Seaplane landing gear and damping method thereof

Abstract

The invention relates to a seaplane landing gear and a damping method thereof, and belongs to the technical field of aircraft landing gear, the landing gear comprises a rack, a damping connecting rod, a driving rod and a connecting rod which are mutually hinged to form a four-connecting-rod mechanism, and a damper is hinged to the four-connecting-rod mechanism; the two ends of the shock absorber are hinged to the shock absorption connecting rod and the rack respectively. The hinge point of the shock absorber and the shock-absorbing connecting rod is close to the hinge point of the shock-absorbing connecting rod and the rack; the buoy connecting piece is hinged to the driving rod, and after the buoy is impacted, the buoy is driven by the four-connecting-rod mechanism through the buoy connecting piece to do curve shock-proof motion. The seaplane landing gear provided by the invention has shock resistance, and can allow the included angle between the buoy and the water surface to be smaller and the view to be better during landing. Meanwhile, the four-connecting-rod mechanism can enable the buoy to move along a large-curvature curve during jolting, and the contraction efficiency in the vertical direction is far higher than that of oblique linear motion of a single-shock-absorbing-cylinder structure.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft landing gear, and in particular relates to a seaplane landing gear and a shock reduction method thereof, which is based on a curved shock-absorbing stroke of a four-link structure. Background Art

[0002] Seaplanes are modern aircraft that use water surfaces, including oceans, lakes and rivers, as take-off, landing and anchoring locations. They can travel and fly on rivers, lakes, oceans and other water surfaces without being restricted by terrain and roads, and are used for maritime patrols, anti-submarine operations, military rescue operations and military transport and supply. At the same time, they can also be used as a convenient commuting and transportation tool, connecting the transportation network between various islands or waters, and can also be used for sightseeing.

[0003] The design principle of seaplane landing gear is different from that of ordinary aircraft landing gear, mainly reflected in its adaptability to the water environment. Seaplanes need to have stable floating and take-off and landing capabilities on the water.

[0004] The current landing gear design of seaplanes is mainly based on floats, supplemented by hard-connected landing gear structures. As the core landing gear component of seaplanes, the float design ensures the stable floating of the aircraft on the water with its unique shape and material selection. The float not only provides sufficient buoyancy to support the weight of the entire aircraft, but also reduces the resistance when gliding on the water surface through its streamlined design, thereby improving the maneuverability of the aircraft. However, the current structure of seaplane landing gear is mainly based on hard connections and does not have shock absorption capabilities; at the same time, due to the structure of the floats that are larger in front and smaller in the back, in order to ensure the safety of landing, the hard-connected landing gear will cause the nose to rise, thereby affecting the pilot's field of vision during landing. In addition, the hard connection has poor response to waves, and has high requirements for the water surface state during takeoff and landing. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a seaplane landing gear and a shock absorbing method thereof, which have high shock absorbing efficiency, more supports and strong rigidity.

[0006] A seaplane landing gear comprises a frame, a shock absorbing connecting rod, a driving rod and a connecting rod which are hinged to each other to form a four-bar linkage. A shock absorber is hinged on the four-bar linkage. A buoy connecting piece is hinged on the driving rod. After the buoy is impacted, the buoy performs a curved shock absorbing motion under the drive of the four-bar linkage through the buoy connecting piece.

[0007] The shock-absorbing connecting rod, the driving rod and the connecting rod are hinged at the head and tail, and the head end of the shock-absorbing connecting rod and the tail end of the connecting rod are hinged to the frame.

[0008] The through hole of the buoy connector coincides with the notch through hole on the driving rod body and is connected by plugging bolts; the hinge point between the buoy connector and the driving rod is close to the hinge point between the driving rod and the shock-absorbing connecting rod.

[0009] The frame has a hollow cavity inside, and the body connecting piece is inserted into the cavity of the frame from one end of the frame.

[0010] The shock absorber is inserted into the frame through a through hole at the other end of the frame, and both ends of the shock absorber are respectively hinged on the shock absorbing connecting rod and the frame; the hinge point between the shock absorber and the shock absorbing connecting rod is close to the hinge point between the shock absorbing connecting rod and the frame.

[0011] The hinge point between the connecting rod and the frame is located between the hinge points at both ends of the shock absorber.

