WO2019103085A1 - 可変圧縮装置及びエンジンシステム - Google Patents
可変圧縮装置及びエンジンシステム Download PDFInfo
- Publication number
- WO2019103085A1 WO2019103085A1 PCT/JP2018/043126 JP2018043126W WO2019103085A1 WO 2019103085 A1 WO2019103085 A1 WO 2019103085A1 JP 2018043126 W JP2018043126 W JP 2018043126W WO 2019103085 A1 WO2019103085 A1 WO 2019103085A1
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- Prior art keywords
- piston rod
- hydraulic
- chamber
- cylinder
- compression device
- Prior art date
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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
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups
- F01B9/02—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with crankshaft
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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
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B31/00—Component parts, details, or accessories not provided for in, or of interest apart from, other groups
- F01B31/14—Changing of compression ratio
-
- 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
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
- F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
-
- 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
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
-
- 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
- F02B75/00—Other engines
- F02B75/32—Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
- F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/04—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads with elastic intermediate part of fluid cushion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/06—Adjustable connecting-rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J7/00—Piston-rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/30—Ships, e.g. propelling shafts and bearings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/22—Internal combustion engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Definitions
- the present disclosure relates to a variable compression device and an engine system.
- Priority is claimed on Japanese Patent Application No. 2017-225617, filed Nov. 24, 2017, the content of which is incorporated herein by reference.
- Patent Document 1 discloses a large reciprocating piston combustion engine having a crosshead.
- the large-sized reciprocating piston combustion engine of Patent Document 1 is a dual fuel engine that can be operated with both liquid fuel such as heavy oil and gaseous fuel such as natural gas.
- the compression ratio is changed by moving the piston rod hydraulically so as to correspond to both the compression ratio suitable for operation with liquid fuel and the compression ratio suitable for operation with gaseous fuel.
- An adjustment mechanism is provided at the crosshead portion.
- hydraulic oil (hydraulic fluid) is supplied to a hydraulic chamber (fluid chamber) provided in the crosshead, and is disposed in the fluid chamber by the hydraulic fluid
- the compression ratio is changed by lifting the piston rod.
- the piston rod is disposed on the bottom of the fluid chamber, the amount of working fluid flowing between the piston rod and the bottom of the fluid chamber is small when the working fluid is supplied to the fluid chamber, and the piston rod
- the pressure receiving area between the and working fluid is small Therefore, it may be difficult to lift the piston rod from the bottom of the fluid chamber. Therefore, it is necessary to ensure the pressure receiving area of the hydraulic oil necessary to lift the piston rod at all times.
- the present disclosure has been made in view of the above-described problems, and it is an object of the variable compression device to allow the working fluid to move the piston rod even when the piston rod is in contact with the bottom of the fluid chamber. I assume.
- a variable compression device having a piston rod and a fluid chamber supplied with a pressurized working fluid and moving the piston rod in a direction to increase a compression ratio.
- a variable compression device is adopted, in which a groove is formed on the bottom of the fluid chamber or on the contact surface of the piston rod in contact with the bottom of the fluid chamber.
- the bottom surface of the fluid chamber is formed with a supply opening for working fluid, and the groove is formed to overlap the supply opening.
- Adopt a compression device.
- variable compression device provides, as a third aspect, the variable compression device according to the second aspect, wherein a recess is formed on the bottom surface or the contact surface radially outward of the piston rod relative to the grooved channel.
- variable compression device in which the groove channel is annular.
- an engine system which comprises the variable compression device described in any of the first to fourth means.
- the working fluid flowing into the fluid chamber can flow into the groove to increase the area in which the working fluid contacts the piston rod. This makes it easy to lift the piston rod by the working fluid. Therefore, even when the piston rod is in contact with the bottom surface of the fluid chamber, the piston rod can be moved in the direction to increase the compression ratio.
- FIG. 1 is a cross-sectional view of an engine in accordance with an embodiment of the present disclosure. It is a schematic cross section which shows a part of engine in one embodiment of this indication.
- FIG. 3 is a cross-sectional view taken along the line AA of FIG.
