Aircraft starter gear disassembly device and method

Abstract

The application discloses a kind of aircraft starter gear dismounting device and dismounting method, its device includes: holding part is structured as by two separable half circular ring supports relative splicing structure, the lower end of each half circular ring support is provided with the inner side boss for abutting the lower end face of gear to be dismounted, the upper end of each half circular ring support is provided with the upper boss with half circular hole;Threaded cylinder, the lower end of the threaded cylinder has stop position outer boss;Ring, it is set on the threaded cylinder for from outside ring two the upper boss;Threaded rod is structured as lower side circumferential surface has the outer thread of round rod.The application can realize the dismounting of starter gear, improve maintenance efficiency and reduce maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of aircraft starter gear dismounting device. BACKGROUND

[0002] The operating environment of aircraft starter is usually high speed, high temperature, and this operating environment is extremely strict to shaft and gear.The structure and performance of an important part that gear is driven in the direction of shaft and keeps stable determine the good and bad of starter state.At the same time, the internal structure of starter is precise, and the interaction between parts is close, and one hair can move the whole body.Generally, after running for a period of time, it is disassembled and repaired when starting problem or other failure is encountered.At this time, the combination of gear and rotor shaft in starter is very close, and it is very difficult to disassemble.The gear dismounting has the following requirements:

[0003] (1) the shape, size and other inspection parameters of the disassembled rotor shaft and gear must meet the requirements of aircraft component maintenance manual (CMM);

[0004] (2) the inspection parameters of other related parts must meet the requirements of aircraft component maintenance manual (CMM);

[0005] (3) the test data of the reassembled starter should meet the requirements of aircraft component maintenance manual (CMM)。

[0006] If the shaft or gear and other parts are damaged during gear dismounting, more complex repair procedures need to be performed, or even expensive shaft and gear need to be replaced.The precise structural parts of starter are usually imported, and the cost is high.If damaged and need to be replaced, it will cost a lot and cannot meet the maintenance cycle.

[0007] As shown in Figure 1 and 2 , in the starter, the rotor is installed in the space inside the retainer 1, and the rotor shaft 2 of the rotor has a gear 3 fixed on the upper end, which is used to transmit the rotation of the rotor to the planetary gear.The installation space of rotor shaft 2 and gear 3 in retainer 1 is very small.There is a retainer hole 1a with a diameter slightly larger than the outer diameter of gear 3 in the middle of the upper surface of retainer 1, which is coaxial with rotor shaft 2.

[0008] Because the installation space of gear 3 in retainer 1 is very narrow, and because the gear 3 and rotor shaft 2 are high-precision parts, prying from the side to disassemble is very easy to damage the gear 3, rotor shaft 2 and related parts, and there is no tool or device to meet the gear dismounting requirements. SUMMARY

[0009] The present application aims to provide a kind of aircraft starter gear dismounting device, to realize the dismounting of starter gear, improve maintenance efficiency and reduce maintenance cost.

[0010] The object of the present application can be achieved by the following technical solutions.

[0011] An aircraft starter gear dismounting device comprises:

[0012] The holding part is configured to be relatively combined by two separable half-ring supports, the combined holding part is a hollow structure, the hollow structure matches the shape of the dismounted gear so that the combined holding part wraps the dismounted gear, the lower end of each half-ring support is provided with an inner side boss for abutting the lower end surface of the dismounted gear, the upper end of each half-ring support is provided with an upper boss with a semicircular hole, and the semicircular holes of the two upper bosses are combined into a circular hole after the two half-ring supports are combined.

[0013] The threaded cylinder is configured to be a hollow cylinder body with internal threads, and the lower end of the threaded cylinder is provided with a gear position outer boss.

[0014] The ring hoop is configured to be a ring structure with an internal shape matching the shape of the two upper bosses on the combined holding part, so that the two half-ring supports of the holding part can be combined and held in a cylindrical shape, and the ring hoop is sleeved on the threaded cylinder for ring-hooping the two upper bosses from the outside.

[0015] The threaded rod is configured to be a round rod with external threads on the lower side surface, the threaded rod is connected with the threaded cylinder through threads and can make the lower end of the threaded rod extend below the gear position outer boss of the threaded cylinder.

