CN108757083A - A kind of variable valve actuator for air of hydraulic-driven - Google Patents
A kind of variable valve actuator for air of hydraulic-driven Download PDFInfo
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- CN108757083A CN108757083A CN201810516385.5A CN201810516385A CN108757083A CN 108757083 A CN108757083 A CN 108757083A CN 201810516385 A CN201810516385 A CN 201810516385A CN 108757083 A CN108757083 A CN 108757083A
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- valve
- hydraulic cylinder
- reversal valve
- hydraulic
- rocking arm
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- 239000002828 fuel tank Substances 0.000 claims abstract description 16
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- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
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- 238000012545 processing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
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- 238000002485 combustion reaction Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 229920000742 Cotton Polymers 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
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- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 230000005226 mechanical processes and functions Effects 0.000 description 1
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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
- 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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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D2013/0296—Changing the valve lift only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- 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)
Abstract
The invention discloses a kind of variable valve actuator for air of hydraulic-driven, its technical solution be further include having control loop, control loop includes the hydraulic cylinder for pushing connecting rod, oscillating motor for rotation cam axis, oil pump, fuel tank, first reversal valve, second reversal valve, connecting tube and several oil pipes, connecting rod can opposing hydraulic cylinder end face sliding, hydraulic cylinder is separately connected the first reversal valve and the second reversal valve with oscillating motor by oil pipe, first reversal valve and the second reversal valve are connected to fuel tank and connecting tube by oil pipe, connecting tube is connected by the output end of oil pipe and oil pump, the input terminal of oil pump is connected with fuel tank, solve the problems, such as that the lower transmission efficiency of motor driving is not high and motor shaft can bring error because inertia cannot stop in time.
Description
Technical field
The present invention relates to a kind of engine art, more particularly to a kind of variable valve actuator for air of hydraulic-driven.
Background technology
Valve actuating mechanism is one of important component of internal combustion engine, is to realize engine breathing process, ensures internal combustion engine heat
The working cycles of work(conversion are able to the basis constantly to go in cycles.And existing all kinds of variable valve actuator for air, have one
Class is articulated in fixed link by master rocker and from rocking arm, is arranged general cam simultaneously on a camshaft and high angle is convex
Wheel, one end of master rocker and one end from rocking arm are inconsistent with general cam and high angle cam respectively, from the other end of rocking arm
It is connected with the air valve shaft for driving valve motion, whether is joined together to control by master rocker and from rocking arm by a connecting rod
Valve is the movement with master rocker and movement that is mobile or accompanying rocking arm occurs and moves, and valve movement model is realized with this
That encloses is variable, and in valve-closing, connecting rod can be such that primary rocker arm is moved together with from rocking arm across master rocker and from rocking arm,
Deficiency existing for this kind of variable valve actuator for air is a drive cam axle, and the axis of motor from turn to stop can exist it is used
Property, this can cause state when general cam and static high angle cam not in place, master rocker and the connection both from rocking arm
Hole misplaces and so that connecting rod can not be also cross the connecting hole of the two, and hydraulic-driven stops stopping, and avoids inertia belt
Influence；Another is then responsible for whether control connecting rod links together by master rocker and from rocking arm, and motor compares the biography of hydraulic pressure
It is low to pass efficiency, hydraulic-driven transmission efficiency is high, i.e. the power of motor pushing connecting rod does not have the power under hydraulic-driven big, now designs one
The variable valve actuator for air of kind hydraulic-driven.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of transmission efficiency height and avoid camshaft
The inertia belt of rotation carrys out the variable valve actuator for air of the hydraulic-driven of error.
