CN102330617B - Adaptive variable compression engine piston - Google Patents
Adaptive variable compression engine piston Download PDFInfo
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- CN102330617B CN102330617B CN 201110253913 CN201110253913A CN102330617B CN 102330617 B CN102330617 B CN 102330617B CN 201110253913 CN201110253913 CN 201110253913 CN 201110253913 A CN201110253913 A CN 201110253913A CN 102330617 B CN102330617 B CN 102330617B
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- 238000007906 compression Methods 0.000 title claims abstract description 61
- 230000006835 compression Effects 0.000 title claims abstract description 60
- 230000003044 adaptive effect Effects 0.000 title abstract 2
- 238000002485 combustion reaction Methods 0.000 claims abstract description 44
- 239000000203 mixture Substances 0.000 claims abstract description 39
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 239000007921 spray Substances 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 194
- 239000010720 hydraulic oil Substances 0.000 claims description 21
- 210000000707 wrist Anatomy 0.000 claims description 20
- 238000005461 lubrication Methods 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000010304 firing Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 230000003028 elevating effect Effects 0.000 claims description 6
- 239000006071 cream Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009183 running Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The invention provides an adaptive variable compression engine piston, relating to an engine piston. The invention is characterized in that the piston is composed of a gas mixture combustion pressure control piston lifting system, an oil filling system and a cooling system, wherein the gas mixture combustion pressure control piston lifting system comprises an upper oil chamber (4) consisting of a piston shell (1) and an upper oil pressure piston (2) and a lower oil chamber (28) consisting of the piston shell (1) and a lower oil pressure piston (17); the oil filling system comprises a connecting rod internal oil duct (22), a connecting rod small end oil groove (21), a piston pin internal oil duct (25), a piston lower support internal oil groove (27) and an oil filling check valve (16); the cooling system comprises the connecting rod internal oil duct (22), the connecting rod small end oil groove (21) which is communicated with the piston pin internal oil duct (25) and a cooling oil spray hole (24), and a cooling oil duct (8). The piston can be automatically adapted to the compression ratios of the engine under different working conditions and can greatly enhance gas mixture combustion efficiency and torque under medium and low loads.
Description
Technical field
The present invention relates to a kind of engine piston, particularly relate to a kind of self-adaption compression ratio variable engine piston.
Background technique
Increasing compression ratio can increase substantially efficient and the power of motor, the compression ratio of general motor is with reference to WOT, be that the full admission amount is set and immutable, and the general most time of vehicle all is operated in the middle-low load state, throttle opening this moment mixed gas less, that enter in the cylinder is less, in compression at the end, mixed gas density does not reach setting value, so that combustion efficiency is lower, as, when middle-low load working condition, improve corresponding compression ratio, can significantly improve combustion efficiency, the saving fuel oil of motor.For so that Modern Engine can be brought into play better efficient in the operating mode of various variations, existing many units have developed the variable compression ratio engine technology in recent years, the compression that actively changes motor recently realizes engine performance under the different operating modes, adopts recently capable of saving fuel oil of high compression when the little load of motor; When the large load of motor, adopt low compression ratio, improve the consumption of moment of torsion, power and the fuel oil of motor under different operating modes.
Existing engine piston is not all following a few class according to structure, and has following problem.
1. by the control mechanism piston stroke:
Variable compression ratio engine, GoEngine variable compression ratio engine (VCR) is by changing body mechanical structure, and piston stroke reaches the purpose of variable compression ratio.Exist motor to change large, control system mechanism complexity, the shortcomings such as larger, the instantaneous operating mode of volume can't adapt to, implementation cost height.
2. change the height of piston self by control mechanism:
As: " a kind of motor of belt variable compression ratio piston " CN101387228A; " variable-compression-ratio piston " CN201443440U; All use high pressure oil pump, regulate the height that changes piston self to the piston fuel feeding by special-purpose oil duct in bent axle, the connecting rod.Exist motor to change large, the shortcomings such as control system mechanism is complicated, instantaneous operating mode can't adapt to, implementation cost height.
