CN109204787A - Vehicle frame folding and unfolding buffer unit and undercarriage - Google Patents
Vehicle frame folding and unfolding buffer unit and undercarriage Download PDFInfo
- Publication number
- CN109204787A CN109204787A CN201811248996.2A CN201811248996A CN109204787A CN 109204787 A CN109204787 A CN 109204787A CN 201811248996 A CN201811248996 A CN 201811248996A CN 109204787 A CN109204787 A CN 109204787A
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- CN
- China
- Prior art keywords
- vehicle frame
- oil
- oil circuit
- valve
- seal chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/02—Undercarriages
- B64C25/08—Undercarriages non-fixed, e.g. jettisonable
- B64C25/10—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like
- B64C25/18—Operating mechanisms
- B64C25/22—Operating mechanisms fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/066—Units characterised by the partition, baffle or like element
- F16F9/067—Partitions of the piston type, e.g. sliding pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3221—Constructional features of piston rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/362—Combination of sealing and guide arrangements for piston rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/368—Sealings in pistons
Abstract
The invention discloses a kind of vehicle frame folding and unfolding buffer units, including buffering actuator and Hydraulic Conirol Unit；Buffering actuator includes outer cylinder and piston rod, one end that piston rod is equipped with piston is slidedly arranged in the inner cavity of outer cylinder and connect with the bore seal of outer cylinder, the inner cavity of outer cylinder is divided into first annular seal space and the second seal chamber by piston, and the sectional area of first annular seal space is greater than the sectional area of the second seal chamber；Hydraulic Conirol Unit includes three-position four-way valve and shuttle valve；Three-position four-way valve is connected with the system hydraulic circuit of aircraft；Three-position four-way valve is communicated with the first oil circuit and the second oil circuit, and the first oil circuit is connected to the first oil inlet of first annular seal space and shuttle valve respectively；Second oil circuit is connected to the second oil inlet of shuttle valve；The oil outlet of shuttle valve is connected to the second seal chamber.Above-mentioned vehicle frame folding and unfolding buffer unit gathers multi -function in integral whole, and can realize in the receipts of vehicle frame, put down, the switching of aircraft landing and the servo-actuated buffer damping function of sliding race by the switching to 3-position 4-way valve position.
Description
Technical field
The invention belongs to undercarriage technical fields, more particularly to one kind is for realizing folding and unfolding to undercarriage vehicle frame
With the vehicle frame folding and unfolding buffer unit to frame ground pitch vibration progress buffer damping and with the vehicle frame folding and unfolding buffer unit
Undercarriage.
Background technique
Currently, the undercarriage of advanced large aircraft, which mostly uses, has longitudinally arranged more train vehicle frames on one-mast support
Configuration, in order to reduce flight resistance, undercarriage be usually designed to can folding and unfolding form, to keep collection space optimal, generally by vehicle frame
Receive to damper leg at proper angle after, pack up undercarriage；After landing drop, then vehicle frame is placed in scheduled appearance
State.Land and it is sliding run during, vehicle frame goes forward some wheel group in rear wheels by vertical very big impact or disturbance, and vehicle frame will
Make pitch vibration relative to suspended axle, when pitch vibration is quite big, the load acted on thereon may be beyond permissible value, and causes
The destruction of the landing gear structures such as vehicle frame, wheel；In addition, when vehicle frame pitch vibration is not evoked with the intrinsic frequency of vehicle frame in level line face,
The swing of vehicle frame high frequency will cause at vehicle frame suspended axle structure prematurely fatigue damage.
Currently, the frame cushion of domestic achievable above functions is more rare, and there are the sides such as reliability and safety
The deficiency in face.And the home-built aircraft of bogie landing gear is equipped, used vehicle frame stabilizing bumper is all and aircraft liquid substantially
The unconnected passive type buffer of pressure system, although the frame cushion structure type of this type is simple, functionally only
The dynamic buffering damping function in the sliding race of aircraft floor to vehicle frame is realized, cannot achieve the active accommodation of vehicle frame position.
