JP2005023852A - Pressure adjustment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent excessive enlargement of a pressure adjustment device in increasing the maximum quantity of a flow rate capable of flowing out from an outflow port. <P>SOLUTION: A fluid chamber 14 and an atmospheric air chamber 16 are closed from each other by dividing an adjustment chamber 10 into the fluid chamber 14 with which an inflow port 3 and the outflow port 6 communicate and the atmospheric air chamber 16 with which an atmospheric air entrance 15 communicates by a valve element 11 having a regulating valve 12 and the valve holding body 13 holding the regulating valve 12. The valve holding body 13 is formed cylindrical and made free to extend and contract in its axial direction. Consequently, a diameter D2 of the valve holding body 13 never becomes large even when overall length of the valve holding body 13 is set long. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure adjusting device such as a PCV (Positive Crankcase Ventilation) valve device.
[0002]
[Prior art]
Conventionally, in an internal combustion engine such as a diesel engine, the internal pressure of the crankcase is increased by blow-by gas. Therefore, the internal combustion engine is provided with a PCV valve device that is a pressure adjusting device for adjusting the internal pressure of the crankcase. Such a conventional PCV valve device is shown in FIG.
[0003]
As shown in FIG. 5, the conventional PCV valve device 101 is provided with an adjustment chamber 103 in a main body casing 102. The adjusting chamber 103 communicates with a crankcase (not shown) and communicates with an inlet 104 through which blow-by gas flows and an outlet 105 through which blow-by gas flows out. The outlet 105 communicates with an intake system (not shown) of the internal combustion engine and the atmosphere.
[0004]
A valve body 106 is provided in the adjustment chamber 103. The valve body 106 is configured such that an adjustment valve 107 that opens and closes the outlet 105 is attached to a distal end portion of a diaphragm 108 that is a conical valve holder. The other end of the adjustment valve 107 is fixed to the inner surface of the main casing 102, and the adjustment chamber 103 communicates with the fluid chamber 109 into which blow-by gas flows by the valve body 106 and the atmosphere inlet / outlet 110 through which the atmosphere enters and exits. It is partitioned into an atmospheric chamber 111 that is maintained at atmospheric pressure. The diaphragm 108 deforms and moves the regulating valve 107 close to and away from the outlet 105.
[0005]
The valve body 106 is urged by a coil spring 112 in a direction in which the regulating valve 107 closes the outlet 105. When the internal combustion engine is not operating, the adjustment valve 107 is positioned at a position where the outlet 105 is closed by the biasing force of the coil spring 112.
[0006]
In the PCV valve device 101 having such a structure, the pressure in the fluid chamber 109 is increased by the blow-by gas flowing into the fluid chamber 109 from the crankcase, and the pressure is determined by the atmospheric pressure in the atmospheric chamber 111 and the urging force by the coil spring 112. When the resultant force is larger than the resultant force, the diaphragm 108 of the valve body 106 is crushed and deformed in a direction in which the size of the atmospheric chamber 111 is reduced. As a result, the regulating valve 107 moves in the direction of opening the outlet 105, the blow-by gas in the fluid chamber 109 flows out from the outlet 105, and the internal pressure of the crankcase is adjusted.
[0007]
[Problems to be solved by the invention]
In order for such a PCV valve device 101 to cope with a large flow rate of blow-by gas from a large internal combustion engine, it is necessary to cause a large flow rate of blow-by gas to flow out from the outlet 105. In order to allow a large flow rate of blow-by gas to flow out from the outlet 105, the size of the flow path 113 formed between the regulating valve 107 and the outlet 105 that is located farthest from the outlet 105 is increased. A method of setting and increasing the maximum amount of flow that can flow out from the outlet 105 is adopted. Specifically, the width of the adjustment valve 107 in the movement direction of the adjustment chamber 103 is increased, and the maximum separation position of the adjustment valve 107 with respect to the outlet 105 is further away from the outlet 105.
