CN102297029B - Piston variable compression ratio device in internal-combustion engine - Google Patents
Piston variable compression ratio device in internal-combustion engine Download PDFInfo
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- CN102297029B CN102297029B CN201110254668.5A CN201110254668A CN102297029B CN 102297029 B CN102297029 B CN 102297029B CN 201110254668 A CN201110254668 A CN 201110254668A CN 102297029 B CN102297029 B CN 102297029B
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Abstract
The invention provides a piston variable compression ratio device in an internal-combustion engine, and belongs to the technical field of automobiles. The device solves the problem of inaccurate adjustment and high manufacturing requirement of the piston variable compression ratio device in the conventional internal-combustion engine. The piston variable compression ratio device in the internal-combustion engine comprises a box; a crank, a middle lever, a connecting arm and a connecting rod are arranged in the box; one end of the middle lever is hinged to the box, and the other end of the middle lever is hinged with the connecting rod; the connecting rod is connected with a piston of the internal-combustion engine; one end of the connecting arm is hinged to the crack, and the other end of the connecting arm is hinged to the middle lever; and an adjustor capable of adjusting the swing radian of the middle lever is arranged between the crank and the connecting arm. The piston variable compression ratio device in the internal-combustion engine has the advantages of accuracy in adjusting the compression ratio, stability in operation and low friction between the piston and a cylinder.
Description
Technical field
The invention belongs to automobile technical field, relate to a kind of internal-combustion engine, particularly a kind of piston variable compression ratio device in internal-combustion engine.
Background technique
Internal-combustion engine, is a kind of dynamic power machine, and it is by fuel is burnt at machine intimate, and the heat energy of being put is directly converted to the heat engine of power.
Sensu lato internal-combustion engine not only comprises stroke piston combustion engine, rotary engine and free piston engine, also comprise the wheeled gas turbine of pivoting leaf, jet engine etc., but usually said internal-combustion engine refers to internal-combustion piston engine, internal-combustion piston engine is the most general with reciprocating piston type.Internal-combustion piston engine mixes fuel and air, in its cylinder combustion, burns, and the heat energy discharging makes to produce in cylinder the combustion gas of High Temperature High Pressure.Combustion gas is expanded and is promoted piston work done, then by connecting rod or other mechanisms, mechanical work is exported, and drives follower work.But because the combustion process of fuel in cylinder and the compression ratio of fuel and air are contacted directly, when the stroke of piston in cylinder is constant, fuel in cylinder and the compression ratio of air are fixed value, make motor be output as fixing power, when at low load working condition, also export the power of exporting when high loading, increased undoubtedly unnecessary oil consumption.
For this situation, people have recognized this deficiency, and carry out improvement, a kind of energy-saving IC engine [application number: 200520083693.1 openly proposing as Chinese patent literature data; Notice of authorization number: CN2797653Y], comprising inner carrier and be arranged on the connecting rod on inner carrier, between inner carrier and outer piston with expansion chamber, between inner carrier and outer piston with adjustable compression ratio of internal-combustion engine device.Adjustable compression ratio of internal-combustion engine device is by inputting oil duct and limiting mechanism of pressure forms, limiting mechanism of pressure is positioned at the wall of inner carrier or outer piston, input oil duct is positioned at the wall of inner carrier, it is connected ring shaped oil passage with expansion chamber, ring shaped oil passage is the annular groove that leave inner carrier outer surface and corresponding section, wrist pin inner chamber position, in input oil duct, there is one-way valve, limiting mechanism of pressure comprises the pressure limiting ball in pressure limiting chamber and pressure limiting chamber, pressure limiting spring and adjusting screw, top, pressure limiting chamber is connected with expansion chamber by through hole, bottom, pressure limiting chamber is by the pressure adjusting bolt shutoff with through hole, pressure limiting spring lower edge is bearing in pressure adjusting bolt, pressure limiting ball is by pressure limiting spring-loaded the through hole pressurize shutoff to top, pressure limiting chamber.But the move place of outer piston, makes piston have different top dead centers in adopting, thereby change the compression ratio of fuel and air, because the move place of interior outer piston is not easy to regulate comparatively accurately; Due to the mode of outer piston in piston employing, therefore the coaxality of inner carrier, outer piston and cylinder is had relatively high expectations, increased undoubtedly manufacture cost.
