EP1182343A2 - Arrangement of cylinder head cover for internal combustion engine - Google Patents
Arrangement of cylinder head cover for internal combustion engine Download PDFInfo
- Publication number
- EP1182343A2 EP1182343A2 EP01120268A EP01120268A EP1182343A2 EP 1182343 A2 EP1182343 A2 EP 1182343A2 EP 01120268 A EP01120268 A EP 01120268A EP 01120268 A EP01120268 A EP 01120268A EP 1182343 A2 EP1182343 A2 EP 1182343A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- separation chamber
- head cover
- cylinder head
- air cleaner
- blowby 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.)
- Granted
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Classifications
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
- F02M35/044—Special arrangements of cleaners in or with respect to the air intake system, e.g. in the intake plenum, in ducts or with respect to carburettors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/18—DOHC [Double overhead camshaft]
Definitions
- the present invention relates to the arrangement of a cylinder head cover fixed to the cylinder head of an internal combustion engine.
- the head cover for covering the top of the cylinder head is prepared as a separate component from the air cleaner .
- this arrangement leads to an increase in number of parts to be fabricated.
- the separate arrangement tends to make the entire engine system rather bulky and heavy.
- JP-A-9(1997)-112358 teaches a one-piece structure of a cylinder head cover and an air cleaner.
- the air cleaner formed integral with the head cover, is disposed on the top of the head cover.
- the reduction of the height of the head cover can be achieved simply by reducing the internal volumes of the separation chamber and the air cleaner.
- downsizing of the chamber and the cleaner may cause a lowering of gas/liquid separation efficiency in the separation chamber or deterioration of the noise-absorbing function for intake gases in the air cleaner.
- blowby gas extraction tube made of e.g. rubber for conducting blowby gases from the cylinder head cover to the throttle body, as disclosed in JP-A-1(1989)-290907.
- the extraction tube is connected, at one end, to the blowby gas extraction port of the head cover and, at the other end, to the blowby gas inlet port of the throttle body.
- blowby gas extraction tube needs to be prepared in addition to other necessary components. Also, due to the increased number of parts to be used, the fabrication procedure of the engine system may become time-consuming. What is worse, the conventional blowby gas extraction tube is often clogged by the freezing of liquid which has been separated from blowby gases.
- the present invention has been proposed under the circumstances described above. It is, therefore, an object of the present invention to provide a novel arrangement of a cylinder head cover which does not suffer the above problems.
- a cylinder head cover for covering the cylinder head of an internal combustion engine.
- the head cover includes a housing, an air cleaner integral with the housing, and a gas/liquid separation chamber for blowby gases.
- the separation chamber is also integral with the housing.
- the head cover is characterized in that the air cleaner and the separation chamber are horizontally disposed with each other, and that the separation chamber projects upward or in the height direction of the air cleaner.
- the head cover of the second aspect includes a housing, an air cleaner integral with the housing, and a gas/liquid separation chamber for blowby gases.
- the separation chamber is also integral with the housing.
- the head cover of the second aspect is characterized in that the air cleaner and the separation chamber are horizontally disposed with each other, that the separation chamber projects in the height direction of the air cleaner, that the air cleaner is connected to a throttle body above the separation chamber, and that the separation chamber is provided with a blowby gas extraction port which is directly connected to a blowby gas inlet port of the throttle body.
- the air cleaner may include a dust case, a clean case and a filtering element.
- the clean case may be detachably attached to the dust case from above.
- the filtering element may be disposed between the dust case and the clean case.
- the dust case may accommodate ignition coils for cylinders of the internal combustion engine.
- the ignition coils are protected by the dust case of the air cleaner, whereby no additional protecting means needs to be provided for the ignition coils. Further, advantageously the ignition coils are cooled down by the gas flow within the air cleaner.
- the separation chamber may be elongated along the row of the cylinders of the engine, thereby increasing the inner volume of the chamber.
- the cylinder head cover of the second aspect may further include a first contact surface in which the blowby gas extraction port has an opening.
- the first contact surface may be pressed against a second contact surface of the throttle body in which the blowby gas inlet port has an opening.
