US20150292374A1 - Pcv valve mounting structure - Google Patents
Pcv valve mounting structure Download PDFInfo
- Publication number
- US20150292374A1 US20150292374A1 US14/443,099 US201314443099A US2015292374A1 US 20150292374 A1 US20150292374 A1 US 20150292374A1 US 201314443099 A US201314443099 A US 201314443099A US 2015292374 A1 US2015292374 A1 US 2015292374A1
- Authority
- US
- United States
- Prior art keywords
- valve
- pcv valve
- resin cover
- valve mounting
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 36
- 239000002184 metal Substances 0.000 claims abstract description 36
- 239000011347 resin Substances 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 claims abstract description 23
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 9
- 239000000446 fuel Substances 0.000 description 6
- 239000003595 mist Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000036544 posture Effects 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/0011—Breather valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/006—Camshaft or pushrod housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/0011—Breather valves
- F01M2013/0027—Breather valves with a de-icing or defrosting system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0422—Separating oil and gas with a centrifuge device
- F01M2013/0427—Separating oil and gas with a centrifuge device the centrifuge device having no rotating part, e.g. cyclone
Definitions
- a PCV valve In recirculating a blow-by gas to an induction system, a PCV valve is provided to adjust flow amount of the recirculation.
- the blow-by gas corresponds to gas leaking out from a combustion chamber to an inside of a crankcase in compression/combustion processes of an internal combustion engine, for example.
- the PCV valve is provided at an outside of a cylinder head and the PCV valve itself is exposed to outside air, moisture included in the blow-by gas attaches to the PCV valve and freezes especially in cold weather, and accordingly the PCV valve may be prevented from operating normally.
- the PCV valve is mounted on a cover forming an internal space portion between the cover and the cylinder head so that the frozen moisture can be defrosted with heat generated at the internal combustion engine.
- the cover is formed by metal having a high coefficient of thermal conductivity, including, for example, aluminum alloy
- the heat generated at the internal combustion engine is efficiently transmitted to the PCV valve via the cover made of the metal, and accordingly the frozen moisture can be defrosted promptly.
- the cover is formed by resin having a lower coefficient of thermal conductivity compared to the metal, efficiency of defrosting the frozen moisture is decreased.
- a PCV valve mounting structure which allows heat generated at an internal combustion engine to be efficiently transmitted to the PCV valve mounted on a resin cover.
- a portion of the PCV valve is formed by metal whose coefficient of thermal conductivity is high. It is configured in such a manner that efficiency of heat transfer to the PCV valve is enhanced and the frozen moisture is defrosted by heating the metal portion with heat possessed by hot temperature atmosphere of the internal space portion.
- Patent document 1 JP2009-150289A
- manufacturing cost of the PCV valve formed with the metal portion exposed to the internal space portion between the cylinder head and the resin cover is higher compared to a PCV valve which does not include such metal portion and whole of which is made of resin, for example.
- the PCV valve is designed depending on a type of an internal combustion engine, also such metal portion needs to be designed for each PCV valve. Accordingly, in providing the PCV valve, inconvenience occurs in aspects of a manufacturing efficiency and costs.
- the present invention is made in view of the above-described circumstances, and an object is to provide a PCV valve mounting structure which efficiently transmits heat generated at an internal combustion engine and releases freezing promptly even in a case where the PCV valve is made of resin.
- the PCV valve mounting structure includes a resin cover forming an internal space portion between the resin cover and a cylinder head of an internal combustion engine, a valve mounting through hole formed at the resin cover, a PCV valve including a valve case portion inserted through the valve mounting through hole from outside the resin cover, and a metal fixture threadedly engaged, from inside the resin cover, with the valve case portion inserted through the valve mounting through hole, at least part of the metal fixture being exposed to the internal space portion.
- the metal fixture threadedly engaged with the valve case portion inserted through the through hole is exposed to the internal space portion, and the metal fixture can be heated with heat possessed by hot temperature atmosphere of the internal space portion.
- the foregoing metal fixture is applicable to any PCV valve or to any valve case portion, and can be used as a common part. Therefore, the PCV valve itself can be manufactured inexpensively without using metal. In addition, the use of the common metal fixture reduces a manufacturing unit price and makes an inventory control easy, thereby even more increasing efficiency of the PCV valve mounting structure.
- An aspect of the PCV valve mounting structure of the present invention is that the metal fixture is integrally provided with a cylindrical screw portion which is insert molded in the resin cover and a heat receiving portion extended from the cylindrical screw portion to protrude into the internal space portion, and the valve case portion is provided with a screw portion threadedly engaging with the cylindrical screw portion.
- the PCV valve can be mounted on the resin cover conveniently.
