JP2004144085A - Pressure regulating valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crank casing degassing device requiring only one pressure regulating valve for a first degassing conduit section and a second degassing conduit section. <P>SOLUTION: The known crank case degassing device comprises the pressure regulating valve provided in the first degassing conduit section and another pressure regulating valve or an orifice provided in the second degassing conduit section. The first and second degassing conduit sections 8.1, 8.2 are connected to only one pressure regulating valve 2. The pressure regulating valve 2 has a valve seat 53 to be cooperated with a valve element and the valve seat has first and second outlet passages 29, 30. The second outlet passage 30 is arranged coaxially on the outer periphery of the first outlet passage 29. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a pressure regulating valve for regulating the pressure in a crank casing of an automobile, wherein the casing is provided, a valve seat is disposed in the casing, and a valve body is movably supported. Regarding what is in the form.

DE-A-195 01 471 discloses a pressure regulating valve for venting crankcase casings. In an internal combustion engine with a turbocharger, the crankcase venting device is connected via a first venting line section in order to be able to continuously vent blow-by gas from the crankcase into the intake pipe. It must not only be connected upstream of the turbocharger to the intake pipe, but also to the intake pipe downstream of the turbocharger via a second degassing conduit section. In order to be able to regulate the pressure in the crankcase in an internal combustion engine with a turbocharger, one pressure regulating valve is provided in the first venting line section and the second venting line section is provided. Another pressure regulating valve or orifice is required. This means high manufacturing costs, high space requirements and assembly costs.
German Patent Publication No. 1950147

It is an object of the present invention to provide a pressure regulating valve for a crankcase degassing device without the above-mentioned high production costs, high space requirements and assembly costs.

According to the invention, this object is achieved by a pressure regulating valve of the type described at the outset, in which the valve seat is provided with a first outlet passage and a second outlet passage.

An advantage of the pressure regulating valve according to the invention with the features of claim 1 over the prior art is that only one pressure regulating valve is provided for the first venting section and the second venting section. Only that it is needed. The orifice in the second venting conduit section can also be omitted. This is obtained because the valve seat of the pressure regulating valve according to the invention has a first outlet passage and a second outlet passage.

According to the measures recited in the claims below, advantageous embodiments and improvements of the pressure regulating valve described in claim 1 are possible.

It is particularly advantageous to arrange the first outlet passage centrally on the axis and the second outlet passage coaxially to the first outlet passage and annularly around and outside the first outlet passage. It is. This arrangement is particularly advantageous because in this way the first outlet passage and the second outlet passage can be closed simultaneously by one valve element.

Advantageously, the cross section of the first outlet passage is smaller than the cross section of the second outlet passage. That is, the negative pressure in the first outlet passage is, for example, 600 mbar except for the operation of the turbocharger, and the negative pressure in the second outlet passage is, for example, 100 mbar during the operation of the turbocharger. This is because it is significantly larger than. To ensure that the forces acting on the valve element due to the negative pressure in all operating states are approximately the same, the cross section of the second outlet passage is inversely proportional to the cross section of the first outlet passage. Must be large in relation to.

Furthermore, it prevents the crankcase from being loaded by the pressure created by the turbocharger during operation of the turbocharger, and on the other side, from the intake pipe upstream of the turbocharger via the pressure regulating valve via the pressure regulating valve The first outlet passage has a first outlet connection with a first check valve, and the second outlet passage has a first outlet connection for interrupting a short-circuit flow flowing into the intake pipe downstream of the regulating valve. Advantageously, a second outlet connection with a second check valve is arranged correspondingly.

と Advantageously, the pressure regulating valve is formed as a diaphragm valve. This is because diaphragm valves are extremely cheap to manufacture, reliable and space-saving.

Advantageously, the pressure regulating valve is connected to the oil separating device. This results in a very compact, space-saving and convenient mounting arrangement.

Furthermore, it is advantageous that the pressure regulating valve is provided separately from other devices because of the geometry of the internal combustion engine.

Next, an embodiment of the present invention is shown in the drawings and will be described in detail in the following description.

FIG. 1 schematically shows an apparatus for venting a crankcase with a pressure regulating valve according to the invention.