- the first contact surface may be held horizontally or substantially horizontally with the blowby gas extraction port directed upward.
- the second contact surface may be held horizontally or substantially horizontally with the blowby gas inlet port directed downward.
- Figs. 1 and 2 illustrate a cylinder head cover according to a first embodiment of the present invention.
- numeral 1 refers to a cylinder head of an internal combustion engine.
- the engine includes three cylinders A1, A2 and A3 arranged in a row.
- a cam mechanism responsible for actuating e.g. inlet or exhaust valves is accommodated in a valve system chamber 2 located at the top of the cylinder head 1.
- the cylinder head cover (generally indicated by numeral 3) is detachably fixed to the cylinder head 1 to close the valve system chamber 2.
- the cylinder head cover 3 includes a suitably profiled housing in which an air filtering element 4c and a gas/liquid separation chamber 5 for blowby gases are provided.
- the profiled housing includes a lower casing (dust case) 4a and an upper casing (clean case) 4b which is detachably attached to the lower casing 4a from above.
- the filtering element 4c is disposed between the lower and the upper casings 4a, 4b, thereby partitioning the space defined by the two casings 4a, 4b.
- the lower and the upper casings 4a, 4b and the above-mentioned filtering element 4c constitute an air cleaner 4.
- the lower casing 4a of the air cleaner 4 is disposed at substantially the same level with and adjacent to the separation chamber 5.
- the separation chamber 5 tapers upward (i.e., in the height direction of the air cleaner 4), with its apex located higher than the inner bottom surface of the lower casing 4a.
- the separation chamber 5, as shown in Fig. 2 is elongated along the row of the cylinders A1-A3 of the engine.
- the height of the air cleaner 4 is not additional to the height of the separation chamber 5.
- the overall height of the cylinder head cover 3 is made advantageously smaller, while the individual heights of the cleaner 4 and the chamber 5 can be made greater.
- the internal volumes of the cleaner 4 and the chamber 5 are made sufficiently large, which is advantageous to providing an excellent gas/lubricant separation function in the separation chamber 5 and an excellent noise-absorbing function in the air cleaner 4.
- the chamber 5 is elongated along the row of the three cylinders A1-A3 (see Fig. 2). This structure serves to ensure a sufficiently large internal volume of the chamber 5.
- an air inlet tube 6 is connected to the lower casing 4a for supply of the air.
- the lower casing 4a is internally provided with coil-disposing portions at which three ignition coils 7 are placed. As readily seen, each coil 7 is provided for the relevant one of the cylinders A1-A3 of the internal combustion engine.
- the upper casing 4b is connected to the inlet manifold 8 via a throttle body 9 and an inlet duct 10 with a bellows.
- the throttle body 9 is fixed, at one end, to the manifold 8 and, at the other end, is detachably fitted into the inlet duct 10.
- the inlet duct 10, made of an elastic material such as rubber, is connected to a blowby gas extraction port 11 extending from the separation chamber 5.
- the blowby gas extraction port 11 is detachably fitted into the inlet duct 10.
- blowby gas leaked into the valve system chamber 2 flows into the separation chamber 5, to be subjected to gas/lubricant separation. Then, the lubricant-removed gas is conducted through the blowby gas extraction port 11, to joint the main flow passing through the inlet duct 10.
- FIG. 3-5 illustrating the arrangement of a cylinder head cover according to a second embodiment of the present invention.
- the illustrated internal combustion engine includes a cylinder head 1 which is similar in arrangement to the counterpart shown in Figs. 1 and 2. On top of the cylinder head 1, there is provided a cylinder head cover 30 for enclosing a valve system chamber 2.
- the head cover 30 is made of a synthetic resin and is detachably fixed to the cylinder head 1.
- the cylinder head 1 is connected, at one side thereof, to an inlet manifold 80 provided with a surge tank 80a.
- the cylinder head cover 30 is formed integral with an air cleaner 40 and with a gas/liquid separation chamber 50 for blowby gases.
- the air cleaner 40 includes a lower casing (dust case) 40a which is disposed at substantially the same level with the separation chamber 50.
- the lower casing 40a and the separation chamber 50 are arranged adjacent to each other.
