CN202194695U - Drive mechanism of electro-hydraulic variable valve - Google Patents
Drive mechanism of electro-hydraulic variable valve Download PDFInfo
- Publication number
- CN202194695U CN202194695U CN2011202551903U CN201120255190U CN202194695U CN 202194695 U CN202194695 U CN 202194695U CN 2011202551903 U CN2011202551903 U CN 2011202551903U CN 201120255190 U CN201120255190 U CN 201120255190U CN 202194695 U CN202194695 U CN 202194695U
- Authority
- CN
- China
- Prior art keywords
- return opening
- oil
- fluid port
- hydraulic fluid
- advance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Valve Device For Special Equipments (AREA)
Abstract
The utility model discloses a drive mechanism of an electro-hydraulic variable valve, comprising a hydraulic cylinder, a first oil feed/return port and a second oil feed/return port which are arranged from the top to the bottom of the hydraulic cylinder, therefore a first oil feed/return port channel and a second feed/return port channel are formed on a wall of the hydraulic cylinder; a one-way throttle valve on the wall of the hydraulic cylinder which goes through between the top of the hydraulic cylinder and a hydraulic channel and uses a small hole to throttle; a buffer oil port arranged on the wall of the hydraulic cylinder and on the height between the first oil feed/return port and the second oil feed/return port, wherein the buffer oil port is communicated with one of the first oil feed/return port and the second oil feed/return port on the oil feed end of the hydraulic cylinder in the oil return process. The movement features of the valve including accelerated ascending-slow ascending-accelerated descending-slow descending-stable seating are realized. Compared with the traditional drive mechanism of the hydraulic variable valve, the structure of the drive mechanism is simple and the drive mechanism is simply controlled.
Description
Technical field
The utility model relates to a kind of engine variable-valve hydraulic drive mechanism, relates in particular to a kind of little cylinder diameter short stroke hydraulic cylinder.
Background technique
Internal-combustion engine remains so far that the thermal efficiency is the highest, per unit volume and the maximum prime mover of power-weight ratio; Use very extensive; Yet along with the shortage gradually of world energy sources and the continuous deterioration of environmental resources, we need internal-combustion engine to satisfy stricter Abgasgesetz.Traditional combustion engine is taked the fixedly camshaft actuated valve of molded lines, and this makes the discharging of internal-combustion engine and oil consumption can not reach best at all operating points, and therefore, internal combustion engine all adopts changeable air valve technology control discharging mostly, reduces oil consumption.
The changeable air valve technology mainly is divided into based on the variable gas distribution technology of camshaft at present and does not have cam distribution technology.The former mainly changes mechanical structure, and therefore simple in structure, speed of response is fast, but because kept cam, its valve is just variable relatively, can not be variable arbitrarily.Do not have cam distribution technology and then can change valve timing, lift and duration arbitrarily.Divide with regard to driving mode, no cam distribution technology is divided into modes such as Electromagnetic Drive, electric driving, motor driving, electric liquid driving.Energy consumption with respect to Electromagnetic Drive is big, and the speed of response of electric driving is low and unstable, and shortcomings such as motor-driven system complex, the no cam distribution technical pattern that electric liquid drives are simple relatively, speed of response is fast.Yet it also has inevitable shortcoming: valve reaches the maximum lift place and takes a seat that place's speed is fast, impact force is big, the valve serious wear.Therefore must adopt buffer technology.But because engine valve lift is very little; Speed of response is fast; General middle and high hydraulic pressure and the little cylinder diameter short stroke hydraulic cylinder of adopting improves speed of response; Causing not having the complicated damping device of enough space mounting and reduce the valve wearing and tearing. this increases the cost of changeable air valve greatly with regard to the proportional servo system of needs costliness and the control technique of relative complex.Therefore, research structure is simple, and it is imperative to control simple variable valve gear.
