JP2000161075A - V-type internal combustion engine - Google Patents

Abstract

(57) [Problem] To provide a V-type internal combustion engine in which the intake manifold can be arranged low without interfering with the hydraulic control valve, the size of the internal combustion engine can be reduced, and the maintainability of the hydraulic control valve is excellent. SOLUTION: In a V-type internal combustion engine in which cylinders are banked in a V-shape with each other and an intake manifold 40 is arranged between the V-banks, a hydraulic control valve 50 for controlling a hydraulic pressure supplied to a hydraulic control device is provided between the V-banks. Cylinder block 4 in
A V-type internal combustion engine disposed at an end in a crankshaft direction of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an arrangement structure of a hydraulic control valve of a V-type internal combustion engine having a hydraulic control device.

[0002]

2. Description of the Related Art In the case of a V-type internal combustion engine in which cylinders are banked in a V-shape, it is common practice to arrange an intake manifold by utilizing a space between V-banks. An example in which a variable valve timing control device is provided in such a V-type internal combustion engine and the hydraulic control valve is provided in a cylinder block is disclosed in Japanese Patent Application Laid-Open No. 5-71315.

[0003] The hydraulic control valve of the same example is provided between the V banks of the cylinder block and protrudes substantially at the center in the crankshaft direction, and an intake manifold is disposed above the hydraulic control valve.

[0004]

Therefore, it is necessary to dispose the intake manifold so as to avoid interference with the hydraulic control valve protruding between the V banks of the cylinder block. The height of the intake manifold also increases, and the size of the internal combustion engine increases. Further, since the hydraulic control valve is located between the V banks and its upper portion is covered with the intake manifold, maintenance of the hydraulic control valve is not easy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. It is an object of the present invention to provide a low intake manifold without interfering with a hydraulic control valve. Another object of the present invention is to provide a V-type internal combustion engine having excellent valve maintainability.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a V-type cylinder in which cylinders are banked in a V-shape with each other and an intake manifold is arranged between the V-banks.
In a V-type internal combustion engine, a V-type internal combustion engine is provided in which a hydraulic control valve for controlling a hydraulic pressure supplied to a hydraulic control device is disposed at an end of the cylinder block between the V banks in the crankshaft direction.

Since the hydraulic control valve is disposed at the end of the cylinder block in the crankshaft direction between the V banks, the intake manifold can be disposed between the V banks avoiding the hydraulic control valve. The size of the internal combustion engine can be reduced while the manifold is kept low.

Since the hydraulic control valve is located at the end of the cylinder block in the direction of the crankshaft and is exposed to the outside without being hidden by the intake manifold, maintenance of the hydraulic control valve is easy.

According to a second aspect of the present invention, in a V-type internal combustion engine in which cylinders are banked in a V-shape with each other and an intake manifold is arranged between the V-banks, a hydraulic pressure for controlling a hydraulic pressure supplied to a variable valve timing control device is provided. A control valve is disposed at an end of the cylinder block between the V banks on the side opposite to the timing mechanism side in the crankshaft direction, and an oil passage for supplying oil pressure to the variable valve timing control device of the cylinder head portion of each bank has a cylinder. The V-type internal combustion engine is provided with an oil path pipe provided at a head portion and having one end connected to each of the oil passages, and extends to a central portion and has the other end connected to the hydraulic control valve.

[0010] Since the hydraulic control valve is disposed at the end of the cylinder block between the V banks opposite to the timing mechanism side in the crankshaft direction, the hydraulic control valve is disposed without interfering with the timing mechanism. Therefore, the intake manifold can be arranged so as to be accommodated between the V banks, so that the intake manifold can be kept low and the size of the internal combustion engine can be reduced.

The hydraulic control valve is located at the end of the cylinder block opposite to the timing mechanism side in the crankshaft direction, and is exposed outside without being hidden by the intake manifold, so that maintenance of the hydraulic control valve is easy. .

Since the oil path pipe is used to supply oil from the hydraulic control valve to the oil passage of the cylinder head, the oil passage structure in the cylinder block can be prevented from becoming complicated, and the length of the oil passage can be reduced. Therefore, the responsiveness of the variable valve timing control device can be improved.

