CN116039917A - Trolley type landing gear with rotary frame capable of being retracted and extended - Google Patents

Trolley type landing gear with rotary frame capable of being retracted and extended Download PDF

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Publication number
CN116039917A
CN116039917A CN202211634382.4A CN202211634382A CN116039917A CN 116039917 A CN116039917 A CN 116039917A CN 202211634382 A CN202211634382 A CN 202211634382A CN 116039917 A CN116039917 A CN 116039917A
Authority
CN
China
Prior art keywords
connecting rod
frame
buffer
lock tongue
landing gear
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.)
Pending
Application number
CN202211634382.4A
Other languages
Chinese (zh)
Inventor
黄方略
刘远平
范哲
张恒
李晓霏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AVIC Chengdu Aircraft Design and Research Institute
Original Assignee
AVIC Chengdu Aircraft Design and Research Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AVIC Chengdu Aircraft Design and Research Institute filed Critical AVIC Chengdu Aircraft Design and Research Institute
Priority to CN202211634382.4A priority Critical patent/CN116039917A/en
Publication of CN116039917A publication Critical patent/CN116039917A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B64C25/12—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like sideways
    • 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
    • B64C25/20—Operating mechanisms mechanical
    • 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
    • B64C25/26—Control or locking systems therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface 
    • B64C25/34—Alighting gear characterised by elements which contact the ground or similar surface  wheeled type, e.g. multi-wheeled bogies
    • B64C25/36—Arrangements or adaptations of wheels, tyres or axles in general
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface 
    • B64C25/58—Arrangements or adaptations of shock-absorbers or springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface 
    • B64C25/58—Arrangements or adaptations of shock-absorbers or springs
    • B64C25/62—Spring shock-absorbers; Springs
    • 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
    • B64C25/12—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like sideways
    • B64C2025/125—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like sideways into the fuselage, e.g. main landing gear pivotally retracting into or extending out of the fuselage
    • 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
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/40—Weight reduction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention relates to a trolley type undercarriage for folding and unfolding a rotary frame, which comprises a strut buffer, a frame, wheels, a shock-absorbing cylinder, a double-parallelogram mechanism, a folding and unfolding actuating cylinder and a stay bar coordinated pull rod, wherein the strut buffer is arranged on the frame; and the front and the back of the frame are provided with organic wheels. The invention isolates the translation and rotation of the frame by utilizing the inherent characteristics of the motion adder of the double parallelogram mechanism, so that the translation motion of the frame only drives the strut buffer to work, and the rotation motion of the frame only drives the shock absorber to work. The rigid rotation of the frame is transmitted to the shock absorber through the double-parallelogram mechanism, and the strut buffer is not affected. That is, the shock absorber has the function of shock absorption or the function of retraction and extension of the landing gear, and one set of mechanism is used for realizing the two functions.

