Aircraft tire inflation device

Abstract

The invention discloses an aircraft tire inflating device, which belongs to the technical field of aviation equipment repair and comprises a nut, a rotating rod, a mandrel, a mandrel outer cylinder and a screwed joint, the rear end of the mandrel is connected with the screwed joint, the rear end of the screwed joint is hermetically connected with an air path, the mandrel outer cylinder is sleeved outside the mandrel, the rear end of the mandrel outer cylinder is in threaded fit with the nut, and the nut is sleeved outside the screwed joint. The nut is screwed to push the screwed joint to move forwards, the mandrel outer cylinder is sleeved with the rotating rod, and the front end of the rotating rod is installed at the threaded end of a certain machine and sealed. During use, after the rotating rod is hermetically connected with a threaded end of a machine and the screwed joint is hermetically connected with an air path, the nut is rotated to push the screwed joint to drive the mandrel to eject the one-way self-locking valve open for air inflation. The aircraft tire is simple and practical in structure, the inflation efficiency after the aircraft tire is disassembled can be improved, the scrap probability of accessories at threads of a certain aircraft tire is reduced, and then the whole combat readiness period is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation equipment repair and involves an aircraft tire inflation device. Background Art

[0002] A certain type of aircraft has 3 tires. To prevent air leakage, each tire is equipped with a one-way self-locking valve. That is, when inflating, while opening the one-way self-locking valve, it is necessary to ensure the seal between the inflation end and the connection ends on both sides of the aircraft, and the main body interface cannot rotate (when the thread rotates, the mandrel has been inserted into the one-way self-locking valve to avoid damaging the accessories), and a thread tightening sealing device is required. The existing technology adopts an inflation method that requires multiple people to cooperate with the same force, that is, one person holds and fixes the interface of a certain type of aircraft, and another person operates the inflation at the inflation end. Due to the lack of a special tire inflation device, and there is a certain degree of instability (during the operation process, personnel cannot leave midway) and insecurity, it is easy to cause waste of gas resources and damage to interface accessories, thereby affecting the repair of the overall accessories of the mechanical system and the overall maintenance cycle of the thermal guarantee. Summary of the Invention

[0003] According to the external thread characteristics and usage requirements of a certain aircraft, the present invention provides an aircraft tire inflation device, which is a special inflation device with an interface type 360-degree self-rotating thread connection, that is, after inserting into the tire one-way self-locking valve, it performs non-moving inflation when facing the opening. The structure of the present invention is simple, safe to use, and convenient to operate. It is the best choice for inflating this special tire. Moreover, due to the universality of the relevant tire external thread (8V1 airtight core thread), this device can be promoted for inflating tires of the same model in automobiles, ships, etc.

[0004] The present invention adopts the following technical solutions:

[0005] An aircraft tire inflation device, the inflation device includes a nut 1, a rotating rod 2, a mandrel 3, an outer cylinder of the mandrel 4, a threaded joint 5, an O-ring 6, a hole retaining wire snap ring 7, a slotted flat-end set screw 8, and a round steel ball 9.

[0006] The main body of the mandrel 3 is a hollow tubular structure, and a large-diameter mounting head is provided on the outer wall of its tail end. The mounting head is provided with an external thread for assembling with the threaded joint 5. An annular boss is formed on the outer wall of the mandrel 3 near the mounting head position for restricting the position of the threaded joint 5.

[0007] The threaded joint 5 is a columnar structure with a through hole in the center. The rear end is a joint with an external thread for connecting the gas path. The end of the joint is provided with a threaded cone surface for end-face sealing with the gas path. The outer wall of the front part of the joint is flattened for cooperating with tools such as wrenches to rotate the threaded joint 5. An annular boss is formed in the middle near the rear end for cooperating with the inner hole of the nut 1. Two annular grooves are formed in the middle of the threaded joint 5, and the O-ring 6 is installed in the annular grooves. The front end of the inner hole of the threaded joint 5 is provided with an internal thread for threaded connection with the mounting head of the mandrel 3.