- An engine system 100 is mounted on a vessel such as a large tanker, for example, and includes an engine 1, a supercharger 200, and a control unit 300, as shown in FIG.
- the engine 1 will be described as a main engine, the supercharger 200 as an auxiliary, and the engine 1 (main engine) and the supercharger 200 (auxiliary) will be described separately.
- the turbocharger 200 it is also possible to configure the turbocharger 200 as a part of the engine 1.
- the engine 1 is a multi-cylinder uniflow scavenging diesel engine and can execute a gas operation mode in which a gaseous fuel such as natural gas is burned together with a liquid fuel such as heavy oil and a diesel operation mode in which a liquid fuel such as heavy oil is burned is there. In the gas operation mode, only gaseous fuel may be burned.
- Such an engine 1 includes a frame 2, a cylinder portion 3, a piston 4, an exhaust valve unit 5, a piston rod 6, a crosshead 7, a hydraulic portion 8, a connecting rod 9, and a crank angle sensor 10. , A crankshaft 11, a scavenging air reservoir 12, an exhaust gas reservoir 13, and an air cooler 14.
- a cylinder is constituted by the cylinder portion 3, the piston 4, the exhaust valve unit 5 and the piston rod 6.
- the side where the exhaust valve unit 5 is provided may be the upper side
- the side where the crankshaft 11 described later is provided may be the lower side.
- a view from the direction of the central axis of the piston rod 6 may be referred to as a plan view.
- the frame 2 is a strength member that supports the entire engine 1, and the crosshead 7, the hydraulic unit 8, and the connecting rod 9 are accommodated. Further, in the inside of the frame 2, a cross head pin 7a described later of the cross head 7 is provided to be capable of reciprocating.
- the cylinder portion 3 has a cylindrical cylinder liner 3a, a cylinder head 3b, and a cylinder jacket 3c.
- the cylinder liner 3a is a cylindrical member, and a sliding surface on which the piston 4 slides is formed inside.
- a space surrounded by the inner circumferential surface of the cylinder liner 3a and the piston 4 is a combustion chamber R1.
- a plurality of scavenging ports S arranged along the circumferential direction are formed in the lower portion of the cylinder liner 3a. Each scavenging port S has an opening that opens to the inner peripheral surface and the outer peripheral surface of the cylinder liner 3a, and communicates the scavenging chamber R2 inside the cylinder jacket 3c with the inside of the cylinder liner 3a.
- the cylinder head 3 b is a lid member and is provided at the upper end of the cylinder liner 3 a.
- the cylinder head 3 b includes an exhaust port H formed at a central portion in a plan view, and is connected to the exhaust reservoir 13. Further, the cylinder head 3 b is provided with a fuel injection valve (not shown). Further, an in-cylinder pressure sensor (not shown) is provided in the vicinity of the fuel injection valve of the cylinder head 3b. The in-cylinder pressure sensor detects the pressure in the combustion chamber R1 and transmits the pressure to the control unit 300.
- the cylinder jacket 3c is a cylindrical member and is provided between the frame 2 and the cylinder liner 3a.
- the lower end portion of the cylinder liner 3a is inserted, and the cylinder jacket 3c includes a scavenging chamber R2 formed therein.
- the scavenging chamber R2 of the cylinder jacket 3c is connected to the scavenging air reservoir 12.
- the piston 4 is a substantially cylindrical member, is connected to a piston rod 6 described later, and is disposed inside the cylinder liner 3a. Further, a gap between the piston 4 and the cylinder liner 3 a is sealed by a piston ring (not shown) provided on the outer peripheral surface of the piston 4. The piston 4 slides in the cylinder liner 3a with the piston rod 6 due to the pressure fluctuation in the combustion chamber R1.
- the exhaust valve unit 5 has an exhaust valve 5a, an exhaust valve housing 5b, and an exhaust valve drive unit 5c.
- the exhaust valve 5a is provided inside the cylinder head 3b, and closes the exhaust port H in the cylinder unit 3 by the exhaust valve drive unit 5c.