(4) During operation of the internal combustion engine 6, gas flows from the combustion chamber of the internal combustion engine 6 into the crank casing 1 due to a small leak gap between the piston, the piston ring, and the cylinder sliding surface. The crank casing 1 is a part of the internal combustion engine 6. This gas that escaped from the combustion chamber through the leak gap is called blow-through gas or blow-by gas. In the following, the concept of gas alone is also used for blow-by gas. Since a pressure rise occurs in the crank casing 1 through the leakage gap, it is necessary to perform pressure balancing by so-called crank casing degassing. Because the gas has a high concentration of hydrocarbons, it can no longer be released to the atmosphere. Instead, the crankcase gas is guided into the intake pipe 3 of the internal combustion engine 6 and is used there for combustion. Due to the high speed of the gas flowing into the crank casing 1 and the movement of the parts inside the crank casing 1, the blow-by gas is composed of an oil mist containing many large and small oil particles. In order to avoid oil loss, these oil particles are separated by an oil separating device prior to being guided into the intake pipe 3 during degassing of the crankcase. The oil separating device comprises in a known manner, for example, a coarse separator 4 and a fine separator 5. The gas is pressure regulated from the crankcase 1 via a vent line 8 into the coarse separator 4, from there via the first passage 9 into the fine separator 5 and thereafter via the second passage 10. Guided to valve 2. From there, depending on the operating state of the internal combustion engine, the gas flows downstream of the turbocharger 15 and the throttle valve 16 via the first check valve 12 and the first vent line section 8.1. 3 or via a second check valve 13 and a second vent line section 8.2 into the intake pipe 3 upstream of the turbocharger 15.

The coarse separator 4 comprises, for example, a plenum chamber or at least one helical chamber. The fine separator 5 is made of, for example, a fiber fleece.

The first check valve 12 is closed when the turbocharger 15 is operating. The turbocharger 5 forms an overpressure in the intake pipe 3 downstream thereof. By closing the first check valve 12, it is possible to prevent the intake air from flowing into the crank casing 1 from the intake pipe 3 due to the overpressure in the intake pipe 3. The second check valve 13 is opened at the same time as the first check valve 12 is closed, so that a slight pressure in the intake pipe upstream of the turbocharger 15 causes gas to escape from the crank casing 1. 2 are drawn into the degassing conduit section 8.2. In this manner, gas can be vented from the crank casing 1 into the intake pipe 3 even when the turbocharger 15 is operating.

で は Except for the operation of the turbocharger 15, a negative pressure prevails in the intake pipe 3 downstream of the turbocharger 15, and this negative pressure opens the first check valve 12. In addition, this negative pressure in the intake pipe 3 also prevails in the first vent line section 8.1 and in the second vent line section 8.2. However, the negative pressure in the second vent line section 8.2 is due to the pressure loss increasing in the intake pipe 3 in the direction opposite to the flow direction and the pressure loss in the turbocharger 15. , Which is slightly less than the negative pressure in the first vent line section 8.1, so that the resulting pressure difference closes the second check valve 13. As a result, instead of passing through the turbocharger 15, the intake pipe 3 upstream of the turbocharger 15 passes through the second degassing conduit section 8.2 and the first degassing conduit section 8.1. As a result, the short-circuit flow flowing into the intake pipe 3 downstream of the turbocharger 15 is prevented.

装置 In the device according to FIG. 2, the same or similarly acting parts in the device according to FIG. 1 are denoted by the same reference symbols. FIG. 2 is a perspective view of the oil separating device 18 incorporating the pressure regulating valve according to the present invention. The oil separating device 18 has a casing 19 fixed to the crank casing 1 by, for example, screws. In the casing 19, for example, the coarse separator 4, the fine separator 5, and the pressure regulating valve 2 according to the present invention are arranged. The casing 19 is provided, for example, with a connection 20 by means of which gas can be guided from the camshaft chamber of the crankcase 1 into the oil separating device 18. The casing 19 is made of plastic and is made, for example, by injection molding.

装置 In the device according to FIG. 3, the same or similarly acting parts in the device according to FIGS. 1 and 2 are denoted by the same reference symbols.

