EP0455937A1 - Valve driving apparatus of an internal combustion engine - Google Patents
Valve driving apparatus of an internal combustion engine Download PDFInfo
- Publication number
- EP0455937A1 EP0455937A1 EP91101372A EP91101372A EP0455937A1 EP 0455937 A1 EP0455937 A1 EP 0455937A1 EP 91101372 A EP91101372 A EP 91101372A EP 91101372 A EP91101372 A EP 91101372A EP 0455937 A1 EP0455937 A1 EP 0455937A1
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- EP
- European Patent Office
- Prior art keywords
- intake
- exhaust valve
- hydraulic oil
- opening
- valve
- 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.)
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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
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
- F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
Definitions
- the present invention relates to a valve driving apparatus of an internal combustion engine of the type of opening and closing an intake and exhaust valve by means of an actuator.
- FIG. 2 One example of an accumulator valve driving apparatus in the prior art is shown in Fig. 2.
- reference numeral 01 designates a hydraulic pressure control valve main body having 5 ports.
- Numeral 02 designates a control valve, which is driven in synchronism of a crank shaft of an engine via a cam 03 and a roller 04.
- An intake and exhaust valve 07 is opened and closed on the inside of an actuator 06 mounted to a cylinder cover 05.
- the actuator 06 includes an upper hydraulic oil chamber 06a and a lower hydraulic oil chamber 06b, which are respectively connected to a control valve 01 via pipings 08 and 09.
- Reference numeral 010 designates a hydraulic pressure feeder composed of a filter and a pump, and numeral 010a designates a hydraulic oil tank.
- Reference numeral 011 designates an accumulator, which is maintained at a necessary constant hydraulic pressure and is communicated with the control valve 01 via a piping.
- FIG. 2 shows the state where the roller 04 is present on a basic circle of the cam 03 and the intake and exhaust valve is closed, and under this condition, hydraulic oil fed from the accumulator 011 flows from the control valve 01 through the piping 09, acts upon the lower hydraulic oil chamber 06b of the actuator 06, and pushes up the intake and exhaust valve 07. At this time, the hydraulic oil in the upper hydraulic oil chamber 06a is led back to the hydraulic oil tank 010a of the hydraulic pressure feeder or pressure source 010 through the piping 08 and the control valve 01.
- the control valve 01 has 5 ports and is complicated in structure, also it is necessary to make the amount of hydraulic oil necessitated for opening and closing the intake and exhaust valve flow also through the control valve 01, and hence the hydraulic pressure source is large-sized.
- control valve 01 is driven by the cam 03, and so, opening and closing timing of the intake and exhaust valve cannot be varied arbitrarily.
- a more specific object of the present invention is to provide a valve driving apparatus of an internal combustion engine, in which a control valve is simple in structure, a large-sized hydraulic pressure source is not necessitated, pipings of high-pressure hydraulic oil for opening and closing a valve as well as a structure of an actuator are simplified, consumption of high-pressure hydraulic oil is reduced, and opening and closing timing of an intake and exhaust valve can be arbitrarily varied.
- a valve driving apparatus of an internal combustion engine including a hydraulic pressure source and an accumulator for pressurizing operating hydraulic oil and accumulating the pressurized operating hydraulic oil, and adapted to drive an intake and exhaust valve by controlling the operating hydraulic oil in the accumulator
- which apparatus comprises two logic valves communicated with each other for opening and closing a high-pressure hydraulic oil path communicated with an upper side of an intake and exhaust valve driving piston, two electromagnetically driven control valves for controlling opening and closure of the two logic valves, the control hydraulic oil for opening and closing the logic valves and the operating hydraulic oil for driving the intake and exhaust valve to open being fed from the accumulator at a high pressure, and means for closing the intake and exhaust valve with a resilient force generated as a result of lift of the intake and exhaust valve driving piston upon opening of the intake and exhaust valve.
- the above-featured valve driving apparatus of an internal combustion engine wherein the means for closing the intake and exhaust valve with a resilient force, consists of an air cylinder, and an air piston adapted to slide within the air cylinder as driven by the intake and exhaust valve driving piston and to generate a pneumatic resilient force.
