CN110159386A - Internal combustion engine two-stage variable air valve lift range mechanism - Google Patents
Internal combustion engine two-stage variable air valve lift range mechanism Download PDFInfo
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- CN110159386A CN110159386A CN201910386182.3A CN201910386182A CN110159386A CN 110159386 A CN110159386 A CN 110159386A CN 201910386182 A CN201910386182 A CN 201910386182A CN 110159386 A CN110159386 A CN 110159386A
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- guiding groove
- internal combustion
- guide portion
- deep
- combustion engine
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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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
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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
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
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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 internal combustion engine two-stage variable air valve lift range mechanism applied to I. C. engine parts technical field, cam sleeve (2) movable set of the internal combustion engine two-stage variable air valve lift range mechanism is on camshaft (1), deep guiding groove (7) and shallow guide portion (8) are set on cam sleeve (2), the distance of deep guiding groove (7) bottom surface to camshaft (1) center line is set smaller than shallow guide portion (8) bottom surface to the distance of camshaft (1) center line, deep guiding groove (7) includes deep guiding groove straight line groove portion I (11), deep guiding groove curve groove portion (12), deep guiding groove straight line groove portion II (13), shallow guide portion (8) includes shallow guide portion straight line portion I (14), shallow guide portion curve part (15), internal combustion engine two-stage variable air valve lift range mechanism of the present invention, energy The adjusting of enough convenient and reliable relative positions for realizing camshaft and cam sleeve, it is ensured that internal combustion engine can work at the moment under optimum condition, reduce oil consumption.
Description
Technical field
The invention belongs to I. C. engine parts technical fields, are to be related to a kind of internal combustion engine two-stage more specifically
Variable air valve lift range mechanism.
Background technique
As current thermal efficiency highest, the dynamic power machine being most widely used, general power is accounted for and is moved used in the whole world internal combustion engine
The 90% of power device general power is the major consumers channel of the world oil energy.With the increase of car ownership, internal combustion engine stone
Oily consumption figure will increase sharply, and contradiction between oil supply and demand is necessarily on the rise, and while consuming mass energy, internal combustion engine is also big
The maximum source of compression ring border, especially urban air pollution, it can be seen that, internal-combustion engine technology is innovated, for energy saving,
Mitigate environmental pollution to be of great significance.On the other hand, with increasingly stringent, low emission and the environmental protection of countries in the world emission regulation
Have become the precondition that engine enters market, becomes the important topic that current auto industry is faced.Traditional combustion engine,
Valve stroke is fixed and invariable, and leads to either big load or small load condition, and valve stroke is opened equally, causes the energy
Waste, the thermal efficiency are low.The defect of variable air valve lift range mechanism in the prior art: 1. 1 pin shafts and a helicla flute cooperate,
It is mobile to control one direction of axle sleeve.Therefore existing variable air valve lift range mechanism at least needs two pin shafts.One pin shaft is for a left side
It moves, a pin is for moving to right.Structure is complicated, at high cost；2. the left-handed and dextrorotation of existing helicla flute point, is laid on axis, increase
Add axle sleeve axial distance, has demand to arrangement space on the engine.
Summary of the invention
The technical problems to be solved by the present invention are: it is simple to provide a kind of structure, and it is at low cost, it convenient and reliable can realize convex
The adjusting of the relative position of wheel shaft and cam sleeve realizes the two-stage adjustment of valve stroke cam, so that it is guaranteed that internal combustion engine can
Moment works under optimum condition, reduces oil consumption, improves performance, is conducive to the internal combustion engine two-stage variable valve stroke for saving the energy
Mechanism.
Solve the problems, such as techniques discussed above, the technical scheme adopted by the invention is as follows:
The present invention is a kind of internal combustion engine two-stage variable air valve lift range mechanism, the internal combustion engine two-stage variable valve stroke machine
Structure includes camshaft, cam sleeve, solenoid valve, multiple cams portion is arranged on camshaft, every group of cam part respectively includes a height
Spool is arranged on camshaft in cam and a low cam, cam sleeve movable set on solenoid valve, solenoid valve with can control
The control unit of the flexible switching of spool connects, and the shallow guide portion of recessed deep guiding groove and protrusion is arranged on cam sleeve, draws deeply
The distance of guide groove bottom surface to camshaft centerline is set smaller than shallow guide portion bottom surface to the distance of camshaft centerline, deep guidance
Slot includes deep guiding groove straight line groove portion I, deep guiding groove curve groove portion, deep guiding groove straight line groove portion II, and shallow guide portion includes shallowly drawing
Lead portion straight line portion I, shallow guide portion curve part.
