CN108590801A - A kind of no valve spring engine liquid pressure type variable air valve lift range mechanism - Google Patents
A kind of no valve spring engine liquid pressure type variable air valve lift range mechanism Download PDFInfo
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- CN108590801A CN108590801A CN201810180148.6A CN201810180148A CN108590801A CN 108590801 A CN108590801 A CN 108590801A CN 201810180148 A CN201810180148 A CN 201810180148A CN 108590801 A CN108590801 A CN 108590801A
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- piston
- stator
- valve
- idler wheel
- pressure type
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
- F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
- F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The present invention provides a kind of no valve spring engine liquid pressure type variable air valve lift range mechanisms, including camshaft, stator and valve；Cam sleeve can be rotated around stator on stator；Stator interior is equipped with piston and piston spring, and piston spring provides upward spring force to piston；Piston-rod lower end is fixedly connected with idler wheel, and idler wheel lower end is fixedly connected with valve；The guide groove coordinated with idler wheel is equipped between camshaft inner wall and stator outer wall, guide groove is cam face；By controlling piston upper end hydraulic coupling size, thus it is possible to vary displacement distance of the piston relative to stator, to realize the variable of valve maximum lift.Present invention eliminates valve spring, higher volumetric efficiency may be implemented, while controlling simply, are conducive to the engineering application of changeable air valve technology.
Description
Technical field
The invention belongs to engine variable-valve hydraulic actuating mechanism technical fields, more particularly, to a kind of no valve spring
Engine liquid pressure type variable air valve lift range mechanism.
Background technology
Internal combustion engine is still that thermal efficiency highest, unit volume and the maximum prime mover of power-weight ratio, application are non-so far
Often extensively, however as the gradual shortage and the continuous deterioration of environmental resource of world energy sources, it would be desirable to which internal combustion engine meets more
Stringent emission regulation.Traditional combustion engine takes the camshaft actuated valve of fixed molded line, this makes the discharge of internal combustion engine and oil
Consumption can not reach best in all operating points, and therefore, most internal combustion engine all uses changeable air valve technical controlling to discharge,
Reduce oil consumption.
Changeable air valve technology is broadly divided into variable gas distribution technology based on camshaft and at present without cam distribution technology.The former
It is main to change mechanical structure, therefore simple in structure, fast response time, but because remaining cam, valve is only opposite can
Become, can not arbitrarily can be changed.And it then can arbitrarily change valve timing, lift and duration without cam distribution technology.With regard to driving
Flowing mode divides, and no cam distribution technology is divided into the modes such as electromagnetic drive, electrically driven, motor driving, electro-hydraulic driving.Relative to
The shortcomings of energy consumption of electromagnetic drive is big, and electrically driven response speed is low and unstable, motor-driven system complex, electro-hydraulic drive
It is dynamic it is relatively easy without cam distribution technical pattern, response speed is very fast.However it also have the shortcomings that it is inevitable：Under high rotating speed
Flow rate of hydraulic system is inadequate, and valve reaches at maximum lift and take a seat place, and speed is fast, impact force is big.Therefore it is mainly used for diesel engine
On this lower engine of rotating speed, in addition to this, it is necessary to use expensive electrohydraulic servo system and relative complex control
Technology processed avoids impact of taking a seat to be accurately controlled valve stroke, considerably increases the cost of engine.Therefore, it is necessary to be directed to hair
The specific purposes of motivation uses suitable changeable air valve technology.