- the apex of the separation chamber 50 is located above the inner bottom surfaces of the lower casing 40a.
- the lower casing 40a is connected to an air inlet tube for taking in the air.
- Within the lower casing 40a there are provided a prescribed number of ignition coils 70 for the respective cylinders of the internal combustion engine.
- the air cleaner 40 further includes an upper casing (clean case) 40b and a filtering element 40c.
- the upper casing 40b made of a synthetic resin, is detachably connected to the lower casing 40a from above.
- the filtering element 40c is provided between the lower and the upper casings 40a, 40b.
- Numeral 90 refers to a throttle body which is provided with a throttle valve 90b.
- the throttle body 90 is formed with a gas inlet bore 90a in which the throttle valve 90b is accommodated.
- the throttle body 90 is located above the separation chamber 50 and is connected, at one end, to a side of the surge tank 80a by bolts 12 (see Figs. 3 and 5 ) .
- the throttle body 90 is detachably fitted into an air exit 40d formed in the upper casing 40b of the air cleaner 40.
- a sealing ring 13 made of an elastic material such as rubber.
- the head cover 30 includes a horizontal upper surface 14 contacting with the throttle body 90 above the separation chamber 50.
- the upper surface 14 is formed with a blowby gas extraction port 110 which is open upward.
- the throttle body 90 on the other hand, includes a horizontal bottom surface 15 contacting closely with the upper surface 14 of the head cover 30. Thus, the throttle body 90 is stably positioned on the head cover 30.
- the throttle body 90 is formed with a blowby gas inlet port 90c communicating, at its upper end, with the bore 90a.
- the inlet port 90c is open downward in the bottom surface 15, to communicate with the above-mentioned blowby gas extraction port 110.
- the throttle body 90 is bolted to both the cylinder head 1 and the head cover 30 in the following manner.
- the throttle body 90 includes a first fixing leg 90d and a second fixing leg 90.
- the first fixing leg 90d is formed with a bore allowing the insertion of the shank (but not the passage of the head) of a long bolt 16.
- the second fixing leg 90e is formed with another bore allowing the insertion of the shank (but not the passage of the head) of a short bolt 17.
- sealing ring 19 made of an elastic material such as rubber.
- the illustrated sealing ring 19 is embedded in the upper contact surface 14 of the head cover 30, though the same may be provided on the throttle body 90.
- the sealing ring 19 may be replaced by other kinds of gaskets.
- blowby gas inlet port 90c communicates directly with the blowby gas extraction port 110.
- the throttle body 90 is provided with conventionally known components such a bypass passage for idle control or an air valve.
- a heater is provided at the throttle body 90 for preventing the air valve or throttle valve from freezing.
- this heater is used for warming up the blowby gas inlet port 90c and also the blowby gas extraction port 110 which is held in direct contact with the inlet port 90c.
- the throttle body 90 is connected to both the metal cylinder head 1 and the resin head cover 30, though the present invention is not limited to this.
- the throttle body 90 may be connected only to the cylinder head 1.
- the throttle body 90 may be connected only to the head cover 30.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
- The present invention relates to the arrangement of a cylinder head cover fixed to the cylinder head of an internal combustion engine.
- In a conventional internal combustion engine, the head cover for covering the top of the cylinder head is prepared as a separate component from the air cleaner . Unfavorably, this arrangement leads to an increase in number of parts to be fabricated. Also, the separate arrangement tends to make the entire engine system rather bulky and heavy.
- As one possible way to address the above problems, JP-A-9(1997)-112358 teaches a one-piece structure of a cylinder head cover and an air cleaner. The air cleaner, formed integral with the head cover, is disposed on the top of the head cover.
- Though this one-piece structure is functional, it also suffers the following drawback. Specifically, in accordance with JP-A-9-112358, a gas/liquid(lubricant oil) separation chamber for blowby gas is provided inside of the cylinder head cover, and the above-mentioned air cleaner is disposed above this separation chamber. Due to this two-story structure including the separation chamber and the air cleaner, the height of the head cover as a whole may become unduly large.