To achieve the above object, the present invention provides following technical solutions：A kind of variable valve actuator for air of hydraulic-driven, packet
Valve assembly is included, the valve assembly includes a fixed link, a camshaft and a connecting rod, the fixed link quilt
Fixed, fixing sleeve is equipped with general cam and high angle cam on the camshaft, and the overall size of the high angle cam is more than
The overall size of general cam is hinged with master rocker in the fixed link and from rocking arm, the master rocker and one end from rocking arm
It is inconsistent with the side of high angle cam and general cam respectively and can opposite sliding, be connected on the other end from rocking arm
Air valve shaft, the air valve shaft are arranged on the air valve shaft for valve return far from valve is connected with from one end of rocking arm
Valve spring, the master rocker and be both provided with the connecting hole passed through for connecting rod from rocking arm, further include having control loop,
The control loop includes for pushing the hydraulic cylinder of connecting rod, for the oscillating motor, oil pump, oil of rotation cam axis
Case, the first reversal valve, the second reversal valve, connecting tube and several oil pipes, the connecting rod can opposing hydraulic cylinder end face sliding,
The hydraulic cylinder is separately connected the first reversal valve and the second reversal valve, first reversal valve with oscillating motor by oil pipe
Fuel tank and connecting tube are connected to by oil pipe with the second reversal valve, the connecting tube is connected by the output end of oil pipe and oil pump
It connects, the input terminal of oil pump is connected with fuel tank, and under original state, hydraulic cylinder is in breaking with oil pump, at oscillating motor and oil pump
In access, connecting rod is detached with connecting hole；When valve carry out small range movement when, by transfer the first reversal valve make oil pump with
Oscillating motor is connected to；When valve is moved on a large scale, camshaft reset is made into primary rocker arm and from the company of both rocking arms
It connects hole to be aligned, makes oil pump and oscillating motor open circuit by transferring the second reversal valve, made by transferring the first reversal valve
Oil pump is connected to hydraulic cylinder, and Hydraulic Cylinder connecting rod is interspersed in connecting hole, then is restored between oil pump and oscillating motor
Connection, the sliding of connecting rod opposing hydraulic cylinder.
As a further improvement on the present invention, the oscillating motor includes to push hydraulic cylinder and shell, the shell
Internal hollow out is provided with a drive shaft on shell, and one end that the drive shaft is pierced by shell is connected with camshaft, is located at shell
Interior one end is rotatably connected with shell, and gear is coaxially arranged in the drive shaft, and the gear is engaged with a rack, the tooth
Item is connect with shell slip, and one end of rack is pierced by shell and is connected with hydraulic cylinder is pushed, and second reversal valve is three
Position and four-way reversing valve, the promotion hydraulic cylinder are connect with the second reversal valve, push hydraulic cylinder to stretch to control by the second reversal valve
Long and shortening.
As a further improvement on the present invention, there are two travel switches for setting in the promotion hydraulic cylinder, when promotion hydraulic pressure
When cylinder pushes rack to be moved to maximum distance, the travel switch that hydraulic cylinder touches the maximum distance apart is pushed to make the second reversal valve
Commutation.
As a further improvement on the present invention, the length of the rack is in a circle with the range for capableing of the rotation of sliding tooth wheel
Above to two circles it is following between.
As a further improvement on the present invention, the control loop further includes having overflow valve, the connecting tube extend from
Nozzle, the overflow valve are connected to by oil pipe between nozzle and fuel tank.
As a further improvement on the present invention, the master rocker and from rocking arm respectively close to high angle cam and common convex
It is rotatable on one end of wheel to be provided with idler wheel, master rocker and from the respective idler wheel of rocking arm respectively with high angle cam and common convex
The edge of wheel is inconsistent.
As a further improvement on the present invention, the connecting rod is used to penetrate one end progress rounded corner of connecting hole or falls
Oblique angle, the idler wheel coaxial sleeve are set in a shaft and can be rotated relative to shaft, are located at from the shaft on rocking arm and consolidate with from rocking arm
It is fixed to connect, it is both provided with movable disk on the both ends of the shaft on master rocker, is provided on the master rocker and holds for movable disk
The loose slot received and the axis hole passed through for shaft, the axis hole and loose slot coaxial communication, and axis hole with respect to loose slot close to
Idler wheel, the overall size of the loose slot are more than the overall size of movable disk, and the aperture of the axis hole is more than the diameter of shaft, institute
It states and is provided with deformable soft layer between loose slot and the side of movable disk.
Beneficial effects of the present invention control the movement of both connecting rod and camshaft by designing hydraulic control circuit,
Hydraulic circuit not will produce a large amount of heat compared to circuit, and under motor and the same power of oil pump, the thrust of hydraulic-driven is big, pass
It passs efficient, connecting rod and camshaft can be driven to be moved rapidly；And oscillating motor drives cam axle compared to electricity
Machine drive cam shaft rotates, and when camshaft can be avoided to need to stop and because inertia continues to move, causes master rocker and from shaking
The case where connecting hole of arm between the two can not be aligned so that camshaft can stop stopping, and can smoothly be shaken master for connecting rod
Arm and linking together from rocking arm lays the foundation.
Description of the drawings
Fig. 1 is a kind of stereogram of embodiment of the present invention.
Fig. 2 is a kind of hydraulic circuit diagram of embodiment of the present invention.
Fig. 3 is the stereogram of another embodiment of the present invention.
Fig. 4 is the hydraulic circuit diagram of another embodiment of the present invention.
Fig. 5 is the broken away view of the idler wheel and master rocker of the present invention.
Specific implementation mode
The present invention is described in further detail below in conjunction with the embodiment given by attached drawing.