- a structure such that the operating hydraulic oil at a high pressure is used only for opening an intake and exhaust valve and closure of the valve is effected with a resilient force of accumulated in a resilient means as a result of lift of the intake and exhaust valve, is employed.
- control valves and two logic valves are provided, and provision is made such that the control valves may be electrically driven to only control the action of a hydraulic pressure applied from an accumulator to large-diameter portions of the logic valves, and hydraulic oil necessitated for opening the intake and exhaust valve may be made to act upon a piston of a hydraulic cylinder within a valve driving actuator from the accumulator via one logic valve and one high-pressure piping.
- the small-diameter sides of the two logic valves are communicated with each other, and upon closing the intake and exhaust valve, the other logic valve is opened so as to release the hydraulic pressure within the hydraulic cylinder and within the high-pressure piping.
- the operating hydraulic oil at a high pressure accumulated in the accumulator acts upon the piston within the valve driving actuator when an opening side logic valve is opened by an opening side control valve which can be electrically driven at an arbitrary timing, and after the piston has depressed the intake and exhaust valve, the closure side control valve returns to its original state and the opening side logic valve is closed.
- a compression force of air caused by an air piston moving jointly with the intake and exhaust valve acts as a biassing force in the direction of opening the valve, and as a result of balance between the pneumatic compression force and a force generated by the hydraulic pressure, an appropriate lift can be maintained.
- the closure side logic valve is opened by the closure side control valve, and since the hydraulic pressure is released, the intake and exhaust valve is closed by the pneumatic spring means.
- opening and closing characteristics of an intake and exhaust valve which are optimum for an engine can be obtained, and so, an internal combustion engine of low fuel consumption and excellent performance can be provided.
- a hydraulic pressure source can be designed small and it becomes less expensive.
- power consumption is also little, and hence a further low fuel consumption expense is resulted.
- a small amount of hydraulic oil can suffice in the control valve portion, hence a compact control valve is provided, and a valve driving apparatus having a high reliability and a good durability can be realized.
- reference numeral 1 designates a cylinder cover
- numeral 2 designates an intake and exhaust valve
- numeral 3 designates an air reservoir
- numeral 4 designates a check valve
- Reference numeral 5 designates an air piston, which slides within an air cylinder 6 jointly with the intake and exhaust valve 2.
- Reference numeral 7 designates a valve driving actuator main body
- numeral 8 designates a hydraulic cylinder
- numeral 9 designates an actuating piston
- numeral 8a designates an upper hydraulic oil chamber
- numeral 8b designates a lower hydraulic oil chamber.
- Reference numeral 10 designates a high-pressure piping
- numeral 11 designates an opening side logic valve
- numeral 12 designates an opening side logic valve oil path, which is connected to an accumulator 16.
- Reference numeral 13 designates an opening side spool control valve, which is driven by a controller not shown in synchronism with rotation of a crank of an engine.
- Reference numeral 14 designates a closure side logic valve
- numeral 15 designates a closure side spool control valve, which is driven by a controller not shown similarly to the opening side spool control valve 13, and which is a 3-port control valve.
- Reference numeral 16 designates an accumulator
- numeral 17 designates a hydraulic pressure source, which feeds high-pressure hydraulic oil and consists of a pump and a filter.
- Reference numeral 18 designates a low-pressure hydraulic pressure source, which communicates with the valve driving actuator 7 through a piping 18a.
- Reference numeral 19 designates an oil tank
- numeral 20 designates a communication oil path connecting the opening side logic valve 11 with the closure side logic valve 14
- numeral 21 designates an oil path connecting a large-diameter side of the opening side logic valve 11 with the opening side spool control valve 13
- numeral 22 designates an oil path connecting an opening side spool control valve 13 with the accumulator 16
- numeral 23 designates an oil path connecting a large-diameter side of the closure side logic valve 14 with the closure side spool control valve
- numeral 24 designates an oil path connecting the closure side spool control valve 15 with the accumulator 16.
