CN101333964B - Variable compression-ratio reciprocating piston engine - Google Patents
Variable compression-ratio reciprocating piston engine Download PDFInfo
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- CN101333964B CN101333964B CN2008100555508A CN200810055550A CN101333964B CN 101333964 B CN101333964 B CN 101333964B CN 2008100555508 A CN2008100555508 A CN 2008100555508A CN 200810055550 A CN200810055550 A CN 200810055550A CN 101333964 B CN101333964 B CN 101333964B
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- eccentric
- compression ratio
- connecting rod
- variable compression
- lower bearing
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Abstract
The utility model relates to an engine with a variable compression ratio, in particular to a reciprocating piston engine with a variable compression ratio; a connecting rod (2) is connected with a connecting rod axel neck (3) on the crank shaft through an eccentric upper bearing (9) and an eccentric lower bearing (10); a slide groove and a stepped hole communicated with the slide groove are machined on a crankshaft balance weight (7) arranged on the crankshaft; wherein, a centrifugal slide block (5) is mounted in the slide groove; the centrifugal slide block (5) is connected with the eccentric lower bearing (10) through a pull rod (4); the small diameter part of the stepped hole is mounted with an adjusting bolt (11); a locking nut (12) is mounted on the adjusting bolt (11); the large diameter part of the stepped hole is mounted with a return spring (8); both ends of the return spring (8) are respectively connected with the adjusting bolt (11) and the centrifugal slide block (5). The engine with a variable compression ratio has the advantages of simple structure and small volume; the variation of the piston stroke is realized through the rotation of the eccentric upper bearing and the eccentric lower bearing arranged on the connecting rod axel neck of the crankshaft, so as to change the volume of the cylinder combustion chamber so that the compression ratio of the cylinder combustion chamber is changed.
Description
Technical field
The present invention relates to a kind of motor of alterable compression ratio, especially a kind of conventional engine of variable compression ratio.
Technical background
The compression ratio of conventional engine is meant the ratio of combustion chamber volume when the volume of the cylinder on piston head top when piston is positioned at lower dead center and piston are positioned at top dead center.Compression ratio is the important design parameter of motor, and its size has material impact to engine cylinder internal combustion situation and combustion thermal efficiency, thereby the performance of motor is had material impact.Generally speaking, the motor that compression ratio is lower, it is soft to work, but power character is not strong, and oil consumption is also higher; The motor that compression ratio is higher, power character strengthens, and fuel consumption rate is lower.Cause pinking easily but compression ratio is too high, not only send sharp-pointed engine knock sound, and cause that power descends and oil consumption is risen, and the life-span of reduction motor.Therefore, various motors have all designed the proper compression ratio.
The compression ratio of general motor is immutable.Fixedly only in certain speed range " the best ", promptly the performances such as power character, rate of fuel consumption and work soften at this speed range intrinsic motivation reach best to the motor of compression ratio.If can be implemented in the interior alterable compression ratio of the speed range of motor, just might realize that engine performance all reaches best when various rotating speed.
The SVC motor of Sa Bo (Saab) company exploitation is to change the fuel consumption of compression ratio control motor.The core of its technology is exactly that the wedge type slide block is installed between cylinder body and cylinder cap, makes cylinder body and cylinder cap relative position change, and has changed the volume of firing chamber, thereby has changed compression ratio.Its compression ratio range can change between from 8.0 to 14.0.This motor is 1.6 liter of 5 Cylinder engine, peak output 166kw, and Maximum Torque 305N-m, comprehensive oil consumption has reduced about 30% than conventional engine.
Summary of the invention
In order to ensure realizing that under the non-detonating prerequisite of motor it can both reach optimum performance in whole speed range, the invention provides a kind of variable compression-ratio reciprocating piston engine, the present invention is simple in structure, is installed in the compression ratio that can change motor on the motor.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of variable compression-ratio reciprocating piston engine, this motor comprises primary clusterings such as bent axle, connecting rod, piston, cylinder head, cylinder block, and systems such as distribution device, supply, igniting, lubricated, cooling, starting form.Wherein, the piston that is installed in the cylinder block links to each other with bent axle by connecting rod, and described connecting rod is connected with eccentric lower bearing by eccentric top bearing shell with rod journal on the bent axle; A chute of processing and a shoulder hole that communicates with it on the balancer weight on the bent axle wherein, are installed centrifugal slider in the chute, centrifugal slider is connected by pull bar with eccentric lower bearing; The path of shoulder hole is partly installed the adjustment bolt, adjusts on the bolt locking nut is installed, and the large-diameter portion of shoulder hole divides installs return spring, and the two ends of return spring connect respectively adjusts bolt and centrifugal slider.
