CN103807013B - There is the energy-saving motor of variable compression ratio - Google Patents
There is the energy-saving motor of variable compression ratio Download PDFInfo
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- CN103807013B CN103807013B CN201410094141.4A CN201410094141A CN103807013B CN 103807013 B CN103807013 B CN 103807013B CN 201410094141 A CN201410094141 A CN 201410094141A CN 103807013 B CN103807013 B CN 103807013B
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Abstract
The invention discloses a kind of energy-saving motor with variable compression ratio, comprise cylinder body, cylinder barrel, cylinder head, valve mechanism cover, connecting rod, crank, crankshaft and piston, guiding device is provided with between cylinder head and cylinder body, guiding device comprises the guide rod being fixedly mounted on cylinder head bottom the right and left, the spring being fixedly mounted on the guide sleeve on cylinder body and being arranged on outside guide sleeve, guide rod and guide sleeve with the use of; Wherein: above cylinder head, be provided with a pressing device, pressing device comprises cam, upper runner, lower runner and tripod; An end points of tripod is arranged in valve mechanism cover, and two other end points installs runner and lower runner respectively; Upper runner contacts with cam, and lower runner contacts with the top of cylinder head.The output effect that the present invention has active force is good, and the volume of cylinder can realize the feature controlled, effect is high, easy to use.The present invention have design ingenious, manufacture advantage that is simple, Be very effective, be adapted at various vehicle and widely use.
Description
Technical field
The invention belongs to technical field of engines, particularly relate to a kind of energy-saving motor with variable compression ratio.
Background technique
At present, traditional four stroke engine mainly comprises cylinder, crank, piston and connecting rod, motor produces heat energy by the air in cylinder and oil firing, high temperature and high pressure gas acts on piston head, promotion piston does reciprocating linear motion, and piston acting promotes link motion, thus promotes crankshaft rotating acting, engine crank rotates 2 and once circulates with completing, and each circulation comprises suction stroke, compression stroke, expansion stroke and exhaust stroke.
When motor completes compression stroke, piston arrives top dead center, gas now during burning in cylinder has the highest swelling pressure, but because piston, connecting rod, crank and main journal can not form effective moment to the rotating center of bent axle nearly all point-blank, therefore cause the action effect of power during the highest swelling pressure poor, mechanical efficiency is lower.
The applicant's: Chinese patent: application number 201310076040.X, notification number CN103147855A, day for announcing 2013.06.12, a kind of energy-saving engine of this disclosure of the invention, comprise cylinder body, cylinder head, cylinder head cover, crank, connecting rod and piston, it is characterized in that: the center on cylinder head top is provided with groove, is provided with wheel in groove, wheel central hole is also connected with lateral pin by bearing, and lateral pin two ends are connected with inside groove; The top of wheel is provided with cam, and cam is fixedly connected on camshaft, and camshaft one end is provided with gear, and gear is driven by driving component by the crank gear of crank one end; The upper of cylinder head peripherally with under cylinder head cover is peripherally connected by upper rubber sleeve, is peripherally peripherally connected by lower rubber sleeve with the upper of cylinder body under cylinder head; Face, cylinder head lower-left and face, bottom right are arranged with two pins, and face, upper left and the upper right face of cylinder body are provided with the sleeve coordinated with pins slide, and the outside of pin and sleeve is overlapped and had spring.The not good effect of output of the active force of this invention, the volume of cylinder cannot realize controlling.
Summary of the invention
The object of the invention is to the deficiency for available engine, provide a kind of output effect of active force good, the volume of cylinder can realize the energy-saving motor with variable compression ratio controlled, effect is high, easy to use.
To achieve these goals, present invention employs following technological scheme:
There is an energy-saving motor for variable compression ratio, comprise cylinder body, cylinder barrel, cylinder head, valve mechanism cover, connecting rod, crank, crankshaft and piston; Be provided with guiding device between described cylinder head and cylinder body, described guiding device comprises the guide rod being fixedly mounted on cylinder head bottom the right and left, the spring being fixedly mounted on the guide sleeve on cylinder body and being arranged on outside guide sleeve; Described guide rod and guide sleeve with the use of; Wherein: above described cylinder head, be provided with a pressing device, described pressing device comprises cam, upper runner, lower runner and tripod; An end points of described tripod is arranged in valve mechanism cover, and two other end points installs runner and lower runner respectively; Described upper runner contacts with cam, and described lower runner contacts with the top of cylinder head; Described cam is arranged on camshaft; Described camshaft, bent axle are separately installed with camshaft sprocket, crankshaft sprocket, and camshaft sprocket is connected by chain with crankshaft sprocket.