3. firing pressure control break piston oneself height:
As: " variable-compression ratio piston of combustion engine " CN201794677U and " Telescopic piston apparatus " CN201078279Y.Be by mixture combustion pressure control break piston oneself height.Exist weight large, under different rotating speeds, so that initial tension of spring and mixture combustion pressure can not matched well, can't realize required compression ratio, and the piston head heat radiation is difficult, the shortcoming of performance difficulty because of the impact of piston inertia.
As fully visible, change existing piston structure mode, in order to satisfying the needs of motor when the different operating mode, and further improve combustion efficiency, become the technical problem that needs to be resolved hurrily in the engine design.
Summary of the invention
The object of the present invention is to provide a kind of self-adaption compression ratio variable engine piston, this piston structure mode can adapt to the compression ratio of motor under different operating modes automatically, under middle-low load, can significantly promote mixture combustion efficient and moment of torsion, satisfy the need of work of motor when different operating mode.
The objective of the invention is to be achieved through the following technical solutions:
The self-adaption compression ratio variable engine piston, by mixture combustion pressure control piston elevating system, oil-supplementing system, cooling system forms, include piston shell, upper hydraulic piston, loam cake, sensingpiston, upper changeover valve, the repairing Oil preserving piston, wrist pin, the connecting rod body of rod, the sensingpiston Returnning spring, described mixture combustion pressure control piston elevating system, include the upper oil cavitie that piston shell and upper hydraulic piston form, reach the lower oil cavitie that is formed by piston shell and lower hydraulic piston, upper hydraulic piston and lower hydraulic piston are rigidly connected, and be provided with lower oil cavitie hydraulic oil and flow to lower unidirectional valve to upper oil cavitie, upper oil cavitie hydraulic oil is communicated with the upper oil cavitie oil duct through the upper changeover valve oil duct of upper changeover valve open and close controlling, and is provided with by loam cake at the top of upper hydraulic piston, the sensingpiston that communicates with the firing chamber, the mixture combustion pressure sensing driving mechanism that the sensingpiston return spring forms.
Described self-adaption compression ratio variable engine piston, its described oil-supplementing system comprise connecting rod internal oil channel, connecting rod small end oil groove, wrist pin internal oil channel, piston lower support inner oil sump and compensate oily one-way valve; Cooling system comprises connecting rod internal oil channel, connecting rod small end oil groove and wrist pin internal oil channel, cooling spray oilhole.
Described self-adaption compression ratio variable engine piston, its described oil-supplementing system, lubrication pressure oil duct in bent axle is supplied to the lubrication pressure oil in the connnecting rod big end oil groove, transfer to connecting rod small end oil groove, wrist pin internal oil channel, piston lower support inner oil sump and compensate oily one-way valve through the connecting rod internal oil channel and transfer to lower oil cavitie, and through repairing oil storage oil duct, be stored in the bottom of repairing Oil preserving piston in the repairing shoe cream room; At the top of repairing piston filling nitrogen pressure gas.
Described self-adaption compression ratio variable engine piston, its described cooling system, cooling oil duct communicate with oil back chamber and the lubrication pressure of connecting rod internal oil channel oil, communicate with wrist pin internal oil channel, cooling spray oilhole through the connecting rod small end oil groove.
Described self-adaption compression ratio variable engine piston, its described engine piston, the rigidly connected up and down hydraulic piston of each stroke, relative piston shell produce inertial force, and causing up and down, hydraulic fluid chamber respectively produces pressure one time.
Described self-adaption compression ratio variable engine piston, it sets the inertial force that lower one-way valve pretightening force produces because moving up and down less than hydraulic piston, reach the sectional area in upper changeover valve oil duct, lower unidirectional valve oil road, make hydraulic piston in the single stroke, the motion needed time that relative piston shell makes progress is greater than moving downward needed time.
Described self-adaption compression ratio variable engine piston, its described engine piston, through set the relative piston shell of its single stroke hydraulic piston move upward needed time, change fluctuating range, the compression ratio that motor is all being set under different solar terms door aperture.