Also, space is smaller between vehicle frame and damper leg, it is difficult to while draw off gear and buffer unit are accommodated, therefore,
Suitable vehicle frame folding and unfolding need to be designed and be buffered in integrated device: realizing the function of the folding and unfolding of vehicle frame；And to vehicle frame in aircraft landing
Pitch vibration when with by not level line face carries out buffer damping, effectively dissipation vibrational energy.
Patent application CN 201710806239.1 discloses a kind of bogie landing gear stabilizing bumper, but due to vehicle frame
Oil return when putting down in pressurized strut needs back hydraulic system, cannot differential work quick set-down vehicle frame, and hydraulic circuit accident
When there is failsafe valve or blocking, there are the risks that vehicle frame cannot be put down, and can vehicle frame reliably put down and directly influence aircraft
Safety, thus the safety of structure is relatively low.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, providing a kind of can be realized simultaneously to vehicle frame
Folding and unfolding and the adjusting of predetermined vehicle frame posture and aircraft landing and the sliding vehicle frame folding and unfolding for running servo-actuated buffer damping function buffer dress
It sets, correspondingly provides the undercarriage with the vehicle frame folding and unfolding buffer unit.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of vehicle frame folding and unfolding buffer unit, including buffering actuator and Hydraulic Conirol Unit；
The buffering actuator includes outer cylinder and piston rod, and one end of the piston rod is equipped with piston, and the piston rod, which is equipped with, lives
One end of plug is slidedly arranged in the inner cavity of the outer cylinder and connect with the bore seal of outer cylinder, and the piston is by the inner cavity of the outer cylinder
It is divided into first annular seal space and the second seal chamber, the sectional area of the first annular seal space is greater than the sectional area of the second seal chamber；
The Hydraulic Conirol Unit includes three-position four-way valve and shuttle valve；The system hydraulic circuit phase of the three-position four-way valve and aircraft
Even；
The three-position four-way valve is communicated with the first oil circuit and the second oil circuit, first oil circuit respectively with first annular seal space and shuttle valve
The first oil inlet connection；Second oil circuit is connected to the second oil inlet of the shuttle valve；The oil outlet of the shuttle valve and
The connection of two seal chambers.
By above structure, vehicle frame folding and unfolding buffer unit of the invention gathers multi -function in integral whole, and can pass through system electromagnetism
Mode the position of three-position four-way valve is controlled, piston rod can be controlled respectively to sap cavity input hydraulic pressure in different ways
Stretching and suppressed range then control the amplitude that the flexible driving vehicle frame of piston rod is rotated around hinge, to realize vehicle frame respectively
Receipts on, put down, aircraft landing and the sliding switching for running servo-actuated buffer damping function.
As a further improvement of the above technical scheme:
When the three-position four-way valve is located at left position, second oil circuit is connected to the oil return opening of system hydraulic circuit.Described
One oil circuit is connected to the oil inlet of system hydraulic circuit, and oil liquid enters in first annular seal space all the way, and another way enters after shuttle valve
In second seal chamber；The difference in areas of first annular seal space and the second seal chamber hydraulic action on the piston rod, so that piston rod stretches out,
And the hydraulic load for stretching out direction is exported, the hydraulic load of output acts on the vehicle frame hinged with piston rod and realizes that it puts down
Function.And piston rod stretches out so that the hydraulic oil in the second seal chamber returns in first annular seal space via shuttle valve, is not required to back hydraulic
System, therefore can realize the quick stretching of piston rod.
When the three-position four-way valve is located at right position, first oil circuit is connected to the oil return opening of system hydraulic circuit, institute
The second oil circuit is stated to be connected to the oil inlet of system hydraulic circuit.System oil-way flows into the second seal chamber after opening shuttle valve, in liquid
Under pressure effect, piston rod is to contract and exports drawing load, and at the same time, oil liquid flows into system oil return road T in first annular seal space.
The drawing load effect of buffering actuator output, which drives, receives upper function with its wide-angle is realized on the hinged vehicle frame of piston rod.