Invention content
In view of this, the present invention is directed to propose a kind of no valve spring engine liquid pressure type variable air valve lift range mechanism, leads to
The pressure size of changing mechanism internal hydraulic fluid is crossed, it is final to realize the variable of valve stroke.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of no valve spring engine liquid pressure type variable air valve lift range mechanism, including camshaft, stator and valve；
The cam sleeve can be rotated around the stator on the stator；The camshaft inner wall and institute
It states and is equipped with guide groove between stator outer wall, the guide groove is cam face；
The stator interior is equipped with piston, and the piston can be slided along the stator inner wall gap, and from top to bottom institute
The inner space for stating stator is divided into hydraulic cavities and air chamber；The piston-rod lower end of the piston is fixedly connected with idler wheel, the idler wheel
Lower end is fixedly connected with valve, and the idler wheel is worked in coordination with the guide groove；
The air chamber is equipped with piston spring and is placed on the piston rod of the piston, and upward bullet is provided to the piston
Spring force, the air chamber lower end is equipped with opening, and is communicated with ambient atmosphere environment.
Further, the camshaft every revolution, the idler wheel move up and down once, and the valve opening is made to close one
It is secondary.
Further, the stator outer surface is additionally provided with baffle ring.
Further, the stator interior is additionally provided with oil duct, and described oil duct one end is connected with the hydraulic cavities, the oil duct
The other end is connected with extraneous oil pressure cntrol unit.
Further, the minimum range of the guide groove cross-sectional area is more than the diameter of the idler wheel.
Compared with the existing technology, no valve spring engine liquid pressure type variable air valve lift range mechanism of the present invention, tool
There is following advantage：
No valve spring engine liquid pressure type variable air valve lift range mechanism of the present invention, passes through hydraulic pressure in changing mechanism
The pressure size of fluid, thus it is possible to vary the cooperation rule between idler wheel and guide groove, to realize the variable of valve maximum lift,
The present invention is not necessarily to valve spring, and higher volumetric efficiency may be implemented, need not be under each working cycles to hydraulic system
It is operated, but just hydraulic parameter is adjusted in the case where valve motion rule needs the operating mode changed, ensure valve motion
It can obviously reduce cost on the basis of flexibility and changeability, be conducive to the engineering application of changeable air valve technology.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram when embodiment of the present invention is in valve-closing；
Fig. 2 is the schematic diagram when embodiment of the present invention is in valve opening；
Fig. 3 is the schematic diagram when embodiment of the present invention is in valve falling；
Fig. 4 is the front view when embodiment of the present invention is in valve opening；
Fig. 5 is sectional view along A-A in Fig. 4.
Reference sign：
1. camshaft, 2. stators, 3. guide grooves, 4. piston springs, 5. idler wheels, 6. valves, 7. air chambers, 8. pistons, 9.
Hydraulic cavities；10. oil duct, 11. baffle rings.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To express or implicitly include one or more this feature.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figures 1 to 5, the present invention includes camshaft 1, stator 2 and valve 6；
The camshaft 1 is placed on the stator 2, and can be rotated around the stator 2；1 inner wall of the camshaft
Guide groove 3 is equipped between 2 outer wall of the stator, the guide groove 3 is cam face；The stator 2 is internally provided with piston 8,
The piston 8 can be slided along 2 inner wall gap of the stator, and the inner space of the stator 2 is divided into hydraulic cavities 9 from top to bottom
With air chamber 7；The piston-rod lower end of the piston 8 is fixedly connected with idler wheel 5, and 5 lower end of the idler wheel is fixedly connected with valve 6, described
Idler wheel 5 is worked in coordination with the guide groove 3；The air chamber 7 is equipped with piston spring 4 and is placed on the piston rod of the piston 8,
Upward spring force is provided to the piston 8,7 lower end of the air chamber, which is equipped with, to be open and communicated with ambient atmosphere environment；
1 every revolution of the camshaft, the idler wheel 5 move up and down once, keep 6 open and close of the valve primary；It is logical
Overregulate the pressure size of the hydraulic fluid in the hydraulic cavities 9, thus it is possible to vary downward hydraulic coupling and institute suffered by the piston 8
The interactively between spring force upward suffered by piston 8 is stated, to change movement of the piston 8 relative to the stator 2
Distance, and then realize the variable of 6 lift of valve；
2 outer surface of the stator is additionally provided with baffle ring 11, limits axial movement of the camshaft 1 along the stator 2；
The highest raised position of the guide groove 3 limits the maximum lift of the valve 6；
Oil duct 10 is additionally provided with inside the stator 2,10 one end of the oil duct is connected with the hydraulic cavities 9, the oil duct 10
The other end is connected with extraneous oil pressure cntrol unit；
The minimum range of 3 cross-sectional area of the guide groove be slightly larger than the idler wheel 5 diameter, to avoid the idler wheel 5 by
The guide groove 3 is blocked after thermal expansion.