- the heat receiving portion protruding into the internal space portion is provided to extend from the cylindrical screw portion, and thus a large area for receiving the heat can be assured. Consequently, the heat possessed by the hot temperature atmosphere of the internal space portion is received at the large area for receiving the heat, and accordingly the cylindrical screw portion can be heated.
- a freeze protection effect can be even more enhanced.
- FIG. 1 Cross-sectional view of an internal combustion engine provided with a PCV valve
- FIG. 2 Cross-sectional view illustrating a PCV valve mounting structure
- FIG. 3 Cross-sectional view illustrating a PCV valve mounting structure of a second embodiment
- FIG. 1 and FIG. 2 illustrate an engine (an internal combustion engine) E provided with a PCV valve mounting structure of the present embodiment.
- the engine E includes a cylinder head 1 , a cylinder block 2 , a crankcase 3 and an oil pan 4 which are placed up and down to be arranged one above another, and are connected to one another.
- a cylinder head cover 5 is provided at an upper portion of the cylinder head 1 .
- the cylinder head cover 5 is made of resin including nylon, for example.
- a crankshaft 6 is rotatably supported inside the crankcase 3 and pistons 7 are slidably fitted into plural cylinder bores formed at the cylinder block 2 .
- the pistons 7 and the crankshaft 6 are connected to each other with connecting rods 8 .
- An air intake valve 9 and an exhaust valve 10 are provided at the cylinder head 1 to be able to open and close.
- An intake cam shaft 11 and an exhaust cam shaft 12 which are in postures that are parallel to the crankshaft 6 , are rotatably supported at upper positions of the air intake valve 9 and the air exhaust valve 10 .
- An intake manifold 14 is connected to one lateral surface of the cylinder head 1
- an exhaust manifold 15 is connected to the other lateral surface of the cylinder head 1 .
- a spark plug 16 igniting air-fuel mixture of a combustion chamber 20 is provided at an upper surface of the cylinder head 1 .
- An injector 17 supplying fuel to the combustion chamber 20 is provided at an air intake passage provided at the cylinder head 1 and the intake manifold 14 is connected to the air intake passage.
- a surge tank 18 is provided at an upstream-side relative to the intake manifold 14 and a throttle valve 19 is further provided at an upstream-side relative to the surge tank 18 .
- an endless chain is wrapped along a crankshaft sprocket provided at a shaft end of the crankshaft 6 and cam sprockets provided at shaft ends of the respective intake cam shaft 11 and exhaust cam shaft 12 so that the intake cam shaft 11 and the exhaust cam shaft 12 are rotated synchronously with rotations of the crankshaft 6 .
- the spark plug 16 and the injector 17 are provided to be controlled by a control apparatus (not shown) including ECU, for example.
- the intake cam shaft 11 and the exhaust cam shaft 12 rotate synchronously with the rotations of the crankshaft 6 , thereby opening an intake port of the air intake valve 9 due to a compressive force from a cam portion of an outer circumference of the intake cam shaft 11 at a predetermined timing.
- an exhaust port of the exhaust valve 10 is opened due to a compressive force from a cam portion of an outer circumference of the exhaust cam shaft 12 at a predetermined timing.
- the control apparatus conducts control so that the injector 17 supplies the fuel to the combustion chamber 20 at the predetermined timing at which the intake valve 9 opens and that the spark plug 16 ignites the air-fuel mixture at a predetermined timing at which the air-fuel mixture of the combustion chamber 20 is compressed.
- feed oil pipes 21 are arranged above the respective intake cam shaft 11 and exhaust cam shaft 12 to be in postures parallel to the cam shafts 11 and 12 .
- Spray nozzles 21 A spraying oil downwardly are provided at the feed oil pipes 21 .
- the oil supplied by a hydraulic pump (not shown) to each of the feed oil pipes 21 is sprayed from the spray nozzles 21 A to the intake cam shaft 11 and the exhaust cam shaft 12 .
- a discharge port discharging the oil is formed at the cylinder head 1 and an oil passage returning the oil, which is discharged from the discharge port, to the oil pan 4 is formed at the cylinder head 1 .
- the engine E When the engine E is operating, part of mixed gas introduced to the combustion chamber 20 leaks out to a crank chamber 13 from a gap between an outer circumference of the piston 7 and an inner circumference of the corresponding cylinder.
- the unburnt mixed gas that has leaked in this way is referred to as the blow-by gas.
- the engine E is provided with a blow-by gas recirculation apparatus recirculating the blow-by gas to the induction system of the engine E and introducing the blow-by gas, together with new mixed gas, to the combustion chamber 20 so that the introduced gas is burnt thereat.