When the three-position four-way valve is located at middle position, first oil circuit and second oil circuit with system hydraulic circuit
Oil return opening connection；The vehicle frame folding and unfolding buffer unit and system hydraulic circuit disconnect.When the ballast that piston rod is transmitted by vehicle frame
Lotus (generates) during aircraft landing or sliding race, and liquid compression is squeezed into the oil circuit of Hydraulic Conirol Unit in first annular seal space, shape
At hydraulic damping and the impact energy that dissipates, oil liquid a part flows through shuttle valve and enters in the second seal chamber, and another part flows into system
Oil return line T, so that piston rod is shunk.As a result, during aircraft landing and sliding race, realize by the above process to vehicle frame
Vibration caused by the excitation of face load carries out buffer damping function.
The bottom of the outer tube inner chamber has the plunger in axial direction extended, and the piston rod protrudes into the outer tube inner chamber
One end offer the first hole, the plunger is slidedly arranged in first hole and is tightly connected with the first hole, first hole
Third seal chamber is formed between hole wall and the end face of the plunger, filled with gas in the third seal chamber.
Filled with the gas of predetermined pressure in third seal chamber, the gas of one side third seal chamber can assist the vehicle frame folding and unfolding
Buffer unit realizes that vehicle frame folding and unfolding and buffer damping function, the gas spring load exported on the piston rod such as gas pressure act on
It can assist realizing that vehicle frame puts down function on vehicle frame；In piston rod contraction process, the compression of third seal chamber inner body can absorb part
Impact energy is to assist realizing buffer damping function.Therefore, the output of system pressure can be reduced, save system hydraulic energy source.
On the other hand, when hydraulic system fault, piston rod stretches out under the effect of third seal chamber gas pressure, and second is close
It seals intracavitary oil liquid compression stream shuttle valve to enter in first annular seal space, to further piston rod be pushed to stretch out.Vehicle frame folding and unfolding buffering
Device output load push vehicle frame, by vehicle frame be lowered into can landing attitude, realize the emergency extension of vehicle frame, improve aircraft rise
Fall the reliability of frame system.
One end that the plunger protrudes into first hole offers the second hole being connected to third seal chamber, to increase third
The volume of seal chamber.
The end that the plunger protrudes into first hole is equipped with the sealing element for sealing the third seal chamber, first hole
Hole wall be equipped with the stopping step for preventing plunger from deviating from, the sealing element and the stopping step cooperate, and further ensure that the
The sealing of three seal chambers.
Also be serially connected with the first one-way throttle valve on first oil circuit, the oil inlet of first one-way throttle valve with it is described
Three-position four-way valve is connected, and the oil outlet of first one-way throttle valve is connected to the first annular seal space.
The second one-way throttle valve is also serially connected on oil circuit between the shuttle valve and second seal chamber, described second is single
It is connected to the oil inlet of throttle valve with the oil outlet of the shuttle valve, the oil outlet of second one-way throttle valve and described second close
Seal chamber connection.
By the setting of the first and second one-way throttle valves, can more accurately control in first annular seal space and the second seal chamber
The control that oil liquid is output and input.
First oil circuit is also connected to the second seal chamber, is serially connected on the oil circuit that first oil circuit is connected to the second seal chamber
First safety valve.
Second oil circuit is also connected to first annular seal space, is gone here and there on the oil circuit that second oil circuit is connected to first annular seal space
It is connected to the second safety valve.
When piston rod is acted on by great impact load, so that first annular seal space or the second seal chamber inner fluid are more than predetermined
Pressure, the first safety valve or the second safety valve open pressure release, and the vehicle frame folding and unfolding buffer unit structure is protected not to be damaged.
The inventive concept total as one, the present invention also provides a kind of undercarriage, including damper leg, vehicle frame and on
The vehicle frame folding and unfolding buffer unit stated, the one end of the piston rod far from the outer cylinder and the vehicle frame are hinged；The outer cylinder is separate
The end of the piston rod and the damper leg are hinged.