FIG. 3 shows the oil separating device 18 in a longitudinal section together with the pressure regulating valve 2 according to the present invention. The pressure regulating valve 2 according to the invention is advantageously inserted into the crankcase venting device in order to regulate the pressure in the crankcase to a constant, predefined value by means of a spring force. However, it is also possible for the pressure regulating valve 2 according to the invention to be separated and inserted into other areas for pressure regulation.

(4) Since the pressure in the intake pipe 3 of the internal combustion engine fluctuates remarkably and the crank casing 1 communicates with the intake pipe 3 at the time of degassing, the pressure fluctuation spreads into the crank casing 1. In order to avoid this, a pressure regulating valve 2 for keeping the pressure in the crank casing 1 substantially constant is provided.

The pressure regulating valve 2 according to the invention has a housing 19.1, which is, for example, integrally connected to the housing 19 of the oil separating device 18. The oil separating device 18 has, for example, a two-layer fiber fleece 21 as a fine separator 5 which is compressed between two support grids 17 and in a casing 19 in a first passage 9. And the second passage 10. The pressure regulating valve 2 communicates at least indirectly with the crank casing 1 via the second passage 10 on the inlet side, and at least indirectly communicates with the first outlet connection 22 at least indirectly with the intake pipe 3. A second outlet connection portion indirectly communicating with the intake pipe;

The housing 19.1 of the pressure regulating valve 2 comprises, for example, a cup-shaped section 24 having a bottom 27 and a cylindrical section 28, and a cover 25. The cup-shaped section 24 and the cover 25 close one internal chamber 26. A second passage 10, a first outlet passage 29, and a second outlet passage 30 are open in the inner chamber 26.

The first outlet passage 29 extends along the axis 31 of the cup-shaped section 24 at the center of the bottom 27, starting from the inside 32 of the bottom 27 facing the cover 25. The cup-shaped section 24 and the cover 25 have, for example, a circular cross section. However, this cross section may be square or elliptical. The second outlet passage 30 extends from the inside 32 of the bottom 27, outside the first outlet passage 28, around the inside of the bottom 27, for example annularly, and coaxially with the first outlet passage 29. ing. The second outlet passage 30 has, for example, an annular cross section. However, the cross section of the second outlet passage 30 may be square or elliptical. The first outlet passage 29 and the second outlet passage 30 are separated from each other by a cylindrical passage wall 33 and have cross sections of different sizes. In that case, for example, the cross section of the first outlet passage 29 is smaller than the cross section of the second outlet passage 30. The first outlet passage 29 extends within the straight section 36 starting from the inside 32 of the bottom 27 and then abruptly expands its cross section into a bent section 37 which is bent 90 degrees with respect to this straight section 36. I have. The cross section of the bent section 37 is, for example, circular. The second outlet passage 30 extends coaxially with the straight section 36 of the first outlet passage 29 in a linear annular section 38 starting from the inside 32 and is circular after a 90 degree deflection 39. Moving into section 40, the circular section is perpendicular to a straight section 36 of first outlet passage 29 and is no longer coaxially oriented with respect to this straight section 36. The circular section 40 of the second exit passage 30 is located alongside the bent section 37 of the first circular exit passage 29. At the end of the circular section 40 of the second outlet passage 30 a second outlet connection 23 is provided. A first outlet connection 22 is arranged at the end of the bent section 37 of the first outlet passage 29. The first outlet connection 22 and the second outlet connection 23 have an annular ridge 42 on the outer circumference of their end opposite to the pressure regulating valve 2 for a secure fixing of the hose. I have. The two outlet connections 22, 23, for example, consist of several parts and are provided on the housing 19.1 of the pressure regulating valve 2 and are fixed, for example, by injection, gluing or screws. However, these outlet connections can also consist of one part and be arranged in the housing 19.1. The first outlet connection 22 has a first check valve 12, and the second outlet connection 23 has a second check valve 13. The first check valve 12 has a first shield-like check body 46 having a first shield 46.1 and a first shield holder 46.2, and a second check valve. The valve 13 has a second shield-shaped check body 45 with a second shield 45.1 and a second shield holder 45.1. Both shield holders 45.2, 46.2 of both check bodies 45, 46 penetrate through respective receiving holes 56 of webs 47, 48 arranged inside outlet connections 22, 23, respectively. A snap hook 73 provided on both shield holders 45.2, 46.2 engages behind receiving hole 56. In this manner, both shields 45.1, 46.1 abut webs 47, 48 and are secured by snap hooks 73. The webs 47, 48 have web openings 47.1, 48.1, through which the blow-by gas can flow in their open state, and which are in their closed state. Are closed tightly on the sides of the shields 45.1, 46.1 facing the webs 47, 48. When both check valves 12, 13 flow through towards the intake pipe 3, the shields 45.1, 46.1 are each elastically bent in the direction of flow, so that the web openings 47.1, 48. .1 are released. If the medium flows from the intake pipe 3 into the two check valves 12, 13 in the opposite direction to the direction toward the intake pipe 3, or if the medium does not flow, the shields 45.1 and 46.1 will immediately re-apply. It abuts the webs 47, 48, thereby closing the web openings 47.1, 48.1 again. Both the check bodies 45, 46 are made of, for example, soft rubber.

