CN105508046A - Piston with variable compression ratio - Google Patents
Piston with variable compression ratio Download PDFInfo
- Publication number
- CN105508046A CN105508046A CN201610034993.3A CN201610034993A CN105508046A CN 105508046 A CN105508046 A CN 105508046A CN 201610034993 A CN201610034993 A CN 201610034993A CN 105508046 A CN105508046 A CN 105508046A
- Authority
- CN
- China
- Prior art keywords
- piston
- inner sleeve
- pin
- compression ratio
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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
- F02B75/044—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of an adjustable piston length
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
Abstract
The invention discloses a piston with a variable compression ratio. The piston comprises an upper piston body, a lower piston body, locking pins, leaf springs and a motor driving device and is characterized in that a motor stator is fixed to a motor base in the center of an inner sleeve; the inner sleeve is connected with the lower piston body through bosses and fixed under the restraint of snap rings; a fixed wheel structure is arranged at the upper end of a motor rotor, and connecting devices are arranged around the wheel structure and used for being connected with the tail ends of the leaf springs; another circle of cylindrical pin base is arranged on the periphery of the inner sleeve, four pin holes are formed in the upper portion of the pin base and used for installing the locking pins, pin heads of the locking pins are of a crescent structure and are matched with locking grooves in the inner wall of the upper piston body, and pin tails of the locking pins are connected with the head ends of the leaf springs through connecting holes; the springs are installed between pin holes of the locking pins and pin holes of the inner sleeve and have a resetting effect on the locking pins. The number of parts of the piston is small, and the structure of the piston is simple; the compression ratio of an engine is instantly changed through the traction effect of a motor, and thus the engine has good power performance and fuel economy under different working conditions.
Description
Technical field
The invention belongs to a kind of piston of automobile engine, is a kind of piston of variable compression ratio in particular.
Background technique
Compression ratio is the ratio of the maximum volume of cylinder when lower dead center and the cylinder minimum volume when top dead center, the words that compression ratio is large, compress at the end mixture pressure and temperature higher, rate of burning speeds, and thus the combustion efficiency of motor can improve, but the compression ratio of motor can not be too high, because for petrol engine, the words that compression ratio is high can produce pinking, and for reducing the impact that pinking brings to motor, this problem seems particularly outstanding in the design of supercharged engine.Fixing compression ratio becomes the very important factor of restriction engine driven supercharging and turbosupercharged engine one.We know, after turbosupercharging gets involved, the temperature and pressure of firing chamber can significantly raise, if this value is too high, pinking is just inevitable.This can produce huge injury to motor, also can affect Power output simultaneously.So turbosupercharging and the mechanically-sapercharged engine of fixing compression ratio can only design more much lower than common naturally aspirated engine compression ratio.But the design of this too low compression ratio, motor can be caused again when particularly turbosupercharging does not get involved completely, and combustion efficiency is very low, few many of the power that the power that can produce produces than common naturally aspirated engine.This contradiction is the major reason impelling Designer to develop variable compression ratio engine.
The object of variable compression ratio is the fuel economy improving supercharged engine.In supercharged engine, in order to prevent pinking. its compression ratio is lower than naturally aspirated engine.When low pressure, the thermal efficiency reduces. and fuel economy is declined.Special in turbosupercharged engine due to supercharging level rise slowly under low compression ratio condition moment of torsion rise also very slow. form so-called turbo lag phenomenon.That is, motor is when low speed, and pressurization is delayed. wait until motor accelerate to certain rotating speed after pressurization system just play a role.In order to address this problem, variable compression ratio is important method.In other words. make compression ratio bring up to identical with naturally aspirated engine compression ratio or exceed at the running on the lower load of low pressure: on the other hand. suitably reduce compression ratio under the high load operating mode in high pressure-charging.In other words, along with the change of load regulates compression ratio continuously. the thermal efficiency can be improved from low-load in high whole condition range.
The compression ratio of general motor is immutable, because combustion chamber volume and displacement are all fixing parameters, reserves in the design.But, in order to make modern engine function play better efficiency in the operating mode of various change, artificers make motor compression ratio by the control break motor of ECU in running by installing some mechanical assemblys additional.
But there is Railway Project in variable compression ratio engine technology at present.It mainly contains change cylinder head being carried out to a large amount of complexity, manufacture cost is increased greatly, the mechanical assembly having installed large amount of complex additional makes reliability reduce, cost increases, the realization of changeable compression ratio technique must have two component relative movements each other in addition, so can sealing problem be the critical problem causing variable compressive realize, above variety of problems result in the restriction of changeable compression ratio technique.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned problem, provide a kind of variable-compression-ratio piston, it changes by the relative position changed between piston head and connecting rod power character, the fuel economy that engine compression ratio makes motor all have under different load operating mode.