[0008] The mandrel outer cylinder 4 is a three-stage stepped cylinder with an outer diameter increasing successively from the head to the tail. An annular groove is formed on the outer wall of the first stage, and the cross-section of the annular groove is arc-shaped. An external thread is formed on the third stage for threaded connection with the nut 1. The mandrel outer cylinder 4 is provided with a stepped inner hole. The first half of the inner hole is a small-diameter section, the inner diameter of which is in sliding fit with the outer diameter of the mandrel 3, and a groove is formed at its front end for exposing the head of the mandrel 3. The second half of the inner hole is a large-diameter section, the inner diameter of which is in sliding fit with the outer diameter of the small-diameter section of the threaded joint 5, and the two are sealed by an O-ring 6.

[0009] The nut 1 is provided with an internal thread for threaded cooperation with the third stage of the mandrel outer cylinder 4. The length of the nut 1 is greater than the length of the third stage on the mandrel outer cylinder 4, so that there is a certain space between the rear end of the mandrel outer cylinder 4 and the rear end of the inner hole of the nut 1. The annular boss of the threaded joint 5 is located in this space and is in sliding fit with the inner hole of the nut 1. An annular groove is formed at the rear end of the inner hole of the nut 1, and a circlip 7 for holes is installed in the annular groove to block the hole opening, so as to realize the free rotation of the nut 1 without falling off.

[0010] The inner hole of the rotating rod 2 is a three-stage stepped hole with an inner diameter increasing successively from the head to the tail. The inner diameter of the third stage of the inner hole is in fit with the outer diameter of the second stage of the mandrel outer cylinder 4, and the inner diameter of the second stage of the inner hole is in fit with the outer diameter of the first stage of the mandrel outer cylinder 4. An annular groove is formed in the second stage of the inner hole, and the cross-section of the annular groove is arc-shaped. The rotating rod 2 is sleeved from the head of the mandrel outer cylinder 4, and its annular groove cooperates with the annular groove on the mandrel outer cylinder 4 to form an annular groove with a circular cross-section. A number of round steel balls 9 arranged closely are installed in the annular groove for two-way limit, so that the rotating rod 2 can rotate freely without falling off. Through holes are formed on the outer wall of the rotating rod 2 corresponding to the position of the annular groove for installing slotted fillister head screws 8 to seal the round steel balls 9. An internal thread is formed in the first stage of the inner hole of the rotating rod 2 for installation on the threaded end of a certain machine and sealing.

[0011] The using process is as follows: Rotate the rotating rod 2 to install its head on the threaded end of a certain machine to achieve sealing, connect the threaded joint 5 with the air circuit and seal it; Keep the rotating rod 2 stationary, turn the nut 1 to make it move forward. The nut 1 pushes the threaded joint 5 to move forward, and the threaded joint 5 further pushes the mandrel 3 to move forward to push open a certain machine one-way self-locking valve, thus forming an integrated inflation device.

[0012] The beneficial effects of the present invention: The structure of the present invention is simple and practical, which can improve the inflation efficiency after the disassembly of the aircraft tire, reduce the scrap probability of the accessories at the threaded part of a certain machine tire, and thus shorten the overall combat readiness cycle. Brief Description of the Drawings

[0013] Figure 1 It is the front view of the overall structure of the present invention.

[0014] Figure 2 It is the schematic diagram of the nut structure.

[0015] Figure 3 Schematic diagram of the rotating rod structure, where (a) is the front view and (b) is the top view.

[0016] Figure 4 Schematic diagram of the mandrel structure, where (a) is the front view, (b) is the side view, and (c) is the top view.

[0017] Figure 5 Schematic diagram of the outer cylinder of the mandrel.

[0018] Figure 6 Schematic diagram of the threaded joint structure, where (a) is the front view, (b) is the sectional view taken along A - A, and (c) is the top view.