- the blow-by gas recirculation apparatus supplies the blow-by gas occurring in the crank chamber 13 to an oil separator 40 provided at an upper portion of the cylinder head cover 5 via a gas extract path 22 .
- the blow-by gas recirculation apparatus transports the blow-by gas, from which oil mist is separated, to a gas space portion S and stores the blow-by gas thereat.
- the blow-by gas stored at the gas space portion S is sent to a gas return path 23 via a PCV valve 30 , and is returned to the induction system (specifically, the surge tank 18 ) of the engine E to be combusted in the combustion chamber 20 together with the air-fuel mixture.
- the oil separator 40 is fixed at an upper surface of the cylinder head cover 5 while sandwiching a gasket 24 , and the oil separator 40 includes inside thereof a cyclone-type separation unit 43 separating and removing the oil mist included in the blow-by gas.
- the oil separator 40 is integrally provided with an upper part case portion 41 and a lower part case portion 42 , and the gas space portion (an internal space portion) S is formed at an inside of the upper part case portion 41 and the separation unit 43 is provided at an inside of the lower part case portion 42 .
- a dividing wall 44 is formed at an intermediate portion between the upper part case portion 41 and the lower part case portion 42 , and a supply space portion T is formed at an outer circumference-side of the separation unit 43 at a lower side relative to the dividing wall 44 .
- each of the upper part case portion 41 , the lower part case portion 42 , the separation unit 43 and the dividing wall 44 is formed by resin material including nylon, for example.
- the separation unit 43 includes a cylindrical portion 43 A and a funnel-shaped portion 43 B integrally formed at a lower side of the cylindrical portion 43 A.
- the separation unit 43 is provided with an opening portion 43 H formed at an outer circumference of the cylindrical portion 43 A to be in communication with the supply space portion T.
- the separation unit 43 is provided with a hole portion 43 C formed at a lower end of the funnel-shaped portion 43 B to be in communication with an inside of the cylinder head cover 5 .
- a through hole 44 A is formed at the dividing wall 44 that is at an upper position of the cylindrical portion 43 A of the separation unit 43 .
- the gas including therein the oil mist is introduced from the opening portion 43 H to an inside of the cylindrical portion 43 A of the separation unit 43 in a tangential direction, and accordingly the gas swirls as the gas is introduced thereto.
- the oil mist is gathered, collected and separated by an effect of centrifugal force due to the swirling of the gas.
- the gathered and collected oil mist is sent from an inner surface of the funnel-shaped portion 43 B to the hole portion 43 C, and then is sent out to the inside of the cylinder head cover 5 via the hole portion 43 C.
- the blow-by gas from which the oil mist has been removed is led from the through hole 44 A of the dividing wall 44 to the gas space portion S.
- the PCV valve 30 is mounted on the upper part case portion 41 in a state where the PCV valve 30 is in communication with the gas space portion (the internal space portion) S of the upper part case portion 41 .
- the upper part case portion 41 serves as a resin cover which forms, together with the cylinder head cover 5 , the internal space portion (the gas space portion S) between the upper part case portion 41 and the cylinder head 1 of the engine E, and a valve mounting through hole 41 A is formed at the upper part case portion 41 to be transversely arranged.
- the PCV valve 30 is provided with a valve main body 31 , a valve body 32 accommodated inside the valve main body 31 , a support member 33 preventing the valve body 32 from falling off the valve main body 31 and a spring 34 biasing the valve body 32 in a close direction.
- a hole portion 33 A is formed at the support member 33 .
- the valve main body 31 is integrally provided with a connection cylindrical portion 31 A connected to the gas return path 23 , a cylindrical main body portion 31 B forming an accommodation portion for the valve body 32 and an annular collar portion 31 C including, for example, a hexagonal configuration and a different diameter.
- a male screw portion 31 D is formed at an outer circumferential portion of the cylindrical main body portion 31 B.
- the valve main body 31 , the valve body 32 , the support member 33 and the spring 34 are assumed to be formed by resin material, however, all of them or part of them can be formed by metal material.
- the cylindrical main body portion 31 B corresponds to a valve case portion which is inserted, from outside the upper part case portion 41 , through the valve mounting through hole 41 A and the cylindrical main body portion 31 B is inserted through the through hole 41 A in a state where an insertion depth is restricted by a contact of the annular collar portion 31 C and the upper part case portion 41 with each other.
- a metal fixture 25 threadedly engages, from inside the upper part case portion 41 , with the male screw portion 31 D of the cylindrical main body portion 31 B inserted through the through hole 41 A, and the PCV valve 30 is fixed to the upper part case portion 41 .
- the metal fixture 25 is provided with a cylindrical screw portion 26 formed with a female screw portion 26 A which threadedly engages with the male screw portion 31 D of the cylindrical main body portion 31 B.
