A main landing gear light wheel fork structure of integrated design

Abstract

The application relates to a main landing gear light wheel fork structure with an integrated design and belongs to the technical field of airplane design. The wheel fork structure comprises an upper locking bolt, a wheel fork main body, a brake key bolt, a tether ring, a lower guide pipe support, a brake disc, a brake guide pipe, an upper guide pipe support, an oil injection nozzle and a torsion arm connecting structure. The upper locking bolt is connected to the wheel fork main body, the upper locking function of the landing gear is realized, the brake key bolt is arranged in a hole formed at the intersection of lower inclined ribs, the brake disc is connected to the brake key bolt, the brake function of the main landing gear is realized, the tether ring is arranged in a hole formed in the brake key bolt, the tether function of the airplane is realized, the brake guide pipe is fixed to the wheel fork main body through the lower guide pipe support and is fixed to the torsion arm connecting structure through the upper guide pipe support, and the torsion arm connecting structure is connected to the wheel fork main body through a bolt.

Description

TECHNICAL FIELD

[0001] The application relates to a main landing gear light wheel fork structure designed in an integrated mode and belongs to the technical field of airplane design. BACKGROUND

[0002] The wheel fork on a main landing gear of an airplane is an important structure for transmitting ground load, the upper part is connected with a torsion arm and a piston rod for transmitting torsional load and other load respectively, and the lower part is connected with a wheel shaft and a brake device. Common wheel forks are in the structure of a circular tube type or an I-beam section, the circular tube type is beneficial to load bearing but difficult to process internally, and the I-beam section type is heavy in weight and needs to be considered for design of a wheel fork which is feasible in processing and light in weight. In the design of the wheel fork structure of the landing gear, in addition to the transmission of load as a main load-bearing structure, the weight is minimized as much as possible, pipeline arrangement, material cost and maintenance convenience are also considered, and various requirements are designed in an integrated mode to achieve the above purpose. SUMMARY

[0003] The application aims to design a main landing gear light wheel fork structure which is good in force transmission, light in structure, good in maintenance and multifunctional.

[0004] In order to achieve the above purpose, the application adopts the following technical scheme:

[0005] The application relates to a main landing gear light wheel fork structure designed in an integrated mode, which comprises an upper locking bolt, a wheel fork main body, a brake key bolt, a tether ring, a lower guide pipe support, a brake disc, a brake guide pipe, an upper guide pipe support, an oil filler neck and a torsion arm connecting structure.

[0006] The upper locking bolt is connected with the wheel fork main body to realize the locking function of the landing gear, the brake key bolt is arranged in a hole formed at the intersection of lower inclined ribs, the brake disc is connected with the brake key bolt to realize the brake function of the main landing gear, and the tether ring is arranged in a hole formed in the brake key bolt to realize the tether function of the airplane.

[0007] The brake guide pipe is fixed to the wheel fork main body through the lower guide pipe support and fixed to the torsion arm connecting structure through the upper guide pipe support, and the torsion arm connecting structure is connected with the wheel fork main body through bolts.

[0008] Further, the oil filler neck is used for oil injection of the oil cavity of the piston rod.

[0009] Further, the brake guide pipe comprises normal brake and emergency brake pipelines, the upper part is fixed to the upper guide pipe support, the upper guide pipe support is an extension structure of the torsion arm connecting piece and is connected with the wheel fork main body through screws, and the lower part is fixed to the lower guide pipe support and fastened to the wheel shaft bolt through a hole.

[0010] Further, one end of the bolt of the piston rod is used as an oil inlet, connected with an oil nozzle, and the oiling function is realized at the joint of the wheel fork and the piston rod, which is convenient to operate. The other end of the bolt of the piston rod is connected with an upper lock support, which is fastened by a stop pin, a stop nut and a screw. Since the support is far away from the main shaft of the landing gear, the load of the upper lock is reduced.

[0011] Further, the wheel fork body is designed with a tether ring, and the torsion arm connecting structure is separated from the wheel fork body and connected by a screw and a piston rod bolt.

[0012] Further, the brake disc is fixed on the brake key bolt, and the rotation around the wheel shaft is limited during braking.

[0013] Further, the brake key bolt is fixed on the wheel fork body through a perforation.