The model utility content
To above-mentioned existing technology; In order to reduce cost; In limited installing space, solve because of adopting changeable air valve that hydraulics drives at the maximum lift place and the big difficult problem of place's impact force of taking a seat, the utility model provides a kind of driving mechanism of electric liquid changeable air valve.This oil hydraulic cylinder except that two with conventional cylinder advance/return opening, also adopted an one-way throttle fuel tap, one the buffering hydraulic fluid port.Relative conventional cylinder, change little, but oil-feed and oil return can effectively be played buffer function, are applicable to the engine variable-valve system.
In order to solve the problems of the technologies described above; The technological scheme that the driving mechanism of a kind of electric liquid changeable air valve of the utility model is achieved is: comprise oil hydraulic cylinder; Said oil hydraulic cylinder is top-down to be provided with first to advance/and return opening and second advances/return opening; Thereby on cylinder wall, form first to advance/return opening passage and second advances/the return opening passage; / return opening and second outside and advance said first at said oil hydraulic cylinder advance/connect one or two position four-way solenoid valve between the return opening, and said two position four-way solenoid valves control said first to advance/return opening and second advances/return opening oil-filled and draining the oil; On said cylinder wall, also be provided with the top that runs through said oil hydraulic cylinder to said first hydraulic channel between an one-way throttle valve, said one-way throttle valve adopts orifice restriction; On said cylinder wall; Advancing said first/return opening and second advances/be provided with a buffering hydraulic fluid port on the height between the return opening, and said buffering hydraulic fluid port advances with said first in the process of oil hydraulic cylinder oil-feed and oil return/return opening and second advances/and in the return opening one communicates; The lower edge of the maximum lift S of said the hydraulic cylinder piston distance h between the piston head upper edge and said buffering hydraulic fluid port and when not working between the piston head upper edge between the distance H between the upper edge of said buffering hydraulic fluid port and when not working; Said second advance/lower edge of return opening and when not working the distance between the piston head lower edge equal the lower edge of said buffering hydraulic fluid port and the distance H between the upper edge of piston head when not working; The inside nominal diameter of said buffering hydraulic fluid port is less than said first advancing/inside nominal diameter of return opening; The height of piston head is poor less than the maximum lift of piston 1 and said buffering hydraulic fluid port inside nominal diameter.
In the driving mechanism of a kind of electric liquid changeable air valve of the utility model, be sealed into clearance seal between piston head and the cylinder wall.Said one-way throttle valve adopts the plug-in type one-way throttle valve.
Compared with prior art, the beneficial effect of the utility model is:
The utility model hydraulic cylinder structure is simple; Control is simple; Need not adopt special proportion servo-control system; When guaranteeing that valve is opened quick closedown fast, valve maximum lift place and the place's of taking a seat speed significantly reduce and do not have obvious hydraulic coupling and impact, and make that the changeable air valve technology of electrichydraulic control is further perfect.
Description of drawings
Fig. 1 is that the driving mechanism of a kind of electric liquid changeable air valve of the utility model is in systematic schematic diagram when not working.
Fig. 2 is that the driving mechanism of a kind of electric liquid changeable air valve of the utility model is in maximum lift place systematic schematic diagram.
Among the figure:
1---first advances/return opening 2---second advances/return opening 3---piston
4---valve spring 5---valve 6---buffering hydraulic fluid ports
7---fuel tank 8---cylinder wall 9---one-way throttle valves
10---two position four-way solenoid valves
Embodiment
Below in conjunction with embodiment the utility model is done to describe in further detail.
