JPH0988542A - Blowby gas processing device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the increment of an oil amount returned to a combustion chamber even when the inclination of an engine exceeds a set angle. SOLUTION: A breather chamber 4 is arranged on the upper wall of the head cover 3 of a vertical type overhead valve engine E, a breathing pipe 8 is attached to the outlet 4a of the breather chamber 4, and the breathing pipe 8 is communicated with an intake port 11 through a float chamber 21. A float valve 20 is arranged in the float chamber 21 so that the float valve 20 is lifted in the float chamber 21 by buoyancy of oil when the engine E is inclined more than a set tilt angle so as to disconnect the communicating condition of the breathing pipe 8, thus a large amount of oil is prevented from being supplied to a combustion chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-by gas processing apparatus equipped with a blazer device for separating and removing an oil component of an engine blow-by gas.

[0002]

2. Description of the Related Art Conventionally, a blow-by gas processing apparatus having a blazer device for separating and removing an oil component of the blow-by gas for processing blow-by gas has been known. FIG. 6 is a vertical cross-sectional view of an engine showing an example of a conventional blow-by gas treatment device. A breather chamber 4 is provided in a head cover 3 of a vertical overhead valve engine E, and a crank chamber 12 is provided with a blow-by gas insertion hole 16 and a tappet chamber 13. And, it communicates with the breather inlet 7 of the breather chamber 4 through the push rod insertion hole 14. This type of blow-by gas treatment apparatus has a configuration in which the outlet 4a of the breather chamber 4 is opened to the atmosphere by the breather pipe 8 as shown by a virtual line 9 in FIG. 6 (open breather system) and a solid line 10 in FIG. As described above, it is roughly divided into a configuration (close breather system) that communicates with the intake port 11 of the engine E.

[0003]

However, the blow-by gas processing apparatus has the following problems. When the inclination of the engine E is within the normal range, there is no problem, but when the inclination of the engine E exceeds a predetermined angle, the engine oil flows out from the breather chamber 4 into the breather pipe 8. Therefore, in the closed breather system, Has a problem that the amount of oil returned to the fuel chamber by the breather pipe 8 increases, combustion becomes unstable, and harmful components in the exhaust gas increase. Further, even in the open breather system, when the inclination of the engine E exceeds a predetermined angle, the oil component of the engine oil that has flowed out is finally discharged to the atmosphere, which causes a problem of environmental pollution.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a large amount of engine oil flows into the blow-by gas passage when the inclination of the engine exceeds a set angle or due to the user's carelessness. It is an object of the present invention to provide a blow-by gas treatment device for an engine that can prevent an increase in the amount of oil returned to the combustion chamber even if any of these causes occur. Another object of the present invention is to prevent the engine oil from entering the atmosphere even if the engine tilt exceeds a set angle or if a large amount of engine oil flows into the blow-by gas passage due to user's carelessness. It is an object of the present invention to provide an engine blow-by gas treatment device capable of preventing an increase in the amount of oil released.

[0005]

A blow-by gas processing apparatus according to claim 1 for achieving the above object (first invention).
For example, referring to FIGS. 1 to 3, the blazer device 17 for removing and separating the oil component from the blow-by gas is communicated with the engine side port (breather port 7) formed in a predetermined portion of the engine E. , The engine side port 7 is communicated with the crank chamber 12 of the engine E, and the blow-by gas after passing through the blazer device 17 is opened to the atmosphere or returned to the intake port 11 of the engine E (breather pipe 8). In the blow-by gas treatment apparatus for an engine equipped with the above, when the amount of oil increases at a predetermined position of the blow-by gas passage 18 from the engine side port 7 to the outlet (intake port return port 19) of the blazer pipe 8 (atmosphere release port 9a). A float valve 20 for shutting off the blow-by gas passage 18 is provided. Examples of the engine-side port include an opening provided in the head cover wall, a breather inlet provided in the tappet chamber, and the like, including a case provided in the engine E.