In the present invention, by cam production cylinder head or cylinder head and cylinder barrel move up and down can change acting time cylinder barrel in combustion volume, the maximum firing pressure that burns instantaneously acts on the most appropriate position, can play a multiplier effect.By tripod, upper runner and lower runner are fixed, make, when upper runner is subject to knock over cam, left and right displacement occurs, can only move down, improve the stressing conditions of cylinder head.
Be provided with arrangements for speed regulation between above-described camshaft sprocket and crankshaft sprocket, described arrangements for speed regulation comprise motor, concentric cylinder gear, kinematic link and are arranged on the speed governing sprocket wheel at kinematic link two ends; Described concentric cylinder gear comprises small gear and gearwheel; Be provided with tooth at the intermediate portion of kinematic link, and be meshed with the small gear of concentric cylinder gear; The described gearwheel of concentric cylinder gear is meshed with the worm screw of motor; The chain that described speed governing sprocket wheel is connected with camshaft sprocket and crankshaft sprocket contacts, and makes chain be in the state of tightening up.
In the present invention, having set up arrangements for speed regulation just can the speed of regulating and controlling cam thus the volume realized when controlling cylinder acting, thus reaches energy-conservation effect.
When above-described cylinder barrel and cylinder body are fixedly installed togather, the intermediate portion of described cylinder head bottom is provided with toroidal lug boss, and lug boss embeds in cylinder barrel; Seal ring is provided with between lug boss and cylinder barrel.
Above-described cylinder barrel is fixedly connected with cylinder head, and cylinder barrel moves up and down together with cylinder head.
Above-described cylinder body and cylinder barrel tilting, make motor when entering expansion stroke, the piston in cylinder body and connecting rod are in center line coincidence status.
In the present invention, make motor in the moment entering expansion stroke, piston in cylinder body and connecting rod are in center line coincidence status, thus piston and connecting rod are in center line coincidence status when making motor the masterpiece that produces is used on piston when burning, the crunch that piston can be made to produce vertically acts on connecting rod, make connecting rod obtain larger power to promote bent axle acting, the power therefore more produced when the energy burning the same more strengthens, and reaches energy-conservation object.
The bottom sidewall of above-described cylinder body and cylinder barrel is provided with a breach, and the position of described breach is corresponding with the movement locus of connecting rod.
In the present invention, due to cylinder body and cylinder barrel banking, the bottom of cylinder body, cylinder barrel is while closer to connecting rod, another side is then away from connecting rod, so have a perpendicular rectangular openning in the bottom of cylinder body banking and cylinder barrel, can make connecting rod arrange, calm the anger stroke time can not encounter cylinder body and cylinder barrel, not only this rectangular openning can not affect the sealing of piston in the bottom of cylinder body and cylinder barrel but also connecting rod can be allowed to pass through smoothly.
The upper of the above cylinder head peripherally with under cylinder head cover is peripherally connected by telescopic upper rubber sleeve, is peripherally peripherally connected by telescopic lower rubber sleeve with the upper of cylinder body under cylinder head.
The connection of cylinder head and cylinder body and cylinder head cover can not be had influence in the process that cylinder head moves up and down.
Working principle:
By crank rotation, drive crankshaft gear, rotated by chain-driving camshaft gear wheel, cam axle band moving cam is rotated, and bent axle takes two turns, cam turns around, namely motor completes four strokes, cam revolves and turns around, its transmission principle and crankshaft gear drive intake cam shaftgear and exhaust cam shaftgear, to rotate to drive admission cam shaft and exhaust cam shaft thus to complete intake cam identical with the spinning movement of exhaust cam, and by being located at the arrangements for speed regulation in the middle of crankshaft gear and camshaft gear wheel, can chain be adjusted thus reach adjustment camshaft gear wheel and reach adjustment cam speed, and finally reach the volume of adjustment cylinder, thus reach the target of the effect changing the acting of cylinder expansion stroke according to different road conditions.