Compared with the prior art, the advantages of the present invention are as follows:
1, vehicle frame folding and unfolding buffer unit of the invention gathers multi -function in integral whole, and can not only realize the folding and unfolding of main landing gear vehicle frame,
It can also be achieved the adjusting of predetermined vehicle frame posture, and can and pitch vibration of vehicle frame during aircraft landing and sliding race be delayed
Punching damping, effectively dissipation vibrational energy；Finally, having the function of vehicle frame emergency extension, also to improve the reliability that vehicle frame uses.
2, vehicle frame folding and unfolding buffer unit of the invention can satisfy the requirements such as easy to maintain, high efficiency, high reliability.It can
Applied to the bogie landing gear system of large aircraft, there is apparent economic benefit.
Compared with patent application CN 201710806239.1, there are following technical advantages by the present invention: undercarriage can be improved
Safety, and improve vehicle frame and put down efficiency, shorten vehicle frame lowering time.Its principle are as follows: put down (piston rod stretching) in vehicle frame
When, pressurized strut realizes differential work by shuttle valve, and the oil return of pressurized strut rod chamber enters rodless cavity at this time, is not required to back hydraulic pressure system
System, therefore can realize the quick stretching of piston rod, and when the seal wear failure between two hydraulic cavities of pressurized strut, or work as and be
When system oil return line blocks, since the oil return of rod chamber is not necessarily to back hydraulic system, thus vehicle frame still can be normally put down, thus had
There is very high safety.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the undercarriage of the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of the vehicle frame folding and unfolding buffer unit of the embodiment of the present invention.
Fig. 3 is that the working principle diagram of vehicle frame function is put down in the realization of the vehicle frame folding and unfolding buffer unit of the embodiment of the present invention.
Fig. 4 is that the working principle diagram for holder function of getting on the bus is received in the realization of the vehicle frame folding and unfolding buffer unit of the embodiment of the present invention.
Fig. 5 is that the realization of the vehicle frame folding and unfolding buffer unit of the embodiment of the present invention carries out ground buffer damping function to vehicle frame
Working principle diagram.
Fig. 6 is the working principle of the realization emergency extension vehicle frame function of the vehicle frame folding and unfolding buffer unit of the embodiment of the present invention
Figure.
Fig. 7 is the structural schematic diagram of the shuttle valve in the embodiment of the present invention.
Marginal data: 1, actuator is buffered；11, outer cylinder；111, first annular seal space；112, the second seal chamber；113, plunger；
1131, the second hole；1132, sealing element；12, piston rod；121, piston；122, the first hole；1221, third seal chamber；1222, only
Dynamic step；13, cover；2, Hydraulic Conirol Unit；21, three-position four-way valve；22, shuttle valve；23, the first oil circuit；24, the second oil circuit；
25, the first one-way throttle valve；26, the second one-way throttle valve；27, the first safety valve；28, the second safety valve；3, damper leg；4,
Vehicle frame.
Specific embodiment
Below in conjunction with specific preferred embodiment, the invention will be further described, but not thereby limiting the invention
Protection scope.
Embodiment:
As shown in Figure 1, the undercarriage of the present embodiment, including damper leg 200, vehicle frame 300 and it is connected to therebetween
Vehicle frame folding and unfolding buffer unit.
As shown in Fig. 2, vehicle frame folding and unfolding buffer unit includes buffering actuator 1 and Hydraulic Conirol Unit 2 in the present embodiment.
Buffering actuator 1 is the execution unit of the vehicle frame folding and unfolding buffer unit, and buffering actuator 1 includes outer cylinder 11 and piston
Bar 12, one end of piston rod 12 are equipped with piston 121, and one end that piston rod 12 is equipped with piston 121 is slidedly arranged in the inner cavity of outer cylinder 11,
The open end setting cover 13 of outer cylinder 11 is sealed.The inner cavity of outer cylinder 11 is divided into first annular seal space 111 and second by piston 121
Seal chamber 112, wherein the sectional area of first annular seal space 111 is greater than the sectional area of the second seal chamber 112.