- Reference numeral 25 designates an oil discharge piping extending from the closure side logic valve 14 to the oil tank 19
- numeral 26 designates an oil discharge piping extending from the spool control valves 13 and 15.
- These spool control valves are 3-port control valves having a P-port, a C-port and a T-port, and they are electromagnetically driven.
- Fig. 1 shows the state where an air pressure in the air reservoir 3 acts upon the lower side of the air piston 5 and the intake and exhaust valve 2 is kept closed.
- the opening side and closure side spool control valves 13 and 15 would make the hydraulic pressure fed from the accumulator 16 act upon the large-diameter sides of the opening and closure logic valves 11 and 14, and thereby the logic valves 11 and 14 are kept closed.
- the opening side spool control valve 13 is driven at an appropriate time determined by a computer in response to a trigger signal issue in synchronism with an engine not shown and on the basis of the operating condition of the engine.
- the oil path 22 is closed, the oil path 21 communicates with the oil discharge piping 26, and since the hydraulic pressure on the large-diameter side of the logic valve 11 is released, the logic valve 11 opens, and hence the hydraulic pressure in the accumulator 16 acts upon the upper hydraulic oil chamber 8a of the hydraulic cylinder 8 within the valve driving actuator 7 through the oil path 12 and the high-pressure piping 10.
- the hydraulic piston 9 is depressed by this hydraulic pressure, and thereby the intake and exhaust valve 2 is opened.
- the air within the air cylinder 6 is compressed and exerts an upward force upon the air piston 5, and the intake and exhaust valve 2 lifts up to the point where the upward force balances with a downward force generated by the hydraulic pressure.
- the opening side control valve 13 is returned to its original position, hence the hydraulic pressure in the accumulator 16 acts upon the large-diameter portion of the opening side logic valve 11, and the opening side logic valve 11 is closed.
- a valve driving apparatus of an internal combustion engine including a hydraulic pressure source and an accumulator for pressurizing operating hydraulic oil and accumulating the pressurized operating hydraulic oil and adapted to drive an intake and exhaust valve by controlling the operating hydraulic oil in the accumulator
- two logic valves communicated with each other for opening and closing a high-pressure hydraulic oil path communicated with an upper side of an intake and exhaust valve driving piston
- two electromagnetically driven control valves for controlling opening and closure of the two logic valves
- the control hydraulic oil for opening and closing the logic valves and the operating hydraulic oil for driving the intake and exhaust valve to open being fed from the accumulator at a high pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
- The present invention relates to a valve driving apparatus of an internal combustion engine of the type of opening and closing an intake and exhaust valve by means of an actuator.
- One example of an accumulator valve driving apparatus in the prior art is shown in Fig. 2. In the construction of the apparatus, reference numeral 01 designates a hydraulic pressure control valve main body having 5 ports. Numeral 02 designates a control valve, which is driven in synchronism of a crank shaft of an engine via a
cam 03 and aroller 04. An intake andexhaust valve 07 is opened and closed on the inside of anactuator 06 mounted to acylinder cover 05. Theactuator 06 includes an upper hydraulic oil chamber 06a and a lower hydraulic oil chamber 06b, which are respectively connected to a control valve 01 viapipings Reference numeral 010 designates a hydraulic pressure feeder composed of a filter and a pump, andnumeral 010a designates a hydraulic oil tank.Reference numeral 011 designates an accumulator, which is maintained at a necessary constant hydraulic pressure and is communicated with the control valve 01 via a piping. - Next, description will be made on operations. Fig. 2 shows the state where the
roller 04 is present on a basic circle of thecam 03 and the intake and exhaust valve is closed, and under this condition, hydraulic oil fed from theaccumulator 011 flows from the control valve 01 through thepiping 09, acts upon the lower hydraulic oil chamber 06b of theactuator 06, and pushes up the intake andexhaust valve 07. At this time, the hydraulic oil in the upper hydraulic oil chamber 06a is led back to thehydraulic oil tank 010a of the hydraulic pressure feeder orpressure source 010 through thepiping 08 and the control valve 01. - As the
cam 03 rotates, when theroller 04 has lifted, the hydraulic oil in the lower hydraulic pressure chamber 06b of theactuator 06 is discharged through thepiping 09 and the control valve 01 to the tank 01a, and simultaneously the high-pressure hydraulic oil in theaccumulator 011 is led through the control valve 01 and thepiping 08 to the upper hydraulic pressure chamber 06a of theactuator 06 and depresses the intake andexhaust valve 07 to open the valve. As thecam 03 rotates further, when the lift of the cam has been reduced up to the basic circle, the hydraulic oil in the upper hydraulic pressure chamber 06a is discharged to thetank 010a, then the hydraulic oil in theaccumulator 011 acts upon the lower hydraulic pressure chamber 06b, and the intake andexhaust valve 07 is raised up to close the same valve. - However, the above-described structure in the prior art involved the following problems.