As preferred structure of the present invention, baffle plate and cover plate have been installed by the chute place of described crankshaft balance weight.
The invention has the beneficial effects as follows: this invention realizes the variation of stroke of piston by the rotation that is installed in eccentric top bearing shell on the rod journal and eccentric lower bearing, and then combustion chamber of air cylinder's volume is changed, and its compression ratio is changed.Engine speed is high more, and the angle that eccentric top bearing shell and eccentric lower bearing turn over is big more, and stroke of piston is big more, and combustion chamber volume is more little, and compression ratio is big more, has improved engine power performance and fuel economy.Of the present invention simple in structure, volume is little, and is in light weight.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is done explanation in further detail.
Fig. 1 is the plan view of variable compression-ratio reciprocating piston engine;
Fig. 2 is the side view of variable compression-ratio reciprocating piston engine;
Fig. 3 is the partial enlarged drawing of variable compression-ratio reciprocating piston engine;
Fig. 4 is the partial sectional view of the crankshaft balance weight of variable compression-ratio reciprocating piston engine;
Fig. 5 is a kind of design curve of compression ratio with rotation speed change.
Embodiment
The present invention relates to a kind of conventional engine that can change compression ratio.This motor is done slightly to change on the basis of general motor and is obtained, it is the eccentric bearing shell that the connecting rod bearing shell of common conventional engine is designed to the inside and outside circle decentraction, this off-centre bearing shell can turn over limited angle around the rod journal of bent axle, changed the length of crankshaft crank with this, promptly change stroke of piston, thereby changed compression ratio.
The piston rod group of motor is installed in the cylinder block by normal mode, bent axle also still is installed in the crankshaft main journal seat of correspondence at the bottom of the cylinder by crankshaft main journal, the distribution device of motor (comprising intake valve, exhaust valve, rocking arm, tappet, camshaft, cam timing gear etc.), fuel supply system (comprising fuel tank, oil pump, filter cleaner, oil pipe, air-strainer etc.), and other are kept the igniting system, cooling system, lubricating system, starting system of the normal operation of motor etc. and all remain unchanged.
As depicted in figs. 1 and 2, piston 1 links to each other with the rod journal 3 of bent axle by connecting rod 2.Be with two eccentric top bearing shells 9 and eccentric lower bearing 10 on the rod journal 3.In traditional motor, the inside and outside circle of two bearing shells is concentric, that is the attachment hole of connecting rod 2 is concentric with the rod journal 3 of bent axle.And eccentric top bearing shell 9 provided by the invention and eccentric lower bearing 10 formed cylindrical and interior round decentraction, there is a throw of eccentric in the center of circle of the two.Eccentric top bearing shell 9 and eccentric lower bearing 10 can be done the rotation of limited angle around rod journal 3, change the effective length of crankshaft crank with this.The middle part of eccentric top bearing shell 9 along the circumferential direction has elongated slot, passes through for lubricant oil.
Opposite direction at the rod journal 3 of bent axle is furnished with crankshaft balance weight 7.Side in crankshaft balance weight 7 is provided with chute, and centrifugal slider 5 is housed in chute.Between centrifugal slider 5 and eccentric lower bearing 10, link to each other by pull bar 4.When centrifugal slider 5 be subjected to action of centrifugal force along chute when slide in the outside of crankshaft balance weight 7, pull bar 4 eccentric top bearing shells 9 of pulling and eccentric lower bearing 10 rotate around rod journal 3.The rotation of eccentric top bearing shell 9 and eccentric lower bearing 10 makes the center of attachment hole of connecting rod 2 away from the center of rod journal 3, and the length of the crank that promptly extended has increased stroke of piston, has reduced combustion chamber volume, thereby has played the effect of increasing compression ratio.Engine speed is high more, and the centrifugal force that centrifugal slider 5 obtains is big more, and the distance that centrifugal slider 5 outwards slides is big more, and the angle that eccentric top bearing shell 9 and eccentric lower bearing 10 turn over is big more, and the stroke of piston increasing amount is big more, and the value added of compression ratio is also just big more.