- In such an adverse case, the reduction of the height of the head cover can be achieved simply by reducing the internal volumes of the separation chamber and the air cleaner. However, such downsizing of the chamber and the cleaner may cause a lowering of gas/liquid separation efficiency in the separation chamber or deterioration of the noise-absorbing function for intake gases in the air cleaner.
- Another problem of the conventional art is caused by the use of a blowby gas extraction tube (made of e.g. rubber) for conducting blowby gases from the cylinder head cover to the throttle body, as disclosed in JP-A-1(1989)-290907. The extraction tube is connected, at one end, to the blowby gas extraction port of the head cover and, at the other end, to the blowby gas inlet port of the throttle body.
- With such an arrangement, the blowby gas extraction tube needs to be prepared in addition to other necessary components. Also, due to the increased number of parts to be used, the fabrication procedure of the engine system may become time-consuming. What is worse, the conventional blowby gas extraction tube is often clogged by the freezing of liquid which has been separated from blowby gases.
- The present invention has been proposed under the circumstances described above. It is, therefore, an object of the present invention to provide a novel arrangement of a cylinder head cover which does not suffer the above problems.
- According to a first aspect of the present invention, there is provided a cylinder head cover for covering the cylinder head of an internal combustion engine. The head cover includes a housing, an air cleaner integral with the housing, and a gas/liquid separation chamber for blowby gases. The separation chamber is also integral with the housing. The head cover is characterized in that the air cleaner and the separation chamber are horizontally disposed with each other, and that the separation chamber projects upward or in the height direction of the air cleaner.
- According to a second aspect of the present invention, there is provided a cylinder head cover for covering the cylinder head of an internal combustion engine. Like the head cover of the first aspect, the head cover of the second aspect includes a housing, an air cleaner integral with the housing, and a gas/liquid separation chamber for blowby gases. The separation chamber is also integral with the housing. The head cover of the second aspect is characterized in that the air cleaner and the separation chamber are horizontally disposed with each other, that the separation chamber projects in the height direction of the air cleaner, that the air cleaner is connected to a throttle body above the separation chamber, and that the separation chamber is provided with a blowby gas extraction port which is directly connected to a blowby gas inlet port of the throttle body.
- Preferably, the air cleaner may include a dust case, a clean case and a filtering element. The clean case may be detachably attached to the dust case from above. The filtering element may be disposed between the dust case and the clean case. The dust case may accommodate ignition coils for cylinders of the internal combustion engine.
- With such an arrangement, the ignition coils are protected by the dust case of the air cleaner, whereby no additional protecting means needs to be provided for the ignition coils. Further, advantageously the ignition coils are cooled down by the gas flow within the air cleaner.
- Preferably, the separation chamber may be elongated along the row of the cylinders of the engine, thereby increasing the inner volume of the chamber.
- Preferably, the cylinder head cover of the second aspect may further include a first contact surface in which the blowby gas extraction port has an opening. The first contact surface may be pressed against a second contact surface of the throttle body in which the blowby gas inlet port has an opening.
- Preferably, the first contact surface may be held horizontally or substantially horizontally with the blowby gas extraction port directed upward. Likewise, the second contact surface may be held horizontally or substantially horizontally with the blowby gas inlet port directed downward.
- Other features and advantages of the present invention will become apparent from the detailed description given below with reference to the accompanying drawings.
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- Fig. 1 is a sectional view showing the basic structure of a cylinder head cover according to a first embodiment of the present invention;
- Fig. 2 is a sectional view taken along lines II-II in Fig. 1;
- Fig. 3 is a sectional view showing the basic structure of a cylinder head cover according to a second embodiment of the present invention;
- Fig. 4 is a sectional view taken along lines IV-IV in Fig. 3; and
- Fig. 5 is an exploded view showing the principal portions of the head cover of the second embodiment.
