CN105240070A - Variable displacement timing device for engine and operating manner of variable displacement timing device - Google Patents
Variable displacement timing device for engine and operating manner of variable displacement timing device Download PDFInfo
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- CN105240070A CN105240070A CN201510669749.XA CN201510669749A CN105240070A CN 105240070 A CN105240070 A CN 105240070A CN 201510669749 A CN201510669749 A CN 201510669749A CN 105240070 A CN105240070 A CN 105240070A
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Abstract
The invention relates to a variable displacement timing device used in an engine and an operating manner of the variable displacement timing device. The variable displacement timing device comprises a crankshaft, air cylinders, intake valves, exhaust valves, sparking plugs and oil nozzles, wherein the intake valves, the exhaust valves, the sparking plugs and the oil nozzles are arranged in the air cylinders respectively. The crankshaft is a variable hydraulic timing integrated crankshaft. The crankshaft is an airtight pipe formed by connecting multiple U-shaped pipes with hydraulic connection rods. The hydraulic connection rods are divided into the one-way hydraulic connection rods and the bidirectional hydraulic connection rods. The U-shaped pipes in the middle part of the crankshaft are connected through the bidirectional hydraulic connection rods. The U-shaped pipes at the two ends of the crankshaft are connected through the one-way hydraulic connection rods. Each U-shaped pipe is provided with a bearing and connected with a connection rod connected with a piston in each air cylinder through the bearing. One side of the crankshaft is connected with a flywheel. The other side of the crankshaft is connected with a fixed liquid storage tank and a hydraulic pump through sealing rings. The variable displacement timing device has the beneficial effect that through a variable crankshaft timing system, the operation efficiency of the engine is better and more efficient.
Description
Technical field
The invention belongs to technical field of engines, particularly relate to a kind of engine variable discharge capacity advance/retard mechanism and function mode thereof.
Background technique
Existing reciprocating engine, its stroke is all changeless (namely discharge capacity is fixed), when connecting rod moves up and down in cylinder, its suction stroke is equal with working stroke, because motor is in working stroke latter stage, some pressure is not utilized, and but prerelease has fallen the energy dissipation of this part; Result in engine power loss very serious, make fuel economy very low.The exhaust stroke of available engine, because engine stroke is fixed, piston cannot arrive cylinder top, therefore each acting is complete, always some stays in cylinder the waste gas discharged, cannot get rid of clean, which decrease the oxygen proportion of institute's suction gas, the effective ratio of oxygen during loss cylinder compresses; In suction stroke, because the suction stroke of prior art each air-breathing acting is all fixing, namely no matter you need not need will suck in cylinder so many gas, therefore also reduce effective acting of motor; In compression, equally because compression ratio is fixed, oil gas mixing ratio is also fixed, and can only improve the moment of torsion of motor by increasing engine speed.And the hydraulic pump drive hydraulic variable timing integrated bent axle of the present invention by being connected with motor, change the stroke of cylinder, thus realize the variable of engine displacement.The moment of torsion of motor is so not only improve from rotating speed, more can while increase engine speed, increase engine displacement, thus obtain larger output torque, more powerful power is provided, and the increase of discharge capacity just utilizes cylinder excess pressure to realize the raising of moment of torsion, the efficiency utilization ratio of motor therefore greatly can be improved.Improve fuel oil mechanical efficiency, reduce exhaust emissions.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, and a kind of in-engine variable displacement advance/retard mechanism and function mode thereof are provided, fuel economy is greatly improved.
The object of the invention is to have come by following technical solution.This in-engine variable displacement advance/retard mechanism, comprise the intake valve, exhaust valve, spark plug, the oil nozzle that are provided with in bent axle, cylinder and cylinder, described bent axle is the integrated bent axle of hydraulic variable timing, this bent axle is connected by some single u-shaped pipes, hydraulic connecting rod and a hollow shaft, central entity axle and forms an airtight pipeline, and is marked with hydraulic oil in whole bent axle; This hydraulic connecting rod is divided into one-way hydraulic connecting rod and bidirectional hydraulic connecting rod, be formed by connecting by bidirectional hydraulic connecting rod between the U-tube of the intermediate portion of this bent axle and U-tube, each U-tube is provided with bearing, and the connecting rod be connected with the piston in cylinder by this bearing is connected; One end of bent axle is connected with flywheel by central entity axle, this central entity axle is connected by one-way hydraulic connecting rod with between bent axle, the other end of bent axle is connected with hollow shaft by one-way hydraulic connecting rod, sealed by seal ring between this hollow shaft and fixed fitting hollow shaft, this fixed fitting hollow shaft is fixed with liquid container and oil hydraulic pump, and this oil hydraulic pump is connected with engine timing belt.