Beneficial effect of the present invention:
1, cylinder body of the present invention and cylinder head, cylinder barrel etc. adopt setting banking, the pressure maximum that instancy of combustion is produced act on piston with on the same shaft axis of connecting rod time (piston is parallel with connecting rod solid), the crunch that piston can be made to produce vertically acts on connecting rod, makes connecting rod obtain larger power and carrys out throw crank acting; Due to cylinder body and cylinder barrel banking, the bottom of cylinder body, cylinder barrel is while closer to connecting rod, another side is then away from connecting rod, so have a perpendicular rectangular openning in the bottom of cylinder body banking and cylinder barrel, can make connecting rod arrange, calm the anger stroke time can not encounter cylinder body and cylinder barrel, not only this rectangular openning can not affect the sealing of piston in the bottom of cylinder body and cylinder barrel but also connecting rod can be allowed to pass through smoothly.
2, the present invention adopts and be provided with pressing device above cylinder cap, make cylinder cap or cylinder cap and cylinder barrel energy up and down, thus make to obtain at the volley larger, the maximum firing pressure of instancy of combustion acts on the most appropriate position, can play a multiplier effect, upper runner runs on the convex surface of cam, so when piston runs down to lower dead center, cylinder head or cylinder head and cylinder barrel all as you were at same position, go up runner subsequently and the inclined-plane along cam is run to curved surface, and spring is with by cylinder head or cylinder head and cylinder barrel upwards jack-up playback, enter lower one-stroke immediately.Cylinder head always bob when motor runs, so suction port is connected with suction tude and outlet pipe one changeover portion with relief opening, this changeover portion can along with the bob elongation of cylinder head or contraction; Control actuating motor by vehicle-mounted computer according to different road conditions simultaneously, actuating motor controls the rotational velocity of cam again, control the time that cylinder head or cylinder head and cylinder barrel move up and down, thus reach the volume of control combustion moment cylinder operation, make the effect that working efficiency reaches optimum, the effect of energy saving.
3, the present invention have design ingenious, manufacture advantage that is simple, Be very effective, be adapted at various vehicle and use.
Accompanying drawing explanation
Accompanying drawing 1 is the integral cylinder head assembly structure cross-sectional schematic of embodiment;
Accompanying drawing 2 is split type cylinder cap assembly structure cross-sectional schematic of embodiment;
Accompanying drawing 3 is structural representations of the left view of embodiment;
Accompanying drawing 4 is structural representations of the control transmission of embodiment.
Identify in figure: cylinder body-1, cylinder barrel-2, piston-3, guiding device-4, lower rubber sleeve-5, cylinder head-6, upper rubber sleeve-7, intake cam-8, tripod-9, lower runner-10, upper runner-11, cylinder head cover-12, cam-13, camshaft-14, exhaust cam-15, seal ring-16, connecting rod-17, crank-18, bent axle-19, crankshaft sprocket-20, chain-21, speed governing sprocket wheel-22, kinematic link-23, camshaft sprocket-24, exhaust sprocket-25, air inlet sprocket wheel-26, worm screw-27, gearwheel-28, small gear-29.
Embodiment
With reference to the accompanying drawings, the specific embodiment of the present invention is further described in detail.
