CN102926828B - Full variable valve stroke mechanism - Google Patents
Full variable valve stroke mechanism Download PDFInfo
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- CN102926828B CN102926828B CN201210501842.6A CN201210501842A CN102926828B CN 102926828 B CN102926828 B CN 102926828B CN 201210501842 A CN201210501842 A CN 201210501842A CN 102926828 B CN102926828 B CN 102926828B
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Abstract
The invention discloses a tappet and a full variable valve stroke mechanism using the same. The tappet is characterized in that an elastic assembly is arranged between a base of the tappet and an adjusting piston, a tappet cover covers the adjusting piston, an adjusting cam is arranged between the tappet cover and the adjusting piston, and the tappet cover of the tappet is directly or indirectly contacted with an air valve. Compared with the prior art, the length of the tappet provided by the invention can be adjusted according to actual requirements, and the variable valve stroke mechanism can realize full-continuous control.
Description
Technical field
The invention belongs to technical field of engines, be specifically related to a kind of variable air valve lift range mechanism.
Background technique
Traditional petrolic valve lift is fixing immutable.Namely the cam profile of engine cam only has one.This just causes this lift can not make motor all obtain best charge flow value in high load region and low load region, obtains good power character and Economy.The valve lift of conventional gasoline machine motor---design of cam contour line is to motor under full working scope, and the balance according to comprehensive evaluation index is selected.Consequently motor or meet the best fuel consumption rate of low-load, or the output torque of the best meeting high load, you can't have both at the same time.
The employing of variable air valve lift range mechanism, makes motor can be met the valve lift of demand in high load region and low load region.Thus improve the power character of motor within the scope of full working scope and Economy.Existing variable air valve lift range mechanism, major part can only realize 2 sections or 3 sections of adjustments, and can not realize continuous adjustment, engine combustion scheme is limited to by this.
Summary of the invention
Given this, the object of the invention is to provide a kind of variable air valve lift range mechanism that can realize continuous control and regulate, and meanwhile, present invention also offers length-adjustable tappet, described tappet is the important spare part of described variable air valve lift range mechanism.
For solving above technical problem, technological scheme provided by the invention is, provides a kind of tappet, and be provided with elastic component between base and adjustment piston, tappet lid covers adjustment piston, for adjust cam between tappet lid and adjustment piston.
Preferably, described elastic component is spring.
Present invention also offers a kind of full variable air valve lift range mechanism comprising above-mentioned tappet, the tappet lid of described tappet directly or indirectly contacts with valve.
Preferably, described tappet and valve are positioned at the same side of rocking arm, and lay respectively at the two ends of rocking arm, and engine cam is at the opposite side of rocking arm; The tappet lid of tappet and rocking arm hinged.
Further, described adjustment cam is fastenedly connected with adjustment camshaft, and one end of described adjustment camshaft is fixedly connected with drive plate, and adjustment camshaft is perpendicular to drive plate, the piston rod of the fringe region connection for transmission oil cylinder of drive plate, on the cylinder body end articulated frame of transmission oil cylinder.
Further, described transmission oil cylinder oil-feed and fuel-displacedly to be controlled by electromagnetism control fuel tap.
Further, described electromagnetism control fuel tap divides Electromagnetic Control portion and oil circuit control device, and described oil circuit control device is divided into oil-feed section successively, controls oily section and fuel-displaced section, sealed seat surface is provided with between adjacent both ends, oil-feed section is provided with oil inlet hole, controls oily section and is provided with control oilhole, and fuel-displaced section is provided with oil outlet; Be provided with oiling valve in oil-feed section, be provided with outlet valve in fuel-displaced section, described oiling valve is fixedly connected with by connecting rod with described outlet valve, and there is a push rod in described Electromagnetic Control portion, and described push rod contacts with outlet valve.
Further, the filler opening of described control oilhole and transmission oil cylinder is by pipeline communication, and the oil outlet of transmission oil cylinder is communicated with control oilhole by another pipeline.
Preferably, also return spring is installed in described oil-feed section.