The position of the two outlet connections 22, 23 in the housing 19.1 can be adapted to the respective installation requirements of the internal combustion engine. The two outlet connections 22, 23 extend away from the casing 19 in FIG. 2, for example, in the same direction. However, the outlet connection portions 22 and 23 may be rotated between plus 90 degrees and minus 90 degrees with respect to a position facing in the direction shown in FIG. 2, may be downward, or may have different directions from each other. May be extended.

The second passage 10 opens into the inner chamber 26 of the pressure regulating valve 2 at a corner section 51 which extends laterally over part of the circumference of the cup-shaped section 24;

The cover 25 is arranged at the open end of the cup-shaped section 24 on the side opposite to the casing 19.1. The cover 25 is, for example, snap-fitted onto the cup-shaped section 24. To that end, a plurality of snap hooks 65 are distributed and arranged around the end of the cylindrical section 28 facing the cover 25. For example, a U-shaped coupling member 66 having a notch 68 is distributed and arranged on the outer periphery of the cover 25 at the same circumferential position as the snap hook 65, in which case the coupling member 66 is provided at the cover edge. It engages in the direction of the bottom 27 beyond 67. The snap hook 65 engages into the notch 68 when the cover 25 is fitted over the cup-shaped section 24. However, the cover 25 may be screwed or glued on the cup-shaped section 24.

弁 A valve body 52 is provided in the inner chamber 26, and the valve body cooperates with a valve seat 53. The pressure regulating valve 2 comprises, for example, a diaphragm valve, so that the valve body 52 comprises, for example, a rubber diaphragm or a part thereof. The valve seat 53 is arranged coaxially with respect to the axis 31 like the valve body 52, and the passage wall 33 of the first outlet passage 29 ending at the inside 32 of the bottom 27, and the inside of the bottom 27. 32 and a region surrounding the second outlet passage 30. Diaphragm 52 is clamped between the end of cylindrical section 28 opposite bottom 27 and cover 25. The diaphragm 52 is furthermore fixed at its clamping rim 49 in an annular clamping groove 50 arranged on the outer circumference of the end of the cylindrical section 28 opposite the bottom 27. The diaphragm 52 has a thick dish 54 in the radial area of the valve seat 53, which transitions into a relatively thin corrugated section 55 outside of the thick dish. The dish-shaped thick section 54 of the diaphragm 52 is movably supported by a corrugated section 55 and, in the closed state of the pressure regulating valve 2, abuts against the inside 32 of the bottom 27 in the region of the valve seat 53, The dish-shaped thick portion covers the first outlet passage 29 and the second outlet passage 30 densely with each other, and also covers both the outlet passages tightly with the second passage 10. In the open state of the pressure adjusting valve 2, the dish-shaped thick portion 54 does not come into contact with the inside 32, and is located between the inside 32 and the cover 25 or in contact with the cover 25. On the inner side 32 of the bottom 27 there is provided an annular groove 57 coaxial with the first outlet passage 29, which annular groove extends outside the second outlet passage 30. A valve return spring 58 is located at one end in the annular groove 57 and abuts against the dish-shaped thick portion 54 at the other end facing the cover 25, and the dish-shaped thick portion 54 Are guided and supported in the axial direction by a lower step 59. The valve return spring 58 loads the valve body 52 toward the cover 25. On the upper side of the dish-shaped thick portion facing the cover 25, dot-shaped raised portions 60 are provided, and these raised portions are formed by the dish-shaped thick portion 54 on the cover 25 when the pressure regulating valve 2 is opened. Buffers collisions. In addition, the dot-shaped ridges 60 avoid unwanted adhesion of the dish-shaped thick portion 54 to the cover 25.

