CN103850746B - A kind of variable air valve lift apparatus of based upon activities cam - Google Patents
A kind of variable air valve lift apparatus of based upon activities cam Download PDFInfo
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- CN103850746B CN103850746B CN201410071966.4A CN201410071966A CN103850746B CN 103850746 B CN103850746 B CN 103850746B CN 201410071966 A CN201410071966 A CN 201410071966A CN 103850746 B CN103850746 B CN 103850746B
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- push rod
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Abstract
The invention discloses a kind of variable air valve lift apparatus of based upon activities cam, comprise movable cam, valve assembly, rocking arm, tappet, camshaft, solenoid valve, it is inner that described camshaft is in described movable cam, the rotation of described camshaft drives movable cam to rotate, described valve stem is moved back and forth, thus utilize the lever principle compression valve Spring driving engine valve of rocking arm, make described movable cam basic circle axis relative to described camshaft axis runout several angle by controlling described solenoid valve, thus change original distance between described movable cam and described valve stem, realize the variable of valve lift, the present invention both can use separately, also can combine with timing mechanism and realize full changeable air valve, wide accommodation, energy consumption is low, control simple, be conducive to the popularization on the engine of variable gas distribution technology.
Description
Technical field
The present invention relates to a kind of engine variable valve lift device.
Background technique
Internal-combustion engine remains that the thermal efficiency is the highest so far, per unit volume and the maximum prime mover of power-weight ratio, application widely, but along with shortage and the continuous deterioration of environmental resources gradually of world energy sources, we need internal-combustion engine to meet stricter Abgasgesetz.Traditional combustion engine takes the actuated by cams valve of fixing molded line, and this makes the discharge of internal-combustion engine and oil consumption can not reach best at all operating points, and therefore, most internal combustion engine all adopts changeable air valve technical controlling to discharge, and reduces oil consumption.
Changeable air valve technology is mainly divided at present based on the variable gas distribution technology of cam and without cam distribution technology.The former can be subdivided into again the mechanical variable gas distribution technology based on cam and the electric liquid variable gas distribution technology based on cam, wherein, change the characteristics of motion of valve mainly through a series of cam and gear based on the mechanical variable gas distribution technology of cam, therefore structure is relatively simple, fast response time, but because remain cam, its valve is relative variable, can not be variable arbitrarily.
And based on the electric liquid variable gas distribution technology of cam, a valve stroke part is provided by cam, another part is changed by hydroelastic system, and its feature is, valve variable pitch is more flexible, consumes energy also lower, but it is taken a seat and is still subject to the restriction of cam.
Then valve timing, lift, duration and times of exercise can be changed arbitrarily without cam distribution technology.Divide with regard to driving mode, be divided into the modes such as Electromagnetic Drive, electrically driving, motor driving, electric liquid driving without cam distribution technology.Large relative to the energy consumption of Electromagnetic Drive, electric gas-powered speed of response is low and unstable, the shortcomings such as motor-driven system complex, electric liquid drive without cam distribution technical pattern relatively simply, speed of response is very fast.But it also has inevitable shortcoming: under high rotating speed, flow rate of hydraulic system is inadequate, valve reaches maximum lift place and takes a seat that place's speed is fast, impact force is large.
Summary of the invention
For above-mentioned prior art, the invention provides a kind of variable air valve lift apparatus of based upon activities cam, comprise movable cam, valve assembly, rocking arm, valve stem, camshaft, solenoid valve, described camshaft is radially provided with bearing pin, inside is provided with movable plunger, described movable cam is provided with long guiding hole vertically and described pin is worked in coordination, by controlling described solenoid valve, control the motion of described movable plunger, thus drive described movable cam to rotate along described pin, change the distance between described movable cam and described tappet, realize the variable arbitrarily of valve lift.