Compared with prior art, the length of tappet of the present invention can adjust according to actual needs, and makes variable air valve lift range mechanism realize Total continuity control.When engine cam is in base circle position, adjustment cam turns to maximum height place, and ensure that the spring-compressed of tappet is to minimum position, namely holding out almost to be in is rigidly connected, and now ensures that valve is in closed condition.When adjusting cam and turning to minimum constructive height, tappet spring elongates is to overcome the gap between base and adjustment piston, and now valve is still in closed condition.So just can ensure how no matter adjustment cam rotate, and valve all can normally be closed.
When engine cam is rotated to maximum lift position by basic circle, by rotating the position of adjustment cam, then can realize the change of tappet length, thus realize the adjustment function of valve lift.
The rotation angle of adjustment cam determines the change of valve added lift, will adjust camshaft and be connected with drive plate, by being connected to the ex-ternal transmission piston movement on drive plate, controls the angle that drive plate rotates, thus controls the rotation angle of adjustment cam.Wherein, the stroke of transmission oil cylinder piston is decided by oil inlet quantity and the recirculating oil quantity of transmission oil cylinder.The moment of its oil-feed and oil return and oil mass size are controlled by electromagnetism control fuel tap.In the unregulated situation of valve added lift, electromagnetism control fuel tap does not work; When only needing adjustment valve added lift, electromagnetism control fuel tap just work, and avoiding electromagnetism control fuel tap all needs in running order in each cycle, thus to the opening and closing of electromagnetism control fuel tap requirement and response characteristic all not too high, than being easier to realization.
Accompanying drawing explanation
Fig. 1 is prop column structure schematic diagram in embodiment 1.
Fig. 2 is full variable lift valve operating mechanism structure schematic diagram in embodiment 2.
Fig. 3 adjusts cam drive mechanism schematic diagram in embodiment 2.
Fig. 4 is electromagnetism control fuel tap structural representation in embodiment 2.
Embodiment
Be described below in conjunction with accompanying drawing and specific embodiment.
Embodiment 1
See Fig. 1.Tappet described by the present embodiment, is made up of base 11, adjustment piston 12, tappet lid 13, adjustment cam 14 and elastic component 16.Base 11 can be fixed in frame, or is fixed on rocking arm.Be provided with elastic component 16 between base 11 and adjustment piston 12, tappet lid 13 covers adjustment piston 12, for adjust cam 14 between tappet lid 13 and adjustment piston 12.The present embodiment Elastic assembly 16 is spring.
Embodiment 2
See Fig. 2 to Fig. 4.Full variable air valve lift range mechanism described by the present embodiment, comprises the tappet described in embodiment 1.The tappet lid 13 of described tappet 1 passes through Rocker arm 4 mediate contact with valve 6.That is to say, tappet 1 and valve 6 are positioned at the same side of Rocker arm 4, and lay respectively at the two ends of Rocker arm 4, and engine cam 5 is at the opposite side of Rocker arm 4; The tappet lid 13 of tappet 1 is hinged with Rocker arm 4.
The adjustment cam 14 of each cylinder is fastenedly connected by an adjustment camshaft 15, one end of adjustment camshaft 15 is fixedly connected with drive plate 2, and adjustment camshaft 15 is perpendicular to drive plate 2, the piston rod 32 of the fringe region connection for transmission oil cylinder 3 of drive plate 2, on cylinder body end 33 articulated frame of transmission oil cylinder 3.Drive plate 2 can be circular or square or oval or bar shaped.When the piston rod 32 of transmission oil cylinder stretches, promote drive plate 2, make it rotate with the tie point of drive plate 2 around adjustment camshaft 15.And the oil-feed of transmission oil cylinder 3 and fuel-displaced be controlled by electromagnetism control fuel tap 31.Electromagnetism control fuel tap 31 points of Electromagnetic Control portions and oil circuit control device two parts.Oil circuit control device is divided into oil-feed section successively, controls oily section and fuel-displaced section, is provided with sealed seat surface between adjacent both ends.Oil-feed section is provided with oil inlet hole 311, and control oily section and be provided with control oilhole 312, fuel-displaced section is provided with oil outlet 313.Oiling valve 315 and return spring 317 are installed in oil-feed section.When oiling valve 315 and oil-feed section, the sealed seat surface controlled between oily section are fitted, oil-feed section and the oily section of control are cut off completely, and control oilhole 312 is communicated with formation oily passage with oil outlet 313.Outlet valve 316 is installed in fuel-displaced section, outlet valve 316 and control oily section, sealed seat surface between fuel-displaced section is when fitting, control oily section and fuel-displaced section separated completely, oil inlet hole 311 is communicated with formation oily passage with control oilhole 312.Above-mentioned oiling valve 315 is fixedly connected with by connecting rod with described outlet valve 316, and the length of this connecting rod is greater than the distance of two sealed seat surfaces, more precisely, is that oiling valve 315 and outlet valve 316 at a time can only be fitted with in two sealed seat surfaces.