[0012] A shock absorbing method for a seaplane landing gear adopts the above-mentioned seaplane landing gear, which is specifically as follows:

[0013] The buoy connector is connected to the buoy, and the landing gear of the seaplane is in an extended state; after the buoy is impacted, the buoy connector drives the driving rod to move upward; the two ends of the driving rod are restricted by the shock-absorbing connecting rod and the connecting rod, and the shock-absorbing connecting rod, the connecting rod, and the buoy connector make circular motions; the sum of the three circular motions, while the connection between the driving rod and the buoy connector moves upward, is affected by the rotation of the shock-absorbing connecting rod and the driving rod, and a small deviation occurs in the direction of the hinge point of the driving rod and the connecting rod. After the two motion states are fitted, the buoy makes a large curvature curve shock-absorbing motion.

[0014] The beneficial effects of the present invention are:

[0015] The seaplane landing gear provided by the invention has shock-absorbing property, can allow the angle between the float and the water surface to be smaller during landing, and has a better field of vision.

[0016] The shock-absorbing capability of the seaplane landing gear provided by the present invention can reduce the turbulence of the aircraft when encountering sea waves, thereby improving the safety of the aircraft during take-off and landing.

[0017] The present invention uses a connecting rod and a frame shell as the main load-bearing structure and has a built-in shock absorber. Compared with a conventional single shock absorber tube structure, the torsional rigidity is stronger and the shock absorber can be protected to extend the service life.

[0018] The four-link mechanism of the seaplane landing gear provided by the present invention can make the buoy move along a large curvature curve when bumping, and the contraction efficiency in the vertical direction is much higher than the oblique linear movement of the single shock-absorbing tube structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the seaplane landing gear of the present invention in the deployed state;

[0020] Figure 2It is a schematic diagram of the compressed state of the landing gear of the seaplane of the present invention;

[0021] Figure 3 It is a schematic diagram of the explosion of the landing gear of the seaplane of the present invention;

[0022] Figure 4 is a fitted line diagram of the seaplane landing gear deployment state of the present invention;

[0023] Figure 5 It is a fitting line of the compression state of the landing gear of the seaplane of the present invention and a motion trajectory diagram of the buoy connecting member during the compression process (wherein the dotted line is the trajectory);

[0024] in,

[0025] 1. Fuselage connector, 2. Frame, 3. Shock absorber, 4. Shock absorber connecting rod, 5. Connecting rod, 6. Driving rod, 7. Float connector, 8. Plug bolt. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0027] like Figure 1-3 As shown, a landing gear of a seaplane includes a frame 2, a shock-absorbing connecting rod 4, a driving rod 6 and a connecting rod 5 which are hinged to each other, forming a four-bar linkage. The shock-absorbing connecting rod 4, the driving rod 6 and the connecting rod 5 are hinged head to tail, the head end of the shock-absorbing connecting rod 4 and the tail end of the connecting rod 5 are hinged to the frame 2, the buoy connecting member 7 is hinged to the driving rod 6, the through hole of the buoy connecting member 7 coincides with the notch through hole on the rod body of the driving rod 6, and is connected by a plug bolt 8; the hinge point of the buoy connecting member 7 and the driving rod 6 is close to the hinge point of the driving rod 6 and the shock-absorbing connecting rod 4.

[0028] The frame 2 has a hollow cavity inside, and the fuselage connector 1 is inserted into the cavity of the frame 2 from one end of the frame 2 and fixed by plug bolts 8. The shock absorber 3 is inserted into the frame 2 through the through hole at the other end of the frame 2, and the two ends of the shock absorber 3 are respectively hinged on the shock absorbing connecting rod 4 and the frame 2, wherein the ear hole at one end of the shock absorber 3 coincides with the middle through hole of the frame 2, and is connected by plug bolts 8, and the connection hole at the other end of the shock absorber 3 coincides with the connection through hole on the rod body of the shock absorbing connecting rod 4, and is connected by plug bolts 8. The hinge point of the shock absorber 3 and the shock absorbing connecting rod 4 is close to the hinge point of the shock absorbing connecting rod 4 and the frame 2.

[0029] The through hole at one end of the shock-absorbing connecting rod 4 close to the connecting through hole coincides with the slotted through hole of the frame 2, and is connected by a plug bolt 8. The through hole at the other end of the shock-absorbing connecting rod 4 coincides with the slotted through hole at the end of the driving rod 6, and is connected by a plug bolt 8; the through hole at the other end of the driving rod 6 coincides with the through hole at one end of the connecting rod 5, and is connected by a plug bolt 8; the through hole at the other end of the connecting rod 5 coincides with the through hole of the hanging ear of the frame 2, and is connected by a plug bolt 8; the hinge point of the connecting rod 5 and the frame 2 is located between the hinge points at both ends of the shock absorber 3.