Described self-adaption compression ratio variable engine piston, its sensingpiston is through the switching of the upper changeover valve of mixture combustion pressure control; The piston shell bottom is provided with the fixing piston shell lower support of screw, and the wrist pin in being installed in the piston shell lower support links to each other with connecting rod small end.
Described self-adaption compression ratio variable engine piston, its described sensingpiston is through the driving to-and-fro motion of mixture combustion pressure, hydraulic oil back and forth flows between the cooling oil duct that communicates and oil back chamber, and the in-house heat of mixture combustion pressure-driven is conducted in the oil back chamber.
Described self-adaption compression ratio variable engine piston, its described mixture combustion pressure-driven mechanism is by threshold value and the lower unidirectional valve pretightening force of setting sensingpiston, the switching that makes it to control changeover valve changes the volume of firing chamber.
Advantage of the present invention and effect are:
The present invention can stepless real-time adjusting compression ratio automatically adapt to instantaneous operating mode, without obvious Volume Changes, can actually replace install, mechanism is simple, implement easily;
2. the present invention can adapt to the compression ratio of motor under different operating modes automatically, can significantly promote mixture combustion efficient, moment of torsion under middle-low load.The major cycle of oil circuit is so that piston head heat radiation is better because the mobile cushioning of hydraulic jack is arranged so that knock resistance promotes, shake little, to motor without large change just change piston, connecting rod both can, and without the electronic control system of complexity.
Description of drawings
Fig. 1 is the plan view of exemplary embodiment of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 1;
Fig. 4 is the C-C sectional view of Fig. 2;
Fig. 5 is the D-D sectional view of Fig. 2;
Fig. 6 is the E-E sectional view of Fig. 2;
Fig. 7 is the F-F sectional view of Fig. 2;
Fig. 8 is that the A of Fig. 3 is to view.
Embodiment
The present invention is described in detail with reference to the accompanying drawings.
Mark among the figure:
1 - piston housing? 2 - on the hydraulic piston? 3 - Hydraulic oil return hole? 4 - oiling chamber; 5 - cover; 6 - sensing piston; 7 - rotate the valve ; 8 - cooling oil channel; 9 - fill the oil reservoir chamber sets; 10 - fill the oil reservoir piston? 11 - turn valves on oil passages; 12 - oil chamber oil passage 13 - seals? 14 - under the one-way valve 15 -? lubricating oil into the cooling channel; 16 - compensation oil check valve 17 - under the hydraulic piston; 18 - compensation conservator oil passage; 19 - piston lower support; 20 - piston pin; 21 - rod Small End tank; 22 - rod oil passage within; 23 - even levers body; 24 - cooling injection holes? 25 - piston pin internal oil passages; 26 - back to the oil chamber; 27 - piston lower supporting tank; 28 - under the oil chamber; 29 - lubricating oil return channel cooling; 30 - sensing piston return spring; 31 - piston lower supporting screws
As shown in the figure:
Self-adaption compression ratio variable engine piston of the present invention is comprised of following 3 systems: mixture combustion pressure control piston elevating system, oil-supplementing system, cooling system.
Mixture combustion pressure control piston elevating system comprises: the upper oil cavitie 4 that is formed by piston shell 1 and upper hydraulic piston 2 reaches the lower oil cavitie 28 that is formed by piston shell 1 and lower hydraulic piston 17, upper hydraulic piston 2 and lower hydraulic piston 17 are rigidly connected, and be provided with the lower unidirectional valve 14 that lower oil cavitie hydraulic oil flows to upper oil cavitie, upper oil cavitie hydraulic oil is through the upper changeover valve oil duct 11 of upper changeover valve 7 open and close controlling, with flow to lower oil cavitie (28) after upper oil cavitie oil duct 12 is communicated with, and be provided with by loam cake 5 at the top of upper hydraulic piston 2, the sensingpiston 6 that communicates with the firing chamber, the mixture combustion pressure sensing driving mechanism that sensingpiston return spring 30 forms, can control according to mixture combustion pressure the switching of upper changeover valve 7 by sensingpiston 6, be provided with the piston shell lower support 19 of fixing by screw 31 in the bottom of piston shell, and by being installed in the wrist pin 20 in the piston shell lower support 19, link to each other with connecting rod small end.
