil passage 31 is provided for supplying the lubricating oil passage 31 to the control oil passage 16, 17, 23, and 24. As shown in FIG. ). Here, the structure of the control oil passage 30 and the lubrication oil passage 31 will be described. As shown in FIG. 2, oil passages 33 and 34 are branched from a main oil gallery 32 formed in a cylinder block (not shown).
Numeral 34 denotes an oil passage 35 which rises upward in the cylinder block and is formed vertically below the cylinder head 1.
36 respectively. The oil passage 37 derived from the oil filter 28 is connected to the oil passage 3.
It is connected to the main oil gallery 32 at points 3 to a (points from the oil passages 34 to b), and a <b in the present embodiment as shown in the figure. By the way, in the cylinder head 1,
The oil passage 35 is connected to an oil passage 38 formed horizontally toward the front side.
Reference numeral 8 is connected to an oil filter 39 which is removably mounted on the front end of the cylinder head 1. As shown in FIGS. 1 and 3, the oil filter 39 is connected to an oil passage 40 that is formed horizontally outward (toward the front side in FIG. 1).
The oil passage 41 is formed so as to rise vertically upward (see FIGS. 2 and 3). On the other hand, as shown in FIG. 3, the mounting seat 42 protrudes from the front end face of the cylinder head 1 on the intake side.
The OCV 29 is mounted on the cylinder head 1 (see FIG. 1), and an oil passage 43 connected to the OCV 29 is formed horizontally above the cylinder head 1.
3, the oil passage 41 is connected. And
From the oil passage 43, an advance oil passage 44 and a retard oil passage 45 are set up obliquely upward (see FIGS. 2 and 3).
As shown in FIG. 1, the cam journal portion 17 is open to the mating surface with the cam cap 20 and outside the outer cam cap bolt hole 18 (on the near side in FIG. 1). still,
As shown in FIG. 1, the oil passages 41, 44, 45 are formed outside the outer cam cap bolt holes 18. On the other hand, as shown in FIGS. 6 to 9, the cam cap 20 is formed with journal portions 46 for receiving the upper half of the intake camshaft 11, and cam cap bolt holes are formed on both sides thereof. 47 is penetrated in the vertical direction.
The journal portion 46 is formed with two oil grooves 48 and 49 for the advance and the retard along the journal. The cam cap bolt hole 47 is formed in the bottom surface of the cam cap 20 (the mating surface with the cylinder head 1).
The two oil grooves 50 and 51 for advance and retard are formed to avoid the oil groove.
8 and 49 respectively. In the present embodiment, since the cam cap 20 is formed by die casting, the oil grooves 48 to 51 are formed at the same time as the forming, and it is not necessary to form them by post-processing (machining). Costs can be reduced. As shown in FIG. 6, the intake camshaft 11 has two oil passages 52, 53 for advance and retard.
Are formed in parallel to each other in the axial direction, and the oil passages 52 and 53 are formed in oil passages 54 and 55 formed in the radial direction.
And communicates with the oil grooves 21, 22 and 48, 49 through the VVT 12 and is connected to the advance and retard oil chambers S1, S2 of the VVT 12 shown in FIG. The configuration of the control oil passage 30 described above is schematically shown in a block diagram shown in FIG. Next, the structure of the lubricating oil passage 31 in the cylinder head 1 will be described. As shown in FIGS. 1 and 2, the oil passage 36 formed vertically below the cylinder head 1 is formed horizontally toward the rear side (to the right in FIGS. 1 and 2). The oil passage 56 is connected to an oil passage 58 formed perpendicularly to an oil passage seat 57 projecting from the rear end surface of the cylinder head 1.
It is connected to the. On the other hand, an oil passage 59 is formed horizontally above the oil passage seat 57, as shown in FIGS. 1 to 4, and the oil passage 58 is connected to the oil passage 59. From the oil passage 59, two oil passages 60, 61 are directed toward the front side (left side in FIG. 1), and the cam journal portions 16, 2 on the rear side (rightmost end in FIG. 1).
3 extends horizontally to the side. As shown in FIG. 5, small-diameter oil passages 62 and 63 are formed diagonally upward from the oil passages 60 and 61 toward the outside.
6 and 23 respectively. The four-stroke engine according to the present embodiment is a water-cooled engine, and as shown in FIG.
A water jacket 64 is formed in the cylinder head 1, and cooling water supplied from the cylinder block side through the cooling water passage 65 and other cooling water passages cools the cylinder head 1 in a process of flowing through the water jacket 64. As shown in FIG. 4, the cooling water is discharged from a cooling water outlet 66 opened at the rear side (the side where the lubricating oil passage 31 is provided) of the cylinder head 1 and guided to a radiator (not shown). When the engine is driven and the oil pump 27 is driven by a part of the engine power, the oil discharged from the oil pump 27 passes through the oil filter 28 and is purified. The oil is supplied to the VVT 12 through a control oil passage 30 to be used for drive control of the VVT 12, and is guided to the cam journals 16 and 23 through a lubrication oil passage 31, and the intake cam shaft 11 and an exhaust cam (not shown) Used for shaft lubrication. That is, the oil flowing through the control oil passage 30 is supplied to the oil passages 35 and 3 in the cylinder head 1.