A blow-by gas processing apparatus according to claim 2 (second
1), the blazer device 17 for removing and separating the oil component from the blow-by gas is made to communicate with the engine side port 7 formed in a predetermined portion of the engine E, and Blow-by of an engine provided with a blazer discharge passage 8 for communicating the engine side opening 7 with a crank chamber 12 of the engine E and releasing the blow-by gas after passing through the blazer device 17 to the atmosphere or returning to the intake port 11 of the engine E. In the gas treatment device, a weight valve 41 for shutting off the blow-by gas passage 18 when the amount of oil increases is provided at a predetermined position of the blow-by gas passage 18 from the engine side opening 7 to the outlets 19, 9a of the breather discharge passage 8. Characterize. The weight valve is used to mean a valve that opens and closes by the action of gravity.

[0007]

According to the blow-by gas processing apparatus of claim 1,
From the engine side port 7 to the outlets 19 and 9a of the blazer discharge passage 8
Since the float valve 21 that shuts off the blow-by gas passage 18 when the oil content increases at a predetermined position of the blow-by gas passage 18 reaching to, even if a large amount of oil flows into the blow-by gas passage due to an engine inclination or the like, It is possible to prevent the oil component from being returned to the combustion chamber or being released to the atmosphere.

According to the blow-by gas treatment apparatus of the second aspect, the engine-side port 7 is connected to the outlet 19 of the blazer discharge passage 8,
The weight valve 41 is provided at a predetermined position of the blow-by gas passage 18 up to 9a to shut off the blow-by gas passage 18 when the amount of oil increases. It can be prevented from being released.

[0009]

As described in the above operation, according to the invention of claim 1, the following unique effects are exhibited. (B) Since the float valve is provided, it is possible to prevent the oil component from returning to the combustion chamber or being released to the atmosphere when the engine is tilted. (B) Since the float valve spontaneously closes the valve due to the buoyancy of the engine oil, an independent valve drive means such as a solenoid is not required and the float valve can be constructed at low cost.

(C) If a float valve is provided at a predetermined position of the blow-by gas passage, it is possible to prevent a large amount of oil from returning to the combustion chamber or being released to the atmosphere, so that the structure of the breather device is There is an advantage that the embodiment can be appropriately modified depending on the arrangement position. (D) Even if a large amount of oil flows into the blow-by gas passage regardless of the cause not only when the engine is tilted, the oil can be reliably shut off.

According to the invention of claim 2, the following unique effects are exhibited. (E) Since the weight valve is provided, it is possible to prevent a large amount of oil from being returned to the combustion chamber or discharged to the atmosphere when the engine is tilted. (F) Since the weight valve spontaneously closes the valve due to the action of gravity, an independent valve driving means such as a solenoid is not required, and the weight valve can be constructed at low cost. (G) If a weight valve is provided at a predetermined position in the blow-by gas passage, it is possible to prevent a large amount of oil from returning to the combustion chamber or being released to the atmosphere. There is an advantage that the embodiment can be appropriately modified according to the above.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a blow-by gas processing apparatus for an engine according to the present invention will be described in detail with reference to the accompanying drawings showing an embodiment. FIG. 1 (A) is a diagram showing a first embodiment of the first invention, and is a partial vertical sectional view of an overhead valve engine, FIG. 1 (B) is an enlarged vertical sectional view of a float chamber, and FIG. 1 (C) is a diagram. 1 (B) is a cross-sectional view taken along the line CC of FIG.

In a vertical overhead valve engine E shown in FIG. 1, a cylinder head 2 is mounted on a cylinder block 1 and a head cover 3 is mounted on an upper wall of the cylinder head 2. A breather chamber 4 is provided on the upper wall of the head cover 3 so as to project. An oil separation chamber 5 is formed in the lower half of the breather chamber 4, and the oil separation chamber 5 is filled with glass wool 6. A breather inlet 7 communicating with the oil separation chamber 5 is opened in the head cover 3.

A breather pipe 8 is attached to the breather chamber outlet 4a formed in the upper half of the breather chamber 4, and the blow-by gas from which the oil component has been removed by the oil separation chamber 5 is indicated by an imaginary line 9. In the open breather system, the air is discharged to the atmosphere through the atmosphere discharge port 9a, and as shown by the solid line 10, in the closed breather system, the air is returned from the intake port return port 19 to the intake port 11. Engine E
The crank chamber 12 is communicated with the breather inlet 7 of the breather chamber 4 through the blow-by gas insertion hole 16, the tappet chamber 13, the push rod insertion port 14, and the rocker arm chamber 15.