For keeping long-term operation the present invention to be provided with oil-supplementing system: comprise the lubrication pressure oil by connecting rod internal oil channel 22, through connecting rod small end oil groove 21, wrist pin internal oil channel 25, piston lower support inner oil sump 27, reach the oily one-way valve 16 of compensation and transfer to lower oil cavitie 28, and be stored in the bottom of repairing shoe cream room 9 interior repairing pistons by repairing oil storage oil duct 18; At the top of repairing piston filling nitrogen pressure gas.
For keeping long-term operation the present invention to be provided with cooling system: comprise by the lubrication pressure oil of connecting rod internal oil channel 22, communicate with wrist pin internal oil channel 25, cooling spray oilhole 24 through connecting rod small end oil groove 21, reach cooling oil duct 8, oil back chamber 26 communicates.
The present invention includes the upper oil cavitie that is formed by piston shell and upper hydraulic piston, reach the lower oil cavitie that is formed by piston shell and lower hydraulic piston, upper hydraulic piston and lower hydraulic piston are rigidly connected, and be provided with lower oil cavitie hydraulic oil and flow to lower unidirectional valve to upper oil cavitie, upper oil cavitie hydraulic oil is through the upper changeover valve oil duct of upper changeover valve open and close controlling, be communicated with rear to lower oil cavitie with the upper oil cavitie oil duct, and be provided with by loam cake at the top of upper hydraulic piston, the sensingpiston that communicates with the firing chamber, the mixture combustion pressure sensing driving mechanism that the sensingpiston return spring forms, pass through sensingpiston, can be according to mixture combustion pressure, control the switching of changeover valve, bottom at piston shell, be provided with the piston shell lower support that is screwed, and link to each other with connecting rod small end by the wrist pin that is installed in the piston shell lower support.
For guaranteeing that the present invention is stable for a long time, minimizing is provided with oil-supplementing system because of the long-term operation oil starvation, take from the lubrication pressure oil of engine crankshaft, lubrication pressure oil duct in bent axle is supplied to the lubrication pressure oil in the connnecting rod big end oil groove, transfer to connecting rod small end oil groove, wrist pin internal oil channel, piston lower support inner oil sump and compensate oily one-way valve through the connecting rod internal oil channel and transfer to lower oil cavitie, and be stored in the repairing shoe cream room by repairing oil storage oil duct.
For guaranteeing that the present invention's heat load stable for a long time, that reduce piston is provided with cooling system, comprise that cooling oil duct communicates with oil back chamber and the lubrication pressure of connecting rod internal oil channel oil, communicate with wrist pin internal oil channel, cooling spray oilhole through the connecting rod small end oil groove.
Working principle of the present invention:
The present invention is by setting the threshold value of mixture combustion pressure sensing driving mechanism sensingpiston, and lower unidirectional valve pretightening force, whether reach the threshold value of sensingpiston according to mixture combustion pressure, control the switching of changeover valve, and utilize the rigidly connected up and down inertia of hydraulic piston, regulate the upper-lower position of the relative piston shell of hydraulic piston, thereby change the volume of firing chamber, so that compression ratio can be regulated automatically with mixture combustion pressure, improve mixture combustion efficient.