[0008]
As described above, when the maximum separation position of the regulating valve 107 with respect to the outlet 105 is further away from the outlet 105, the distance from the closing position of the regulating valve 107 to the maximum separation position of the regulating valve 107 with respect to the outlet 105 is long. Accordingly, in response to this, the skirt of the conical diaphragm 108 is extended, and the moving distance of the tip of the diaphragm 108 is increased. However, if the skirt of the diaphragm 108 is extended in this way, the diameter D1 of the skirt of the diaphragm 108 is increased accordingly, so that the portion not directly related to increasing the flow rate of blowby gas is excessively large. As a result, there is a problem that the PCV valve device 101 becomes excessively large.
[0009]
An object of the present invention is to prevent the pressure regulator from becoming excessively large when increasing the maximum amount of flow that can flow out from the outlet.
[0010]
[Means for Solving the Problems]
The invention of the pressure regulating device according to claim 1 is characterized in that an inflow port through which a fluid flows in, an outflow port through which the fluid flows out, and an atmospheric air inlet / outlet through which the atmosphere enters and exits, a cylindrical chamber formed in the axial direction A valve holder that is extendable and retractable, and an adjustment valve that is provided at an end of the valve holder and that changes the size of the flow path between the outlet and the outlet by approaching and moving away from the outlet. A valve body that divides the adjustment chamber into a fluid chamber in which the inlet and the outlet communicate with each other and an atmospheric chamber in which the atmosphere inlet and outlet communicate with each other and seals between the fluid chamber and the atmosphere chamber; Urging means for urging the valve body in a direction in which the valve holder extends so that the valve holder can be contracted by the pressure of fluid.
[0011]
Therefore, when the cylindrical valve holder expands and contracts in the axial direction, the adjustment valve moves closer to and away from the outlet. Since this valve holder is cylindrical, it is possible to set the entire length of the valve holder long without increasing the diameter of the valve holder, and thereby without increasing the diameter of the valve holder. The travel distance of the regulating valve held at the end of the valve holder can be set longer, and when trying to increase the maximum flow rate that can flow out from the outlet, it is directly necessary to increase the flow rate. It is possible to prevent the pressure regulating device from becoming excessively large without excessively increasing the parts that are not related.
[0012]
According to a second aspect of the present invention, in the pressure adjusting device according to the first aspect, the valve holder is formed in a bellows shape so as to expand and contract in the axial direction.
[0013]
Therefore, the valve holder is realized with a simple shape.
[0014]
According to a third aspect of the present invention, in the pressure regulating device according to the first or second aspect, the valve holder and the regulating valve are integrally formed.
[0015]
Therefore, the number of parts of the valve body including the valve holder and the adjustment valve is reduced. Further, there is no need to provide a coupling member for coupling the valve holder and the regulating valve.
[0016]
According to a fourth aspect of the present invention, in the pressure regulating device according to the first, second, or third aspect, a coil spring that pushes the outlet side of the regulating valve in a direction in which the valve holder contracts is provided.
[0017]
Therefore, the fluctuation of the valve body due to the influence of the fluid flow or the like is prevented. Further, the initial position of the adjusting valve can be set to an arbitrary position by setting the coil spring.
[0018]
According to a fifth aspect of the present invention, in the pressure adjusting device according to the fourth aspect, the coil spring is formed so as to have a larger diameter than the outflow port so as to surround the outflow port, and the coil spring has no gap. Even in a contracted state, a valve section flow path that connects the outside and the inside of the coil spring is provided.
[0019]
Accordingly, since the fluid flows in the valve portion flow path from the outside to the inside of the coil spring, the flow rate of the fluid flowing to the outlet is reduced even if the amount of the fluid passing through the gap of the coil spring decreases due to contraction of the coil spring. It is possible to secure a predetermined amount.
[0020]
According to a sixth aspect of the present invention, in the pressure regulating device according to the fifth aspect, the support portion of the coil spring of the regulating valve is formed in a concavo-convex shape, and the valve portion flow path includes the concave and convex portion in the concavo-convex shape and the It is formed between the coil springs that come into contact with the concavo-convex convex portions.