- the metal fixture 25 is insert molded in the upper part case portion 41 in such a manner that the metal fixture 25 is prevented from turning and in such a manner that part of the cylindrical screw portion 26 is exposed to the gas space portion S, and the whole of the metal fixture 25 is made of metal having a high coefficient of thermal conductivity, including aluminum alloy and/or copper alloy, for example.
- the part of the cylindrical screw portion 26 is exposed to the gas space portion S, and thus the metal fixture 25 is configured to be heated with heat possessed by hot temperature atmosphere including the blow-by gas of the gas space portion S.
- the metal fixture 25 is applicable to any PCV valve 30 or to any cylindrical main body portion (the valve case portion) 31 B, and can be used as a common part. Therefore, the PCV valve 30 itself can be manufactured inexpensively without using the metal. In addition, the use of the common metal fixture 25 reduces a manufacturing unit price and makes an inventory control easy, thereby even more increasing efficiency of the mounting structure of the PCV valve 30 .
- the valve main body 31 is fixed to the upper part case portion 41 in a state where the annular collar portion 31 C and the cylindrical screw portion 26 sandwich a vicinity around the through hole 41 A of the upper part case portion 41 . Accordingly, a portion 41 B of the upper part case portion 41 , the portion 41 B being sandwiched by the annular collar portion 31 C and the cylindrical screw portion 26 , functions as an annular seal material sealing a gap between the cylindrical main body portion 31 B and the through hole 41 A.
- FIG. 3 illustrates a second embodiment of the present invention.
- the metal fixture 25 is integrally provided with the cylindrical screw portion 26 that is insert molded in the upper part case portion 41 in a manner that the part of the cylindrical screw portion 26 is exposed to the gas space portion S, and the metal fixture 25 is integrally provided with a heat receiving portion 27 including a plate shape and extended from the cylindrical screw portion 26 to protrude downwardly along a cylinder radial direction into the gas space portion S.
- the heat receiving portion 27 is ideally formed in such a configuration that does not easily hinder the flow of the blow-by gas in the gas space portion S.
- the heat receiving portion 27 may be provided as a flow passage forming member that forms a flow passage of the blow-by gas in the gas space portion S.
- the other configuration is similar to the first embodiment.
- the PCV valve mounting structure of the present invention is applicable to various internal combustion engines provided with a PCV valve.
Abstract
A PCV valve mounting structure which releases freezing of a PCV valve promptly is provided. A PCV valve mounting structure is provided with a resin cover forming an internal space portion between the resin cover and a cylinder head of an internal combustion engine, a valve mounting through hole formed at the resin cover, a PCV valve including a valve case portion inserted through the valve mounting through hole from outside the resin cover, and a metal fixture threadedly engaged, from inside the resin cover, with the valve case portion inserted through the valve mounting through hole, at least part of the metal fixture being exposed to the internal space portion.
Description
- The present invention relates to a PCV valve mounting structure including a cover forming an internal space portion between the cover and a cylinder head of an internal combustion engine, a valve mounting through hole formed at the cover and a PCV valve (positive crankcase ventilation valve) including a valve case portion inserted through the through hole from outside the cover.
- In recirculating a blow-by gas to an induction system, a PCV valve is provided to adjust flow amount of the recirculation. The blow-by gas corresponds to gas leaking out from a combustion chamber to an inside of a crankcase in compression/combustion processes of an internal combustion engine, for example. However, because the PCV valve is provided at an outside of a cylinder head and the PCV valve itself is exposed to outside air, moisture included in the blow-by gas attaches to the PCV valve and freezes especially in cold weather, and accordingly the PCV valve may be prevented from operating normally.
- Therefore, for example, the PCV valve is mounted on a cover forming an internal space portion between the cover and the cylinder head so that the frozen moisture can be defrosted with heat generated at the internal combustion engine. In a case where the cover is formed by metal having a high coefficient of thermal conductivity, including, for example, aluminum alloy, the heat generated at the internal combustion engine is efficiently transmitted to the PCV valve via the cover made of the metal, and accordingly the frozen moisture can be defrosted promptly. However, in a case where the cover is formed by resin having a lower coefficient of thermal conductivity compared to the metal, efficiency of defrosting the frozen moisture is decreased.
- In Patent document 1, a PCV valve mounting structure is described which allows heat generated at an internal combustion engine to be efficiently transmitted to the PCV valve mounted on a resin cover. According to the mounting structure, a portion of the PCV valve, the portion which is exposed to an internal space portion between a cylinder head and the resin cover, is formed by metal whose coefficient of thermal conductivity is high. It is configured in such a manner that efficiency of heat transfer to the PCV valve is enhanced and the frozen moisture is defrosted by heating the metal portion with heat possessed by hot temperature atmosphere of the internal space portion.