As preferably, described U-tube inserts hydraulic connecting rod, and the outer wall that the first seal ring of hydraulic connecting rod is close to U-tube forms seal structure movable up and down, and the second seal ring in U-tube and the oil guide pipe outer wall in hydraulic connecting rod form seal structure movable up and down, form double-buckle internally and externally formula seal structure at this point; U-tube is provided with and ensures that bent axle stablizes the first position limit socket with sealing when rotating simultaneously, and hydraulic connecting rod is provided with and ensures that bent axle stablizes the second position limit socket with sealing when rotating.
As preferably, described U-tube two ends are respectively equipped with the first oil guiding hole, and the intermediate interlayer of bidirectional hydraulic connecting rod is provided with the second oil guiding hole, make bidirectional hydraulic connecting rod be divided into upper an actor's rendering of an operatic tune and lower an actor's rendering of an operatic tune by this intermediate interlayer.
Utilize a function mode for in-engine variable displacement advance/retard mechanism described above, comprise the steps:
1), during engine start, drive oil hydraulic pump is started working, oil hydraulic pump makes the pressure of oil hydraulic pump increase along with the raising of engine speed thereupon, and now the hydraulic oil of liquid container can flow in the U-tube that each cylinder connecting rod used connects along with the pressure of oil hydraulic pump; Whole bent axle is made to form telescopic variable integral, when engine speed is greater than 700 revs/min, the pressure that oil hydraulic pump produces can break the initial balance pressure limiting bent axle, and make the distance of each hydraulic connecting rod start to extend, the stroke of reciprocating motion of the pistons increases;
2), engine operation step is as follows: when the first cylinder acting, exhaust valve and IC Intake Valve Closes, oil nozzle oil spout, plug ignition, and gasoline combustion produces heat, volumetric expansion, thus promotes piston and move downward, and starts acting; When rotating speed increases, prexxure of the hydraulic pump increases, and hydraulic connecting rod distance is extended, piston also increases, until pressure balance, when namely hydraulic pressure and cylinder pressure summation equal to extend pressure needed for hydraulic connecting rod moving downward stroke in process thereupon, piston arrives lower dead center, completes working stroke;
Meanwhile, the exhaust valve of the second cylinder is opened, IC Intake Valve Closes; Under bent axle drives, piston starts to move upward, and hydraulic connecting rod starts to shrink within the scope of pressure balance, Distance Shortened; Until piston arrives cylinder head, by clean for exhaust gas inside cylinder discharge, and hydraulic connecting rod elongated distance is now the half that hydraulic connecting rod extends longest distance, completes exhaust stroke;
Meanwhile the intake valve of the 3rd cylinder is opened, exhaust valve closing; Piston moves downward, start in cylinder to suck air, when the hydraulic pressure increases, the distance of hydraulic connecting rod is extended, piston stroke increases, and it is the lower dead center of piston movement that hydraulic connecting rod elongated distance and hydraulic pressure are preserved when balancing, and enters the air increase in cylinder, the discharge capacity of motor is increased, completes suction stroke;
The meanwhile intake valve of the 4th cylinder and exhaust valve closing, piston upwards, until inner cylinder pressure and hydraulic pressure are preserved when balancing, piston arrives top dead center, air is compressed, and completes compression stroke; Now bent axle completes the acting process of 180 °; 4th cylinder commencement of fuel injection, igniting, carry out working stroke, and the first cylinder is exhausted stroke afterwards, and the second cylinder carries out suction stroke, and the 3rd cylinder carries out compression stroke, finally completes 360 ° of actings and rotates; In addition the 3rd cylinder commencement of fuel injection, igniting after, carry out working stroke, and the 4th cylinder is exhausted stroke, the first cylinder carries out suction stroke, and the second cylinder carries out compression stroke; The second last cylinder commencement of fuel injection, igniting, carry out working stroke, and the 3rd cylinder is exhausted stroke, and the 4th cylinder carries out suction stroke, and the first cylinder carries out compression stroke; Complete the power cycle of whole four cylinder engine, i.e. 720 ° of actings, four cylinders do work altogether;
3), during engine stop, the pressure of oil hydraulic pump gets back to the initial balance pressure of bent axle, namely U-tube and hydraulic connecting rod preserve stroke center condition, namely when piston is at the highest notch, hydraulic connecting rod elongated distance is the half that hydraulic connecting rod extends longest distance, is consistent when being 700 revs/min with engine speed.
As preferably, the initial balance pressure of bent axle is 0.1-0.3Mpa, and now setting cylinder working stroke is minimum value, and namely discharge capacity is minimum, and maximum balance pressure is 0.7-1.4Mpa, and namely now setting cylinder working stroke is maximum value, and namely discharge capacity is maximum.
