A double lip seal ring installation tool for helicopter engines

Abstract

This utility model discloses a double-lip seal installation tool for helicopter engines, belonging to the technical field of aero-engine installation tools. The tool includes a screw with a nut at one end, two pressing blocks that slide with the screw, a nut that threads with the screw, and a radial expansion mechanism located between the two pressing blocks and threaded with the screw. The radial expansion mechanism consists of an adjusting cylinder, multiple wedge-shaped support blocks, and a spring. The outer circumferential wall of the adjusting cylinder has multiple guide grooves that slide with the inclined surfaces of the wedge-shaped support blocks. The wedge-shaped support blocks have rubber pads, and their side walls have protrusions that match the strip-shaped grooves in the guide grooves. This tool solves the problems of existing installation equipment where the middle section of the screw cannot be positioned in the shaft hole, the operation is difficult, and the seal ring is easily damaged. It has advantages such as high installation accuracy, simple operation, protection of components, and strong versatility, and can effectively improve the installation quality and efficiency of double-lip seals on both sides of the helicopter engine overspeed clutch.

Description

Technical Field

[0001] This utility model relates to the technical field of aircraft engine installation tools, specifically to a helicopter engine double lip seal installation tool. Background Technology

[0002] In the maintenance and installation of helicopter engines, the installation of double-lip seals on both sides of the engine overspeed clutch is particularly critical. The installation effect directly affects the sealing performance of the engine and plays a decisive role in the stable operation of the engine.

[0003] Currently, there are devices available for simultaneously installing double-lip seals on both sides of the overspeed clutch of a helicopter engine. These devices primarily consist of a screw and two pressing blocks mounted on the screw. Their working principle involves a nut that meshes with the screw pressing the pressing blocks away from the nut, thereby forcing the double-lip seals pre-installed on the pressing blocks into the sealing end of the shaft hole.

[0004] However, this existing installation equipment has significant drawbacks. Firstly, the middle section of the screw cannot be effectively supported and positioned within the shaft hole. In actual operation, due to the lack of this crucial support and positioning structure, operators must rely entirely on manual operation to adjust the axial position of the double-lip seal. This not only demands extremely high levels of skill and experience from the operator, but also makes it difficult to guarantee the precision of manual adjustment. Even slight deviations can easily cause uneven forces on the seal during installation, leading to structural damage and severely affecting its sealing performance.

[0005] On the other hand, the lack of support and positioning in the middle section of the screw increases the difficulty of operation. Operators need to spend a significant amount of time adjusting the position of the sealing ring during installation, which undoubtedly reduces installation efficiency and increases the risk of installation failure due to improper operation. Furthermore, prolonged manual, delicate operation can easily lead to operator fatigue, further affecting the installation quality. Utility Model Content

[0006] The purpose of this invention is to provide a double-lip seal installation tool for helicopter engines, addressing the problem that in existing technologies, the middle section of the screw in the double-lip seal installation equipment for the overspeed clutch of helicopter engines cannot be supported and positioned in the shaft hole, and that relying on manual adjustment of the seal's axial position easily damages the seal and increases the difficulty of operation.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A helicopter engine double lip seal installation tool includes a screw with a nut at one end, two extrusion blocks sleeved on the screw and slidingly engaged with the screw, and a nut threaded with the screw. The two extrusion blocks are arranged opposite each other. The tool also includes a radial expansion mechanism threaded with the screw, which is located between the two extrusion blocks.

[0008] Furthermore, the radial expansion mechanism includes an adjusting cylinder that is threadedly engaged with the screw, a plurality of wedge-shaped support blocks that are engaged with the adjusting cylinder, and a spring sleeved on the screw; the outer circumferential wall of the adjusting cylinder is provided with a plurality of guide grooves that are slidably engaged with the inclined surfaces of the wedge-shaped support blocks, the guide grooves are equally spaced along the axial direction of the adjusting cylinder, one end of the spring is connected to the extrusion block away from the nut and the free end acts on the ends of the plurality of wedge-shaped support blocks.