For solving the problems of the technologies described above, the present invention adopts following technological scheme to realize:
A kind of variable-compression-ratio piston, comprises piston upper body, piston lower body, lock pin, spring, reed and motor drive unit, it is characterized in that:
Described motor stator is fixed on the motor cabinet at inner sleeve center, inner sleeve is fixed on piston lower body by snap ring, there is fixing round wheel construction spring fitting inner sleeve between the groove and the pin-and-hole of inner sleeve of lock pin rotor upper end that is connected with piston lower body, connection set is had to be used for connecting reed tail end around circle wheel construction, the pin tail of the head end traction lock shotpin of reed, inner sleeve is connected with piston lower body and fixes under the constraint of snap ring, and piston upper body is connected by guide plate with piston lower body.
The periphery of described inner sleeve is that another encloses columniform key seat, four equally distributed pin-and-holes are arranged at key seat top, the plunger of lock pin is that cross section is trapezoidal arc structure and matches with the lock groove of piston upper body inwall, the pin tail of lock pin is that shaft-like shape structure is connected by attachment hole with the head end of reed, has four equally distributed boss at the bottom of the seat of inner sleeve.
Described piston upper body divides section part to have four equally distributed pilot holes, and the inwall place of piston upper body has upper and lower two circle cross sections to be trapezoidal lock groove.
Described piston lower body divides section to be cast with four equally distributed guide plates to be inserted in four corresponding equally distributed pilot holes of piston upper body, piston lower body bottom surface to have four frustoconic shape shrinkage pools.
Described reed is the elastic metallic structure that head and the tail have connection set.
Compared with prior art the invention has the beneficial effects as follows:
1. adopt motor-driven mode to make mechanical motion more reliable.
2. the pressure that make use of working medium in the inertial force of piston and cylinder, to promote being separated from each other and combination of piston space, reduces the driving power of motor greatly, makes the control strategy installing electric machine at internal piston additional become possibility.
3., owing to only changing in piston body, do not relate to the cylinder head even change of overall engine, make the good manufacturability of this invention.
4. the mechanical parts quantity owing to installing additional is few, and part belongs to kit ripe on standard piece and market, so the cost of this invention is low.
5. owing to connecting rotor and lock pin with reed, reed plays buffer function, makes the present invention can not be too high to the precise requirements of motor.
Relative deficiency part of the present invention is to be used for the compression ratio of two-stage variable and can not be used for electrodeless variable compression ratio engine.
Accompanying drawing explanation
Accompanying drawing 1 is the main sectional view of piston assembly.
Accompanying drawing 2 is oblique drawings of internal piston.
Accompanying drawing 3 is main sectional views of motor cabinet part.
Accompanying drawing 4 is A-A projection views that motor cabinet part master analyses and observe.
Accompanying drawing 5 is plan views of lock pin.
Accompanying drawing 6 is plan views of lock pin.
In figure: piston upper body 1, lock pin 2, inner sleeve 3, snap ring 4, reed 5, spring 6, motor (rotor 7, motor stator 8), piston lower body 9.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As Fig. 1,2, whole piston is divided into piston upper body 1 and piston lower body 9 two parts, the bottom surface periphery of piston upper body 1 has four fan-shaped pilot holes, inwall has the trapezoidal lock groove of two circles, the end face of piston lower body 9 has four fan-shaped guide plates corresponding with the pilot hole of piston upper body 1, and base is cast with four conical shrinkage pools.
As Fig. 5,6, lock pin 2 is columniform parts, before to be cast with cross section be trapezoidal circular arc plunger with the inwall two of piston upper body 1 enclose trapezoidal lock groove match after have the rigid stick shape pin tail of cylindrical cross-section for being connected reed 5.
As Fig. 3,4, the bottom of inner sleeve 3 has four conical shrinkage pools of four conical boss and piston lower body 9 to match the rotation of incompatible restriction inner sleeve 3 on axial direction, the center of inner sleeve 3 is that cylindrical electrical machine seat is used for fixing motor stator 8, the periphery of inner sleeve 3 is that another encloses columniform key seat, and key seat top has four pin-and-holes to be used for installing lock pin 2 and spring 6.
Snap ring 4 is rigid structural that the circular arc do not overlapped by the inside and outside center of circle is formed, and has certain elasticity, for preventing inner sleeve 3 to be shifted, plays maintenance, stable.
