CN108049928A - A kind of twin cam shaft becomes Stroke Engine distribution switching mechanism - Google Patents
A kind of twin cam shaft becomes Stroke Engine distribution switching mechanism Download PDFInfo
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- CN108049928A CN108049928A CN201710995432.4A CN201710995432A CN108049928A CN 108049928 A CN108049928 A CN 108049928A CN 201710995432 A CN201710995432 A CN 201710995432A CN 108049928 A CN108049928 A CN 108049928A
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- tappet
- valve
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- interior
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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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/022—Chain drive
-
- 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
- F01L1/026—Gear drive
-
- 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
- F01L1/053—Camshafts overhead type
-
- 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
- F01L1/08—Shape of cams
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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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/143—Tappets; Push rods for use with overhead 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
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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
- F01L1/36—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle
- F01L1/38—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle for engines with other than four-stroke cycle, e.g. with two-stroke cycle
-
- 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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
- F02B69/06—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different cycles, e.g. convertible from two-stroke to four stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
-
- 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
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
-
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
- F01L2001/256—Hydraulic tappets between cam and push rod
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
A kind of twin cam shaft becomes Stroke Engine distribution switching mechanism, is secondary transmission, and power is passed to no hill single camshaft transmission gear by bent axle by chain, drives no hill single camshaft by first order transmission；Power is delivered separately to admission cam shaft and exhaust cam shaft by second level transmission by idle pulley by no hill single camshaft, admission cam shaft drives inlet valve to act by the changeable tappet of air inlet, inlet valve carries out return by inlet-valve spring, and the changeable tappet of air inlet passes through tappet return spring return；Exhaust cam shaft drives exhaust valve actuation by being vented changeable tappet, and exhaust valve carries out return by exhaust valve spring, is vented changeable tappet and passes through tappet return spring return.The present invention is small to the change of former machine, and the mutual conversion of two, four-stoke mode can be realized by only changing the tappet in valve actuating mechanism and camshaft；Overall structure simple and compact, stable and reliable in work, switching mechanism service life is longer；Switching power source need not be additional, and cost is lower.
Description
Technical field
The present invention relates to a kind of engine strokes switching mechanisms.
Background technology
Passenger car and motorcycle engine under present technical conditions mainly have two kinds of working forms of four strokes and two-stroke,
But both engines have respective superiority and inferiority, and the economy of four-stroke engine is better than two stroke engine, and power
Property it is poor compared with two stroke engine, if four-stroke engine and two stroke engine are integrated in a change Stroke Engine
On, it is allowed to run different stroke modes under different operating modes, then an engine can be made to have both the power of two stroke engine
Property and four-stroke economy.
United States Patent (USP) Two-stroke and Four-stroke Switching Mechanism, patent No. US7036-
465B2 discloses a kind of stroke switching mechanism for becoming Stroke Engine, uses the form of double rocking arms, is integrated on rocker arm shaft
There are four stroke operation pattern rocking arms and two stroke operation pattern rocking arm, have connecting component among the two, have among three for two
The centre bore of a switching pin movement, switching pin work under the action of oil pressure, and when needing four stroke operation patterns, four strokes shake
Arm switching pin enters work, and four stroke rocking arms and intermediate member are connected as a single entity, while two-stroke rocking arm and intermediate member separation,
Enter four stroke operation patterns at this time；When needing two stroke operation pattern, two-stroke rocking arm switching pin enters work, Jiang Erchong
Journey rocking arm and intermediate member are connected as a single entity, while four stroke rocking arms and intermediate member separation, at this time into two stroke operation pattern.
The mechanism can realize the mutual switching between different working modes, but bigger to the change of former machine, and camshaft and rocking arm are all
Be improved, and stringenter to the control of switching time requirement, control program and oil pressure, oil temperature small-scale fluctuation all
The error in judgement of switching time is likely to result in, switching is caused to have some setbacks.
University On The Mountain Of Swallows's summer bosom into etc. disclose it is a kind of change Stroke Engine switching mechanism, application publication number
CN103216323A, switching mechanism are connected by dive key using camshaft and the form of cam body split, the two, realized
Cam body circumferentially rotating and moving axially with camshaft, cam body use the combining form of cam sheet body, handoff procedure
Realize by the switching boss at electromagnetic driver and cam body both ends, electromagnetic driver and cam body in handoff procedure
Contact force it is bigger, be easy to cause the damage of part, using the link form of flat key, peripheral force is all concentrated on flat key,
The damage of flat key is be easy to cause, so as to reduce the service life of switching mechanism.
