JPH066176Y2 - Blow-by gas combustion chamber reduction device for diesel engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a blow-by gas combustion chamber reduction device for reducing blow-by gas leaking from a combustion chamber to a crank chamber to the combustion chamber through an intake passage.

<Prior art> When the blow-by gas leaked from the combustion chamber of the engine to the crank chamber is returned to the combustion chamber through the intake passage, since the oil mist is mixed in the blow-by gas,
Conventionally, there is a valve arm chamber that communicates with the crank chamber and is provided with an oil separating unit composed of a buffer chamber and a check valve, and a gas outlet passage led from the oil separating unit is connected to an intake system. .

<Problems to be Solved> However, in the conventional one in which the buffer chamber and the check valve constitute the oil separating means, a space for disposing the oil separating means in the valve arm chamber is required, and There was a problem that the arm room and eventually the entire engine became large. In addition, since the blow-by gas that has been drawn out of the crank chamber is returned to the intake system, if the air cleaner, etc., becomes clogged, the intake negative pressure in the intake system will increase and the amount of blow-by gas that is sucked out will increase. Because blow-by gas is sucked into the intake system without sufficient oil separation by the separation means,
The oil in the blow-by gas burns in the combustion chamber, polluting the atmosphere and causing the engine to overrun.

<< Means for Solving Problems >> The present invention eliminates the need for a special blazer device and has a simple structure to maintain a negative pressure in the crank chamber, while at the same time, it is possible to reliably prevent oil leakage from blow-by gas. (EN) A combustion chamber reduction device, for which the blow-by gas leaking from the combustion chamber of a diesel engine to the crank chamber is reduced to the combustion chamber from the crank chamber through the oil separation means, the gas derivation path and the intake path in order. In the blow-by gas combustion chamber reduction device for a diesel engine configured as described above, a mechanical auto timer is arranged on the rotating shaft of the diesel engine, and this mechanical auto timer is configured such that a driven flange is interlockingly connected to a main drive gear via an advance mechanism,
A driving gear is rotatably supported at the tip of the driven flange boss cylinder, and a communication hole is provided in the middle of the driven flange boss cylinder so that the inlet of the gas outlet path is the boss of the mechanical auto timer driven flange. The mechanical auto timer also serves as an oil separating means by opening the gas outlet passage to face the inside of the cylinder and communicating the inlet of the gas outlet path with the crank chamber through the boss cylinder, the communication hole, and the outer space of the advance mechanism. It is characterized by that.

<Operation> In the present invention, the driven flange is interlockingly connected to the driving gear through the advance mechanism, the driving gear is rotatably supported at the tip of the boss cylinder of the driven flange, and the midway of the boss cylinder of the driven flange. The mechanical auto timer of the engine is constructed by opening a communication hole in the section, and the inlet of the gas outlet passage communicating with the intake passage is opened so as to face the inside of the boss cylinder of the mechanical automatic timer driven flange. By communicating the inlet with the crank chamber through the inside of the boss cylinder, the communication hole, and the outer space of the advance mechanism, the mechanical auto timer also serves as an oil separating means, so blow-by gas from the crank chamber does not flow through the mechanical auto timer. Oil is separated as it passes through. Then, the separated oil lubricates the movable part of the mechanical automatic timer.

<Embodiment> The drawings show an embodiment of the present invention. Fig. 1 is an enlarged cross-sectional view of a main part, Fig. 2 is a schematic perspective view of an overhead valve type vertical diesel engine, and Fig. 3 is a partially longitudinal side view. is there.

In this diesel engine (E), the cylinder block part and the crankcase part are integrally formed, and the piston (3) is arranged in the cylinder (2) formed in the cylinder block part so that the piston (3) can be moved up and down. With combustion chamber (4) and crank chamber
(5) and is partitioned. A gear case (6) is attached to the front of the crank case and cylinder block.
The gear chamber (7) in the gear case (6) and the crank chamber (5) communicate with each other at the lower part.

A cylindrical timer case (8) is projected forward from the upper part of the gear case (6), and a gas outlet passage (10) is led out from the front wall of the timer case (8) to the intake passage (9). is there.

Inside the timer case (8), there is a mechanical auto timer (11) that adjusts the fuel injection timing according to the number of revolutions of the diesel engine (E) .The mechanical auto timer (11) is a gear chamber. It has a driving gear (13) meshing with the drive gear (12) in (7), a driven flange (14) and an advance mechanism (15), and the driving gear (13) is driven from the driven flange (14). The boss cylinder (16) protruding rearward is rotatably fitted on and supported by the tip of the boss cylinder (16). The boss cylinder (16) penetrates the front wall of the cylinder block and projects into the gear chamber (7). The fuel injection cam shaft (17)
It is fitted and fixed on.

