JP3917895B2 - Engine breather device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of an engine breather device configured in a valve arm chamber covering an upper portion of a cylinder head.
[0002]
[Prior art]
Conventionally, in an engine, a breather chamber is provided in a valve arm cover that covers the top of the cylinder head, and a separation mechanism is configured to separate blow-by gas containing oil mist into a gas component and an oil component by the breather chamber. is doing. The breather chamber is connected by an intake manifold and a breather pipe, and blow-by gas passing through the breather chamber is reduced by intake air. A pressure regulating valve is provided at the blow-by gas outlet of the breather chamber, and the pressure in the breather chamber is regulated by the pressure regulating valve.
[0003]
[Problems to be solved by the invention]
When the pressure regulating valve provided in the conventional breather chamber is a diaphragm type, the diaphragm is made of an elastic member such as a disk-shaped rubber, and the assembly direction is designated for the diaphragm to operate properly. However, the assembly direction was difficult to understand. In addition, since the diaphragm after assembly is covered with a breather lid, if the assembly of the diaphragm is forgotten, an assembly error cannot be found after assembly, and an unfinished engine may be shipped. .
[0004]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0005]
In an engine breather apparatus in which a pressure regulating valve (20) is provided at a blow-by gas outlet of a breather chamber (10), the pressure regulating valve (20) is a diaphragm type, and an identification projection ( 23a), and in the configuration in which the identification protrusion (23a) protrudes from the breather lid (25), the identification protrusion (23a) has a part of the outer periphery of the diaphragm (23) in the horizontal direction. Projecting outward, that is, radially, the identification projection (23a) protrudes outward from the edge (25a) of the breather lid (25) so that it can be confirmed from the outside, The identification protrusion (23a) makes it possible to identify whether or not the diaphragm (23) is assembled, and to identify the front and back of the diaphragm (23) and the assembly direction according to the operating characteristics .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the invention will be described.
[0007]
FIG. 1 is a front sectional view showing a valve arm chamber in which the breather apparatus of the present invention is constructed, and FIG. 2 is an enlarged sectional view of the breather chamber.
[0008]
3 is a plan view of the breather chamber, FIG. 4 is a sectional view of the pressure regulating valve, FIG. 5 is a plan view of the pressure regulating valve, and FIG. 6 is an enlarged sectional view of the pressure regulating valve.
[0009]
FIG. 7 is an enlarged sectional view of the pressure regulating valve showing the embodiment, FIG. 8 is a plan view of the breather chamber, and FIG. 9 is an enlarged sectional view of the breather chamber.
[0010]
First, the breather apparatus of the present invention will be described. As shown in FIGS. 1 to 3, a piston 40 is slidably accommodated in a cylinder of a cylinder block 45 of an engine 50, and a cylinder head 1 is fixed to the upper portion of the cylinder block 45. 1, a fuel injection nozzle 13, an intake valve 17, an exhaust valve, and the like are disposed. A valve arm case 2 is disposed above the cylinder head 1, and upper ends of the intake valve 17 and the exhaust valve are disposed in the valve arm case 2. The valve arm chamber 5 in which the upper part of the push rod 14, the valve arm 15, the upper part of the fuel injection nozzle 13, and the like are provided is configured.
[0011]
A breather chamber 10 and a pressure regulating valve 20 are provided on the upper part of the valve arm case 2, and the inside of the valve arm case 2 is vertically separated by a shielding plate 7, and the valve arm above the shielding plate 7. The inside of the case 2 is a breather chamber 10.
[0012]
In the breather chamber 10, oil trap materials 8 a and 8 b are disposed in order to remove oil mist contained in blow-by gas, and a labyrinth-like passage is formed.
[0013]
Further, the breather chamber 10 can be integrally formed on the inlet side (downward) of the pressure regulating valve 20, as shown in FIG. That is, the breather chamber 10 is formed below the inlet side of the pressure regulating valve 20, and a labyrinth passage 36 and an oil trap member are provided in the inlet portion 16 at the lower portion of the breather chamber 10 to provide a blow-by. The oil component in the gas is removed before reaching the pressure regulating valve 20.
