JPH05306613A - Breather of vee-engine - Google Patents

Abstract

PURPOSE:To improve the breathing performance of a vee-engine and effectively utilize an engine room by arranging a direct ignition coil and a breather chamber on one of two cylinder head covers and arranging a breather chamber and a blow-by chamber on the other one. CONSTITUTION:On the top of a V-shaped cylinder block 4 of a vee-engine 2, two cylinder heads 6 and 8, and two cylinder head covers 10 and 12 are installed. In this case, on only either cylinder head cover 10 or 12, a direct ignition coil 84 is arranged. In the cylinder head cover 10 on which the direct ignition coil is arranged, a first breather chamber 86 is arranged. In addition, in the other cylinder head cover 12, a second breather chamber 88 and a blow-by gas chamber 90 are arranged. By this constitution, the breathing performance of the vee-engine 2 is improved and the space in an engine room is effectively utilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather device for a V-type engine, and more particularly, it mounts two cylinder heads and two cylinder head covers on the upper part of a V-shaped cylinder block and directly mounts them on the cylinder head cover. The present invention relates to a breather device for a V-type engine provided with an ignition coil.

[0002]

2. Description of the Related Art As an engine, there are an engine having cylinders arranged in series, an engine having cylinders opposed to each other, a V-type engine having cylinders arranged in a V shape, and the like.

In the engine, blow-by gas leaks from the combustion chamber through the gap between the piston and the cylinder wall into the crank chamber. Since HC of the unburned gas is contained in the components of the blow-by gas, it is necessary to guide the blow-by gas to the combustion chamber again for re-combustion. For this purpose, the engine is provided with a blow-by gas returning device.

Some of the V-type engines are shown in FIGS. 4 and 5. This V-type engine 102 has first and second cylinder heads 106, 1 above the cylinder block 104.
08 and the first and second cylinder head covers 110, 112
Are placed respectively, and the first and second cylinder banks 114,
116 are formed.

A bearing cap 118 is connected to the lower portion of the cylinder block 104, and an oil pan 120 is attached to the lower portion of the bearing cap 118.

Between the lower part of the cylinder block 104 and the upper part of the bearing cap 118, the crankshaft 1
24 is pivotally supported.

Further, the first cylinder head 106 has a first spark plug 146 attached to the central portion of the first combustion chamber 138, and the second cylinder head 108 has
A second spark plug (not shown) is provided at the center of the second combustion chamber 140.
Is installed.

Further, as a blow-by gas returning apparatus for a V-type engine, as disclosed in Japanese Patent Application Laid-Open No. 2-81910, a blow-by gas outlet passage is formed separately from each valve operating chamber so that one end is in the crank chamber and the other end is in the crank chamber. Has an independent passage structure that opens to the intake passage on the downstream side of the throttle valve, and a third fresh air introduction passage that connects the valve chamber of the other bank of the left and right banks to the intake passage on the upstream side of the throttle valve, and the other side. A fourth fresh air introducing passage that connects the valve operating chamber of the bank and the crank chamber is provided, and an oil separator chamber having a smaller capacity than the first fresh air introducing passage is interposed in the third fresh air introducing passage and the minimum disconnection In some cases, the area was set smaller than that of the first fresh air introduction passage.

[0009]

By the way, in the breather device for the conventional V-type engine, as shown in FIGS. 4 and 5, the first and second cylinders forming the first and second cylinder banks 114 and 116 are formed. Direct ignition coil 1 corresponding to each cylinder on the upper surface of head covers 110 and 112
84 are attached respectively.

Further, the V-type engine 102 has a breather chamber 186 formed in the first cylinder head cover 110 and the second cylinder head cover 1
A blow-by gas chamber 190 is formed inside 12. The breather hose 202 is connected to the breather chamber 186, and the blow-by hose 204 is connected to the blow-by gas chamber 190. A PCV valve (not shown) is arranged on the blow-by gas hose 204.

However, as described above, since the direct ignition coils 184 are attached to the upper surfaces of the first and second cylinder head covers 110 and 114, respectively, the capacities of the breather chamber 186 and the blow-by gas chamber 190 are reduced, It was not possible to sufficiently secure the oil separation function (gas-liquid separation function) with the blow-by gas chamber 190.

Further, the first cylinder head cover 11
0 is provided with a breather chamber 186, and the blow-by gas chamber 1 is provided in the second cylinder head cover 112.
PCV valve (not shown) because 90 was formed
Under the condition that does not operate, the blow-by gas is stagnated in the blow-by gas chamber 190 and the pressure in the second cylinder head cover 112 is increased, which may cause oil leakage or oil deterioration, which is disadvantageous in practical use. There was an inconvenience.