- the exhaust valve housing 5b is a cylindrical housing, and the end portion remote from the cylinder portion 3 of the exhaust valve 5a is accommodated.
- the exhaust valve drive unit 5 c is an actuator that moves the exhaust valve 5 a in a direction along the stroke direction of the piston 4.
- the piston rod 6 is an elongated member, one end of which is connected to the piston 4 and the other end of which is connected to the crosshead pin 7a.
- the other end of the piston rod 6 is inserted into the crosshead pin 7a, and the connecting rod 9 is rotatably coupled to the crosshead pin 7a.
- the piston rod 6 has a flange whose diameter of a part of the other end is thicker than the diameter of the other part of the piston rod 6.
- the cross head 7 has a cross head pin 7a, a guide shoe 7b, and a lid member 7c.
- the cross head pin 7 a is a cylindrical member, and movably connects the piston rod 6 and the connecting rod 9.
- the crosshead pin 7a has an insertion space into which the other end of the piston rod 6 is inserted.
- a hydraulic chamber R3 (fluid chamber) is formed between the piston rod 6 and the flange, in which supply and discharge of hydraulic fluid (working fluid) are performed.
- the lower surface of the flange of the piston rod 6 and the bottom surface of the insertion space which is the bottom surface of the hydraulic chamber R3 are parallel to each other. Further, as shown in FIG.
- the crosshead pin 7a is provided with an annular groove R6 and an annular recess R7 formed on the outer side in the radial direction of the groove R6 on the bottom of the hydraulic chamber R3. It is done.
- the grooved channel R6 is formed to overlap the opening of the supply channel R4 described later and the opening of the relief channel R5 in plan view.
- the recess R7 is annularly formed on the bottom surface of the hydraulic chamber R3 along the outer edge thereof.
- a discharge port O penetrating along the axial direction of the crosshead pin 7a is formed on the lower side than the center.
- the outlet O is an opening through which the cooling oil (lubricating fluid) that has passed through a cooling flow passage (not shown) of the piston rod 6 flows and is discharged.
- the crosshead pin 7a is provided with a supply flow passage R4 connecting the hydraulic pressure chamber R3 and the plunger pump 8c described later, and a relief flow passage R5 connecting the hydraulic pressure chamber R3 and the relief valve 8f described later .
- the guide shoe 7b is a member for rotatably supporting the cross head pin 7a, and moves on a guide rail (not shown) along the stroke direction of the piston 4 along with the cross head pin 7a.
- the movement of the guide shoe 7b along the guide rail restricts the rotational movement of the crosshead pin 7a, and also restricts the movement of the piston 4 along a direction other than the linear direction along the stroke direction.
- the lid member 7c is an annular member and is fixed to the upper portion of the crosshead pin 7a, and the end of the piston rod 6 remote from the cylinder portion 3 is inserted.
- Such crosshead 7 transmits the linear motion of the piston 4 to the connecting rod 9.
- the hydraulic unit 8 includes a supply pump 8a, a rocking pipe 8b, a plunger pump 8c, a first check valve 8d and a second check valve 8e which the plunger pump 8c has, and a relief valve. And 8f. Further, the piston rod 6, the crosshead 7, the hydraulic unit 8, and the control unit 300 function as a variable compression device in the present disclosure.
- the supply pump 8a is a pump that pressurizes hydraulic oil supplied from a hydraulic oil tank (not shown) and supplies the hydraulic oil to the plunger pump 8c based on an instruction received from the control unit 300.
- the supply pump 8a is driven by the power of the battery of the ship, and can be operated before liquid fuel is supplied to the combustion chamber R1.
- the swinging pipe 8b is a pipe that connects the supply pump 8a and the plunger pump 8c of each cylinder, and between the plunger pump 8c that moves with the cross head pin 7a and the supply pump 8a that is fixed and does not move, It is provided swingably.
- the plunger pump 8c is fixed to the cross head pin 7a, and includes a rod-like plunger 8c1, a cylindrical cylinder 8c2 slidably accommodating the plunger 8c1, and a plunger driving unit 8c3.