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- The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
- Figs. 1 and 2 illustrate a cylinder head cover according to a first embodiment of the present invention. In the figures,
numeral 1 refers to a cylinder head of an internal combustion engine. As seen from Fig. 2, the engine includes three cylinders A1, A2 and A3 arranged in a row. A cam mechanism responsible for actuating e.g. inlet or exhaust valves is accommodated in avalve system chamber 2 located at the top of thecylinder head 1. The cylinder head cover (generally indicated by numeral 3) is detachably fixed to thecylinder head 1 to close thevalve system chamber 2. - The
cylinder head cover 3 includes a suitably profiled housing in which an air filtering element 4c and a gas/liquid separation chamber 5 for blowby gases are provided. The profiled housing includes a lower casing (dust case) 4a and an upper casing (clean case) 4b which is detachably attached to thelower casing 4a from above. The filtering element 4c is disposed between the lower and theupper casings casings upper casings - As shown in Fig. 1, the
lower casing 4a of the air cleaner 4 is disposed at substantially the same level with and adjacent to theseparation chamber 5. In section, theseparation chamber 5 tapers upward (i.e., in the height direction of the air cleaner 4), with its apex located higher than the inner bottom surface of thelower casing 4a. Theseparation chamber 5, as shown in Fig. 2, is elongated along the row of the cylinders A1-A3 of the engine. - With the above arrangements, the height of the air cleaner 4 is not additional to the height of the
separation chamber 5. Thus, as compared to the prior art structure, the overall height of thecylinder head cover 3 is made advantageously smaller, while the individual heights of the cleaner 4 and thechamber 5 can be made greater. Accordingly, the internal volumes of the cleaner 4 and thechamber 5 are made sufficiently large, which is advantageous to providing an excellent gas/lubricant separation function in theseparation chamber 5 and an excellent noise-absorbing function in the air cleaner 4. As stated above, thechamber 5 is elongated along the row of the three cylinders A1-A3 (see Fig. 2). This structure serves to ensure a sufficiently large internal volume of thechamber 5. - As shown in Fig. 2, an
air inlet tube 6 is connected to thelower casing 4a for supply of the air. Thelower casing 4a is internally provided with coil-disposing portions at which three ignition coils 7 are placed. As readily seen, each coil 7 is provided for the relevant one of the cylinders A1-A3 of the internal combustion engine. - The
upper casing 4b is connected to the inlet manifold 8 via athrottle body 9 and aninlet duct 10 with a bellows. Thethrottle body 9 is fixed, at one end, to the manifold 8 and, at the other end, is detachably fitted into theinlet duct 10. Theinlet duct 10, made of an elastic material such as rubber, is connected to a blowbygas extraction port 11 extending from theseparation chamber 5. The blowbygas extraction port 11 is detachably fitted into theinlet duct 10. - With the above structure, air is introduced into the
lower casing 4a of the air cleaner 4 via theinlet tube 6. In thecasing 4a, the air cools down the ignition coils 7. Then, the air enters theupper casing 4b through the filtering element 4c. Further, the cleaned air will be distributed into the respective cylinders A1-A3 of the engine via the manifold 8. - The blowby gas leaked into the
valve system chamber 2 flows into theseparation chamber 5, to be subjected to gas/lubricant separation. Then, the lubricant-removed gas is conducted through the blowbygas extraction port 11, to joint the main flow passing through theinlet duct 10. - Reference is now made to Figs. 3-5 illustrating the arrangement of a cylinder head cover according to a second embodiment of the present invention.