The rigidly connected hydraulic piston of each stroke of the present invention, can produce inertial force by relative piston shell, so that hydraulic fluid chamber respectively produces pressure one time up and down, force rigidly connected up and down hydraulic piston, piston shell moves up and down relatively, its state is, when piston shell moves to middle of stroke in lower dead center, upper oil cavitie pressure is large, and when piston shell moved to top dead center at middle of stroke, lower oil cavitie pressure was large, when piston shell moves to middle of stroke at top dead center, lower oil cavitie pressure is large, and when piston shell moved to lower dead center at the middle part, upper oil cavitie pressure was large.The inertial force that produces because moving up and down less than hydraulic piston by setting lower one-way valve pretightening force, reach the sectional area in upper changeover valve oil duct, lower unidirectional valve oil road, so that hydraulic piston is in the single stroke, the motion needed time that makes progress of piston shell is greater than moving downward needed time relatively.In exhaust, air-breathing, compression stroke, because mixed gas is without burning, so that chamber pressure is lower than the threshold value of sensingpiston, upper changeover valve is closed, and the hydraulic oil of upper oil cavitie can't flow to lower oil cavitie.Because inertia can only be that lower oil cavitie oil passes through lower one-way valve to the upper oil cavitie fuel feeding, forcing the relative piston shell of hydraulic piston to be done moves up, increasing compression ratio is also because setting the restriction of flow, behind single or several times stroke, increase above the compression ratio that sets, when explosion stroke, be lower than setting value such as compression ratio, then the mixture combustion firing pressure is lower than the threshold value of sensingpiston, and upper changeover valve continues to close.Continue exhaust, air-breathing, the compression stroke process, because the inertia lower oil cavitie passes through lower one-way valve, continuation is to upper oil cavitie fuel feeding increasing compression ratio, when actual compression ratio increases above set definite value, mixture combustion pressure is greater than the threshold value of sensingpiston, upper changeover valve is opened, so that upper oil cavitie hydraulic oil is by the upper oil cavitie oil duct, upper changeover valve oil duct, oil back chamber, the hydraulic oil return port flows to lower oil cavitie, so that rigidly connected hydraulic jack, piston shell moves down relatively, increases combustion chamber volume and reduces firing pressure, until mixture combustion pressure is lower than the threshold value of sensingpiston, upper changeover valve is closed, and finishes one action.Continue reciprocation cycle so that hydraulic jack fluctuates up and down at the relative piston shell in compression ratio position that sets, by setting single stroke hydraulic piston, the motion needed time that relative piston shell makes progress changes fluctuating range, reduces wear.So that motor under different throttle openings, all can in the compression ratio work of setting, improve mixture combustion efficient.
Oil-supplementing system of the present invention is taken from the lubrication pressure oil of engine crankshaft, pressure oil duct in bent axle is supplied to connnecting rod big end, pressure oil in the oil groove, through transfer to connecting rod small end oil groove, wrist pin internal oil channel, piston lower support inner oil sump through the connecting rod internal oil channel, reach the oily one-way valve of compensation and transfer to lower oil cavitie, and by repairing oil storage oil duct, be stored in the bottom of repairing piston in the repairing shoe cream room, at the top of repairing piston filling nitrogen pressure gas, to guarantee the transient compensation of hydraulic oil.Be subjected to to-and-fro motion under the driving of mixture combustion pressure at sensingpiston, so that hydraulic oil back and forth flows between the cooling oil duct that communicates and oil back chamber, with the in-house heat of mixture combustion pressure-driven, conduct in the oil back chamber, simultaneously, hydraulic oil in the upper lower oil cavitie, move up and down and behind explosion stroke at piston shell, upper lower oil cavitie hydraulic oil back and forth flows, so that the heat in the upper oil cavitie conducts to lower oil cavitie, oily by the lubrication pressure in the connecting rod oil line behind the lower hydraulic piston, through the wrist pin internal oil channel, cooling spray oilhole and piston lower support inner oil sump, hydraulic piston base injcction cold oil is to reduce the heat load of piston downwards.
Further describe the state of motor of the present invention when two kinds of situation runnings:
The A closure increases suddenly:
On the basis of original compression ratio, because the unexpected increase of air inflow, so that actual compression ratio is higher than desired value.Pinking occurs this moment, and mixture combustion pressure surpasses the sensingpiston threshold value, and upper changeover valve is opened, and mixture combustion pressure forces oil cylinder piston descending rapidly, discharges the bags and alleviates tendency to detonate, and slow down the impact to connecting rod.