The deep guiding groove includes deep guiding groove guide surface I and deep guiding groove guide surface II, the shallow guide portion packet
Include shallow guide portion guide surface.
The deep guiding groove straight line groove portion I of the deep guiding groove of cam sleeve cloth parallel with deep guiding groove straight line groove portion II
It sets, the deep guiding groove straight line groove portion I of deep guiding groove and the shallow guide portion straight line portion I of shallow guide portion are arranged in parallel；Described shallowly draws
The shallow guide portion curve part one end for leading portion is connected to shallow I one end of guide portion straight line portion, and the shallow guide portion curve part other end is set as
It can extend to the structure close to deep I position of guiding groove straight line groove portion.
The spool of the solenoid valve includes high-order stretching stroke and low level stretches out stroke, and a high position stretches out stroke and is set as big
The structure of stroke is stretched out in low level, the internal combustion engine two-stage variable air valve lift range mechanism is from high cam state to low cam state
When switching, control unit is configured to control valve core 3 according to the high-order structure stretching out stroke and stretching out, and the internal combustion engine two-stage can
When air valve variation lift mechanisms switch from low cam state to high cam state, control unit is configured to control valve core according to low
The structure that stroke stretches out is stretched out in position.
The radius of the spool of the solenoid valve of the internal combustion engine two-stage variable air valve lift range mechanism is R, the deep guidance
Slot straight line groove portion I and the distance of shallow guide portion straight line portion I are sized to R+R+h, deep II He of guiding groove straight line groove portion
The distance of shallow guide portion straight line portion I is sized to R+R.
The deep guiding groove curve groove portion of the deep guiding groove of the internal combustion engine two-stage variable air valve lift range mechanism is arranged to
Enough structures to the recessed arrangement in deep guiding groove external position direction, the shallow guide portion curve part of the shallow guide portion are arranged to
Enough structures to the recessed arrangement in shallow guide portion external position direction.
When the internal combustion engine two-stage variable air valve lift range mechanism switches from high cam state to low cam state, control unit
Part is configured to control solenoid valves, so that control valve core is according to the high-order structure stretching out stroke and stretching out, control unit control
When spool processed stretches out stroke stretching according to a high position, the cam sleeve is configured under the turning effort of camshaft, is drawn
Guide valve core stretches out the structure for snapping fitted to deep I position of guiding groove straight line groove portion of deep guiding groove, and spool stretching snaps fitted to deep guiding groove
Deep guiding groove straight line I position of groove portion when, under the turning effort of camshaft, spool be configured to force draws in deep guiding groove
Cam sleeve is pushed axially to slide the structure of h distance to the left relative to camshaft on guide face I, spool force pushes cam sleeve phase
For camshaft, axially for sliding h after, control unit is configured to the structure that control valve core is retracted to original state to the left.
When the internal combustion engine two-stage variable air valve lift range mechanism switches from low cam state to high cam state, control unit
Part is configured to control solenoid valves, so that control valve core stretches out the structure of stroke, control unit control valve according to low level
When core stretches out stroke according to low level, cam sleeve is configured under the turning effort of camshaft, guide spool and shallow guidance
When the shallow guide portion of the structure of the shallow guide portion guidance face contact in portion, spool and shallow guide portion guides face contact, in camshaft
Under turning effort, the spool be configured to force push cam sleeve relative to cam shaft to the right slide h distance
Structure, spool force push cam sleeve relative to cam shaft to the right sliding h distance after, control unit is configured to
Control valve core is retracted to the structure of original state.
The guiding groove is helicla flute or scarf.
Spool return mechanism is set in the solenoid valve, and spool return mechanism is spring, electromagnet suction, permanent magnet suction
One of power.