The diaphragm 52 divides the inner chamber of the pressure regulating valve 2 into a valve chamber 61 and a ventilation chamber 62. The valve chamber 61 is limited by the cup-shaped section 24 and the lower side of the diaphragm 52, and the ventilation chamber 62 is limited by the cover 25 and the upper side of the diaphragm 52. The valve chamber 61 and the ventilation chamber 62 are tightly closed with each other. The ventilation chamber 62 communicates with the atmosphere through a ventilation port 63 provided in the cover 25, and as a result, a pressure balance between the ventilation chamber 62 and the atmosphere is established through the ventilation port 63. The cover 25 is provided with a ventilation cover 64 so as to protect the ventilation hole 63 from water repellency. As a result, intrusion of water into the ventilation chamber 62 of the pressure regulating valve 2 is prevented. The ventilation cover 64 is, for example, rectangular and is mounted above the ventilation opening 63 on the cover 25 and forms a ventilation passage 69 together with the cover 25. The ventilation passage has a radius starting from the ventilation opening 36. Direction outwardly toward the edge of the cover 25, from which it bends downwards and extends in the direction of the cover collar 70 of the cover 25 and at its open end to the cover edge 67 from above. I'm wearing

で は The force balance is adjusted in the diaphragm 52. Depending on the balance of this force, the pressure regulating valve 2 is opened or closed. By the predetermined force of the valve return spring 58 and the size of the cross section of the first and second outlet passages 29, 30, the value of the pressure constantly maintained in the crank casing 1 by the pressure adjusting valve 2 is adjusted. You.

The balance of the forces includes the pressure in the crankcase 1, the atmospheric pressure, the pressure in the first outlet passage 29 outside the operation of the turbocharger 15, and the second pressure during the operation of the turbocharger. And the spring force of the valve return spring 58 are involved. The pressure in the first outlet passage 29 and the pressure in the second outlet passage 30 exert a force for closing the pressure regulating valve 2 due to the negative pressure that prevails there. The overpressure in 1 acts in the direction of opening the pressure regulating valve via the second passage 10, and the force of the valve return spring 58 also acts in the direction of opening the pressure regulating valve 2. The first check valve 12 is closed during operation of the turbocharger 15, so that only the negative pressure in the intake pipe 3 upstream of the turbocharger 15 is passed through the second outlet passage 30 to the diaphragm. 52. When the turbocharger 15 is not operating, the second check valve 13 is closed. As a result, only the negative pressure of the intake pipe 3 downstream of the turbocharger 15 is applied to the diaphragm 52 via the first outlet passage 29. Works.

The negative pressure in the first outlet passage 29 is, for example, 600 mbar outside the operation of the turbocharger 15, and the negative pressure in the second outlet passage 30 during the operation of the turbocharger 15 is, for example, 100 mbar. It is remarkably large as compared with. The closing force of the pressure regulating valve 2 is almost independent of the operating state of the internal combustion engine, so that the pressure in the crankcase 1 can be adjusted to the same constant value independently of the operating state of the internal combustion engine. Since the force is calculated as the product of the pressure and the area, the cross section of the first outlet passage 29, which is loaded by a relatively high negative pressure, is equal to the second outlet passage 30 which is loaded by a relatively slight negative pressure. Must be inversely proportional to the cross section of The cross section of the first outlet passage 29 is therefore smaller by a proportional factor than the cross section of the second outlet passage 30. This proportional coefficient is calculated from the quotient of the pressure in the second outlet passage 30 and the pressure in the first outlet passage 29.