The content of the invention
Small, reliable operation, compact-sized, highly practical biconvex are changed to former machine it is an object of the invention to provide one kind
Wheel shaft becomes Stroke Engine distribution switching mechanism.The present invention is mainly based on existing single camshaft drive form, by original
There is single camshaft to remove cam portion, be processed into gear shaft；Driving cog is machined on Dual Over Head Camshaft, is done in former single camshaft
Into gear shaft and Dual Over Head Camshaft between increase arrangement idle pulley, realize power transmission.
Particular content of the present invention is as follows：
The invention mainly comprises：Inlet and outlet camshaft, inlet and outlet cam wheel, no hill single camshaft transmission gear,
Without hill single camshaft, transition gear, idle pulley, two, four stroke inlet and outlet cams, changeable tappet, tappet return spring, into,
Exhaust valve spring and inlet and exhaust valve.Wherein, its center without hill single camshaft transmission gear being connected by chain with bent axle leads to
Be equipped in hole it is cylindrical without hill single camshaft, this without being additionally provided with transition gear on hill single camshaft, the transition gear with it is lazy
Wheel is meshed, which is meshed respectively with admission cam gear and exhaust cam gear, and inlet and outlet cam wheel
Axis using idle pulley axis be symmetrical, wherein being located at into (going out) gas cam wheel on (going out) gas camshaft, into (going out) gas cam
Axis is located at by rolling bearing in the bearing block of cylinder cap towards no hill single camshaft transmission gear one end, into (going out) gas camshaft
The other end is located at by sliding bearing in the bearing block of cylinder cap.It is convex into arranged side by side two groups are additionally provided on (going out) gas camshaft at this
Wheel, every group of cam are 3, best overall processing shaping, and intermediate cam is four strokes into the unimodal cam of (going out) gas, and both sides cam is
Two-stroke is into (going out) gas double peak cam, and every group of cam is respectively corresponding with a changeable tappet upper end, i.e., four stroke admissions are unimodal convex
Wheel is corresponding with interior tappet, and two two-stroke air inlet double peak cams are corresponding with outer tappet respectively.The outer tappet of the hollow circuit cylinder bodily form is wherein
Portion sets the excessively outer tappet axis of axis and perpendicular two coaxial radial through-hole i.e. lock pin slideway, in lock pin slideway outside
The opening of circumferential surface is equipped with the open slot that diameter is more than lock pin slideway, and an internal diameter is respectively set in each slot less than lock pin slideway diameter
Spacing ring.The outer tappet bottom is adjacent with tappet return spring upper end, which is placed in annular tappet and returns
On the spring base of position.Intermediate tappet corresponding with its internal diameter is set in outer tappet, the intermediate tappet is recessed for the tapered upper opening in bottom
Slot, and the groove-bottom is corresponding with the lower frusto-conical surface of outer tappet convex, and the cell wall above the intermediate tappet is equipped with to be endured with outer
Corresponding two radial through-hole of two lock pin slideway of column, that is, lock pin slideway.Intermediate tappet lower end top is with being located at tappet return spring and tappet
Valve lifter upper end between return spring seat is connected.The gasket adjusted for valve clearance is preferably equipped between the two.The gas
Stile bar lower end is connected with inlet valve or exhaust valve.Tappet return spring seat is connected with following cotter seat, the valve bullet
Spring abutment is connected with valve spring upper end, which is located on another cotter seat, another cotter seat with
Valve guide bushing upper end is connected, and valve top is connected through valve guide bushing, valve spring and cotter seat end top with valve lifter.