Using technical solution of the present invention, can obtain it is below the utility model has the advantages that
Internal combustion engine two-stage variable air valve lift range mechanism of the present invention, by camshaft, cam sleeve, solenoid valve, if
The groove face of the cooperation and guiding groove of setting the guiding groove on cam sleeve moves towards setting, the spool of solenoid valve and guiding groove
The setting of position, control unit to the control opportunity of solenoid valve, when engine is in different operating conditions, control unit can
It is flexible to accurately control spool, the shallow guide portion pair of the recessed deep guiding groove and protrusion of the spool (spool pin) and guiding groove of stretching
It should cooperate, to drive in cam sleeve rotation process in spool cam axle, spool can act on deep guiding groove and shallowly draw
The different location in portion is led, because deep guiding groove and shallow guide portion are curved surface, in this way, spool acts on deep guiding groove or shallow guide portion
Different location when, will drive cam sleeve relative to camshaft move axially.Spool acts on deep guiding groove or shallow guidance
In portion, it will be able to realize the function of driving cam sleeve to slide or slide to the right to the left.In this way, in engine development process,
By the way that control strategy is arranged in control unit, it will be able under the different operating conditions of engine, so that cam sleeve is to not Tongfang
It moves in the axial direction, so that the high cam of engine or low cam work alternatively, so that engine works under optimum condition always.
And deep guiding groove includes deep guiding groove straight line groove portion I, deep guiding groove curve groove portion, deep guiding groove straight line groove portion II, shallow guide portion
Including shallow guide portion straight line portion I, shallow guide portion curve part, deep guiding groove is the curve form along cam sleeve one week arrangement, shallowly
Guide portion is the curve form along cam sleeve one week arrangement, when spool acts on the different parts of guiding groove, it will be able to side
Just fast push cam sleeve relative to cam shaft to moving to left or move to right.Internal combustion engine two-stage variable valve liter of the present invention
Journey mechanism is capable of the adjusting of the convenient and reliable relative position for realizing camshaft and cam sleeve, realizes the two of valve stroke cam
Grade adjustment, it is ensured that internal combustion engine can work at the moment under optimum condition, reduce oil consumption, improve performance, be conducive to save the energy.
Detailed description of the invention
Brief description is made to content expressed by each attached drawing of this specification and the label in figure below:
Fig. 1 is the structural schematic diagram of internal combustion engine two-stage variable air valve lift range mechanism of the present invention；
Fig. 2 is that internal combustion engine two-stage variable air valve lift range mechanism of the present invention is cut from high cam state to low cam state
Structural schematic diagram when changing；
Fig. 3 is that internal combustion engine two-stage variable air valve lift range mechanism of the present invention is cut from low cam state to high cam state
Structural schematic diagram when changing；
Fig. 4 is that (guiding groove includes deep guidance for the guiding groove of internal combustion engine two-stage variable air valve lift range mechanism of the present invention
Slot and shallow guide portion) deployed configuration schematic diagram；
Attached drawing acceptance of the bid note is respectively as follows: 1, camshaft；2, cam sleeve；3, solenoid valve；4, high cam；5, low cam；6, valve
Core；7, deep guiding groove；8, shallow guide portion；11, deep guiding groove straight line groove portion；12, deep guiding groove curve groove portion；13, deep guiding groove
Straight line groove portion II；14, shallow guide portion straight line groove portion I；15, shallow guide portion curve groove portion；16, deep guiding groove guide surface I；17, deep
Guiding groove guide surface II；18, shallow guide portion guide surface.
Specific embodiment
Below against attached drawing, by the description of the embodiment, to for example related each structure of a specific embodiment of the invention
The works such as the shape of part, construction, the mutual alignment between each section and connection relationship, the effect of each section and working principle are further
Detailed description:
As shown in attached drawing 1- attached drawing 4, the present invention is a kind of internal combustion engine two-stage variable air valve lift range mechanism, the internal combustion engine
Two-stage variable air valve lift range mechanism includes camshaft 1, cam sleeve 2, solenoid valve 3, multiple cams portion is arranged on camshaft 1, often
Group cam part respectively includes one high cam 4 and a low cam 5, and 2 movable set of cam sleeve is on camshaft 1, solenoid valve 3
Upper setting spool 6, solenoid valve 3 connect with the control unit for capableing of the flexible switching of control valve core 6, are arranged on cam sleeve 2 recessed
Deep guiding groove 7 and protrusion shallow guide portion 8, the distance of deep 7 bottom surface of guiding groove to 1 center line of camshaft, which is set smaller than, shallowly draws
8 bottom surface of portion is led to the distance of 1 center line of camshaft, deep guiding groove 7 includes deep guiding groove straight line groove portion I 11, deep guiding groove curve
Groove portion 12, deep guiding groove straight line groove portion II 13, shallow guide portion 8 includes shallow guide portion straight line portion I 14, shallow guide portion curve part 15.