Embodiment 1:
A kind of energy-saving motor with variable compression ratio, comprise cylinder body 1, cylinder barrel 2, cylinder head 6, valve mechanism cover, connecting rod 17, crank 18, bent axle 19 and piston 3, cylinder barrel 2 and cylinder body 1 are fixedly installed togather, the intermediate portion of cylinder head 6 bottom is provided with toroidal lug boss, lug boss embeds in cylinder barrel 2, is provided with seal ring 16 between lug boss and cylinder barrel 2; Cylinder body 1 is tilting with cylinder barrel 2, makes motor when doing work, and the piston 3 in cylinder body 1 is in center line coincidence status with connecting rod 17, and the bottom sidewall of cylinder body 1 and cylinder barrel 2 is provided with a breach, and the position of breach is corresponding with the movement locus of connecting rod 17; The upper of cylinder head 6 is peripherally peripherally connected by telescopic upper rubber sleeve 7 for 12 times with cylinder head cover, and cylinder head is peripherally peripherally connected by telescopic lower rubber sleeve 5 with the upper of cylinder body 1 for 6 times.Be provided with guiding device between cylinder head 6 and cylinder body 1, guiding device comprises the guide rod being fixedly mounted on cylinder head 6 bottom the right and left, the spring being fixedly mounted on the guide sleeve on cylinder body 1 and being arranged on outside guide sleeve, guide rod and guide sleeve with the use of, a pressing device is provided with above cylinder head 6, pressing device comprises cam 13, upper runner 11, lower runner 10 and tripod 9, an end points of tripod 9 is arranged in valve mechanism cover, two other end points installs runner 11 and lower runner 10 respectively, upper runner 11 contacts with cam 13, lower runner 10 contacts with the top of cylinder head 6, cam 13 is arranged on camshaft 14, camshaft 14, bent axle 19 is separately installed with camshaft sprocket 24, crankshaft sprocket 20, and camshaft sprocket 24 is connected by chain 21 with crankshaft sprocket 20, arrangements for speed regulation are provided with between camshaft sprocket 24 and crankshaft sprocket 20, arrangements for speed regulation comprise motor, concentric cylinder gear (comprising small gear 29 and gearwheel 28), vehicle-mounted computer, kinematic link 23 and the speed governing sprocket wheel 22 being arranged on kinematic link 23 two ends, tooth is provided with at the intermediate portion of kinematic link 23, motor is actuating motor, actuating motor connects vehicle-mounted computer, and be meshed with the small gear 29 of concentric cylinder gear, the gearwheel 28 of concentric cylinder gear is meshed with the worm screw 27 of motor, and the chain 21 that speed governing sprocket wheel 22 is connected with camshaft sprocket 24 and crankshaft sprocket 20 contacts, and makes chain 21 be in the state of tightening up.
Embodiment 2:
A kind of energy-saving motor with variable compression ratio, comprise cylinder body 1, cylinder barrel 2, cylinder head 6, valve mechanism cover, connecting rod 17, crank 18, bent axle 19 and piston 3, cylinder barrel 2 is fixedly connected with cylinder head 6, and cylinder barrel 2 moves up and down together with cylinder head 6, and cylinder body 1 is tilting with cylinder barrel 2; Cylinder body 1 is tilting with cylinder barrel 2, makes motor when doing work, and the piston 3 in cylinder body 1 is in center line coincidence status with connecting rod 17, and the bottom sidewall of cylinder body 1 and cylinder barrel 2 is provided with a breach, and the position of breach is corresponding with the movement locus of connecting rod 17; The upper of cylinder head 6 is peripherally peripherally connected by telescopic upper rubber sleeve 7 for 12 times with cylinder head cover, and cylinder head is peripherally peripherally connected by telescopic lower rubber sleeve 5 with the upper of cylinder body 1 for 6 times.Be provided with guiding device between cylinder head 6 and cylinder body 1, guiding device comprises the guide rod being fixedly mounted on cylinder head 6 bottom the right and left, the spring being fixedly mounted on the guide sleeve on cylinder body 1 and being arranged on outside guide sleeve, guide rod and guide sleeve with the use of, a pressing device is provided with above cylinder head 6, pressing device comprises cam 13, upper runner 11, lower runner 10 and tripod 9, an end points of tripod 9 is arranged in valve mechanism cover, two other end points installs runner 11 and lower runner 10 respectively, upper runner 11 contacts with cam 13, lower runner 10 contacts with the top of cylinder head 6, cam 13 is arranged on camshaft 14, camshaft 14, bent axle 19 is separately installed with camshaft sprocket 24, crankshaft sprocket 20, and camshaft sprocket 24 is connected by chain 21 with crankshaft sprocket 20, arrangements for speed regulation are provided with between camshaft sprocket 24 and crankshaft sprocket 20, arrangements for speed regulation comprise motor, concentric cylinder gear (comprising small gear 29 and gearwheel 28), vehicle-mounted computer, kinematic link 23 and the speed governing sprocket wheel 22 being arranged on kinematic link 23 two ends, tooth is provided with at the intermediate portion of kinematic link 23, motor is actuating motor, actuating motor connects vehicle-mounted computer, and be meshed with the small gear 29 of concentric cylinder gear, the gearwheel 28 of concentric cylinder gear is meshed with the worm screw 27 of motor, and the chain 21 that speed governing sprocket wheel 22 is connected with camshaft sprocket 24 and crankshaft sprocket 20 contacts, and makes chain 21 be in the state of tightening up.