As Fig. 2, reed 5 is four flexible steel disc compositions, and play buffering, the effect of the pin tail of traction lock shotpin 2, there is attachment hole reed 5 two ends, and head end connects the pin tail of lock pin 2, and tail end connects rotor 7.
As Fig. 1,2, motor is divided into motor stator 8 and rotor 7, and motor stator 8 is fixed in inner sleeve 3, and rotor 7 rotates, and there is fixing round wheel construction rotor 7 upper end, has four connection sets to be used for connecting reed 6 around circle wheel construction.
Spring 6 is arranged between the pin-and-hole of lock pin 2 and the pin-and-hole of inner sleeve 3, plays a part lock pin 2 return.
If when motor needs low compression ratio, in breathing process, connecting rod pulls piston that piston is moved to lower dead center by top dead center, the plunger of lock pin 2 is in the lower lock groove of piston upper body 1, now cylinder interior gas pressure is very little and close to atmospheric pressure so ignore, when piston is close to lower dead center, now rotor 7 rotates, band movable contact spring 5 tightens, reed 5 Strain lock shotpin 2 is separated with the lower lock groove of piston upper body 1 and spring 6 is in compressive state, now between piston upper body 1 with piston lower body 9 without any being connected, at lower dead center place, piston lower body 9 moves in the opposite direction owing to being subject to the effect of connecting rod, move to former direction due to the effect of inertial force in piston upper body 1, therefore piston upper body 1 reduces with the relative distance of piston lower body 9, when the upper lock groove of piston upper body 1 just aligns with lock pin 2 plunger, motor quits work, now the plunger of lock pin 2 is under the effect of Compress Spring 6, in insertion in lock groove, under now motor operates in low compression ratio operating mode.
If when motor needs high compression ratio, in exhaust process, connecting rod pulls piston that piston is moved to top dead center by lower dead center, the plunger of lock pin 2 is in the upper lock groove of piston upper body 1, now cylinder interior gas pressure slightly larger than atmospheric pressure so ignore, when the piston is near the top dead centre, now rotor 7 rotates, band movable contact spring 5 tightens, lock pin 2 is separated with the upper lock groove of piston upper body 1 reed 5 taut wire line and spring 6 is in compressive state, now between piston upper body 1 with piston lower body 9 without any being connected, at top dead center place, piston lower body 9 moves in the opposite direction owing to being subject to the effect of connecting rod, move to former direction due to the effect of inertial force in piston upper body 1, therefore piston upper body 1 increases with the relative distance of piston lower body 9, when the lower lock groove of piston upper body 1 just aligns with lock pin 2 plunger, motor quits work, now the plunger of lock pin 2 is under the effect of Compress Spring 6, in insertion in lock groove, under now motor operates in high compression ratio operating mode.
Claims (5)
1. the invention discloses a kind of variable-compression-ratio piston, comprise piston upper body (1), piston lower body (9), lock pin (2), spring (6), reed (5) and motor drive unit, it is characterized in that: described motor stator (8) is fixed on the motor cabinet at inner sleeve (3) center, inner sleeve (3) is fixed on piston lower body (9) by snap ring (4), spring (6) is arranged on rotor (7) upper end that is connected with piston lower body (9) of inner sleeve (3) between the groove of lock pin (2) and the pin-and-hole of inner sleeve (3) fixing round wheel construction, connection set is had to be used for connecting reed (5) tail end around circle wheel construction, the pin tail of the head end traction lock shotpin (2) of reed (5), inner sleeve (3) is connected with piston lower body (9) and fixes under the constraint of snap ring (4), piston upper body (1) is connected by guide plate with piston lower body (9).
2. variable compression ratio engine according to claim 1, it is characterized in that: the periphery of described inner sleeve (3) is that another encloses columniform key seat, four equally distributed pin-and-holes are arranged at key seat top, the plunger of lock pin (2) is that cross section is trapezoidal arc structure and matches with the lock groove of piston upper body (1) inwall, the pin tail of lock pin (2) is that shaft-like shape structure is connected by attachment hole with the head end of reed (5), has four equally distributed boss at the bottom of the seat of inner sleeve (3).
3. variable compression ratio engine according to claim 1, it is characterized in that: described piston upper body (1) point section part has four equally distributed pilot holes, the inwall place of piston upper body (1) has upper and lower two circle cross sections to be trapezoidal lock groove.
4. variable compression ratio engine according to claim 1, it is characterized in that: described piston lower body (9) point section is cast with four equally distributed guide plates and is inserted in four corresponding equally distributed pilot holes of piston upper body (1), piston lower body (9) bottom surface has four frustoconic shape shrinkage pools.