- The control valve 01 has 5 ports and is complicated in structure, also it is necessary to make the amount of hydraulic oil necessitated for opening and closing the intake and exhaust valve flow also through the control valve 01, and hence the hydraulic pressure source is large-sized.
- In addition, two
pipings - Furthermore, the control valve 01 is driven by the
cam 03, and so, opening and closing timing of the intake and exhaust valve cannot be varied arbitrarily. - It is therefore one object of the present invention to provide an improved valve driving apparatus of an internal combustion engine, which is free from all the above-mentioned shortcomings of the valve driving apparatus in the prior art.
- A more specific object of the present invention is to provide a valve driving apparatus of an internal combustion engine, in which a control valve is simple in structure, a large-sized hydraulic pressure source is not necessitated, pipings of high-pressure hydraulic oil for opening and closing a valve as well as a structure of an actuator are simplified, consumption of high-pressure hydraulic oil is reduced, and opening and closing timing of an intake and exhaust valve can be arbitrarily varied.
- According to one feature of the present invention, there is provided a valve driving apparatus of an internal combustion engine including a hydraulic pressure source and an accumulator for pressurizing operating hydraulic oil and accumulating the pressurized operating hydraulic oil, and adapted to drive an intake and exhaust valve by controlling the operating hydraulic oil in the accumulator, which apparatus comprises two logic valves communicated with each other for opening and closing a high-pressure hydraulic oil path communicated with an upper side of an intake and exhaust valve driving piston, two electromagnetically driven control valves for controlling opening and closure of the two logic valves, the control hydraulic oil for opening and closing the logic valves and the operating hydraulic oil for driving the intake and exhaust valve to open being fed from the accumulator at a high pressure, and means for closing the intake and exhaust valve with a resilient force generated as a result of lift of the intake and exhaust valve driving piston upon opening of the intake and exhaust valve.
- According to another feature of the present invention, there is provided the above-featured valve driving apparatus of an internal combustion engine, wherein the means for closing the intake and exhaust valve with a resilient force, consists of an air cylinder, and an air piston adapted to slide within the air cylinder as driven by the intake and exhaust valve driving piston and to generate a pneumatic resilient force.
- More particularly, according to the novel features of the present invention, a structure such that the operating hydraulic oil at a high pressure is used only for opening an intake and exhaust valve and closure of the valve is effected with a resilient force of accumulated in a resilient means as a result of lift of the intake and exhaust valve, is employed.
- Furthermore, two control valves and two logic valves are provided, and provision is made such that the control valves may be electrically driven to only control the action of a hydraulic pressure applied from an accumulator to large-diameter portions of the logic valves, and hydraulic oil necessitated for opening the intake and exhaust valve may be made to act upon a piston of a hydraulic cylinder within a valve driving actuator from the accumulator via one logic valve and one high-pressure piping.
- In addition, the small-diameter sides of the two logic valves are communicated with each other, and upon closing the intake and exhaust valve, the other logic valve is opened so as to release the hydraulic pressure within the hydraulic cylinder and within the high-pressure piping.