As preferably, described cylinder magnitude setting is the multiple of 4.
As preferably, during setting engine start, be the minimum injection rate of this motor in idle running situation; When engine speed improves, prexxure of the hydraulic pump increases thereupon, and U-tube and hydraulic connecting rod extend to both sides under hydraulic pressure, and bent axle distance is increased, and the stroke of piston increases, and discharge capacity increases; At expansion stroke, pressure is larger, and hydraulic connecting rod extends, and working stroke increases, enhancing of effectively doing work; In exhaust stroke, because barometric pressure is lower than prexxure of the hydraulic pump, cylinder foot can be elongated to all the time gas exhaust gas inside cylinder is discharged completely; In suction stroke, pressure is larger, and hydraulic connecting rod extends, and the gas sucked in cylinder increases; In compression stroke, pressure is larger, and the mixed gas compression degree in cylinder is higher, and compression ratio increases.
As preferably, the scalable distance of the hydraulic connecting rod on described bent axle is 20-60 millimeter, the elongated distance of hydraulic connecting rod be positioned at same hydraulic connecting rod two first position limit socket back sides between spacing; It is spacing between two the first position limit socket back sides of the second position limit socket of hydraulic connecting rod when contacting with the first position limit socket of U-tube that hydraulic connecting rod extends longest distance.
Beneficial effect of the present invention is: utilize variable crankshaft timing system, effectively can change the stroke of piston movement, obtain the power matched, and makes engine operating efficiency more efficiently good.
Accompanying drawing explanation
Fig. 1 is theory structure schematic diagram of the present invention.
Fig. 2 is crankshaft structure schematic diagram of the present invention.
Fig. 3 is U-tube structural representation of the present invention.
Fig. 4 is the cross-sectional view of bidirectional hydraulic connecting rod of the present invention.
Label in accompanying drawing is respectively: 1, bent axle; 2, cylinder; 3, intake valve; 4, exhaust valve; 5, spark plug; 6, oil nozzle; 7, piston; 8, connecting rod; 9, flywheel; 10, liquid container; 11, U-tube; 12, hydraulic connecting rod; 13, bearing; 14, seal ring; 15, hollow shaft; 16, central entity axle; 17, fixed fitting hollow shaft; 20, oil hydraulic pump; 21, the first cylinder; 22, the second cylinder; 23, the 3rd cylinder; 24, four-cylinder; 111, the second seal ring; 112, the first position limit socket; 113, the first oil guiding hole; 121, one-way hydraulic connecting rod; 122, bidirectional hydraulic connecting rod; 123, the first seal ring; 124, oil guide pipe; 125, the second position limit socket; 126, intermediate interlayer; 127, the second oil guiding hole; 128, upper an actor's rendering of an operatic tune; 129, lower an actor's rendering of an operatic tune.
Embodiment
Below in conjunction with accompanying drawing, detailed introduction is done to the present invention: as shown in accompanying drawing 1,2, the present invention includes the intake valve 3, exhaust valve 4, spark plug 5, the oil nozzle 6 that are provided with in bent axle 1, cylinder 2 and cylinder 2, it is characterized in that: described bent axle 1 is the integrated bent axle of hydraulic variable timing, this bent axle 1 is connected by some single u-shaped pipes 11, hydraulic connecting rod 12 and a hollow shaft 15, central entity axle 16 and forms an airtight pipeline, and is marked with hydraulic oil in whole bent axle 1; This hydraulic connecting rod 12 is divided into one-way hydraulic connecting rod 121 and bidirectional hydraulic connecting rod 122, be formed by connecting by bidirectional hydraulic connecting rod 122 between the U-tube 11 of the intermediate portion of this bent axle 1 and U-tube 11, each U-tube 11 is provided with bearing 13, and the connecting rod 8 be connected with the piston 7 in cylinder 2 by this bearing 13 is connected; One end of bent axle 1 is connected with flywheel 9 by central entity axle 16, be connected by one-way hydraulic connecting rod 121 between this central entity axle 16 with bent axle 1, the other end of bent axle 1 is connected with hollow shaft 15 by one-way hydraulic connecting rod 121, sealed by seal ring 14 between this hollow shaft 15 and fixed fitting hollow shaft 17, this fixed fitting hollow shaft 17 is fixed with liquid container 10 and oil hydraulic pump 20, this oil hydraulic pump 20 is connected with engine timing belt.
U-tube 11 as described in accompanying drawing 2,3,4 inserts hydraulic connecting rod 12, and the outer wall that the first seal ring 123 of hydraulic connecting rod 12 is close to U-tube 11 forms seal structure movable up and down, and the second seal ring 111 in U-tube 11 forms seal structure movable up and down with oil guide pipe 124 outer wall in hydraulic connecting rod 12, form double-buckle internally and externally formula seal structure at this point; U-tube 11 is provided with and ensures that bent axle 1 stablizes the first position limit socket 112 with sealing when rotating simultaneously, and hydraulic connecting rod 12 is provided with and ensures that bent axle 1 stablizes the second position limit socket 125 with sealing when rotating.