Summary of the invention
The object of the invention is to have the problems referred to above for existing technology, proposed a kind of adjusting comparatively accurately and the relatively low piston variable compression ratio device in internal-combustion engine of manufacture cost.
Object of the present invention can realize by following technical proposal: a kind of piston variable compression ratio device in internal-combustion engine, comprise a casing, in described casing, be provided with crank, middle lever, link arm, connecting rod, in the middle of described, lever one end is hinged on casing, the other end and the rod hinge connection of middle lever, connecting rod is connected with the piston of internal-combustion engine, one end of described link arm is hinged on crank, in the middle of being hinged on, the other end of described link arm on lever, between described crank and link arm, there is the adjusting element of lever swing radian in the middle of adjusting.
When work, fuel and air in the piston countercylinder of internal-combustion engine compress, when fuel and air pressure contract light after promotion piston down move, because piston is connected with connecting rod, the middle lever that connecting rod and one end are hinged on casing is hinged, and therefore piston down moves and drives intermediate connecting rod to lower swing.Because middle lever middle part is hinged with one end of link arm, the other end of link arm is hinged with crank, and therefore, intermediate connecting rod drives crank-swinging to lower swing; When after fuel combustion, while carrying out exhaust, on piston, move, by connecting rod, middle lever and link arm drive crank-swinging; Above-mentioned crank-swinging drives the bent axle being connected with crank to rotate, thereby the energy of the burning of fuel is transmitted on bent axle.In the middle of adopting, the swing of lever and link arm transfers energy on crank, makes pistons work comparatively steady.While needing regulating power when in different operating mode, by regulating adjusting element, the oscillator arc of lever in the middle of adjusting, make the stop up and down of piston that change occur, thereby changed the discharge capacity of compression ratio and the waste gas of fuel and air, thereby reduced oil consumption, improved the combustion efficiency of motor and the performance of motor.
In above-mentioned piston variable compression ratio device in internal-combustion engine, on described crank, there is coupling shaft, one end of above-mentioned link arm has attachment hole, and described coupling shaft is positioned at the connection hole of above-mentioned link arm.By the coupling shaft of crank and the attachment hole of link arm, coordinate, crank is connected with link arm, have advantages of simple in structure, easy to connect.
In above-mentioned piston variable compression ratio device in internal-combustion engine, described adjusting element is the eccentric wheel on coupling shaft, and the attachment hole of above-mentioned link arm is enclosed within on eccentric wheel.Because the attachment hole of link arm is enclosed within on eccentric wheel, when eccentric wheel rotates, make the radius of crank that change occur, thereby changed the amplitude of fluctuation of middle lever, reach the stop up and down that changes piston, thereby changed the compression ratio of piston to fuel and air.
In above-mentioned piston variable compression ratio device in internal-combustion engine, described adjusting element also comprises the adjustable lever that is positioned at coupling shaft sidepiece, and rotates when adjustable lever rotational drives above-mentioned coupling shaft.When needs regulate, by rotary regulating lever, thereby realize coupling shaft, rotate.
In above-mentioned piston variable compression ratio device in internal-combustion engine, on described adjustable lever, there is driving gear, on described coupling shaft, there is driven gear and driven gear and engage with driving gear.By the engagement driving of driving gear and driven gear, adjustable lever drives coupling shaft to rotate, there is transmission efficiency high, transmission is advantage accurately, can pass through rotation angle and the direction of adjusting gear, the stop up and down of regulating piston exactly, thus the compression ratio of fuel and air can be controlled comparatively accurately.
In above-mentioned piston variable compression ratio device in internal-combustion engine, described coupling shaft is axially connected on crank.