- In operation, the operating hydraulic oil at a high pressure accumulated in the accumulator acts upon the piston within the valve driving actuator when an opening side logic valve is opened by an opening side control valve which can be electrically driven at an arbitrary timing, and after the piston has depressed the intake and exhaust valve, the closure side control valve returns to its original state and the opening side logic valve is closed. While the intake and exhaust valve continues to be opened by the hydraulic pressure, a compression force of air caused by an air piston moving jointly with the intake and exhaust valve acts as a biassing force in the direction of opening the valve, and as a result of balance between the pneumatic compression force and a force generated by the hydraulic pressure, an appropriate lift can be maintained. When intake or exhaust necessary for the engine has been carried out, the closure side logic valve is opened by the closure side control valve, and since the hydraulic pressure is released, the intake and exhaust valve is closed by the pneumatic spring means.
- The above-mentioned operation cycles are repeated.
- According to the present invention, owing to the above-described structural and operational features, opening and closing characteristics of an intake and exhaust valve which are optimum for an engine can be obtained, and so, an internal combustion engine of low fuel consumption and excellent performance can be provided. Moreover, as consumption of high-pressure hydraulic oil for driving a valve is also little, a hydraulic pressure source can be designed small and it becomes less expensive. In addition, power consumption is also little, and hence a further low fuel consumption expense is resulted. Also, a small amount of hydraulic oil can suffice in the control valve portion, hence a compact control valve is provided, and a valve driving apparatus having a high reliability and a good durability can be realized.
- The above-mentioned and other objects, features and advantages of the present invention will become more apparent by reference to the following description of one preferred embodiment of the invention taken in conjunction with the accompanying drawings.
- In the accompanying drawings:
- Fig. 1 is a system diagram of a valve driving apparatus according to one preferred embodiment of the present invention; and
- Fig. 2 is a system diagram of an accumulator type valve driving apparatus in the prior art.
- Now, one preferred embodiment of the present invention will be described with reference to Fig. 1. In this figure, reference numeral 1 designates a cylinder cover,
numeral 2 designates an intake and exhaust valve, numeral 3 designates an air reservoir, and numeral 4 designates a check valve.Reference numeral 5 designates an air piston, which slides within an air cylinder 6 jointly with the intake andexhaust valve 2.Reference numeral 7 designates a valve driving actuator main body,numeral 8 designates a hydraulic cylinder,numeral 9 designates an actuating piston, numeral 8a designates an upper hydraulic oil chamber, andnumeral 8b designates a lower hydraulic oil chamber. - Reference numeral 10 designates a high-pressure piping, numeral 11 designates an opening side logic valve, and
numeral 12 designates an opening side logic valve oil path, which is connected to anaccumulator 16.Reference numeral 13 designates an opening side spool control valve, which is driven by a controller not shown in synchronism with rotation of a crank of an engine. Reference numeral 14 designates a closure side logic valve,numeral 15 designates a closure side spool control valve, which is driven by a controller not shown similarly to the opening sidespool control valve 13, and which is a 3-port control valve.Reference numeral 16 designates an accumulator, andnumeral 17 designates a hydraulic pressure source, which feeds high-pressure hydraulic oil and consists of a pump and a filter.Reference numeral 18 designates a low-pressure hydraulic pressure source, which communicates with thevalve driving actuator 7 through a piping 18a.Reference numeral 19 designates an oil tank,numeral 20 designates a communication oil path connecting the opening side logic valve 11 with the closure side logic valve 14,numeral 21 designates an oil path connecting a large-diameter side of the opening side logic valve 11 with the opening sidespool control valve 13,numeral 22 designates an oil path connecting an opening sidespool control valve 13 with theaccumulator 16,numeral 23 designates an oil path connecting a large-diameter side of the closure side logic valve 14 with the closure sidespool control valve 15, andnumeral 24 designates an oil path connecting the closure sidespool control valve 15 with theaccumulator 16. -
Reference numeral 25 designates an oil discharge piping extending from the closure side logic valve 14 to theoil tank 19,numeral 26 designates an oil discharge piping extending from thespool control valves - These spool control valves are 3-port control valves having a P-port, a C-port and a T-port, and they are electromagnetically driven.
- Next, description will be made on operations of the illustrated apparatus.
