An aircraft tire inflation device

Abstract

This utility model discloses an aircraft tire inflation device, belonging to the field of aviation equipment repair and maintenance technology. It includes a nut, a rotating rod, a mandrel, a mandrel outer cylinder, and a threaded connector. The rear end of the mandrel is connected to the threaded connector, and the rear end of the threaded connector is sealed to the air passage. The mandrel outer cylinder is fitted over the mandrel, and its rear end is threadedly engaged with the nut. The nut is fitted over the threaded connector. Tightening the nut pushes the threaded connector forward. The rotating rod is fitted over the mandrel outer cylinder, and its front end is installed on and sealed at the threaded end of an aircraft. In use, after the rotating rod is sealed to the threaded end of the aircraft and the threaded connector is sealed to the air passage, rotating the nut pushes the threaded connector, causing the mandrel to open the one-way self-locking valve for inflation. This utility model has a simple and practical structure, which can improve the inflation efficiency of disassembled aircraft tires, reduce the scrap rate of accessories at the threaded end of the aircraft tire, and thus shorten the overall operational readiness cycle.

Description

Technical Field

[0001] This utility model belongs to the field of aviation equipment repair and maintenance technology, and relates to an aircraft tire inflation device. Background Technology

[0002] A certain type of aircraft has three tires. To prevent air leakage, each tire has a one-way self-locking valve. This means that during inflation, the one-way self-locking valve must be opened while ensuring a seal between the inflation end and the connecting ends on both sides of the aircraft. The main interface must not be rotated (the mandrel is inserted into the one-way self-locking valve during threaded rotation to avoid damage to accessories), and the thread must be tightened to seal the device. Current technology employs a multi-person, collaborative inflation method: one person holds the aircraft interface in place while another person performs the inflation operation. Due to the lack of a dedicated tire inflation device and inherent instability (personnel cannot leave the site during operation) and safety concerns, this method easily leads to wasted gas resources, damage to interface accessories, and consequently, affects the repair of the entire mechanical system and the overall maintenance cycle of the thermal support system. Utility Model Content

[0003] Based on the characteristics of the external thread of a certain aircraft and its usage requirements, this utility model provides an aircraft tire inflation device. It is a dedicated inflation device with a 360-degree self-rotating threaded connection, allowing for inflation by inserting the tire's one-way self-locking valve and maintaining a stationary connection. This utility model features a simple structure, safe use, and convenient operation, making it the optimal choice for inflating this specific type of tire. Furthermore, due to the universality of the relevant tire external thread (8V1 airtight core thread), this device can be extended to inflate tires of the same model used in automobiles, ships, and other similar applications.

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

[0005] An aircraft tire inflation device, comprising a nut 1, a rotating rod 2, a mandrel 3, a mandrel outer cylinder 4, a threaded connector 5, an O-ring 6, a wire retaining ring for the hole 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 its tail end outer wall is provided with a large-diameter mounting head. The mounting head has external threads for assembly with the threaded connector 5. The outer wall of the mandrel 3 near the mounting head is provided with an annular boss to limit the position of the threaded connector 5.

[0007] The threaded connector 5 is a columnar structure with a through hole in the center and an external thread at the rear end for connecting to the air passage. The end of the connector has a threaded conical surface for end-face sealing with the air passage. The outer wall of the front part of the connector is flattened for tightening the threaded connector 5 with tools such as wrenches. An annular boss is formed in the middle near the rear end for mating with the inner hole of the nut 1. Two annular grooves are formed in the middle of the threaded connector 5, and O-rings 6 are installed in the annular grooves. The front end of the inner hole of the threaded connector 5 has an internal thread for threaded connection with the mounting head of the mandrel 3.

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

[0009] The nut 1 has an internal thread for engaging with the third section of the thread on the outer cylinder 4 of the mandrel. The length of the nut 1 is greater than the length of the third section on the outer cylinder 4 of the mandrel, so that there is a certain space between the rear end of the outer cylinder 4 of the mandrel 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 the annular boss slides with the inner hole of the nut 1. The rear end of the inner hole of the nut 1 has an annular groove. The mounting hole in the annular groove is blocked by a wire retainer 7 to allow the nut 1 to rotate freely without falling off.