- the plunger pump 8c slides in the cylinder 8c2 by connecting the plunger 8c1 to a drive unit (not shown), and pressurizes the hydraulic oil and supplies it to the hydraulic chamber R3.
- a first check valve 8d is provided at an opening for discharging the hydraulic oil provided at an end portion close to the supply flow passage R4 of the cylinder 8c2.
- a second check valve 8e is provided at an opening for suctioning the hydraulic oil provided on the side circumferential surface of the cylinder 8c2.
- the plunger driving unit 8c3 is connected to the plunger 8c1 and causes the plunger 8c1 to reciprocate based on an instruction received from the control unit 300.
- the first check valve 8d has a structure in which the valve body is closed by being urged toward the inside of the cylinder 8c2, and the hydraulic oil supplied to the hydraulic pressure chamber R3 flows back to the cylinder 8c2. To prevent.
- the first check valve 8d It is opened by being pushed by the hydraulic fluid in the cylinder 8c2.
- the second check valve 8e has a structure in which the valve body is closed by being biased toward the outside of the cylinder 8c2, and the hydraulic oil supplied to the cylinder 8c2 flows back to the supply pump 8a. To prevent.
- the second check valve 8e When the pressure of the hydraulic oil supplied from the supply pump 8a becomes larger than the biasing force (opening pressure) of the biasing member that biases the valve body of the second check valve 8e, the second check valve 8e The valve body is opened by being pushed by the hydraulic oil supplied from the supply pump 8a.
- the first check valve 8d has a valve opening pressure higher than the valve opening pressure of the second check valve 8e. Therefore, during steady operation where the engine system is operated at a preset compression ratio, the valve is not opened by the pressure of the hydraulic oil supplied from the supply pump 8a.
- the relief valve 8f is provided on the cross head pin 7a, and has a main body 8f1 and a relief valve drive 8f2.
- the main body 8f1 is a valve connected to the hydraulic pressure chamber R3 and a hydraulic oil tank (not shown).
- the relief valve drive unit 8f2 is connected to the main body 8f1 and opens and closes the main body 8f1 based on an instruction received from the control unit 300.
- the relief valve 8f is opened by the relief valve driving unit 8f2, whereby the hydraulic oil stored in the hydraulic chamber R3 is returned to the hydraulic oil tank.
- the connecting rod 9 is an elongated member, one end of which is connected to the crosshead pin 7 a and the other end of which is connected to the crankshaft 11.
- the connecting rod 9 converts the linear motion of the piston 4 transmitted to the crosshead pin 7a into rotational motion.
- the crank angle sensor 10 is a sensor for measuring the crank angle of the crankshaft 11, and transmits a crank pulse signal for calculating the crank angle to the control unit 300.
- the crankshaft 11 is an elongated member, is connected to the connecting rod 9 provided in each cylinder, and rotates by the rotational motion transmitted by the connecting rod 9. Thereby, for example, power is transmitted to a screw or the like.
- the scavenging air reservoir 12 is provided between the cylinder jacket 3c and the supercharger 200, and the air pressurized by the supercharger 200 flows in.
- an air cooler 14 is provided inside the scavenging air reservoir 12.
- the exhaust reservoir 13 is a tubular member, and is connected to the exhaust port H of each cylinder and to the supercharger 200. The gas discharged from the exhaust port H is temporarily stored in the exhaust reservoir 13 and is thus supplied to the turbocharger 200 in a state where pulsation is suppressed.
- the air cooler 14 cools the air inside the scavenging air reservoir 12.
- the turbocharger 200 pressurizes air taken in from an intake port (not shown) by a turbine rotated by the gas discharged from the exhaust port H, and supplies it to the combustion chamber R1 via the scavenging port S.
- the control unit 300 is a computer that controls the amount of supplied fuel and the like based on an operation and the like by the operator of the ship.
- the control unit 300 also controls the hydraulic unit 8 to change the compression ratio in the combustion chamber R1.