[0019] Among them, 1 - nut, 2 - rotating rod, 3 - mandrel, 4 - outer cylinder of the mandrel, 5 - threaded joint, 6 - O - ring 6, 7 - wire snap ring for hole, 8 - slotted flat - end set screw, 9 - round steel ball. Specific implementation manner

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following will describe in detail the specific implementation manners of the present invention with reference to the technical solutions.

[0021] An aircraft tire inflation device, the inflation device includes a nut 1, a rotating rod 2, a mandrel 3, an outer cylinder of the mandrel 4, a threaded joint 5, an O - ring 6, a wire snap ring for hole 7, a slotted flat - end set screw 8, and a round steel ball 9, as Figure 1 .

[0022] As Figure 4 , the main body of the mandrel 3 is a hollow tubular structure, and a large - diameter mounting head is provided on the outer wall of its tail end. The mounting head is provided with an external thread for assembling with the threaded joint 5. An annular boss is formed on the outer wall of the mandrel 3 near the mounting head for restricting the position of the threaded joint 5.

[0023] As Figure 6 , the threaded joint 5 is a columnar structure with a through - hole in the center. The rear end is a joint with an external thread for connecting the gas path. The end of the joint is provided with a threaded taper surface for end - face sealing with the gas path. The outer wall of the front part of the joint is flattened for cooperating with tools such as wrenches to twist the threaded joint 5. An annular boss is formed in the middle near the rear end for cooperating with the inner hole of the nut 1. Two annular grooves are formed in the middle of the threaded joint 5, and the O - ring 6 is installed in the annular grooves. The front end of the inner hole of the threaded joint 5 is provided with an internal thread for threaded connection with the mounting head of the mandrel 3.

[0024] As Figure 5, the mandrel outer cylinder 4 is a three-stage stepped cylinder, and its outer diameter increases sequentially from the head to the tail. An annular groove is formed on the outer wall of the first stage, and the cross-section of the annular groove is arc-shaped. An external thread is formed on the third stage for threaded connection with the nut 1; the mandrel outer cylinder 4 is provided with a stepped inner hole. The first half of the inner hole is a small-diameter section, and its inner diameter is in sliding fit with the outer diameter of the mandrel 3. A groove is formed at its front end for exposing the head of the mandrel 3. The second half of the inner hole is a large-diameter section, and its inner diameter is in sliding fit with the outer diameter of the small-diameter section of the threaded joint 5. The two are sealed by an O-ring 6.

[0025] As Figure 2 , the nut 1 is provided with an internal thread for threaded cooperation with the third stage of the mandrel outer cylinder 4. The length of the nut 1 is greater than the length of the third stage on the mandrel outer cylinder 4, so that there is a certain space between the rear end of the mandrel outer cylinder 4 and the rear end of the inner hole of the nut 1. The annular boss of the threaded joint 5 is located in this space and is in sliding fit with the inner hole of the nut 1. An annular groove is formed at the rear end of the inner hole of the nut 1, and a hole retaining wire ring 7 is installed in the annular groove for orifice blocking to realize the free rotation of the nut 1 without falling off.

[0026] As Figure 3 , the inner hole of the rotating rod 2 is a three-stage stepped hole, and its inner diameter increases sequentially from the head to the tail. The inner diameter of the third stage of the inner hole is matched with the outer diameter of the second stage of the mandrel outer cylinder 4, and the inner diameter of the second stage of the inner hole is matched with the outer diameter of the first stage of the mandrel outer cylinder 4. An annular groove is formed in the second stage of the inner hole, and the cross-section of the annular groove is arc-shaped. The rotating rod 2 is sleeved from the head of the mandrel outer cylinder 4, and its annular groove cooperates with the annular groove on the mandrel outer cylinder 4 to form an annular groove with a circular cross-section. A number of round steel balls 9 arranged closely are loaded into the annular groove for two-way limit, so that the rotating rod 2 can rotate freely without falling off. Through holes are formed in the outer wall of the rotating rod 2 corresponding to the position of the annular groove for installing slotted fillister head screws 8 to seal the round steel balls 9. An internal thread is formed in the first stage of the inner hole of the rotating rod 2 for installation at the threaded end of a certain machine and sealing.