- Patent document 1: JP2009-150289A
- However, manufacturing cost of the PCV valve formed with the metal portion exposed to the internal space portion between the cylinder head and the resin cover is higher compared to a PCV valve which does not include such metal portion and whole of which is made of resin, for example. Because the PCV valve is designed depending on a type of an internal combustion engine, also such metal portion needs to be designed for each PCV valve. Accordingly, in providing the PCV valve, inconvenience occurs in aspects of a manufacturing efficiency and costs.
- The present invention is made in view of the above-described circumstances, and an object is to provide a PCV valve mounting structure which efficiently transmits heat generated at an internal combustion engine and releases freezing promptly even in a case where the PCV valve is made of resin.
- An aspect of a PCV valve mounting structure of the present invention is that the PCV valve mounting structure includes a resin cover forming an internal space portion between the resin cover and a cylinder head of an internal combustion engine, a valve mounting through hole formed at the resin cover, a PCV valve including a valve case portion inserted through the valve mounting through hole from outside the resin cover, and a metal fixture threadedly engaged, from inside the resin cover, with the valve case portion inserted through the valve mounting through hole, at least part of the metal fixture being exposed to the internal space portion.
- According to the PCV valve mounting structure including the present configuration, at least part of the metal fixture threadedly engaged with the valve case portion inserted through the through hole is exposed to the internal space portion, and the metal fixture can be heated with heat possessed by hot temperature atmosphere of the internal space portion.
- The foregoing metal fixture is applicable to any PCV valve or to any valve case portion, and can be used as a common part. Therefore, the PCV valve itself can be manufactured inexpensively without using metal. In addition, the use of the common metal fixture reduces a manufacturing unit price and makes an inventory control easy, thereby even more increasing efficiency of the PCV valve mounting structure.
- An aspect of the PCV valve mounting structure of the present invention is that the metal fixture is integrally provided with a cylindrical screw portion which is insert molded in the resin cover and a heat receiving portion extended from the cylindrical screw portion to protrude into the internal space portion, and the valve case portion is provided with a screw portion threadedly engaging with the cylindrical screw portion.
- According to the present configuration, by an operation of threadedly engaging the screw portion, which is provided at the valve case portion, with the cylindrical screw portion, which is insert molded in the resin cover, the PCV valve can be mounted on the resin cover conveniently. In addition, the heat receiving portion protruding into the internal space portion is provided to extend from the cylindrical screw portion, and thus a large area for receiving the heat can be assured. Consequently, the heat possessed by the hot temperature atmosphere of the internal space portion is received at the large area for receiving the heat, and accordingly the cylindrical screw portion can be heated. As a result, according to the PCV valve mounting structure including the present configuration, a freeze protection effect can be even more enhanced.
-
FIG. 1 Cross-sectional view of an internal combustion engine provided with a PCV valve -
FIG. 2 Cross-sectional view illustrating a PCV valve mounting structure -
FIG. 3 Cross-sectional view illustrating a PCV valve mounting structure of a second embodiment - Embodiments of the present invention will be described hereunder on the basis of the drawings.
-
FIG. 1 andFIG. 2 illustrate an engine (an internal combustion engine) E provided with a PCV valve mounting structure of the present embodiment. As illustrated inFIG. 1 , the engine E includes a cylinder head 1, acylinder block 2, acrankcase 3 and anoil pan 4 which are placed up and down to be arranged one above another, and are connected to one another. Acylinder head cover 5 is provided at an upper portion of the cylinder head 1. Thecylinder head cover 5 is made of resin including nylon, for example. - A
crankshaft 6 is rotatably supported inside thecrankcase 3 and pistons 7 are slidably fitted into plural cylinder bores formed at thecylinder block 2. The pistons 7 and thecrankshaft 6 are connected to each other with connectingrods 8. - An
air intake valve 9 and anexhaust valve 10 are provided at the cylinder head 1 to be able to open and close. Anintake cam shaft 11 and anexhaust cam shaft 12, which are in postures that are parallel to thecrankshaft 6, are rotatably supported at upper positions of theair intake valve 9 and theair exhaust valve 10. - An
intake manifold 14 is connected to one lateral surface of the cylinder head 1, anexhaust manifold 15 is connected to the other lateral surface of the cylinder head 1. Aspark plug 16 igniting air-fuel mixture of acombustion chamber 20 is provided at an upper surface of the cylinder head 1. - An
injector 17 supplying fuel to thecombustion chamber 20 is provided at an air intake passage provided at the cylinder head 1 and theintake manifold 14 is connected to the air intake passage. Asurge tank 18 is provided at an upstream-side relative to theintake manifold 14 and athrottle valve 19 is further provided at an upstream-side relative to thesurge tank 18. - Though not shown, an endless chain is wrapped along a crankshaft sprocket provided at a shaft end of the