- the controller 300 controls the plunger pump 8c, the supply pump 8a, and the relief valve 8f to adjust the amount of hydraulic fluid in the hydraulic chamber R3. Thereby, the position of the piston rod 6 is changed to change the compression ratio.
- the engine system 100 as described above causes the piston 4 to slide in the cylinder liner 3 a to rotate the crankshaft 11 by igniting and detonating the fuel injected from the fuel injection valve (not shown) into the combustion chamber R1. More specifically, the fuel supplied to the combustion chamber R1 is mixed with the pressurized air flowing in from the scavenging port S and then compressed by moving the piston 4 in the stroke direction toward the top dead center. The temperature rises, and it spontaneously ignites. Further, when the fuel is liquid fuel, the temperature of the liquid fuel is increased in the combustion chamber R1, vaporized, and spontaneously ignited.
- the fuel in the combustion chamber R1 is spontaneously ignited and rapidly expands, whereby pressure is applied to the piston 4 in the direction toward the bottom dead center in the stroke direction.
- the piston 4 moves in the direction toward the bottom dead center together with the piston rod 6, and the crankshaft 11 is rotated via the connecting rod 9.
- pressurized air flows from the scavenging port S into the combustion chamber R1.
- the exhaust port H is opened by driving the exhaust valve unit 5.
- the exhaust gas in the combustion chamber R1 is pushed out to the exhaust reservoir 13 via the exhaust port H by the pressurized air.
- the control unit 300 drives the supply pump 8a, and the supply pump 8a supplies hydraulic oil to the plunger pump 8c. Then, the plunger pump 8c is driven by the control unit 300, the hydraulic fluid is pressurized by the plunger pump 8c to a pressure capable of lifting the piston rod 6, and the hydraulic fluid is supplied to the hydraulic chamber R3. At this time, the hydraulic oil that has flowed into the supply flow passage R4 flows into the groove flow passage R6 provided so as to overlap with the opening (supply opening) near the hydraulic pressure chamber R3 in the supply flow passage R4.
- the flange of the piston rod 6 is lifted from the bottom of the hydraulic chamber R3 by the pressure of the hydraulic fluid flowing into the groove R6 formed on the bottom of the hydraulic chamber R3, and the lifted flange and the bottom of the hydraulic chamber R3 The hydraulic oil further flows into the gap between Thereby, the piston rod 6 is moved upward, and the top dead center of the piston 4 is moved upward (that is, near the exhaust port H).
- the relief valve 8f is driven by the control unit 300, and the hydraulic pressure chamber R3 and a hydraulic fluid tank (not shown) are in communication with each other by opening the relief valve 8f. Then, the load of the piston rod 6 is applied to the hydraulic oil of the hydraulic chamber R3, and the hydraulic oil in the hydraulic chamber R3 is pushed out to the hydraulic oil tank via the relief valve 8f. As a result, the hydraulic oil in the hydraulic pressure chamber R3 decreases, the piston rod 6 moves downward (ie, near the crankshaft 11), and the top dead center of the piston 4 moves downward.
- the area where the hydraulic oil contacts the flange of the piston rod 6 can be increased by causing the hydraulic oil that has flowed into the supply channel R4 to flow into the groove channel R6.
- the hydraulic fluid can be guided to the opening (discharge opening) near the hydraulic pressure chamber R3 of the relief flow channel R5 by the groove R6. Hydraulic oil can be discharged from R3.
- the grooved flow passage R6 is provided to overlap the opening (supply opening) close to the hydraulic pressure chamber R3 of the supply flow passage R4 in plan view, so that the hydraulic oil flowing from the supply flow passage R4 into the hydraulic pressure chamber R3 Can be easily guided to the groove R6. Therefore, it is easier to lift the piston rod 6 by the hydraulic fluid, and the responsiveness in increasing the compression ratio can be improved.
- air or hydraulic fluid is stored in advance in the recess R7 by forming the recess R7 outside the groove R6.
- the hydraulic oil supplied from the supply flow passage R4 to the hydraulic pressure chamber R3 spreads in the circumferential direction.
- the hydraulic oil supplied from the supply flow passage R4 to the hydraulic pressure chamber R3 can be quickly guided to a wide area.