[0014]
In the conventional pressure regulating valve, only the ring-shaped baffle 28 is provided at the inlet portion 16, and blow-by gas entering the pressure regulating valve 20 hits the baffle 28, and oil mist adheres to the baffle 28 to make the oil The component was removed. The baffle 28 also functions as a baffle plate so that blow-by gas entering the pressure regulating valve 20 does not fly directly to the diaphragm 23. However, with the configuration of the baffle 28 alone, the oil mist cannot be removed sufficiently, and a lot of oil is reduced to the intake air, resulting in a large oil consumption. In addition, a large amount of oil may be drawn into the intake air at a time, resulting in overrun and oil hammer.
[0015]
In the present invention, in addition to the baffle 28 as an oil trap member, a loam 29 is disposed in the inlet portion 16, and the oil component contained in the blow-by gas is strongly removed by the two-layer structure of the baffle 28 and the loam 29. Is. That is, it is fixed to the lower surface of the valve arm case 2 in the inlet portion 16 with a case 37 via a ring-shaped baffle 28, and the case 37 has a concave shape in a sectional view and is provided with an opening 37 a on the bottom so that it can circulate with the inlet portion 16. The loam 29 is housed in the case 37, and the loom 29 is disposed below the baffle 28. The lomo 29 is configured in a net shape with steel wool or the like. In this way, the blow-by gas reaching the pressure regulating valve 20 is configured to be covered by the baffle 28 and the loam 29 at the inlet portion 16, so that the oil component of the blow-by gas reaching the inlet portion 16 is caught by the loom 29, The oil component that has passed through the loom 29 strikes and adheres to the baffle 28 that is a baffle plate. Further, when passing through the labyrinth passage 36, the oil component hits the passage wall and adheres to be removed. Even if the oil grows in the form of droplets, it does not fall down and reach the diaphragm side. Thus, the oil component hardly reaches the diaphragm 23 of the pressure regulating valve 20.
[0016]
As described above, since the oil trap member is integrally provided on the inlet side of the pressure regulating valve 20, the arrangement is compact and the configuration is simplified, and the oil component of the blow-by gas is captured and removed before reaching the pressure regulating valve 20. In addition, the amount of oil that is reduced to intake air can be reduced. In addition, even if a large amount of oil component is generated at a time, it can be prevented from being reduced to the intake side, and overrun and oil hammer can be prevented.
[0017]
As shown in FIG. 4, the pressure regulating valve 20 has a breather lid 25 attached to the upper surface of the valve arm case 2, and a diaphragm 23 and a spring 24 are accommodated in the breather lid 25. As a body, the pressure between the breather chamber 10 and the intake manifold is adjusted. That is, a gas passage 27 connected to the outlet side of the breather chamber 10 is opened in a ring shape on the upper surface of the valve arm case 2, and an intake passage 26 is opened at the center of the gas passage 27. The other side communicates with the intake manifold via a hose 35 (FIG. 3) and the like. A pressure control diaphragm 23 serving as a valve body is mounted on the upper opening of the gas passage 27 and the intake passage 26 to close both passages 27 and 26. The diaphragm 23 is housed in a breather lid 25, and the periphery of the diaphragm 23 is pressed and fixed by an edge 25a of the breather lid 25. Further, a center plate 22 is fixed to the upper center surface of the diaphragm 23, and a spring 24 is interposed between the center plate 22 and the inner surface of the breather lid 25 to urge the diaphragm 23 to close downward. The gas passage 27 and the intake passage 26 are separated by the diaphragm 23. When the pressure in the breather chamber 10 becomes equal to or higher than the set pressure, the diaphragm 23 is pressed upward and moves to open the valve portion, so that the gas passage 27 and the intake passage 26 communicate with each other. The spring 24 determines the set pressure, and the intake passage 26 has a negative pressure, so that the diaphragm 23 is always closed.