As shown in Figure 1; The driving mechanism of a kind of electric liquid changeable air valve of the utility model; Comprise oil hydraulic cylinder; Said oil hydraulic cylinder 8 comprises that from top to bottom first advancing of being provided with/return opening 1 and second advances/return opening 2; Thereby on cylinder wall, form first to advance/return opening passage and second advances/the return opening passage ,/return opening 1 and second outside and advance said first at said oil hydraulic cylinder advance/connect one or two position four-way solenoid valve 10 between the return opening 2,10 controls said first of said two position four-way solenoid valves advance/return opening 1 and second advances/and return opening 2 oil-filled and draining the oil; On said cylinder wall 8, also be provided with the top that runs through said oil hydraulic cylinder 8 to said first hydraulic channel between an one-way throttle valve 9, said one-way throttle valve 9 adopts orifice restrictions; On said cylinder wall 8; Advancing said first/return opening 1 and second advances/be provided with a buffering hydraulic fluid port 6 on the height between the return opening 2; Said buffering hydraulic fluid port 6 is connected to fuel tank 7 through pipeline, said buffering hydraulic fluid port 6 the oil hydraulic cylinder oil-feed terminal with oil return on the way in advance with said first/return opening 1 and second advances/in the return opening 2 one communicates; As shown in Figure 2, the upper edge of said buffering hydraulic fluid port 6 and when not working the distance h between the upper edge of piston head less than the maximum lift S of piston; The lower edge of said buffering hydraulic fluid port 6 and when not working the distance H between the upper edge of piston head greater than the maximum lift S of piston; Said second advance/lower edge of return opening 2 and when not working the distance between the piston head lower edge equal the lower edge of said buffering hydraulic fluid port 6 and the distance H between the upper edge of piston head when not working; The inside nominal diameter of said buffering hydraulic fluid port 6 is less than said first advancing/inside nominal diameter of return opening 1; The height of piston head is poor less than the maximum lift of piston and said buffering hydraulic fluid port inside nominal diameter.Be sealed into clearance seal between piston head and the cylinder wall 8.Said one-way throttle valve 9 adopts the plug-in type one-way throttle valve.Piston 3 links to each other with valve 5, and piston motion drives valve motion.
The working principle of the driving mechanism of a kind of electric liquid changeable air valve of the utility model is: as shown in Figure 2; The lower edge of the maximum lift S of the hydraulic cylinder piston distance h between the piston head upper edge and said buffering hydraulic fluid port and when not working between the piston head upper edge between the distance H between the upper edge of said buffering hydraulic fluid port and when not working; Change the position of lower edge on the buffering hydraulic fluid port 6, the maximum functional stroke changes thereupon, wherein; Second advance/return opening 2 lower edges are slightly larger than the maximum functional stroke S of piston to the distance H of piston head lower edge; So both can effectively produce throttling action, and be unlikely to again when backhaul, to form negative pressure, produce bubble.One end of one-way throttle valve 9 advances with first/return opening 1 links to each other, realize from first advance/return opening 1 do not have throttling to one-way throttle valve 9, thereby can realize that valve 5 opens rapidly, and advance/return opening 1 generation orifice restriction to first from one-way throttle valve 9.The other end of one-way throttle valve 9 is connected to the top of oil hydraulic cylinder, thereby realizes linking to each other with the piston head top.The upper edge to the first of piston head advances/the safety protection distance of a slight distance (being generally below the 1mm) when taking a seat of return opening 1 upper edge for piston 3, can avoid because install, the perhaps buffer invalidation that exists micro-gap to cause between piston rod and the valve stem of causing uneven in temperature.The inside nominal diameter of said buffering hydraulic fluid port 6 can keep certain choke pressure like this less than described first advancing/inside nominal diameter of return opening 1 at the maximum lift place, improve the stability of piston 3 operations.Because the height and the width of piston head are all smaller, therefore, the clearance seal mode is adopted in the sealing between piston head and the cylinder wall 6.The driving mechanism of a kind of electric liquid changeable air valve of the utility model realizes that the motion mode of valve is identical with traditional valve motion mode, that is: valve at first quickens to rise, and slowing down then rises reaches the maximum lift place.During decline, quickening earlier to descend, slows down and descends in the back.