- slot R6 is annularly formed, this indication is not limited to this.
- the groove channel R6 may be formed, for example, in a lattice shape. In this case, since the surface area of the groove R6 can be made larger, the hydraulic oil can be guided more efficiently and quickly to a large area.
- the groove R6 may be formed in, for example, a spiral shape. Also in this case, since the surface area of the groove R6 can be made larger, the hydraulic oil can be guided more efficiently and quickly to a large area.
- hollow part R7 is cyclically
- the depressions R7 may be, for example, a plurality of depressions formed at equal intervals along the outer edge of the bottom surface of the hydraulic pressure chamber R3. Also in this case, the sticking of the flange of the piston rod 6 can be prevented as in the above embodiment.
- the recess R7 may not be formed on the bottom surface of the hydraulic pressure chamber R3.
- the recess R7 may be formed on the flange surface of the piston rod 6.
- the recess R7 may be formed inside the groove R6.
- grooved channel R6 is formed in hydraulic pressure chamber R3, this indication is not limited to this.
- the grooved channel may be formed on the lower surface of the flange of the piston rod 6 (contact surface in contact with the bottom surface of the hydraulic pressure chamber R3).
- the grooved channel is formed to overlap with the opening of the supply channel R4 and the opening of the relief channel R5 in plan view.
- the grooved channel can be formed by processing the piston rod 6, the processing is easy.
- the working fluid flowing into the fluid chamber can flow into the groove to increase the area in which the working fluid contacts the piston rod. This makes it easy to lift the piston rod by the working fluid. Therefore, even when the piston rod is in contact with the bottom surface of the fluid chamber, the piston rod can be moved in the direction to increase the compression ratio.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
2 架構
3 シリンダ部
3a シリンダライナ
3b シリンダヘッド
3c シリンダジャケット
4 ピストン
5 排気弁ユニット
5a 排気弁
5b 排気弁筐
5c 排気弁駆動部
6 ピストンロッド
7 クロスヘッド
7a クロスヘッドピン
7b ガイドシュー
7c 蓋部材
8 油圧部
8a 供給ポンプ
8b 揺動管
8c プランジャポンプ
8c1 プランジャ
8c2 シリンダ
8c3 プランジャ駆動部
8d 第1逆止弁
8e 第2逆止弁
8f リリーフ弁
8f1 本体部
8f2 リリーフ弁駆動部
9 連接棒
10 クランク角センサ
11 クランク軸
12 掃気溜
13 排気溜
14 空気冷却器
100 エンジンシステム
200 過給機
300 制御部
H 排気ポート
O 排出口
R1 燃焼室
R2 掃気室
R3 油圧室
R4 供給流路
R5 リリーフ流路
R6 溝流路
R7 窪部
S 掃気ポート
Claims (6)
- ピストンロッドと、昇圧された作動流体が供給されることで圧縮比を高める方向に前記ピストンロッドを移動させる流体室とを有する可変圧縮装置であって、
前記流体室の底面、または前記流体室の底面に接触する前記ピストンロッドの接触面に、溝流路が形成されている、可変圧縮装置。 - 前記底面には、前記作動流体の供給開口が形成され、
前記溝流路は、前記供給開口と重なるように形成されている、請求項1記載の可変圧縮装置。 - 前記底面、または前記接触面には、前記溝流路よりも前記ピストンロッドの径方向外側に、窪部が形成されている、請求項2記載の可変圧縮装置。
- 前記底面、または前記接触面には、前記溝流路よりも前記ピストンロッドの径方向内側に、窪部が形成されている、請求項2記載の可変圧縮装置。
- 前記溝流路は、環状である請求項1~4のいずれか一項に記載の可変圧縮装置。
- 請求項1~5のいずれか一項に記載の可変圧縮装置を有するエンジンシステム。
