A tool for assisting in propeller installation

Abstract

This invention relates to a tool for assisting propeller installation, belonging to the field of mechanical structure design. The pressure block of this invention can be installed on the propeller head and connected to the screw. The pull rod is installed on the propeller's pitch control rod and connected to the tripod support. The handle passes through the screw. This invention can axially move the low-pitch stop ring of the propeller forward to avoid interference during propeller installation. After installation, the low-pitch stop ring can be returned to its original position without affecting the normal use of the propeller.

Description

Technical Field

[0001] This invention relates to a tool for assisting in propeller installation, which belongs to the field of mechanical structure design. Background Technology

[0002] The propeller is a forward-variable-pitch three-bladed propeller, mounted to the engine via eight propeller housing bolts through the propeller shaft (flange). The propeller features selectable constant speed, automatic pitch control, feathering, beta control, reverse pitch control, and low-pitch indication functions, and has a mechanical low-pitch stop device to separate normal and reverse pitch. Since beta control, reverse pitch control, and low-pitch indication functions require a low-pitch stop ring on the propeller, a low-pitch stop ring is located at the propeller tail. However, the presence of the low-pitch stop ring can interfere with the propeller's installation onto the engine. Therefore, during propeller installation, the low-pitch stop ring needs to be moved axially forward to facilitate the propeller's installation. Summary of the Invention

[0003] The purpose of this invention is to facilitate the smooth installation of a propeller onto an engine. This auxiliary tool can axially move the low-pitch stop ring of the propeller forward to avoid interference during propeller installation. After installation, the low-pitch stop ring can be returned to its original position without affecting the normal use of the propeller.

[0004] The technical solution of the present invention:

[0005] A tool for assisting in propeller installation includes a lever 4, a pressure block 8, a three-arm bracket 2, a screw 7, and a handle 1;

[0006] The three-arm bracket 2 is machined with three arms 3. Each arm 3 has a groove 2A for mounting a tie rod 4. A through hole is machined on the arm 3 perpendicular to the groove 2A. A cylindrical pin is passed through the through hole to fix the arm 3 and the tie rod 4. The connecting parts of the three arms 3 of the three-arm bracket 2 are machined with internal threaded holes for mounting screws 7.

[0007] One end of the pull rod 4 can be embedded in the groove 2A of the three-arm bracket 2, and the other end of the pull rod 4 is machined with a boss. A groove 2B is machined in the middle of the boss, and the nut is placed on the groove 2B.

[0008] The screw 7 has a through hole 2 machined at its head for mounting the handle 1; the middle of the screw 7 has an external thread for engaging with the internal thread of the three-arm bracket 2; and the tail of the screw 7 has another external thread.

[0009] The pressure block 8 is composed of cylinder one and cylinder two connected coaxially in sequence. The diameter of cylinder one is smaller than the diameter of cylinder two. Coaxial threaded holes and blind holes are sequentially machined along the axial direction at the center of the end face of cylinder one. The diameter of the blind hole is larger than the diameter of the threaded hole. Blind holes are machined along the axial direction at the center of the end face of cylinder two.

[0010] The threaded hole of cylinder 1 matches the external thread of screw 7, and the external thread at the tail of screw 7 is screwed into the blind hole of cylinder 1; screw 7 can rotate freely after installation.

[0011] The blind holes on both ends of the cylinder are connected to the head of the propeller.

[0012] The tool also includes felt, which is adhesively attached to the bottom of the pull rod 4 and the pressure block 8 to prevent damage to the parts during installation.

[0013] The groove 2A is a U-shaped groove.

[0014] The groove 2B is a U-shaped groove.

[0015] The beneficial effects of the present invention are as follows: The present invention can move the low-pitch stop ring of the propeller forward axially to avoid interference during propeller installation. After installation, the low-pitch stop ring can be returned to its original position without affecting the normal use of the propeller. Attached Figure Description

[0016] Figure 1 Installation diagram

[0017] Figure 2 Structural diagram

[0018] Figure 3 Three-arm support structure diagram

[0019] Figure 4 Tie rod structure diagram

[0020] Figure 5 Screw structure diagram

[0021] Figure 6 Compression block structure diagram

[0022] Among them: 1. Handle 2. Triple-arm bracket 2A. Groove one 2B. Groove two 3. Support arm 4. Tie rod 5. Small hexagonal flat nut 6. Oil pipe nut 7. Screw 8. Pressure block 9. Pitch rod 10. Low-pitch stop ring 11. Reverse propeller spring Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings:

[0024] A tool for assisting in propeller installation includes a lever 4, a pressure block 8, a three-arm bracket 2, a screw 7, and a handle 1;

[0025] The three-arm bracket 2 is machined with three arms 3. Each arm 3 has a groove 2A for mounting a tie rod 4. A through hole is machined on the arm 3 perpendicular to the groove 2A. A cylindrical pin is passed through the through hole to fix the arm 3 and the tie rod 4. The connecting parts of the three arms 3 of the three-arm bracket 2 are machined with internal threaded holes for mounting screws 7.