Described U-tube 11 two ends are respectively equipped with the first oil guiding hole 113, and the intermediate interlayer 126 of bidirectional hydraulic connecting rod 122 is provided with the second oil guiding hole 127, make bidirectional hydraulic connecting rod 122 be divided into upper an actor's rendering of an operatic tune 128 and lower an actor's rendering of an operatic tune 129 by this intermediate interlayer 127.
A function mode for in-engine variable displacement advance/retard mechanism, comprises the steps:
1), during engine start, oil hydraulic pump 20 is driven to start working, oil hydraulic pump 20 makes the pressure of oil hydraulic pump 20 increase along with the raising of engine speed thereupon, and now the hydraulic oil of liquid container 10 can flow in the U-tube 11 that each cylinder 2 connecting rod 8 used connects along with the pressure of oil hydraulic pump 20; Whole bent axle 1 is made to form telescopic variable integral, when engine speed is greater than 700 revs/min, the pressure that oil hydraulic pump 20 produces can break the initial balance pressure limiting bent axle 1, the distance of each hydraulic connecting rod 12 is made to start to extend, the reciprocating stroke of piston 7 increases, thus change the air displacement of cylinder 2, the final moment of torsion changing automobile;
2), engine operation step is as follows: when the first cylinder 21 does work, exhaust valve 4 and intake valve 3 are closed, oil nozzle 6 oil spout, and spark plug 5 is lighted a fire, and gasoline combustion produces heat, volumetric expansion, thus promotion piston 7 moves downward, and starts acting; When rotating speed increases, oil hydraulic pump 20 pressure increase, hydraulic connecting rod 12 is apart from elongation, and piston 7 also increases, until pressure balance moving downward stroke in process thereupon, namely when hydraulic pressure and cylinder pressure summation equal to extend pressure needed for hydraulic connecting rod 12, piston 7 arrives lower dead center, acting pressure is lowered, can obtains the power under environment under low pressure in cylinder, improve motor efficiency, complete working stroke;
Meanwhile, the exhaust valve 4 of the second cylinder 22 is opened, and intake valve 3 is closed; Under bent axle 1 drives, piston 7 starts to move upward, and hydraulic connecting rod 12 starts to shrink within the scope of pressure balance, Distance Shortened; Until piston 7 arrives cylinder 2 top, by clean for exhaust gas inside cylinder discharge, and hydraulic connecting rod 12 elongated distance is now the half that hydraulic connecting rod 12 extends longest distance, completes exhaust stroke;
Meanwhile the intake valve 3 of the 3rd cylinder 23 is opened, and exhaust valve 4 cuts out; Piston 7 moves downward, start to suck air in cylinder 2, when the hydraulic pressure increases, the distance of hydraulic connecting rod 12 is extended, piston 7 stroke increases, and it is the lower dead center that piston 7 moves that hydraulic connecting rod 12 elongated distance and hydraulic pressure are preserved when balancing, and the air entered in cylinder 2 increases, the discharge capacity of motor is increased, completes suction stroke;
Meanwhile the intake valve 3 of the 4th cylinder 24 and exhaust valve 4 are closed, piston 7 moves upward, until cylinder 2 internal pressure and hydraulic pressure are preserved when balancing, piston 7 arrives top dead center, air is compressed, in cylinder, compression ratio is dynamic, and the rotating speed with motor changes and changes, when the engine rotational speed is increased, prexxure of the hydraulic pump increases, hydraulic pressure is larger, and the compression ratio of air is larger, completes compression stroke; Now bent axle 1 completes the acting process of 180 °; 4th cylinder 24 commencement of fuel injection, igniting, carry out working stroke, and the first cylinder 21 is exhausted stroke afterwards, and the second cylinder 22 carries out suction stroke, and the 3rd vapour 23 carries out compression stroke, finally completes 360 ° of actings and rotates; In addition the 3rd cylinder 23 commencement of fuel injection, igniting after, carry out working stroke, and the 4th cylinder 24 is exhausted stroke, the first cylinder 21 carries out suction stroke, and the second cylinder 22 carries out compression stroke; The second last cylinder 22 commencement of fuel injection, igniting, carry out working stroke, and the 3rd cylinder 23 is exhausted stroke, and the 4th cylinder 24 carries out suction stroke, and the first cylinder 21 carries out compression stroke; Complete the power cycle of whole four cylinder engine, i.e. 720 ° of actings, four cylinders do work altogether;
3), during engine stop, the pressure of oil hydraulic pump 20 gets back to the initial balance pressure of bent axle 1, namely U-tube and hydraulic connecting rod 12 preserve stroke center condition, namely when piston 7 is at the highest notch, hydraulic connecting rod 12 elongated distance is the half that hydraulic connecting rod 12 extends longest distance, is consistent when being 700 revs/min with engine speed.。
The initial balance pressure of bent axle 1 is 0.1-0.3Mpa, and now setting cylinder working stroke is minimum value, and namely discharge capacity is minimum; Maximum balance pressure is 0.7-1.4Mpa, and namely now setting cylinder working stroke is maximum value, and namely discharge capacity is maximum.