As shown in Figure 1, the one end of piston rod 12 far from outer cylinder 11 is hinged by oscillating bearing with vehicle frame 300；Outer cylinder 11 is remote
End and damper leg 200 from piston rod 12 is hinged by oscillating bearing.Piston rod 12 can make stretching motion along axis, with defeated
Corresponding folding and unfolding load or transmitting external applied load out.
With continued reference to Fig. 2, the bottom of 11 inner cavity of outer cylinder has the plunger 113 in axial direction extended, and piston rod 12 protrudes into
One end of 11 inner cavity of outer cylinder offers the first hole 122, and plunger 113 is slidedly arranged in the first hole 122, and plunger 113 protrudes into the first hole 122
End be equipped with sealing element 1132 for being tightly connected with the first hole 122, one end that plunger 113 protrudes into the first hole 122 opens up
There is the second hole 1131 being connected to the first hole 122, the second hole 1131 and 122 part of the first hole being connected to the second hole 1131 are formed
Third seal chamber 1221.
Wherein, first annular seal space 111 and the second seal chamber 112 are hydraulic by Hydraulic Conirol Unit 2 and the system of aircraft
Oil circuit is connected, and first annular seal space 111 and the second seal chamber 112 constitute sap cavity to provide hydraulic load.Third seal chamber 1221 is logical
Gas overcharging valve 1132 is filled with the gas of predetermined pressure, and third seal chamber 1221 forms the exportable gas spring of air cavity and carries after inflating
Lotus.
Wherein, the hole wall in the first hole 122 be equipped with prevent plunger 113 deviate from stopping step 1222, sealing element 1132 with
Stopping step 1222 cooperates, and is further sealed to third seal chamber 1221.
With continued reference to Fig. 2, in the present embodiment, Hydraulic Conirol Unit 2 is the hydraulic configuration list of the vehicle frame folding and unfolding buffer unit
Member, Hydraulic Conirol Unit 2 include three-position four-way valve 21, shuttle valve 22, the first one-way throttle valve 25, the second one-way throttle valve 26, the
Connecting pipe between one safety valve 27, the second safety valve 28 and valve and valve.
Specifically, the two of them interface of three-position four-way valve 21 is connected with the system hydraulic circuit of aircraft；Three-position four-way valve
21 another two interface has been respectively communicated with the first oil circuit 23 and the second oil circuit 24, the first oil circuit 23 respectively with the first one-way throttle valve
25 oil inlet 251 is connected to the first oil inlet 221 of shuttle valve 22, the oil outlet 252 of the first one-way throttle valve 25 and first close
Chamber 111 is sealed to be connected to.Second oil circuit 24 is connected to the second oil inlet 222 of shuttle valve 22, and the oil outlet 223 of shuttle valve 22 and second is unidirectionally
The oil inlet 261 of throttle valve 26 is connected to, and the oil outlet 262 of the second one-way throttle valve 26 is connected to the second seal chamber 112.
As shown in fig. 7, shuttle valve 22 is integrated in hydraulic control valve chest 29, including reset spring 224, shuttle valve valve 225,
Cavity 226, and three oil circuits being connected to cavity 223: the first oil inlet 221, the second oil inlet 222 and oil outlet 223.Shuttle
The feature of valve valve 225 are as follows: left and right is the conical surface, is mounted in cavity 226, can form conical surface seal with cavity or so pipeline opening,
225 external cylindrical surface of shuttle valve valve and cavity 226 are clearance seal.Under action of reset spring, which is often placed in the right side
Side, 223 normal open of the first oil inlet 221 and oil outlet, the second oil inlet 222 are closed.When the second oil inlet 222 input hydraulic pressure oil gram
It takes the effect of reset spring 224 and shuttle valve valve 225 is pushed into left side, the second oil inlet 222 is connected with oil outlet 223, the first oil inlet
Mouth 221 is closed.
Wherein, three-position four-way valve 21 controls its position by way of electromagnetism, and three-position four-way valve 21 is placed in difference
Position can realize respectively the vehicle frame folding and unfolding buffer unit in the receipts of vehicle frame, put down, aircraft landing and it is sliding run servo-actuated buffer damping,
And the switching of the functions such as emergency extension of vehicle frame.