[0021]
Therefore, it is possible to realize the valve portion flow path with a simple structure.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. The present embodiment is an example in which a PCV valve device is applied as a pressure adjusting device. Here, FIG. 1 is a vertical side view showing the PCV valve device of the present embodiment together with the internal combustion engine, FIG. 2 is a vertical side view showing the PCV valve device in a state in which the control valve is closed, and FIG. It is a vertical side view which shows the PCV valve apparatus of a state.
[0023]
As shown in FIG. 1, the PCV valve device 1 has an inlet 3 formed in the main body casing 2 connected to a crankcase 5 of an internal combustion engine 4 such as a diesel engine, and an outlet formed in the main body casing 2. 6 is communicated with an intake manifold 7 of the internal combustion engine 4. The intake manifold 7 is communicated with an air cleaner 8. The PCV valve device 1 generally adjusts the internal pressure of the crankcase 5, and blow-by gas, which is a fluid leaked from the combustion chamber 9 of the internal combustion engine 4 to the crankcase 5, via the intake manifold 7. Thus, the gas is recirculated into the combustion chamber 9.
[0024]
Such a PCV valve device 1 will be described in detail with reference to FIGS. As shown in FIGS. 2 and 3, an adjustment chamber 10 communicating with the inflow port 3 and the outflow port 6 described above is provided in the main body casing 2 of the PCV valve device 1.
[0025]
A valve body 11 is provided in the adjustment chamber 10. The valve body 11 is configured such that a disc-shaped adjusting valve 12 that opens and closes the outlet 6 closes one end of a cylindrical expandable body 13 that is a valve holder. The adjusting valve 12 and the expansion / contraction body 13 are formed by integral molding of rubber. The other end of the elastic body 13 is fixed to the inner surface of the main casing 2. The adjustment chamber 10 is maintained at atmospheric pressure by the valve body 11, which communicates with the inlet 3 and the outlet 6, communicates with the fluid chamber 14 into which blow-by gas flows and the atmosphere inlet / outlet 15 through which the atmosphere enters and exits. It is partitioned into an atmospheric chamber 16. The valve body 11 seals between the fluid chamber 14 and the atmospheric chamber 16.
[0026]
The stretchable body 13 is formed in a bellows shape in which crests 13a and troughs 13b are alternately positioned in the axial direction, and can be expanded and contracted in the axial direction, and has elasticity in the axial direction. is doing. Specifically, the stretchable body 13 urges the adjustment valve 12 toward the outlet 6 by a restoring force by an elastic force, and functions as an urging means. Thereby, the regulating valve 12 closes the outlet 6. The stretchable body 13 contracts in the axial direction to separate the adjustment valve 12 from the outlet 6. As a result, the outlet 6 is opened.
[0027]
The regulating valve 12 is formed by a disc-shaped plate member, and is formed by a flat plate portion other than the disc-shaped valve portion 17 and a valve portion 17 that is formed in a convex shape at the center of the plate member and opens and closes the outlet 6. Pressure receiving portion 18. The pressure receiving portion 18 is formed so that a space is formed between the surface on the fluid chamber 14 side and the main body casing 2 even when the valve portion 17 closes the outlet 6. Thereby, the pressure receiving part 18 can receive force from blow-by gas in a direction in which the regulating valve 12 is separated from the outlet 6 even when the valve part 17 closes the outlet 6.
[0028]
Further, the PCV valve device 1 is provided with a coil spring 19 that functions as a compression spring between the pressure receiving portion 18 of the valve body 11 and the inner surface of the main body casing 2. The coil spring 19 has a larger diameter than the outflow port 6 and is disposed so as to surround the outflow port 6. Depending on the setting of the coil spring 19, the initial position, which is the position of the regulating valve 12 in the initial state where the internal combustion engine 4 is not operating, is set to a position away from the outlet 6 or a position where the outlet 6 is closed. Can do. In the present embodiment, the coil spring 19 is set so that the regulating valve 12 is positioned at the position where the outlet 6 is closed in the initial state.