During work:
Aspirating stroke: intake cam 8 promotes IO Intake Valve Opens, gas enters from suction port, piston 3 moves to lower dead center suction gas from top dead center, the bump of this one-stroke cam 13 is rotated in the upside of cam 13, cylinder head 6 does not change, so the control of intake cam 8 pairs of intake valves is unaffected with the relative position of intake cam 8.
Compression stroke: IC Intake Valve Closes, piston 3 moves to top dead center from lower dead center, and the bump of this one-stroke cam 13 is rotated in the right side of cam 13.
Expansion stroke: piston 3 moves downward from top dead center, when the bump arc-shaped side of cam 13 just rotates to runner, bump promotes runner downwards, cylinder head 6 or cylinder head 6 and cylinder barrel 2 are moved downward, air in cylinder barrel 2 is reached the requirement of oil spout or igniting by the pressure and temperature compressed, now igniting or spray pool, the maximum pressure that instancy of combustion produces acts on by handle, on piston 3 and the same line of connecting rod 17, again because connecting rod 17 is not with by handle point-blank, and shape has a certain degree, more effective moment can be formed, the transmission of exerting all one's strength is more scientific, piston 3 continues to run down to lower dead center, in this process, the bump of cam 13 still rotates on wheel, also mean that cylinder head 6 does not have change at same position in this course.Meanwhile, vehicle-mounted computer can control actuating motor according to different road conditions, thus allows kinematic link 23 move left and right, and reaches and controls cam 13 rotating speed, controls the volume size of cylinder during expansion stroke, finally reaches energy-conservation effect.
Exhaust stroke: piston 3 moves from lower dead center to top dead center, the bump of cam 13 oneself rotate on the left of it, cylinder head 6 and cylinder barrel 2 reset under the action of the spring, and upper rubber sleeve 7 upwards compresses, exhaust cam 15 promotes exhaust valve and opens, and remainder of exhaust gas is discharged from relief opening.
Above-described embodiment, just one of more preferably concrete mode of the present invention, the usual change that those skilled in the art carry out within the scope of technical solution of the present invention and replacement all should be included in protection scope of the present invention.
Claims (7)
1. there is an energy-saving motor for variable compression ratio, comprise cylinder body (1), cylinder barrel (2), cylinder head (6), valve mechanism cover (12), connecting rod (17), crank (18), bent axle (19) and piston (3); Be provided with guiding device between described cylinder head (6) and cylinder body (1), described guiding device comprises the guide rod being fixedly mounted on cylinder head (6) bottom the right and left, the spring being fixedly mounted on the guide sleeve on cylinder body (1) and being arranged on outside guide sleeve; Described guide rod and guide sleeve with the use of; It is characterized in that: described cylinder head (6) top is provided with a pressing device, and described pressing device comprises cam (13), upper runner (11), lower runner (10) and tripod (9); An end points of described tripod (9) is arranged in valve mechanism cover, and two other end points installs runner (11) and lower runner (10) respectively; Described upper runner (11) contacts with cam (13), and described lower runner (10) contacts with the top of cylinder head (6); Described cam (13) is arranged on camshaft (14); Described camshaft (14), bent axle (19) are separately installed with camshaft sprocket (24), crankshaft sprocket (20), and camshaft sprocket (24) is connected by chain (21) with crankshaft sprocket (20).