Described cylinder 2 magnitude setting is the multiple of 4, is to allow engine hydraulic variable displacement timing system stability and balance, and acting is even, just can follow above mode of work-doing.
During setting engine start, be the minimum injection rate of this motor in idle running situation; When engine speed improves, oil hydraulic pump 20 pressure increases thereupon, and U-tube 11 and hydraulic connecting rod 12 extend to both sides under hydraulic pressure, make bent axle 1 apart from growth, and the stroke of piston 7 increases, and discharge capacity increases; At expansion stroke, pressure is larger, and hydraulic connecting rod 12 extends, and working stroke increases, enhancing of effectively doing work; In exhaust stroke, because barometric pressure is lower than oil hydraulic pump 20 pressure, cylinder foot can be elongated to all the time gas exhaust gas inside cylinder is discharged completely; In suction stroke, pressure is larger, and hydraulic connecting rod 12 extends, and the gas sucked in cylinder increases; In compression stroke, pressure is larger, and the mixed gas compression degree in cylinder is higher, and compression ratio increases.
The scalable distance of the hydraulic connecting rod 12 on described bent axle 1 is 20-60 millimeter, the elongated distance of hydraulic connecting rod 12 be positioned at same hydraulic connecting rod 12 two first position limit socket 112 back sides between spacing; It is spacing between two first position limit socket 112 back sides of the second position limit socket 125 of hydraulic connecting rod 12 when contacting with the first position limit socket 112 of U-tube 11 that hydraulic connecting rod 12 extends longest distance.
The present invention's advantage is compared with prior art:
1, utilize variable crankshaft timing system, effectively can change the stroke of piston movement, obtain the power matched, make engine operating efficiency more efficiently good.2, can balance along with hydraulic system pressure and cylinder pressure are formed during acting, change piston to succeed stroke, thus change engine output torque, hydraulic system pressure increases when the engine speed is high, bent axle distance increases simultaneously, means that piston stroke increases, causes cylinder volume to increase, the effective mechanical efficiency of cylinder is improved, and discharge capacity increases; 3, the waste gas after cylinder combustion can being burnt during exhaust completely arranges light, due to the pressure that hydraulic system is formed, opening when exhaust valve is hydraulic connecting rod stroke negative pressure in bent axle, can piston be shifted onto cylinder top, cause the waste gas in cylinder to be excluded totally, what more show from available engine is different.4, upon inhalation, variable crankshaft timing system can provide corresponding bent axle distance, make under different rotating speeds because the pressure of hydraulic system is different, make sucked air also different, make air produce different oil gas mixing ratios from the mixed gas of gasoline, when particularly motor is in high rotating speed, the air sucked will be more, make oil gas mixing ratio more efficiently good, better realize fuel-economizing object.5, during compression, can provide the state of different compression ratio, rotating speed more high compression ratio is higher.6, utilize native system to effectively reduce energy consumption from learning above, improve fuel efficiency, the power needed for automobile under different conditions is provided.Suppose, existing fixed crankshaft length is 6 centimetres, and makes the structure of the integrated bent axle of hydraulic variable timing into, and namely hydraulic connecting rod maximum elongation distance is 4 centimetres, and the elongated distance that piston movement to cylinder top is is 2 centimetres; So maximum variable stroke distances is 6+2=8 centimetre, the distance of bent axle has extended 2 centimetres compared with before, namely effective acting scope adds 33%, because the pressure of available engine cylinder when exhaust opened by exhaust valve is generally all higher than 0.3MPa, therefore feature of the present invention utilizes residual pressure to do work exactly, reduces the residual pressure of cylinder, fuel economy is greatly improved, do not considering, in other loss situations, to utilize design of the present invention, efficiency 25% can be improved.