[0010] The inner hole of the rotating rod 2 is a three-stage stepped hole, with the inner diameter increasing sequentially from the head to the tail. The inner diameter of the third stage of the inner hole matches 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 matches the outer diameter of the first stage of the mandrel outer cylinder 4. The second stage of the inner hole has an annular groove with an arc-shaped cross-section. The rotating rod 2 is inserted from the head of the mandrel outer cylinder 4, and its annular groove matches the annular groove on the mandrel outer cylinder 4 to form an annular groove with a circular cross-section. Several closely arranged round steel balls 9 are inserted into the annular groove for bidirectional limiting, so that the rotating rod 2 can rotate freely but will not fall off. A through hole is made on the outer wall of the rotating rod 2 corresponding to the position of the annular groove, which is used to install a slotted flat-end set screw 8 to seal the round steel balls 9. The first stage of the inner hole of the rotating rod 2 has an internal thread, which is used to install on the threaded end of a certain machine and seal it.

[0011] The process of use is as follows: Rotate the rotating rod 2 so that its head is installed on the threaded end of a certain machine to achieve a seal, connect the threaded connector 5 to the air circuit and seal it; keep the rotating rod 2 still, turn the nut 1 to move it forward, the nut 1 pushes the threaded connector 5 forward, the threaded connector 5 then pushes the spindle 3 forward to open the one-way self-locking valve of a certain machine, thus forming an integrated air inflation device.

[0012] The beneficial effects of this utility model are: This utility model has a simple and practical structure, which can improve the inflation efficiency of aircraft tires after disassembly, reduce the scrap rate of accessories at the threaded parts of a certain aircraft tire, and thus shorten the overall combat readiness cycle. Attached Figure Description

[0013] Figure 1 This is a front view of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of a nut structure.

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

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

[0017] Figure 5 This is a schematic diagram of the mandrel outer cylinder structure.

[0018] Figure 6 The diagram shows the structure of a threaded connector, where (a) is the front view, (b) is the AA section view, and (c) is the top view.

[0019] Among them, 1-nut, 2-rotor, 3-spindle, 4-spindle outer cylinder, 5-threaded joint, 6-O-ring, 7-wire retaining ring for hole, 8-slotted flat-end set screw, 9-round steel ball. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below.

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

[0022] like Figure 4 The main body of the mandrel 3 is a hollow tubular structure, and its tail end outer wall is provided with a large-diameter mounting head. The mounting head has external threads for assembly with the threaded joint 5. The outer wall of the mandrel 3 near the mounting head is provided with an annular boss for limiting the position of the threaded joint 5.

[0023] like Figure 6 The threaded connector 5 is a columnar structure with a through hole in the center and an external thread at the rear end for connecting to the air passage. The end of the connector has a threaded conical surface for end-face sealing with the air passage. The outer wall of the front part of the connector is flattened for tightening the threaded connector 5 with tools such as wrenches. An annular boss is formed in the middle near the rear end for mating with the inner hole of the nut 1. Two annular grooves are formed in the middle of the threaded connector 5, and O-rings 6 are installed in the annular grooves. The front end of the inner hole of the threaded connector 5 has an internal thread for threaded connection with the mounting head of the mandrel 3.

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

[0025] like Figure 2 The nut 1 has an internal thread for engaging with the third section of the thread on the outer cylinder 4 of the mandrel. The length of the nut 1 is greater than the length of the third section on the outer cylinder 4 of the mandrel, so that there is a certain space between the rear end of the outer cylinder 4 of the mandrel 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 the annular boss slides with the inner hole of the nut 1. The rear end of the inner hole of the nut 1 has an annular groove. The mounting hole in the annular groove is blocked by a wire retainer 7 to allow the nut 1 to rotate freely without falling off.