[0018]
In the configuration of the pressure regulating valve 20, in the conventional pressure regulating valve 20, the breather lid 25 is configured to hide the diaphragm 23, so there is no means for confirming the assembly of the diaphragm from the outside, and the assembly direction of the parts is incorrect. If there is a concern about forgetting to assemble, the pressure regulating valve 20 must be disassembled to check the inside. Further, if the assembly is not easy or the assembly direction is wrong, blow-by gas or oil mist may leak from between the lower surface of the diaphragm 23 and the upper surface of the valve arm case 2. Therefore, in the present invention, a ring-shaped groove 2a is formed on the upper surface of the valve arm case 2 that fixes the outer periphery of the diaphragm 23, an O-ring 35 is fitted into the groove 2a, and the diaphragm 23 is placed. The breather lid 25 is covered from above and the four sides are fixed to the upper surface of the valve arm case 2 by screws 18, 18..., And the edge portion 25a presses around the O-ring 35 and the diaphragm 23. In this way, the gap between the lower surface of the diaphragm 23 and the upper surface of the valve arm case 2 is sealed to prevent leakage of blow-by gas and oil mist.
[0019]
Further, an identification protrusion 35a is provided on a part of the outer periphery of the O-ring 35 so as to protrude from the breather lid 25 and be confirmed from the outside. That is, as shown in FIGS. 5 and 6, the O-ring 35 is made of an elastic material such as rubber or synthetic resin, and is identified from the outer periphery of the O-ring 35 in the horizontal outward direction (radial direction). A protrusion 35a is provided so that the length of the identification protrusion 35a protrudes outside the edge 25a of the breather lid 25 so that the presence or absence of the identification protrusion 35a can be confirmed from the outside after assembly. It is configured. It is also possible to configure the fitting recess 2b so that the identification protrusion 35 is accommodated so that the identification protrusion 35a protrudes from the upper surface of the valve arm case 2 and does not get caught or obstructed.
[0020]
Further, the identification protrusion can be provided on the diaphragm 23. That is, as shown in FIG. 7, a part of the outer periphery of the diaphragm 23 protrudes from the outer periphery (radial direction) in the horizontal direction, and an identification protrusion 23a projects from the edge 25a of the breather lid 25. It is configured so that it can be exposed to the outside so that it can be confirmed from the outside. The identification protrusion 23a not only identifies whether the diaphragm 23 is assembled, but also identifies the assembly direction according to the front and back of the diaphragm 23 and the operating characteristics. Further, the identification protrusion 23a is configured by changing the shape, color, number, etc., for each type of diaphragm (or O-ring 35 is also possible), thereby confirming the type before assembling and the diaphragm 23 after assembling. The presence / absence and type of attachment can be determined at a glance. Further, by forming the diaphragm 23 and the O-ring 35 from the same member or by bonding them, the identification protrusions need only protrude from either one, reducing the number of parts and reducing the number of assembly steps. This can reduce the cost.
[0021]
As described above, the O-ring 35 is disposed between the outer periphery of the diaphragm 23 and the valve arm case 2, and the projection 23 a or 35 a is provided on the diaphragm 23 or the O-ring 35. By projecting from the breather lid 25, the sealing performance of the upper surface of the valve arm case 2 and the breather lid 25 is improved, leakage of blow-by gas to the outside can be prevented, and the diaphragm 23 or the O-ring 35 is forgotten to be assembled. It is possible to prevent mistakes and to check without requiring disassembly.
[0022]
The pressure regulating valve 20 can also be configured as follows. That is, as shown in FIGS. 8 and 9, two pressure regulating valves are arranged in parallel at the blow-by gas outlet of the breather chamber 10, and one is set to a normal set pressure, and the other is set to a normal pressure regulating valve 20 a. The pressure adjusting valve for abnormal time 20b set to the set pressure at the time of abnormal is used. It is necessary to secure the function at the time of abnormality while securing the function at the time of normal pressure control valve configuration, and it must be set to an intermediate setting to guarantee the set pressure both at normal time and at the time of abnormality. There wasn't. For this reason, when intake negative pressure fluctuation occurs due to clogging of the air cleaner or the like, the pressure in the breather chamber cannot be completely controlled, and a large amount of oil may shift to the intake side.