[0009] Furthermore, the number of wedge-shaped support blocks is set to three or six.

[0010] Furthermore, a rubber pad layer is provided on the wall surface of the wedge-shaped support block along the outward expansion direction.

[0011] Furthermore, each of the wedge-shaped support blocks has a protrusion on its sidewall, and the guide groove has a strip-shaped groove on its sidewall that matches the protrusion. The strip-shaped groove is parallel to the inclined surface of the wedge-shaped support block.

[0012] Furthermore, the extrusion block is generally disc-shaped, with protruding shafts at both ends having a reduced diameter.

[0013] The beneficial effects of this invention are: In terms of installation precision, the radial expansion and contraction mechanism achieves accurate positioning, avoiding eccentric pressure on the sealing ring, ensuring sealing performance, and guaranteeing stable engine operation. Operationally, it greatly reduces difficulty, simplifies the process, improves installation efficiency, and lowers labor costs. It provides excellent protection for equipment components; the rubber gasket layer prevents damage to the inner wall of the shaft hole and the sealing ring, extending service life and reducing maintenance costs. It is highly versatile, adjustable to accommodate different sized shaft holes without requiring replacement of the entire system, thus reducing operating costs.

[0014] Overall, this tool provides an efficient and reliable solution for installing double-lip seals on helicopter engines, with significant advantages in precision, operation, protection, and versatility. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal fit between the adjusting cylinder and the wedge-shaped support block in this utility model; Figure 3 This is a schematic diagram of the end face structure of the adjusting cylinder and the wedge-shaped support block in this utility model.

[0016] Among them, 1-screw; 2-extrusion block; 3-nut; 4-adjusting cylinder; 5-wedge support block; 6-spring; 7-guide groove; 8-protrusion; 9-strip groove. Detailed Implementation

[0017] The preferred embodiments of this utility model will be described below with reference to the accompanying drawings.

[0018] like Figures 1 to 3 As shown, the helicopter engine double lip seal installation tool mainly consists of a screw 1 with a nut at one end, two compression blocks 2, a nut 3, and a radial expansion mechanism.

[0019] The screw 1 is the core support component of the entire installation tool. The nut at one end serves as a limit and is used to axially position the extrusion block 2, which is far from the nut, during use.

[0020] Two extrusion blocks 2 are fitted onto the screw 1 and slide in engagement with it, arranged opposite each other. When installing the double-lip seal ring, the double-lip seal ring is pre-installed on the extrusion blocks 2. Through subsequent operations, the extrusion blocks 2 press the seal ring into the sealing end of the shaft hole. The extrusion block 2 is generally disc-shaped, with tapered protrusions at both ends. The diameter of one protrusion is slightly smaller than the inner diameter of the seal ring, used to hold the seal ring in place. The portion of the extrusion block 2 that expands outward relative to the protrusions serves to resist the seal ring.

[0021] Nut 3 is threadedly engaged with screw 1. When nut 3 is rotated, it moves axially along screw 1, thereby squeezing the extrusion block 2 away from the nut, causing the distance between the two extrusion blocks 2 to change, thus realizing the extrusion installation action of the sealing ring.

[0022] The radial expansion and contraction mechanism includes an adjusting cylinder 4, multiple wedge-shaped support blocks 5, and a spring 6. The adjusting cylinder 4 is threadedly engaged with the screw 1. When the adjusting cylinder 4 is rotated, it moves axially along the screw 1, facilitating the adjustment of the relative axial position of the wedge-shaped support blocks 5 to the screw 1. Multiple guide grooves 7 are formed on the outer circumferential wall of the adjusting cylinder 4, and these guide grooves 7 are evenly distributed along the circumference of the adjusting cylinder 4. The inclined surfaces of the wedge-shaped support blocks 5 slide in engagement with the guide grooves 7. The number of wedge-shaped support blocks 5 is set to three or six, which ensures uniform support force on the shaft hole in the radial direction and facilitates processing and operation. The spring 6 is sleeved on the screw 1, with one end connected to the compression block 2 away from the nut, and the free end acting on the ends of the multiple wedge-shaped support blocks 5. In the initial state, the spring 6 is in a naturally extended state.