crankshaft 6 and cam sprockets provided at shaft ends of the respectiveintake cam shaft 11 andexhaust cam shaft 12 so that theintake cam shaft 11 and theexhaust cam shaft 12 are rotated synchronously with rotations of thecrankshaft 6. Thespark plug 16 and theinjector 17 are provided to be controlled by a control apparatus (not shown) including ECU, for example. - Due to the foregoing configuration, when the engine E is operating, the
intake cam shaft 11 and theexhaust cam shaft 12 rotate synchronously with the rotations of thecrankshaft 6, thereby opening an intake port of theair intake valve 9 due to a compressive force from a cam portion of an outer circumference of theintake cam shaft 11 at a predetermined timing. Similarly, an exhaust port of theexhaust valve 10 is opened due to a compressive force from a cam portion of an outer circumference of theexhaust cam shaft 12 at a predetermined timing. - The control apparatus conducts control so that the
injector 17 supplies the fuel to thecombustion chamber 20 at the predetermined timing at which theintake valve 9 opens and that thespark plug 16 ignites the air-fuel mixture at a predetermined timing at which the air-fuel mixture of thecombustion chamber 20 is compressed. - Inside the
cylinder head cover 5,feed oil pipes 21 are arranged above the respectiveintake cam shaft 11 andexhaust cam shaft 12 to be in postures parallel to thecam shafts Spray nozzles 21A spraying oil downwardly are provided at thefeed oil pipes 21. - Thus, when the engine E is operating, the oil supplied by a hydraulic pump (not shown) to each of the
feed oil pipes 21 is sprayed from thespray nozzles 21A to theintake cam shaft 11 and theexhaust cam shaft 12. Though not shown, a discharge port discharging the oil is formed at the cylinder head 1 and an oil passage returning the oil, which is discharged from the discharge port, to theoil pan 4 is formed at the cylinder head 1. - When the engine E is operating, part of mixed gas introduced to the
combustion chamber 20 leaks out to acrank chamber 13 from a gap between an outer circumference of the piston 7 and an inner circumference of the corresponding cylinder. The unburnt mixed gas that has leaked in this way is referred to as the blow-by gas. The engine E is provided with a blow-by gas recirculation apparatus recirculating the blow-by gas to the induction system of the engine E and introducing the blow-by gas, together with new mixed gas, to thecombustion chamber 20 so that the introduced gas is burnt thereat. - The blow-by gas recirculation apparatus supplies the blow-by gas occurring in the
crank chamber 13 to anoil separator 40 provided at an upper portion of thecylinder head cover 5 via agas extract path 22. The blow-by gas recirculation apparatus transports the blow-by gas, from which oil mist is separated, to a gas space portion S and stores the blow-by gas thereat. The blow-by gas stored at the gas space portion S is sent to agas return path 23 via aPCV valve 30, and is returned to the induction system (specifically, the surge tank 18) of the engine E to be combusted in thecombustion chamber 20 together with the air-fuel mixture. - As illustrated in
FIG. 2 , theoil separator 40 is fixed at an upper surface of thecylinder head cover 5 while sandwiching agasket 24, and theoil separator 40 includes inside thereof a cyclone-type separation unit 43 separating and removing the oil mist included in the blow-by gas. - The
oil separator 40 is integrally provided with an upperpart case portion 41 and a lowerpart case portion 42, and the gas space portion (an internal space portion) S is formed at an inside of the upperpart case portion 41 and theseparation unit 43 is provided at an inside of the lowerpart case portion 42. A dividingwall 44 is formed at an intermediate portion between the upperpart case portion 41 and the lowerpart case portion 42, and a supply space portion T is formed at an outer circumference-side of theseparation unit 43 at a lower side relative to the dividingwall 44. As well as thecylinder head cover 5, each of the upperpart case portion 41, the lowerpart case portion 42, theseparation unit 43 and the dividingwall 44 is formed by resin material including nylon, for example. - The
separation unit 43 includes acylindrical portion 43A and a funnel-shapedportion 43B integrally formed at a lower side of thecylindrical portion 43A. Theseparation unit 43 is provided with anopening portion 43H formed at an outer circumference of thecylindrical portion 43A to be in communication with the supply space portion T. Theseparation unit 43 is provided with ahole portion 43C formed at a lower end of the funnel-shapedportion 43B to be in communication with an inside of thecylinder head cover 5. A throughhole 44A is formed at the dividingwall 44 that is at an upper position of thecylindrical portion 43A of theseparation unit 43. - Due to the foregoing configuration, in a case where the blow-by gas is supplied to the supply space portion T, the gas including therein the oil mist is introduced from the
opening portion 43H to an inside of thecylindrical portion 43A of theseparation unit 43 in a tangential direction, and accordingly the gas swirls as the gas is introduced thereto. The oil mist is gathered, collected and separated by an effect of centrifugal force due to the swirling of the gas. The gathered and collected oil mist is sent from an inner surface of the funnel-shapedportion 43B to thehole portion 43C, and then is sent out to the inside of thecylinder head cover 5 via thehole portion 43C. In addition, the blow-by gas from which the oil mist has been removed is led from the throughhole 44A of the dividingwall 44 to the gas space portion S. - The
