A retractable trolley-type landing gear with a rotating frame

Abstract

The present invention relates to a trolley-type landing gear with a retractable rotating frame, comprising a strut buffer, a frame, wheels, shock absorber cylinders, a double parallelogram mechanism, a retractable actuator cylinder, and a strut coordination rod; the frame is equipped with wheels at the front and rear. By utilizing the inherent characteristics of the motion adder of the double parallelogram mechanism, the present invention isolates the translational and rotational motions of the frame from each other, so that the translational motion of the frame only drives the strut buffers, and the rotational motion of the frame only drives the shock absorbers. The rigid body rotation of the frame is transmitted to the shock absorber via the double parallelogram mechanism and does not affect the strut buffer. In other words, the shock absorber not only performs the function of shock absorption but also performs the function of retracting and extending the landing gear, achieving both functions using a single mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft landing gears, in particular to a retractable trolley-type landing gear with a rotating frame. Background Art

[0002] The landing gear is an important functional component of an aircraft. In order to reduce aircraft drag, modern aircraft mostly use retractable landing gear. The landing gear of aircraft with a larger take-off weight needs to adopt a multi-wheel trolley structure to carry a larger ground load. The landing gear trolley is large in size and complex in shape. When retracted, it will occupy a large amount of space inside the aircraft and the heading projection area, which is not conducive to reducing aircraft drag. Summary of the Invention

[0003] Purpose of the invention:

[0004] The present invention aims to achieve smaller interior space occupied after the landing gear is retracted and a smaller heading projection area.

[0005] Technical solution:

[0006] A trolley-type landing gear with a retractable rotating frame is provided, comprising a strut buffer 1, a frame 2, wheels 4, a shock absorber 5, a double parallelogram mechanism 6, a retractable actuator 7, and a strut coordination rod 8; wheels are mounted at the front and rear of the frame;

[0007] The telescopic end of the pillar buffer is hinged to the middle hinge point of the frame, and a front hinge point is provided between the middle hinge point of the frame and the front end of the frame; an upper hinge point is provided on the sleeve of the pillar buffer;

[0008] The double parallelogram mechanism includes a first link, a second link, a third link, a fourth link, a fifth link, a sixth link and a frame;

[0009] The first link, the second link, the third link and the fourth link are hinged to form a first parallelogram mechanism, and the fourth link, the fifth link, the sixth link and the frame are hinged to form a second parallelogram mechanism, wherein the first link, the four links and the frame are parallel to each other, and the first link and the second link are hinged to the upper hinge point, the fifth link is hinged to the front hinge point of the frame, and the sixth link is hinged to the middle hinge point of the frame, and the first link and the third link are hinged to the end of the shock absorber cylinder 5; the shock absorber cylinder absorbs road vibration by being compressed when the strut buffer is in the supporting position;

[0010] The sleeve of the pillar buffer is rotatably connected to the body structure, and the retractable actuator 7 is provided between the sleeve of the pillar buffer and the body structure, and the retractable actuator can drive the pillar buffer to swing between the supporting position and the retracted position;

[0011] When the pillar buffer is in the supporting position, the telescopic end of the shock absorber cylinder 5 is in the maximum extension position, and the end of the shock absorber cylinder is closer to the rear frame and the ground relative to the upper hinge point; when the pillar buffer swings from the supporting position to the retracted position, the distance between the end and the middle hinge point gradually increases, so that the double parallelogram is retracted; when the pillar buffer is in the retracted position, the double parallelogram is retracted to the narrowest.

[0012] Furthermore, the body structure is provided with a locking mechanism, which locks the pillar buffer relative to the body structure when the pillar buffer is located at the supporting position, and is unlocked when the pillar buffer swings toward the retracted position.

[0013] Furthermore, an unlocking lever 3 is provided on the pillar buffer, and the unlocking lever can swing with the pillar buffer. When the pillar buffer swings toward the retracted position, the lever can drive the lock tongue to rotate in a linked manner, so that the lock tongue leaves the position that blocks the pillar buffer from swinging.

[0014] Furthermore, the locking mechanism includes a lock tongue 8 and a lock tongue link 9. The end of the lever is connected to the lock tongue link, and the lock tongue link is connected to the lock tongue. When the lever moves to the retracted position, the lock tongue link is driven to swing. The swing of the lock tongue link causes the lock tongue to be linked, and the lock tongue unlocks the pillar buffer as the lever swings.

[0015] Furthermore, a brake device is provided between the frame and the wheel. Furthermore, the brake device includes a single-ear interface and a brake connecting rod, wherein the single-ear interface is provided on the wheel and is connected to the brake connecting rod, and the wheel can be pulled by the brake connecting rod to realize braking.

[0016] Furthermore, the pillar buffer is hinged to the middle hinge point of the frame through a double ear piece.

[0017] Furthermore, the shock absorber is a gas spring damper.

[0018] The working process of the retractable trolley landing gear includes the following aspects:

[0019] 1. Retraction and locking

[0020] The retractable trolley type landing gear of the rotating frame is retracted or extended by pushing the outer cylinder of the support column by the actuator cylinder.