The working procedure of the driving mechanism of a kind of electric liquid changeable air valve of the utility model is: at first; When valve 5 is opened, first advance/return opening 1 oil inlet passage is because of being kept off by piston, temporarily do not have oil-feed; And one-way throttle valve 9 can realize through another passage since first advance/return opening 1 do not have the throttling oil-feed; Second advances/return opening 2 and the 6 common oil returns of buffering hydraulic fluid port, and input pressure overcomes the acting of valve spring 4 pretightening forces, and piston 3 promotes valve 5 and quickens descending.When the upper edge that piston 3 comes downwards to piston head surpass first to advance/during return opening 1 upper edge, first advance/return opening 1 accelerates oil-feed with one-way throttle valve 9.Descending gradually along with piston 3, because the reaction force of valve spring 4 strengthens, meanwhile, the trend that piston 3 acceleration decline process medium velocities rise slows down.Advance when piston 3 comes downwards to piston head lower edge to the second/during the upper edge of return opening 2, second advances on the one hand/and return opening 2 part passages will be closed by piston 3, and the oil extraction area reduces gradually, begins to carry out throttling, and the oil extraction resistance increases; On the other hand, this moment, the upper edge of piston head also arrived buffering hydraulic fluid port 6 upper edges, and buffering hydraulic fluid port 6 passages are opened gradually; Oil-feed begins to leak from buffering hydraulic fluid port 6; Input pressure descends, so this moment, velocity of piston declined to a great extent, valve slows rises; Final hydraulic coupling and spring force are in balance, are stabilized in the maximum lift place.Through to system optimization, the piston maximum lift can slight modification but (for example, when other conditions were all constant, buffering hydraulic fluid port 6 inside nominal diameters diminished, and the piston maximum lift increases between h and H all the time; Valve spring rigidity reduces, and the piston maximum lift increases; Charge oil pressure increases, and the piston maximum lift increases).
When valve need be closed, 10 switching-overs of two position four-way solenoid valves, second advances/return opening 2 beginning oil-feeds; Buffering hydraulic fluid port 6, first advances/return opening 1 and one-way throttle valve 9 common oil returns; At this moment, the equidirectional effect of hydraulic coupling and spring force, piston 3 quickens up; In this process, valve spring power reduces gradually.When piston 3 upper edges go upward to buffering hydraulic fluid port 6 upper edges, buffering hydraulic fluid port 6 pathway closures, at this moment, first advances/return opening 1 and one-way throttle valve 9 common oil returns, and total oil extraction area is compared and is reduced.When piston 3 lower edges went upward to buffering hydraulic fluid port 6 lower edges, on the one hand, buffering hydraulic fluid port 6 passages were opened again; Oil-feed begins to leak from buffering hydraulic fluid port 6, and input pressure declines to a great extent, and acceleration reduces; On the other hand, piston 3 upper edges also have been up to first to advance/return opening 1 near, first advance/return opening 1 passage closes gradually; Throttling action is obvious, owing to mainly be that spring force accounts for leading role at this moment, but not the spring force of conventional hydraulic changeable air valve accounts for leading role with input pressure; Therefore by contrast, the impact force that produces during buffering is also not obvious, also reduces the speed of piston 3 simultaneously rapidly.Along with first advance/return opening 1 passage closes fully, the upper edge of piston head gets into the safe buffering stage because the orifice restriction of one-way throttle valve 9, the speed of piston 3 finally is stabilized in a fixed value, realizes steadily taking a seat of valve.
In a word, the driving mechanism of a kind of electric liquid changeable air valve of the utility model be a kind of can be at valve maximum lift place and the place of taking a seat can both play effective buffer function and don't can cause the oil hydraulic cylinder that bigger fluid power impacts.Advance except having two of conventional cylinder/return opening 1,2, also comprise an one-way throttle valve 9 and one buffering hydraulic fluid port 6, therefore, near maximum lift, the buffering hydraulic fluid port advances with one/return opening communicates and carry out draining, plays the effect of reduction input pressure; And in the way of taking a seat, buffering hydraulic fluid port 4 advances with another/and return opening communicates, and reduces input pressure, thus reduce hydraulic cushion power, and---------slowly decline---kinetic characteristic of steadily taking a seat of quickening to descend slowly rises to realize that finally valve quickens to rise.Compare with the conventional hydraulic variable valve actuation, it is simple in structure, control is simple.