[0023]
As shown in FIG. 9, when the pressure regulating valves 20a and 20b having the same shape are arranged in parallel and the normal pressure regulating valve 20a does not function, the function is supplemented by the abnormal pressure regulating valve 20b. In other words, in the system for reducing the intake air of the blow-by gas, if the intake negative pressure increases due to clogging of the air cleaner, the blow-by gas that has entered the normal-time pressure regulating valve 20a from the gas inlet portion 16a becomes abnormal via the auxiliary passage 31. The pressure adjusting valve 20b is led to the intake passage 26. The spring 24b that urges the valve surface 19b of the abnormal pressure regulating valve 20b downward is a valve that communicates with the intake passage 26b by increasing the set pressure of the spring as compared with the spring 24a of the normal pressure regulating valve 20a. The surface 19b is difficult to open and is set to open in the event of an abnormality. However, instead of changing the spring constants of the springs 24a and 24b, the rigidity of the diaphragms 23 and 23 'can be changed, and the weight of the center plates 22 and 22' can be changed. The intake passage 26b communicates with an intake passage 26a provided on the normal pressure regulating valve 20a side, and the intake passage 26a communicates with an intake manifold via a hose 35.
[0024]
As described above, the pressure regulating valves having different set pressures are arranged in parallel, and the optimum set pressures are set at the normal time and the abnormal time, respectively, so that both the normal performance and the abnormal performance can be achieved. Even when intake negative pressure fluctuation occurs due to air cleaner clogging or the like, a large amount of oil transfer to the intake side can be prevented.
[0025]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0026]
In an engine breather apparatus in which a pressure regulating valve (20) is provided at a blow-by gas outlet of a breather chamber (10), the pressure regulating valve (20) is a diaphragm type, and an identification projection ( 23a), and in the configuration in which the identification protrusion (23a) protrudes from the breather lid (25), the identification protrusion (23a) has a part of the outer periphery of the diaphragm (23) in the horizontal direction. Projecting outward, that is, radially, the identification projection (23a) protrudes outward from the edge (25a) of the breather lid (25) so that it can be confirmed from the outside, by the identification projection (23a), the outer and identification of the presence or absence of assembly of the diaphragm (23), front and back or said diaphragm (23), since the assembling direction corresponding to operating characteristics and can be identified, the assembling direction of the diaphragm Easily with can be determined from, by changing the number and size of projections in accordance with the type of the diaphragm, it can easily recognize the type of diaphragm assembly, it is possible to prevent a mistake assembly.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a valve arm chamber in which a breather device of the present invention is configured.
FIG. 2 is an enlarged sectional view of a breather chamber.
FIG. 3 is a plan view of a breather chamber.
FIG. 4 is a cross-sectional view of a pressure regulating valve.
FIG. 5 is a plan view of a pressure regulating valve.
FIG. 6 is an enlarged cross-sectional view of a pressure regulating valve.
FIG. 7 is an enlarged cross-sectional view of a pressure regulating valve showing an embodiment .
FIG. 8 is a plan view of a breather chamber.
FIG. 9 is an enlarged cross-sectional view of a breather chamber.
[Explanation of symbols]
10 breather chamber 20 pressure regulating valve 23 diaphragm 25 breather lid 35a identification protrusion 35 O-ring

Claims (1)

In an engine breather apparatus in which a pressure regulating valve (20) is provided at a blow-by gas outlet of a breather chamber (10), the pressure regulating valve (20) is a diaphragm type, and an identification projection ( 23a), and in the configuration in which the identification protrusion (23a) protrudes from the breather lid (25), the identification protrusion (23a) has a part of the outer periphery of the diaphragm (23) in the horizontal direction. Projecting outward, that is, radially, the identification projection (23a) protrudes outward from the edge (25a) of the breather lid (25) so that it can be confirmed from the outside, by the identification projection (23a), the identification of the presence or absence of assembly of the diaphragm (23), front and back or said diaphragm (23), the assembling direction corresponding to the operation characteristics breather engine, characterized in that the identifiable instrumentation .

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