Description

Trolley type landing gear with rotary frame capable of being retracted and extended
Technical Field
The invention relates to the technical field of aircraft landing gears, in particular to a trolley type landing gear with a rotary frame.
Background
The landing gear is an important functional part of the aircraft, the modern aircraft adopts a retractable landing gear for reducing the aircraft resistance, the landing gear of the aircraft with larger take-off weight needs to adopt a multi-wheel trolley structure to bear larger ground load, the landing gear trolley has larger volume and complex shape, and occupies a large amount of space in the aircraft and the course projection area after being taken up, so that the aircraft resistance is not reduced.
Disclosure of Invention
The invention aims to:
the invention aims to realize smaller occupied space in the landing gear after being retracted and smaller heading projection area.
The technical scheme is as follows:
the trolley type landing gear comprises a strut buffer 1, a frame 2, wheels 4, a shock absorption cylinder 5, a double-parallelogram mechanism 6, a retraction actuator cylinder 7 and a stay bar coordination pull rod 8; the front and rear parts of the frame are provided with organic wheels;
the telescopic end of the strut buffer is hinged with the middle hinging point of the frame, and a front hinging point is arranged between the middle hinging point of the frame and the front end of the frame; an upper hinge point is arranged on the sleeve of the pillar buffer;
the double-parallelogram mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod and a frame;
the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are hinged to form a first parallelogram mechanism, the fourth connecting rod, the fifth connecting rod, the sixth connecting rod and the frame are hinged to form a second parallelogram mechanism, the first connecting rod, the fourth connecting rod and the frame are parallel to each other, the first connecting rod is hinged to the second connecting rod at the upper hinge point, the fifth connecting rod is hinged to the front hinge point of the frame, the sixth connecting rod is hinged to the middle hinge point of the frame, and the first connecting rod is hinged to the third connecting rod at the end of the damper 5; the shock-absorbing cylinder absorbs road shock by being compressed when the strut buffer is located at the supporting position;
the sleeve of the pillar buffer is rotatably connected with the machine body structure, the retraction actuator cylinder 7 is arranged between the sleeve of the pillar buffer and the machine body structure, and the retraction actuator cylinder can drive the pillar buffer to swing between a supporting position and a retraction position;
when the strut buffer is in the supporting position, the telescopic end of the shock-absorbing cylinder 5 is in the maximum extension position, and the end of the shock-absorbing cylinder is more towards the rear frame and the ground relative to the upper hinge point; when the strut buffer swings from the supporting position to the folding position, the distance between the end part and the middle hinging point gradually increases, so that the double parallelograms are folded; when the strut buffer is in the retracted position, the double parallelogram is narrowed to the narrowest.
Further, the body structure is provided with a locking mechanism which locks the strut buffer relative to the body structure when the strut buffer is located at the supporting position, and unlocks when the strut buffer swings to the releasing position.
Further, an unlocking deflector rod 3 is arranged on the pillar buffer, the unlocking deflector rod can swing along with the pillar buffer, and when the pillar buffer swings towards the folding and unfolding position, the deflector rod can be linked to drive the lock tongue to rotate, so that the lock tongue leaves the position blocking the swing of the pillar buffer.
Furthermore, the locking mechanism comprises a lock tongue 8 and a lock tongue connecting rod 9, the end part of the deflector rod is connected with the lock tongue connecting rod, the lock tongue connecting rod is connected with the lock tongue, when the deflector rod moves to the retraction position, the lock tongue connecting rod can be driven to swing, the lock tongue connecting rod swings to enable the lock tongue to be linked, and the lock tongue swings along with the deflector rod to unlock the strut buffer.
Further, a brake device is arranged between the frame and the wheels. Further, the brake device comprises a single-lug interface and a brake connecting rod, wherein the single-lug interface is arranged on the machine wheel and is connected with the brake connecting rod, and the machine wheel can be pulled by the brake connecting rod to realize braking.
Further, the pillar buffer is hinged to the middle hinge point of the frame through double lugs.
Further, the shock absorber is a gas spring damper.
The working process of the trolley type undercarriage for folding and unfolding the frame comprises the following steps:
1. retraction and locking
The rotating frame folding and unfolding trolley type landing gear pushes the prop outer cylinder to fold and unfold by the actuating cylinder.
When the folding and unfolding action starts, the folding and unfolding actuating cylinder pushes the strut buffer to swing forwards and upwards, the shock absorber cannot extend continuously at the maximum stretching position, and the double-parallelogram mechanism is restrained in a pulling mode, so that the double-parallelogram mechanism is gradually combined, and when the folding and unfolding position is reached, the double-parallelogram mechanism is combined into the narrowest state, the folding and unfolding condition of the landing gear space is met, the space of an inner cabin of an occupied aircraft is small, and the projection area along the course is small.
The rotation principle of the frame is the same as that of the frame when the landing gear is put down, the directions are opposite, and the trolley is in a posture that the front wheels are high and the rear wheels are low when the landing gear is put down in place, so that the shock absorber is in a compressed state in the landing shock and running process.