Another side at bent axle is provided with the shoulder hole that communicates with chute, installs in it and adjusts bolt 11, as shown in Figure 4.The inner of adjusting bolt 11 connects return spring 8, and the other end of return spring 8 links to each other with centrifugal slider 5, and there is a locking nut 12 outer end of adjusting bolt 11.Rotate and adjust bolt 11, promptly adjusted the pretightening force of return spring 8.The size of pretightening force has determined the engine speed that centrifugal slider 5 begins to slide, thereby has also just determined the engine speed that compression ratio begins to change.When centrifugal slider 5 slides into the outermost end of chute, be subjected to stopping of catch 6, this moment, pull bar 4 eccentric top bearing shells 9 of pulling and eccentric lower bearing 10 turned over maximum angle, and the compression ratio of motor reaches maximum value.When engine speed continues to improve, compression ratio will no longer increase.
When engine rotation, eccentric top bearing shell 9 and eccentric lower bearing 10 inside and outside circles will be subjected to the opposite friction torque of direction.Two friction torque all are to change in the cycle, and the frequency of variation is directly proportional with engine speed.For reducing of the influence of frequency higher friction moment, cover plate 13 is set in the chute outer end to centrifugal slider 5 equilibrium positions.The dampening chamber that has formed the chute outer end by centrifugal slider 5, cover plate 13, baffle plate 6.The lubricant oil that splashes enters by the slit around the centrifugal slider 5 and is full of dampening chamber, stops centrifugal slider 5 not slide fast thus.
Motor is in running, the bent axle high speed rotating, the centrifugal slider 5 that is installed in crankshaft balance weight 7 slideways also rotates around crankshaft main journal, rotatablely move down at this, centrifugal slider 5 has produced away from the outside centrifugal force of crankshaft main journal, forces centrifugal slider 5 outwards to move, and centrifugal slider 5 drives pull bar 4 motions by pin, pull bar 4 orders about eccentric top bearing shell 9 by pin 14 again and eccentric lower bearing 10 rotates, as shown in Figure 3.The rotation of eccentric top bearing shell 9 and eccentric lower bearing 10 makes the distance at crank pin end pore center and crankshaft main journal center that change take place, just be equivalent to change the length of crank, make stroke of piston that variation take place, thereby changed combustion chamber volume, play the effect that changes compression ratio.
Eccentric top bearing shell 9 links to each other with the centrifugal slider of opening in the slideway of crankshaft balance weight 75 by pull bar 4 with eccentric lower bearing 10.When engine speed increased, centrifugal slider 5 eccentric top bearing shells 9 of pulling and eccentric lower bearing 10 rotated, and increase stroke of piston, increasing compression ratio, on the contrary reduce compression ratio.The return spring 8 and the adjustment bolt 11 that are installed in the shoulder hole make centrifugal slider 5, eccentric top bearing shell 9 and eccentric lower bearing 10 returns, and adjust the initial rotating speed that becomes compression ratio.Be arranged on the semiclosed dampening chamber in the crankshaft balance weight 7, slide block movement played damping function by lubricant oil.
Be example with certain 1.8 liter of 4 Cylinder engine below, its parameter is as follows:
Compression ratio ε=10; Cylinder bore φ=83mm; Stroke of piston S=83mm; Single cylinder swept volume V
g=449ml; Combustion chamber volume Vr=50ml; Eccentric bearing shell throw of eccentric: e=1.414mm; Rotatable angle: the θ of eccentric bearing shell=± 45 °, this angle is counted from middle position; But stroke of piston excursion: Δ S=± 1mm; Minimum compression ratio when stroke of piston reduces 1mm: ε
Min=8.9; Maximum compression ratio when stroke of piston increases 1mm: ε
Max=11.3.
Figure 5 shows that the design curve of the compression ratio of employing motor of the present invention with rotation speed change.Because engine knock mainly occurs in slow-speed of revolution section, so the rotating speed interval from the idling to 1500r/m is designed to minimum compression ratio, ε
Min=8.9; To the maximum speed interval, be designed to maximum compression ratio from 3000r/m, ε
Max=11.3; In 1500～3000r/m rotating speed interval is the compression ratio constant interval, and compression ratio increases with the rotating speed raising.