Shown in Fig. 5, a kind of variable valve actuator for air of hydraulic-driven of the present embodiment, includes valve assembly
1, valve assembly 1 can be put into a babinet in practice, and valve assembly 1 includes 11,12 and of camshaft of a fixed link
A piece connecting rod 17, fixing sleeve is equipped with general cam 13 and high angle cam 14 on camshaft 12, you can by camshaft 12
Side wall on keyway is set, and the opposite camshaft of general cam 13 and high angle cam 14 is made by the cooperation of key and keyway
12 is circumferentially fixed, then makes 13 He of general cam by being clamped baffle in the whole both sides of general cam 13 and high angle cam 14
14 opposing cam axis of high angle cam, 12 axial restraint；Also or directly by general cam 13 and high angle cam 14 and camshaft
12 are integrally formed；The overall size of high angle cam 14 is more than the overall size of general cam 13, the tip of high angle cam 14
Part is longer than the tip portion of general cam 13, so as to air valve shaft 18 under the drive of high angle cam 14 displacement distance bigger,
It is hinged with master rocker 15 in fixed link 11 and from rocking arm 16, fixed link 11 is fixed together with babinet, 15 He of master rocker
It is inconsistent with the side of high angle cam 14 and general cam 13 respectively from one end of rocking arm 16 and can opposite sliding, from rocking arm 16
The other end on be connected with air valve shaft 18, air valve shaft 18 from one end of rocking arm 16 far from being connected with valve 19, on air valve shaft 18
It is arranged with the valve spring 10 resetted for valve 19, convex disk, one end of valve spring 10 are set on the side wall of air valve shaft 18
It is fixedly connected with convex disk, the hole stretched out for air valve shaft 18 is provided on babinet, valve 19 is located at except babinet, i.e. valve spring
10 other end and cabinet wall are inconsistent, master rocker 15 and the connecting hole passed through for connecting rod 17 are both provided with from rocking arm 16
20, this is existing mechanical part, under original state, master rocker 15 and is in straight line from the connecting hole 20 of both rocking arms 16
Upper and alignment, connecting rod 17 are detached with connecting hole 20；In actual mechanical process, when engine is in low speed operation, connecting rod
17 is motionless, control motor rotation cam axis 12, from rocking arm 16 and master rocker 15 respectively with respect to general cam 13 and high angle cam
14 slidings, air valve shaft 18 accompany the movement locus of rocking arm 16 and move and valve 19 is driven to move up and down, the mobile model of valve 19
It encloses small；When engine is needed from low speed operation conversion to high-speed cruising, the motor control camshaft 12 of control camshaft 12 is multiple
Position, from rocking arm 16 and master rocker 15 respectively as general cam 13 and high angle cam 14 restore to original state, from rocking arm 16
It is aligned with the connecting hole 20 of master rocker 15 between the two, the motor pushing connecting rod 17 being connected with connecting rod 17 is interspersed in from rocking arm 16
To be connected as one from rocking arm 16 and master rocker 15 in the connecting hole 20 of both master rockers 15, the electricity being connected with connecting rod 17
Machine is connect with babinet slip, and the track of the motor slippage changes with the movement locus of master rocker 15, drives 12 turns of main axle
It is dynamic, slide and move with respect to high angle cam 14 with master rocker 15 from rocking arm 16, air valve shaft 18 with master rocker 15 movement locus
It influences so that the range that valve 19 moves up and down becomes larger；
Further include having control loop 2, control loop 2 is also disposed in babinet, control loop 2 includes for the company of promotion
The hydraulic cylinder 21 of extension bar 17, the oscillating motor 22 for rotation cam axis 12, oil pump 23, fuel tank 24, the first reversal valve 25,
Two reversal valves 26, connecting tube 27 and several oil pipes 28, the first reversal valve 25 and the second reversal valve 26 select solenoid valve, electromagnetism
Response valve is fast, and control accuracy is good, is convenient for 26 respective power and energy of the first reversal valve 25 and the second reversal valve, connecting rod 17 can
The end face of opposing hydraulic cylinder 21 slides, and T-shaped slide rail is arranged on the end face of hydraulic cylinder 21, the track of T-shaped slide rail is with connecting rod 17
The trail change integrally moved with master rocker 15 is provided with and T-shaped slide rail phase on one end that connecting rod 17 is connected with hydraulic cylinder 21
The sliding block of adaptation limits sliding block by T-shaped slide rail, and sliding block can be moved along T-shaped slide rail, and sliding block can be from the edge of hydraulic cylinder 21
It slides into T-shaped slide rail, connecting rod 17 is limited on hydraulic cylinder 21；Hydraulic cylinder 21 is divided by oil pipe 28 with oscillating motor 22
The first reversal valve 25 and the second reversal valve 26 are not connected, and the first reversal valve 25 and the second reversal valve 26 are connected to by oil pipe 28
