JPS6220658Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention uses a blazer device to separate the blow-by gas leaking from the combustion chamber of the engine into the crank chamber, and then passes it through the communication passage and intake system to the combustion chamber. This technology belongs to the technical field of engine blow-by gas combustion chamber reduction devices that reduce gas to gas, burn it here, make it harmless, and then discharge it into the atmosphere.

[Prior art]

The basic structure of the present invention is that a blazer device 7 is attached to the engine 1 to separate and remove oil mixed in the blow-by gas of the engine 1.
The inlet 18 of the blazer chamber 17 is communicated with the crank chamber 3 of the engine 1, and the outlet 23 of the blazer chamber 17 is communicated with the intake system 9 of the combustion chamber 2 via the communication passage 8. This invention relates to a blow-by gas combustion chamber reducing device configured to separate the blow-by gas leaked into the combustion chamber 3 into the combustion chamber 2 through a communication passage 8 and an intake system 9 after separating the blow-by gas into oil using a blazer device 7.

A conventional blow-by gas combustion chamber reducing device having this structure is disclosed in Japanese Utility Model Application Publication No. 113040/1983.

That is, one communication passage is led out from the oil separator installed in the engine rocker cover, and the middle part of this communication passage is connected to the intake pipe via a ventilation valve, and a communication passage is connected to the intake pipe via a check valve. It is branched into a communication path that communicates with the air cleaner, and
A communication passage led out from the crank chamber is connected to the air cleaner via a check valve.The ventilation valve acts so that the greater the negative pressure in the intake pipe, the smaller the cross-sectional area of the communication passage. The check valve attached between the air cleaner and the oil separator opens only in the direction from the oil separator to the air cleaner, and the check valve attached between the air cleaner and the crank chamber opens only in the direction from the air cleaner to the crank chamber.

[Problem that the invention attempts to solve]

However, the above structure has the following problems.

Water accumulates near the oil separator from the branch point of the communication passage led out from the oil separator, and if this accumulated water freezes in the cold winter air while the engine is stopped and blocks the communication passage, it will be difficult to start the engine. Blowby gas that later leaks from the combustion chamber into the crank chamber has no escape route, and the internal pressure in the crank chamber increases abnormally. As a result, the lubricating oil stored in the crank chamber is forced out from the mating surfaces for assembly of various parts of the engine, causing a problem in which the engine seizes up in a short period of time due to insufficient lubrication.

Further, for example, even if the communication passage 8 that communicates the blazer chamber 17 and the intake system 9 is short and has a structure that is difficult to block, it is possible to connect the combustion chamber 2 to the crank chamber 3.
When the amount of blow-by gas leaking to the engine becomes excessive, the internal pressure of the crank chamber 3 increases abnormally, causing a seizure accident, as described above.

As a solution to this problem, the inventor initially
The idea was to issue an alarm and automatically stop the engine based on the detection of abnormally high internal pressure in the crank chamber.

However, the device for this purpose is complicated and expensive, and even if there is a situation where it is desired to operate the engine as it is, there are disadvantages in that it is not possible to do so.

The present invention does not have such drawbacks,
The purpose is to solve the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention is constructed as shown in FIG. 1, for example.

That is, a blow-by gas discharge valve 24 for discharging blow-by gas in the crank chamber 3 into the atmosphere when the internal pressure of the crank chamber 3 abnormally increases is attached to the blazer device 7, an oil separation means 22 is provided in the blazer device 7, and the blazer device 7 is provided with an oil separation means 22. The inlet 34 of the blow-by gas discharge valve 24 is connected to a portion of the device 7 on the downstream side of the blow-by gas flow from the oil separation means 22 .

[Effect]

Next, its effect will be explained.

When the internal pressure of the crank chamber 3 rises abnormally, the blow-by gas in the crank chamber 3 is discharged into the atmosphere by a blow-by gas discharge valve 24 attached to the engine 1.

At this time, since the inlet of the blowby gas discharge valve is communicated with the part downstream of the blowby gas from the oil separation means in the blower device, the blowby gas after oil separation by the oil separation means is discharged into the atmosphere. be done.

