JPH055212Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a blazer device for an overhead valve engine, and in particular, the present invention is capable of preventing lubricating oil from flowing out from a blazer gas outlet formed in a rocker arm chamber. This invention relates to a blazer device for an overhead valve engine.

<Prerequisite configuration> To explain in more detail, the present invention has a crank chamber 2 of an overhead valve engine 1, as shown in FIG. 1, for example.
is communicated with the rocker arm chamber 5 on the cylinder head 4 through the push rod insertion chamber 3, a blow-by gas outlet 6 is provided in the rocker arm chamber 5, and the combustion chamber 7 passes between the cylinder peripheral wall 8 and the piston 9 to the crank chamber 2. The blow-by gas blown out is transferred to the push rod insertion chamber 3 and the rocker arm chamber 5.
This invention relates to a blazer device for an overhead valve engine having a prerequisite configuration in which the blow-by gas is discharged from the blow-by gas outlet 6 through the blow-by gas outlet 6.

<Prior art> Conventionally, as a blazer device for an overhead valve engine having the above-mentioned prerequisite configuration, a push rod insertion chamber 3 is used.
A blow-by gas inlet hole 17, which also serves as an oil return hole for returning lubricating oil flowing into the push rod insertion chamber 3 from the rocker arm chamber 5 to the crank chamber 2, is formed in the lower tapepet support wall 10. This blow-by gas inlet hole 17 is normally formed so as to vertically pass through the tapepet support wall 10 from the push rod insertion chamber 3.

<Problems to be solved by the invention> In the conventional overhead valve engine blazer device configured as described above, oil droplets splashed by the crankshaft etc. in the crank chamber 2 enter the blow-by gas inlet hole 17. A large amount of oil mist will be included in the blow-by gas. As a result, there is a problem in that a relatively large amount of oil mist is not separated from the blow-by gas and flows out from the blow-by gas outlet 6 together with the blow-by gas.

The present invention has been made in consideration of the above circumstances, and is an overhead valve engine blazer device having the above-mentioned prerequisite configuration, which is capable of preventing lubricating oil from flowing out from the blow-by gas outlet. The purpose of the present invention is to provide a blazer device.

<Means for Solving the Problems> In the overhead valve engine blazer device according to the present invention, in order to achieve the above object, a pump housing chamber is provided on the lateral outer side of the tapepet support wall 10 on the lower side of the push rod insertion chamber 3. 11, and the pump housing chamber 11
A pump installation port 13 is opened in the peripheral wall 12 of the fuel injection pump 14, and the fuel injection pump 14 is inserted into the pump housing chamber 11 through the pump installation port 13 and fixed to the peripheral wall 12 of the pump storage chamber 11. A blow-by gas buffer space 1 is provided between the fuel injection pump 14 and the tappet support wall 10 in close proximity to the tappet support wall 10.
5, a part of the push rod insertion chamber 3 is extended into the tapepet support wall 10, and a part of the tapepet support wall 10 on the side of the blow-by gas buffer space 15 of this extension part 16 is provided with a blow-by gas buffer space 15 and the extension part. This is characterized in that a blow-by gas inlet hole 17 is formed to communicate with the gas.

<Function> According to the present invention configured as described above, the lubricating oil splashes splashed by the crankshaft etc. are blocked by the tappet support wall 10 and the fuel injection pump 14 and are directly directed to the blow-by gas inlet hole 17. There's no jumping in. Further, since the flow of blowby gas is directed from the blowby gas buffer space 15 to the blowby gas inlet hole 17 in the horizontal direction, the oil mist is separated from the flow of blowby gas by its own weight within the blowby gas buffer space 15. the result,
The amount of oil mist flowing into the blow-by gas inlet hole 17 is significantly reduced. Furthermore, the blow-by gas passes through the extension portion 16, the push rod insertion chamber 3, and the rocker arm chamber 5, and then reaches the blow-by gas outlet 6.
The oil mist contained in the blow-by gas is separated from the blow-by gas by its own weight while the blow-by gas is rising, and the lubricating oil contained in the blow-by gas flowing out from the blow-by gas outlet 6 can be almost completely eliminated.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a schematic rear view of an oil-cooled engine according to one embodiment of the present invention with the essential parts cut longitudinally, FIG. 2 is a rear view of the same, FIG. 3 is a cross-sectional view taken along line - of FIG. 2, and FIG. 4 is a side view of the same.

As shown in FIG. 1, the blow-by gas that blows from the combustion chamber 7 of the overhead valve engine 1 into the crank chamber 2 through between the cylinder peripheral wall 8 and the piston 9 is formed at the upper corner of one side of the crank chamber 2. from the blowby gas buffer space 15 formed in the pipette through the blowby gas inlet hole 17 formed in the tapepet support wall 10 and the extension portion 16, and ascend into the push rod insertion chamber 3 formed on one side of the cylinder block 18 and cylinder head 4; The blow-by gas exits from a blow-by gas outlet 6 provided in the rocker arm chamber 5 on the cylinder head 4.