Fuel tank 24, for connecting tube 27 there are three opening, the first reversal valve 25 and the second reversal valve 26 pass through 28 company of being respectively connected to of oil pipe
Two openings of take over 27,27 remaining openings of connecting tube are connect by oil pipe 28 with the output end of oil pump 23, oil pump
23 input terminal is connected with fuel tank 24, and the second reversal valve 26 selects two-position four way change valve, the first reversal valve 25 to select three four
Logical reversal valve, under original state, the first reversal valve 25 is in middle position, and the second reversal valve 26 is in left position, connecting rod 17 with connect
Hole 20 detaches, then hydraulic cylinder 21 is in open circuit with oil pump 23, and oscillating motor 22 is in access with oil pump 23；Oil pump 23 is opened,
Oil in fuel tank 24 is delivered in oil pipe 28 by oil pump 23, and because the first reversal valve 25 is in middle position, then oil can not be changed by first
Hydraulic cylinder 21 is reached to valve 25, connecting rod 17 remains stationary as；Oil is flowed in oscillating motor 22 simultaneously by the second reversal valve 25
Drive oscillating motor 22 that camshaft 12 is driven to rotate, the movement of valve 19 is by the shadow from rocking arm 16 and general cam 13 at this time
It rings, moving range is small, and engine is in low speed operation；When needing from low speed operation conversion to run engine to high speed,
First equal camshafts 12 turn to the position consistent with original state, adjust the second reversal valve 26 and are in right position, adjust the first commutation
Valve 25 is in left position, then oil pump 23 and oscillating motor 22 are in open circuit, and oil pump 23 and hydraulic cylinder 21 be in access, oily by the
One reversal valve 25 reaches in hydraulic cylinder 21, and hydraulic cylinder 21 pushes connecting rod 17 to pass through connecting hole 20, connecting rod 17 and connecting hole 20
After interting in place, the first reversal valve 25 restores to middle position, and being constantly in left position compared to the first reversal valve 25 can avoid oil pump 23 1
Directly exert a force to hydraulic cylinder 21 and so that the phenomenon that damaging or bond occurs in hydraulic cylinder 21, improve hydraulic cylinder 21 service life and
The safety of operation, this is also that the first reversal valve 25 does not select two-position four way change valve and the reason that selects three position four-way directional control valve
By；The second reversal valve 26 restores to left position simultaneously, and camshaft 12 rotates, and the movement of valve 19 is by master rocker 15 and high angle at this time
The influence of cam 14, moving range are big；When need by engine therefrom high-speed cruising switch to low speed operation when, wait camshafts 12
Initial position is turned to, the second reversal valve 26 is adjusted and is in right position, adjust right position at the first reversal valve 25, then oil pump 23 and swing
Hydraulic cylinder 22 is in open circuit, and oil pump 23 is in access with hydraulic cylinder 21, and oil is reached by the first reversal valve 25 in hydraulic cylinder 21, liquid
The oil inlet and outlet of cylinder pressure 21 exchanges connection oil inlet pipe and flowline, 21 reverse movement of hydraulic cylinder simultaneously drive connecting rod 17 to move back
Go out connecting hole 20, until after connecting rod 17 exits connecting hole 20, the first reversal valve 25 restores to middle position, and the second reversal valve 26 restores
To left position, camshaft 12 rotates, and the movement of valve 19 is influenced by from rocking arm 16 and general cam 13 again, the movement of valve 19
Range becomes smaller, and the recovery of camshafts 12 is waited to be rotated in camshaft 12 to initial position and by connecting rod 17 compared with connecting hole 20 detaches
While by connecting rod 17 detach connecting hole 20 can avoid connecting rod 17 detach master rocker 15 or from rocking arm 16 when, connecting rod 17 with
Master rocker 15 or from the side wall of rocking arm 16 there is a phenomenon where wearing, extend connecting rod 17, master rocker 15 and the use from rocking arm 16
Service life improves interstructural safety；So design realizes that the control to valve 19, hydraulic-driven are compared by hydraulic-driven
Electric drive is small, and hydraulic-driven is with electric drive under the same power, and the thrust ratio electric drive that hydraulic-driven generates is big, hydraulic pressure
The response of cylinder 21 and oscillating motor 22 is fast, so that connecting rod 17 responds soon with camshaft 12；Pass through oscillating motor 22
Camshaft 12 is made to stop avoidable camshaft 12 because inertia also will continue to rotate by motor so that camshaft 12 stops to compare
The case where certain angle, realizes camshaft 12 and stops to stop so that master rocker 15 and the connecting hole from rocking arm 16 between the two
20 can be mutually aligned so as to the connection of connecting rod 17, and hydraulic-driven drives heat-resist, the easy fever of motor compared to motor
Hot and electric wire can be easy to burn out electric wire because of the big generation heat of electric current, and hydraulic circuit will not generate heat hot, and oil movement is steady
It is fixed.