In order to solve the problems of the technologies described above, the variable air valve lift apparatus of a kind of based upon activities cam of the present invention, comprise movable cam, camshaft, valve assembly, rocking arm, valve stem, solenoid valve, the rotation of described camshaft drives movable cam to rotate, described valve stem is moved back and forth, thus utilize the lever principle compression valve Spring driving engine valve of rocking arm, the inside of described movable cam is provided with guiding elongated slot vertically, described movable cam is provided with long guiding hole vertically, the outer surface of described movable cam is provided with the direction recess of a circle inverted T-shape along sense of rotation, described long guiding hole and direction recess are positioned at axial positions different on movable cam, and both positions are not overlapping, described camshaft is through described guiding elongated slot, and be provided with radial direction through hole at the middle part of described camshaft, described radial direction through hole is built with a bearing pin, and meanwhile, the two ends of described bearing pin are embedded in described long guiding hole, the external rotary surface of described camshaft is radially provided with the first plunger hole and the second plunger hole, the first plunger is provided with in described first plunger hole, the second plunger is provided with in described second plunger hole, the inside of described camshaft is provided with oil inlet and oil return passage vertically, described first plunger hole is blind hole, piston spring is provided with in the bottom of the first plunger, described first plunger compresses with described piston spring and is connected, described second plunger hole communicates with described oil inlet and oil return passage, and described oil inlet and oil return passage is controlled by a solenoid valve, described first plunger contacts with the internal surface of guiding elongated slot with the top of the second plunger, described valve stem comprises the first push rod and the second push rod, compressed by a push rod spring between described first push rod and described second push rod and connect, described first push rod and described second push rod are along engine cylinder wall vertical motion, the elastic force of described push rod spring is less than the pretightening force of described valve spring, simultaneously, the elastic force of described push rod spring is less than the elastic force of piston spring, the bottom of described second push rod is hinged with roller, the external frame of described roller is inverted T-shape, and described roller moves in described direction recess.The present invention, by Controlling solenoid valve, realizes the rotation of movable cam relative to camshaft, thus realizes the adjustable of valve lift,
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is the variable air valve lift apparatus of based upon activities cam, both can use separately, and also can combine with timing mechanism and realize full changeable air valve, wide accommodation, energy consumption is low, controls simple, is conducive to the popularization on the engine of variable gas distribution technology.
Accompanying drawing explanation
Fig. 1 is the erection drawing of variable valve gear of the present invention under former machine valve is in closed condition;
Fig. 2 is the erection drawing of variable valve gear of the present invention under former machine valve is in maximum lift state;
Fig. 3 is erection drawing variable valve gear of the present invention is in valve opening state when valve maximum lift increases under;
Fig. 4 is erection drawing variable valve gear of the present invention is in valve-closing state when valve maximum lift increases under;
Fig. 5-1 is the end direction view of movable cam in the present invention;
Fig. 5-2 is left sectional views of the A-A of movable cam shown in Fig. 5-1 slice location;
Fig. 6-1 is the axial view of convexity wheel shaft of the present invention;
Fig. 6-2 is left sectional views of the B-B of camshaft shown in Fig. 6-1 slice location;
Fig. 7 is the plan view of valve stem in the present invention.
In figure:
1-movable cam 2-camshaft 3-valve assembly 4-rocking arm
5-valve stem 6-solenoid valve 11-long guiding hole 12-direction recess
13-guiding elongated slot 21-first plunger 22-bearing pin 23-oil inlet and oil return passage
24-second plunger 51-first push rod 52-second push rod 53-roller
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
As depicted in figs. 1 and 2, the variable air valve lift apparatus of a kind of based upon activities cam of the present invention, comprises movable cam 1, camshaft 2, valve assembly 3; Rocker arm 4, valve stem 5, solenoid valve 6; rotation of described camshaft 2 drives movable cam 1 to rotate; described valve stem 5 is moved back and forth, thus utilizes the lever principle compression valve Spring driving engine valve of Rocker arm 4, realizes engine valve and opens and closes.
As shown in Fig. 5-1 and Fig. 5-2, the inside of described movable cam 1 is provided with guiding elongated slot 13 vertically, this guiding elongated slot 13 is through movable cams, described movable cam 1 is provided with long guiding hole 11 vertically, movable cam 1 can be moved left and right along camshaft for this long guiding hole, the outer surface of described movable cam 1 is provided with the direction recess 12 of a circle inverted T-shape along sense of rotation, described long guiding hole 11 and direction recess 12 are positioned at axial positions different on movable cam 1, and both positions are not overlapping; As shown in Figure 1, described camshaft 2 passes described guiding elongated slot 13, as shown in Fig. 6-1 and Fig. 6-2, radial direction through hole is provided with at the middle part of described camshaft 2, described radial direction through hole is built with a bearing pin 22, and meanwhile, the two ends of described bearing pin 22 are embedded in described long guiding hole 11; Described movable cam 1 can slide and rotation along described long guiding hole 11 relative to bearing pin 22.