- Fig. 1 shows the state where an air pressure in the air reservoir 3 acts upon the lower side of the
air piston 5 and the intake andexhaust valve 2 is kept closed. - At this time, the opening side and closure side
spool control valves accumulator 16 act upon the large-diameter sides of the opening and closure logic valves 11 and 14, and thereby the logic valves 11 and 14 are kept closed. - When the valve opening timing of the intake and
exhaust valve 2 has come, the opening sidespool control valve 13 is driven at an appropriate time determined by a computer in response to a trigger signal issue in synchronism with an engine not shown and on the basis of the operating condition of the engine. When thesame control valve 13 operates, theoil path 22 is closed, theoil path 21 communicates with theoil discharge piping 26, and since the hydraulic pressure on the large-diameter side of the logic valve 11 is released, the logic valve 11 opens, and hence the hydraulic pressure in theaccumulator 16 acts upon the upper hydraulic oil chamber 8a of thehydraulic cylinder 8 within thevalve driving actuator 7 through theoil path 12 and the high-pressure piping 10. Thehydraulic piston 9 is depressed by this hydraulic pressure, and thereby the intake andexhaust valve 2 is opened. - At this time, the air within the air cylinder 6 is compressed and exerts an upward force upon the
air piston 5, and the intake andexhaust valve 2 lifts up to the point where the upward force balances with a downward force generated by the hydraulic pressure. - Thereafter, the opening
side control valve 13 is returned to its original position, hence the hydraulic pressure in theaccumulator 16 acts upon the large-diameter portion of the opening side logic valve 11, and the opening side logic valve 11 is closed. - When the intake or exhaust necessary for the engine has been done, the closure side
spool control valve 15 is driven, theoil path 23 and theoil discharge piping 26 are communicated simultaneously with closure of theoil path 24, and since the hydraulic pressure on the large-diameter side of the logic valve 14 is released, the logic valve 14 is opened, hence the hydraulic pressure acting upon the upper hydraulic oil chamber 8a is released through the high-pressure piping 10 and thecommunication oil path 20 to theoil discharge piping 25, and the acting force of the hydraulic pressure disappears. Then, the intake andexhaust valve 2 is closed by the resilient force generated by compression of air and acting upon theair piston 5. At this time, hydraulic oil fed from the low-pressurehydraulic pressure source 18 is supplied to the lower hydraulic oil chamber 8a, and so, the actuatingpiston 9 returns to its raised position under a stable condition without producing a cavity. - It is to be noted that while a return device for the intake and exhaust valve by means of an air spring was employed in the above-described embodiment, a return device relying upon a conventional coil spring can be also utilized.
- As will be obvious from the detailed description of one preferred embodiment above, according to the present invention, owing to the fact that in a valve driving apparatus of an internal combustion engine including a hydraulic pressure source and an accumulator for pressurizing operating hydraulic oil and accumulating the pressurized operating hydraulic oil and adapted to drive an intake and exhaust valve by controlling the operating hydraulic oil in the accumulator, there are provided two logic valves communicated with each other for opening and closing a high-pressure hydraulic oil path communicated with an upper side of an intake and exhaust valve driving piston, two electromagnetically driven control valves for controlling opening and closure of the two logic valves, the control hydraulic oil for opening and closing the logic valves and the operating hydraulic oil for driving the intake and exhaust valve to open being fed from the accumulator at a high pressure, and means for closing the intake and exhaust valve with a resilient force generated as a result of lift of the intake and exhaust valve driving piston upon opening of the intake and exhaust valve, the following advantages are offered:
- (1) Since opening and closing characteristics of an intake and exhaust valve which are optimum for an engine can be obtained, an internal combustion engine of low fuel consumption and excellent performance can be provided.
- (2) Since consumption of high-pressure hydraulic oil for driving a valve is also little, a hydraulic pressure source can be designed small, and it becomes less expensive. In addition, power consumption is also little, and hence, a further low fuel consumption expense is resulted.
- (3) Since a small amount of hydraulic oil can suffice in the control valve portion, a compact control valve is provided, and a valve driving apparatus having a high reliability and a good durability can be realized.