- The illustrated internal combustion engine includes a
cylinder head 1 which is similar in arrangement to the counterpart shown in Figs. 1 and 2. On top of thecylinder head 1, there is provided acylinder head cover 30 for enclosing avalve system chamber 2. Thehead cover 30 is made of a synthetic resin and is detachably fixed to thecylinder head 1. Thecylinder head 1 is connected, at one side thereof, to aninlet manifold 80 provided with asurge tank 80a. - The
cylinder head cover 30 is formed integral with anair cleaner 40 and with a gas/liquid separation chamber 50 for blowby gases. As in the first embodiment, theair cleaner 40 includes a lower casing (dust case) 40a which is disposed at substantially the same level with theseparation chamber 50. Thelower casing 40a and theseparation chamber 50 are arranged adjacent to each other. In Fig. 3, the apex of theseparation chamber 50 is located above the inner bottom surfaces of thelower casing 40a. Though not illustrated, thelower casing 40a is connected to an air inlet tube for taking in the air. Within thelower casing 40a, there are provided a prescribed number ofignition coils 70 for the respective cylinders of the internal combustion engine. - The
air cleaner 40 further includes an upper casing (clean case) 40b and afiltering element 40c. Theupper casing 40b, made of a synthetic resin, is detachably connected to thelower casing 40a from above. Thefiltering element 40c is provided between the lower and theupper casings -
Numeral 90 refers to a throttle body which is provided with athrottle valve 90b. Thethrottle body 90 is formed with a gas inlet bore 90a in which thethrottle valve 90b is accommodated. Thethrottle body 90 is located above theseparation chamber 50 and is connected, at one end, to a side of thesurge tank 80a by bolts 12 (see Figs. 3 and 5 ) . At the other end (inlet end), thethrottle body 90 is detachably fitted into anair exit 40d formed in theupper casing 40b of theair cleaner 40. For achieving hermetic connection between thethrottle body 90 and theair exit 40d, use is made of a sealingring 13 made of an elastic material such as rubber. - As best shown in Fig. 4, the
head cover 30 includes a horizontalupper surface 14 contacting with thethrottle body 90 above theseparation chamber 50. Theupper surface 14 is formed with a blowbygas extraction port 110 which is open upward. Thethrottle body 90, on the other hand, includes ahorizontal bottom surface 15 contacting closely with theupper surface 14 of thehead cover 30. Thus, thethrottle body 90 is stably positioned on thehead cover 30. - Further, the
throttle body 90 is formed with a blowbygas inlet port 90c communicating, at its upper end, with thebore 90a. Theinlet port 90c is open downward in thebottom surface 15, to communicate with the above-mentioned blowbygas extraction port 110. - The
throttle body 90 is bolted to both thecylinder head 1 and thehead cover 30 in the following manner. - As shown in Fig. 4, the
throttle body 90 includes afirst fixing leg 90d and asecond fixing leg 90. Thefirst fixing leg 90d is formed with a bore allowing the insertion of the shank (but not the passage of the head) of along bolt 16. Likewise, thesecond fixing leg 90e is formed with another bore allowing the insertion of the shank (but not the passage of the head) of ashort bolt 17. With their axes held vertically, thelong bolt 16 is connected to thecylinder head 1, while theshort bolt 17 is connected to thehead cover 30. Thus, thethrottle body 90 is stably fixed to thecylinder head 1 and also to thehead cover 30. As illustrated, use is made of aspacer 18 for thelong bolt 16 to maintain the prescribed distance between thefirst fixing leg 90d and thecylinder head 1. - For achieving hermetic connection between these two ports, use is made of a sealing
ring 19 made of an elastic material such as rubber. The illustratedsealing ring 19 is embedded in theupper contact surface 14 of thehead cover 30, though the same may be provided on thethrottle body 90. The sealingring 19 may be replaced by other kinds of gaskets. - In the assembled state, the blowby
gas inlet port 90c communicates directly with the blowbygas extraction port 110. Thus, there is no need to use an additional blowby gas extraction tube as disclosed in JP-A-1(1989)-290907. Accordingly, the length of the gas passage from theseparation chamber 50 to theinlet bore 90a is shortened, which is advantageous to making the blowby gas flow smoothly. - Though not shown in the figures, the
throttle body 90 is provided with conventionally known components such a bypass passage for idle control or an air valve. In addition, a heater is provided at thethrottle body 90 for preventing the air valve or throttle valve from freezing. Advantageously, this heater is used for warming up the blowbygas inlet port 90c and also the blowbygas extraction port 110 which is held in direct contact with theinlet port 90c. - In the above described embodiment, the
throttle body 90 is connected to both themetal cylinder head 1 and theresin head cover 30, though the present invention is not limited to this. For instance, thethrottle body 90 may be connected only to thecylinder head 1. When thehead cover 30 is made of metal, thethrottle body 90 may be connected only to thehead cover 30.