[0026] One end of the pull rod 4 can be embedded in the groove 2A of the three-arm bracket 2, and the other end of the pull rod 4 is machined with a boss. A groove 2B is machined in the middle of the boss, and the nut is placed on the groove 2B.

[0027] The screw 7 has a through hole 2 machined at its head for mounting the handle 1; the middle of the screw 7 has an external thread for engaging with the internal thread of the three-arm bracket 2; and the tail of the screw 7 has another external thread.

[0028] The pressure block 8 is composed of cylinder one and cylinder two connected coaxially in sequence. The diameter of cylinder one is smaller than the diameter of cylinder two. Coaxial threaded holes and blind holes are sequentially machined along the axial direction at the center of the end face of cylinder one. The diameter of the blind hole is larger than the diameter of the threaded hole. Blind holes are machined along the axial direction at the center of the end face of cylinder two.

[0029] The threaded hole of cylinder 1 matches the external thread of screw 7, and the external thread at the tail of screw 7 is screwed into the blind hole of cylinder 1; screw 7 can rotate freely after installation.

[0030] The blind holes on both ends of the cylinder are connected to the head of the propeller.

[0031] The tool also includes felt, which is adhesively attached to the bottom of the pull rod 4 and the pressure block 8 to prevent damage to the parts during installation.

[0032] The groove 2A is a U-shaped groove.

[0033] The groove 2B is a U-shaped groove.

[0034] The implementation process is as follows:

[0035] Install the three tie rods 4 from the tool for installing the auxiliary propeller onto the top of the three small hexagonal flat nuts 5;

[0036] Press the pressure block 8 against the lubricating oil pipe nut 6 of the piston head;

[0037] Turn the handle 1, and the screw 7 will be slowly screwed in. At the same time, the three pull rods 4 will drive the three pitch rods 9 to move forward axially. Since the three pitch rods 9 and the low pitch stop ring 10 are connected by threads, the low pitch stop ring 10 will move forward axially.

[0038] Install the washer and propeller housing bolts through the engine shaft cam onto the propeller and tighten them to complete the propeller installation;

[0039] As the three counter-rotating springs 11 are compressed during the above process, after the propeller installation is completed, the handle 1 is turned in the opposite direction and the screw 7 is slowly unscrewed. Under the elastic force of the counter-rotating springs 11, the pitch rod 9 and the low-pitch stop ring 10 are moved axially back to their original positions. Then, the tools for auxiliary propeller installation are removed, and the propeller is installed on the engine.

Claims

1. A tool for assisting in propeller installation, characterized in that, It includes a pull rod (4), a pressure block (8), a three-arm bracket (2), a screw (7), and a handle (1); The three-arm bracket (2) is machined with three arms (3), each arm (3) has a groove (2A) for mounting a tie rod (4), and a through hole (1) is machined on the arm (3) perpendicular to the groove (2A). A cylindrical pin is passed through the through hole (1) to fix the arm (3) and the tie rod (4) together. The three arms (3) of the three-arm bracket (2) are machined with internal threaded holes for mounting screws (7). One end of the pull rod (4) can be embedded in the groove (2A) of the support arm (3) of the three-arm bracket (2), and the other end of the pull rod (4) is machined with a boss, and a groove (2B) is machined in the middle of the boss. The nut is placed on the groove (2B). The screw (7) has a through hole 2 at its head for mounting the handle (1); the middle part of the screw (7) has an external thread for engaging with the internal thread of the three-arm bracket (2); and the tail of the screw (7) has another external thread. The pressure block (8) is composed of cylinder one and cylinder two connected coaxially in sequence. The diameter of cylinder one is smaller than the diameter of cylinder two. Coaxial threaded holes and blind holes are sequentially machined along the axial direction at the center of the end face of cylinder one. The diameter of the blind hole is larger than the diameter of the threaded hole. Blind holes are machined along the axial direction at the center of the end face of cylinder two. The threaded hole of cylinder one matches the external thread of screw (7), and the external thread at the tail of screw (7) is screwed into the blind hole of cylinder one; screw (7) can rotate freely after installation; The blind holes on both ends of the cylinder are connected to the head of the propeller. Turn the handle (1), and the screw (7) will be slowly screwed in. At the same time, the three pull rods (4) will drive the three pitch rods (9) to move forward axially. The three pitch rods (9) and the low pitch stop ring (10) are connected by threads. The low pitch stop ring (10) will move forward axially. To avoid interference during propeller installation; During the above process, the three counter-rotating springs (11) are compressed. After the propeller installation is completed, the handle (1) is turned in the opposite direction and the screw (7) is slowly unscrewed. The pitch rod (9) and the low-pitch stop ring (10) move axially back to their original positions under the elastic force of the counter-rotating springs (11). The tool also includes felt, which is glued to the bottom of the pull rod (4) and the pressure block (8) with adhesive to prevent damage to the parts during the installation of the pull rod (4) and the pressure block (8). The second groove (2B) is a U-shaped groove.

2. The tool for assisting propeller installation according to claim 1, characterized in that, The groove 1 (2A) is a U-shaped groove.

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