During the electromagnet coil power in Electromagnetic Control portion, the electromagnetic force that armature produces makes oiling valve 315 together with outlet valve 316 to left movement by push rod, until its sealed seat surface is close to by outlet valve 316, now, oil outlet 313 is closed, oil inlet hole 311 is opened, and machine oil enters control oilhole 312 by oil inlet hole 311, then enters cylinder body by the filler opening 34 of transmission oil cylinder, promote hydraulic piston, piston rod rises; When electromagnet power-off, oiling valve 315 and outlet valve 316 are under the effect of hydraulic coupling and return spring 317, move right, its sealed seat surface is close to by oiling valve 315, now, oil inlet hole 311 is closed, and oil outlet 313 is opened, the machine oil of transmission oil cylinder is got back to oil outlet 313 from oil outlet 35 by control oilhole 312 and is entered engine sump tank, hydraulic piston return.
The machine oil of full variable air valve lift range mechanism derives from engine sump tank, the power source of oil hydraulic pump is bent axle, when electronic control unit and ECU obtain rotating speed and the throttle position signal of motor operation, determine the operating mode residing for motor, dependence is tabled look-up interpolation, obtains moment that electromagnetism control fuel tap opens and open the endurance by the inner MAP data of ECU.If now electromagnetism control fuel tap is failure to actuate, the machine oil that oil hydraulic pump pumps from oil sump, through electromagnetism control fuel tap, does not enter transmission oil cylinder 3, directly gets back to oil sump; If now, variable valve system needs work, and determine electromagnetism control fuel tap start-up time according to ECU and open the endurance, then the machine oil pumped by oil hydraulic pump, enters transmission oil cylinder 3 through electromagnetism control fuel tap, complete the adjustment to tappet length.Wherein ECU determines energising moment and the power on duration of electromagnetism control fuel tap according to the electromagnetism control fuel tap control signal that inner MAP data lookup table interpolation obtains, and then determines that machine oil enters moment and the oil inlet quantity of transmission oil cylinder 3.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claims limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a full variable air valve lift range mechanism, it is characterized in that, comprise tappet (1), elastic component (16) is provided with between its base (11) and adjustment piston (12), tappet lid (13) covers adjustment piston (12), for adjust cam (14) between tappet lid (13) and adjustment piston (12); The tappet lid (13) of described tappet (1) directly or indirectly contacts with valve (6); Described tappet (1) and valve (6) are positioned at the same side of rocking arm (4), and lay respectively at the two ends of rocking arm (4), engine cam (5) opposite side in rocking arm (4); The tappet lid (13) of tappet (1) is hinged with rocking arm (4); Described adjustment cam (14) is fastenedly connected with adjustment camshaft (15), one end of described adjustment camshaft (15) is fixedly connected with drive plate (2), and adjustment camshaft (15) is perpendicular to drive plate (2), the piston rod (32) of the fringe region connection for transmission oil cylinder (3) of drive plate (2), on cylinder body end (33) articulated frame of transmission oil cylinder (3); The oil-feed of described transmission oil cylinder (3) and fuel-displacedly to be controlled by electromagnetism control fuel tap (31); Described electromagnetism control fuel tap (31) point Electromagnetic Control portion and oil circuit control device, described oil circuit control device is divided into oil-feed section successively, controls oily section and fuel-displaced section, sealed seat surface is provided with between adjacent both ends, oil-feed section is provided with oil inlet hole (311), control oily section and be provided with control oilhole (312), fuel-displaced section is provided with oil outlet (313); Oiling valve (315) is installed in oil-feed section, outlet valve (316) is installed in fuel-displaced section, described oiling valve (315) is fixedly connected with by connecting rod with described outlet valve (316), and there is a push rod (314) in described Electromagnetic Control portion, and described push rod (314) outlet valve (316) contacts.