[0021] When the landing gear retraction action begins, the retraction actuator pushes the strut buffer to swing forward and upward. The shock absorber cannot continue to extend at the maximum stretching position, forming a tensile constraint on the double parallelogram mechanism, causing the double parallelogram mechanism to gradually merge. When reaching the retracted position, the double parallelogram mechanism merges into the narrowest state, meeting the landing gear space retraction conditions, occupying a small space in the aircraft's internal cabin, and having a small projected area along the heading direction.

[0022] When the landing gear is lowered, the frame rotation principle is the same as that of retracting it, but in the opposite direction. When it is lowered into place, the car is in a posture with the front wheels high and the rear wheels low, ensuring that the shock absorbers are in a compressed state during landing and taxiing.

[0023] The shock absorber acts as a rigid pull rod for the frame rotation during the retraction and extension process. Under the action of internal air pressure, the maximum extension is maintained unchanged, and it acts as a shock absorber when in the support position.

[0024] 2. Drop and slide

[0025] When the rotating frame retractable trolley landing gear is dropped, the rear wheels touch the ground first, followed by the front wheels. As the aircraft sinks, the struts compress, the strut buffers absorb and dissipate the aircraft's drop energy, and the shock absorbers absorb and dissipate the frame's pitch vibration energy. The frame's rigid body translation is directly transmitted to the strut buffers via the frame's rotating shaft, without affecting the shock absorbers. The frame's rigid body rotation is transmitted to the shock absorbers via a double parallelogram mechanism, without affecting the strut buffers.

[0026] Technical effect:

[0027] The present invention utilizes the inherent properties of the motion adder of a dual parallelogram mechanism to isolate the translational and rotational motions of the vehicle frame. This allows the translational motion of the frame to drive only the strut buffers, while the rotational motion of the frame drives only the shock absorbers. The shock absorbers in this invention not only provide shock absorption but also retract and extend the landing gear, achieving both functions using a single mechanism.

[0028] Taking advantage of the fixed unloaded length of the frame stabilizer, it also serves as a cooperative pull rod during the retraction and extension process, driving the frame to rotate during the retraction and extension process. When the frame is in the retracted position, it rotates into place and the windward area of ​​the landing gear is small when it is retracted.

[0029] By adopting a trigger-type strut lower lock combined with a strut coordinated pull rod design, the strut has a good supporting force arm for the pillar, the landing gear intersection load is small, and the space occupied when retracted is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1a It is a structural schematic diagram of the present invention;

[0031] Figure 1b A schematic diagram of the structure of the present invention (with Figure 1a different perspectives);

[0032] Figure 2 This is a comparison diagram of the motion process of the present invention;

[0033] Figure 3a Schematic diagram of the structure of an embodiment of the present invention (locked state);

[0034] Figure 3b Schematic diagram of the structure of an embodiment of the present invention (unlocked state);

[0035] Among them: support buffer 1, frame 2, shift rod 3, machine wheel 4, shock absorber 5, double parallelogram mechanism 6, retractable actuator 7, lock tongue 8, lock tongue connecting rod 9. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] A trolley-type landing gear with a retractable rotating frame is provided, comprising a strut buffer 1, a frame 2, wheels 4, a shock absorber 5, a double parallelogram mechanism 6, a retractable actuator 7, and a strut coordination rod 8; wheels are mounted at the front and rear of the frame;

[0038] The telescopic end of the pillar buffer is hinged to the middle hinge point of the frame, and a front hinge point is provided between the middle hinge point of the frame and the front end of the frame; an upper hinge point is provided on the sleeve of the pillar buffer;

[0039] The double parallelogram mechanism includes a first link, a second link, a third link, a fourth link, a fifth link, a sixth link and a frame;

[0040] The first link, the second link, the third link and the fourth link are hinged to form a first parallelogram mechanism, and the fourth link, the fifth link, the sixth link and the frame are hinged to form a second parallelogram mechanism, wherein the first link, the four links and the frame are parallel to each other, and the first link and the second link are hinged to the upper hinge point, the fifth link is hinged to the front hinge point of the frame, and the sixth link is hinged to the middle hinge point of the frame, and the first link and the third link are hinged to the end of the shock absorber cylinder 5; the shock absorber cylinder absorbs road vibration by being compressed when the strut buffer is in the supporting position;

[0041] The sleeve of the pillar buffer is rotatably connected to the body structure, and the retractable actuator 7 is provided between the sleeve of the pillar buffer and the body structure, and the retractable actuator can drive the pillar buffer to swing between the supporting position and the retracted position;

[0042] When the pillar buffer is in the supporting position, the telescopic end of the shock absorber cylinder 5 is in the maximum extension position, and the end of the shock absorber cylinder is closer to the rear frame and the ground relative to the upper hinge point; when the pillar buffer swings from the supporting position to the retracted position, the distance between the end and the middle hinge point gradually increases, so that the double parallelogram is retracted; when the pillar buffer is in the retracted position, the double parallelogram is retracted to the narrowest.