Compared with prior art, this piston variable compression ratio device in internal-combustion engine has the following advantages:
1,, by controlling the engagement driving of driving gear and driven gear, the rotation angle of eccentric adjustment wheel reaches the stop up and down of regulating piston, has its compression ratio of adjusting advantage comparatively accurately;
2, by the swing of middle lever and link arm, transfer energy on crank, make pistons work comparatively steady;
3, link arm pivot angle is less than the internal combustion (IC) engine link rod pivot angle of same cylinder diameter, discharge capacity, and side pressure of piston is little, reduces the friction between piston and cylinder.
Accompanying drawing explanation
Fig. 1 is the partial sectional view of this piston variable compression ratio device in internal-combustion engine.
Fig. 2 is the assembling schematic diagram of this piston variable compression ratio device in internal-combustion engine.
In figure, 1, casing; 2, crank; 3, middle lever; 4, link arm; 4a, attachment hole; 5, connecting rod; 6, adjusting element; 6a, eccentric wheel; 6b, adjustable lever; 6c, driving gear; 7, coupling shaft; 7a, driven gear.
Embodiment
Be below specific embodiments of the invention by reference to the accompanying drawings, technological scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As illustrated in fig. 1 and 2, a kind of piston variable compression ratio device in internal-combustion engine, comprise a casing 1, in casing 1, be provided with crank 2, middle lever 3, connecting rod 5, middle lever 3 one end are hinged on casing 1, and the other end of middle lever 3 and connecting rod 5 are hinged, connecting rod 5 is connected with the piston of internal-combustion engine, link arm 4 one end are hinged on the middle part of crank 2, and lever 3 middle parts in the middle of the other end of link arm 4 is hinged on, have the adjusting element 6 that can adjust middle lever 3 oscillator arcs between crank 2 and link arm 4.On crank 2, be axially fixed with coupling shaft 7, one end of link arm 4 has attachment hole 4a, and coupling shaft 7 is positioned at the attachment hole 4a place of link arm 4.Adjusting element 6 is the eccentric wheel 6a on coupling shaft 7, and the attachment hole 4a of link arm 4 is enclosed within on eccentric wheel 6a; Adjusting element 6 also comprises the adjustable lever 6b that is positioned at coupling shaft 7 sidepieces, when the rotation of adjustable lever 6b rotational drive coupling shaft 7.On adjustable lever 6b, there is driving gear 6c, on coupling shaft 7, there is driven gear 7a and driven gear 7a and engage with driving gear 6c.
When work, fuel and air in the piston countercylinder of internal-combustion engine compress, when fuel and air pressure contract light after promotion piston down move, because piston is connected with connecting rod 5, connecting rod 5 is hinged with the middle lever 3 that one end is hinged on casing 1, and therefore piston down moves and drives intermediate connecting rod 5 to lower swing.Because one end of middle lever 3 middle parts and link arm 4 is hinged, the other end of link arm 4 is hinged with crank 2, and therefore, intermediate connecting rod 5 drives crank 2 to swing to lower swing; When after fuel combustion, while carrying out exhaust, on piston, move, by connecting rod 5, middle lever 3 and link arm 4 drive crank 2 to swing; Crank 2 swings and drives the bent axle being connected with crank 2 to rotate, thereby the energy of the burning of fuel is transmitted on bent axle.
While needing regulating power when in different operating mode, by engaging of driving gear 6c and driven gear 7a, adjustable lever 6b rotates and drives coupling shaft 7 to rotate, because the attachment hole 4a of link arm 4 is enclosed within on eccentric wheel 6a, when eccentric wheel 6a rotates, make the radius of crank 2 that change occur, thereby changed the amplitude of fluctuation of middle lever 3, reach the stop up and down that changes piston, thereby changed the compression ratio of piston to fuel and air.The angle stop up and down of control piston comparatively accurately that regulating and controlling bar 6b rotates, thus the compression ratio of fuel and air can be controlled comparatively accurately.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although more used the terms such as casing 1, crank 2, middle lever 3, link arm 4, attachment hole 4a, connecting rod 5, adjusting element 6, eccentric wheel 6a, adjustable lever 6b, driving gear 6c, coupling shaft 7, driven gear 7a herein, do not got rid of the possibility of using other term.Use these terms to be only used to describe more easily and explain essence of the present invention; They are construed to any additional restriction is all contrary with spirit of the present invention.
