CN103850746A - Variable valve lift device based on movable cam - Google Patents
Variable valve lift device based on movable cam Download PDFInfo
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- CN103850746A CN103850746A CN201410071966.4A CN201410071966A CN103850746A CN 103850746 A CN103850746 A CN 103850746A CN 201410071966 A CN201410071966 A CN 201410071966A CN 103850746 A CN103850746 A CN 103850746A
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- valve
- movable cam
- push rod
- plunger
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Abstract
The invention discloses a variable valve lift device based on a movable cam. The variable valve lift device comprises the movable cam, a valve component, a rocking arm, a tappet rod, a cam shaft and an electromagnetic valve, wherein the cam shaft is positioned in the movable cam; a rotating band of the cam shaft is used for driving the movable cam to rotate, so that a valve push rod reciprocates. By use of the lever principle of the rocking arm, a valve spring is compressed so as to drive an engine valve; by virtue of controlling the electromagnetic valve, the axis of a base circle of the movable cam deviates a certain angle relative to that of the cam shaft, so that the original distance between the movable cam and the valve push rod is changed, and variable valve lift is realized. The variable valve lift device not only can be independently applied, but also can be combined with a timing mechanism so as to realize a full-variable valve, is wide in application range, low in energy consumption, simple in control and beneficial to popularization of a variable gas distribution technology in an engine.
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, prime mover of per unit volume and power-weight ratio maximum, apply very extensive, but along with the shortage gradually of world energy sources and the continuous deterioration of environmental resources, we need internal-combustion engine to meet stricter Abgasgesetz.Traditional combustion engine is taked the actuated by cams valve of fixing molded line, and this makes the discharge of internal-combustion engine and oil consumption not to reach best at all operating points, and therefore, internal combustion engine all adopts changeable air valve technology control discharge mostly, reduces oil consumption.
Changeable air valve technology is mainly divided into variable gas distribution technology based on cam and at present 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, mechanical variable gas distribution technology based on cam mainly changes the characteristics of motion of valve by a series of cam and gear, therefore structure is relatively simple, fast response time, but because retained cam, its valve is just relatively variable, can not be variable arbitrarily.
And electric liquid variable gas distribution technology based on cam, a valve stroke part is provided by cam, and another part is changed by hydroelastic system, and its feature is, and valve variable pitch is more flexible, consume energy also lower, but it is taken a seat and is still subject to the restriction of cam.
Can change arbitrarily valve timing, lift, duration and times of exercise without cam distribution technology.Divide with regard to driving mode, be divided into the modes such as Electromagnetic Drive, electric driving, motor driving, electric liquid driving without cam distribution technology.Energy consumption with respect to Electromagnetic Drive is large, and 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 is relatively simple, speed of response is very fast.But it also has inevitable shortcoming: under high rotating speed, flow rate of hydraulic system is inadequate, and 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 based on movable 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 vertically long guiding hole and described pin is worked in coordination, by controlling described solenoid valve, control the motion of described movable plunger, thereby 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, a kind of variable air valve lift apparatus based on movable 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, thereby 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, on described movable cam, be provided with vertically long guiding hole, on the outer surface of described movable cam, be 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, through described guiding elongated slot, is provided with radial direction through hole at the middle part of described camshaft, and a bearing pin is housed in described radial direction through hole, and meanwhile, the two ends of described bearing pin are embedded in described long guiding hole, on the external rotary surface of described camshaft, be radially provided with the first plunger hole and the second plunger hole, in described the first plunger hole, be provided with the first plunger, in described the second plunger hole, be provided with the second plunger, the inside of described camshaft is provided with oil inlet and oil return passage vertically, described the first plunger hole is blind hole, bottom at the first plunger is provided with piston spring, described the first plunger compresses and is connected with described piston spring, described the 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, the top of described the first plunger and the second plunger contacts with the internal surface of guiding elongated slot, described valve stem comprises the first push rod and the second push rod, between described the first push rod and described the second push rod, compress and connect by a push rod spring, described the first push rod and described the 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 the 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 with respect to camshaft, thereby 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 based on movable cam, both can use separately, also can be with timing mechanism in conjunction with realizing full changeable air valve, and wide accommodation, energy consumption is low, controls simply, is conducive to the popularization of variable gas distribution technology on motor.