[0023] Each wedge-shaped support block 5 has a hemispherical protrusion 8 on its side wall, and a strip-shaped groove 9 on the side wall of the guide groove 7 that matches the protrusion 8, with the strip-shaped groove 9 being parallel to the inclined surface of the wedge-shaped support block 5. This structural design prevents the wedge-shaped support block 5 from detaching from the guide groove 7.

[0024] A rubber pad is provided on the wall surface of the wedge-shaped support block 5 along the outward expansion direction. This rubber pad has a dual function. On the one hand, the rubber pad is soft and can increase the friction with the inner wall of the shaft hole, making the support of the wedge-shaped support block 5 in the shaft hole more stable and preventing it from easily displacing due to external forces. On the other hand, the rubber pad can effectively prevent the hard metal surface of the wedge-shaped support block 5 from causing scratches or other damage to the inner wall of the shaft hole, thus protecting the integrity of the inner wall of the shaft hole.

[0025] Place the entire tool in the shaft hole, and use a wrench or other tool to suppress the rotation of the nut at the end of the screw 1. Then rotate the nut 3, which presses against the pressing block 2 away from the nut. The two pressing blocks 2 move towards each other, smoothly and accurately pressing the double-lip seal ring pre-installed on the pressing blocks 2 into the sealing end of the shaft hole. During this operation, the spring presses the end of the wedge-shaped support block 5, causing the wedge-shaped support block 5 and the adjusting cylinder 4 to move relative to each other and expand outward until its outward expansion wall is in close contact with the inner wall of the shaft hole. Since the action of the wedge-shaped support block 5 pressing against the inner wall takes precedence over the two pressing blocks 2 pressing the seal ring into the shaft hole, priority support and positioning of the installation tool in the shaft hole can be achieved, eliminating the need for manual adjustment of the axial position of the double-lip seal ring.

Claims

1. A helicopter engine double-lip seal installation tool, comprising a screw rod with a nut at one end, two compression blocks sleeved on and slidingly engaged with the screw rod, and a nut threadedly engaged with the screw rod, wherein the two compression blocks are arranged opposite to each other, characterized in that, It also includes a radial expansion mechanism that engages with the screw thread, the radial expansion mechanism being located between the two extrusion blocks.

2. The installation tool as described in claim 1, characterized in that, The radial expansion and contraction mechanism includes an adjusting cylinder that is threaded into the screw, a plurality of wedge-shaped support blocks that are threaded into the adjusting cylinder, and a spring sleeved on the screw. The outer circumferential wall of the adjusting cylinder is provided with a plurality of guide grooves that slide into the inclined surfaces of the wedge-shaped support blocks. The guide grooves are arranged at equal intervals along the axial direction of the adjusting cylinder. One end of the spring is connected to the extrusion block away from the nut, and the free end acts on the ends of the plurality of wedge-shaped support blocks.

3. The installation tool as described in claim 2, characterized in that, The number of wedge-shaped support blocks is set to three or six.

4. The installation tool as described in claim 2, characterized in that, A rubber pad layer is provided on the wall surface of the wedge-shaped support block along the outward expansion direction.

5. The installation tool as described in claim 2, characterized in that, Each of the wedge-shaped support blocks has a protrusion on its sidewall, and the guide groove has a strip-shaped groove on its sidewall that matches the protrusion. The strip-shaped groove is parallel to the inclined surface of the wedge-shaped support block.

6. The installation tool as described in claim 1, characterized in that, The extrusion block is generally disc-shaped, with tapered protrusions at both ends.

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