[0014] Further, the side edge of the lower guide pipe support is bent by 90° and closely contacts the wheel fork body to prevent twisting.

[0015] The wheel fork body is integrally formed by forging, and a split cross-section concave beam structure is designed for convenient machining. A cross diagonal rib is used for support in the middle, and the outer edge of the side is partially thickened. This structure effectively realizes the transmission of bending moment and torque. The lower part and the upper part of the wheel fork are connected with the wheel shaft and the piston rod by the lap joint circular hole and the bolt fixing mode respectively, so that the assembly and disassembly are convenient and the connection is reliable. The torsion arm connecting structure is fixed by the separated main structure and the bolt connection mode, which is convenient for disassembly and saves materials, and reduces the machining failure.

[0016] The present application provides a one-piece design of the main landing gear light wheel fork structure. From the structure, the wheel fork body adopts a cross diagonal rib support structure, which ensures the structural strength while reducing the weight, and realizes the light weight of the wheel fork. The strength of the bolt connection and the diagonal rib connection is ingeniously utilized to design structures with different functions, which is reasonable in design and reduces the number of parts. The connection with the torsion arm adopts a separate block and bolt fixing mode to save material processing cost, reduce machining failure and facilitate disassembly. From the function, the wheel fork structure design realizes the integration of multiple functions, meets the multiple needs of the landing gear in normal use, reduces the number of components of other functional structures, and reduces the weight of the entire landing gear system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The wheel fork structure assembly drawing of the present application;

[0018] Figure 2 The wheel fork-brake key integrated structure exploded view of the present application;

[0019] Figure 3 The wheel fork-oil nozzle-upper lock integrated structure exploded view of the present application;

[0020] Figure 4 The exploded view of the wheel fork-pipeline integrated structure of the present application;

[0021] Figure 5 The cross-sectional view of the main body structure of the present application;

[0022] In the figure: 1 - upper lock bolt, 2 - wheel fork main body, 3 - brake key bolt, 4 - tether ring, 5 - lower conduit support, 6 - brake disc, 7 - brake conduit, 8 - upper conduit support, 9 - oil filler, 10 - torsion arm connecting structure, 11 - nut, 12 - gasket, 13 - screw, 14 - upper lock support, 15 - stop pin, 16 - stop nut, 17 - piston rod bolt, 18 - wheel shaft bolt. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] The structure of the wheel fork main body from bottom to top fully utilizes bolted connections and strength surplus structures to sequentially consider conduit supports, tether rings, brake keys, upper lock supports, oil fillers, etc., and the integrated functional structure assembly drawing thereof is shown in Figure 1 .

[0025] 1 is the upper lock bolt, 2 is the wheel fork main body, 3 is the brake key bolt, 4 is the tether ring, 5 is the lower conduit support, 6 is the brake disc, 7 is the brake conduit, 8 is the upper conduit support, 9 is the oil filler, 10 is the torsion arm connecting structure, and details are shown in the attached Figure 1 .

[0026] The wheel fork main body 2 is connected with the upper lock bolt 1, the upper locking function of the landing gear is realized at this place, the brake key bolt 3 is designed with a hole at the intersection of the lower inclined rib, the brake disc 6 is connected to the brake key bolt 3, the main landing gear brake function is realized, the tether ring is designed with a hole below the brake key bolt 3, the start-stop machine tethering function is realized, the conduit 7 is fixed to the wheel fork main body 2 through the lower conduit support 5 below and is fixed to the torsion arm connecting structure 10 through the upper conduit support 8 above, the torsion arm connecting structure 10 is connected to the wheel fork main body 2 through a bolt, the pipeline integration design is realized, and the oil filler 9 realizes the function of oiling the piston rod oil cavity at this place.

[0027] The integrated design of the main landing gear light-duty wheel fork structure assembly drawing is shown in Figure 1 , the integrated design exploded view is shown in Figures 2 to 4 , and the cross-sectional view is shown in Figure 5The application is embodied as follows according to the integrated design of structure and function:

[0028] 1) Integrated design of wheel fork and pipe

[0029] The brake pipe 7 contains normal brake and emergency brake pipe, and is fixed at the upper pipe support 8, which is the structure of the torsion arm connecting member extending, and is connected to the wheel fork main body 2 through the screw 13 at the side, and is fixed at the lower pipe support 5, which is fastened through the hole in the wheel shaft bolt 18, and is bent 90° at the side to adhere to the wheel fork main body 2 to prevent twisting, and the integrated design of wheel fork and pipe is successfully realized through the selection of appropriate position and the comprehensive utilization of other connecting members.