As shown in Fig. 1 and Fig. 6-1, the external rotary surface of described camshaft 2 is radially provided with the first plunger hole and the second plunger hole, the first plunger 21 is provided with in described first plunger hole, the second plunger 24 is provided with in described second plunger hole, the inside of described camshaft 2 is provided with oil inlet and oil return passage 23 vertically, described first plunger hole is blind hole, piston spring is provided with in the bottom of the first plunger, described first plunger 21 compresses with described piston spring and is connected, described second plunger hole communicates with described oil inlet and oil return passage 23, and described oil inlet and oil return passage 23 is controlled by a solenoid valve 6; Described first plunger 21 contacts with the internal surface of guiding elongated slot 13 with the top of the second plunger 24;
As shown in Figure 7, described valve stem 5 comprises the first push rod 51 and the second push rod 52, compressed by a push rod spring between described first push rod 51 and described second push rod 52 and connect, described first push rod 51 and described second push rod 52 are along the Engine Cylinder Wall vertical motion shown in Fig. 1, the elastic force of described push rod spring is less than the pretightening force of described valve spring, simultaneously, the elastic force of described push rod spring is less than the elastic force of piston spring, the bottom of described second push rod 52 is hinged with roller 53, the external frame of described roller 53 is inverted T-shape, described roller moves in described direction recess 12.
The working procedure of variable air valve lift apparatus of the present invention is as follows:
Fig. 1 and Fig. 2 is the erection drawing of variable valve gear of the present invention under former machine valve is in closed condition and under valve maximum lift state respectively, now under the control of described solenoid valve 6, the first oil return of described oil inlet and oil return passage 23 is closed again, described movable cam 1 is at pressure tightly described second plunger 24 of described first plunger 21, described movable cam 1 basic circle axis and described camshaft 2 dead in line, described valve stem 5 bottom roller moves along described movable cam 1 direction recess 12, thus realizes valve-closing and valve opening.
Fig. 3 is erection drawing variable valve gear of the present invention is in valve opening state when valve maximum lift increases under, now under the control of described solenoid valve 6, the first oil-feed of described oil inlet and oil return passage 23 is closed again, described first plunger 21 will overcome described second plunger 24 power makes described movable cam 1 basic circle axis rotate to cam direction relative to described camshaft 2 axis, work in coordination will described movable cam 1 right side in figure be made mobile due to described roller 53 and described movable cam 1 direction recess 12 simultaneously, thus cause valve maximum lift to increase.
Fig. 4 is erection drawing variable valve gear of the present invention is in valve-closing state when valve maximum lift increases under, now described solenoid valve 6 is relative to no change in Fig. 3, described roller 53 makes described movable cam 1 mobile relative to described camshaft 2 left side in figure with coordinating of described direction recess 12 on the one hand, described movable cam 1 will be made to pull described second push rod 52 to move downward on the other hand, when the position of described valve stem 5 lower than valve stem 5 described in Fig. 1, described first push rod 51 is separated with described second push rod 52 under the effect of push rod spring, thus eliminate because adjustment valve maximum lift is on the impact of valve-closing state.Wherein, the spring force between described valve stem 5 is less than described valve 3 initial tension of spring and described first plunger 21 spring force all the time, thus avoids described valve 3 to be backed down, and overcomes described first plunger 21 spring force described movable cam 1 is rotated.
As mentioned above, by controlling movable cam 1 basic circle axis relative to the rotation angle between described camshaft 2 axis, thus have adjusted valve maximum lift.
Although invention has been described for composition graphs above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept, can also make a lot of distortion, these all belong within protection of the present invention.