Accompanying drawing explanation
Fig. 1 be variable valve gear of the present invention at former machine valve the erection drawing under closed condition;
Fig. 2 be variable valve gear of the present invention at former machine valve the erection drawing under maximum lift state;
Fig. 3 is variable valve gear of the present invention erection drawing under valve opening state in the time that valve maximum lift increases;
Fig. 4 is variable valve gear of the present invention erection drawing under valve-closing state in the time that valve maximum lift increases;
Fig. 5-1st, in the present invention, the end of movable cam is to view;
Fig. 5-2nd, the left sectional view of the A-A of movable cam shown in Fig. 5-1 slice location;
Fig. 6-1st, the axial view of convexity wheel shaft of the present invention;
Fig. 6-2nd, the left sectional view 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-the first plunger 22-bearing pin 23-oil inlet and oil return passage
24-second plunger 51-first push rod 52-the 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, a kind of variable air valve lift apparatus based on movable 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, thereby utilize the lever principle compression valve Spring driving engine valve of Rocker arm 4, realize engine valve opening and closing.
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 to connect movable cam, on described movable cam 1, be provided with vertically long guiding hole 11, movable cam 1 can be moved left and right along camshaft for this long guiding hole, on the outer surface of described movable cam 1, be 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 is through described guiding elongated slot 13, as shown in Fig. 6-1 and Fig. 6-2, middle part at described camshaft 2 is provided with radial direction through hole, one bearing pin 22 is housed in described radial direction through hole, and meanwhile, the two ends of described bearing pin 22 are embedded in described long guiding hole 11; Described movable cam 1 can slide with respect to bearing pin 22 along described long guiding hole 11 and rotate.
As shown in Fig. 1 and Fig. 6-1, on the external rotary surface of described camshaft 2, be radially provided with the first plunger hole and the second plunger hole, in described the first plunger hole, be provided with the first plunger 21, in described the second plunger hole, be provided with the second plunger 24, the inside of described camshaft 2 is provided with oil inlet and oil return passage 23 vertically, described the first plunger hole is blind hole, bottom at the first plunger is provided with piston spring, described the first plunger 21 compresses and is connected with described piston spring, described the 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; The top of described the first plunger 21 and the second plunger 24 contacts with the internal surface of guiding elongated slot 13;
As shown in Figure 7, described valve stem 5 comprises the first push rod 51 and the second push rod 52, between described the first push rod 51 and described the second push rod 52, compress and connect by a push rod spring, described the first push rod 51 and described the 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 the second push rod 52 is hinged with roller 53, the external frame of described roller 53 is inverted T-shape, described roller is in the interior motion of 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 erection drawing under closed condition and under valve maximum lift state that is respectively variable valve gear of the present invention at former machine valve, 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 compresses described the second plunger 24 under the pressure of described the first plunger 21, described movable cam 1 basic circle axis and 2 deads in line of described camshaft, described valve stem 5 bottom rollers move along described movable cam 1 direction recess 12, thereby realize valve-closing and valve opening.
Fig. 3 is variable valve gear of the present invention erection drawing under valve opening state in the time that valve maximum lift increases, 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 the first plunger 21 will overcome described the second plunger 24 power make described movable cam 1 basic circle axis with respect to described camshaft 2 axis to cam direction rotation, simultaneously because described roller 53 and described movable cam 1 direction recess 12 are worked in coordination and will described movable cam 1 be moved to right side in figure, thereby cause valve maximum lift to increase.
Fig. 4 is variable valve gear of the present invention erection drawing under valve-closing state in the time that valve maximum lift increases, now described solenoid valve 6 is with respect to no change in Fig. 3, make on the one hand the coordinating of described roller 53 and described direction recess 12 described movable cam 1 mobile to left side in figure with respect to described camshaft 2, to make on the other hand described movable cam 1 pull described the second push rod 52 to move downward, when described valve stem 5 is during lower than the position of valve stem 5 described in Fig. 1, described the first push rod 51 will separate with described the second push rod 52 under the effect of push rod spring, thereby eliminate because adjusting the impact of valve maximum lift on valve-closing state.Wherein, the spring force between described valve stem 5 is less than described valve 3 initial tension of spring and described the first plunger 21 spring forces all the time, thereby avoids described valve 3 to be backed down, and overcomes described the first plunger 21 spring forces described movable cam 1 is rotated.