[0030] The shock absorbing method of the above-mentioned seaplane landing gear is as follows:

[0031] The buoy connector 7 is connected to the buoy, and the landing gear of the seaplane is in an unfolded state. Figure 1 As shown, the fitting line diagram is as follows Figure 4 As shown; after the buoy is impacted, the driving rod 6 will be driven by the buoy connector 7 to move upward, that is, toward the frame 2; both ends of the driving rod 6 are restricted by the shock-absorbing connecting rod 4 and the connecting rod 5, and the shock-absorbing connecting rod 4 moves in a circle with the hinge point with the frame 2 as the center and the length of the shock-absorbing connecting rod 4 itself; at the same time, the connecting rod 5 moves in a circle with the hinge point with the frame 2 as the center and the length of the connecting rod 5 itself as the radius. For the buoy connector 7, the buoy connector 7 performs a circular motion with the hinge point between the buoy connector 7 and the driving rod 6 as the center and the distance from the center to the hinge point between the buoy connector 7 and the shock absorbing connecting rod 4 as the radius. Under the addition of the above three circular motions, while the connection between the driving rod 6 and the buoy connector 7 moves upward, it will be slightly offset in the direction of the hinge point between the driving rod 6 and the connecting rod 5 under the influence of the rotation of the shock absorbing connecting rod 4 and the driving rod 6. After the two motion states are fitted, the buoy will have a motion trajectory with a large curvature curve, and perform a curved shock-absorbing motion to achieve the purpose of high retraction efficiency. The state of the seaplane landing gear after retraction is as follows: Figure 2 As shown, the fitting line and trajectory are as follows Figure 5 As shown; during the entire movement process, the shock absorber 3 absorbs the transmitted energy to achieve the purpose of shock absorption.

Claims

1. A seaplane landing gear, characterized in that: It includes a frame, a shock-absorbing connecting rod, a driving rod and a connecting rod that are hinged to each other, forming a four-bar linkage, on which a shock absorber is hinged; a buoy connecting piece is hinged on the driving rod, and after the buoy is impacted, the buoy performs a curved shock-absorbing motion driven by the four-bar linkage through the buoy connecting piece.

2. A seaplane landing gear according to claim 1, characterized in that: The shock-absorbing connecting rod, the driving rod and the connecting rod are hinged at the head and tail, and the head end of the shock-absorbing connecting rod and the tail end of the connecting rod are hinged to the frame.

3. A seaplane landing gear according to claim 2, characterized in that: The through hole of the buoy connector coincides with the notch through hole on the driving rod body and is connected by plugging bolts; the hinge point between the buoy connector and the driving rod is close to the hinge point between the driving rod and the shock-absorbing connecting rod.

4. A seaplane landing gear according to claim 1, characterized in that: The frame has a hollow cavity inside, and the body connecting piece is inserted into the cavity of the frame from one end of the frame.

5. A seaplane landing gear according to claim 4, characterized in that: The shock absorber is inserted into the frame through a through hole at the other end of the frame, and both ends of the shock absorber are respectively hinged on the shock absorbing connecting rod and the frame; the hinge point between the shock absorber and the shock absorbing connecting rod is close to the hinge point between the shock absorbing connecting rod and the frame.

6. A seaplane landing gear according to claim 1, characterized in that: The hinge point between the connecting rod and the frame is located between the hinge points at both ends of the shock absorber.

7. A method for reducing shock of a seaplane landing gear, using a seaplane landing gear as claimed in any one of claims 1 to 6, characterized in that: The details are as follows: The buoy connector is connected to the buoy, and the landing gear of the seaplane is in an extended state; after the buoy is impacted, the buoy connector drives the driving rod to move upward; the two ends of the driving rod are restricted by the shock-absorbing connecting rod and the connecting rod, and the shock-absorbing connecting rod, the connecting rod, and the buoy connector make circular motions; the sum of the three circular motions, while the connection between the driving rod and the buoy connector moves upward, is affected by the rotation of the shock-absorbing connecting rod and the driving rod, and a small deviation occurs in the direction of the hinge point of the driving rod and the connecting rod. After the two motion states are fitted, the buoy makes a large curvature curve shock-absorbing motion.

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