Also, while the internal pressure of the crank chamber is normal pressure,
The blowby gas exhaust valve 24 is closed, and the blowby gas in the crank chamber does not flow out into the atmosphere from the blowby gas exhaust valve.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows a blow-by gas combustion chamber reduction device in a water-cooled vertical series multi-cylinder diesel engine.Blow-by gas leaking from the main combustion chamber 2 of the engine 1 to the crank chamber 3 is
While passing through the valve train cam chamber 4, tappet hole 5, and valve arm chamber 6 in order, it contains a mist of lubricating oil floating there, and most of the oil is separated and removed by the blazer device 7, and then The oil is sucked into the oil bath type air cleaner 10 at the starting end of the intake system 9 through the communication pipe 8, and the slight residual oil that could not be separated by the breather device 7 is finely separated and removed in the oil sump chamber 11 and element 12 of the air cleaner 10. Later, intake manifold 1
3. Inhaled into the combustion chamber 2 through the intake port 14,
There, it is burned and rendered harmless before being emitted into the atmosphere.

The blazer device 7 is a head cover 15 of the engine 1.
2 and 3, and is configured as shown in FIGS. 2 and 3.

That is, the blazer case 16 is formed to bulge upward from the right half of the upper wall of the head cover 15.
An inlet 18 is open at the lower end of the blazer chamber 17 in the blazer case 16 and communicates with the valve arm chamber 16 via an oil-proof plate 19. The blazer chamber inlet 18 communicates with the crank chamber 3 via the valve arm chamber 6, the tappet hole 5, and the valve train cam chamber 4.

A steel wool layer 20 is provided in the lower half of the blazer chamber 17, and a gate-shaped oil-proof plate 21 having a communication hole 40 is provided in the upper half. This steel wool layer 20 and the gate-shaped oil-proof plate 21 constitute an oil separation means 22. The outlet hole 23 of the blazer chamber 17 opens in the blazer case 16 on the right outer side of the gate-shaped oil-proof plate 21 and communicates with the inside of the crank chamber 3 through a communication hole 40.
It communicates with an air cleaner 10 at the starting end of the intake system 9 via a communication pipe 8 . If the engine 1 is started with the communication pipe 8 blocked by ice, or if an excessive amount of blow-by gas leaks from the combustion chamber 2 to the crank chamber 3 during engine operation, blow-by gas may leak into the crank chamber 3. As it accumulates, its internal pressure begins to rise abnormally. At this time, crank chamber 3
A blowby gas discharge valve 24 for discharging blowby gas from the blazer case 16 into the atmosphere is provided within the thick wall portion 31 of the right side wall of the blazer case 16, located above the blazer chamber outlet hole 23.

That is, a valve chamber 32 is formed within the thick walled portion 31, and an inlet 34 is formed on the tapered lower surface 33 of the valve chamber 32.
However, an outlet 35 is provided on the upper circumferential surface. The valve chamber inlet 34 communicates with the blazer chamber outlet hole 23,
Valve chamber outlet 35 communicates with the atmosphere. The ball valve body 36 is inserted into the valve chamber 32, and the blazer chamber inlet 3 is closed by its own weight.
Close 4.

As a result, the blow-by gas that is about to accumulate in the crank chamber 3 is removed from the blow-by gas discharge valve 24.
The lubricating oil 2 stored in the crank chamber 3 is prevented from increasing in pressure abnormally because the ball valve body of the crank chamber 3 is opened and the lubricating oil 2 is released from there into the atmosphere.
6 is between the mating surfaces 27, 2 for assembly of each part of the engine 1
8, 29... to be pushed out to the outside.

Furthermore, during normal operation in which neither blockage of the communication pipe 8 nor excessive leakage of blowby gas occurs, the blowby gas discharge valve 24 is closed by the weight of the ball valve body, so that no blowby gas flows out from there.

As another embodiment of the present invention, a part of the above embodiment may be modified as follows.

A. The blazer device 7 is relocated to the upper part of the crankcase 3, or to the upper part of the gear case or fuel injection pump chamber 30 communicating with the crankcase 3.

B. A flow rate detector or a horn is connected to the outlet of the blow-by gas discharge valve 24, so that the presence or absence of an abnormal increase in the internal pressure of the crank chamber 3 can be detected by the flow rate detector or the horn.

C. If it is desired to particularly finely separate and remove the oil mixed in the blow-by gas, a cyclone type or other type of oil separator is interposed in the middle of the communication pipe 8.