As mentioned above, by controlling movable cam 1 basic circle axis with respect to the rotation angle between described camshaft 2 axis, thereby adjusted valve maximum lift.
Although in conjunction with figure, invention has been described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; in the situation that not departing from aim of the present invention, can also make a lot of distortion, within these all belong to protection of the present invention.
Claims (1)
1. the variable air valve lift apparatus based on movable 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, on described movable cam (1), be provided with vertically long guiding hole (11), on the outer surface of described movable cam (1), be 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 a bearing pin (22) is housed in described radial direction through hole, and meanwhile, the two ends of described bearing pin (22) are embedded in described long guiding hole (11);
On the external rotary surface of described camshaft (2), be radially provided with the first plunger hole and the second plunger hole, in described the first plunger hole, be provided with the first plunger (21), in described the second plunger hole, be provided with the second plunger (24), the inside of described camshaft (2) is provided with oil inlet and oil return passage (23) vertically, described the first plunger hole is blind hole, bottom at the first plunger is provided with piston spring, described the first plunger (21) compresses and is connected with described piston spring, described the 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), the top of described the first plunger (21) and the second plunger (24) contacts with the internal surface of guiding elongated slot (13),
Described valve stem (5) comprises the first push rod (51) and the second push rod (52), between described the first push rod (51) and described the second push rod (52), compress and connect by a push rod spring, described the first push rod (51) and described the 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 the 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).
Priority Applications (1)
| 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 true CN103850746A (en) | 2014-06-11 |
| CN103850746B CN103850746B (en) | 2015-12-02 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234843A (en) * | 2014-09-23 | 2014-12-24 | 何权 | Electrically-controlled air valve and control system thereof |
| CN106321182A (en) * | 2015-06-29 | 2017-01-11 | 上海高斯通船舶配件有限公司 | Mechanical valve lift adjusting and buffering device for internal combustion engine |
| CN108240244A (en) * | 2017-12-29 | 2018-07-03 | 潍柴动力股份有限公司 | Diesel engine inlet valve variable system and diesel engine |
| CN108738534A (en) * | 2018-08-09 | 2018-11-06 | 郭在斌 | A kind of soybean planting device |
| CN108803672A (en) * | 2018-04-25 | 2018-11-13 | 武汉高德红外股份有限公司 | Photoelectric follow-up |
| CN110685768A (en) * | 2019-10-18 | 2020-01-14 | 姬腾飞 | Variable valve driving device of engine and engine |
| CN111520210A (en) * | 2020-04-29 | 2020-08-11 | 施红 | Valve stroke adjustable device based on eccentric chute transmission principle |
| CN112211689A (en) * | 2020-10-14 | 2021-01-12 | 天津大学 | Control method of electro-hydraulic fully-variable valve mechanism based on distribution cam |
| 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 |
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Patent Citations (6)
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| CN1119700A (en) * | 1994-07-20 | 1996-04-03 | 郝立华 | Microcomputer controlled pulsed flow hydraulic variable distribution phase type engine |
| JPH1018821A (en) * | 1996-06-28 | 1998-01-20 | Otix:Kk | Variable valve gear |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234843A (en) * | 2014-09-23 | 2014-12-24 | 何权 | Electrically-controlled air valve and control system thereof |
| CN106321182A (en) * | 2015-06-29 | 2017-01-11 | 上海高斯通船舶配件有限公司 | Mechanical valve lift adjusting and buffering device for internal combustion engine |
| 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 |
| CN108240244A (en) * | 2017-12-29 | 2018-07-03 | 潍柴动力股份有限公司 | Diesel engine inlet valve variable system and diesel engine |
| 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 |
| CN108803672A (en) * | 2018-04-25 | 2018-11-13 | 武汉高德红外股份有限公司 | Photoelectric follow-up |
| CN108738534A (en) * | 2018-08-09 | 2018-11-06 | 郭在斌 | A kind of soybean planting device |
| CN110685768A (en) * | 2019-10-18 | 2020-01-14 | 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 |
| CN111520210A (en) * | 2020-04-29 | 2020-08-11 | 施红 | Valve stroke adjustable device based on eccentric chute transmission principle |
| CN112211689A (en) * | 2020-10-14 | 2021-01-12 | 天津大学 | Control method of electro-hydraulic fully-variable valve mechanism based on distribution cam |
| 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 |
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