The shock absorber is used as a rigid pull rod for the rotation of the frame in the retraction process, maintains the maximum elongation unchanged under the action of internal air pressure, and is used as the shock absorber in the supporting position.
2. Shock and slide
When the trolley type undercarriage is in a landing state, the rear wheels are firstly grounded, the front wheels are subsequently grounded, the strut is compressed along with the sinking of the airplane, the strut buffer absorbs and dissipates the landing energy of the airplane, and the shock absorber absorbs and dissipates the pitching vibration energy of the frame. The rigid translation of the frame is directly transmitted to the strut buffer through the frame rotating shaft, so that the shock absorber is not affected. The rigid rotation of the frame is transmitted to the shock absorber through the double-parallelogram mechanism, and the strut buffer is not affected.
The technical effects are as follows:
the invention isolates the translation and rotation of the frame by utilizing the inherent characteristics of the motion adder of the double parallelogram mechanism, so that the translation motion of the frame only drives the strut buffer to work, and the rotation motion of the frame only drives the shock absorber to work. The shock absorber of the invention realizes the function of shock absorption or the function of retraction and extension of the landing gear, and realizes two functions by using one set of mechanism.
The characteristics of fixed no-load length of the frame stabilizer are utilized, the frame stabilizer is also used as a cooperative pull rod in the retraction process, the frame is driven to rotate in the retraction process, the frame rotates in place when the frame is in the retraction position, and the landing gear is small in retraction windward area.
By adopting the design of combining the triggering type stay bar lower lock with the stay bar coordination stay bar, the support arm of force of the stay bar to the pillar is good, the load of the intersection point of the landing gear is small, and the occupied space after being taken up is small.
Drawings
FIG. 1a is a schematic diagram of the structure of the present invention;
FIG. 1b is a schematic diagram of the structure of the present invention (different from the view angle of FIG. 1 a);
FIG. 2 is a diagram showing a comparison of the exercise process of the present invention;
FIG. 3a is a schematic diagram of an embodiment of the present invention (a locked state);
FIG. 3b is a schematic diagram of an embodiment of the present invention (unlocked state);
wherein: the bicycle comprises a strut buffer 1, a frame 2, a deflector rod 3, wheels 4, a damper cylinder 5, a double-parallelogram mechanism 6, a retractable actuator cylinder 7, a lock tongue 8 and a lock tongue connecting rod 9.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The trolley type landing gear comprises a strut buffer 1, a frame 2, wheels 4, a shock absorption cylinder 5, a double-parallelogram mechanism 6, a retraction actuator cylinder 7 and a stay bar coordination pull rod 8; the front and rear parts of the frame are provided with organic wheels;
the telescopic end of the strut buffer is hinged with the middle hinging point of the frame, and a front hinging point is arranged between the middle hinging point of the frame and the front end of the frame; an upper hinge point is arranged on the sleeve of the pillar buffer;
the double-parallelogram mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod and a frame;
the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are hinged to form a first parallelogram mechanism, the fourth connecting rod, the fifth connecting rod, the sixth connecting rod and the frame are hinged to form a second parallelogram mechanism, the first connecting rod, the fourth connecting rod and the frame are parallel to each other, the first connecting rod is hinged to the second connecting rod at the upper hinge point, the fifth connecting rod is hinged to the front hinge point of the frame, the sixth connecting rod is hinged to the middle hinge point of the frame, and the first connecting rod is hinged to the third connecting rod at the end of the damper 5; the shock-absorbing cylinder absorbs road shock by being compressed when the strut buffer is located at the supporting position;
the sleeve of the pillar buffer is rotatably connected with the machine body structure, the retraction actuator cylinder 7 is arranged between the sleeve of the pillar buffer and the machine body structure, and the retraction actuator cylinder can drive the pillar buffer to swing between a supporting position and a retraction position;
when the strut buffer is in the supporting position, the telescopic end of the shock-absorbing cylinder 5 is in the maximum extension position, and the end of the shock-absorbing cylinder is more towards the rear frame and the ground relative to the upper hinge point; when the strut buffer swings from the supporting position to the folding position, the distance between the end part and the middle hinging point gradually increases, so that the double parallelograms are folded; when the strut buffer is in the retracted position, the double parallelogram is narrowed to the narrowest.
The body structure is provided with a locking mechanism, when the pillar buffer is positioned at the supporting position, the locking mechanism locks and locks the pillar buffer relative to the body structure, and when the pillar buffer swings towards the folding and unfolding position, the locking mechanism unlocks the pillar buffer.
The unlocking deflector rod 3 is arranged on the pillar buffer, the unlocking deflector rod can swing along with the pillar buffer, and when the pillar buffer swings towards the folding and unfolding position, the deflector rod can be linked to drive the lock tongue to rotate, so that the lock tongue leaves the position blocking the swing of the pillar buffer.
The locking mechanism comprises a lock tongue 8 and a lock tongue connecting rod 9, the end part of the deflector rod is connected with the lock tongue connecting rod, the lock tongue connecting rod is connected with the lock tongue, the lock tongue connecting rod can be driven to swing when the deflector rod moves to the retraction position, the lock tongue connecting rod swings to enable the lock tongue to be linked, and the lock tongue swings along with the deflector rod to unlock the strut buffer.