The course of work of the present invention is as follows：
In Fig. 1, the idler wheel 5 and the base circle portion of the guide groove 3 are engaged, and the valve 6, which is in, closes shape
State；
In fig. 2, the rotation of the camshaft 1 makes the guide groove 3 be in the raised stage, suffered by the piston 6
Downward hydraulic force when being more than the upward spring force of the piston spring 4, the piston 6 drives the idler wheel 5 and the gas
Door 6 moves downward, until the downward hydraulic force suffered by the piston 6 is in balance with the upward spring force of the piston spring 4,
The valve 6 is in open state at this time；The highest raised position of wherein guide groove 3 limits what the idler wheel 5 moved down
Maximum distance limits the maximum lift of the valve 6.
In figure 3, the cam 1 continue rotation so that the guide groove 3 applies the idler wheel 5 upward effect
Power, and overcome the downward hydraulic force suffered by the piston 6, the idler wheel 5 drives the valve 6 to move upwards, and the valve 6 returns
It falls, until closing.In cycles, start subsequent cycle.
When valve maximum lift needs to increase, increase the hydraulic pressure in the hydraulic cavities 9 using extraneous oil pressure cntrol unit
The pressure of fluid, compares Fig. 2, the piston 6 will move down and make again downward hydraulic force suffered by the piston 6 with it is described
The upward spring force of piston spring 4 is in new balance；
When valve maximum lift needs to reduce, reduce the hydraulic pressure in the hydraulic cavities 9 using extraneous oil pressure cntrol unit
The pressure of fluid, compares Fig. 2, the piston 6 will move up and make again downward hydraulic force suffered by the piston 6 with it is described
The upward spring force of piston spring 4 is in new balance；It is worth noting that, when the hydraulic fluid pressure foot in the hydraulic cavities 9
Enough hours, the valve 6 will always be in closed state, and the disconnected cylinder energy-saving function of engine may be implemented.
To sum up, by adjusting the pressure size of the hydraulic fluid in the hydraulic cavities 9, thus it is possible to vary suffered by the piston 8
Interactively between upward spring force suffered by downward hydraulic coupling and the piston 8, to change the piston 8 relative to
The move distance of the stator 2, and then realize the variable of 6 lift of valve.The present invention is not necessarily to valve spring, may be implemented more
High volumetric efficiency, the present invention need not operate hydraulic system under each working cycles, but in valve maximum
Lift needs just to be adjusted hydraulic parameter under the operating mode changed, ensures obviously drop on the basis of valve motion flexibility and changeability
Low engine cost and the service life for improving hydraulic component, be conducive to the engineering application of changeable air valve technology.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (5)
1. a kind of no valve spring engine liquid pressure type variable air valve lift range mechanism, it is characterised in that：Including camshaft (1), determine
Sub (2) and valve (6)；
The camshaft (1) is placed on the stator (2), and can rotate around the stator (2)；The camshaft (1)
Guide groove (3) is equipped between inner wall and the stator (2) outer wall, the guide groove (3) is cam face；
The stator (2) is internally provided with piston (8), and the piston (8) can be slided along the stator (2) inner wall gap, and from upper
And the lower inner space the stator (2) is divided into hydraulic cavities (9) and air chamber (7)；The piston-rod lower end of the piston (8) is solid
Surely connection idler wheel (5), idler wheel (5) lower end are fixedly connected with valve (6), and the idler wheel (5) mutually matches with the guide groove (3)
It closes；
The air chamber (7) is equipped with piston spring (4) and is placed on the piston rod of the piston (8), is provided to the piston (8)
Upward spring force, air chamber (7) lower end is equipped with opening, and is communicated with ambient atmosphere environment.