In the middle of the boss cylinder (16), the position of the advance mechanism (15) and the boss cylinder
A communication hole (18) that communicates with the inside of (16) is provided through, and the inside of the boss cylinder (16) is exposed to the entrance of the gas outlet passage (10).
(19) is open.

Therefore, the blow-by gas leaked from the combustion chamber (4) to the crank chamber (5) is sucked from the gear chamber (7) through the gas outlet passage (10) to the intake passage (9). Since the lubricating oil is in the form of mist and drifts in (7), this oil mist mixes with the blow-by gas and flows in the gear chamber (7) toward the gas discharge passage (10). . At this time, the inlet (19) of the gas outlet (10) is connected to the mechanical auto timer (1
Since it is opened so as to face the inside of the boss cylinder (16) of 1), the inside of the boss cylinder (16) receiving negative suction pressure and the boss cylinder
A pressure difference is generated between the outer circumference of (16) and the blow-by gas passes through the communication hole (18) formed in the boss cylinder (16).
As a result, the blow-by gas and the oil mist mixed in the blow-by gas flow through the mechanical auto timer (11), the oil mist and the mechanical auto timer (11) come into contact, and the oil is mechanical Since it adheres to (11), oil is removed from the blow-by gas. That is, in this example, the mechanical auto timer (11) also serves as the oil separating means (S).

<Effect> In the present invention, the driven flange is interlockingly connected to the driving gear through the advance mechanism, the driving gear is rotatably supported at the tip of the boss cylinder of the driven flange, and the midway of the boss cylinder of the driven flange. The mechanical auto timer of the engine is configured by opening a communication hole in the section, and the inlet of the gas outlet passage communicating with the intake passage is opened by facing the inside of the boss cylinder of the driven flange of the mechanical automatic timer. The entrance of the inside of the boss
By communicating with the crank chamber through the communication hole and the outer peripheral space of the advance mechanism, the mechanical auto timer also serves as the oil separating means, so the blow-by gas from the crank chamber is not oiled when passing through the mechanical auto timer. As a result of the separation, the dedicated blazer device can be omitted.

As a result, the structure of the engine can be simplified.

Also, since the mechanical auto timer also serves as an oil separating means, the mechanical auto timer separates the oil from the blow-by gas, and this separated oil improves the weight pin section of the mechanical auto timer, which tends to cause insufficient lubrication. Can be lubricated.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is an enlarged cross-sectional view of a main part, FIG. 2 is a schematic perspective view of an overhead valve type vertical diesel engine, and FIG. 3 is a partially longitudinal side view. 4 ... Combustion chamber, 5 ... Crank chamber, 9 ... Intake passage, 10 ... Gas discharge passage, 11 ... Mechanical auto timer, 13 ... Main drive gear, 14
… Flange driven, 15… Advance mechanism, 16… Boss cylinder, 17… (E)
Rotating shaft, 18 ... communication hole, 19 ... (10) inlet, E ... diesel engine, S ... oil separating means.

Claims (1)

[Scope of utility model registration request] 1. A blow-by gas leaked from a combustion chamber (4) of a diesel engine (E) to a crank chamber (5) is crank chamber (5).
To oil separation means (S), gas discharge path (10) and intake path (9)
In a blow-by gas combustion chamber reduction device for a diesel engine that is configured to return to the combustion chamber (4) in sequence, a mechanical auto timer (11) is arranged on the rotary shaft (17) of the diesel engine (E). Auto timer (1
1) is the driven flange via the advance mechanism (15) to the drive gear (13).
(14) are interlockingly connected, and the boss cylinder (1
The driving gear (13) is rotatably supported at the tip of (6), and the communication hole (1) is provided in the middle of the boss cylinder (16) of the driven flange (14).
8) is provided so that the inlet (19) of the gas outlet (10) faces the inside of the boss cylinder (16) of the driven flange (14) of the mechanical auto timer (11), and the gas outlet (10) is opened. ) Entrance (19) to boss tube (16)
The mechanical automatic timer (11) also serves as the oil separating means (S) by communicating with the crank chamber (5) through the inner space, the communication hole (18), and the outer peripheral space of the advance mechanism (15). Blow-by gas combustion chamber reduction device for diesel engines