A crankshaft 19 and a camshaft 20 are provided within the crank chamber 2. The cam shaft 20 is disposed below the push rod insertion chamber 3, and as shown in FIG. 3, a valve drive cam 21 for an intake valve and a valve drive cam for an exhaust valve are formed at an appropriate interval in the axial direction. 22
It is equipped with An intake valve tappet 23 and an exhaust valve tappet 24, which are in sliding contact with the upper sides of these valve operating cams 21 and 22, are supported by a tappet support wall 10 below the push rod insertion chamber 3 so as to be able to slide up and down. A pump accommodating chamber 11 is formed on the lateral outer side of the tapepet support wall 10, and a pump inlet 13 is formed in the peripheral wall 12 of this pump accommodating chamber 11. The fuel injection pump 14 is inserted diagonally downward into the pump housing chamber 11 through the pump installation port 14, and is fixed to the peripheral wall 12 with its tip approaching the lower part of the tapepet support wall 10. The blow-by gas buffer space 15 is defined by a space defined within the crank chamber 2 by the fuel injection pump 14 and the tapepet support wall 10.

The push rod insertion chamber 3 has both tappets 23, 2.
4 into the tapepet support wall 10. A horizontal blowby gas inlet hole 17 is formed in a portion of the tapepet support wall 10 on the side of the blowby gas buffer space 15 of this extension portion 16 .

Incidentally, a fuel injection cam 25 for driving the fuel injection pump 14 is formed between the two valve operating cams 21 and 22 of the camshaft 20. The cylinder block 18 also includes an oil jacket 26 for cooling the cylinder, which is disposed inside the push rod insertion chamber 3. Inside the push rod insertion chamber 3, there are an intake valve push rod 27 inserted therein and an exhaust valve. A lubricating oil return path 30 separated by a partition wall 29 is formed in the middle with the valve push rod 28. The terminal end of the return path 30 is opened toward the fuel injection cam 25 above the fuel injection cam 25.

In the above configuration, the blow-by gas buffer space 15 is
The oil droplets or oil mist of the lubricating oil that are splashed away toward the blow-by gas buffer space 15 are blocked by the tapepet support wall 10, the camshaft 20, or the fuel injection pump 14, and hardly fly into the blow-by gas buffer space 15.
Further, since the flow of the blowby gas is restricted by the blowby gas inlet hole 17, the flow rate of the blowby gas within the blowby gas buffer space 15 is suppressed to a low speed. As a result, the oil mist in the blowby gas that has flowed into the blowby gas buffer space 15 is separated from the blowby gas by its own weight. Also, oil droplets in the blowby gas that entered the extension part 16 from the blowby gas inlet hole 17 are removed by the blowby gas while the blowby gas passes through the extension part 16 and the push rod insertion chamber 3 and rises to the blowby gas outlet 6 of the rocker arm chamber 5. It separates from the gas by its own weight. Then, the blow-by gas from which the oil droplets have been almost completely separated flows out from the blow-by gas outlet.

<Effects of the invention> As described above, according to the invention, oil droplets splashed toward the blowby gas inlet hole by the crankshaft etc. in the crank chamber are prevented from directly jumping into the blowby gas inlet hole by the tappet support. blocked and prevented by walls and fuel injection pumps. In addition, oil droplets in the blowby gas are separated from the blowby gas by their own weight in the blowby gas buffer space and the push rod insertion chamber, so the blowby gas that almost completely contains no lubricating oil can flow out from the blowby gas outlet. The leakage of lubricating oil from the gas outlet can be almost completely prevented.

[Brief explanation of the drawing]

FIG. 1 is a rear view of an oil-cooled engine according to an embodiment of the present invention, with main parts cut longitudinally, and FIG.
A line sectional view, and FIG. 3 is a plan view of the cylinder block. 1...Engine, 2...Crank chamber, 3...Push rod insertion chamber, 4...Cylinder head, 5
...Rotzker arm chamber, 6...Blowby gas outlet, 7...Combustion chamber, 8...Cylinder peripheral wall, 9...
Piston, 10... Tappet support wall, 11... Pump housing chamber, 12... Peripheral wall of pump housing chamber 11,
13...Pump assembly port, 14...Fuel injection pump, 15...Blow-by gas buffer space, 16...
Extension part, blow-by gas inlet hole.

Claims (1)

[Scope of Claim for Utility Model Registration] The crank chamber 2 of the overhead valve engine 1 is communicated with the rocker arm chamber 5 on the cylinder head 4 through the push rod insertion chamber 3, the rocker arm chamber 5 is provided with a blow-by gas outlet 6, and the combustion chamber 7 is connected to the rocker arm chamber 5. In a blazer device for an overhead valve engine, the blow-by gas is discharged from the engine through a cylinder peripheral wall 8 and a piston 9 into a crank chamber 2 through a push rod insertion chamber 3 and a rocker arm chamber 5 from a blow-by gas outlet 6. A pump housing chamber 11 is formed on the lateral outer side of the tapepet support wall 10 on the lower side of the push rod insertion chamber 3, a pump installation port 13 is formed in the peripheral wall 12 of the pump housing chamber 11, and a fuel injection pump 14 is inserted into the pump installation port. 13 into the pump housing chamber 11.
The tip of the fuel injection pump 14 is brought close to the tapepet support wall 10 to form a blow-by gas buffer space 15 between the fuel injection pump 14 and the tapepet support wall 10. is extended into the tapepet support wall 10, and a blowby gas inlet hole 17 is formed in a portion of the tapepet support wall 10 on the side of the blowby gas buffer space 15 of this extended portion 16 to communicate the blowby gas buffer space 15 with the extended portion. A blazer device for an overhead valve engine.