[0029]
In addition, the PCV valve device 1 is provided with an oil separation material 20 at the inlet 3. The oil separation material 20 is formed of a metal wire mesh, and the blow-by gas flowing from the inlet 3 passes through the oil separation material 20. The oil separator 20 captures and removes the oil contained in the blow-by gas passing from the blow-by gas. The removed oil falls downward and passes through the bottom surface of the inlet 3 to the crankcase 5. Returned in.
[0030]
In such a configuration, when the internal combustion engine 4 is driven and the internal pressure of the crankcase 5 is increased by the blow-by gas, the pressure in the fluid chamber 14 is increased by the blow-by gas flowing into the fluid chamber 14 from the inlet 3. When the pressure of the blow-by gas acting on the pressure receiving portion 18 becomes larger than the resultant force of the atmospheric pressure of the atmospheric chamber 16 applied to the pressure receiving portion 18, the urging force of the expansion body 13, and the urging force of the coil spring 19, The expansion / contraction body 13 of the body 11 contracts, whereby the regulating valve 12 moves in a direction to open the outflow port 6 and the outflow port 6 opens. Then, the blow-by gas in the fluid chamber 14 flows out from the outlet 6 to the intake manifold 7 and is returned to the combustion chamber 9. When the pressure of the blow-by gas in the fluid chamber 14 decreases, the expansion / contraction body 13 extends and the adjustment valve 12 moves so as to be close to the outflow port 6. Thus, since the amount of contraction of the expansion and contraction body 13 is determined according to the force received by the pressure receiving part 18 from the blowby gas, it is formed between the valve part 17 and the outlet 6 according to the force received by the pressure receiving part 18 from the blowby gas. The size of the flow path 21 (see FIG. 3) to be changed changes, whereby the flow rate of blow-by gas flowing out from the outlet 6 is adjusted, and the internal pressure of the crankcase 5 is adjusted.
[0031]
Here, when the internal pressure of the crankcase 5 is low, the valve portion 17 closes the outlet 6. Thereby, since the negative pressure due to the suction operation of the intake system of the internal combustion engine 4 does not act on the crankcase 5 when the internal pressure of the crankcase 5 is low, the crankcase 5 enters the crankcase 5 while the internal pressure of the crankcase 5 is low. Damage to each part of the crankcase 5 due to the negative pressure acting is prevented. As a modification, when the outlet 6 communicates with the atmosphere instead of the intake manifold 7, the valve portion 17 closes the outlet 6 when the internal pressure of the crankcase 5 is low. Intrusion of air into the interior 5 is prevented, thereby preventing entry of dust and dirt into the crankcase 5.
[0032]
As described above, in the present embodiment, the cylindrical expansion and contraction body 13 expands and contracts in the axial direction, so that the adjustment valve 12 approaches and separates from the outflow port 6. And since this expansion-contraction body 13 is cylindrical, the full length of the expansion-contraction body 13 can be set long, without enlarging the diameter D2 of the expansion-contraction body 13, Thereby, the diameter D2 of the expansion-contraction body 13 is enlarged. The moving distance of the regulating valve 12 held at one end of the expansion / contraction body 13 can be set longer without increasing the flow rate when the maximum flow rate that can flow out from the outlet 6 is increased. However, it is possible to prevent the PCV valve device 1 from becoming excessively large without excessively increasing the portion not directly related.
[0033]
In addition, since the elastic body 13 has elasticity in the axial direction thereof and functions as an urging means by the restoring force due to this elasticity, it is not necessary to provide the urging means separately from the elastic body 13, The structure of the PCV valve device 1 can be simplified.
[0034]
Further, since the stretchable body 13 is formed in a bellows shape so as to expand and contract in the axial direction, the stretchable body 13 can be realized in a simple shape.
[0035]
In addition, the valve body 11 includes the pressure receiving portion 18 that receives a force from the fluid in a direction that separates the regulating valve 12 from the outlet 6 even when the regulating valve 12 closes the outlet 6. Even if the outlet 6 is located at the closed position, the valve body 11 receives a force from the fluid in the direction of separating the regulating valve 12 from the outlet 6 by the pressure receiving portion 18, so that the regulating valve 12 closes the outlet 6. The valve body 11 can be reliably operated even if it is located at the above position.