[0043] The body structure is provided with a locking mechanism. When the pillar buffer is located at the supporting position, the locking mechanism locks the pillar buffer relative to the body structure, and is unlocked when the pillar buffer swings toward the retracted position.

[0044] The pillar buffer is provided with an unlocking lever 3, which can swing with the pillar buffer. When the pillar buffer swings toward the retracted position, the unlocking lever can drive the lock tongue to rotate in a linked manner, so that the lock tongue leaves the position that blocks the pillar buffer from swinging.

[0045] The locking mechanism includes a lock tongue 8 and a lock tongue connecting rod 9. The end of the shift rod is connected to the lock tongue connecting rod, and the lock tongue connecting rod is connected to the lock tongue. When the shift rod moves to the retracted position, the lock tongue connecting rod will be driven to swing. The swing of the lock tongue connecting rod causes the lock tongue to be linked, and the lock tongue unlocks the pillar buffer as the shift rod swings.

[0046] A brake device is provided between the frame and the wheel. The brake device comprises a single-ear interface and a brake connecting rod. The single-ear interface is provided on the wheel and is connected to the brake connecting rod. The wheel can be pulled by the brake connecting rod to realize braking.

[0047] The pillar buffer is hinged to the middle hinge point of the vehicle frame through a double-ear piece.

[0048] The shock absorber is a gas spring damper.

[0049] The above description is merely a detailed description of specific embodiments of the present invention. Any unspecified portions are conventional techniques. However, the scope of the present invention is not limited thereto. Any changes or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be encompassed within the scope of the present invention. The scope of the present invention shall be determined by the scope of the claims.

Claims

1. A trolley-type landing gear with a retractable rotating frame, characterized in that: It includes a support buffer, a vehicle frame, a wheel, a shock absorber, a double parallelogram mechanism, a retractable actuator and a support rod coordination rod; the vehicle frame is equipped with wheels at the front and rear; The telescopic end of the pillar buffer is hinged to the middle hinge point of the frame, and a front hinge point is provided between the middle hinge point of the frame and the front end of the frame; an upper hinge point is provided on the sleeve of the pillar buffer; The double parallelogram mechanism includes a first link, a second link, a third link, a fourth link, a fifth link, a sixth link and a frame; The first link, the second link, the third link and the fourth link are hinged to form a first parallelogram mechanism, and the fourth link, the fifth link, the sixth link and the frame are hinged to form a second parallelogram mechanism, wherein the first link, the four links and the frame are parallel to each other, and the first link and the second link are hinged to the upper hinge point, the fifth link is hinged to the front hinge point of the frame, and the sixth link is hinged to the middle hinge point of the frame, and the first link and the third link are hinged to the end of the shock absorber cylinder; the shock absorber cylinder absorbs road vibration by being compressed when the strut buffer is in the supporting position; The sleeve of the pillar buffer is rotatably connected to the vehicle frame, and the retractable actuator is provided between the sleeve of the pillar buffer and the vehicle frame, and the retractable actuator can drive the pillar buffer to swing between a supporting position and a retracted position; When the strut buffer is in the supporting position, the telescopic end of the shock absorber cylinder is in the maximum extension position, and the end of the shock absorber cylinder is closer to the rear frame and the ground relative to the upper hinge point; when the strut buffer swings from the supporting position to the retracted position, the distance between the end and the middle hinge point gradually increases, so that the double parallelogram is retracted; when the strut buffer is in the retracted position, the double parallelogram is retracted to the narrowest position; The frame is provided with a locking mechanism, which locks the pillar buffer relative to the frame when the pillar buffer is in the supporting position and unlocks when the pillar buffer swings toward the retracted position; The pillar buffer is provided with an unlocking lever, which can swing with the pillar buffer. When the pillar buffer swings toward the retracted position, the unlocking lever can drive the lock tongue to rotate in a linked manner, so that the lock tongue leaves the position that blocks the pillar buffer from swinging; The locking mechanism includes a lock tongue and a lock tongue connecting rod. The end of the shift rod is connected to the lock tongue connecting rod, and the lock tongue connecting rod is connected to the lock tongue. When the shift rod moves to the retracted position, the lock tongue connecting rod will be driven to swing. The swing of the lock tongue connecting rod causes the lock tongue to be linked, and the lock tongue unlocks the pillar buffer as the shift rod swings.

2. The trolley-type landing gear with a retractable rotating frame according to claim 1, characterized in that: A brake device is provided between the frame and the wheel.

3. The trolley-type landing gear with a retractable rotating frame according to claim 2, characterized in that: The brake device includes a single-ear interface and a brake connecting rod. The single-ear interface is arranged on the wheel and is connected to the brake connecting rod. The wheel can be pulled by the brake connecting rod to achieve braking.

4. The trolley-type landing gear with a retractable rotating frame according to claim 1, characterized in that: The pillar buffer is hinged to the middle hinge point of the vehicle frame through a double-ear piece.

5. The trolley-type landing gear with a retractable rotating frame according to claim 1, characterized in that: The shock absorbing cylinder is a gas spring damper.

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