[0016] The present application also has the following preferred designs:

[0017] The upper end of the hollow structure of the combined holding part of the two half-ring supports of the present application is an inner taper surface, and the gear position outer boss of the threaded cylinder has an outer taper surface with the same taper as the inner taper surface of the holding part. The gear position outer boss of the threaded cylinder can be fitted together with the hollow structure of the holding part, so that the movement is stable when the holding part is lifted by the threaded cylinder.

[0018] The threaded cylinder operation rod is connected to the threaded cylinder of the present application to facilitate hand holding and fixing the direction of the threaded cylinder.

[0019] As a feasible implementation manner, the threaded cylinder operation rod is provided with two rods and is connected with the threaded cylinder through threads, and the two threaded cylinder operation rods are vertically arranged with the threaded cylinder.

[0020] The threaded rod operation rod is connected to the threaded rod of the present application to facilitate hand holding and rotating the threaded rod.

[0021] As a feasible implementation manner, the threaded rod is provided with a through hole, and the threaded rod operation rod is vertically connected with the threaded rod through the through hole.

[0022] The second object of the present application is to provide a method for disassembling an aircraft starter gear, which uses the aircraft starter gear disassembling device described above, and comprises the steps of:

[0023] The half-circle ring supports are extended from the side space of the holder of the starter into the interior of the holder, the threaded cylinder is extended downward from the holder hole of the holder to move the gear position outer boss into the interior of the half-circle ring support, the two half-circle ring supports are combined into a holding part while wrapping the disassembled gear and the gear position outer boss of the threaded cylinder from the outside and abutting the lower end face of the disassembled gear through the inner boss of the half-circle ring support, the threaded cylinder is extended outward from the circular hole combined by the two upper bosses of the holding part, the ring hoop is sleeved on the upper bosses of the two half-circle ring supports to fix and clamp the two half-circle ring supports, the threaded rod is rotated downward to abut the rotor shaft installed on the holder of the starter from the threaded cylinder, the threaded rod is continuously rotated downward and fixed to make the threaded cylinder not rotate with the threaded rod, the threaded cylinder is moved upward to lift the holding part and the disassembled gear by a distance, until the connection between the disassembled gear and the rotor shaft is loosened, and then the disassembling device is removed, the disassembled gear is taken out from the hole of the holder by hand and / or tools.

[0024] The present application has the following beneficial effects:

[0025] The present application solves the problem that the aircraft starter gear cannot be disassembled due to the narrow installation space, and through the stable wrapping of the holding part on the disassembled gear, the cooperation with the threaded cylinder, the threaded rod and the like, the gear can be smoothly lifted along the axial direction of the rotor shaft, the disassembling process will not damage the gear and the rotor shaft, and the purpose of non-destructive disassembly is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the installation state of an aircraft starter gear of the present application;

[0027] Figure 2 is Figure 1 a top view of the present application;

[0028] Figure 3 is an exploded view of an aircraft starter gear disassembling device of the present application;

[0029] Figure 4 is a sectional view of the half-circle ring support in the embodiment;

[0030] Figure 5 is a sectional view of the ring hoop in the embodiment;

[0031] Figure 6 is a sectional view of the threaded cylinder in the embodiment;

[0032] Figure 7 is a sectional view of the threaded rod in the embodiment;

[0033] Figure 8 Figure 1 is a schematic diagram of the working principle of the dismounting device for dismounting the gear according to the present application.

[0034] Reference signs: 1-retainer, 1a-retainer hole, 2-rotor shaft, 3-gear, 4-semi-circular ring support, 4a-inner side boss, 4b-upper boss, 5-threaded cylinder, 5a-gear position outer boss, 5b-connection hole, 6-ring hoop, 7-threaded rod, 7a-through hole, 8-threaded cylinder operating rod, 9-threaded rod operating rod. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described in detail below in combination with the drawings and examples, so that the technical solutions of the present application can be better understood and implemented by the ordinary skilled in the art.

[0036] As shown in Figure 1, a dismounting device for dismounting the gear of an aircraft starter includes: Figures 3 to 8

[0037] The retaining portion is configured in a structure that is relatively split by two separable semi-circular ring supports 4. The interior of the split retaining portion is a hollow structure that matches the shape of the dismounted gear 3 so that the split retaining portion wraps around the dismounted gear 3. The lower end of each semi-circular ring support 4 is provided with an inner side boss 4a for abutting the lower end face of the dismounted gear 3. The upper end of each semi-circular ring support 4 is provided with an upper boss 4b having a semi-circular hole. After the two semi-circular ring supports 4 are split, the semi-circular holes of the two upper bosses 4b combine to form a circular hole.