Here, the cylinder head portion means a portion including a so-called cylinder head and a rocker shaft holder and a cam shaft holder provided integrally or separately on the cylinder head.

The hydraulic control valve is arranged between the V banks and is supported by oil pass pipes from both sides, so that an anti-vibration effect can be expected.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIGS. The internal combustion engine according to the present embodiment is a V-type 8-cylinder internal combustion engine 1, which is mounted vertically on a vehicle with a crankshaft 10 oriented in the front-rear direction, and is divided into right and left every four cylinders around the crankshaft 10. The left and right banks 21 and 2r form a V-shape when viewed from the front.

A lower crankcase 3 and an upper cylinder block 4 which are vertically divided by a crankshaft 10
And the cylinder block 4 has V
It is formed by banking in the shape. On the left and right banks of the cylinder block 4, cylinder heads 51,
The cylinder head covers 6l and 6r are further superimposed thereon and fixed integrally. An oil pan 7 is attached below the crankcase 3.

A connecting rod 12 connects a piston 11 in each cylinder of the cylinder block 3 to a crankpin of a crankshaft 10. The left and right cylinder heads 5l, 5r each have a rocker arm type DOHC type valve operating mechanism. Intake ports 15l, 15r are arranged inside the bank, and exhaust ports 16l, 16r are arranged outside the bank. The intake valve 17 and the exhaust valve 18 are urged by valve springs 19, 19 to close the intake and exhaust valve ports, respectively.

An intake rocker arm 23 and an exhaust rocker arm 24 are swingably fitted to an intake rocker shaft 21 and an exhaust rocker shaft 22 which are supported by penetrating rocker shaft holders 20, 20 protruding from the cylinder heads 5l, 5r, respectively. The intake valve 17 and the exhaust valve 18 are slid via the hydraulic tappets 25 at the end of each valve rod to open and close the valves by the swinging of the intake rocker arm 23 and the exhaust rocker arm 24.

The intake rocker arm 23 and the exhaust rocker arm 24
Has two types of rocker arms, one for low speed and one for high speed, and is provided with a variable valve timing control device 26 that can be switched and controlled by hydraulic pressure. Intake rocker shaft 21
The switching hydraulic pressure supply passages 27 and 27 are formed inside the exhaust rocker shaft 22 and the valve timing is switched by the hydraulic pressure supplied to the switching hydraulic pressure supply passages 27 and 27, respectively.

The intake rocker shaft 21 and the exhaust rocker shaft 22 have therein the switching hydraulic supply passages 27,
The lubricating oil passages 28, 28 are formed together with the lubricating oil passages 28, 28, which are so-called two-hole rocker shafts. It is a passage.

Above the intake rocker shaft 21 and the exhaust rocker shaft 22, an intake camshaft 31 and an exhaust camshaft 32 for driving an intake rocker arm 23 and an exhaust rocker arm 24 are provided, respectively. Exhaust camshaft holder
34 and rotatably clamped.

An intake manifold 40 is disposed in a V-shaped space between the left and right banks 21 and 2r, and a spiral intake pipe 41 of the intake manifold 40 is provided with intake ports 151 and 151.
15r. The spiral-shaped intake pipe 41 is inserted into the V-shaped space between the left and right banks 21 and 2r and having the upper wall portion 4a at the center of the cylinder block 4 as the bottom wall. The intake manifold 40 is arranged so that its height is kept low as a whole.

At the front of the V-type 8-cylinder internal combustion engine 1,
Cam pulleys 33, 33 are respectively fitted to the front ends of the intake camshaft 31 and exhaust camshaft 32, and a timing belt 35 is provided between the drive pulley 34, which is fitted to the front end of the crankshaft 10, and the cam pulleys 33, 33. The rotation of the crankshaft 10 is transmitted to the rotations of the intake camshaft 31 and the exhaust camshaft 32 via the timing belt 35.

At the rear of the V-type 8-cylinder internal combustion engine 1 on the opposite side of the timing mechanism, the rear end of the recessed central portion between the left and right banks of the cylinder block 4 slightly rises to form a rear end wall 4b. A vertical spool valve 50 is fixed to the end wall 4b and protrudes upward.

