Aircraft front wheel retracting brake device

Abstract

This invention discloses a nose wheel retraction braking device for aircraft. It includes a friction speed reducer mounting base (5), the upper surface of which is hinged to the lower end of a spring rod (6), the upper end of which is hinged to a spring rod connecting support (8) fixed to the aircraft; the lower end of the friction speed reducer mounting base (5) is hinged to a friction speed reducer connecting support (10) fixed to the aircraft; and a friction speed reducer (3) is fixed to the lower surface of the friction speed reducer mounting base (5). This invention ensures rapid braking of the nose wheel after it retracts off the ground, and the braking device needs to be simple, reliable, and easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of aircraft structural design technology, and in particular to an aircraft nose wheel retractable brake device. Background Technology

[0002] As the role of landing gear in modern aircraft design becomes increasingly prominent, designers face new challenges: to design the safest and most reliable landing gear using the lightest and most compact structure. To reduce aircraft system weight, simplify system complexity, and save system costs, most aircraft, especially light aircraft, currently do not use braked nose wheels. Because the nose wheel lacks a braking device, after the nose landing gear retracts, it can only gradually decelerate due to inertia, relying solely on air resistance and axle friction, requiring a considerable amount of time to stop rotating. Since the nose wheel is usually located very close to the pilot when retracted, the noise and vibration caused by its rotation after retraction can sometimes distract the pilot during takeoff. Summary of the Invention

[0003] The purpose of this invention is to provide a retractable braking device for aircraft nose wheels. This invention ensures that the nose wheels can be quickly brought to a stop after being retracted from the ground, and the braking device needs to be simple, reliable, and easy to maintain.

[0004] Technical Solution. An aircraft nose wheel retractable brake device includes a friction speed reducer mounting base, the upper surface of the friction speed reducer mounting base being hinged to the lower end of a spring rod, the upper end of the spring rod being hinged to a spring rod connecting support fixed to the aircraft; the lower end of the friction speed reducer mounting base being hinged to a friction speed reducer connecting support fixed to the aircraft; and a friction speed reducer being fixed to the lower surface of the friction speed reducer mounting base.

[0005] In the aforementioned aircraft nose wheel retraction brake device, the spring rod includes a rod end cap, a spring, and a sleeve. The rod body on the upper side of the rod end cap extends into the lower side of the sleeve and is slidably connected to the sleeve. A spring is sleeved between the rod end cap and the sleeve. The lower side of the rod end cap is hinged to the waist of the upper surface of the friction speed reduction plate mounting base, and the upper side of the sleeve is hinged to the spring rod connecting support.

[0006] In the aforementioned aircraft nose wheel retraction brake device, the upper side of the sleeve is threadedly connected to the ear bolt, and the ear bolt is hinged to the spring rod connecting support.

[0007] In the aforementioned aircraft nose wheel retraction brake device, the lug bolt is threaded with a tightening nut.

[0008] In the aforementioned aircraft nose wheel retraction brake device, a bushing is provided at the part where the sleeve and the rod end cap are slidably connected; the rod end cap extends out of the bushing and is connected to the limit nut.

[0009] In the aforementioned aircraft nose wheel retraction brake device, the friction speed reduction plate is fixed to the lower surface of the friction speed reduction plate mounting base by fixing bolts.

[0010] In the aforementioned aircraft nose wheel retraction brake device, the lower end of the friction speed reduction plate mounting base is hinged to the friction speed reduction plate connecting support via connecting shaft A.

[0011] In the aforementioned aircraft nose wheel retraction brake device, the upper end of the spring rod is hinged to the spring rod connecting support fixed on the aircraft via the connecting shaft B.

[0012] In the aforementioned aircraft nose wheel retraction brake device, the upper surface of the friction deceleration plate mounting base is hinged to the lower end of the spring rod via a connecting shaft C.

[0013] Beneficial effects: The aircraft nose wheel retraction brake device of the present invention utilizes the retracted landing gear as a power source during the retraction process. The tire gradually presses against the friction reduction plate of the brake device, and the friction between the friction reduction plate and the tire rapidly decelerates the nose wheel, bringing it to a stop in a short time. Furthermore, the present invention allows for adjustment of the spring rod length to maintain sufficient friction between the tire and the reduction plate. The overall structure is lightweight, easy to maintain, and structurally sound and reliable. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the aircraft front wheel retracting brake device of the present invention;

[0015] Figure 2 This is a schematic diagram of a spring rod structure. Detailed Implementation

[0016] Example 1. An aircraft nose wheel retractable brake device, see [link to example]. Figures 1-2 It includes a friction speed reducer mounting base 5, the upper surface of the friction speed reducer mounting base 5 is hinged to the lower end of the spring rod 6, the upper end of the spring rod 6 is hinged to the spring rod connecting support 8 fixed on the aircraft; the lower end of the friction speed reducer mounting base 5 is hinged to the friction speed reducer connecting support 10 fixed on the aircraft; and a friction speed reducer 3 is fixed on the lower surface of the friction speed reducer mounting base 5.