The B closure reduces suddenly:
This moment, air inflow reduced, need increasing compression ratio and the compression of upper one-stroke smaller, along with moving up and down of piston, so that the hydraulic oil in the upper oil cavitie produces pressure, but because upper changeover valve is closed, so that the hydraulic oil of upper oil cavitie can't flow to lower oil cavitie by upper changeover valve, because of lower one-way valve pretightening force less than hydraulic jack inertial force, so that the hydraulic oil that lower one-way valve is opened lower oil cavitie flows to upper oil cavitie by lower one-way valve, force on the relative piston shell of rigidly connected hydraulic jack and move increasing compression ratio to satisfy the demand.
Claims (10)
1. self-adaption compression ratio variable engine piston, by mixture combustion pressure control piston elevating system, oil-supplementing system, cooling system forms, include piston shell, upper hydraulic piston, loam cake, sensingpiston, upper changeover valve, the repairing Oil preserving piston, wrist pin, the connecting rod body of rod, the sensingpiston Returnning spring, it is characterized in that: described mixture combustion pressure control piston elevating system, include the upper oil cavitie (4) that piston shell (1) and upper hydraulic piston (2) form, reach the lower oil cavitie (28) that is formed by piston shell (1) and lower hydraulic piston (17), upper hydraulic piston (2) is rigidly connected with lower hydraulic piston (17), and be provided with lower oil cavitie hydraulic oil and flow to lower unidirectional valve (14) to upper oil cavitie, upper oil cavitie hydraulic oil is communicated with upper oil cavitie oil duct (12) through the upper changeover valve oil duct (11) of upper changeover valve (7) open and close controlling, and is provided with by loam cake (5) at the top of upper hydraulic piston (2), the sensingpiston that communicates with the firing chamber (6), the mixture combustion pressure sensing driving mechanism that sensingpiston Returnning spring (30) forms.
2. self-adaption compression ratio variable engine piston according to claim 1, it is characterized in that: described oil-supplementing system comprises connecting rod internal oil channel (22), connecting rod small end oil groove (21), wrist pin internal oil channel (25), piston lower support inner oil sump (27) and compensates oily one-way valve (16); Cooling system comprises connecting rod internal oil channel (22), connecting rod small end oil groove (21), wrist pin internal oil channel (25), cooling spray oilhole (24), cooling oil duct (8), oil back chamber (26).
3. self-adaption compression ratio variable engine piston according to claim 2, it is characterized in that, described oil-supplementing system, lubrication pressure oil duct in bent axle is supplied to the lubrication pressure oil in the connnecting rod big end oil groove, transfer to connecting rod small end oil groove (21), wrist pin internal oil channel (25), piston lower support inner oil sump (27) and compensate oily one-way valve (16) through connecting rod internal oil channel (22) and transfer to lower oil cavitie, and be stored in the bottom of repairing Oil preserving piston (10) in the repairing shoe cream room through repairing oil storage oil duct (18); At the top of repairing Oil preserving piston filling nitrogen pressure gas.
4. self-adaption compression ratio variable engine piston according to claim 2, it is characterized in that: described cooling system, the lubrication pressure oil of connecting rod internal oil channel (22) communicates with wrist pin internal oil channel (25), cooling spray oilhole (24) through connecting rod small end oil groove (21), and the lubrication pressure of connecting rod internal oil channel (22) oil also communicates with cooling oil duct (8), oil back chamber (26).
5. self-adaption compression ratio variable engine piston according to claim 1 is characterized in that: described engine piston, the relative piston shell of the rigidly connected up and down hydraulic piston of each stroke produces inertial force, causes lower oil cavitie and respectively produces pressure one time.
6. self-adaption compression ratio variable engine piston according to claim 1, it is characterized in that: set the inertial force that lower unidirectional valve pretightening force produces because moving up and down less than hydraulic piston up and down, reach the sectional area in upper changeover valve oil duct (11), lower unidirectional valve oil road, hydraulic piston is in the single stroke about making, and the motion needed time that relative piston shell makes progress is greater than moving downward needed time.
7. self-adaption compression ratio variable engine piston according to claim 1, it is characterized in that: described engine piston, through set its single stroke up and down the relative piston shell of the hydraulic piston needed time that moves upward change fluctuating range, motor is all being worked under the compression ratio of setting under the different solar terms door aperture.