And a braking device is arranged between the frame and the wheels. The brake device comprises a single-lug interface and a brake connecting rod, wherein the single-lug interface is arranged on the machine wheel and is connected with the brake connecting rod, and the machine wheel can be pulled to realize braking through the brake connecting rod.
The pillar buffer is hinged with the middle hinge point of the frame through double lugs.
The shock absorber is a gas spring damper.
The foregoing is merely a detailed description of the invention, which is not a matter of routine skill in the art. However, the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. The utility model provides a dolly type undercarriage that rotation frame received and released which characterized in that: comprises a pillar buffer, a frame, wheels, a shock-absorbing cylinder, a double-parallelogram mechanism, a retractable actuating cylinder and a stay bar coordinated pull rod; the front and rear parts of the frame are provided with organic wheels;
the telescopic end of the strut buffer is hinged with the middle hinging point of the frame, and a front hinging point is arranged between the middle hinging point of the frame and the front end of the frame; an upper hinge point is arranged on the sleeve of the pillar buffer;
the double-parallelogram mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod and a frame;
the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are hinged to form a first parallelogram mechanism, the fourth connecting rod, the fifth connecting rod, the sixth connecting rod and the frame are hinged to form a second parallelogram mechanism, the first connecting rod, the fourth connecting rod and the frame are parallel to each other, the first connecting rod is hinged to the second connecting rod at the upper hinge point, the fifth connecting rod is hinged to the front hinge point of the frame, the sixth connecting rod is hinged to the middle hinge point of the frame, and the first connecting rod is hinged to the end of the shock absorption cylinder; the shock-absorbing cylinder absorbs road shock by being compressed when the strut buffer is located at the supporting position;
the sleeve of the pillar buffer is rotatably connected with the machine body structure, the retractable actuating cylinder is arranged between the sleeve of the pillar buffer and the machine body structure, and the retractable actuating cylinder can drive the pillar buffer to swing between a supporting position and a retractable position;
when the strut buffer is positioned at the supporting position, the telescopic end of the shock absorption cylinder is positioned at the maximum extension position, and the end part of the shock absorption cylinder is more towards the rear frame and the ground relative to the upper hinge point; when the strut buffer swings from the supporting position to the folding position, the distance between the end part and the middle hinging point gradually increases, so that the double parallelograms are folded; when the strut buffer is in the retracted position, the double parallelogram is narrowed to the narrowest.
2. A trolley landing gear for retraction of a rotating frame as claimed in claim 1 wherein: the body structure is provided with a locking mechanism, when the pillar buffer is positioned at the supporting position, the locking mechanism locks and locks the pillar buffer relative to the body structure, and when the pillar buffer swings towards the folding and unfolding position, the locking mechanism unlocks the pillar buffer.
3. A trolley landing gear for retraction of a rotating frame as claimed in claim 1 wherein: the lock comprises a support buffer, and is characterized in that an unlocking deflector rod is arranged on the support buffer, the unlocking deflector rod can swing along with the support buffer, and when the support buffer swings towards the retraction position, the deflector rod can be linked to drive a lock tongue to rotate, so that the lock tongue leaves the position blocking the swing of the support buffer.
4. A trolley landing gear for retraction of a swivel frame as claimed in claim 3 wherein: the locking mechanism comprises a lock tongue and a lock tongue connecting rod, the end part of the deflector rod is connected with the lock tongue connecting rod, the lock tongue connecting rod is connected with the lock tongue, the lock tongue connecting rod can be driven to swing when the deflector rod moves to the retraction position, the lock tongue connecting rod swings to enable the lock tongue to be linked, and the lock tongue swings along with the deflector rod to unlock the strut buffer.
5. A trolley landing gear for retraction of a rotating frame as claimed in claim 1 wherein: and a braking device is arranged between the frame and the wheels.
6. The dolly landing gear of claim 5 wherein the rotating frame is retractable, wherein: the brake device comprises a single-lug interface and a brake connecting rod, wherein the single-lug interface is arranged on the machine wheel and is connected with the brake connecting rod, and the machine wheel can be pulled to realize braking through the brake connecting rod.
7. A trolley landing gear for retraction of a rotating frame as claimed in claim 1 wherein: the pillar buffer is hinged with the middle hinge point of the frame through double lugs.
8. A trolley landing gear for retraction of a rotating frame as claimed in claim 1 wherein: the shock absorber is a gas spring damper.
CN202211634382.4A 2022-12-19 2022-12-19 Trolley type landing gear with rotary frame capable of being retracted and extended Pending CN116039917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211634382.4A CN116039917A (en) 2022-12-19 2022-12-19 Trolley type landing gear with rotary frame capable of being retracted and extended

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211634382.4A CN116039917A (en) 2022-12-19 2022-12-19 Trolley type landing gear with rotary frame capable of being retracted and extended

Publications (1)

Publication Number Publication Date
CN116039917A true CN116039917A (en) 2023-05-02

Family

ID=86124664

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211634382.4A Pending CN116039917A (en) 2022-12-19 2022-12-19 Trolley type landing gear with rotary frame capable of being retracted and extended

Country Status (1)

Country Link
CN (1) CN116039917A (en)

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