Although top combination figure is described the utility model; But the utility model is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under the enlightenment of the utility model; Under the situation that does not break away from the utility model aim, can also make a lot of distortion, these all belong within the protection of the utility model.
Claims (4)
1. the driving mechanism of an electric liquid changeable air valve; Comprise oil hydraulic cylinder; Said oil hydraulic cylinder is top-down to be provided with first to advance/and return opening (1) and second advances/return opening (2), thereby on cylinder wall, form first to advance/return opening passage and second advances/the return opening passage, it is characterized in that:
Be positioned at said oil hydraulic cylinder outside and advance said first/return opening (1) and second advances/returns to connect one or two position four-way solenoid valve (10) between mouthful (2), said two position four-way solenoid valves (10) control said first to advance/return opening (1) and second advances/return opening (2) oil-filled and draining the oil;
On said cylinder wall (8), also be provided with the top that runs through said oil hydraulic cylinder (8) to said first hydraulic channel between an one-way throttle valve (9), said one-way throttle valve (9) adopts orifice restriction;
On said cylinder wall (8); Be positioned at said first to advance/return opening (1) and second advances/be provided with a buffering hydraulic fluid port (6) on the height between the return opening (2), said buffering hydraulic fluid port (6) the oil hydraulic cylinder oil-feed terminal with oil return on the way in advance with said first/return opening (1) and second advances/in the return opening (2) one communicates;
The upper edge of said buffering hydraulic fluid port (6) and when not working the distance h between the upper edge of piston head less than the maximum lift S of piston;
The lower edge of said buffering hydraulic fluid port (6) and when not working the distance H between the upper edge of piston head greater than the maximum lift S of piston;
Said second advance/lower edge of return opening (2) and when not working the distance between the piston head lower edge equal the lower edge of said buffering hydraulic fluid port (6) and the distance H between the upper edge of piston head when not working;
The inside nominal diameter of said buffering hydraulic fluid port (6) is less than said first advancing/inside nominal diameter of return opening (1);
The height of piston head is poor less than the maximum lift S of piston and said buffering hydraulic fluid port inside nominal diameter.
2. the driving mechanism of a kind of electric liquid changeable air valve according to claim 1 is characterized in that: be sealed into clearance seal between piston head and the cylinder wall (8).
3. the driving mechanism of a kind of electric liquid changeable air valve according to claim 1 is characterized in that: said one-way throttle valve (9) adopts the plug-in type one-way throttle valve.
4. the driving mechanism of a kind of electric liquid changeable air valve according to claim 1 is characterized in that: and the upper edge to the first of said piston head advances/and distance between return opening (1) upper edge is less than 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202551903U CN202194695U (en) | 2011-07-19 | 2011-07-19 | Drive mechanism of electro-hydraulic variable valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202551903U CN202194695U (en) | 2011-07-19 | 2011-07-19 | Drive mechanism of electro-hydraulic variable valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202194695U true CN202194695U (en) | 2012-04-18 |
Family
ID=45949611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202551903U Expired - Fee Related CN202194695U (en) | 2011-07-19 | 2011-07-19 | Drive mechanism of electro-hydraulic variable valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202194695U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278161A (en) * | 2011-07-19 | 2011-12-14 | 天津大学 | Cushioning hydraulic cylinder for variable valve |