8. self-adaption compression ratio variable engine piston according to claim 1 is characterized in that: the switching of sensingpiston (6) changeover valve (7) in the control of mixture combustion pressure; The piston shell bottom is provided with the fixing piston shell lower support (19) of screw (31), and the wrist pin (20) in being installed in piston shell lower support (19) links to each other with connecting rod small end.
9. self-adaption compression ratio variable engine piston according to claim 2, it is characterized in that: described sensingpiston (6) is through the driving to-and-fro motion of mixture combustion pressure, hydraulic oil back and forth flows between the cooling oil duct that communicates (8) and oil back chamber (26), and the heat in the mixture combustion pressure sensing driving mechanism is conducted in the oil back chamber.
10. self-adaption compression ratio variable engine piston according to claim 9, it is characterized in that: described mixture combustion pressure sensing driving mechanism is by threshold value and the lower unidirectional valve pretightening force of setting sensingpiston, and the switching that makes it to control changeover valve changes the volume of firing chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110253913 CN102330617B (en) | 2011-08-31 | 2011-08-31 | Adaptive variable compression engine piston |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110253913 CN102330617B (en) | 2011-08-31 | 2011-08-31 | Adaptive variable compression engine piston |
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| CN102330617A CN102330617A (en) | 2012-01-25 |
| CN102330617B true CN102330617B (en) | 2013-04-03 |
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| CN 201110253913 Expired - Fee Related CN102330617B (en) | 2011-08-31 | 2011-08-31 | Adaptive variable compression engine piston |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8662026B2 (en) * | 2012-02-10 | 2014-03-04 | Federal-Mogul Corporation | Piston with supplemental cooling gallery and internal combustion engine therewith |
| CN103114908B (en) * | 2013-03-11 | 2014-12-17 | 范伟俊 | Engine with compression ratios variable |
| CN105508046B (en) * | 2016-01-20 | 2017-12-15 | 吉林大学 | A kind of variable-compression-ratio piston |
| CN107489511A (en) * | 2016-12-23 | 2017-12-19 | 宝沃汽车（中国）有限公司 | A kind of vehicle, engine and piston connecting rod unit cooling body |
| CN107762641B (en) * | 2017-09-07 | 2020-04-21 | 浙江锋锐发动机有限公司 | Continuous variable compression ratio engine device and compression ratio conversion method |
| CN108019287B (en) * | 2017-12-15 | 2020-07-03 | 东风汽车集团有限公司 | Cylinder body cylinder cover and top cover assembly of variable compression ratio engine |
| CN108590849B (en) | 2018-01-09 | 2023-07-14 | 西华大学 | A crank-link mechanism capable of realizing Miller cycle and its control method |
| CN108547707A (en) * | 2018-05-17 | 2018-09-18 | 象山浦动机械科技有限公司 | Split type steel top steel skirt piston |
| CN108843458A (en) * | 2018-08-10 | 2018-11-20 | 芜湖钻石航空发动机有限公司 | A kind of variable compression ratio engine and its implementation |
| CN111425313A (en) * | 2020-03-20 | 2020-07-17 | 唐为民 | Combined piston with variable compression ratio |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3714762A1 (en) * | 1987-05-04 | 1988-11-24 | Bayerische Motoren Werke Ag | PISTON WITH VARIABLE HEIGHT |
| JP4464916B2 (en) * | 2005-12-28 | 2010-05-19 | 本田技研工業株式会社 | Control device for hydraulic actuator in piston |
| JP4283271B2 (en) * | 2005-12-28 | 2009-06-24 | 本田技研工業株式会社 | Variable compression ratio device for internal combustion engine |
| KR101114378B1 (en) * | 2009-10-06 | 2012-02-15 | 현대자동차주식회사 | Variable compression ratio |
| CN101900056B (en) * | 2010-07-27 | 2012-01-11 | 武汉理工大学 | Internal combustion engine variable compression ratio piston |
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