The characteristic structure of this embodiment is that the breather pipe 8 is provided with a float chamber 21 accommodating a float valve 20. The breather inlet 7, the blazer chamber 4, the upstream blazer pipe 8 a, the float chamber 21, and the downstream blazer chamber 8
b constitutes the blow-by gas passage 18. Float room 2
1 is a cylindrical large-diameter portion 22 having a diameter larger than that of the breather pipe 8 and a downstream breather pipe 8 as shown in FIG.
b is composed of an inverted conical portion 24 communicating with the connecting pipe 23, and a bottom wall portion 26 communicating with the upstream breather pipe 8a with a connecting pipe 25. The float valve 20 is vertically movable inside the float chamber 21. ing.

The float valve 20 has a conical portion 28 formed above the cylindrical small diameter portion 27, and a peripheral surface projection 30 for forming an annular gap 29 on the peripheral surface of the cylindrical small diameter portion 27.
A disk-shaped projection 31 is formed on the bottom wall of the float valve 20 to form the annular gap 32. The float valve 20 is made of a heat-resistant material having a low specific gravity so that the engine oil in a mist state can be moved upward by buoyancy and fluid pressure.

The inclinations of the conical portion 24 of the float chamber 21 and the conical portion 28 of the float valve 20 are set to the same angle. By the circumferential surface projection 30 and the disk-shaped projection 31,
The blow-by gas in the state where the oil component is removed rises in the float chamber 21 by passing through the annular gap 29 and the annular gap 32, and flows into the downstream breather pipe 8b. The float chamber 21 is fixed to the engine E or an engine accessory so that the extending direction of the float chamber 21 is the vertical direction.

The operation of the blow-by gas processing apparatus having the float chamber having the above structure will be described. As shown in FIG. 2, when the engine E is tilted by a predetermined angle θ or more with respect to the vertical line 60, the oil component separated in the breather chamber 4 flows out into the upstream breather pipe 8 a and into the float chamber 21. In this state, the float valve 20 moves upward due to the buoyancy of the oil 33 flowing into the float chamber 21. This causes the conical portion 28 of the float valve 20 to
The connection pipe 23 is closed at the upper portion of the conical portion 28 of the float valve 20 by closely contacting with the inverted conical portion 24 of No. 1, and oil is prevented from flowing out to the downstream breather pipe 8b. Therefore,
Even when the engine is tilted, the open breather system does not pollute the atmosphere, and the closed breather system can prevent the combustion from becoming unstable due to the returned oil content. If the maximum tilt angle of the engine is less than 90 °, that is, if the engine is tilted horizontally, the float valve 20 has buoyancy, so the breather pipe 8
Can be shut off.

When the engine oil is added in excess of the specified value, if the engine is overloaded, a large amount of engine oil in the mist state will be generated.
The blow-by gas treatment device may jet the gas from the breather pipe 8 to the breather pipe 8. However, according to the blow-by gas treatment device, even if the mist-like oil 34 having a certain density or more flows into the float chamber 21, as shown in FIG. Since the communication state is cut off by moving to m, the mist-like oil 34 can be prevented from being opened to the atmosphere or being supplied to the combustion chamber.

[0020]

[Embodiment 2] FIG. 4 is a longitudinal sectional view of an essential part showing a second embodiment of the first invention. The features of the second embodiment are that the breather chamber 4 is integrated with the float chamber 21 and that the oil separating mechanism of the breather chamber 4 is formed of a meandering passage 35.

In the breather chamber 4, a tubular body 61 having a meandering passage 35 formed therein is inserted. In the cylinder 61,
The plurality of inclined plates 36 inclined downward are provided on the inner peripheral wall 37 of the cylindrical body 61.
From the left side inner peripheral wall 37a, the inclined plate 36 and the right side inner peripheral wall 37 are provided so as to project from the left side inner peripheral wall 37a.
The inclined plates 36 protruding from b are provided alternately one by one. The inclined plate 36 on one side is the inclined plate 3 on the other side.
Since the blow-by gas entering the breather chamber 4 meanders in the width direction of the breather chamber 4 as indicated by an arrow 38 in FIG. 4, the float chamber 21 provided above the blow chamber 21 Will rise towards.