Specifically, three-position four-way valve 21 is placed in different location and realizes that the process of above-mentioned function switch is as follows:
As shown in figure 3, when three-position four-way valve 21 is placed in left position, system hydraulic circuit P(oil inlet) connect the first oil circuit 23 after, one
Road is opened the first one-way throttle valve 25 and is entered in first annular seal space 111, and another way opens the second one-way throttle valve after shuttle valve 22
26 enter in the second seal chamber 112, the area of first annular seal space 111 and 112 hydraulic action of the second seal chamber on piston rod 12
Difference, so that piston rod 12 stretches out, and piston rod 12 stretches out so that hydraulic oil in the second seal chamber 112 returns to the via shuttle valve 22
In one seal chamber 111, it is not required to back hydraulic system, therefore can realize the quick stretching of piston rod 12, and exports the liquid for stretching out direction
Compressive load.
In addition 1221 gas pressure of third seal chamber exports gas spring load on piston rod 12, therefore, buffers actuator 1
Output loads are the sum of hydraulic load and gas spring load, and output loads act on vehicle frame 300 and realize that it puts down function.
As shown in figure 4, when three-position four-way valve 21 is placed in right position, system hydraulic circuit P(oil inlet) the second oil circuit 24 is connected,
System oil return road T and the first oil circuit 23 are connected.System oil-way P opens shuttle valve 22 and pushes shuttle valve valve to left side, closes shuttle valve
22 access to the left, then system pressure oil is then opened and is flowed into after the second one-way throttle valve 26 by 22 right wing of shuttle valve
In second seal chamber 112, under hydraulic action, piston rod is to contract and exports drawing load, at the same time, first annular seal space
Oil liquid flows into system oil return road T through the first one-way throttle valve 25 in 111.Buffer the drawing load zone of action motor-car that actuator 1 exports
Realize that its wide-angle receives upper function on frame 300.
As shown in figure 5, the vehicle frame folding and unfolding buffer unit and system hydraulic circuit P are disconnected when three-position four-way valve 21 is placed in middle position
It opens.When the compressive load (aircraft landing or sliding run generate in the process) that piston rod 12 is transmitted by vehicle frame 300, first annular seal space 111
The preset throttle orifice that interior liquid compression is squeezed into the first one-way throttle valve 25, forms hydraulic damping and the impact energy that dissipates, oil
Liquid is through the first one-way throttle valve 25, and a part flows through shuttle valve 22 and the second one-way throttle valve 26 enters in the second seal chamber 112, separately
A part flows into system oil return road T, and piston rod is shunk during oil return.Meanwhile in 12 contraction process of piston rod, third seal chamber
The compression of 1221 inner bodies, absorbs part impact energy.As a result, during aircraft landing and sliding race, realizes and 300 ground of vehicle frame is carried
Vibration caused by lotus excitation carries out buffer damping function.
In the present embodiment, the first oil circuit 23 is also connected to the second seal chamber 112, the first oil circuit 23 and the second seal chamber 112
The first safety valve 27 is serially connected on the oil circuit of connection, to discharge the excessively high pressure of the second seal chamber 112.Symmetrically, the second oil circuit
24 are also connected to first annular seal space 111, are serially connected with the second safety valve on the oil circuit that the second oil circuit 24 is connected to first annular seal space 111
28, to discharge the excessively high pressure of first annular seal space 111.During aircraft landing and sliding race, when piston rod 12 is by great impact
Load effect, so that first annular seal space 111 or 112 inner fluid of the second seal chamber are more than predetermined pressure, the first safety valve 27 or the
Two safety valves 28 open pressure release, and the vehicle frame folding and unfolding buffer unit structure is protected not to be damaged.