As a kind of improved specific implementation mode, shown in Fig. 2, oscillating motor 22 includes promotion liquid
Cylinder pressure 221 and shell 222,222 inside hollow out of shell are provided with a drive shaft 223 on shell 222, and drive shaft 223 is pierced by shell
One end of body 222 is connected with camshaft 12, and one end in shell 222 is rotatably connected with shell 222, in drive shaft 223
It is coaxially arranged with gear 224, gear 224 is engaged with a rack 225, which connect with 222 slip of shell, and rack
225 one end is pierced by shell 222 and is connected with hydraulic cylinder 221 is pushed, and the second reversal valve 26 is three position four-way directional control valve, is being installed
In the process, shell 222 is cut in half, gear 224 is arranged in drive shaft 223, is passed through between gear 224 and drive shaft 223
Key connection, is fixedly connected with turntable on one end of drive shaft 223, half dish groove is provided on two parts of shell 222, in shell
The mutual split of two parts of body 222 and when be fixed together, two and half dish groove split splits and to rotary disk limitation, turntable can
It rotates in half dish groove, then the trepanning on a shell, rack 225 is stretched into hole and is engaged with gear 224, rack 225 reveals
It is connect in one end outside shell 222 with the output end of hydraulic cylinder 221 is pushed, drive shaft 223 is connected by shaft coupling and camshaft 12
It connects, because of 225 limited length of rack, so after rack 225 pushes gear 224 to rotate forward, needs reversely to move rack 225
Dynamic, so that gear 224 rotates backward, i.e., it is three position four-way directional control valve, second reversal valve to select the second reversal valve 26
26 two side positions control pushes hydraulic cylinder 221 to be moved forward and backward with carry-over bar 225, and centre position is running to work as hydraulic cylinder 21
When keep camshaft 12 to remain static, push the design of hydraulic cylinder 221 so that the thrust that is subject to of rack 225 is big, improve
The response speed that rack 225 is rotated with moving gear 224, and the transmission efficiency between rack 225 and gear 224, drive shaft 223
Rotation is rapid.
As a kind of improved specific implementation mode, with reference to shown in Fig. 4, stroke there are two being arranged in hydraulic cylinder 221 is pushed
Switch 226, the second reversal valve 26 are solenoid valve, and two travel switches 226, which are electrically connected to control the second reversal valve 26 shifting, to be changed
To two electromagnet, when push hydraulic cylinder 221 output end band carry-over bar 225 be moved to maximum distance when, push hydraulic cylinder
221 output end and one of travel switch 226 are inconsistent, the trip switch 226 control two electromagnet be separately energized with
Power-off so that the second reversal valve 26 commutates, and hydraulic cylinder 221 is pushed to be moved backward with carry-over bar 225, until pushing hydraulic cylinder 221
Output end fall back at another travel switch 226 and touch the trip switch 226, the electromagnet point of 26 both sides of the second reversal valve
Not from be energized to power-off and down to energization so that push hydraulic cylinder 221 output end band carry-over bar 225 again toward shell
It moves in 222, recycles always, the design of travel switch 226 makes 26 automatic reverse of the second reversal valve, and camshaft 12 is had
The work of rule, which is gone down, to be stopped, and control accuracy is high, and the movement sustainability of camshaft 12 is good.