Cooperation and the guiding groove of the guiding groove on cam sleeve is arranged in by camshaft, cam sleeve, solenoid valve in above structure
Groove face move towards setting, the position of the spool of solenoid valve and guiding groove, control unit are set to control opportunity of solenoid valve
It sets, when engine is in different operating conditions, control unit (Engine ECU) can accurately control spool and stretch, the spool of stretching
The recessed deep guiding groove 7 of (spool pin) and guiding groove and 8 corresponding matching of shallow guide portion of protrusion, thus in cam axle band
In moving cam sleeve rotation process, spool can act on the different location of deep guiding groove 7 and shallow guide portion 8, because of deep guiding groove 7
It is curved surface with shallow guide portion 8, in this way, will be guided convex when spool acts on deep guiding groove 7 or the shallowly different location of guide portion 8
Wheel sleeve is moved axially relative to camshaft.Spool acts in deep guiding groove 7 or shallow guide portion 8, it will be able to realize that drive is convex
The function that wheel sleeve slides to the left or slides to the right.In this way, being controlled in engine development process by being arranged in control unit
System strategy, it will be able under the different operating conditions of engine, so that cam sleeve is moved axially to different directions, so that engine
High cam or low cam work alternatively, so that engine works under optimum condition always.And deep guiding groove 7 includes deep guiding groove
Straight line groove portion I, deep guiding groove curve groove portion, deep guiding groove straight line groove portion II, shallow guide portion 8 includes shallow guide portion straight line portion I, shallow
Guide portion curve part, in this way, deep guiding groove 7 is the curve form along cam sleeve one week arrangement, shallow guide portion 8 is along cam sleeve
The curve form of one week arrangement of cylinder, when spool acts on the different parts of guiding groove, it will be able to convenient and efficient promotion cam sleeve
Cylinder is relative to cam shaft to moving to left or move to right.Internal combustion engine two-stage variable air valve lift range mechanism of the present invention, structure is simple,
It is capable of the adjusting of the convenient and reliable relative position for realizing camshaft and cam sleeve, realizes the two-stage adjustment of valve stroke cam,
Ensure that internal combustion engine can work at the moment under optimum condition, reduce oil consumption, improve performance, is conducive to save the energy.
The deep guiding groove 7 includes deep guiding groove guide surface I 16 and deep guiding groove guide surface II 17, the shallow guidance
Portion 8 includes shallow guide portion guide surface 18.The deep guiding groove straight line groove portion I 11 of the deep guiding groove 7 of the cam sleeve 2 is drawn with deep
Guide groove straight line groove portion II 13 is arranged in parallel, the deep guiding groove straight line groove portion I 11 of deep guiding groove 7 and the shallow guide portion of shallow guide portion 8
Straight line portion I 14 is arranged in parallel；Shallow 15 one end of guide portion curve part and shallow guide portion straight line portion I 14 1 of the shallow guide portion 8
End connection, shallow 15 other end of guide portion curve part are configured to extend close to the knot of deep I 11 position of guiding groove straight line groove portion
Structure.Above structure is limited by the shape and position positioned opposite of the different guide surfaces to deep guiding groove 7 and shallow guide portion 8
It is fixed, different guide surfaces are reliably cooperated with spool, realize the accurate control of sliding.
The spool 6 of the solenoid valve 3 includes high-order stretching stroke and low level stretches out stroke, and a high position is stretched out stroke and is set as
Greater than the structure that low level stretches out stroke, the internal combustion engine two-stage variable air valve lift range mechanism is from high cam state to low cam-like
When state switches, control unit is configured to control valve core 3 according to the high-order structure stretching out stroke and stretching out, the internal combustion engine two-stage
When variable air valve lift range mechanism switches from low cam state to high cam state, control unit be configured to control valve core 3 by
The structure that stroke stretches out is stretched out according to low level.The half of the spool 6 of the solenoid valve 3 of the internal combustion engine two-stage variable air valve lift range mechanism
Diameter is R, and the distance of the deep guiding groove straight line groove portion I 11 and shallow guide portion straight line portion I 14 is sized to R+R+h, described
Deep guiding groove straight line groove portion II 13 and the distance of shallow guide portion straight line portion I 14 be sized to R+R.