Tappet in cylindrical corresponding with its internal diameter is equipped in intermediate tappet, top is in the truncated cone, peripheral hardware interior shape and size
Corresponding interior tappet spacing ring, which sets screw thread, straight with being located at opening on intermediate tappet
Footpath is more than the threaded connection on the open slot peripheral wall of intermediate tappet internal diameter.Interior tappet bottom is adjacent with return spring upper end, return
Lower spring end is placed in intermediate tappet groove-bottom.The excessively interior tappet axis of axis and perpendicular radial through-hole are set in the middle part of interior tappet
That is lock pin slideway, both ends open are corresponding with two lock pin slideways of intermediate tappet and outer tappet respectively.In outer tappet, intermediate tappet
And 3 switching lock pins are equipped in the lock pin slideway of interior tappet, and the switching lock pin length being located in interior tappet and interior tappet are straight
Footpath is isometric, and in addition two switching lock pin length are equal to outer tappet wall thickness and left side spacing ring difference in height.Lock pin on outer tappet is slided
Road forms hydraulic cavities with cylinder block, and lube system pressure acts on lock pin by lubricating oil in hydraulic cavities, moves it.The present invention
Control hydraulic pressure come from body original lubricating system, be machined with the oil for coming from lubricating system in the cylinder head contacted with outer tappet
Road is connected with tappet lock pin slideway cavity.Lock pin is processed into couple with slideway, it is ensured that the execution pressure of cavity inner fluid.It is described
Lock pin can control hydraulic pressure to realize way moving by electromagnetic switch valve.When solenoid valve control lubricating oil fills left side hydraulic cavities
When, valve actuating mechanism performs two-stroke distribution pattern；When solenoid valve control lubricating oil fills right side hydraulic cavities, valve actuating mechanism performs
Four stroke distribution patterns.The present invention realizes that engine valve event performs cam by a kind of switching of changeable prop column structure
Switching, it is achieved thereby that the switching of valve actuating mechanism two, four-stoke mode.The separately non-periphery for setting lock pin sliding eye on interior tappet
Face is equipped with axial notch, and the stop pin vertical with interior tappet axis is equipped in slot, which endures through outer tappet and centre
The corresponding through hole of column by interior tappet and intermediate tappet and outer tappet radial direction locking, prevents its relative rotation, it is ensured that lock pin slideway is same
Axis.
The present invention has the following advantages that compared with prior art：
1. small to former machine change, four-stoke mode can be realized by only changing the tappet in valve actuating mechanism and camshaft
With the mutual conversion of two stroke operation pattern；
2. overall structure simple and compact, stable and reliable in work, switching mechanism service life is longer；
3. switching power source need not be additional, directly switching is realized by existing lubricating system pressure in engine；
4. overall processing can be used in camshaft, number of parts is reduced, design is easy to process, and cost is lower.
5. the initial design values of single stroke valve timing are not changed.
Description of the drawings
Fig. 1 is schematic front view of the present invention；
Fig. 2 is left view schematic diagram of the present invention；
Fig. 3 is the main view diagrammatic cross-section for switching tappet in the present invention under two-stroke mode；
Fig. 4 is the main view diagrammatic cross-section for switching tappet in the present invention under four-stoke mode；
Fig. 5 is the left view diagrammatic cross-section of interior tappet in the present invention；
Fig. 6 is the hydraulic control schematic diagram of the present invention.
In figure：1st, admission cam shaft, 2, the changeable tappet of air inlet, 3, tappet return spring, 4, inlet-valve spring, 5, air inlet
Door conduit, 6, inlet valve, 7, without hill single camshaft, 8, without hill single camshaft transmission gear, 9, exhaust valve, 10, exhaust valve
Conduit, 11, exhaust valve spring, 12, tappet return spring, 13, the changeable tappet of exhaust, 14, exhaust cam shaft, 15, idle pulley,
16th, two-stroke air inlet double peak cam, 17, the four unimodal cams of stroke admission, 18, interior tappet, 19, interior tappet spacing ring, 20, /V
Ring, 21, switching lock pin, 22, switching lock pin, 23, gasket, 24, valve lifter, 25, return spring seat, 26, transition gear, 27,
Return spring, 28, intermediate tappet, 29, switching lock pin, 30, spacing ring, 31, outer tappet, 32, stop pin, 33, right-side switch valve,
34th, left-side switch valve, 35, right side hydraulic cavities, 36, left side hydraulic cavities.