- While a principle of the present invention has been described above in connection to one preferred embodiment of the invention, it is intended that all matter contained in the above description and illustrated in the accompanying drawings shall be interpreted to be illustrative and not as a limitation to the scope of the invention.
Claims (2)
- A valve driving apparatus of an internal combustion engine including a hydraulic pressure source and an accumulator for pressurizing operating hydraulic oil and accumulating the pressurized operating hydraulic oil, and adapted to drive an intake and exhaust valve by controlling the operating hydraulic oil in the accumulator; characterized in that said apparatus comprises two logic valves communicated with each other for opening and closing a high-pressure hydraulic oil path communicated with an upper side of an intake and exhaust valve driving piston, two electromagnetically driven control valves for controlling opening and closure of said two logic valves, the control hydraulic oil for opening and closing said logic valves and the operating hydraulic oil for driving said intake and exhaust valve to open being fed from said accumulator at a high pressure, and means for closing said intake and exhaust valve with a resilient force generated as a result of lift of said intake and exhaust valve driving piston upon opening of the intake and exhaust valve.
- A valve driving apparatus for an internal combustion engine as claimed in Claim 1, characterized in that said means for closing the intake and exhaust valve with a resilient force, consists of an air cylinder, and an air piston adapted to slide within said air cylinder as driven by said intake and exhaust valve driving piston and to generate a pneumatic resilient force.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP12007390 | 1990-05-11 | ||
JP120073/90 | 1990-05-11 |
Publications (2)
Publication Number | Publication Date |
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EP0455937A1 true EP0455937A1 (en) | 1991-11-13 |
EP0455937B1 EP0455937B1 (en) | 1994-08-10 |
Family
ID=14777233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91101372A Expired - Lifetime EP0455937B1 (en) | 1990-05-11 | 1991-02-01 | Valve driving apparatus of an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0455937B1 (en) |
JP (2) | JP2527268Y2 (en) |
KR (1) | KR940010284B1 (en) |
DE (2) | DE455937T1 (en) |
DK (1) | DK0455937T3 (en) |
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JP5781345B2 (en) * | 2011-03-24 | 2015-09-24 | 三菱重工業株式会社 | Hydraulic actuator system |
DK178787B1 (en) * | 2015-05-06 | 2017-02-06 | Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland | A large turbocharged two-stroke self-igniting internal combustion engine with an exhaust valve actuation system |
CN107100689B (en) * | 2017-06-28 | 2023-04-07 | 吉林大学 | Electromagnetic control hydraulic drive type fully-variable valve mechanism |
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FR1361178A (en) * | 1963-06-27 | 1964-05-15 | Mitsubishi Shipbuilding & Eng | Quick valve control device in an internal combustion engine |
GB2102065A (en) * | 1981-07-07 | 1983-01-26 | Sulzer Ag | An inlet or exhaust valve assembly for an internal combustion engine |
EP0391507A1 (en) * | 1989-04-03 | 1990-10-10 | Mitsubishi Jukogyo Kabushiki Kaisha | Valve system of internal combustion engine |
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1990
- 1990-08-31 JP JP1990090676U patent/JP2527268Y2/en not_active Expired - Fee Related
- 1990-09-28 JP JP2257125A patent/JP2809354B2/en not_active Expired - Lifetime
-
1991
- 1991-02-01 DK DK91101372.0T patent/DK0455937T3/en active
- 1991-02-01 DE DE199191101372T patent/DE455937T1/en active Pending