The gas flows from the crankcase 1 into the oil separator 18 and there through the coarse separator 4, for example one or more helical chambers, and the fine separator 5, for example a fiber fleece 21, via the second passage 10. It flows into the valve chamber 61. When the internal combustion engine is not operating, and when the negative pressure of the intake pipe 3 is not acting via the first outlet passage 29 and the second outlet passage 30, the pressure regulating valve 2 is fully opened, The valve body 52 contacts the inside of the cover 25. As the negative pressure in the intake pipe 3 increases during operation of the internal combustion engine, the pressure regulating valve is further closed, and the valve body 52 approaches the valve seat 53. When the negative pressure in the intake pipe 3 exceeds a predetermined value, the pressure regulating valve 2 is fully closed. This causes the pressure in the crankcase 1 to rise, so that the valve body 52 eventually leaves the valve seat again in accordance with the balance of the forces, and gas is released during operation of the turbocharger 15. Can be vented into the intake pipe 3 via the second outlet passage 30 or via the first outlet passage 29 when the turbocharger 15 is not operating.

1 is a simplified view of an apparatus for venting a crankcase provided with a pressure regulating valve according to the present invention.

1 is a perspective view of an oil separating device incorporating a pressure regulating valve according to the present invention.

1 is a longitudinal sectional view of an oil separating device together with a pressure regulating valve according to the present invention.

Explanation of reference numerals

1} Crank casing, {2} pressure regulating valve, {3} intake pipe, {4} coarse separator, {5} fine separator, {6} internal combustion engine, {8} vent line, {8.1} first vent line segment, {8.2} second gas Drain pipe section, {9} first passage, {10} second passage, {12, 13} check valve, {15} turbocharger, {16} throttle valve, {17} support grid, {18} oil separator, {19} casing, {19.1} casing, 20} connection, 21} fiber fleece, {22} first outlet connection, {23} second outlet connection, {24} cup-shaped section, {25} cover, {26} inner chamber, {27} bottom, {28} cylindrical section, {29} first outlet passage {30} second outlet passage, {31} axis, {32} inside, {33} passage wall, {36} Linear section, {37} bent section, {38} linear annular section, {39} deflection, {40} circular section, {42} annular ridge, {45} first non-return body, {45.1} first shield, {45.2} first shield Retainer, {46} second non-return body, {46.1} second shield, {46.2} second shield retainer, {47} web, {47.1} web opening, {48} web, {48.1} web opening, {49} tightening edge , {50} tightening groove, {51} square section, {52} valve body (diaphragm), {53} valve seat, {54} dish-shaped thick section, {55} corrugated section, {56} receiving opening, {57} annular groove, {58} valve return spring, {59} step section, {60} point Ridge, {61} valve chamber, {62} gas vent chamber, {63} gas vent opening, {64} gas vent cover, {65} Nap hook 66 coupling member, 67 cover edges 68 notches, 69 venting passage 70 cover Color

Claims (10)

A pressure regulating valve for regulating a pressure in a crankcase of an automobile, wherein the casing is provided, a valve seat is disposed in the casing, and a valve body is movably supported. A pressure regulating valve of the type wherein the valve seat (53) is provided with a first outlet passage (29) and a second outlet passage (30). The pressure regulating valve according to claim 1, wherein the first outlet passage (29) is arranged coaxially with the axis (31) of the casing (19.1). 2. The method according to claim 1, wherein the second outlet passage is arranged coaxially with the first outlet passage and annularly around and outside the first outlet passage. Pressure regulating valve. The pressure regulating valve according to claim 1, wherein the cross section of the first outlet passage (29) is smaller than the cross section of the second outlet passage (30) by a proportional coefficient. 5. A pressure regulating valve according to claim 4, wherein the proportionality coefficient is formed by the quotient of the pressure in the second outlet passage and the pressure in the first outlet passage. The pressure regulating valve according to claim 1, wherein the pressure regulating valve (2) has a diaphragm (52) as its valve body. A first outlet connection (22) with a first check valve (12) is provided in the first outlet passage (29) and a second check valve is provided in the second outlet passage (30). 2. The pressure regulating valve according to claim 1, wherein a second outlet connection (23) with (13) is arranged. 7. The pressure regulating valve according to claim 6, wherein the valve body (52) has a dish-shaped thick portion in the diaphragm (52) and cooperates with the valve return spring (58). The pressure regulating valve according to claim 1, wherein the pressure regulating valve (2) is integrally connected to the oil separating device (18). The pressure regulating valve according to claim 1, wherein the pressure regulating valve (2) is provided as a separate part separated from other devices.

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