Specific embodiment
Become in Fig. 1 and a kind of twin cam shaft shown in Fig. 2 in the schematic diagram of Stroke Engine distribution switching mechanism, pass through chain
Item is connected cylindrical without hill single camshaft 7 without being equipped in 8 its central through hole of hill single camshaft transmission gear with bent axle, should
Be additionally provided with transition gear 26 on no hill single camshaft, which is meshed with idle pulley 15, the idle pulley both sides respectively with
Admission cam gear and exhaust cam gear are meshed, and the axis of inlet and outlet cam wheel using idle pulley axis be it is symmetrical,
Middle admission cam gear is located on admission cam shaft 1, and exhaust cam gear is located on exhaust cam shaft 14, into (row) gas camshaft
It is located at towards no hill single camshaft transmission gear one end by rolling bearing in the bearing block of cylinder cap, it is another into (row) gas camshaft
One end is located at by sliding bearing in the bearing block of cylinder cap.It is additionally provided with two groups of cams arranged side by side on the admission cam shaft, every group
Cam is 3, and overall processing shaping, intermediate cam is the unimodal cam 17 of four stroke admissions, and both sides cam is double for two-stroke air inlet
Peak cam 16, every group of cam is respectively corresponding with changeable 2 upper end of tappet of an air inlet, i.e. the unimodal cam of four stroke admissions and interior tappet
18 correspond to, and two two-stroke air inlet double peak cams are corresponding with outer tappet 31 respectively；It is additionally provided on the exhaust cam shaft arranged side by side
Two groups of cams, every group of cam are 3, overall processing shaping, and intermediate cam is vented unimodal cam for four strokes, and both sides cam is two
Stroke is vented double peak cam, and every group of cam is respectively corresponding with changeable 13 upper end of tappet of exhaust, i.e. four strokes exhaust is unimodal convex
Wheel is corresponding with interior tappet 18, and two two-stroke exhaust double peak cams are corresponding with outer tappet 31 respectively, as shown in Figure 3 and Figure 4, hollow
Its middle part of the outer tappet of cylindrical sets the excessively outer tappet axis of axis and perpendicular two coaxial radial through-hole i.e. lock pin is slided
Road is equipped with the open slot that diameter is more than lock pin slideway in opening of the lock pin slideway towards outer circumferential surface, one is respectively set in each slot
Internal diameter is less than the spacing ring 20,30 of lock pin slideway diameter.The outer tappet bottom is adjacent with 3 or 12 upper end of tappet return spring, should
Tappet return spring lower end is placed on annular tappet return spring seat 25.Intermediate tappet corresponding with its internal diameter is set in outer tappet
28, which is the tapered upper open recess in bottom, and the groove-bottom is opposite with the lower frusto-conical surface of outer tappet convex
Should, the cell wall above the intermediate tappet is equipped with two radial through-hole, that is, lock pin slideway corresponding with outer two lock pin slideway of tappet.In
Between tappet lower end top be connected with 24 upper end of valve lifter between return spring 27 and tappet return spring seat 25, between the two
Equipped with gasket 23.The valve lifter lower end is connected with inlet valve 6 or exhaust valve 9.It is equipped in intermediate tappet corresponding with its internal diameter
Cylindrical in tappet 18, top is in the truncated cone, peripheral hardware interior shape and the corresponding interior tappet spacing ring 19 of size,
The interior tappet spacing ring outer circumferential surface sets screw thread, and the opening of intermediate tappet internal diameter is more than with being located at opening diameter on intermediate tappet
Threaded connection on slot peripheral wall.Interior tappet bottom is adjacent with 27 upper end of return spring, and 27 lower end of return spring is placed in intermediate tappet
In groove-bottom.The excessively interior tappet axis of axis is set in the middle part of interior tappet and perpendicular radial through-hole i.e. lock pin slideway, both ends are opened
Mouth is corresponding with two lock pin slideways of intermediate tappet and outer tappet respectively.In the lock pin slideway of outer tappet, intermediate tappet and interior tappet
3 switching lock pins 21,22,29 are inside equipped with, and 21 length of switching lock pin being located in interior tappet and interior tappet diameter are isometric, separately
Outer switching lock pin 22,29 length are equal to 30 difference in height of outer tappet wall thickness and spacing ring.The lock pin can pass through electromagnetic switch valve
Hydraulic pressure is controlled to realize way moving.As shown in fig. 6, the solenoid valve being connected with electronic control unit is connected with lubricating oil system again, work as electricity
When 34 control lubricating oil of magnet valve opening left-side switch valve fills left side hydraulic cavities 36, valve actuating mechanism performs two-stroke distribution pattern；
When solenoid valve opens right-side switch valve 33, and lubricating oil is controlled to fill right side hydraulic cavities 35, valve actuating mechanism performs four stroke distribution moulds
Formula.
Again in fig. 1 and 2, air inlet tappet return spring seat 3 is connected with following cotter seat, the cotter seat
Be connected with 4 upper end of inlet-valve spring, which is located on another cotter seat, another cotter seat with
5 upper end of inlet valve conduit is connected, and inlet valve top is pushed up through valve guide bushing, valve spring and cotter seat end and valve lifter
It is connected.Exhaust tappet return spring seat 12 is connected with following exhaust valve spring base, the exhaust valve spring base and exhaust valve spring
11 upper ends are connected, which is located on another exhaust valve spring base, another exhaust valve spring base and exhaust valve
10 upper end of conduit is connected, and 9 top of exhaust valve is pushed up through valve guide bushing, valve spring and cotter seat end and valve lifter phase
Even.