PCV valve 30 is mounted on the upperpart case portion 41 in a state where thePCV valve 30 is in communication with the gas space portion (the internal space portion) S of the upperpart case portion 41. Thus, the upperpart case portion 41 serves as a resin cover which forms, together with thecylinder head cover 5, the internal space portion (the gas space portion S) between the upperpart case portion 41 and the cylinder head 1 of the engine E, and a valve mounting throughhole 41A is formed at the upperpart case portion 41 to be transversely arranged. - The
PCV valve 30 is provided with a valvemain body 31, avalve body 32 accommodated inside the valvemain body 31, asupport member 33 preventing thevalve body 32 from falling off the valvemain body 31 and aspring 34 biasing thevalve body 32 in a close direction. Ahole portion 33A is formed at thesupport member 33. - The valve
main body 31 is integrally provided with a connectioncylindrical portion 31A connected to thegas return path 23, a cylindricalmain body portion 31B forming an accommodation portion for thevalve body 32 and anannular collar portion 31C including, for example, a hexagonal configuration and a different diameter. Amale screw portion 31D is formed at an outer circumferential portion of the cylindricalmain body portion 31B. The valvemain body 31, thevalve body 32, thesupport member 33 and thespring 34 are assumed to be formed by resin material, however, all of them or part of them can be formed by metal material. - The cylindrical
main body portion 31B corresponds to a valve case portion which is inserted, from outside the upperpart case portion 41, through the valve mounting throughhole 41A and the cylindricalmain body portion 31B is inserted through the throughhole 41A in a state where an insertion depth is restricted by a contact of theannular collar portion 31C and the upperpart case portion 41 with each other. Ametal fixture 25 threadedly engages, from inside the upperpart case portion 41, with themale screw portion 31D of the cylindricalmain body portion 31B inserted through the throughhole 41A, and thePCV valve 30 is fixed to the upperpart case portion 41. - The
metal fixture 25 is provided with acylindrical screw portion 26 formed with afemale screw portion 26A which threadedly engages with themale screw portion 31D of the cylindricalmain body portion 31B. Themetal fixture 25 is insert molded in the upperpart case portion 41 in such a manner that themetal fixture 25 is prevented from turning and in such a manner that part of thecylindrical screw portion 26 is exposed to the gas space portion S, and the whole of themetal fixture 25 is made of metal having a high coefficient of thermal conductivity, including aluminum alloy and/or copper alloy, for example. - The part of the
cylindrical screw portion 26, the part including a portion which is not embedded in the upperpart case portion 41 and including a female screw portion with which themale screw portion 31D does not engage, is exposed to the gas space portion S, and thus themetal fixture 25 is configured to be heated with heat possessed by hot temperature atmosphere including the blow-by gas of the gas space portion S. - The
metal fixture 25 is applicable to anyPCV valve 30 or to any cylindrical main body portion (the valve case portion) 31B, and can be used as a common part. Therefore, thePCV valve 30 itself can be manufactured inexpensively without using the metal. In addition, the use of thecommon metal fixture 25 reduces a manufacturing unit price and makes an inventory control easy, thereby even more increasing efficiency of the mounting structure of thePCV valve 30. - The valve
main body 31 is fixed to the upperpart case portion 41 in a state where theannular collar portion 31C and thecylindrical screw portion 26 sandwich a vicinity around the throughhole 41A of the upperpart case portion 41. Accordingly, aportion 41B of the upperpart case portion 41, theportion 41B being sandwiched by theannular collar portion 31C and thecylindrical screw portion 26, functions as an annular seal material sealing a gap between the cylindricalmain body portion 31B and the throughhole 41A. -
FIG. 3 illustrates a second embodiment of the present invention. In the present embodiment, themetal fixture 25 is integrally provided with thecylindrical screw portion 26 that is insert molded in the upperpart case portion 41 in a manner that the part of thecylindrical screw portion 26 is exposed to the gas space portion S, and themetal fixture 25 is integrally provided with aheat receiving portion 27 including a plate shape and extended from thecylindrical screw portion 26 to protrude downwardly along a cylinder radial direction into the gas space portion S. - The
heat receiving portion 27 is ideally formed in such a configuration that does not easily hinder the flow of the blow-by gas in the gas space portion S. In addition, theheat receiving portion 27 may be provided as a flow passage forming member that forms a flow passage of the blow-by gas in the gas space portion S. The other configuration is similar to the first embodiment. -
- 1. According to the PCV valve mounting structure of the present invention, the whole of the metal fixture, which threadedly engages with the valve case portion from inside the resin cover, can be exposed to the internal space portion of the resin cover.