[0036]
Further, since the expansion body 13 and the adjustment valve 12 are integrally formed, the number of parts of the valve body 11 including the expansion body 13 and the adjustment valve 12 is reduced, and the expansion body 13 and the adjustment valve 12 are reduced. Therefore, the structure of the valve body 11 can be simplified.
[0037]
Further, since the valve element 11 is pressed by the coil spring 19, the valve element 11 can be prevented from wobbling due to the influence of the flow of blow-by gas. Further, the position of the regulating valve 12 in the initial state can be set to an arbitrary position by setting the coil spring 19.
[0038]
In this embodiment, the example in which the coil spring 19 is set so that the adjustment valve 12 is positioned at the position where the outlet 6 is closed in the initial state has been described. However, the present invention is not limited to this, and the adjustment valve is not limited to the initial state. The coil spring 19 may be set so that 12 is located at a position away from the outlet 6.
[0039]
Next, a second embodiment of the present invention will be described with reference to FIG. Here, FIG. 4 is a perspective view showing the regulating valve 12 of the present embodiment. In addition, the same part as 1st embodiment is shown with the same code | symbol, and description is also abbreviate | omitted.
[0040]
In the present embodiment, the shape of the regulating valve 12 is different from that of the first embodiment. The portion of the regulating valve 12 facing the coil spring 19 on the outlet 6 side, that is, the support portion that supports one end side of the coil spring 19 is formed in an uneven shape. Specifically, the concave portion 31 and the convex portion 32 are radial. Are alternately formed. Then, one end side of the coil spring 19 comes into contact with the convex portion 32. Thus, between the coil spring 19 in contact with the convex portion 32 and the concave portion 31, a valve portion flow path 33 that connects the outside and the inside of the coil spring 19 is formed. Here, the convex portion 32 is formed at a height that does not interfere with the main casing 2 even when the regulating valve 12 closes the outlet 6.
[0041]
In such a configuration, when the coil spring 19 is contracted, the gap at the side of the coil spring 19 becomes small, making it difficult for the blow-by gas to pass through the side of the coil spring 19 and passing through the gap of the coil spring 19. Even in this state, the blow-by gas flows from the outside to the inside of the coil spring 19 in the valve portion flow path 33, so that a predetermined amount of the blow-by gas flowing to the outlet 6 can be secured. it can.
[0042]
【The invention's effect】
According to the pressure regulating device of the first aspect of the present invention, a regulation chamber in which an inflow port through which a fluid flows in, an outflow port through which the fluid flows out, and an atmospheric air inlet / outlet through which the atmosphere enters and exits communicates with each other, and a shaft formed in a cylindrical shape. A valve holder that can expand and contract in the center direction, and an adjustment valve that is provided at an end of the valve holder and that changes the size of the flow path between the outlet and the outlet by approaching and moving away from the outlet. A valve body that divides the adjustment chamber into a fluid chamber in which the inlet and the outlet communicate with each other and an atmospheric chamber in which the atmosphere inlet and outlet communicate with each other and seals between the fluid chamber and the atmosphere chamber And a urging means for urging the valve body in a direction in which the valve holder extends so that the valve holder can be contracted by the pressure of the fluid. Expands and contracts in the axial direction, so that the adjustment valve Since the valve holder is cylindrical, the overall length of the valve holder can be set longer without increasing the diameter of the valve holder, thereby increasing the diameter of the valve holder. It is possible to increase the travel distance of the regulating valve held at the end of the valve holder without increasing the maximum flow rate that can flow out from the outlet. It is possible to prevent the pressure regulating device from becoming excessively large without excessively increasing the portion not directly related.
[0043]
According to a second aspect of the present invention, in the pressure adjusting device according to the first aspect, the valve holder is formed in a bellows shape so as to expand and contract in the axial direction, thereby simplifying the valve holder. Can be realized in a simple shape.