It is non-on interior tappet to set lock pin sliding eye in the present invention shown in Fig. 5 in the left view diagrammatic cross-section of interior tappet
Outer circumferential surface be equipped with axial notch, the stop pin 32 vertical with interior tappet axis is equipped in slot, which passes through outer tappet
And the corresponding through hole of centre tappet.
The present invention the course of work approximately as：
As depicted in figs. 1 and 2, distribution transmission mechanism is divided into secondary transmission, and first order transmission is by chain by power by song
Axis passes to no hill single camshaft transmission gear 8, drives no hill single camshaft 7；Second level transmission will be dynamic by idle pulley 15
Power is delivered separately to admission cam shaft 1 and exhaust cam shaft 14 by no hill single camshaft 7, and admission cam shaft 1 can by air inlet
Switching tappet 2 drives inlet valve 6 to act, and inlet valve carries out return by inlet-valve spring 4, and the changeable tappet 2 of air inlet passes through very
3 return of column return spring；Exhaust cam shaft 14 drives exhaust valve 9 to act by being vented changeable tappet 13, and exhaust valve passes through row
Valve spring 11 carries out return, is vented changeable tappet 13 and passes through 12 return of tappet return spring.
Air inlet switching mechanism is illustrated in figure 3, exhaust switching mechanism structure is same, is machined on admission cam shaft 1
Two-stroke air inlet double peak cam 16 and the unimodal cam 17 of four stroke admissions；The changeable tappet 2 of air inlet is mainly by interior tappet 18, centre
Tappet 28, outer tappet 31 and switching lock pin 21,22,29 form, and the moving displacement for switching lock pin passes through spacing ring 20 and /V
Ring 30 is limited, and interior tappet spacing ring 19 is connected by screw thread with intermediate tappet, make intermediate tappet under two-stroke mode with
Outer tappet moves down together, reduces unnecessary abrasion, and intermediate tappet carries out return, valve lifter 24 by tappet return spring 3
The gasket 23 adjusted for valve clearance is housed between intermediate tappet 28.Stop pin 32 as shown in Figure 5 is by outer tappet 31, intermediate
Tappet 28,18 radial direction locking of interior tappet, prevent its relative rotation, it is ensured that lock pin slideway is coaxial.
As shown in figure 3, it is in two stroke operation pattern for engine, two-stroke air inlet double peak cam 16 is in work shape
State, two-stroke air inlet double peak cam 16 drive outer tappet 31 to move, lock pin 22,29 by outer tappet 31 and intermediate 28 locking of tappet,
Intermediate tappet 28 moves to drive valve event together with outer tappet 31, realizes engine two-stroke mode；When engine is by two
When stroke mode is converted to four-stoke mode, when two-stroke double peak cam and the unimodal cam of four strokes are all in base circle position,
Electronic control unit as shown in Figure 6 sends right-side switch valve 33 power on signal, and engine lubrication system is connected with right side hydraulic cavities 35
Logical, lock pin 22 promotes lock pin 21 to move to the left under the action of lubricating system lubricating oil pressure, and lock pin 21 promotes lock pin 29 to move
To left end spacing ring 30.At this point, as shown in figure 4, the unimodal cam 17 of four stroke admissions drives interior tappet 18 to move, lock pin
21st, 22 by interior tappet 18 and 28 locking of intermediate tappet, and intermediate tappet 28 runs driving valve event together with interior tappet 18, realizes
Engine four-stoke mode.