[0013]

Therefore, according to the present invention, in order to eliminate the above-mentioned inconvenience, two cylinder heads and two cylinder head covers are mounted on the upper portion of a V-shaped cylinder block, respectively. In a V-type engine in which a direct ignition coil is arranged in the cylinder head cover, the direct ignition coil is arranged in only one of the two cylinder head covers, and the first ignition is provided in one cylinder head cover in which the direct ignition coil is arranged. A breather chamber is provided and a second breather chamber and a blow-by gas chamber are provided in the other cylinder head cover.

[0014]

According to the invention as described above, when the V-type engine is driven, the blow-by gas generated in the lower part of the V-type engine is introduced into the breather chamber and the blow-by gas chamber, and after gas-liquid separation is performed. Blow-by gas is supplied to the intake system and oil is returned inside the V-type engine, improving the breather performance of the V-type engine.

[0015]

Embodiments of the present invention will now be described in detail and specifically with reference to the drawings.

1 and 2 show an embodiment of the present invention. In FIG. 2, reference numeral 2 is a V-type engine. This V-type engine 2 has a first,
The second cylinder heads 6 and 8 and the first and second cylinder head covers 10 and 12 are placed to form the first and second cylinder banks 14 and 16.

A bearing cap 18 is connected to the lower portion of the cylinder block 4, and an oil pan 20 is attached to the lower portion of the bearing cap 18.

The lower part of the cylinder block 4 and the upper part of the bearing cap 18 form a crank chamber 22. Inside the crank chamber 22, a crankshaft 24 is provided, which is supported by the lower portion of the cylinder block 4 and the upper portion of the bearing cap 18.

A first member is provided inside one side of the cylinder block 4.
The cylinder 26 is formed, and the second cylinder 28 is formed inside the other side of the cylinder block.
A first piston 30 is provided reciprocally in the first cylinder 26, and a second piston 32 is provided reciprocally in the second cylinder 28.

The first and second pistons 30 and 32 are connected to the crankshaft 24 via first and second connecting rods 34 and 36.

The first cylinder head 6, the first piston 30, and the first cylinder 26 form a first combustion chamber 38, and the second cylinder head 8 and the second piston 32.
A second combustion chamber 40 is formed by the second cylinder 28 and the second cylinder 28.

The first cylinder head 6 has a first intake port (not shown) communicating with the first combustion chamber 38. The first intake manifold 4 has a first intake port 4
The first intake passage 44 formed by 2 is communicated.

A first exhaust port (not shown) communicating with the first combustion chamber 38 is formed in the first cylinder head 6, and a first exhaust port (not shown) is formed at the center of the first combustion chamber 38.
A spark plug 46 is attached.

A second intake port 48 communicating with the second combustion chamber 40 is formed in the second cylinder head 8. A second intake passage 52 formed by a second intake manifold 50 communicates with the second intake port 48.
The second intake port of the second intake port 48 is the second intake valve 5
It is opened and closed by 4.

A second exhaust port 56 communicating with the second combustion chamber 40 is formed in the second cylinder head 8. A second exhaust passage (not shown) formed of a second exhaust manifold is connected to the second exhaust port 56. The second exhaust port of the second exhaust port 56 is opened and closed by a second exhaust valve 58. A second spark plug (not shown) is attached to the second cylinder head 8 at the center of the second combustion chamber 40.

Further, on the upper part of the first cylinder head 6,
First intake and exhaust cam shafts 60 and 62 for operating a first intake valve (not shown) and a second exhaust valve (not shown) are arranged in parallel. The first intake cam shaft 60 is pivotally supported by the first cylinder head 6 and the first intake cam housing 64.
The first intake cam housing 64 is attached to the first cylinder head 6 by the first intake cam housing tightening bolts 66.
It is fixed to.

Furthermore, the first exhaust cam shaft 62 is pivotally supported by the first cylinder head 6 and the first exhaust cam housing 68. First exhaust cam housing 68
Is fixed to the first cylinder head 6 by a first exhaust cam housing tightening bolt 70.

Further, on the upper part of the second cylinder head 8, second intake / exhaust cam shafts 72, 74 for operating the second intake / exhaust valves 54, 58 are arranged in parallel. The second intake cam shaft 72 is pivotally supported by the second cylinder head 8 and the second intake cam housing 76. The second intake cam housing 76 is fixed to the second cylinder head 6 with a second intake cam housing tightening bolt 78.

The second exhaust cam shaft 74 is pivotally supported by the second cylinder head 8 and the second exhaust cam housing 80. This second exhaust cam housing 80
Is fixed to the second cylinder head 8 by a second exhaust cam housing tightening bolt 82.

Further, the direct ignition coil 84 is provided only on one of the two first and second cylinder head covers 10 and 12, for example, only on the first cylinder head cover 10, and the direct ignition coil 84 is provided. In the first cylinder head cover 10
A breather chamber 86 is provided, and a second breather chamber 88 and a blow-by gas chamber 90 are provided in the other second cylinder head cover 12.