2. the energy-saving motor with variable compression ratio according to claim 1, it is characterized in that: be provided with arrangements for speed regulation between described camshaft sprocket (24) and crankshaft sprocket (20), described arrangements for speed regulation comprise motor, concentric cylinder gear, kinematic link (23) and are arranged on the speed governing sprocket wheel (22) at kinematic link (23) two ends; Described concentric cylinder gear comprises small gear (29) and gearwheel (28); Be provided with tooth at the intermediate portion of kinematic link (23), and be meshed with the small gear (29) of concentric cylinder gear; The gearwheel (28) of described concentric cylinder gear is meshed with the worm screw (27) of motor; The chain (21) that described speed governing sprocket wheel (22) is connected with camshaft sprocket (24) and crankshaft sprocket (20) contacts, and makes chain (21) be in the state of tightening up.
3. the energy-saving motor with variable compression ratio according to claim 1 and 2, it is characterized in that: when described cylinder barrel (2) and cylinder body (1) are fixedly installed togather, the intermediate portion of described cylinder head (6) bottom is provided with toroidal lug boss, and lug boss embeds in cylinder barrel (2); Seal ring (16) is provided with between lug boss and cylinder barrel (2).
4. the energy-saving motor with variable compression ratio according to claim 1 and 2, is characterized in that: described cylinder barrel (2) is fixedly connected with cylinder head (6), and cylinder barrel (2) moves up and down together with cylinder head (6).
5. the energy-saving motor with variable compression ratio according to claim 1 and 2, it is characterized in that: described cylinder body (1) is tilting with cylinder barrel (2), make motor when entering expansion stroke, the piston (3) in cylinder body (1) and connecting rod (17) are in center line coincidence status.
6. the energy-saving motor with variable compression ratio according to claim 5, is characterized in that: described cylinder body (1) and the bottom sidewall of cylinder barrel (2) are provided with a breach, and the position of described breach is corresponding with the movement locus of connecting rod (17).
7. the energy-saving motor with variable compression ratio according to claim 1, it is characterized in that: the upper of described cylinder head (6) peripherally with under cylinder head cover (12) is peripherally connected by telescopic upper rubber sleeve (7), be peripherally peripherally connected by telescopic lower rubber sleeve (5) with the upper of cylinder body (1) under cylinder head (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410094141.4A CN103807013B (en) | 2014-03-13 | 2014-03-13 | There is the energy-saving motor of variable compression ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410094141.4A CN103807013B (en) | 2014-03-13 | 2014-03-13 | There is the energy-saving motor of variable compression ratio |
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| Publication Number | Publication Date |
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| CN103807013A CN103807013A (en) | 2014-05-21 |
| CN103807013B true CN103807013B (en) | 2016-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410094141.4A Active CN103807013B (en) | 2014-03-13 | 2014-03-13 | There is the energy-saving motor of variable compression ratio |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105937442A (en) * | 2015-12-21 | 2016-09-14 | 宁波星豪汽车维修有限公司 | Internal combustion engine compression ratio adjusting system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR339202A (en) * | 1903-12-02 | 1905-01-05 | Henri Joseph Burtart | Improvements to internal combustion engines |
| FR1114451A (en) * | 1954-04-17 | 1956-04-12 | Lohmann Werke Ag | Internal combustion engine arranged for mixture compression and auto-ignition |
| DE202010001019U1 (en) * | 2009-12-18 | 2010-04-15 | HIMBERT, Jürgen | Internal combustion engine with electrically adjustable compression |
| CN103114908A (en) * | 2013-03-11 | 2013-05-22 | 范伟俊 | Engine with compression ratios variable |
| CN203822474U (en) * | 2014-03-13 | 2014-09-10 | 范伟俊 | Energy-saving engine with variable compression ratio |
-
2014
- 2014-03-13 CN CN201410094141.4A patent/CN103807013B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR339202A (en) * | 1903-12-02 | 1905-01-05 | Henri Joseph Burtart | Improvements to internal combustion engines |
| FR1114451A (en) * | 1954-04-17 | 1956-04-12 | Lohmann Werke Ag | Internal combustion engine arranged for mixture compression and auto-ignition |
| DE202010001019U1 (en) * | 2009-12-18 | 2010-04-15 | HIMBERT, Jürgen | Internal combustion engine with electrically adjustable compression |
| CN103114908A (en) * | 2013-03-11 | 2013-05-22 | 范伟俊 | Engine with compression ratios variable |
| CN203822474U (en) * | 2014-03-13 | 2014-09-10 | 范伟俊 | Energy-saving engine with variable compression ratio |
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