[0027] The usage process is as follows: Rotate the rotating rod 2 to install its head at the threaded end of a certain machine for sealing, connect the threaded joint 5 with the gas circuit and seal it; keep the rotating rod 2 stationary, turn the nut 1 to make it move forward, the nut 1 pushes the threaded joint 5 to move forward, and the threaded joint 5 further pushes the mandrel 3 to move forward to push open a certain machine one-way self-locking valve, thereby forming an integrated inflation device.

[0028] In summary, the above is only a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aircraft tire inflation device, characterized in that, The described inflation device includes a nut (1), a screw rod (2), a mandrel (3), an outer cylinder of the mandrel (4), and a threaded joint (5); The tail end of the mandrel (3) is provided with a mounting head with external threads, which is assembled with the threaded joint (5); The rear end of the threaded joint (5) is a joint for sealing and connecting the gas circuit. A ring-shaped boss is made in the middle near the rear end. The front end of the inner hole of the threaded joint (5) is made with internal threads for threaded connection with the mounting head of the mandrel (3); The outer cylinder of the mandrel (4) is a three-stage stepped cylinder, and the outer diameter increases sequentially from the head to the tail. The third stage is made with external threads for threaded connection with the nut (1). The outer cylinder of the mandrel (4) is made with a stepped inner hole. The first half of the inner hole is a small-diameter section, and its inner diameter is in sliding fit with the outer diameter of the mandrel (3). The second half of the inner hole is a large-diameter section, and its inner diameter is in sliding fit and sealed with the outer diameter of the small-diameter section of the threaded joint (5); The nut (1) is made with internal threads for threaded cooperation with the third stage of the outer cylinder of the mandrel (4). The length of the nut (1) is greater than the length of the third stage on the outer cylinder of the mandrel (4), so that there is a certain space between the rear end of the outer cylinder of the mandrel (4) and the rear end of the inner hole of the nut (1). The ring-shaped boss of the threaded joint (5) is located in this space and is in sliding fit with the inner hole of the nut (1); The inner hole of the screw rod (2) is a three-stage stepped hole, and the inner diameter increases sequentially from the head to the tail. The inner diameter of the third stage of the inner hole is in fit with the outer diameter of the second stage of the outer cylinder of the mandrel (4). The inner diameter of the second stage of the inner hole is in fit and limit with the outer diameter of the first stage of the outer cylinder of the mandrel (4). The first stage of the inner hole of the screw rod (2) is made with internal threads for installation at the threaded end of a certain machine and sealing.

2. The aircraft tire inflation device according to claim 1, wherein, The joint end of the threaded joint (5) is made with a threaded cone surface for end face sealing with the gas circuit.

3. The aircraft tire inflation device according to claim 1, wherein, A ring-shaped groove is made in the middle of the threaded joint (5), and an O-ring (6) is installed in the ring-shaped groove for sealing with the inner hole of the outer cylinder of the mandrel (4).

4. The aircraft tire inflation device according to claim 1, characterized in that, A ring-shaped groove is made on the outer wall of the first stage of the outer cylinder of the mandrel (4), and a ring-shaped groove is made in the second stage of the inner hole of the screw rod (2). The two ring-shaped grooves cooperate to form a ring-shaped groove. A number of closely arranged round steel balls (9) are loaded into the ring-shaped groove for two-way limit. A through hole is made on the outer wall of the screw rod (2) corresponding to the position of the ring-shaped groove for installing a slotted flat-end set screw (8) to seal the round steel balls (9).

5. The aircraft tire inflation device according to claim 1, characterized in that, A ring-shaped groove is made at the rear end of the inner hole of the nut (1), and a hole retaining wire ring (7) is installed in the ring-shaped groove for orifice blocking.

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