Claims (6)
- A cylinder head cover (3; 30) for covering a cylinder head (1) of an internal combustion engine, the head cover (3; 30) comprising:a housing (4a, 4b; 40a, 40b);an air cleaner (4; 40) integral with the housing (4a, 4b; 40a, 40b); anda gas/liquid separation chamber (5; 50) for blowby gas, the separation chamber (5; 50) being integral with the housing (4a, 4b; 40a, 40b); characterized inthat the air cleaner (4; 40) and the separation chamber (5; 50) are horizontally disposed with each other; andthat the separation chamber (5; 50) projects in the height direction of the air cleaner (4; 40).
- A cylinder head cover (30) for covering a cylinder head (1) of an internal combustion engine, the head cover (30) comprising:a housing (40a, 40b);an air cleaner (40) integral with the housing (40a, 40b); anda gas/liquid separation chamber (50) for blowby gas, the separation chamber (50) being integral with the housing (40a, 40b); characterized inthat the air cleaner (40) and the separation chamber (50) are horizontally disposed with each other;that the separation chamber (50) projects in the height direction of the air cleaner (40);that the air cleaner (40) is connected to a throttle body (90) above the separation chamber (50); andthat the separation chamber (50) is provided with a blowby gas extraction port (110) which is directly connected to a blowby gas inlet port (90c) of the throttle body (90).
- The cylinder head cover (3; 30) according to claim 1 or 2, wherein the air cleaner (4; 40) includes a dust case (4a; 40a), a clean case (4b; 40b) and a filtering element (4c; 40c), the clean case (4b; 40b) being detachably attached to the dust case (4a; 40a) from above, the filtering element (4c; 40c) being disposed between the dust case (4a; 40a) and the clean case (4b; 40b), the dust case (4b; 40b) accommodating ignition coils (7; 70) for cylinders (A1-A3) of the internal combustion engine.
- The cylinder head cover (3; 30) according to claim 1 or 2, wherein the separation chamber (5; 50) is elongated along the row of the cylinders (A1-A3).
- The cylinder head cover (30) according to claim 2, further comprising a first contact surface (14) in which the blowby gas extraction port (110) has an opening, the first contact surface (14) being pressed against a second contact surface (15) of the throttle body (90) in which the blowby gas inlet port (90c) has an opening.
- The cylinder head cover (30) according to claim 5, wherein the first contact surface (14) is held horizontally or substantially horizontally with the blowby gas extraction port (110) directed upward, the second contact surface (15) is held horizontally or substantially horizontally with the blowby gas inlet port (90c) directed downward.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000255679 | 2000-08-25 | ||
JP2000255679A JP3853582B2 (en) | 2000-08-25 | 2000-08-25 | Structure of cylinder head cover in internal combustion engine |
JP2000289343 | 2000-09-22 | ||
JP2000289343A JP2002097920A (en) | 2000-09-22 | 2000-09-22 | Blow-by gas extraction device for internal combustion engine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1182343A2 true EP1182343A2 (en) | 2002-02-27 |
EP1182343A3 EP1182343A3 (en) | 2003-04-02 |
EP1182343B1 EP1182343B1 (en) | 2006-09-27 |
Family
ID=26598480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010120268 Expired - Lifetime EP1182343B1 (en) | 2000-08-25 | 2001-08-23 | Arrangement of cylinder head cover for internal combustion engine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1182343B1 (en) |
DE (1) | DE60123350T2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004004753A1 (en) * | 2004-01-30 | 2005-08-18 | Mann + Hummel Gmbh | Cylinder head cover |
EP1752650A1 (en) * | 2004-06-01 | 2007-02-14 | Daihatsu Motor Co., Ltd. | Air intake device of internal combustion engine |