Claims (4)
1. a piston variable compression ratio device in internal-combustion engine, comprise a casing (1), it is characterized in that, in described casing (1), be provided with crank (2), middle lever (3), link arm (4), connecting rod (5), in the middle of described, lever (3) one end is hinged on casing (1), the other end and the connecting rod (5) of middle lever (3) are hinged, connecting rod (5) is connected with the piston of internal-combustion engine, one end of described link arm (4) is hinged on crank (2), the other end of link arm (4) is hinged on the middle part of middle lever (3), between described crank (2) and link arm (4), there is the adjusting element (6) of lever (3) oscillator arc in the middle of adjusting, on described crank (2), there is coupling shaft (7), one end of above-mentioned link arm (4) has attachment hole (4a), described coupling shaft (7) is positioned at the attachment hole (4a) of above-mentioned link arm (4) and locates, described adjusting element (6) is the eccentric wheel (6a) on coupling shaft (7), the attachment hole (4a) of above-mentioned link arm (4) is enclosed within on eccentric wheel (6a).
2. piston variable compression ratio device in internal-combustion engine according to claim 1, it is characterized in that, described adjusting element (6) also comprises the adjustable lever (6b) that is positioned at coupling shaft (7) sidepiece, and rotates when adjustable lever (6b) rotational drives above-mentioned coupling shaft (7).
3. piston variable compression ratio device in internal-combustion engine according to claim 2, it is characterized in that, on described adjustable lever (6b), there is driving gear (6c), on described coupling shaft (7), there is driven gear (7a) and driven gear (7a) and engage with driving gear (6c).
4. according to the piston variable compression ratio device in internal-combustion engine described in claim 1 or 2 or 3, it is characterized in that, described coupling shaft (7) is axially connected on crank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110254668.5A CN102297029B (en) | 2011-08-31 | 2011-08-31 | Piston variable compression ratio device in internal-combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110254668.5A CN102297029B (en) | 2011-08-31 | 2011-08-31 | Piston variable compression ratio device in internal-combustion engine |
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| CN102297029A CN102297029A (en) | 2011-12-28 |
| CN102297029B true CN102297029B (en) | 2014-04-16 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110657024A (en) * | 2018-12-30 | 2020-01-07 | 长城汽车股份有限公司 | Variable compression ratio mechanism and engine |
| CN110671199B (en) * | 2018-12-30 | 2021-07-06 | 长城汽车股份有限公司 | Variable compression ratio mechanism and engine |
| CN112855357B (en) * | 2021-01-24 | 2023-04-18 | 效俊林 | Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4538557A (en) * | 1983-03-24 | 1985-09-03 | Kleiner Rudolph R | Internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0340213A4 (en) * | 1986-09-01 | 1990-09-05 | Leonhard Johann Gerhard Pal | Internal combustion engine variable stroke mechanism |
| JP2002349303A (en) * | 2001-05-28 | 2002-12-04 | Honda Motor Co Ltd | Four-cycle engine |
| JP2007285132A (en) * | 2006-04-12 | 2007-11-01 | Toyota Central Res & Dev Lab Inc | Variable compression ratio type internal combustion engine |
| JP4922122B2 (en) * | 2007-10-11 | 2012-04-25 | 本田技研工業株式会社 | Variable stroke engine |
| CN101403342B (en) * | 2008-05-13 | 2012-06-27 | 奇瑞汽车股份有限公司 | Engine with variable compression ratio |
| KR101020826B1 (en) * | 2008-12-02 | 2011-03-09 | 현대자동차주식회사 | Variable compression ratio apparatus |
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- 2011-08-31 CN CN201110254668.5A patent/CN102297029B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4538557A (en) * | 1983-03-24 | 1985-09-03 | Kleiner Rudolph R | Internal combustion engine |
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