| CN103216290A (en) * | 2013-04-09 | 2013-07-24 | 江苏公大动力技术有限公司 | Variable lift driver |
| CN103388502A (en) * | 2013-07-31 | 2013-11-13 | 哈尔滨工程大学 | Full changeable electro-hydraulic air valve driving device |
| WO2015096183A1 (en) * | 2013-12-28 | 2015-07-02 | 大连理工大学 | Modularized multifunctional variable valve actuation system for use in 4-cylinder internal combustion engine |
| CN104791043A (en) * | 2015-04-23 | 2015-07-22 | 哈尔滨工程大学 | Valve electro-hydraulic driving system and method for achieving Miller cycle of engine |
-
2011
- 2011-07-19 CN CN2011202551903U patent/CN202194695U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278161A (en) * | 2011-07-19 | 2011-12-14 | 天津大学 | Cushioning hydraulic cylinder for variable valve |
| CN102278161B (en) * | 2011-07-19 | 2013-07-24 | 天津大学 | Cushioning hydraulic cylinder for variable valve |
| CN103216290A (en) * | 2013-04-09 | 2013-07-24 | 江苏公大动力技术有限公司 | Variable lift driver |
| CN103216290B (en) * | 2013-04-09 | 2015-06-10 | 宁波华液机器制造有限公司 | Variable lift driver |
| CN103388502A (en) * | 2013-07-31 | 2013-11-13 | 哈尔滨工程大学 | Full changeable electro-hydraulic air valve driving device |
| CN103388502B (en) * | 2013-07-31 | 2016-01-27 | 哈尔滨工程大学 | A kind of full changeable electro-hydraulic air valve drive unit |
| WO2015096183A1 (en) * | 2013-12-28 | 2015-07-02 | 大连理工大学 | Modularized multifunctional variable valve actuation system for use in 4-cylinder internal combustion engine |
| CN104791043A (en) * | 2015-04-23 | 2015-07-22 | 哈尔滨工程大学 | Valve electro-hydraulic driving system and method for achieving Miller cycle of engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102278161B (en) | Cushioning hydraulic cylinder for variable valve | |
| CN202194695U (en) | Drive mechanism of electro-hydraulic variable valve | |
| CN102305222B (en) | Electro-hydraulic variable valve device with energy accumulator buffer function and energy storage method thereof | |
| CN1287069C (en) | Pressure differential style air valve variation control system | |
| CN101865002B (en) | Electrically-controlled hydraulic variable valve mechanism for internal combustion engine | |
| CN106121763A (en) | Electro-hydraulic variable valve system with one-way throttle valve buffering | |
| CN107676142B (en) | Hydraulic drive variable valve mechanism with low pressure control and high pressure | |
| CN110094244A (en) | The electro-hydraulic full variable gas distribution actuator of one kind and its control method | |
| CN101560999A (en) | Large-flow quick throttle proportional valve | |
| CN103388502A (en) | Full changeable electro-hydraulic air valve driving device | |
| CN107100689A (en) | A kind of solenoid-operated hydraulic drive-type fully variable valve actuator for air | |
| CN103670570B (en) | A kind of variable valve system of bidirectional spring buffering | |
| CN207377616U (en) | A kind of hydraulic-driven variable valve actuator for air of low voltage control high pressure | |
| CN205908328U (en) | Four properties door engine variable valve mechanism | |
| CN106703928B (en) | Exhaust valve control execution system directly driven by servo oil | |
| CN206860248U (en) | A kind of solenoid-operated hydraulic drive-type fully variable valve actuator for air | |
| CN209244627U (en) | Multistage draining exhaust valve | |
| CN202866922U (en) | Diesel engine air spring solenoid drive air valve mechanism | |
| CN201723263U (en) | Electric control hydraulic variable valve mechanism for internal combustion engine | |
| CN102913299A (en) | Air spring electromagnetically-driving valve mechanism of diesel engine | |
| CN203640795U (en) | Variable valve system of two-way spring buffering type | |
| CN104314635A (en) | Variable driver | |
| CN112412566B (en) | Control method of variable valve mechanism based on slide valve control | |
| CN205400837U (en) | Cam drive type engine hydraulic pressure gas door control device | |
| EP3901426B1 (en) | Valve train and engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120418 Termination date: 20130719 |