8. The oil is guided to the OCV 29 through the oil filter 39 and the oil passages 40 and 41, and flows from the OCV 29 through the oil passages 44 and 45 for advancing and retarding to the cam cap 20. In the cam cap 20, FIG.
As shown by arrows in FIG. 7, oil flows through oil grooves 50 and 51 for advancing and retarding, and oil flows from oil grooves 48 and 49 formed in the journal portion 46 into the intake camshaft 1.
The oil is guided to oil passages 52, 53 for advancing and retarding through oil passages 54, 55 formed in the cylinder 1, and is supplied to the oil chambers S1, S2 of the VVT 12 through the oil passages 52, 53, respectively. You. The OCV 29 controls oil in accordance with the engine speed, for example, and controls the oil chambers S1, S
2 is selectively supplied with oil, whereby the opening / closing timing of the intake valve is advanced or retarded, respectively, thereby increasing, for example, medium / low speed torque. On the other hand, the oil flowing through the lubricating oil passage 31 flows through the oil passages 36 and 5 in the pair of cylinder heads.
6 and 58, the oil guide 59 is guided to an oil passage 59, a part of which is guided to a cam journal 16 on the intake side through an oil passage 60 to lubricate the intake camshaft 11, and the rest passes through an oil passage 61. Then, it is guided to the cam journal portion 23 on the exhaust side to be used for lubrication of the exhaust cam shaft. The intake camshaft 11
An oil passage (not shown) is formed in each of the exhaust camshafts in the axial direction.
The oil supplied to the cam journals 16 and 23 is supplied to the other cam journals 16 and 23 through the oil passages. In the above, in the present embodiment, the control oil passage 30 and the lubrication oil passage 31 are separately provided before and after the engine, so that the rational arrangement of the oil passages 30 and 31 is realized and the oil passage The structure is simplified,
The width and the total length of the internal combustion engine are reduced, and the size of the engine is reduced. In this embodiment, since the magnitude relationship between the distances a and b shown in FIG. 2 is set to a <b, the length of the control oil passage 30 is shorter than the length of the lubrication oil passage 31. As a result, the amount of oil supplied to the VVT 12 increases, and the rise of the VVT 12 at the time of starting the engine can be accelerated. Conversely, if a> b is set, the length of the lubricating oil passage 31 becomes shorter than the length of the control oil passage 30 and the amount of oil supplied to the cam journals 16 and 23 increases. Lubrication of the intake camshaft 11 and the exhaust camshaft can be started up quickly. Further, in the present embodiment, the cooling water outlet 66
Formed on the lubricating oil passage 31 side (rear side) of the cylinder head 1, the oil flowing through the lubricating oil passage 31 is more effectively warmed by the high-temperature cooling water. Although the lubricating oil can be quickly raised to a desired temperature, the above description has been particularly made of the case where the present invention is applied to a water-cooled four-stroke in-line four-cylinder engine, but the present invention is applicable to any other type. Is applicable to the 4-cycle engine. As is apparent from the above description, claim 1
According to the invention described above, since the control oil passage and the lubrication oil passage are separately provided at the front and rear of the engine, the structure of the oil passage is simplified, and the width and the total length of the internal combustion engine can be reduced to make the engine compact. The effect that can be obtained is obtained. [0046]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a cylinder head of an internal combustion engine having an oil passage structure according to the present invention. FIG. 2 is a side view (a view in the direction of arrow A in FIG. 1) of a cylinder head of the internal combustion engine having the oil passage structure according to the present invention. FIG. 3 is a front side front view (a view in the direction of arrow B in FIG. 1) of a cylinder head of the internal combustion engine having the oil passage structure according to the present invention. 4 is a rear side front view (a view in the direction of arrow C in FIG. 1) of a cylinder head of the internal combustion engine having the oil passage structure according to the present invention. FIG. 5 is a sectional view taken along line DD of FIG. 1; FIG. 6 is a front view of the cam cap. FIG. 7 is a bottom view of the cam cap. FIG. 8 is a sectional view taken along line EE of FIG. 6; FIG. 9 is a sectional view taken along line FF of FIG. 6; FIG. 10 is a block diagram schematically showing an oil passage structure according to the present invention. [Description of Signs] 1 Cylinder head 12 Variable valve timing device (VVT) 16, 23 Cam journal unit 27 Oil pump 29 Oil control valve (OCV) 30 Control oil passage 31 Lubrication oil passage 66 Cooling water outlet

Claims (1)

(57) [Claims] [Claim 1] From an oil pump to a main oil gallery
A control oil passage for supplying the variable valve timing system oil through the oil control valve to be discharged to, in the oil passage structure for an internal combustion engine with a lubricating oil passage for supplying the oil to the cam journal portion of the cylinder head , Forming the main oil gallery in the cylinder block
The main oil gallery is connected to the control oil passage.
By branching the lubricating oil passage and provided by distributing these around the engine Rutotomoni, Removable cylinder head
The control oil passage in the oil filter
And each one on the rear side from the lubricating oil passage
The oil supplied to the cam journal is supplied to the cam shaft in the axial direction.
Through the oil passage formed in the other cam journal
Oil passage structure for an internal combustion engine, characterized in that it has to be supplied respectively to the.