Embodiment 1
Below for four cylinder engine, cylinder diameter 76 millimeters, minimum stroke is 60 millimeters, and range is 80 millimeters, and scalable distance is 40 millimeters, and namely minimum injection rate is 1.1 liters, and maximum pump discharge is 1.5 liters.During setting engine start, the pressure of the initial hydraulic pump of rotating speed 700 revs/min time is 0.1MPa, and the hydraulic connecting rod elongated distance of the integrated bent axle of hydraulic variable timing is 20 millimeters, and its working stroke is 60 millimeters, and now minimum injection rate is 1.1 liters; When engine speed is up to 8000 revs/min, pressure maximum is 0.9MPa, and the hydraulic connecting rod elongated distance of the integrated bent axle of hydraulic variable timing is 40 millimeters, and its working stroke is 80 millimeters, and now maximum pump discharge is 1.5 liters.When the engine starts, drive oil hydraulic pump is started working, in the idling state, hydraulic oil supercharging in integrated for hydraulic variable timing bent axle is arrived 0.1MPa by oil hydraulic pump, the hydraulic connecting rod of the integrated bent axle of hydraulic variable timing corresponding to each cylinder extends and reaches corresponding state of equilibrium, namely the elongated distance of expansion stroke is 20 millimeters, and its working stroke is 60 millimeters; The elongated distance of exhaust stroke is 20 millimeters and arrives cylinder head; The elongation of suction stroke is 20 millimeters; The elongation of compression stroke is 14 millimeters (compression ratio is 10:1).Along with the raising of engine speed, the oil hydraulic pump delivery pressure driven also increases, the 0.3MPa that hydraulic oil in integrated for hydraulic variable timing bent axle is pressurized to by its oil hydraulic pump when engine speed reaches 2000 revs/min, the hydraulic connecting rod of the integrated bent axle of hydraulic variable timing corresponding to each cylinder extends and reaches corresponding state of equilibrium, namely the elongated distance of expansion stroke is 25 millimeters, and its working stroke is 65 millimeters; The elongated distance of exhaust stroke is 20 millimeters and arrives cylinder head; The elongation of suction stroke is 25 millimeters; The elongation of compression stroke is 13 millimeters (compression ratio is 9.4:1).When engine speed reaches 8000 revs/min, the pressure maximum that hydraulic oil in integrated for hydraulic variable timing bent axle is pressurized to is 0.9MPa by its oil hydraulic pump, the hydraulic connecting rod of the integrated bent axle of hydraulic variable timing corresponding to each cylinder extends and reaches corresponding state of equilibrium, namely the elongated distance of expansion stroke is 40 millimeters, and its working stroke is 80 millimeters; The elongated distance of exhaust stroke is 20 millimeters and arrives cylinder head; The elongation of suction stroke is 40 millimeters; The elongation of compression stroke is 11 millimeters (compression ratio is 8.8:1).When motor changes at rotating speed, institute's drive oil hydraulic pump make to trickle in the integrated bent axle of hydraulic variable timing hydraulic fluid pressure change thus drive the flexible of hydraulic rod, the elongation of each hydraulic connecting rod is all constantly changing above, finally reaches the object changing discharge capacity.We also also can reach above-mentioned same effect by changing oil hydraulic pump powered belt flowing mode simultaneously.
Be understandable that, for a person skilled in the art, technological scheme of the present invention and inventive concept be equal to and replace or change the protection domain that all should belong to the claim appended by the present invention.
Claims (8)
1. an engine variable discharge capacity advance/retard mechanism, comprise the intake valve (3), exhaust valve (4), spark plug (5) and the oil nozzle (6) that are provided with in bent axle (1), cylinder (2) and cylinder (2), it is characterized in that: described bent axle (1) is the integrated bent axle of hydraulic variable timing, this bent axle (1) is connected by some single u-shaped pipes (11), hydraulic connecting rod (12) and a hollow shaft (15), central entity axle (16) and forms an airtight pipeline, and is marked with hydraulic oil in whole bent axle (1), this hydraulic connecting rod (12) is divided into one-way hydraulic connecting rod (121) and bidirectional hydraulic connecting rod (122), be formed by connecting by bidirectional hydraulic connecting rod (122) between the U-tube (11) of the intermediate portion of this bent axle (1) and U-tube (11), each U-tube (11) is provided with bearing (13), the connecting rod (8) be connected with the piston (7) in cylinder (2) by this bearing (13) is connected, one end of bent axle (1) is connected with flywheel (9) by central entity axle (16), be connected by one-way hydraulic connecting rod (121) between this central entity axle (16) with bent axle (1), the other end of bent axle (1) is connected with hollow shaft (15) by one-way hydraulic connecting rod (121), sealed by seal ring (14) between this hollow shaft (15) and fixed fitting hollow shaft (17), this fixed fitting hollow shaft (17) is fixed with liquid container (10) and oil hydraulic pump (20), this oil hydraulic pump (20) is connected with engine timing belt.