The deep guiding groove curve groove portion 12 of the deep guiding groove 7 of the internal combustion engine two-stage variable air valve lift range mechanism is set as
It can be set to the structure of the recessed arrangement in deep 9 direction of guiding groove external position, the shallow guide portion curve part 15 of the shallow guide portion 8
Being set to can be to the structure of the recessed arrangement in shallow 10 direction of guide portion external position.Above structure, to deep guiding groove curve groove portion 12
It is defined with the protrusion direction of shallow guide portion curve part 15, in this way, further accurately being limited the curve form of guide surface
It is fixed, improve the overall accuracy that engine works in different operating conditions.
When the internal combustion engine two-stage variable air valve lift range mechanism switches from high cam state to low cam state, control unit
Part is configured to control solenoid valve 3 and is powered, so that control valve core 6 is according to the high-order structure stretching out stroke and stretching out, control unit
When control valve core 6 stretches out stroke stretching according to a high position, the cam sleeve 2 is configured to the turning effort in camshaft 1
Under, guide spool 6 stretches out the structure for snapping fitted to deep I 11 position of guiding groove straight line groove portion of deep guiding groove 7, and spool 6, which stretches out, to be clamped
When to deep guiding groove straight line I 11 position of groove portion of deep guiding groove 7, under the turning effort of camshaft 1, spool 6 is configured to
Exert a force the structure for pushing cam sleeve 2 axially to slide h distance to the left relative to camshaft 1 in deep guiding groove guide surface I 16, valve
The force of core 6 pushes cam sleeve 2 relative to camshaft 1, and for axial sliding h after, control unit is configured to control valve to the left
Core 6 is retracted to the structure of original state.As shown in Fig. 2, solenoid valve 3 is powered, the stretching high-stroke of control valve core 2, cam sleeve, and 2
Under the turning effort of camshaft 1, deep guiding groove is contacted with spool, and under the action of spool, cam sleeve and camshaft are generated
Axial left sliding, moving distance h.As shown in Fig. 3, the pin of spool moves to position b from position a, in this way, just completing low
Switching of the cam to high cam.After completing switching, spool A is returned to the initial position before stretching out under control unit control.
When the internal combustion engine two-stage variable air valve lift range mechanism switches from low cam state to high cam state, control unit
Part is configured to control solenoid valve 3 and is powered, so that control valve core 6 stretches out the structure of stroke, control unit control according to low level
Spool 6 according to low level stretch out stroke when, cam sleeve 2 is configured under the turning effort of camshaft 1, guide spool 6 with
The structure of shallow guide portion guide surface 18 contact of shallow guide portion 8, spool 6 are contacted with the shallow guide portion guide surface 18 of shallow guide portion 8
When, under the turning effort of camshaft 1, the spool 6 is configured to force and pushes cam sleeve 2 relative to camshaft 1
The axial structure for sliding h distance to the right, the force of spool 6 push cam sleeve 2 axially to slide h distance to the right relative to camshaft 1
Afterwards, control unit is configured to the structure that control valve core 6 is retracted to original state.Above structure, when needing to carry out high cam
To low cam switching when, solenoid valve control spool stretch out low row journey, shown in appended Fig. 3, rotation of the cam sleeve in camshaft
Under effect, raised shallow guide portion is contacted with spool, and under the action of spool, cam sleeve and camshaft generate axial right cunning
It moves, the pin of moving distance h, spool move to position b from position c, complete the switching of high cam to low cam, and the force of spool 6 pushes away
After moving cam sleeve 2 is relative to the axial h distance of sliding to the right of camshaft 1, control unit can control valve core 6 be retracted to initial shape
The structure of state.
The guiding groove 8 is helicla flute or scarf.
Spool return mechanism is set in the solenoid valve 3, and spool return mechanism is spring, electromagnet suction, permanent magnet
One of suction.In this way, realizing the reliable return of spool.
Internal combustion engine two-stage variable air valve lift range mechanism of the invention, after cam sleeve slides to the left or slides in place to the right,
Control unit controls spacer pin and stretches out, and in limit shaft inserting to the correspondence limiting slot on cam sleeve, realizes that cam sleeve is axial
Limit.When state being needed to switch, control unit controls spacer pin contraction in advance, releases axial limiting.Then, in the convex of engine
After wheel sleeve slides again, spacer pin can be inserted again in another corresponding limiting slot, limited again.
Internal combustion engine two-stage variable air valve lift range mechanism of the invention, the depth guide structure on cam sleeve is compact-sized,
Curved surface is unique, has many advantages, such as that processing cost is low, axial distance is small.Structure of the invention is to be overlapped helicla flute, significantly
Shorten the distance of axial demand.