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CN201880075161.3A CN111356827A (zh) | 2017-11-24 | 2018-11-22 | 可变压缩装置和发动机系统 |
KR1020207009799A KR102274364B1 (ko) | 2017-11-24 | 2018-11-22 | 가변 압축 장치 및 엔진 시스템 |
JP2019555357A JPWO2019103085A1 (ja) | 2017-11-24 | 2018-11-22 | 可変圧縮装置及びエンジンシステム |
EP18882173.0A EP3715600B1 (en) | 2017-11-24 | 2018-11-22 | Variable compression device and engine system |
DK18882173.0T DK3715600T3 (da) | 2017-11-24 | 2018-11-22 | Variabel kompressionsindretning og motorsystem |
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KR (1) | KR102274364B1 (ja) |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07197910A (ja) * | 1993-12-29 | 1995-08-01 | Nabco Ltd | 油圧シリンダ |
JP2004044512A (ja) * | 2002-07-12 | 2004-02-12 | Honda Motor Co Ltd | 内燃機関の圧縮比可変装置 |
JP2014020375A (ja) | 2012-07-17 | 2014-02-03 | Waertsilae Schweiz Ag | 大型往復ピストン燃焼エンジン、ならびにそのようなエンジンを制御する制御機器および方法 |
WO2015108178A1 (ja) * | 2014-01-20 | 2015-07-23 | 株式会社Ihi | クロスヘッド型エンジン |
DE102015203387A1 (de) * | 2015-02-25 | 2016-08-25 | Fev Gmbh | Doppelt wirkender Kolben eines VCR-Motors |
JP2017225617A (ja) | 2016-06-22 | 2017-12-28 | 真彦 宮永 | リユース可能な弁当箱 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN2554669Y (zh) * | 2002-05-24 | 2003-06-04 | 上海柴油机股份有限公司 | 机械套缸式行程控制装置 |
CN106414951B (zh) * | 2014-01-20 | 2018-12-14 | 株式会社 Ihi | 发动机 |
CN204436933U (zh) * | 2014-12-30 | 2015-07-01 | 朱桂林 | 一种内导向抗扭液压缸 |
JP6365570B2 (ja) * | 2016-02-29 | 2018-08-01 | トヨタ自動車株式会社 | 可変長コンロッド及び可変圧縮比内燃機関 |
-
2018
- 2018-11-22 WO PCT/JP2018/043126 patent/WO2019103085A1/ja unknown
- 2018-11-22 JP JP2019555357A patent/JPWO2019103085A1/ja active Pending
- 2018-11-22 EP EP18882173.0A patent/EP3715600B1/en active Active
- 2018-11-22 DK DK18882173.0T patent/DK3715600T3/da active
- 2018-11-22 CN CN201880075161.3A patent/CN111356827A/zh active Pending
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07197910A (ja) * | 1993-12-29 | 1995-08-01 | Nabco Ltd | 油圧シリンダ |
JP2004044512A (ja) * | 2002-07-12 | 2004-02-12 | Honda Motor Co Ltd | 内燃機関の圧縮比可変装置 |
JP2014020375A (ja) | 2012-07-17 | 2014-02-03 | Waertsilae Schweiz Ag | 大型往復ピストン燃焼エンジン、ならびにそのようなエンジンを制御する制御機器および方法 |
WO2015108178A1 (ja) * | 2014-01-20 | 2015-07-23 | 株式会社Ihi | クロスヘッド型エンジン |
DE102015203387A1 (de) * | 2015-02-25 | 2016-08-25 | Fev Gmbh | Doppelt wirkender Kolben eines VCR-Motors |
JP2017225617A (ja) | 2016-06-22 | 2017-12-28 | 真彦 宮永 | リユース可能な弁当箱 |
Non-Patent Citations (1)
Title |
---|
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EP3715600B1 (en) | 2023-03-29 |
KR20200044958A (ko) | 2020-04-29 |
EP3715600A4 (en) | 2021-08-11 |
EP3715600A1 (en) | 2020-09-30 |
CN111356827A (zh) | 2020-06-30 |
JPWO2019103085A1 (ja) | 2020-07-30 |
KR102274364B1 (ko) | 2021-07-07 |
DK3715600T3 (da) | 2023-04-24 |
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