2. no valve spring engine liquid pressure type variable air valve lift range mechanism according to claim 1, it is characterised in that：Institute
Camshaft (1) every revolution is stated, the idler wheel (5) moves up and down once, keeps the valve (6) open and close primary.
3. no valve spring engine liquid pressure type variable air valve lift range mechanism according to claim 1, it is characterised in that：Institute
It states stator (2) outer surface and is additionally provided with baffle ring (11).
4. no valve spring engine liquid pressure type variable air valve lift range mechanism according to claim 1, it is characterised in that：Institute
It states and is additionally provided with oil duct (10) inside stator (2), described oil duct (10) one end is connected with the hydraulic cavities (9), the oil duct (10)
The other end is connected with extraneous oil pressure cntrol unit.
5. no valve spring engine liquid pressure type variable air valve lift range mechanism according to claim 1, it is characterised in that：Institute
The minimum range for stating guide groove (3) cross-sectional area is more than the diameter of the idler wheel (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810180148.6A CN108590801B (en) | 2018-03-05 | 2018-03-05 | Hydraulic variable valve lift mechanism of spring engine without valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810180148.6A CN108590801B (en) | 2018-03-05 | 2018-03-05 | Hydraulic variable valve lift mechanism of spring engine without valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108590801A true CN108590801A (en) | 2018-09-28 |
| CN108590801B CN108590801B (en) | 2020-04-10 |
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ID=63625708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810180148.6A Active CN108590801B (en) | 2018-03-05 | 2018-03-05 | Hydraulic variable valve lift mechanism of spring engine without valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108590801B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021007765A1 (en) * | 2019-07-16 | 2021-01-21 | 赵秀雄 | Valve transmission mechanism of engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383892A (en) * | 2011-09-28 | 2012-03-21 | 上海交通大学 | Variable air valve lift mechanism of internal combustion engine |
| KR101154401B1 (en) * | 2009-12-04 | 2012-06-15 | 현대자동차주식회사 | Electro-hydraulic variable valve lift apparatus |
| CN103277163A (en) * | 2013-05-07 | 2013-09-04 | 江苏公大动力技术有限公司 | Variable-lift driver |
| CN106285816A (en) * | 2015-05-21 | 2017-01-04 | 北京理工大学 | A kind of hydraulic variable valve and control method thereof |
| CN107676144A (en) * | 2017-09-30 | 2018-02-09 | 中国北方发动机研究所(天津) | A kind of 2/4 Stroke Engine hydraulic variable valve mechanism |
-
2018
- 2018-03-05 CN CN201810180148.6A patent/CN108590801B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101154401B1 (en) * | 2009-12-04 | 2012-06-15 | 현대자동차주식회사 | Electro-hydraulic variable valve lift apparatus |
| CN102383892A (en) * | 2011-09-28 | 2012-03-21 | 上海交通大学 | Variable air valve lift mechanism of internal combustion engine |
| CN103277163A (en) * | 2013-05-07 | 2013-09-04 | 江苏公大动力技术有限公司 | Variable-lift driver |
| CN106285816A (en) * | 2015-05-21 | 2017-01-04 | 北京理工大学 | A kind of hydraulic variable valve and control method thereof |
| CN107676144A (en) * | 2017-09-30 | 2018-02-09 | 中国北方发动机研究所(天津) | A kind of 2/4 Stroke Engine hydraulic variable valve mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021007765A1 (en) * | 2019-07-16 | 2021-01-21 | 赵秀雄 | Valve transmission mechanism of engine |
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| Publication number | Publication date |
|---|---|
| CN108590801B (en) | 2020-04-10 |
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