More specifically, the first cylinder head cover 1
0 is provided with a mounting recess 92, a direct ignition coil 84 is mounted in the mounting recess 92, and a first breather chamber 86 is provided in the first cylinder head cover 10.
To form. The first breather chamber 86 is connected to the intake system by a first breather hose (not shown).

A second breather chamber 88 and a blow-by gas chamber 90 are provided in the second cylinder head cover 12. The second breather chamber 88 is connected to the intake system by a second breather hose (not shown). The blow-by gas chamber 90 has a gas-liquid separation function of separating the oil mixed in the blow-by gas and the blow-by gas, and is connected to the intake system by a blow-by gas hose (not shown). A PCV valve is provided in the middle of this blow-by gas hose.

Next, the operation of this embodiment will be described.

When the V-type engine 2 is driven, the blow-by gas generated in the crank chamber 22 of the V-type engine 2 is generated by the first and second breather chambers 86 and 88 and the blow-by gas chamber 9.
0 and is separated into gas and liquid in the blow-by gas chamber 90, blow-by gas is supplied to the intake system through a blow-by gas hose (not shown) and a PCV valve (not shown), and oil is V-shaped. It has been returned in the engine 2.

Further, in an operation in which the PCV valve (not shown) does not operate, blow-by gas is discharged from the first and second breather chambers 86, 88 to the intake system via the first and second breather hoses (not shown), The pressure rises in the first and second cylinder heads 6 and 8 are prevented, and the breather performance of the V-type engine is improved.

As a result, the breather performance of the V-type engine 2 can be improved, and the first and second breather gases are stagnant.
It is possible to prevent the pressure in the cylinder heads 6 and 8 from rising and prevent oil leakage of the V-type engine 2 in advance.
It is possible to prevent deterioration of oil, which is practically advantageous.

Further, the first cylinder head cover 10
By arranging the direct ignition coil 84 only in the above, the space in the engine room (not shown) can be effectively used, which is practically advantageous.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the above-described embodiment, the first
Although the direct ignition coil is arranged only on the cylinder head cover, it is also possible to dispose and use the direct ignition coil only on the second cylinder head cover.

Further, in the above-described embodiment, the first cylinder head cover 10 and the second cylinder head cover 12 on which the direct ignition coil 84 is arranged are formed in substantially the same shape, but as shown in FIG. In order to effectively use the space above the second cylinder head cover 12, which is a space in the engine room (not shown), the second cylinder head cover 12 can be formed larger than the first cylinder head cover 10 and used.

As a result, the space in the engine room (not shown) can be effectively used, and the capacity of the second breather chamber 88 in the second cylinder head cover 12 can be made large so that the breather performance of the V-type engine 2 can be improved. Can be improved.

[0042]

As is apparent from the above detailed description, according to the present invention, the direct ignition coil is provided only in one of the two cylinder head covers, and the one cylinder head cover in which the direct ignition coil is provided. Since the first breather chamber is provided inside and the second breather chamber and the blow-by gas chamber are provided inside the other cylinder head cover, the breather performance of the V-type engine can be improved, and the pressure in the cylinder head due to the stagnant blow-by gas can be improved. Of the oil can be prevented, oil leakage can be prevented, and deterioration of the oil can be prevented, which is practically advantageous. Further, by disposing the direct ignition coil on only one of the two cylinder head covers, the space in the engine room can be effectively used.

[Brief description of drawings]

FIG. 1 is a sectional view of a V-type engine showing an embodiment of the present invention.

FIG. 2 is a plan view of a V-type engine.

FIG. 3 is a sectional view of a V-type engine showing another embodiment of the present invention.

FIG. 4 is a sectional view of a V-type engine showing a conventional technique of the present invention.

FIG. 5 is a sectional view of a V-type engine.

[Explanation of symbols]

 2 V type engine 4 Cylinder block 6 1st cylinder head 8 2nd cylinder head 10 1st cylinder head cover 12 2nd cylinder head cover 14 1st cylinder bank 16 2nd cylinder bank 18 Bearing cap 20 Oil pan 22 Crank chamber 24 Crankshaft 84 Direct ignition coil 86 First breather chamber 88 Second breather chamber 90 Blow-by gas chamber 92 Mounting recess

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 16, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (1)

[Claims] 1. A V-type engine in which two cylinder heads and two cylinder head covers are mounted on a V-shaped cylinder block and a direct ignition coil is disposed on the cylinder head cover, respectively.
A direct ignition coil is provided only on either one of the two cylinder head covers, a first breather chamber is provided in one cylinder head cover provided with this direct ignition coil, and a second breather is provided in the other cylinder head cover. And a blow-by gas chamber are provided in the breather device for a V-type engine.