Claims (3)
1. a kind of twin cam shaft becomes Stroke Engine distribution switching mechanism, it is characterised in that：The nothing being connected by chain with bent axle
Hill single camshaft transmission gear, the interior cylinder that is equipped with of central through hole is without hill single camshaft, this is without on hill single camshaft
Be additionally provided with transition gear, which is meshed with idle pulley, the idle pulley both sides respectively with admission cam gear and exhaust cam
Gear is meshed, and the axis of inlet and outlet cam wheel is symmetrical using idle pulley axis, wherein being located at into (going out) gas cam wheel
Into on (going out) gas camshaft, it is located at into (going out) gas camshaft towards no hill single camshaft transmission gear one end by rolling bearing
It in the bearing block of cylinder cap, is located at into (going out) gas camshaft other end by sliding bearing in the bearing block of cylinder cap, at this into (going out)
Two groups of cams arranged side by side are additionally provided on gas camshaft, every group of cam is 3, and intermediate cam is unimodal convex into (going out) gas for four strokes
Wheel, both sides cam are two-stroke into (going out) gas double peak cam, and every group of cam is respectively correspondings with a changeable tappet upper end, i.e., four rush
The unimodal cams of Cheng Jinqi are corresponding with interior tappet, and two two-stroke air inlet double peak cams are corresponding with outer tappet respectively, hollow circular cylinder
Its middle part of the outer tappet of shape sets the excessively outer tappet axis of axis and perpendicular two coaxial radial through-hole i.e. lock pin slideway, is locking
The opening for selling slideway towards outer circumferential surface is equipped with the open slot that diameter is more than lock pin slideway, and respectively setting an internal diameter in each slot is less than
The spacing ring of lock pin slideway diameter, the outer tappet bottom is adjacent with tappet return spring upper end, which puts
In on annular tappet return spring seat, intermediate tappet corresponding with its internal diameter is set in outer tappet, which is bottom in cone
The upper open recess of shape, and the groove-bottom is corresponding with the lower frusto-conical surface of outer tappet convex, the cell wall above the intermediate tappet
Two radial through-hole, that is, lock pin slideway corresponding with outer two lock pin slideway of tappet is equipped with, intermediate tappet lower end top positioned at tappet with returning
Valve lifter upper end between position spring and tappet return spring seat is connected, the valve lifter lower end and inlet valve or exhaust valve phase
Even, tappet return spring seat is connected with following cotter seat, which is connected with valve spring upper end, the valve
Lower spring end is located on another cotter seat, which is connected with valve guide bushing upper end, and valve top passes through
Valve guide bushing, valve spring and cotter seat end top are connected with valve lifter, are equipped in intermediate tappet corresponding with its internal diameter
Tappet in cylindrical, top is in the truncated cone, and peripheral hardware interior shape and the corresponding interior tappet spacing ring of size, this is interior very
Column spacing ring outer circumferential surface sets screw thread, and the open slot peripheral wall of intermediate tappet internal diameter is more than with being located at opening diameter on intermediate tappet
On threaded connection, interior tappet bottom is adjacent with return spring upper end, and return spring lower end is placed in intermediate tappet groove-bottom, interior
Set the excessively interior tappet axis of axis and perpendicular radial through-hole i.e. lock pin slideway in the middle part of tappet, both ends open respectively with centre
Two lock pin slideways of tappet and outer tappet correspond to, and 3 switchings are equipped in the lock pin slideway of outer tappet, intermediate tappet and interior tappet
Lock pin, and the switching lock pin length being located in interior tappet and interior tappet diameter are isometric, and in addition two switching lock pin length are equal to outer
Tappet wall thickness and left side spacing ring difference in height are machined with the oil duct for coming from lubricating system in the cylinder head contacted with outer tappet, with
Tappet lock pin slideway cavity is connected, and the lock pin is controlled by electromagnetic switch valve.
2. twin cam shaft according to claim 1 becomes Stroke Engine distribution switching mechanism, it is characterised in that：In interior tappet
The upper non-outer circumferential surface for setting lock pin sliding eye is equipped with axial notch, is equipped with the stop pin vertical with interior tappet axis in slot, this is anti-
It ships and resell on another market through outer tappet and the corresponding through hole of intermediate tappet.
3. twin cam shaft according to claim 1 becomes Stroke Engine distribution switching mechanism, it is characterised in that：Intermediate tappet
Lower end is equipped with gasket between the two with valve lifter upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710995432.4A CN108049928A (en) | 2017-10-23 | 2017-10-23 | A kind of twin cam shaft becomes Stroke Engine distribution switching mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710995432.4A CN108049928A (en) | 2017-10-23 | 2017-10-23 | A kind of twin cam shaft becomes Stroke Engine distribution switching mechanism |
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| CN108049928A true CN108049928A (en) | 2018-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710995432.4A Pending CN108049928A (en) | 2017-10-23 | 2017-10-23 | A kind of twin cam shaft becomes Stroke Engine distribution switching mechanism |
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| CN108800736A (en) * | 2018-08-01 | 2018-11-13 | 惠而浦（中国）股份有限公司 | A kind of refrigerator assistance door opening device |
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| CN111237054A (en) * | 2018-11-29 | 2020-06-05 | 何迅 | Variable stroke internal combustion engine |
| CN113107636A (en) * | 2021-05-14 | 2021-07-13 | 北京理工大学 | Two-section type hydraulic tappet, two-section type variable valve lift mechanism and control method thereof |
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