Claims (2)
1. variable compression-ratio reciprocating piston engine, this motor comprises connecting rod, cylinder head, cylinder block and distribution device, ignition system, lubrication system, cooling system and starting system, wherein, the piston (1) that is installed in the cylinder block links to each other with bent axle by connecting rod (2), it is characterized in that: described connecting rod (2) is connected with eccentric lower bearing (10) by eccentric top bearing shell (9) with rod journal (3) on the bent axle; Crankshaft balance weight on the bent axle (7) goes up a chute of processing and a shoulder hole that communicates with slideway, wherein, centrifugal slider (5) is installed in the chute, and centrifugal slider (5) is connected by pull bar (4) with eccentric lower bearing (10); The path of shoulder hole is partly installed and is adjusted bolt (11), adjusts bolt (11) and goes up installation locking nut (12), and the large-diameter portion of shoulder hole divides installs return spring (8), and the two ends of return spring (8) connect respectively adjusts bolt (11) and centrifugal slider (5).
2. variable compression-ratio reciprocating piston engine according to claim 1 is characterized in that: baffle plate (6) and cover plate (13) have been installed by the chute place of described crankshaft balance weight (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100555508A CN101333964B (en) | 2008-08-06 | 2008-08-06 | Variable compression-ratio reciprocating piston engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100555508A CN101333964B (en) | 2008-08-06 | 2008-08-06 | Variable compression-ratio reciprocating piston engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101333964A CN101333964A (en) | 2008-12-31 |
| CN101333964B true CN101333964B (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100555508A Expired - Fee Related CN101333964B (en) | 2008-08-06 | 2008-08-06 | Variable compression-ratio reciprocating piston engine |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655152B (en) * | 2009-06-10 | 2011-09-28 | 北京中清能发动机技术有限公司 | Single action piston for crank round sliding block mechanism as well as internal-combustion engine and compressor thereof |
| CN101858294A (en) * | 2010-04-14 | 2010-10-13 | 奇瑞汽车股份有限公司 | Engine with high compression ratio |
| CN102606675A (en) * | 2011-01-25 | 2012-07-25 | 朱譞晟 | Balance device of internal combustion engine |
| CN103244260B (en) | 2013-05-16 | 2015-09-23 | 沈大兹 | A kind of variable compression ratio and variable expansion compare device |
| WO2015196315A1 (en) * | 2014-06-27 | 2015-12-30 | 杨增利 | Method for enabling variable compression ratio and variable air-fuel ratio for internal combustion engine |
| CN109386380A (en) * | 2017-08-08 | 2019-02-26 | 罗灿 | Spline exports Ratios internal combustion engine |
| CN107725210A (en) * | 2017-11-24 | 2018-02-23 | 吉林大学 | A kind of variable-compression-ratio piston with restraining position ring block structure |
| DE102018123500A1 (en) * | 2018-09-25 | 2020-03-26 | Man Energy Solutions Se | Device and method for adjusting the length of a connecting rod of a cylinder of an internal combustion engine |
| CN112963243A (en) * | 2021-03-23 | 2021-06-15 | 一汽解放汽车有限公司 | Variable compression ratio mechanism of engine and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5562068A (en) * | 1994-07-13 | 1996-10-08 | Honda Giken Kogyo Kabushiki Kaisha | Compression ratio changing device in internal combustion engine |
| US6371062B1 (en) * | 2000-10-18 | 2002-04-16 | Ford Global Technologies, Inc. | Variable compression ratio connecting rods |
| CN2791279Y (en) * | 2003-08-05 | 2006-06-28 | 本田技研工业株式会社 | Variable compression ratio type engine |
| CN101109321A (en) * | 2007-08-08 | 2008-01-23 | 陈晨 | Self-adaption compression ratio variable engine |
-
2008
- 2008-08-06 CN CN2008100555508A patent/CN101333964B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5562068A (en) * | 1994-07-13 | 1996-10-08 | Honda Giken Kogyo Kabushiki Kaisha | Compression ratio changing device in internal combustion engine |
| US6371062B1 (en) * | 2000-10-18 | 2002-04-16 | Ford Global Technologies, Inc. | Variable compression ratio connecting rods |
| CN2791279Y (en) * | 2003-08-05 | 2006-06-28 | 本田技研工业株式会社 | Variable compression ratio type engine |
| CN101109321A (en) * | 2007-08-08 | 2008-01-23 | 陈晨 | Self-adaption compression ratio variable engine |
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| CN101333964A (en) | 2008-12-31 |
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Granted publication date: 20100609 Termination date: 20120806 |