2. engine variable discharge capacity advance/retard mechanism according to claim 1, it is characterized in that: described U-tube (11) inserts hydraulic connecting rod (12), and the outer wall that first seal ring (123) of hydraulic connecting rod (12) is close to U-tube (11) forms seal structure movable up and down, and the second seal ring (111) in U-tube (11) forms seal structure movable up and down with oil guide pipe (124) outer wall in hydraulic connecting rod (12), form double-buckle internally and externally formula seal structure at this point; U-tube (11) is provided with and ensures that bent axle (1) stablizes the first position limit socket (112) with sealing when rotating simultaneously, and hydraulic connecting rod (12) is provided with and ensures that bent axle (1) stablizes the second position limit socket (125) with sealing when rotating.
3. in-engine variable displacement advance/retard mechanism according to claim 2, it is characterized in that: described U-tube (11) two ends are respectively equipped with the first oil guiding hole (113), the intermediate interlayer (126) of bidirectional hydraulic connecting rod (122) is provided with the second oil guiding hole (127), makes bidirectional hydraulic connecting rod (122) be divided into upper an actor's rendering of an operatic tune (128) and lower an actor's rendering of an operatic tune (129) by this intermediate interlayer (127).
4. utilize a function mode for engine variable discharge capacity advance/retard mechanism as claimed in claim 1, it is characterized in that: comprise the steps:
1), during engine start, oil hydraulic pump (20) is driven to start working, oil hydraulic pump (20) makes the pressure of oil hydraulic pump (20) increase along with the raising of engine speed thereupon, and now the hydraulic oil of liquid container (10) can flow in the U-tube (11) that each cylinder (2) connecting rod used (8) connects along with the pressure of oil hydraulic pump (20); Whole bent axle (1) is made to form telescopic variable integral, when engine speed is greater than 700 revs/min, the pressure that oil hydraulic pump (20) produces can break the initial balance pressure limiting bent axle (1), make the distance of each hydraulic connecting rod (12) start to extend, the reciprocating stroke of piston (7) increases;
2), engine operation step is as follows: when the first cylinder (21) does work, exhaust valve (4) and intake valve (3) are closed, oil nozzle (6) oil spout, spark plug (5) is lighted a fire, gasoline combustion produces heat, volumetric expansion, thus promotion piston (7) moves downward, and starts acting; When rotating speed increases, oil hydraulic pump (20) pressure increase, hydraulic connecting rod (12) distance is extended, piston (7) also increases moving downward stroke in process thereupon, until pressure balance, namely, when hydraulic pressure and cylinder pressure summation equal to extend pressure needed for hydraulic connecting rod (12), piston (7) arrives lower dead center, completes working stroke;
Meanwhile, the exhaust valve (4) of the second cylinder (22) is opened, and intake valve (3) is closed; Under bent axle (1) drives, piston (7) starts to move upward, and hydraulic connecting rod (12) starts to shrink within the scope of pressure balance, Distance Shortened; Until piston (7) arrives cylinder (2) top, by clean for exhaust gas inside cylinder discharge, and hydraulic connecting rod (12) elongated distance is now the half that hydraulic connecting rod (12) extends longest distance, completes exhaust stroke;
Meanwhile the intake valve (3) of the 3rd cylinder (23) is opened, and exhaust valve (4) cuts out; Piston (7) moves downward, cylinder starts to suck air in (2), when the hydraulic pressure increases, the distance of hydraulic connecting rod (12) is extended, piston (7) stroke increases, and it is the lower dead center that piston (7) moves that hydraulic connecting rod (12) elongated distance and hydraulic pressure are preserved when balancing, and the air entered in cylinder (2) increases, the discharge capacity of motor is increased, completes suction stroke;
Meanwhile the intake valve (3) of the 4th cylinder (24) and exhaust valve (4) are closed, piston (7) moves upward, until cylinder (2) internal pressure and hydraulic pressure are preserved when balancing, piston (7) arrives top dead center, air is compressed, and completes compression stroke; Now bent axle (1) completes the acting process of 180 °; 4th cylinder (24) commencement of fuel injection, igniting afterwards, carry out working stroke, and the first cylinder (21) is exhausted stroke, the second cylinder (22) carries out suction stroke, 3rd vapour (23) carries out compression stroke, finally completes 360 ° of actings and rotates; In addition the 3rd cylinder (23) commencement of fuel injection, igniting after, carry out working stroke, and the 4th cylinder (24) is exhausted stroke, the first cylinder (21) carries out suction stroke, and the second cylinder (22) carries out compression stroke; The second last cylinder (22) commencement of fuel injection, igniting, carry out working stroke, and the 3rd cylinder (23) is exhausted stroke, and the 4th cylinder (24) carries out suction stroke, and the first cylinder (21) carries out compression stroke; Complete the power cycle of whole four cylinder engine, i.e. 720 ° of actings, four cylinders do work altogether;
3), during engine stop, the pressure of oil hydraulic pump (20) gets back to the initial balance pressure of bent axle (1), namely U-tube and hydraulic connecting rod (12) preserve stroke center condition, namely when piston (7) is at the highest notch, hydraulic connecting rod (12) elongated distance is the half that hydraulic connecting rod (12) extends longest distance, is consistent when being 700 revs/min with engine speed.