5. variable compression ratio engine according to claim 1, is characterized in that: described reed (5) is the elastic metallic structure that head and the tail have connection set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610034993.3A CN105508046B (en) | 2016-01-20 | 2016-01-20 | A kind of variable-compression-ratio piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610034993.3A CN105508046B (en) | 2016-01-20 | 2016-01-20 | A kind of variable-compression-ratio piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105508046A true CN105508046A (en) | 2016-04-20 |
| CN105508046B CN105508046B (en) | 2017-12-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610034993.3A Expired - Fee Related CN105508046B (en) | 2016-01-20 | 2016-01-20 | A kind of variable-compression-ratio piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105508046B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107288753A (en) * | 2017-08-02 | 2017-10-24 | 广东工业大学 | A kind of engine and its variable lift compression ratio linkage |
| CN108131214A (en) * | 2017-12-20 | 2018-06-08 | 东风汽车集团有限公司 | A kind of piston coupling structure of variable compression ratio engine |
| CN108425763A (en) * | 2018-04-11 | 2018-08-21 | 吉林大学 | A kind of variable-compression-ratio piston adding internal tooth drive structure with trapezoidal thread |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3403662A (en) * | 1967-07-20 | 1968-10-01 | Continental Aviat & Eng Corp | Variable compression ratio piston assembly |
| JP2000136724A (en) * | 1998-11-04 | 2000-05-16 | Isuzu Ceramics Res Inst Co Ltd | Gas engine with main chamber capacity variable means |
| CN200999664Y (en) * | 2007-01-09 | 2008-01-02 | 张杨 | Internal combustion engine cylinder capable of self-adjusting combustion chamber gas pressure |
| CN102330617A (en) * | 2011-08-31 | 2012-01-25 | 李钢 | Adaptive variable compression engine piston |
| CN102782285A (en) * | 2010-03-02 | 2012-11-14 | 丰田自动车株式会社 | Combustion pressure control device |
| CN104018938A (en) * | 2013-02-28 | 2014-09-03 | 现代自动车株式会社 | Variable compression ratio device and internal combustion engine including the same |
| CN104179591A (en) * | 2014-08-12 | 2014-12-03 | 中南大学 | Piston structure capable of realizing variable compression ratio of engine |
| CN205315119U (en) * | 2016-01-20 | 2016-06-15 | 吉林大学 | Variable compression compares piston |
-
2016
- 2016-01-20 CN CN201610034993.3A patent/CN105508046B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3403662A (en) * | 1967-07-20 | 1968-10-01 | Continental Aviat & Eng Corp | Variable compression ratio piston assembly |
| JP2000136724A (en) * | 1998-11-04 | 2000-05-16 | Isuzu Ceramics Res Inst Co Ltd | Gas engine with main chamber capacity variable means |
| CN200999664Y (en) * | 2007-01-09 | 2008-01-02 | 张杨 | Internal combustion engine cylinder capable of self-adjusting combustion chamber gas pressure |
| CN102782285A (en) * | 2010-03-02 | 2012-11-14 | 丰田自动车株式会社 | Combustion pressure control device |
| CN102330617A (en) * | 2011-08-31 | 2012-01-25 | 李钢 | Adaptive variable compression engine piston |
| CN104018938A (en) * | 2013-02-28 | 2014-09-03 | 现代自动车株式会社 | Variable compression ratio device and internal combustion engine including the same |
| CN104179591A (en) * | 2014-08-12 | 2014-12-03 | 中南大学 | Piston structure capable of realizing variable compression ratio of engine |
| CN205315119U (en) * | 2016-01-20 | 2016-06-15 | 吉林大学 | Variable compression compares piston |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107288753A (en) * | 2017-08-02 | 2017-10-24 | 广东工业大学 | A kind of engine and its variable lift compression ratio linkage |
| CN108131214A (en) * | 2017-12-20 | 2018-06-08 | 东风汽车集团有限公司 | A kind of piston coupling structure of variable compression ratio engine |
| CN108131214B (en) * | 2017-12-20 | 2019-11-05 | 东风汽车集团有限公司 | A kind of piston coupling structure of variable compression ratio engine |
| CN108425763A (en) * | 2018-04-11 | 2018-08-21 | 吉林大学 | A kind of variable-compression-ratio piston adding internal tooth drive structure with trapezoidal thread |
| CN108425763B (en) * | 2018-04-11 | 2023-09-29 | 吉林大学 | Variable compression ratio piston with trapezoidal thread and internal tooth transmission structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105508046B (en) | 2017-12-15 |
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