The block main gallery is directed to the center upper wall 4a of the cylinder block 4 in the direction of the crankshaft.
A communication passage 52 formed obliquely from the rear end of the block main gallery 51 to the end wall 4b is connected to a supply hydraulic port of the spool valve 50.

A connecting member 53 is provided on the rear side of the spool valve 50.
Are integrally fixed, and two oil path pipes 54 and 55 extend left and right from the left and right side surfaces of the connecting member 53 in parallel. The spool valve 50 has a switching hydraulic outlet for switching valve timing and a relief oil outlet.
53 separates the oil from each outlet to the left and right, and flows into the oil pass pipes 54 and 55.

On the other hand, connecting members 56, 56 are integrally fixed to the rear surfaces of the left and right cylinder heads 5l, 5r on the intake port side, respectively. The other end of 55 is connected to left and right connecting members 56, 56, respectively.

As shown in FIG. 4, the inside of the cylinder heads 51 and 5r and the inside of the rocker shaft holder 20 which supports the rear ends of the intake rocker shaft 21 and the exhaust rocker shaft 22, are provided as shown in FIG.
A switching hydraulic communication passage 60 that communicates between the switching hydraulic supply passages 27 and 27 provided inside each of the 22 and a lubricating oil communication passage 61 that communicates between the lubricating oil passages 28 and 28 are formed,
Communication passages 62 and 63 extend to the connecting member 56 from the intake hydraulic rocker shaft 21 side of the switching hydraulic communication passage 60 and the lubricating oil communication passage 61, respectively.

Accordingly, the hydraulic pressure from the switching hydraulic outlet of the spool valve 50 branches right and left at the connecting member 53, passes through the oil pass pipes 54, 54, respectively, and connects the left and right connecting members 56, 56.
From the left and right cylinder heads 5l, 5r and the communication passages 62, 62 in the rocker shaft holders 20, 20, and then into the switching hydraulic pressure supply passages 27, 27 of the intake rocker shafts 21, 21, and at the same time, switch hydraulic communication passages 60, The hydraulic pressure is also supplied to the variable valve timing devices 26 via the switching hydraulic pressure supply passages 27, 27 of the exhaust rocker shafts 21, 21 via 60. The spool valve 50 switches between a low pressure and a high pressure by driving a solenoid and supplies it to the variable valve timing device 26 to switch the valve timing.

Similarly, the relief oil flowing out from the relief oil outlet of the spool valve 50 branches right and left by the connecting member 53, passes through the oil path pipes 55, 55, and from the left and right connecting members 56, 56 to the left and right cylinder heads. 5l, 5r and the communication passages 63, 63 in the rocker shaft holders 20, 20, and then the lubricating oil passages 28,
At the same time, the lubricating oil passes through the lubricating oil communication passages 61, 61, and also enters the lubricating oil passages 28, 28 of the exhaust rocker shafts 21, 21, and is supplied to the cam pieces, the rocker arms 23, 24, and the like for lubrication.

The V-type eight-cylinder internal combustion engine 1 has the above-described structure.
Since it stands on the rear end wall 4b of the cylinder block 4 between 2r, the intake manifold is avoided while avoiding the spool valve 50.
40 is disposed between the left and right banks 21 and 2r so that the lower end thereof enters the V-bank until the lower end approaches the upper wall 4a of the center of the cylinder block 4, and the height of the intake manifold 40 is suppressed to be low. The size of the engine 1 is reduced.

The spool valve 50 is disposed at the rear end opposite to the front end of the cylinder block 4 where the timing mechanism such as the timing belt 35 is disposed. The timing mechanism or the spool valve 50 can be disposed at the front and rear ends without protruding greatly, and the size of the internal combustion engine 1 can be suppressed.

The spool valve 50 is connected to the cylinder block 4
And is exposed to the outside without being hidden by the intake manifold 40, so that the spool valve 50
Is easily maintained.