- 2. According to the PCV valve mounting structure of the present invention, the valve case portion can be inserted through the valve mounting through hole, which is formed at the cylinder head cover made of resin, and at least part of the metal fixture, which is threadedly engaged with the valve case portion from inside the cylinder head cover, can be exposed to the internal space portion of the cylinder head cover.
- The PCV valve mounting structure of the present invention is applicable to various internal combustion engines provided with a PCV valve.
- 1 cylinder head
- 25 metal fixture
- 26 cylindrical screw portion
- 27 heat receiving portion
- 30 PCV valve
- 31B cylindrical main body portion (valve case portion)
- 31D screw portion
- 41 upper part case portion (resin cover)
- 41A valve mounting through hole
- E internal combustion engine
- S gas space portion (internal space portion)
Claims (2)
1. A PCV valve mounting structure, comprising:
a resin cover forming an internal space portion between the resin cover and a cylinder head of an internal combustion engine;
a valve mounting through hole formed at the resin cover;
a PCV valve including a valve case portion inserted through the valve mounting through hole from outside the resin cover; and
a metal fixture threadedly engaged, from inside the resin cover, with the valve case portion inserted through the valve mounting through hole, at least part of the metal fixture being exposed to the internal space portion.
2. The PCV valve mounting structure according to claim 1 , wherein
the metal fixture is integrally provided with a cylindrical screw portion which is insert molded in the resin cover and a heat receiving portion extended from the cylindrical screw portion to protrude into the internal space portion, and
the valve case portion is provided with a screw portion threadedly engaging with the cylindrical screw portion.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012256711A JP5983350B2 (en) | 2012-11-22 | 2012-11-22 | PCV valve mounting structure |
JP2012-256711 | 2012-11-22 | ||
PCT/JP2013/080428 WO2014080786A1 (en) | 2012-11-22 | 2013-11-11 | Positive crankcase ventilation valve mounting structure |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150292374A1 true US20150292374A1 (en) | 2015-10-15 |
Family
ID=50775969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/443,099 Abandoned US20150292374A1 (en) | 2012-11-22 | 2013-11-11 | Pcv valve mounting structure |
Country Status (5)
Country | Link |
---|---|
US (1) | US20150292374A1 (en) |
EP (1) | EP2924254A4 (en) |
JP (1) | JP5983350B2 (en) |
CN (1) | CN204663619U (en) |
WO (1) | WO2014080786A1 (en) |
Cited By (2)
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US20180171841A1 (en) * | 2015-09-08 | 2018-06-21 | Elringklinger Ag | Cylinder head cover and method for producing a cylinder head cover |
US20190316500A1 (en) * | 2018-04-17 | 2019-10-17 | Toyota Boshoku Kabushiki Kaisha | Pcv valve coupling structure |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6493060B2 (en) * | 2015-07-23 | 2019-04-03 | トヨタ紡織株式会社 | PCV valve |
CN108591495B (en) * | 2018-05-11 | 2020-06-23 | 浙江吉利控股集团有限公司 | Automobile engine PCV valve and combined valve core thereof |
JP7124604B2 (en) * | 2018-09-27 | 2022-08-24 | トヨタ自動車株式会社 | blow-by gas treatment equipment |
JP7028758B2 (en) * | 2018-12-20 | 2022-03-02 | 株式会社クボタ | Work vehicle |
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- 2013-11-11 CN CN201390000902.4U patent/CN204663619U/en not_active Expired - Fee Related
- 2013-11-11 WO PCT/JP2013/080428 patent/WO2014080786A1/en active Application Filing
- 2013-11-11 EP EP13857607.9A patent/EP2924254A4/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
JP5983350B2 (en) | 2016-08-31 |
WO2014080786A1 (en) | 2014-05-30 |
CN204663619U (en) | 2015-09-23 |
EP2924254A1 (en) | 2015-09-30 |
EP2924254A4 (en) | 2016-03-09 |
JP2014105580A (en) | 2014-06-09 |
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