- 1991-02-01 DE DE69103323T patent/DE69103323T2/en not_active Expired - Lifetime
- 1991-02-01 EP EP91101372A patent/EP0455937B1/en not_active Expired - Lifetime
- 1991-05-10 KR KR1019910007516A patent/KR940010284B1/en not_active IP Right Cessation
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FR1361178A (en) * | 1963-06-27 | 1964-05-15 | Mitsubishi Shipbuilding & Eng | Quick valve control device in an internal combustion engine |
GB2102065A (en) * | 1981-07-07 | 1983-01-26 | Sulzer Ag | An inlet or exhaust valve assembly for an internal combustion engine |
EP0391507A1 (en) * | 1989-04-03 | 1990-10-10 | Mitsubishi Jukogyo Kabushiki Kaisha | Valve system of internal combustion engine |
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Title |
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US5586526A (en) * | 1993-06-04 | 1996-12-24 | Man B&W Diesel A/S | Large two-stroke internal combustion engine |
GB2291121A (en) * | 1994-06-27 | 1996-01-17 | Ford Motor Co | Engine hydraulic valve operating system |
GB2291121B (en) * | 1994-06-27 | 1997-12-10 | Ford Motor Co | Hydraulic system for an internal combustion engine |
US5586533A (en) * | 1994-07-29 | 1996-12-24 | Caterpillar Inc. | Engine compression braking valve actuator apparatus |
AT403835B (en) * | 1994-07-29 | 1998-05-25 | Hoerbiger Ventilwerke Ag | DEVICE AND METHOD FOR INFLUENCING A VALVE |
DE10135377A1 (en) * | 2001-07-20 | 2003-02-13 | Wolfgang Nestler | Hydraulic drive and control for IC engine gas changing valve has oil supplied to space between differential pistons acting as valve shaft for controlling valve opening |
US6907851B2 (en) | 2002-05-14 | 2005-06-21 | Caterpillar Inc | Engine valve actuation system |
EP1416128A1 (en) * | 2002-10-30 | 2004-05-06 | Caterpillar Inc. | System for delaying the intake valve closing time in an engine |
CN101988451B (en) * | 2009-08-04 | 2016-11-30 | 瓦锡兰瑞士公司 | High pressure connection and attachment means |
CN101988451A (en) * | 2009-08-04 | 2011-03-23 | 瓦锡兰瑞士公司 | High pressure connection and connection arrangement |
EP2295786A1 (en) * | 2009-08-04 | 2011-03-16 | Wärtsilä Schweiz AG | High pressure connection and connection arrangement |
CN102713173A (en) * | 2009-11-20 | 2012-10-03 | 罗伯特·博世有限公司 | Electrohydraulic actuator |
CN103388502A (en) * | 2013-07-31 | 2013-11-13 | 哈尔滨工程大学 | Full changeable electro-hydraulic air valve driving device |
CN103388502B (en) * | 2013-07-31 | 2016-01-27 | 哈尔滨工程大学 | A kind of full changeable electro-hydraulic air valve drive unit |
CN104632317A (en) * | 2015-01-30 | 2015-05-20 | 哈尔滨工程大学 | Vent valve device for high-power low-speed marine diesel engine |
CN104791043A (en) * | 2015-04-23 | 2015-07-22 | 哈尔滨工程大学 | Valve electro-hydraulic driving system and method for achieving Miller cycle of engine |
GB2572965A (en) * | 2018-04-17 | 2019-10-23 | Caterpillar Inc | Exhaust valve actuation system |
CN110500156A (en) * | 2019-08-29 | 2019-11-26 | 上海联芊电子科技有限公司 | A kind of valve actuator, internal combustion engine, engine and the vehicles |
CN114087076A (en) * | 2022-01-24 | 2022-02-25 | 龙口中宇热管理***科技有限公司 | Engine cylinder closing valve control device and method |
CN114087076B (en) * | 2022-01-24 | 2022-05-13 | 龙口中宇热管理***科技有限公司 | Engine cylinder closing valve control device and method |
Also Published As
Publication number | Publication date |
---|---|
KR910020298A (en) | 1991-12-19 |
DE69103323T2 (en) | 1994-12-01 |
EP0455937B1 (en) | 1994-08-10 |
DE455937T1 (en) | 1992-02-27 |
JPH0444408U (en) | 1992-04-15 |
JP2527268Y2 (en) | 1997-02-26 |
DK0455937T3 (en) | 1994-12-12 |
KR940010284B1 (en) | 1994-10-22 |
JPH04128508A (en) | 1992-04-30 |
DE69103323D1 (en) | 1994-09-15 |
JP2809354B2 (en) | 1998-10-08 |
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