[0038] The threaded cylinder 5 is configured as a hollow cylinder body with internal threads. The lower end of the threaded cylinder 5 has a gear position outer boss 5a.

[0039] The ring hoop 6 is configured as a ring structure with an internal shape that matches the shape of the two upper bosses 4b on the split retaining portion. The ring hoop 6 is sleeved on the threaded cylinder 5 to hoop the two upper bosses 4b from the outside.

[0040] The threaded rod 7 is configured as a circular rod with external threads on the lower side surface. The threaded rod 7 is connected to the threaded cylinder 5 by threads and can extend the lower end of the threaded rod 7 below the gear position outer boss 5a of the threaded cylinder 5.

[0041] In one embodiment, the upper end of the hollow structure of the split retaining portion of the two semi-circular ring supports 4 is an inner tapered surface. The gear position outer boss 5a of the threaded cylinder 5 has an outer tapered surface with the same taper as the inner tapered surface of the retaining portion. This allows the gear position outer boss 5a of the threaded cylinder 5 to fit together with the hollow structure of the retaining portion, making the movement stable when lifting the retaining portion by the threaded cylinder 5. The ring hoop 6 is sleeved on the cylindrical surface formed by the upper bosses 4b of the two semi-circular ring supports 4, so that the two semi-circular ring supports of the retaining portion maintain a cylindrical shape when being lifted and do not spread apart. ​

[0042] In one embodiment, a threaded cylinder 5 is connected with a threaded cylinder operating rod 8 to facilitate hand holding to fix the direction of the threaded cylinder 5.

[0043] Specifically, the threaded cylinder operating rod 8 can be provided with two rods and connected with the threaded cylinder 5 by welding, and a connecting hole 5b is provided on the upper side of the threaded cylinder 5 for connecting the threaded cylinder operating rod 8, and the two threaded cylinder operating rods 8 are arranged vertically with the threaded cylinder 5.

[0044] In one embodiment, a threaded rod 7 is connected with a threaded rod operating rod 9 to facilitate hand holding to rotate the threaded rod 7.

[0045] Specifically, a through hole 7a can be provided on the threaded rod 7, and the threaded rod operating rod 9 is connected with the threaded rod 7 through the through hole 7a.

[0046] The dismounting method of the aircraft starter gear dismounting device described above comprises the following steps:

[0047] In combination Figure 3 And Figure 8 , the semicircular ring supports 4 are extended from the side space of the holder 1 of the starter to the inside of the holder 1, before the two semicircular ring supports 4 are combined, the threaded cylinder 5 is extended downward from the holder hole 1a on the holder 1 to make the shift outer boss 5a move to the inside of the semicircular ring support 4, the two semicircular ring supports 4 are combined into a holding part while wrapping the dismounted gear 3 and the shift outer boss 5a of the threaded cylinder 5 from the outside and abutting the lower end surface of the dismounted gear 3 through the inner boss 4a of the semicircular ring support 4, the threaded cylinder 5 is extended outward from the circular hole composed of the two upper bosses 4b on the upper end of the holding part, the ring hoop 6 is sleeved on the upper bosses 4b of the two semicircular ring supports 4 to fix and clamp the two semicircular ring supports 4, the threaded rod 7 is rotated downward from the threaded cylinder 5 to abut the rotor shaft 2 installed on the holder 1 of the starter, the threaded rod 7 is continuously rotated downward and the direction of the threaded cylinder 5 is fixed to make the threaded cylinder 5 not rotate with the threaded rod 7, the threaded cylinder 5 is moved upward to lift the holding part and the dismounted gear 3 by a distance, until the connection between the dismounted gear 3 and the rotor shaft 2 is loosened, then the dismounting device is removed, and the dismounted gear 3 is taken out from the holder hole 1a by hand and / or tools.