2. full variable air valve lift range mechanism according to claim 1, it is characterized in that, the filler opening (34) of described control oilhole (312) and transmission oil cylinder (3) is by pipeline communication, and the oil outlet (35) of transmission oil cylinder (3) is communicated with control oilhole (312) by another pipeline.
3. full variable air valve lift range mechanism according to claim 1, is characterized in that, is also provided with return spring (317) in described oil-feed section.
4. full variable air valve lift range mechanism according to claim 1, is characterized in that, described elastic component (16) is spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210501842.6A CN102926828B (en) | 2012-11-30 | 2012-11-30 | Full variable valve stroke mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210501842.6A CN102926828B (en) | 2012-11-30 | 2012-11-30 | Full variable valve stroke mechanism |
Publications (2)
| Publication Number | Publication Date |
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| CN102926828A CN102926828A (en) | 2013-02-13 |
| CN102926828B true CN102926828B (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210501842.6A Active CN102926828B (en) | 2012-11-30 | 2012-11-30 | Full variable valve stroke mechanism |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105545401B (en) * | 2015-12-14 | 2018-03-02 | 中国北方发动机研究所(天津) | A kind of high-speed diesel engine Dual Over Head Camshaft timing adjusting device |
| CN106988818A (en) * | 2017-06-09 | 2017-07-28 | 西华大学 | A kind of variable tappet |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2066403A (en) * | 1979-12-21 | 1981-07-08 | Thomson A J | Floating pivot rocker arm |
| US6945204B2 (en) * | 2003-11-12 | 2005-09-20 | General Motors Corporation | Engine valve actuator assembly |
| DE102004048071A1 (en) * | 2004-10-02 | 2006-04-20 | Ina-Schaeffler Kg | Valve drive for a cam-operated lift valve |
| DE102005053607A1 (en) * | 2005-11-10 | 2007-05-16 | Schaeffler Kg | Valve gear of an internal combustion engine |
| CN100400805C (en) * | 2006-07-20 | 2008-07-09 | 姬腾飞 | Timing and lift continuous changeable device for engine air valve |
| KR100820694B1 (en) * | 2006-09-11 | 2008-04-11 | 현대자동차주식회사 | Variable valve lift apparatus |
| DE102008008094B3 (en) * | 2008-02-08 | 2009-05-14 | Meta Motoren- Und Energie-Technik Gmbh | Valve lever assembly for piston combustion engines for changing valve timing of intake valve, has adjustable valve operating unit for working with cam shaft having two cams, and eccentric opening is provided |
| CN101503973A (en) * | 2009-03-27 | 2009-08-12 | 奇瑞汽车股份有限公司 | Air valve lift adjustable engine valve actuating mechanism |
| CN203008980U (en) * | 2012-11-30 | 2013-06-19 | 西华大学 | Tappet and fully variable air valve lift mechanism adopting tappet |
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Effective date of registration: 20200526 Address after: No. 917, floor 9, building 1, No. 666, middle section of Tianfu Avenue, hi tech Zone, Chengdu, Sichuan 610000 Patentee after: Chengdu Feiqing Aviation Technology Co., Ltd Address before: 610039, No. 999, Jin Zhou road, Jinniu District, Sichuan, Chengdu Patentee before: XIHUA University |
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