Internal combustion engine two-stage variable air valve lift range mechanism of the present invention, by camshaft, cam sleeve, solenoid valve, if
The groove face of the cooperation and guiding groove of setting the guiding groove on cam sleeve moves towards setting, the spool of solenoid valve and guiding groove
The setting of position, control unit to the control opportunity of solenoid valve, when engine is in different operating conditions, control unit can
It is flexible to accurately control spool, the shallow guide portion pair of the recessed deep guiding groove and protrusion of the spool (spool pin) and guiding groove of stretching
It should cooperate, to drive in cam sleeve rotation process in spool cam axle, spool can act on deep guiding groove and shallowly draw
The different location in portion is led, because deep guiding groove and shallow guide portion are curved surface, in this way, spool acts on deep guiding groove or shallow guide portion
Different location when, will drive cam sleeve relative to camshaft move axially.Spool acts on deep guiding groove or shallow guidance
In portion, it will be able to realize the function of driving cam sleeve to slide or slide to the right to the left.In this way, in engine development process,
By the way that control strategy is arranged in control unit, it will be able under the different operating conditions of engine, so that cam sleeve is to not Tongfang
It moves in the axial direction, so that the high cam of engine or low cam work alternatively, so that engine works under optimum condition always.
And deep guiding groove includes deep guiding groove straight line groove portion I, deep guiding groove curve groove portion, deep guiding groove straight line groove portion II, shallow guide portion
Including shallow guide portion straight line portion I, shallow guide portion curve part, deep guiding groove is the curve form along cam sleeve one week arrangement, shallowly
Guide portion is the curve form along cam sleeve one week arrangement, when spool acts on the different parts of guiding groove, it will be able to side
Just fast push cam sleeve relative to cam shaft to moving to left or move to right.Internal combustion engine two-stage variable valve liter of the present invention
Journey mechanism is capable of the adjusting of the convenient and reliable relative position for realizing camshaft and cam sleeve, realizes the two of valve stroke cam
Grade adjustment, it is ensured that internal combustion engine can work at the moment under optimum condition, reduce oil consumption, improve performance, be conducive to save the energy.
Above in conjunction with attached drawing, an exemplary description of the invention, it is clear that concrete implementation of the present invention is not by above-mentioned
The limitation of mode, as long as using the various improvement that the inventive concept and technical scheme of the present invention carry out, or not improved by this
The conception and technical scheme of invention directly apply to other occasions, are within the scope of the invention.
Claims (10)
1. a kind of internal combustion engine two-stage variable air valve lift range mechanism, it is characterised in that: the internal combustion engine two-stage variable valve stroke
Mechanism includes camshaft (1), cam sleeve (2), solenoid valve (3), and multiple cams portion, every group of cam part is arranged on camshaft (1)
One high cam (4) and a low cam (5) are respectively included, cam sleeve (2) movable set is on camshaft (1), solenoid valve
(3) spool (6) are set on, solenoid valve (3) is connect with the control unit for capableing of the flexible switching of control valve core (6), cam sleeve (2)
The shallow guide portion (8) of upper setting recessed deep guiding groove (7) and protrusion, deep guiding groove (7) bottom surface to camshaft (1) center line
Distance is set smaller than shallow guide portion (8) bottom surface to the distance of camshaft (1) center line, and deep guiding groove (7) includes deep guiding groove
Straight line groove portion I (11), deep guiding groove curve groove portion (12), deep guiding groove straight line groove portion II (13), shallow guide portion (8) include shallowly drawing
Lead portion straight line portion I (14), shallow guide portion curve part (15).
2. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1, it is characterised in that: the deep guiding groove
It (7) include deep guiding groove guide surface I (16) and deep guiding groove guide surface II (17), the shallow guide portion (8) includes shallow guidance
Portion's guide surface (18).
3. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1 or 2, it is characterised in that: the cam
The deep guiding groove straight line groove portion I (11) of the deep guiding groove (7) of sleeve (2) and deep guiding groove straight line groove portion II (13) are arranged in parallel,
The deep guiding groove straight line groove portion I (11) of deep guiding groove (7) and the shallow guide portion straight line portion I (14) of shallow guide portion (8) are arranged in parallel；
Shallow guide portion curve part (15) one end of the shallow guide portion (8) is connected to shallow guide portion straight line portion I (14) one end, shallow to guide
Portion's curve part (15) other end is configured to extend close to the structure of deep I (11) position of guiding groove straight line groove portion.
4. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1 or 2, it is characterised in that: the electromagnetism
The spool (6) of valve (3) includes that a high position stretches out stroke and low level stretching stroke, and a high position stretches out stroke and is set greater than low level stretching row
The structure of journey, when the internal combustion engine two-stage variable air valve lift range mechanism switches from high cam state to low cam state, control
Component is configured to control valve core (3) according to the high-order structure stretching out stroke and stretching out, the internal combustion engine two-stage variable valve liter
When journey mechanism switches from low cam state to high cam state, control unit is configured to control valve core (3) and stretches according to low level
The structure that stroke stretches out out.
5. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1 or 2, it is characterised in that: the internal combustion
The radius of the spool (6) of the solenoid valve (3) of machine two-stage variable air valve lift range mechanism is R, the deep guiding groove straight line groove portion I
(11) and the distance of shallow guide portion straight line portion I (14) is sized to R+R+h, the deep guiding groove straight line groove portion II (13) and
The distance of shallow guide portion straight line portion I (14) is sized to R+R.
6. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1 or 2, it is characterised in that: the internal combustion
The deep guiding groove curve groove portion (12) of the deep guiding groove (7) of machine two-stage variable air valve lift range mechanism is configured to deep guiding groove
The structure of the recessed arrangement in external position (9) direction, the shallow guide portion curve part (15) of the shallow guide portion (8) are configured to
To the structure of the recessed arrangement in shallow guide portion external position (10) direction.
7. internal combustion engine two-stage variable air valve lift range mechanism according to claim 3, it is characterised in that: the internal combustion engine two
When grade variable air valve lift range mechanism switches from high cam state to low cam state, control unit is configured to control solenoid valve
(3) it is powered, so that control valve core (6) is according to the high-order structure stretching out stroke and stretching out, control unit control valve core (6) is according to a high position
When stretching out stroke stretching, the cam sleeve (2) is configured under the turning effort of camshaft (1), guide spool (6)
Stretching snaps fitted to the structure at deep I (11) position of guiding groove straight line groove portion of deep guiding groove (7), and spool (6) stretching snaps fitted to deep draw
When deep I (11) position of guiding groove straight line groove portion of guide groove (7), under the turning effort of camshaft (1), spool (6) is arranged to
Enough forces push cam sleeve (2) axially to slide h distance to the left relative to camshaft (1) on deep guiding groove guide surface I (16)
Structure, spool (6) force push cam sleeve (2) relative to camshaft (1) to the left axial sliding h distance after, control unit
It is configured to the structure that control valve core (6) is retracted to original state.
8. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1, it is characterised in that: the internal combustion engine two
When grade variable air valve lift range mechanism switches from low cam state to high cam state, control unit is configured to control solenoid valve
(3) it is powered, so that control valve core (6) stretches out the structure of stroke according to low level, control unit control valve core (6) is stretched out according to low level
When stroke, cam sleeve (2) is configured under the turning effort of camshaft (1), guide spool (6) and shallow guide portion (8)
The contact of shallow guide portion guide surface (18) structure, spool (6) contacts with the shallow guide portion guide surface (18) of shallow guide portion (8)
When, under the turning effort of camshaft (1), the spool (6) is configured to force and pushes cam sleeve (2) relative to convex
The axial structure for sliding h distance to the right of wheel shaft (1), spool (6) force push cam sleeve (2) axial relative to camshaft (1)
To the right after sliding h distance, control unit is configured to the structure that control valve core (6) is retracted to original state.
9. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1 or 2, it is characterised in that: the guidance
Slot (8) is helicla flute or scarf.
10. internal combustion engine two-stage variable air valve lift range mechanism according to claim 1 or 2, it is characterised in that: the electromagnetism
Spool return mechanism is set in valve (3), and spool return mechanism is one of spring, electromagnet suction, attraction of permanent magnet.
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| CN201910386182.3A CN110159386B (en) | 2019-05-09 | 2019-05-09 | Two-stage variable valve lift mechanism of internal combustion engine |
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| CN112761751A (en) * | 2020-12-03 | 2021-05-07 | 杰锋汽车动力系统股份有限公司 | Variable valve lift mechanism of internal combustion engine |
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|---|---|
| CN110159386B (en) | 2020-08-04 |
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