As a kind of improved specific implementation mode, referring to Figure 1 and Figure 3 shown in, the length of rack 225 is with being capable of sliding tooth
The range of 224 rotation of wheel be in a circle it is above to two circles it is following between, if more precisely, with master rocker 15 and from 16 liang of rocking arm
When connecting hole 20 is aligned between person, the position of camshaft 12 is set to base position, and the rotational angle of camshaft 12 is zero degree at this time, is taken
One value X's, X is ranging from more than 0, is less than 180, then the slewing area of camshaft 12 can be set to-X degree to 360+X degree, X values
Design is when rack 225 is moved to extreme position, and the state position comparative basis position of camshaft 12 is deviated, and is so set
It is calculated as avoiding connecting rod 17 with 20 grafting of connecting hole or when detaching, the travel switch 226 in hydraulic cylinder 221 is pushed to be touched
Hair so that the second reversal valve 26 receives simultaneously in middle position and instruction entanglement occurs in right position or the instruction of left position this two
The problem of, i.e., when connecting rod 17 is detached with connecting hole 20 or grafting, camshaft 12 is in base position, the second commutation
Valve 26 is in middle position；When pushing hydraulic cylinder 221 to need commutation operation, rack 225 reaches the limit of position, and camshaft 12 turns to
Extreme position, the second reversal valve 26 switch in left position and right position, are designed so that interstructural relationship is rationalized；It is excellent
Change ground, the numerical value of X should take toward small numerical value, and the angle that camshaft 12 can rotate levels off to 360 degree, i.e. 12 turns of camshaft
A dynamic circle is more, this is to save production cost, while decreasing installation space, but X to shorten the length of rack 225
Value cannot be too small, rationalization should be obtained, depending on actual demand and the size of high angle cam 14 and general cam 13.
As a kind of improved specific implementation mode, with reference to shown in Fig. 3 to Fig. 4, although when control loop 1 works
It waits, it must there are one be in open-circuit condition in 26 the two of the first reversal valve 25 and the second reversal valve so that the oil in oil pipe 28 has ground
Side can flow, but in the first reversal valve 25 and the second reversal valve 26 in switching state, occur being in middle position while meeting is of short duration
The case where, the oil pressure in oil pipe 28 can rise, and cause to squeeze to oil pipe 28, and the date is long, can influence the service life of oil pipe 28,
Result even in the explosion of oil pipe 28；It is broken down there is also the first reversal valve 25 and the second reversal valve 26 so that control loop 2 goes out
The phenomenon of existing open circuit, causes the oil pressure in oil pipe 28 to steeply rise, and oil pipe 28 is bursting at the collision, in order to solve this problem, control loop 2
Further include having overflow valve 29, connecting tube 27 is extended from nozzle 6, i.e., there are four openings, overflow valve 29 to pass through oil pipe for connecting tube 27
28 are connected between nozzle 6 and fuel tank 24, and the design of overflow valve 29 is so that the oil pressure in oil pipe 28 will more than certain numerical value
It touches overflow valve 29 to open, the oil stream in oil pipe 28 enters in fuel tank 24 so that the range in safety of the oil pressure in oil pipe 28
It is interior, to protect oil pipe 28, improve the safety of control loop 2.
As a kind of improved specific implementation mode, referring to Figure 1 and Figure 3 shown in, master rocker 15 and leaned on respectively from rocking arm 16
Be bordering on one end of high angle cam 14 and general cam 13 it is rotatable be provided with idler wheel 3, master rocker 15 and each from rocking arm 16
From idler wheel 3 it is inconsistent with the edge of high angle cam 14 and general cam 13 respectively, 15 He of master rocker is compared in the design of idler wheel 3
From rocking arm 16, directly opposite high angle cam 14 and general cam 13 slide respectively, sliding friction are converted to rolling friction, greatly
It is big to reduce master rocker 15 and from the frictional force between high angle cam 14 and general cam 13 respectively of rocking arm 16, while also keeping away
Exempt from the abrasion between master rocker 15 and high angle cam 14 and between rocking arm 16 and general cam 13, improves each zero
The service life of part.