As shown in fig. 6, working as system hydraulic failure, three-position four-way valve 21 is placed in middle position, piston rod 12 is in third seal chamber
The effect of 1221 gas pressures is lower to stretch out, and the compression of 112 inner fluid of the second seal chamber flows through the second one-way throttle valve 26, shuttle valve 22, the
One one-way throttle valve 25, into first annular seal space 111, to further piston rod 12 be pushed to stretch out.Vehicle frame folding and unfolding buffering
Device output load push vehicle frame 300, by vehicle frame 300 be lowered into can landing attitude, realize vehicle frame 300 emergency extension.
The above is only the preferred embodiment of the application, not does any type of limitation to the application, although this Shen
Please disclosed as above with preferred embodiment, however not to limit the application, any person skilled in the art is not taking off
In the range of technical scheme, a little variation or modification are made using the technology contents of the disclosure above and is equal to
Case study on implementation is imitated, is belonged in technical proposal scope.
Claims (10)
1. a kind of vehicle frame folding and unfolding buffer unit, which is characterized in that including buffering actuator (1) and Hydraulic Conirol Unit (2)；
The buffering actuator (1) includes outer cylinder (11) and piston rod (12), and one end of the piston rod (12) is equipped with piston
(121), the piston rod (12) be equipped with piston (121) one end be slidedly arranged in the inner cavity of the outer cylinder (11) and with outer cylinder (11)
Bore seal connection, the piston (121) by the inner cavity of the outer cylinder (11) be divided into first annular seal space (111) and second seal
Chamber (112), the sectional area of the first annular seal space (111) are greater than the sectional area of the second seal chamber (112)；
The Hydraulic Conirol Unit (2) includes three-position four-way valve (21) and shuttle valve (22)；The three-position four-way valve (21) and aircraft
System hydraulic circuit be connected；
The three-position four-way valve (21) is communicated with the first oil circuit (23) and the second oil circuit (24), first oil circuit (23) respectively with
First annular seal space (111) is connected to the first oil inlet (221) of shuttle valve (22)；Second oil circuit (24) and the shuttle valve (22)
The second oil inlet (222) connection；The oil outlet (223) of the shuttle valve (22) is connected to the second seal chamber (112).
2. vehicle frame folding and unfolding buffer unit according to claim 1, which is characterized in that when the three-position four-way valve (21) is located at
When left position, first oil circuit (23) is connected to the oil inlet of system hydraulic circuit, and second oil circuit (24) and system are hydraulic
The oil return opening of oil circuit is connected to；
When the three-position four-way valve (21) is located at middle position, first oil circuit (23) and second oil circuit (24) are and system
The oil return opening of hydraulic circuit is connected to；
When the three-position four-way valve (21) is located at right position, the oil return opening of first oil circuit (23) and system hydraulic circuit connects
Logical, second oil circuit (24) is connected to the oil inlet of system hydraulic circuit.
3. vehicle frame folding and unfolding buffer unit according to claim 1 or 2, which is characterized in that the bottom of outer cylinder (11) inner cavity
Portion has the plunger (113) in axial direction extended, and one end that the piston rod (12) protrudes into the outer cylinder (11) inner cavity opens up
Have the first hole (122), the plunger (113) is slidedly arranged in first hole (122) and is tightly connected with the first hole (122), institute
State formation third seal chamber (1221) between the hole wall in the first hole (122) and the end face of the plunger (113), the third sealing
Filled with gas in chamber (1221).
4. vehicle frame folding and unfolding buffer unit according to claim 3, which is characterized in that the plunger (113) protrudes into described
The one end in one hole (122) offers the second hole (1131) being connected to third seal chamber (1221).
5. vehicle frame folding and unfolding buffer unit according to claim 4, which is characterized in that the plunger (113) protrudes into described
The end in one hole (122) is equipped with the sealing element (1132) for sealing the third seal chamber (1221), the hole of first hole (122)
Wall is equipped with the stopping step (1222) for preventing plunger (113) from deviating from, the sealing element (1132) and the stopping step
(1222) cooperate.
6. vehicle frame folding and unfolding buffer unit according to claim 1,2,4 or 5, which is characterized in that first oil circuit (23)
On be also serially connected with the first one-way throttle valve (25), the oil inlet (251) of first one-way throttle valve (25) with described three four
Port valve (21) is connected, and the oil outlet (252) of first one-way throttle valve (25) is connected to the first annular seal space (111).
