CN103850745B - A kind of plunger type variable valve gear based on split cam - Google Patents
A kind of plunger type variable valve gear based on split cam Download PDFInfo
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- CN103850745B CN103850745B CN201410071945.2A CN201410071945A CN103850745B CN 103850745 B CN103850745 B CN 103850745B CN 201410071945 A CN201410071945 A CN 201410071945A CN 103850745 B CN103850745 B CN 103850745B
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Abstract
The invention discloses a kind of plunger type variable valve gear based on split cam, comprise movable cam, engine valve, rocking arm, tappet, camshaft, plunger, switch electromagnetic valve, described movable cam inside is provided with hydraulic pressure cavity, plunger is provided with in hydraulic pressure cavity, the outer surface of described camshaft is provided with stationary cam, described stationary cam aligns along the axial position of described camshaft and the position of described plunger, the profile contacts of described plunger and stationary cam, described stationary cam drives plunger to-and-fro motion in hydraulic pressure cavity, by the opening and closing of control switch solenoid valve, described camshaft drives described movable cam to swing, and then realize the change of valve timing and lift, the present invention both can use separately, also can with without cam distribution combine with technique, solve its underfed, the shortcoming that seating velocity is fast.Wide accommodation, energy consumption is low, controls simple, is 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 hydraulic actuator.
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 plunger type variable valve gear based on split cam, the present invention both can use separately, also can with without cam distribution combine with technique, solve in prior art the underfed existed, the shortcoming that seating velocity is fast.Wide accommodation, energy consumption is low, controls simple, is conducive to the popularization on the engine of variable gas distribution technology.
In order to solve the problems of the technologies described above, a kind of plunger type variable valve gear based on split cam of the present invention, comprise movable cam, engine valve, rocking arm, tappet and camshaft, the two ends of described rocking arm compress with described tappet and described engine valve respectively and are connected, the other end of described tappet and described movable cam profile contacts, described movable cam is in axial direction provided with through hole, described through hole coordinates with described cam axle, described movable cam swings the rotation driving described rocking arm around camshaft, thus driving engine valve, engine valve spring provides restoring force, the axis middle part being positioned at described through hole is provided with first ring connected in star, described first ring connected in star and described through hole are coaxially arranged, the inside of described movable cam is provided with hydraulic pressure cavity and first passage, the bottom of described hydraulic pressure cavity communicates with described first ring connected in star, described first passage is connected to rotary surface in described through hole from the top of described hydraulic pressure cavity, described first passage by with hydraulic pressure cavity bottom through axial direction part and the radial section through with described first ring connected in star form, plunger is provided with in described hydraulic pressure cavity, the inside of described camshaft is in axial direction provided with second channel, the external rotary surface of described camshaft is provided with a stationary cam and the second annular groove, one end of described second channel is connected with low pressure oil sources by a switch electromagnetic valve, the other end of described second channel communicates with described second annular groove, and described second annular groove aligns along the axial position of described camshaft and the position of described first passage, described stationary cam aligns along the axial position of described camshaft and the position of described plunger, the profile contacts of described plunger and stationary cam, and described stationary cam drives plunger to-and-fro motion in hydraulic pressure cavity.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is the plunger type variable valve gear based on split cam, plunger is provided with in movable cam inside, described camshaft outside is provided with stationary cam, and this stationary cam drives plunger to-and-fro motion in hydraulic pressure cavity, by the opening and closing of control switch solenoid valve, described camshaft drives described movable cam to swing, and then realize the change of valve timing and lift, the present invention both can use separately, also can with without cam distribution combine with technique, solve its underfed, the shortcoming that seating velocity is fast.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 valve-closing state;
Fig. 2 is the erection drawing of variable valve gear of the present invention under valve opening state;
Fig. 3-1 is the end direction view of movable cam in the present invention;
Fig. 3-2 is left sectional views of the A-A of movable cam shown in Fig. 3-1 slice location;
Fig. 4-1 is the end direction view of convexity wheel shaft of the present invention;
Fig. 4-2 is left views (provided with electromagnetic valve schematic diagram) of camshaft shown in Fig. 4-1;
In figure: 1-movable cam, 2-valve (band spring), 3-rocking arm, 4-tappet, 5-camshaft, 6-plunger, 7-switch electromagnetic valve, 11-first passage, 12-hydraulic pressure cavity, 13-first ring connected in star, 14-through hole, 51-second channel, 52-stationary cam, 53-second annular groove.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
As depicted in figs. 1 and 2, a kind of plunger type variable valve gear based on split cam of the present invention, comprise movable cam 1, engine valve 2, rocking arm 3, tappet 4 and camshaft 5, the two ends of described rocking arm 3 compress with described tappet 4 and described engine valve 2 respectively and are connected, the other end of described tappet 4 and described movable cam 1 profile contacts, as shown in Fig. 3-1 and Fig. 3-2, described movable cam 1 is in axial direction provided with through hole 14, described through hole 14 is rotatably assorted with described camshaft 5, described movable cam 1 swings the rotation driving described rocking arm 3 around camshaft 5, thus drive engine valve 2.The axis middle part being positioned at described through hole 14 is provided with first ring connected in star 13, described first ring connected in star 13 is coaxially arranged with described through hole 14, the inside of described movable cam 1 is provided with hydraulic pressure cavity 12 and first passage 11, the top of described hydraulic pressure cavity 12 communicates with described first ring connected in star 13, described first passage 11 is connected to rotary surface in described through hole 14 from the bottom of described hydraulic pressure cavity 12, described first passage 11 by with hydraulic pressure cavity 12 bottom through axial direction part and the radial section through with described first ring connected in star 13 form; Plunger 6 is provided with in described hydraulic pressure cavity 12.