D. Reconnect the terminal end of the communication pipe 8 to the intake manifold 13 or intake port 14.

E Connect the terminal end of the communication pipe 8 to the air cleaner 10 in any one of the states a to e shown in FIG. 4.

E As shown in FIG. 5, the blow-by gas discharge valve 24 is relocated to the lower side of the blazer chamber outlet hole 23,
The ball valve body 36 is pushed up by a spring 37 to close the valve.

G As shown in FIG. 6, the blow-by gas exhaust valve 24 is a normally closed type valve that opens and closes a valve inlet 34 led upward from the middle of the blazer chamber outlet hole 23 and an atmosphere communication end at the upper end of the valve inlet 34. It is made up of a reed valve body 38 and a valve holder 39 that limits the opening amount of the reed valve body 38.

〔effect〕

Since the present invention is configured and operates as described above, it has the following effects.

B. When the internal pressure of the crank chamber begins to rise abnormally due to blockage of the communication passage or excessive leakage of blow-by gas from the combustion chamber to the crank chamber, the blow-by gas in the crank chamber is discharged. Since it is released into the atmosphere through the valve, it is possible to reliably prevent the internal pressure in the crank chamber from increasing abnormally.

This prevents the lubricating oil stored in the crank chamber from being forced out due to an abnormal increase in crank chamber pressure, which could cause the engine to seize up in a short period of time due to insufficient lubrication. can.

Moreover, for this purpose, it is only necessary to add a blow-by gas discharge valve, and this blow-by gas valve can be a small one with a simple structure that only discharges the blow-by gas at high pressure, so it can be easily implemented at low cost.

Moreover, if there are circumstances where you would like to continue operating the engine, you can do so freely.

While the internal pressure of the crankcase is at normal pressure, the blow-by gas exhaust valve is closed and the blow-by gas in the crankcase does not flow out into the atmosphere.
This can eliminate the contamination of the surroundings and air pollution caused by the blow-by gas.

(d) Even if the internal pressure in the crank chamber begins to rise abnormally and the blow-by gas is discharged into the atmosphere, the blow-by gas discharged into the atmosphere from the blow-by gas discharge valve will have oil content removed from it beforehand when it passes through the oil separation means of the blazer device. Since it is separated and removed, there is almost no pollution of the surrounding area or air pollution.

Moreover, since the oil separation means of the breather device separates and removes the oil, the blow-by gas discharge valve can be made simple in structure and does not require an oil separation means.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of the entire engine, FIG. 2 is an enlarged view of the part in FIG. 1 and 5 and 6 are views corresponding to FIG. 2 and showing other embodiments of the blow-by gas discharge valve, respectively. 1... Engine, 2... Combustion chamber, 3... Crank chamber, 7... Blazer device, 8... Communication passage, 9...
Intake system, 17... Blazer chamber, 18... Blazer chamber inlet, 22... Oil separation means, 23... Blazer chamber outlet, 24... Blowby gas discharge valve, 34... 2
4 entrance.

Claims (1)

[Scope of utility model registration request] A blazer device 7 for separating and removing oil mixed in the blow-by gas of the engine 1 is attached to the engine 1, and the inlet 18 of the blazer chamber 17 of the blazer device 7 is communicated with the crank chamber 3 of the engine 1.
The outlet 23 of the combustion chamber 2 is communicated with the intake system 9 of the combustion chamber 2 via the communication passage 8, whereby the blow-by gas leaked from the combustion chamber 2 to the crank chamber 3 is transferred to the blazer device 7.
In an engine blow-by gas combustion chamber reduction device configured to separate oil in the combustion chamber 2 and then return it to the combustion chamber 2 via the communication passage 8 and the intake system 9, when the internal pressure of the crank chamber 3 rises abnormally, A blow-by gas discharge valve 24 for discharging blow-by gas into the atmosphere is attached to the blaster device 7, and an oil separation means 22 is provided in the blaster device 7, and a blow-by gas discharge valve 24 is provided in the blow-by gas flow downstream of the oil separation means 22 in the blaster device 7. Inlet 3 of blow-by gas discharge valve 24 in part
A blow-by gas combustion chamber reduction device for an engine, characterized in that 4 is connected to the combustion chamber.