JPS647209Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a breather device for a V-type engine.

(Prior art) As a conventional device of this kind, for example, Japanese Patent Application Laid-Open No. 59-188019
As described in the above publication, it is known that a V-type engine is provided with a breather chamber, and blow-by gas from the crank chamber of the engine is returned to the intake system through the breather chamber. Generally, the breather chamber is formed separately from the bank bottom wall, and the blow-by gas flows unidirectionally from below to above.

(The problem that the invention aims to solve) However, the breather chamber, which is separate from the bank bottom wall, is complicated to install, and the one-sided flow of blow-by gas has low gas-liquid separation ability, increasing oil consumption. There were some problems, such as:

The present invention aims to solve such problems.

(Means for Solving the Problems) The configuration of the present invention for achieving the above object will be explained based on an embodiment. The present invention provides a V-type engine 1 with a breather chamber 10, and a crank chamber 6 of the engine. The blow-by gas from the breather chamber 1
0, the V-type engine 1 is formed into a cylinder bore offset type in which the center line of the cylinder bore arranged on one side is offset from the center line of the cylinder bore arranged on the other side. , the breather chamber 10 is recessed in the V-bank bottom wall 11, and the left and right inner wall surfaces 12a, 12a are bent in a meandering manner by a recess and a projection between the cylinder bores, and the inner wall surface 12
The breather chamber 10 is divided by a rib 13 with a small hole 13a provided between a and 12a, and is formed into an integral type with a bank bottom wall covered with a lid body 14.
communicates with the crank chamber 6 through holes 12b, 12b at both ends in the crankshaft direction, and communicates with the valve operating chamber 3a above each cylinder head 3 through a communication passage 15 formed in the wall of the recess between the cylinder bores. It is characterized by having

(Example) The invention will now be described with reference to illustrated embodiments.

In the drawings, reference numeral 1 indicates a V-type engine consisting of a V-shaped cylinder block 2 and a pair of cylinder heads 3, 3 mounted on the upper side of the block 2. The pistons 4 in the plurality of cylinders of the cylinder lock 2 are connected to the crankshaft 7 in the crank chamber 6 via each connecting rod 5. and a plurality of intake and exhaust valves 8 are provided in each cylinder head 3,
Furthermore, a camshaft 9 for opening and closing these valves 8 is provided in the valve train chamber 3a above each cylinder head 3,
The overall configuration was an OHC type V-type engine.

Then, a breather chamber 10 is provided in the engine 1,
Blow-by gas from the crank chamber 6 of the engine 1 is recirculated to the intake system.

Although the above is not particularly different from the conventional one, according to the present invention, a recess 12 is formed in the V-bank bottom wall 11 of the engine 1 and the recess 12 is covered, thereby configuring the inside of the recess 12 as a breather chamber 10. Breather room 10
The left and right inner wall surfaces 12a, 12a are bent into an uneven shape by a concave portion and a convex portion between the cylinder bores, and a rib 13 is erected across the inner wall surfaces 12a, 12a, which will be described in detail for the illustrated one. The recess 12 is formed downwardly on the upper surface of the bottom wall 11 over substantially the entire length in the direction of the crankshaft 7, and a lid 14 is provided on the upper surface of the recess 12.
2, a pair of ribs 13 are provided with a gap in the direction of the crankshaft 7, a through hole 13a is formed in each of the ribs 13, 13, and the recess 12 is formed at both ends in the direction of the crankshaft 7. The recess 12 is communicated with the inside of the crank chamber 6 through the holes 12b, 12b, and the recess 12 is communicated with the two operating valve chambers 3a, 3a via a communication passage 15 formed in the cylinder wall of the cylinder block 2. One of both valve chambers 3a, 3a
Through the PCV valve 16, the intake system, for example, the intake manifold 17, and the other end are communicated with the upstream side of the throttle valve 18, and thus the crank chamber 6
Blow-by gas from the air is returned to the intake system through the recess 12, that is, the breather chamber 10. In the drawing, reference numeral 19 indicates an oil pan provided below the cylinder block 2, and reference numeral 20 indicates an oil drop passage for returning oil in both valve chambers 3a, 3a to the oil pan 19.