In this embodiment, the blow-by gas normally enters the breather chamber 4 through the inlet of the upstream breather pipe 8a and is guided by the inclined plate 36 in a meandering manner. During the process in which the blow-by gas passes through the meandering passage 35, the oil mist contained in the blow-by gas condenses on the surface of the inclined plate 36 and is separated from the blow-by gas. The separated oil falls on the inclined bottom wall 39 of the breather chamber 4 along the surface of the inclined plate 36 by its own weight, and is returned to the inlet of the breather chamber 4. Further, when the engine oil flows out into the breather chamber 4 when the engine is tilted, the engine oil is shut off by the float valve 20 in the float chamber 21. Therefore, when the engine tilts, the engine oil flows out, and the oil component in the mist state It is possible to prevent blowing out.

In this embodiment, since the breather chamber 4 and the float chamber 21 are integrated, the attachment of the float chamber 21 can be completed by attaching the breather chamber 4, so that the assembly is simplified and one Since it can be manufactured as a unit, there is an advantage that the manufacturing cost is reduced. The breather device 17 in this embodiment can be appropriately modified from the embodiment shown in FIG. 1 in which the breather device 17 is provided on the head cover 3 and the breather device 17 is provided in communication with the crank chamber 12.

[0024]

[Embodiment 3] FIGS. 5A and 5B are longitudinal sectional views of an essential part for explaining an embodiment of a second invention of the present invention. This embodiment differs from the first embodiment of the first invention shown in FIGS. 1 to 3 only in that a weight valve 41 is used instead of the float valve 20. That is, engine E
It is characterized in that the excess flow of oil from the blow-by gas passage is prevented by the change of the direction of gravity due to the inclination of.

The weight valve 41 is constructed as follows. The breather pipe 8b on the downstream side from above the cylindrical portion 43
And the tip end port 44 of the downstream breather pipe 8b is located above the cylindrical portion 43. Bottom wall 45 of cylindrical portion 43
A connecting pipe 46 communicating with the upstream breather pipe 8a is formed in the pipe, and the blow-by gas that has entered from the upstream breather pipe 8a is normally discharged from the tip end port 44 of the downstream breather pipe 8b.

A pivot shaft 47 is provided near the center of the cylindrical portion 43 in the longitudinal direction and on the right side in the width direction, and a swing member 48 having two support arms forming a predetermined angle φ on the pivot shaft 47. Is swingably supported. An embolus member 51 that closes the tip end opening 44 of the downstream breather pipe 8b is rotatably connected to an upper support arm 49 of the swing member 48, and a weight 52 is rotated on a lower support arm 50 of the swing member 48. It is attached freely.

A tension spring 53 for pulling the embolus member 51 is disposed around the thrusted downstream breather pipe 8b, and an upper end 53a of the tension spring 53 is fixed to the upper wall of the cylindrical portion 43. The lower end portions 53b are fixed to both sides of the embolus member 51. The weight of the weight 52 overcomes the pulling force of the pulling spring 53 to position the embolus member 51 below when the engine is in a normal state where the engine is not tilted, and the embolus member 51 and the downstream breather pipe 8b.
It is set to such a value that a gap is formed between the front end port 44 and the front end port 44.

The operation of the blow-by gas processing device having the above structure will be described. When the engine inclination state is within the normal range as shown in FIG. 5 (A), as described above, due to the gravity of the weight 52, a gap is formed between the embolus member 51 and the distal end port 44 of the downstream breather pipe 8b. The formed blow-by gas is discharged from the upstream breather pipe 8a to the downstream breather pipe 8b through the inside of the cylindrical portion 43.

On the other hand, as shown in FIG. 5 (B), when the tilted state of the engine exceeds a predetermined angle θ, the gravity W is as shown in FIG.
In (B), since it is applied in the downward direction of the vertical axis 60, the gravity component W '(W' = Wcos that pulls the embolus member 51.
θ) becomes small, the tension of the tension spring 53 overcomes the gravity component W ′, and the embolus member 51 is pressed against the tip end port 44 of the downstream breather pipe 8b. Therefore, when the angle of inclination of the engine exceeds the predetermined angle θ, even if the engine oil flows into the cylindrical portion 43 of the weight valve 41, it will not be lost to the downstream breather pipe 8b. When engine oil flows into the cylindrical portion 43 of the weight valve 41, the force of pulling the embolus member 51 in the opening direction is reduced by the amount of buoyancy. Therefore, it is possible to reliably prevent the engine oil from flowing into the downstream breather pipe 8b. You can