[0017] The aforementioned spring rod 6 includes a rod end cap 11, a spring 12, and a sleeve 13. The rod body on the upper side of the rod end cap 11 extends into the lower side of the sleeve 13 and is slidably connected to the sleeve 13. The spring 12 is sleeved between the rod end cap 11 and the sleeve 13. The lower side of the rod end cap 11 is hinged to the waist of the upper surface of the friction deceleration plate mounting base 5, and the upper side of the sleeve 13 is hinged to the spring rod connecting support 8.

[0018] The upper side of the aforementioned sleeve 13 is threadedly connected to the earring bolt 15, and the earring bolt 15 is hinged to the spring rod connecting support 8.

[0019] The aforementioned earring bolt 15 is threaded with a tightening nut 14.

[0020] The aforementioned sleeve 13 is provided with a bushing 16 at the part where it is slidably connected to the rod body of the end cap 11 with the rod; the rod body of the end cap 11 extends out of the bushing 16 and is connected to the limiting nut 16.

[0021] The aforementioned friction speed reducer 3 is fixed to the lower surface of the friction speed reducer mounting base 5 by fixing bolts 4.

[0022] The lower end of the aforementioned friction speed reducer mounting base 5 is hinged to the friction speed reducer connecting support 10 via connecting shaft A1.

[0023] The upper end of the aforementioned spring rod 6 is hinged to the spring rod connecting support 8 fixed on the aircraft via the connecting shaft B7.

[0024] The upper surface of the aforementioned friction speed reducer mounting base 5 is hinged to the lower end of the spring rod 6 via the connecting shaft C9.

[0025] When the landing gear is retracted, after the tire 2 is retracted, the tire 2 comes into contact with the friction speed reducer 3, and the friction speed reducer 3 and the friction speed reducer mounting base 5 rotate around the connection point of the friction speed reducer connecting support 8.

[0026] When the spring rod 6 is subjected to the force of the tire, the friction deceleration plate mounting base 5 compresses the spring rod 6, and the spring rod 6 internally compresses the spring 12 with the rod end cap 11. The rod end cap 11 extends into the cavity inside the sleeve 13. Under the action of the spring 12 of the spring rod 6, the friction deceleration plate 3 adheres tightly to the tire 2, generating a frictional deceleration effect.

[0027] The ear bolt 15 in the spring rod 6 can be used to adjust the length of the spring rod to ensure the adhesion between the friction deceleration plate 3 and the tire 2.

Claims

1. An aircraft nose wheel retractable brake device, characterized in that, The system includes a friction speed reducer mounting base (5), the upper surface of which is hinged to the lower end of a spring rod (6), the upper end of which is hinged to a spring rod connecting support (8) fixed on the aircraft; the lower end of which is hinged to a friction speed reducer connecting support (10) fixed on the aircraft; a friction speed reducer (3) is fixed on the lower surface of the friction speed reducer mounting base (5); the spring rod (6) includes a rod end cap (11), a spring (12), and a sleeve (13), the rod body on the upper side of the rod end cap (11) extends into the lower side of the sleeve (13) and is slidably connected to the sleeve (13). A spring (12) is fitted between the rod end cap (11) and the sleeve (13); the lower side of the rod end cap (11) is hinged to the waist of the upper surface of the friction deceleration plate mounting base (5), and the upper side of the sleeve (13) is hinged to the spring rod connecting support (8); the upper side of the sleeve (13) is threadedly connected to the ear bolt (15), and the ear bolt (15) is hinged to the spring rod connecting support (8); a tightening nut (14) is threadedly connected to the ear bolt (15); a bushing (16) is provided at the part where the sleeve (13) and the rod body of the rod end cap (11) slide to connect; the rod body of the rod end cap (11) extends out of the bushing (16) and is connected to the limiting nut.

2. The aircraft nose wheel retractable brake device according to claim 1, characterized in that, The friction speed reduction plate (3) is fixed to the lower surface of the friction speed reduction plate mounting base (5) by fixing bolts (4).

3. The aircraft nose wheel retractable brake device according to claim 1, characterized in that, The lower end of the friction speed reducer mounting base (5) is hinged to the friction speed reducer connecting support (10) via the connecting shaft A (1).

4. The aircraft nose wheel retractable brake device according to claim 1, characterized in that, The upper end of the spring rod (6) is hinged to the spring rod connecting support (8) fixed on the aircraft via the connecting shaft B (7).

5. The aircraft nose wheel retractable brake device according to claim 1, characterized in that, The upper surface of the friction deceleration plate mounting base (5) is hinged to the lower end of the spring rod (6) via the connecting shaft C (9).

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