As shown in Fig. 4-1 and Fig. 4-2, the inside of described camshaft 1 is in axial direction provided with second channel 51, the external rotary surface of described camshaft 2 is provided with stationary cam 52 and second annular groove 53, one end of described second channel 51 is connected with low pressure oil sources by a switch electromagnetic valve 7, the other end of described second channel 51 communicates with described second annular groove 53, and described second annular groove 53 aligns along the axial position of described camshaft 1 and the position of described first passage 11; Described stationary cam 52 aligns along the axial position of described camshaft 1 and the position of described plunger 6, and as depicted in figs. 1 and 2, the profile contacts of described plunger and stationary cam 52, described stationary cam 52 drives plunger to-and-fro motion in hydraulic pressure cavity 12.
The working procedure of variable valve gear of the present invention is as follows:
Fig. 1 is the schematic diagram under variable valve gear original state (valve-closing) of the present invention, now described switch electromagnetic valve 7 is in open mode, described hydraulic pressure cavity 12 is communicated with low pressure oil sources by first passage 11, second channel 12, the rotation of described camshaft 5 drives the to-and-fro motion of movable cam 1 internal piston 6, under the effect of plunger 6 frictional force, make described cam 1 along rotating clockwise, because described plunger 6 frictional force is less than valve spring force, described cam 1 protruding end is near described tappet 4 but described tappet 4 is moved.
Fig. 2 is the schematic diagram under variable valve gear opening state of the present invention.When valve is determined to open, now described switch electromagnetic valve 7 is in closed condition, and the relatively described hydraulic pressure cavity 12 of described plunger 6 keeps motionless, the rotation rotating clockwise the described plunger 6 of drive and described movable cam 1 of described camshaft 5, valve opening.
When engine valve 2 is determined to close, described switch electromagnetic valve 7 is in open mode, described hydraulic pressure cavity 12 communicates with low pressure oil sources, the rotation of described camshaft 5 will cause described plunger 6 away from described camshaft 5, described cam 1 rotates counterclockwise under the reaction force of described tappet 4, and valve falls after rise.
As mentioned above, the moment communicated with low pressure oil sources by switch electromagnetic valve 7 hydraulic control chamber 12 and time, thus start-up time and the endurance (valve lift) that can control valve, the duration is longer, and valve lift is larger.Variable arbitrarily in the cam ascent stage that wherein valve opening time can contact with described plunger 6 at described stationary cam 52.
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 plunger type variable valve gear based on split cam, comprise movable cam (1), engine valve (2), rocking arm (3), tappet (4) and camshaft (5), the two ends of described rocking arm (3) compress with described tappet (4) and described engine valve (2) respectively and are connected, the other end of described tappet (4) and described movable cam (1) profile contacts, described movable cam (1) is in axial direction provided with through hole (14), described through hole (14) and described camshaft (5) are rotatably assorted, described movable cam (1) swings the rotation driving described rocking arm (3) around camshaft (5), thus drive engine valve (2),
It is characterized in that,
The axis middle part being positioned at described through hole (14) is provided with first ring connected in star (13), described first ring connected in star (13) and described through hole (14) are coaxially arranged, the inside of described movable cam (1) is provided with hydraulic pressure cavity (12) and first passage (11), the bottom of described hydraulic pressure cavity (12) communicates with described first ring connected in star (13), described first passage (11) is connected to the interior rotary surface of described through hole (14) from the top of described hydraulic pressure cavity (12), described first passage (11) is made up of the axial direction part through with hydraulic pressure cavity (12) bottom and the radial section through with described first ring connected in star (13), plunger (6) is provided with in described hydraulic pressure cavity (12),
The inside of described camshaft (1) is in axial direction provided with second channel (51), the external rotary surface of described camshaft (1) is provided with a stationary cam (52) and the second annular groove (53), one end of described second channel (51) is connected with low pressure oil sources by a switch electromagnetic valve (7), the other end of described second channel (51) communicates with described second annular groove (53), and described second annular groove (53) aligns along the axial position of described camshaft (1) and the position of described first passage (11); Described stationary cam (52) aligns along the axial position of described camshaft (1) and the position of described plunger (6), the profile contacts of described plunger (6) and stationary cam (52), described stationary cam (52) drives plunger to-and-fro motion in hydraulic pressure cavity (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410071945.2A CN103850745B (en) | 2014-02-28 | 2014-02-28 | A kind of plunger type variable valve gear based on split cam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410071945.2A CN103850745B (en) | 2014-02-28 | 2014-02-28 | A kind of plunger type variable valve gear based on split cam |
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| CN103850745A CN103850745A (en) | 2014-06-11 |
| CN103850745B true CN103850745B (en) | 2015-11-04 |
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| CN201410071945.2A Active CN103850745B (en) | 2014-02-28 | 2014-02-28 | A kind of plunger type variable valve gear based on split cam |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104234843B (en) * | 2014-09-23 | 2017-06-13 | 何权 | A kind of electric control valve and its control system |
| CN110107674B (en) * | 2019-06-05 | 2024-03-01 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Double-sided cam mechanism |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215978A (en) * | 2007-12-26 | 2008-07-09 | 奇瑞汽车有限公司 | Engine air valve controlling mechanism |
| CN103174490A (en) * | 2013-04-01 | 2013-06-26 | 天津大学 | Hydraulic pressure variable valve device based on rotor control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1018821A (en) * | 1996-06-28 | 1998-01-20 | Otix:Kk | Variable valve gear |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215978A (en) * | 2007-12-26 | 2008-07-09 | 奇瑞汽车有限公司 | Engine air valve controlling mechanism |
| CN103174490A (en) * | 2013-04-01 | 2013-06-26 | 天津大学 | Hydraulic pressure variable valve device based on rotor control |
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