[0026] like Figure 3 The inner hole of the rotating rod 2 is a three-stage stepped hole, with the inner diameter increasing from the head to the tail. The inner diameter of the third stage of the inner hole matches 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 matches the outer diameter of the first stage of the mandrel outer cylinder 4. The second stage of the inner hole has an annular groove with an arc-shaped cross-section. The rotating rod 2 is inserted from the head of the mandrel outer cylinder 4, and its annular groove matches the annular groove on the mandrel outer cylinder 4 to form an annular groove with a circular cross-section. Several closely arranged round steel balls 9 are inserted into the annular groove for bidirectional limiting, so that the rotating rod 2 can rotate freely but will not fall off. A through hole is made on the outer wall of the rotating rod 2 corresponding to the position of the annular groove, which is used to install a slotted flat-end set screw 8 to seal the round steel balls 9. The first stage of the inner hole of the rotating rod 2 has an internal thread, which is used to install on the threaded end of a certain machine and seal it.

[0027] The process of use is as follows: Rotate the rotating rod 2 so that its head is installed on the threaded end of a certain machine to achieve a seal, connect the threaded connector 5 to the air circuit and seal it; keep the rotating rod 2 still, turn the nut 1 to move it forward, the nut 1 pushes the threaded connector 5 forward, the threaded connector 5 then pushes the spindle 3 forward to open the one-way self-locking valve of a certain machine, thus forming an integrated air inflation device.

[0028] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An aircraft tire inflation device, characterized in that, The inflation device includes a nut (1), a swivel rod (2), a mandrel (3), a mandrel outer cylinder (4), and a threaded connector (5); The mandrel (3) is provided with an external threaded mounting head at its tail end, which is assembled with the threaded connector (5); The threaded connector (5) has a connector at the rear end for sealing and connecting the air passage. A ring-shaped boss is made in the middle near the rear end. The inner hole of the threaded connector (5) has an internal thread at the front end for threaded connection with the mounting head of the mandrel (3). The outer cylinder (4) of the mandrel is a three-section stepped cylinder with the outer diameter increasing from the head to the tail. The third section is threaded and threaded to the nut (1). The outer cylinder (4) of the mandrel is a stepped inner hole. The first half of the inner hole is a small diameter section, and its inner diameter slides with the outer diameter of the mandrel (3). The second half of the inner hole is a large diameter section, and its inner diameter slides with the outer diameter of the small diameter section of the threaded joint (5) and seals it. The nut (1) is threaded with internal threads for engaging with the third thread of the mandrel outer cylinder (4). The length of the nut (1) is greater than the length of the third section of 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 the annular boss slides with the inner hole of the nut (1). The inner hole of the rotating rod (2) is a three-stage stepped hole with the inner diameter increasing from the head to the tail. The inner diameter of the third stage of the inner hole matches the outer diameter of the second stage of the mandrel outer cylinder (4). The inner diameter of the second stage of the inner hole matches and limits the outer diameter of the first stage of the mandrel outer cylinder (4). The first stage of the inner hole of the rotating rod (2) is threaded internally for installation on the threaded end of a machine and for sealing.

2. The aircraft tire inflation device according to claim 1, characterized in that, The threaded connector (5) has a threaded tapered surface at the end of the connector to provide end-face sealing with the air passage.

3. The aircraft tire inflation device according to claim 1, characterized in that, The threaded connector (5) has an annular groove in the middle, and an O-ring (6) is installed in the annular groove to achieve a seal with the inner hole of the mandrel outer cylinder (4).

4. The aircraft tire inflation device according to claim 1, characterized in that, The outer wall of the first section of the mandrel outer cylinder (4) is made with an annular groove, and the inner hole of the swivel rod (2) is made with an annular groove. The two annular grooves are combined to form an annular groove. Several closely arranged round steel balls (9) are inserted into the annular groove for bidirectional positioning. The outer wall of the swivel rod (2) is made with a through hole corresponding to the position of the annular groove, which is used to install slotted flat-end set screws (8) to seal the round steel balls (9).

5. The aircraft tire inflation device according to claim 1, characterized in that, The nut (1) has an annular groove at the rear end of its inner hole, and a wire retaining ring (7) is used to block the hole opening in the annular groove.

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