[0044]
According to a third aspect of the present invention, in the pressure regulating device according to the first or second aspect, the valve holding body and the regulating valve are integrally formed, whereby the valve holding body and the regulating valve are formed. Since the number of parts of the provided valve body is reduced and there is no need to provide a coupling member for coupling the valve holder and the regulating valve, the structure of the valve body can be simplified.
[0045]
According to a fourth aspect of the present invention, in the pressure regulating device according to the first, second, or third aspect, a fluid is provided by providing a coil spring that pushes the outlet side of the regulating valve in a direction in which the valve holder contracts. It is possible to prevent the fluctuation of the valve body due to the influence of the flow of the water. Moreover, the initial position of the regulating valve can be set to an arbitrary position by setting the coil spring.
[0046]
According to a fifth aspect of the present invention, in the pressure regulating device according to the fourth aspect, the coil spring is formed to have a larger diameter than the outflow port and is disposed so as to surround the outflow port, and the coil spring is Even when the coil spring is contracted without a gap, a fluid flows from the outside to the inside of the coil spring in the valve section by providing a valve section channel that connects the outside and the inside of the coil spring. Even if the amount of fluid passing through the gap of the coil spring decreases due to contraction, a predetermined amount of fluid flowing to the outlet can be secured.
[0047]
According to a sixth aspect of the present invention, in the pressure regulating device according to the fifth aspect, the support portion of the coil spring of the regulating valve is formed in a concavo-convex shape, and the valve portion flow path is a concave portion in the concavo-convex shape. And the coil spring in contact with the concavo-convex convex part, the valve part flow path can be realized with a simple structure.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing a PCV valve device according to a first embodiment of the present invention together with an internal combustion engine.
FIG. 2 is a longitudinal side view showing a PCV valve device in a state in which a regulating valve is closed.
FIG. 3 is a longitudinal side view showing the PCV valve device in a state in which a control valve is opened.
FIG. 4 is a perspective view showing a regulating valve according to a second embodiment of the present invention.
FIG. 5 is a vertical side view showing a conventional PCV valve device.
[Explanation of symbols]
1 PCV valve device (pressure adjustment device)
3 Inlet 6 Outlet 10 Adjustment chamber 11 Valve body 12 Adjustment valve 13 Telescopic body (valve holder, urging means)
14 Fluid chamber 15 Atmospheric inlet / outlet 16 Atmospheric chamber 19 Coil spring 21 Channel 31 Recessed portion 32 Convex portion 33 Valve portion channel

Claims (6)

A regulation chamber in which an inflow port through which a fluid flows in, an outflow port through which the fluid flows out, and an atmospheric port through which air enters and exits communicate with each other;
A valve holder that is formed in a cylindrical shape and can be expanded and contracted in the axial direction thereof, and a flow path between the outlet and the valve holder that is provided at an end of the valve holder and moves close to and away from the outlet. A regulating valve that changes the height of the fluid chamber, and divides the regulating chamber into a fluid chamber that communicates with the inlet and the outlet, and an atmospheric chamber that communicates with the atmosphere inlet and outlet. A valve body that seals the gap,
An urging means for urging the valve body in a direction in which the valve holder extends, so that the valve holder can be contracted by the pressure of the fluid;
A pressure adjusting device. The pressure regulator according to claim 1, wherein the valve holder is formed in a bellows shape so as to expand and contract in the axial direction. The pressure regulator according to claim 1 or 2, wherein the valve holder and the regulating valve are integrally formed. The pressure regulating device according to claim 1, 2 or 3, further comprising a coil spring that pushes the outlet side of the regulating valve in a direction in which the valve holder contracts. The coil spring is formed so as to have a larger diameter than the outlet and is disposed so as to surround the outlet.
The pressure adjusting device according to claim 4, further comprising a valve portion flow path that connects an outer side and an inner side of the coil spring even when the coil spring is contracted without a gap. The support portion of the coil spring of the regulating valve is formed in an uneven shape,
The pressure regulating device according to claim 5, wherein the valve portion flow path is formed between the concave-convex concave portion and the coil spring that contacts the convex-concave convex portion.

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