5. the function mode of in-engine variable displacement advance/retard mechanism according to claim 4, it is characterized in that: the initial balance pressure of described bent axle (1) is 0.1-0.3MPa, now setting cylinder working stroke is minimum value, and namely discharge capacity is minimum; Maximum balance pressure is 0.7-1.4Mpa, and namely now setting cylinder working stroke is maximum value, and namely discharge capacity is maximum.
6. the function mode of in-engine variable displacement advance/retard mechanism according to claim 4, is characterized in that: described cylinder (2) magnitude setting is the multiple of 4.
7. the function mode of in-engine variable displacement advance/retard mechanism according to claim 4, is characterized in that: during setting engine start, be the minimum injection rate of this motor in idle running situation; When engine speed improves, oil hydraulic pump (20) pressure increases thereupon, U-tube (11) and hydraulic connecting rod (12) extend to both sides under hydraulic pressure, bent axle (1) distance is increased, the stroke of piston (7) increases, and discharge capacity increases; At expansion stroke, pressure is larger, and hydraulic connecting rod (12) extends, and working stroke increases, enhancing of effectively doing work; In exhaust stroke, because barometric pressure is lower than oil hydraulic pump (20) pressure, cylinder foot can be elongated to all the time gas exhaust gas inside cylinder is discharged completely; In suction stroke, pressure is larger, and hydraulic connecting rod (12) extends, and the gas sucked in cylinder increases; In compression stroke, pressure is larger, and the mixed gas compression degree in cylinder is higher, and compression ratio increases.
8. the function mode of in-engine variable displacement advance/retard mechanism according to claim 4, it is characterized in that: the scalable distance of the hydraulic connecting rod (12) on described bent axle (1) is 20-60 millimeter, the elongated distance of hydraulic connecting rod (12) for be positioned at same hydraulic connecting rod (12) two the first position limit socket (112) back sides between spacing; It is spacing between two first position limit socket (112) back sides of second position limit socket (125) of hydraulic connecting rod (12) when contacting with first position limit socket (112) of U-tube (11) that hydraulic connecting rod (12) extends longest distance.
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| CN201510669749.XA CN105240070B (en) | 2015-10-13 | 2015-10-13 | A kind of engine variable discharge capacity advance/retard mechanism and its function mode |
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| CN105240070B CN105240070B (en) | 2018-07-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404130A (en) * | 2018-12-12 | 2019-03-01 | 中国北方发动机研究所(天津) | A kind of change stroke hydraulic device |
| CN113694277A (en) * | 2021-08-18 | 2021-11-26 | 苏州才豪电子科技有限公司 | Multistage pressure regulating formula blood filtration device |
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|---|---|---|---|---|
| EP1205652A1 (en) * | 2000-11-14 | 2002-05-15 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Variable compression ratio mechanism with two hydraulically operated valves in the crank shaft |
| CN101936229A (en) * | 2010-07-23 | 2011-01-05 | 高伟 | Variable volume compression ratio engine |
| CN102877960A (en) * | 2012-10-17 | 2013-01-16 | 赵立军 | Engine with variable compression ratio |
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- 2015-10-13 CN CN201510669749.XA patent/CN105240070B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1205652A1 (en) * | 2000-11-14 | 2002-05-15 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Variable compression ratio mechanism with two hydraulically operated valves in the crank shaft |
| CN101936229A (en) * | 2010-07-23 | 2011-01-05 | 高伟 | Variable volume compression ratio engine |
| CN102877960A (en) * | 2012-10-17 | 2013-01-16 | 赵立军 | Engine with variable compression ratio |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404130A (en) * | 2018-12-12 | 2019-03-01 | 中国北方发动机研究所(天津) | A kind of change stroke hydraulic device |
| CN109404130B (en) * | 2018-12-12 | 2021-07-16 | 中国北方发动机研究所(天津) | Stroke-variable hydraulic device |
| CN113694277A (en) * | 2021-08-18 | 2021-11-26 | 苏州才豪电子科技有限公司 | Multistage pressure regulating formula blood filtration device |
| CN113694277B (en) * | 2021-08-18 | 2024-05-24 | 国药集团上海血液制品有限公司 | Multistage pressure regulating formula hemofiltration device |
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| CN105240070B (en) | 2018-07-24 |
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