As a kind of improved specific implementation mode, referring to Figure 5, master rocker 15 and material from rocking arm 16 generally by
Metal is made, then master rocker 15 and from rocking arm 16 can not deformation, this can make in actual processing and installation process, for protect
Card connecting rod 17 can be interspersed in master rocker 15 and simultaneously from the connecting hole 20 of both rocking arms 16, to master rocker 15 and from rocking arm 16
Etc. related components dimension precision requirement it is high, processing cost rises, and to reduce processing cost and improving yield rate, is designing
Aspect, one end that connecting rod 17 is used to penetrate connecting hole 20 carry out rounded corner or bevelling, and 3 coaxial sleeve of idler wheel is set to one turn
It can rotate on axis 4 and relative to shaft 4, be fixedly connected with from rocking arm 16 positioned at from the shaft 4 on rocking arm 16, is located on master rocker 15
Shaft 4 both ends on be both provided with movable disk 5, the loose slot 51 accommodated for movable disk 5 is provided on master rocker 15 and for turning
The axis hole 52 that axis 4 passes through, axis hole 52 and 51 coaxial communication of loose slot, and the opposite loose slot 51 of axis hole 52 is close to idler wheel 3, it is movable
The overall size of slot 51 is more than the overall size of movable disk 16, and the aperture of axis hole 52 is more than the diameter of shaft 4,17 chamfering of connecting rod
Design compared to showing the aperture of the head end of connecting rod 17 not brought 17 head end of connecting rod of chamfering and connecting hole 20 is inconsistent
As that can be calibrated by chamfering while passing through connecting hole 20 convenient for connecting rod 17, movable disk 5 occurs in loose slot 51
Corresponding movement and shaft 4 accordingly move in axis hole 52, during connecting rod 17 is inserted into connecting hole 20, on master rocker 15
Idler wheel 3 it is inconsistent with high angle cam 14 always, shaft 4 with respect to master rocker 15 it is mobilizable design make primary rocker arm 15 plus
Work required precision reduces, and saves production and processing cost and difficulty, improves yield rate；In the side of loose slot 51 and movable disk 16
Be provided with deformable soft layer 53 between side, soft layer 53 can be flexible rubber, cotton also or spring, it is soft
The design of layer 53 is to carry out elastic spacing to movable disk 5 so that movable disk 5 will not be arbitrarily mobile relative to loose slot 51, but only
Can be when connecting rod 17 be inserted into the connecting hole 20 of master rocker 15 and master rocker 15 occurs mobile relative to connecting rod 17,53 meeting of soft layer
Corresponding variation occurs so that idler wheel 3 keeps inconsistent after the movement of master rocker 15 with high angle cam 14, is master rocker 15
Opposite 14 sliding of high angle cam is ready, and the connective stability between idler wheel 3 and master rocker 15 is improved.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of variable valve actuator for air of hydraulic-driven includes valve assembly (1), the valve assembly (1) includes one
Fixed link (11), a camshaft (12) and a connecting rod (17), the fixed link (11) are fixed, the camshaft (12)
Upper fixing sleeve is equipped with general cam (13) and high angle cam (14), and the overall size of the high angle cam (14) is more than commonly
The overall size of cam (13) is hinged with master rocker (15) on the fixed link (11) and from rocking arm (16), the master rocker
(15) and and energy inconsistent with the side of high angle cam (14) and general cam (13) respectively from one end of rocking arm (16) is opposite
Sliding, described that air valve shaft (18) is connected with from the other end of rocking arm (16), the air valve shaft (18) is separate from rocking arm (16)
It is connected with valve (19) on one end, the valve spring (10) resetted for valve (19), institute are arranged on the air valve shaft (18)
It states master rocker (15) and is both provided with the connecting hole (20) passed through for connecting rod (17) from rocking arm (16), it is characterised in that：Also
Include control loop (2), the control loop (2) includes for pushing the hydraulic cylinder of connecting rod (17) (21), for turning
The oscillating motor (22) of moving cam axis (12), oil pump (23), fuel tank (24), the first reversal valve (25), the second reversal valve (26),
Connecting tube (27) and several oil pipes (28), the connecting rod (17) can opposing hydraulic cylinder (21) end face sliding, the hydraulic pressure
Cylinder (21) is separately connected the first reversal valve (25) and the second reversal valve (26), institute with oscillating motor (22) by oil pipe (28)
It states the first reversal valve (25) and the second reversal valve (26) and fuel tank (24) and connecting tube (27) is connected to by oil pipe (28), it is described
Connecting tube (27) is connect by oil pipe (28) with the output end of oil pump (23), and the input terminal of oil pump (23) is connected with fuel tank (24),
Under original state, hydraulic cylinder (21) is in open circuit with oil pump (23), and oscillating motor (22) is in access with oil pump (23), connects
Bar (17) is detached with connecting hole (20)；When valve (19) carries out small range movement, made by transferring the first reversal valve (25)
Oil pump (23) is connected to oscillating motor (22)；When valve (19) is moved on a large scale, camshaft (12) is resetted and is made
Master rocker (15) and connecting hole (20) from both rocking arms (16) are aligned, by transferring the second reversal valve (26) so that oil pump
(23) with oscillating motor (22) open circuit, by transferring the first reversal valve (25) oil pump (23) is connected to hydraulic cylinder (21),
Hydraulic cylinder (21) pushes connecting rod (17) to be interspersed in connecting hole (20), then restores between oil pump (23) and oscillating motor (22)
Connection, connecting rod (17) opposing hydraulic cylinder (21) sliding.