[0048] The application effectively utilizes the side space of the cage and the inherent structure of the cage hole, and designs a special dismounting device. The gear 3 can be moved upward a small distance from the rotor shaft 2 to loosen the installation of the gear 3. In practical application, the rotor shaft 2 is generally a spline shaft and is provided with a taper, and the gear 3 will be loosened when it is moved upward a small distance from the rotor shaft 2. Then the gear 3 can be taken out of the cage hole 1 by hand and / or tools, and the maintenance of the gear 3 and the rotor shaft 2 is realized, thereby reducing the maintenance efficiency and maintenance cost of the installation structure. The dismounting device designed for the gear 3, because the height of the gear 3 to be lifted is small, the threaded cylinder 5 and the threaded rod 7 do not need to be provided with full threads, and the length of the threads matched with each other is slightly greater than the thickness of the gear 3. As a feasible operation mode, the threaded rod operation lever 9 rotates the threaded rod 7, and the threaded cylinder operation lever 8 fixes the direction of the threaded cylinder 5 during the dismounting process. The length of the threaded rod operation lever 9 needs to be designed according to the tightness of the combination of the gear 3 and the rotor shaft 2, and generally the length of the threaded rod operation lever 9 is 4 times the outer diameter of the gear, so that the gear 3 and the rotor shaft 2 are not easily damaged during the labor-saving dismounting.

[0049] The above embodiments are only the preferred embodiments of the application, but cannot be used as the limitation of the application, and any modification and improvement based on the concept of the application should fall into the protection scope of the application, and the specific protection scope is subject to the claims.

Claims

1. A method of disassembling an aircraft starter gear, characterized in that, The aircraft starter gear dismounting device used in the dismounting method comprises: a holding part configured as a structure of two separable half-circle ring supports being relatively combined, the holding part after being combined has a hollow structure matching the shape of the dismounted gear so that the holding part after being combined wraps the dismounted gear, the lower end of each half-circle ring support is provided with an inner side boss for abutting against the lower end face of the dismounted gear, and the upper end of each half-circle ring support is provided with an upper boss having a half-circle hole, the half-circle holes of the two upper bosses are combined into a round hole after the two half-circle ring supports are combined; a threaded cylinder configured as a hollow cylinder body having internal threads, the lower end of the threaded cylinder having a blocking outer boss; a ring hoop configured as a ring structure having an internal shape matching the shape of the two upper bosses on the holding part after being combined, the ring hoop being sleeved on the threaded cylinder for externally hoop- ing the two upper bosses; a threaded rod configured as a round rod having external threads on the lower side peripheral surface, the threaded rod being connected with the threaded cylinder through threads and being capable of extending the lower end of the threaded rod below the blocking outer boss of the threaded cylinder; the dismounting method comprising the following steps: extending the half-circle ring supports into the interior of the holding frame from the side space of the holding frame of the starter, before the two half-circle ring supports are combined, extending the threaded cylinder downward from the holding frame hole on the holding frame so that the blocking outer boss moves into the interior of the half-circle ring supports, combining the two half-circle ring supports into the holding part while externally wrapping the dismounted gear and the blocking outer boss of the threaded cylinder and abutting against the lower end face of the dismounted gear through the inner side boss of the half-circle ring support, extending the threaded cylinder outward from the round hole formed by the two upper bosses on the upper end of the holding part, fixing and hooping the two half-circle ring supports by sleeving the ring hoop on the upper bosses of the two half-circle ring supports, rotating the threaded rod downward to abut against the rotor shaft installed on the holding frame of the starter from the threaded cylinder, continuing to rotate the threaded rod downward and fixing the direction of the threaded cylinder so that the threaded cylinder does not rotate with the threaded rod, moving the threaded cylinder upward to lift the holding part and the dismounted gear by a distance, loosening the connection between the dismounted gear and the rotor shaft, then dismounting the dismounting device, and taking out the dismounted gear from the holding frame hole by hand and / or tools.

2. The method of claim 1, wherein: The upper end of the hollow structure of the holding part after the two half-circle ring supports are combined is an inner tapered surface, and the blocking outer boss of the threaded cylinder has an outer tapered surface with the same taper as the inner tapered surface of the holding part.

3. The method of claim 2, wherein: A threaded cylinder operating rod is connected with the threaded cylinder.

4. The method of claim 3, wherein: Two threaded cylinder operating rods are provided and are in threaded connection with the threaded cylinder, and the two threaded cylinder operating rods are vertically arranged with the threaded cylinder.

5. The method of claim 4, wherein: A threaded rod operating rod is connected with the threaded rod.

6. The method of claim 5, wherein: A through hole is provided on the threaded rod, and the threaded rod operating rod is vertically connected with the threaded rod through the through hole.

Images