WO2008120234A1 (en) * | 2007-03-30 | 2008-10-09 | Tata Motors Limited | A novel integrated module for internal combustion inline common rail twin cylinder diesel engine |
EP2112361A1 (en) * | 2007-05-16 | 2009-10-28 | Honda Motor Co., Ltd. | Head cover for internal combustion engine |
WO2013056763A1 (en) * | 2011-10-18 | 2013-04-25 | Daimler Ag | Intake module for an internal combustion engine |
EP2589784A1 (en) * | 2011-11-02 | 2013-05-08 | Nissan Motor Manufacturing (UK) Ltd. | Motor vehicle engine with intergrated air filter unit |
EP3211189A1 (en) * | 2016-02-25 | 2017-08-30 | Toyota Boshoku Kabushiki Kaisha | Connection structure of blow-by gas hose |
JP2019199808A (en) * | 2018-05-14 | 2019-11-21 | 株式会社クボタ | Engine with blow-by gas recirculation device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01290907A (en) | 1988-05-16 | 1989-11-22 | Daihatsu Motor Co Ltd | Device for introducing blow-by gas of internal combustion engine |
JPH09112358A (en) | 1995-10-17 | 1997-04-28 | Mitsubishi Automob Eng Co Ltd | Cylinder head cover |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3730817A1 (en) * | 1987-09-14 | 1989-03-23 | Porsche Ag | CYLINDER HEAD COVER WITH SUCTION PIPE SYSTEM FOR AN INTERNAL COMBUSTION ENGINE |
FR2655383B1 (en) * | 1989-12-04 | 1994-05-13 | Peugeot Automobiles | CYLINDER COVER WITH INTEGRATED AIR FILTER. |
JPH0734985A (en) * | 1993-07-23 | 1995-02-03 | Kubota Corp | Evaporative fuel absorbing device for small general purpose engine |
US6095105A (en) * | 1999-03-01 | 2000-08-01 | Ford Global Technologies, Inc. | Plenum/runner module having integrated engine valve cover |
-
2001
- 2001-08-23 EP EP20010120268 patent/EP1182343B1/en not_active Expired - Lifetime
- 2001-08-23 DE DE2001623350 patent/DE60123350T2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01290907A (en) | 1988-05-16 | 1989-11-22 | Daihatsu Motor Co Ltd | Device for introducing blow-by gas of internal combustion engine |
JPH09112358A (en) | 1995-10-17 | 1997-04-28 | Mitsubishi Automob Eng Co Ltd | Cylinder head cover |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004004753A1 (en) * | 2004-01-30 | 2005-08-18 | Mann + Hummel Gmbh | Cylinder head cover |
EP1752650A4 (en) * | 2004-06-01 | 2010-09-01 | Daihatsu Motor Co Ltd | Air intake device of internal combustion engine |
EP1752650A1 (en) * | 2004-06-01 | 2007-02-14 | Daihatsu Motor Co., Ltd. | Air intake device of internal combustion engine |
US7392784B2 (en) | 2004-06-01 | 2008-07-01 | Toyota Jidosha Kabushiki Kaisha | Air intake device of internal combustion engine |
WO2008120234A1 (en) * | 2007-03-30 | 2008-10-09 | Tata Motors Limited | A novel integrated module for internal combustion inline common rail twin cylinder diesel engine |
EP2112361A4 (en) * | 2007-05-16 | 2010-04-07 | Honda Motor Co Ltd | Head cover for internal combustion engine |
EP2112361A1 (en) * | 2007-05-16 | 2009-10-28 | Honda Motor Co., Ltd. | Head cover for internal combustion engine |
CN101631946B (en) * | 2007-05-16 | 2011-06-22 | 本田技研工业株式会社 | Head cover for internal combustion engine |
WO2013056763A1 (en) * | 2011-10-18 | 2013-04-25 | Daimler Ag | Intake module for an internal combustion engine |
US9556835B2 (en) | 2011-10-18 | 2017-01-31 | Daimler Ag | Intake module for an internal combustion engine |
EP2589784A1 (en) * | 2011-11-02 | 2013-05-08 | Nissan Motor Manufacturing (UK) Ltd. | Motor vehicle engine with intergrated air filter unit |
EP3211189A1 (en) * | 2016-02-25 | 2017-08-30 | Toyota Boshoku Kabushiki Kaisha | Connection structure of blow-by gas hose |
JP2019199808A (en) * | 2018-05-14 | 2019-11-21 | 株式会社クボタ | Engine with blow-by gas recirculation device |
Also Published As
Publication number | Publication date |
---|---|
DE60123350T2 (en) | 2007-05-10 |
EP1182343B1 (en) | 2006-09-27 |
DE60123350D1 (en) | 2006-11-09 |
EP1182343A3 (en) | 2003-04-02 |
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