2. a kind of variable valve actuator for air of hydraulic-driven according to claim 1, it is characterised in that：The oscillating motor
(22) include to push hydraulic cylinder (221) and shell (222), the internal hollow out of the shell (222), shell is provided on (222)
A piece drive shaft (223), one end that the drive shaft (223) is pierced by shell (222) are connected with camshaft (12), are located at shell
(222) one end in is rotatably connected with shell (222), and gear (224) is coaxially arranged on the drive shaft (223), described
Gear (224) is engaged with a rack (225), which connect with shell (222) slip, and one end of rack (225)
It is pierced by shell (222) and is connected with hydraulic cylinder (221) is pushed, second reversal valve (26) is three position four-way directional control valve, described
It pushes hydraulic cylinder (221) to be connect with the second reversal valve (26), pushes hydraulic cylinder (221) to stretch to control by the second reversal valve (26)
Long and shortening.
3. a kind of variable valve actuator for air of hydraulic-driven according to claim 2, it is characterised in that：The promotion hydraulic cylinder
(221) there are two travel switches (226) for setting in, push rack (225) to be moved to maximum distance when pushing hydraulic cylinder (221)
When, push hydraulic cylinder (221) to touch the travel switch (226) of the maximum distance apart so that the second reversal valve (26) commutation.
4. a kind of variable valve actuator for air of hydraulic-driven according to claim 3, it is characterised in that：The rack (225)
Length with can drive the range that gear (224) rotates be in a circle it is above to two circles it is following between.
5. a kind of variable valve actuator for air of hydraulic-driven according to claim 1 or 2 or 3 or 4, it is characterised in that：It is described
Control loop (2) further includes having overflow valve (29), and the connecting tube (27) is extended from nozzle (6), and the overflow valve (29) is logical
Oil pipe (28) is crossed to be connected between nozzle (6) and fuel tank (24).
6. a kind of variable valve actuator for air of hydraulic-driven according to claim 1 or 2 or 3 or 4, it is characterised in that：It is described
Master rocker (15) and from rocking arm (16) respectively close in rotatable on one end of high angle cam (14) and general cam (13)
Be provided with idler wheel (3), master rocker (15) and from rocking arm (16) respective idler wheel (3) respectively with high angle cam (14) and common convex
The edge for taking turns (13) is inconsistent.
7. a kind of variable valve actuator for air of hydraulic-driven according to claim 6, it is characterised in that：The connecting rod (17)
One end for penetrating connecting hole (20) carries out rounded corner or bevelling, and idler wheel (3) coaxial sleeve is set in a shaft (4)
And can be rotated relative to shaft (4), it is located at and is fixedly connected from the shaft (4) on rocking arm (16) with from rocking arm (16), is located at master rocker
(15) it is both provided with movable disk (5) on the both ends of the shaft (4) on, is provided on the master rocker (15) and holds for movable disk (5)
The loose slot (51) received and the axis hole (52) passed through for shaft (4), the axis hole (52) and loose slot (51) coaxial communication, and axis
With respect to loose slot (51) close to idler wheel (3), the overall size of the loose slot (51) is more than the profile of movable disk (5) in hole (52)
Size, the aperture of the axis hole (52) is more than the diameter of shaft (4), between the loose slot (51) and the side of movable disk (5)
It is provided with deformable soft layer (53).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810516385.5A CN108757083B (en) | 2018-05-25 | 2018-05-25 | Hydraulically-driven variable valve mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810516385.5A CN108757083B (en) | 2018-05-25 | 2018-05-25 | Hydraulically-driven variable valve mechanism |
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| CN108757083B CN108757083B (en) | 2020-01-10 |
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| CN201810516385.5A Active CN108757083B (en) | 2018-05-25 | 2018-05-25 | Hydraulically-driven variable valve mechanism |
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| US4794892A (en) * | 1986-11-12 | 1989-01-03 | Honda Giken Kogyo Kabushiki Kaisha | Hydraulic circuit for valve operation timing changing device for internal combustion engine |
| DE4213855A1 (en) * | 1992-04-27 | 1993-10-28 | Iav Motor Gmbh Ingenieurgesell | Valve drive for intake valves of IC engine - has hydraulic tolerance compensation device between stroke transmission element and valve |
| GB2373824A (en) * | 2001-01-10 | 2002-10-02 | Lotus Car | Hydraulic actuating system for i.c. engine valves |
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|---|---|
| CN108757083B (en) | 2020-01-10 |
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Effective date of registration: 20221014 Address after: 710000 Floor 7, Building 1, No. 23, Middle Section of Daqing Road, Lianhu District, Xi'an, Shaanxi Patentee after: XI'AN RIXIN PRECISION MACHINERY Co.,Ltd. Address before: Room 2202, 22 / F, Wantong building, No. 3002, Sungang East Road, Sungang street, Luohu District, Shenzhen City, Guangdong Province Patentee before: Shenzhen dragon totem technology achievement transformation Co.,Ltd. |