(Operation) The operation of the present invention will be explained based on the above-mentioned embodiment.Blow-by gas from the crank chamber 6 of the engine 1 is guided into the breather chamber 10, where the oil component is separated and only the blow-by gas is taken into the air. It is refluxed into the system, and in this respect it is the same as the conventional one, but the conventional one has the above-mentioned disadvantages because the breather chamber is formed separately from the engine, whereas the one of the present invention has the above-mentioned disadvantages. A recess 12 formed in the V-bank bottom wall 11 of the engine 1 allows the breather chamber
0, the number of parts can be reduced and the weight can be reduced.

In addition, a load is applied to the bottom wall 11 in a direction orthogonal to the crankshaft 7, and in this case, simply forming the recess 12 in the bottom wall 11 would not provide sufficient rigidity. According to the invention, the recess 1
The ribs 13 extending over the front and rear inner wall surfaces 12a, 12a in the direction orthogonal to the crankshaft 7, which are provided upright on the bottom wall 11, increase the rigidity of the bottom wall 11 against the above-mentioned load, and there is no problem in terms of strength.

Of course, it is also possible to configure the interior of the recess 12 as the breather chamber 10 by forming the recess 12 on the lower surface of the bottom wall 11, that is, on the side of the crank chamber 6, and closing the recess 12 from below.

(Effect of the invention) As described above, according to the invention, the V-type engine is formed into a cylinder bore offset type in which the center line of the cylinder bore arranged on one side is offset from the center line of the cylinder bore arranged on the other side. , the breather chamber 10 is recessed in the V-bank bottom wall 11, and the left and right inner wall surfaces 12
a, 12a are bent in a meandering manner by a concave portion and a convex portion between the cylinder bores, and are divided by a rib 13 with a small hole 13a provided across the inner wall surfaces 12a, 12a, and are covered with a lid body 14. Since the bottom wall is integrally formed, the blow-by gas is bent at the inner wall surface 12a and is obstructed by the ribs 13, thereby increasing its gas-liquid separation ability. hole 1
2b, 12b to the crank chamber 6, and also to the valve chamber 3a above each cylinder head 3 via the communication passage 15 formed in the wall of the recess between the cylinder bores, so that the blow-by gas flows through the breather chamber 10. The air flows from the lateral direction to the vertical direction of the communication passage 15, further increasing the gas-liquid separation ability, and the breather chamber and the communication passage are formed in a cylinder block, which has the advantage that they can be arranged compactly.

[Brief explanation of the drawing]

FIG. 1 is a cut-away front view of an engine equipped with an example of the device of the present invention, FIG. 2 is a plan view of a cylinder block, and FIG. 3 is a side view cut along the line -2. 1...Engine, 6...Crank chamber, 10...
Breather chamber, 11... Bottom wall portion, 12... Recessed portion, 1
3...rib, 14...lid body.

Claims (1)

[Scope of utility model registration request] A V-type engine is provided with a breather chamber, and blow-by gas from the crank chamber of the engine is recirculated to the intake system through the breather chamber, in which the center line of the cylinder bore with the V-type engine arranged on one side and the other side The cylinder bores are arranged in a cylinder bore offset type in which the center line of the cylinder bores is offset, and the breather chamber is recessed in the bottom wall of the V bank so that the left and right inner wall surfaces meander by the recesses and projections between the cylinder bores. The bottom wall of the bank is bent into a shape, divided by a rib with a small hole provided between the inner wall surfaces, and covered with a lid body.The breather chamber is formed at both ends in the crankshaft direction. A breather device for a V-type engine, characterized in that the breather device communicates with a crank chamber through a hole in the cylinder head, and communicates with a valve chamber above each cylinder head through a communication path formed in a wall of a recess between the cylinder bores.