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the present invention. Hereinafter, such an embodiment will be described. (1) In the above embodiment, the float valve 20 and the weight valve 41
Is provided on the downstream side of the breather device 17 in the flow of the blow-by gas, an embodiment may be provided on the upstream side. In this case, the amount of oil flowing out from the breather device 17 cannot be stopped, but at least a large amount of engine oil from inside the engine can be prevented from flowing into the blow-by gas passage. The breather device 1
If 7 is fixed to the engine wall, the float chamber 21 and the weight valve 41 are provided inside the engine.

(2) In the embodiment of the second invention shown in FIG. 5, the case where it is positioned between the blower pipes 8 has been described as an example. However, it is integrated with the breather device 18 as in the embodiment shown in FIG. It is also possible to adopt a configuration in which it is set. Further, the configuration of the weight valve 41 is not particularly limited as long as it substantially closes the valve by the action of gravity when the engine is tilted. (3) It is obvious that the blow-by gas treatment device for this engine can be applied regardless of whether it is a gasoline engine or a diesel engine, and can be applied regardless of the type such as the auxiliary combustion chamber type.

[Brief description of drawings]

FIG. 1 (A) is a view showing a first embodiment of the first invention, and is a partial longitudinal sectional view of an overhead valve engine, FIG. 1 (B).
Is an enlarged vertical sectional view of the float chamber, and FIG. 1 (C) is FIG. 1 (B).
6 is a cross-sectional view taken along line CC of FIG.

FIG. 2 is a vertical cross-sectional view showing a state during operation of the float valve.

FIG. 3 is a vertical cross-sectional view showing a state during operation of the float valve.

FIG. 4 is a view showing a second embodiment of the first invention, and is a vertical cross-sectional view showing a configuration in which a float chamber and a breather chamber are integrated.

5 (A) and 5 (B) are views showing an embodiment of the second invention, FIG. 5 (A) is a vertical cross-sectional view of the weight valve in a normal state, and FIG. 5 (B) is in a tilted state. 3 is a vertical sectional view of the weight valve of FIG.

FIG. 6 is a longitudinal sectional view of an engine showing an example of a conventional blow-by gas processing apparatus.

[Explanation of symbols]

4 ... Breather chamber, 7 ... Breather mouth, 8 ... Breather tube, 9a ...
Atmospheric discharge port, 11 ... Intake port, 12 ... Crank chamber, 1
7 ... Blazer device, 18 ... Blow-by gas passageway, 19 ... Intake port return port, 20 ... Float valve, 41 ... Weight valve, E ... Engine.

Claims (2)

[Claims] 1. A blazer device (4) (17) for removing and separating an oil component from blow-by gas is communicated with an engine side opening (7) formed in a predetermined portion of an engine (E), and the engine side opening (7). ) Is the crank chamber (1) of the engine (E)
The blow-by gas after passing through the blazer devices (4) and (17) is opened to the atmosphere or the engine (E).
In a blow-by gas treatment device for an engine provided with a breather discharge passage (8) for returning to the intake port (11) of the engine, the engine side port (7) is connected to an outlet (19) (9a) of the breather discharge passage (8). Blow-by gas passage to (18)
A blow-by gas treatment device for an engine, characterized in that a float valve (20) for shutting off the blow-by gas passage (18) is provided at a predetermined position of the engine. 2. A blazer device (4) (17) for removing and separating an oil component from blow-by gas is communicated with an engine side opening (7) formed in a predetermined portion of an engine (E), and the engine side opening (7). ) Is the crank chamber (1) of the engine (E)
The blow-by gas after passing through the blazer devices (4) and (17) is opened to the atmosphere or the engine (E).
In a blow-by gas treatment device for an engine provided with a breather discharge passage (8) for returning to the intake port (11) of the engine, the engine side port (7) is connected to an outlet (19) (9a) of the breather discharge passage (8). Blow-by gas passage to (18)
An engine blow-by gas treatment device, characterized in that a weight valve (41) is provided at a predetermined position to shut off the blow-by gas passage (18) when the amount of oil increases.