7. vehicle frame folding and unfolding buffer unit according to claim 6, which is characterized in that the shuttle valve (22) and described second close
It is also serially connected with the second one-way throttle valve (26) on oil circuit between envelope chamber (112), the oil inlet of second one-way throttle valve (26)
Mouthful (261) are connected to the oil outlet (223) of the shuttle valve (22), the oil outlet (262) of second one-way throttle valve (26) and
Second seal chamber (112) connection.
8. according to claim 1, vehicle frame folding and unfolding buffer unit described in 2,4,5 or 6, which is characterized in that first oil circuit
(23) it is also connected to the second seal chamber (112), is concatenated on the oil circuit that first oil circuit (23) is connected to the second seal chamber (112)
There are the first safety valve (27).
9. vehicle frame folding and unfolding buffer unit according to claim 7, which is characterized in that second oil circuit (24) is also with first
Seal chamber (111) is connected to, and is serially connected with the second safety valve on the oil circuit that second oil circuit (24) is connected to first annular seal space (111)
(28).
10. a kind of undercarriage, including damper leg (200) and vehicle frame (300), which is characterized in that further include that right such as is wanted
Ask 1~9 described in any item vehicle frame folding and unfolding buffer units (100), the one end of the piston rod (12) far from the outer cylinder (11)
It is hinged with the vehicle frame (300)；End and the damper leg (200) of the outer cylinder (11) far from the piston rod (12) are cut with scissors
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811248996.2A CN109204787A (en) | 2018-10-25 | 2018-10-25 | Vehicle frame folding and unfolding buffer unit and undercarriage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811248996.2A CN109204787A (en) | 2018-10-25 | 2018-10-25 | Vehicle frame folding and unfolding buffer unit and undercarriage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109204787A true CN109204787A (en) | 2019-01-15 |
Family
ID=64996853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811248996.2A Pending CN109204787A (en) | 2018-10-25 | 2018-10-25 | Vehicle frame folding and unfolding buffer unit and undercarriage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109204787A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110844052A (en) * | 2019-11-04 | 2020-02-28 | 中航飞机起落架有限责任公司 | Undercarriage folding and unfolding actuator cylinder capable of being loaded in delayed mode |
| CN112173085A (en) * | 2020-09-25 | 2021-01-05 | 中国直升机设计研究所 | Hydraulic control system and method for retraction and release of helicopter undercarriage |
| CN113104201A (en) * | 2021-04-30 | 2021-07-13 | 山东大学 | Aircraft nose wheel system of turning and civilian branch line aircraft |
| CN114180036A (en) * | 2021-11-19 | 2022-03-15 | 中国直升机设计研究所 | Integrated retractable landing gear for helicopter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110844052A (en) * | 2019-11-04 | 2020-02-28 | 中航飞机起落架有限责任公司 | Undercarriage folding and unfolding actuator cylinder capable of being loaded in delayed mode |
| CN110844052B (en) * | 2019-11-04 | 2021-04-30 | 中航飞机起落架有限责任公司 | Undercarriage folding and unfolding actuator cylinder capable of being loaded in delayed mode |
| CN112173085A (en) * | 2020-09-25 | 2021-01-05 | 中国直升机设计研究所 | Hydraulic control system and method for retraction and release of helicopter undercarriage |
| CN112173085B (en) * | 2020-09-25 | 2023-03-28 | 中国直升机设计研究所 | Hydraulic control system and method for retraction and release of helicopter undercarriage |
| CN113104201A (en) * | 2021-04-30 | 2021-07-13 | 山东大学 | Aircraft nose wheel system of turning and civilian branch line aircraft |
| CN114180036A (en) * | 2021-11-19 | 2022-03-15 | 中国直升机设计研究所 | Integrated retractable landing gear for helicopter |
| CN114180036B (en) * | 2021-11-19 | 2023-04-18 | 中国直升机设计研究所 | Integrated retractable landing gear for helicopter |
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