Claims (1)
1. the variable air valve lift apparatus of a based upon activities cam, comprise movable cam (1), camshaft (2), valve assembly (3); rocking arm (4); valve stem (5), solenoid valve (6), the rotation of described camshaft (2) drives movable cam (1) to rotate; described valve stem (5) is moved back and forth; thus utilize the lever principle compression valve Spring driving engine valve of rocking arm (4), it is characterized in that
The inside of described movable cam (1) is provided with guiding elongated slot (13) vertically, described movable cam (1) is provided with vertically long guiding hole (11), the outer surface of described movable cam (1) is provided with the direction recess (12) of a circle inverted T-shape along sense of rotation; Described long guiding hole (11) and direction recess (12) are positioned at the upper different axial position of movable cam (1), and both positions are not overlapping;
Described camshaft (2), through described guiding elongated slot (13), is provided with radial direction through hole at the middle part of described camshaft (2), and described radial direction through hole is built with a bearing pin (22), and meanwhile, the two ends of described bearing pin (22) are embedded in described long guiding hole (11);
The external rotary surface of described camshaft (2) is radially provided with the first plunger hole and the second plunger hole, the first plunger (21) is provided with in described first plunger hole, the second plunger (24) is provided with in described second plunger hole, the inside of described camshaft (2) is provided with oil inlet and oil return passage (23) vertically, described first plunger hole is blind hole, piston spring is provided with in the bottom of the first plunger, described first plunger (21) compresses with described piston spring and is connected, described second plunger hole communicates with described oil inlet and oil return passage (23), described oil inlet and oil return passage (23) is controlled by a solenoid valve (6), described first plunger (21) contacts with the internal surface of guiding elongated slot (13) with the top of the second plunger (24),
Described valve stem (5) comprises the first push rod (51) and the second push rod (52), compressed by a push rod spring between described first push rod (51) and described second push rod (52) and connect, described first push rod (51) and described second push rod (52) are along Engine Cylinder Wall vertical motion, the elastic force of described push rod spring is less than the pretightening force of described valve spring, simultaneously, the elastic force of described push rod spring is less than the elastic force of piston spring, the bottom of described second push rod (52) is hinged with roller (53), the external frame of described roller (53) is inverted T-shape, described roller moves in described direction recess (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410071966.4A CN103850746B (en) | 2014-02-28 | 2014-02-28 | A kind of variable air valve lift apparatus of based upon activities cam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410071966.4A CN103850746B (en) | 2014-02-28 | 2014-02-28 | A kind of variable air valve lift apparatus of based upon activities cam |
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| CN103850746A CN103850746A (en) | 2014-06-11 |
| CN103850746B true CN103850746B (en) | 2015-12-02 |
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Families Citing this family (9)
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| CN104234843B (en) * | 2014-09-23 | 2017-06-13 | 何权 | A kind of electric control valve and its control system |
| CN106321182B (en) * | 2015-06-29 | 2018-11-27 | 上海高斯通船舶配件有限公司 | Internal combustion engine mechanical valve lift adjusts buffer unit |
| CN108240244B (en) * | 2017-12-29 | 2023-12-19 | 潍柴动力股份有限公司 | Variable system of diesel engine inlet valve and diesel engine |
| CN108803672B (en) * | 2018-04-25 | 2021-12-14 | 武汉高德红外股份有限公司 | Photoelectric tracking system |
| CN108738534B (en) * | 2018-08-09 | 2021-10-22 | 郭在斌 | Soybean planter |
| CN110685768B (en) * | 2019-10-18 | 2021-07-20 | 姬腾飞 | Variable valve driving device of engine and engine |
| CN111456828B (en) * | 2020-04-23 | 2021-04-16 | 浙江精湛化油器有限公司 | Valve lift adjustable device based on connecting rod transmission principle |
| CN111520210B (en) * | 2020-04-29 | 2021-05-28 | 江苏赛耐气门有限公司 | Valve stroke adjustable device based on eccentric chute transmission principle |
| CN112211689B (en) * | 2020-10-14 | 2022-03-29 | 天津大学 | Control method of electro-hydraulic fully-variable valve mechanism based on distribution cam |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1119700A (en) * | 1994-07-20 | 1996-04-03 | 郝立华 | Microcomputer controlled ac hydraulic variable distribution phase type engine |
| JPH1018821A (en) * | 1996-06-28 | 1998-01-20 | Otix:Kk | Variable valve gear |
| CN101215978A (en) * | 2007-12-26 | 2008-07-09 | 奇瑞汽车有限公司 | Engine air valve controlling mechanism |
| JP2011111893A (en) * | 2009-11-23 | 2011-06-09 | Denso Corp | Variable valve timing control device of internal combustion engine |
| CN102383892B (en) * | 2011-09-28 | 2013-08-28 | 上海交通大学 | Variable air valve lift mechanism of internal combustion engine |
| CN103174490B (en) * | 2013-04-01 | 2014-10-22 | 天津大学 | Hydraulic pressure variable valve device based on rotor control |
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