[0030] 2) Integrated design of wheel fork and brake key

[0031] The brake disc 6 is fixed on the brake key bolt 3, which can limit the rotation around the wheel shaft during braking. Since the maximum brake torque is constant, the design increases the force arm of the brake key to the wheel spindle, so the load is greatly reduced, and the brake key bolt 3 can meet the requirements without being very strong. The brake key bolt 3 is fixed on the wheel fork main body 2 through the hole at the position with sufficient strength, and is matched in height, so the integrated design of the brake key on the wheel fork is fully realized.

[0032] 3) Integrated design of wheel fork, oil nozzle and upper lock

[0033] The two ends of the piston rod bolt 17 extend out, one end of which serves as an oil inlet and connects the oil nozzle 3 to realize the oil injection function at the joint of the wheel fork and the piston rod, and the other end connects the upper lock support 14, which is fastened by the stop pin 15 and the stop nut 16, and the screw 13. Since it is far away from the main shaft of the landing gear, the load of the upper lock is reduced, and the integrated design of the wheel fork, the oil nozzle and the upper lock is fully realized.

[0034] 4) Other designs

[0035] The wheel fork main body 2 below has a design of retaining ring and torsion arm connecting structure, which is separated from the wheel fork main body 2 and connected by the screw 13 and the piston rod bolt 17.

[0036] In all the schemes mentioned above, the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection or other known connection methods, which will not be described here. In the above, the preferred consideration is welding for the fixed connection, although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. An integrally designed main landing gear light wheel fork structure, characterized by: The wheel fork structure comprises an upper locking bolt (1), a wheel fork body (2), a brake key bolt (3), a tether ring (4), a lower guide pipe support (5), a brake disc (6), a brake guide pipe (7), an upper guide pipe support (8), an oil injection nozzle (9), and a torsion arm connecting structure (10); The wheel fork body (2) is connected with the upper locking bolt (1), so that the upper locking function of the landing gear is realized; the brake key bolt (3) is arranged in a hole formed at the intersection of the lower inclined ribs; the brake disc (6) is connected to the brake key bolt (3), so that the brake function of the main landing gear is realized; the brake key bolt (3) is provided with the tether ring (4) in a lower hole; The brake guide pipe (7) is fixed to the wheel fork body (2) through the lower guide pipe support (5) at the lower side and fixed to the torsion arm connecting structure (10) through the upper guide pipe support (8) at the upper side; the torsion arm connecting structure (10) is connected to the wheel fork body (2) through a bolt; The oil injection nozzle (9) is used for injecting oil into the oil cavity of the piston rod; The brake guide pipe (7) comprises normal brake and emergency brake pipelines; the upper part is fixed to the upper guide pipe support (8); the upper guide pipe support (8) is an extension structure of the torsion arm connecting structure; the lower part is fixed to the lower guide pipe support (5); the lower guide pipe support (5) is fastened to the wheel shaft bolt (18) through a hole; The piston rod bolt (17) is connected to the upper locking support (14) through a stop pin (15) and a stop nut (16); the piston rod bolt (17) is fastened to the wheel fork body (2) through a screw (13).

2. The integrally designed main landing gear light wheel fork structure according to claim 1, characterized in that: The wheel fork body (2) is provided with the tether ring (4); the torsion arm connecting structure (10) is separated from the wheel fork body (2) and connected to the wheel fork body (2) through the screw (13) and the piston rod bolt (17).

3. The integrally designed main landing gear light wheel fork structure according to claim 1, characterized in that: The brake disc (6) is fixed to the brake key bolt (3); the brake disc (6) can limit the rotation of the wheel shaft during braking.

4. The integrally designed main landing gear light wheel fork structure according to claim 1, characterized in that: The brake key bolt (3) is fixed to the wheel fork body (2) through a hole.

5. The integrally designed main landing gear light wheel fork structure according to claim 1, characterized in that: The lower guide pipe support (5) is bent by 90° at the side edge and closely contacts the wheel fork body (2) to prevent twisting.

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