From the spool valve 50 to the cylinder head 5
Since the external oil path pipes 54, 54 are used to supply the hydraulic pressure to the switching hydraulic supply passages 27, 27 of 1, 5r, the oil passage structure in the cylinder block 4 can be simplified, An oil passage having a short oil passage length can be set without being restricted by the shape of the cylinder block 4, and the transmission speed of the oil pressure can be increased to improve the responsiveness of the variable valve timing control device 26.

A connecting member 53 fixed to a spool valve 50 provided on the central rear end wall 4b of the cylinder block 4;
The oil path pipes 54 and 55 connect the connecting members 56 fixed to the rear surfaces of the rear end rocker shaft holders 20 and 20 of the left and right cylinder heads 5l and 5r.
The oil pass pipes 54, 55 can be disposed short along the rear end face of the oil pass pipe.

The spool valve 50 is connected to the cylinder block 4
The rear end wall 4b is erected and the left and right sides are supported by two parallel oil pass pipes 54 and 55, respectively, so that the vibration of the spool valve 50 is suppressed. The oil pass pipes 54 and 55 are curved in parallel to connect the connecting members 53 and 55, respectively.
The connection between 56 enables absorption of thermal expansion.

In the present embodiment, two oil path pipes 54 and 55 extend from the spool valve 50 to the left and right, respectively. However, the valve timing switching mode is increased and the switching hydraulic supply passage is increased. Even so, it is possible to easily cope with the problem by increasing the number of oil pass pipes, and it is possible to avoid that the oil passage structure in the cylinder block must be complicated or large.

The oil pass pipe is used to supply a hydraulic pressure for switching valve timing as in the present embodiment, and is also applied to lubrication of a valve train, oil supply to a hydraulic tappet, and the like. be able to.

[Brief description of the drawings]

FIG. 1 is a vertical front view of an internal combustion engine according to one embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is a perspective view of a main part partially seen through;

[Explanation of symbols]

1: V-type 8-cylinder internal combustion engine, 2l, 2r: left and right banks, 3
... Crankcase, 4 ... Cylinder block, 5l, 5r
... Cylinder head, 6l, 6r ... Cylinder head cover, 7 ... Oil pan, 10 ... Crankshaft, 11 ... Piston, 12 ... Connecting rod, 15L, 15R ... Intake port, 16L, 16R ... Exhaust port, 17 ... Intake valve, 18 ... exhaust valve, 19 ... valve spring, 20 ... rocker shaft holder, 21 ... intake rocker shaft, 22 ... exhaust rocker shaft, 23 ... intake rocker arm, 24 ... exhaust rocker arm, 25 ... hydraulic tappet, 26 ... variable valve timing device, 27 ... Switching hydraulic supply passage, 28 ... Lubricant oil passage, 31 ... Intake camshaft, 32 ... Exhaust camshaft, 33 ... Cam pulley, 34 ... Drive pulley, 35 ... Timing belt, 40 ... Intake manifold, 41
... intake pipe, 50 ... spool valve, 51 ... block main gallery, 52 ... communication path, 53 ... connecting member, 54, 55 ... oil path pipe, 56 ... connecting member, 60 ... switching hydraulic communication path, 61
... Lubrication oil communication passage, 62, 63 ... Communication passage.

Claims (2)

[Claims] In a V-type internal combustion engine in which cylinders are banked in a V-shape with each other and an intake manifold is arranged between the V-banks, a hydraulic control valve for controlling a hydraulic pressure supplied to a hydraulic control device is provided between the V-banks. A V-type internal combustion engine, which is disposed at an end of a cylinder block in a crankshaft direction. 2. In a V-type internal combustion engine in which cylinders are banked in a V-shape with each other and an intake manifold is arranged between the V-banks, a hydraulic control valve for controlling a hydraulic pressure supplied to a variable valve timing control device is provided in the V-bank. Oil passages are provided in the cylinder head portions, which are arranged at the end of the cylinder block opposite to the timing mechanism side in the crankshaft direction and supply hydraulic pressure to the variable valve timing control device of the cylinder head portion of each bank. An V-type internal combustion engine, wherein an oil pass pipe having one end connected to each of the oil passages extends to the center and the other end is connected to each of the hydraulic control valves.