Auxiliary tool for assembling reduction gearbox

Abstract

According to the auxiliary tool for assembling the reduction gearbox, the reduction gearbox comprises a box body, an output shaft and a semicircular blocking piece, the output shaft is installed in the box body, an annular groove is formed in the upper end of the output shaft, a disc spring, a jaw sliding sleeve, a gear and a locking ferrule are installed on the output shaft, and the locking ferrule is provided with an outer flanging. The auxiliary tool is composed of a downward pressing module and a lower supporting module and used for compressing the disc spring so that the pair of semicircular blocking pieces can be conveniently installed between the annular groove and the outer flanging. A pressing head and a pair of guide sleeves are arranged on the downward pressing module, the lower end of the pressing head is in a ring sleeve shape, and a pair of operation openings used for placing semicircular separation blades are formed in the side wall of the pressing head; a pair of positioning columns, a pair of supporting columns and a pair of guide columns are arranged on the lower supporting module, the positioning columns are used for positioning the box body, the supporting columns are used for supporting the box body, and the guide columns are in sliding fit with the guide sleeves and used for guiding. According to the auxiliary tool, the disc spring can be compressed, so that the annular groove is exposed, and the semicircular separation blade can be conveniently mounted between the annular groove and the outer flange of the locking ferrule through the operation opening.

Description

Technical Field

[0001] This utility model relates to the field of aero-engine gearbox technology, and in particular to an auxiliary tooling for gearbox assembly. Background Technology

[0002] Depending on the application requirements, some aircraft engines need to be equipped with gearboxes to increase output torque.

[0003] As attached Figure 1 The illustrated aero-engine gearbox has an annular groove at the upper end of the output shaft 4. A disc spring 5, a jaw sleeve 6, a gear 7, and a locking ring 8 are mounted on the output shaft 4. The locking ring has an outwardly flanged edge. During assembly, a pair of semi-circular baffles 9 are installed between the annular groove and the outwardly flanged edge. The thrust generated by the disc spring 5 is transmitted to the output shaft 4 through the semi-circular baffles 9, rather than to the bearings and housing 3. The outwardly flanged edge of the locking ring prevents the semi-circular baffles from dislodging from the annular groove.

[0004] There are currently two assembly challenges: First, the disc spring has a large Hooke coefficient, so a large thrust must be applied to the gear during assembly to compress the disc spring and expose the ring groove; second, the locking collar and the semi-circular baffle are small in size, and the output shaft is installed inside the housing, leaving relatively narrow operating space, making it difficult to install the semi-circular baffle. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model discloses an auxiliary tooling for assembling a gearbox, the purpose of which is to compress the disc spring to expose the ring groove, so as to facilitate the installation of the semi-circular baffle.

[0006] Specifically, the present invention adopts the following technical solution:

[0007] An auxiliary fixture for assembling a gearbox includes a gearbox housing, an output shaft, and semi-circular baffles. The output shaft is installed inside the gearbox housing and has an annular groove at its upper end. A disc spring, a toothed sleeve, a gear, and a locking ring are mounted on the output shaft. The locking ring has an outwardly flanged edge. The auxiliary fixture consists of a pressing module and a supporting module. The pressing module is used to compress the disc spring to facilitate the installation of a pair of semi-circular baffles between the annular groove and the outwardly flanged edge. The pressing module has a pressing head and a pair of guide sleeves. The lower end of the pressing head is annular, and a pair of operating ports for inserting the semi-circular baffles are provided on the side wall of the pressing head. The supporting module has a pair of positioning posts, a pair of support posts, and a pair of guide posts. The positioning posts are used to position the gearbox housing, the support posts are used to support the gearbox housing, and the guide posts slide with the guide sleeves for guidance.

[0008] To further improve the technical solution, a connecting plate is provided at the output end of the output shaft, and a positioning plate is provided on the lower support module. The positioning plate is used to axially position the connecting plate of the output shaft.

[0009] To further improve the technical solution, a stepped shaft is provided at the lower part of the guide post. The stepped shaft is used to limit the pressing distance of the pressing module.

[0010] After implementing the above technical solution, the beneficial effects of this utility model compared to the prior art are:

[0011] This auxiliary tooling can position the gearbox housing and output shaft, ensuring that the pressure head can press coaxially onto the end face of the gear, and exposing the annular groove on the output shaft outward by compressing the disc spring.

[0012] This auxiliary tooling also has a pair of operating ports on the pressure head, which facilitates the installation of a pair of semi-circular baffles between the annular groove of the output shaft and the outer flange of the locking sleeve through the operating ports. Attached Figure Description

[0013] Appendix Figure 1 The diagram shown is a structural schematic of an aircraft engine gearbox.

[0014] Appendix Figure 2 The diagram shown is a schematic representation of the overall structure of this auxiliary tooling.

[0015] Appendix Figure 3 The attached image shows the attached image. Figure 2 Exploded view.

[0016] Appendix Figure 4 The diagram shown is a structural schematic of this auxiliary tooling before pressing.

[0017] Appendix Figure 5 The diagram shown is a schematic of the auxiliary tooling after pressing.

[0018] In the attached diagram: 1. Pressing module; 11. Pressure plate; 12. Pressing head; 121. Operating port; 13. Guide sleeve; 2. Lower support module; 21. Support plate; 22. Positioning post; 23. Guide post; 24. Support post; 25. Positioning plate; 3. Housing; 4. Output shaft; 5. Disc spring; 6. Jawed sliding sleeve; 7. Gear; 8. Locking collar; 9. Semi-circular baffle. Detailed Implementation

[0019] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of this utility model and are not intended to limit the scope of protection of this utility model. It should be noted that in the description of this utility model, terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of this utility model. It should also be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] See attached document Figure 1 A gearbox for an aircraft engine includes a housing 3, an output shaft 4, and a semi-circular baffle 9. The output shaft 4 is installed inside the housing 3. An annular groove is provided at the upper end of the output shaft 4. A disc spring 5, a toothed sliding sleeve 6, a gear 7, and a locking ring 8 are mounted on the output shaft 4. The locking ring 8 has an outwardly flanged edge. (See attached...) Figure 1 It can be seen that if a pair of semi-circular baffles 9 are to be installed in the annular groove, the disc spring 5 must be compressed to expose the annular groove.

[0021] Appendix Figure 2 This diagram shows an auxiliary tooling for assembling a gearbox, used to compress the disc spring 5 to facilitate the installation of a pair of semi-circular baffles 9 between the annular groove and the outer flange. Its structure and function are described in detail below.

[0022] See attached document Figure 2 and attached Figure 3 From the appendix Figure 2 and attached Figure 3 It can be seen that the auxiliary tooling consists of a pressing module 1 and a supporting module 2. The pressing module 1 includes a pressure plate 11, on which a pressing head 12 and a pair of guide sleeves 13 are installed. The lower end of the pressing head 12 is ring-shaped, and a pair of operating ports 121 for inserting semi-circular baffles 9 are provided on the side wall of the pressing head 12.

[0023] The lower support module 2 includes a support plate 21, on which a pair of positioning posts 22, a pair of support posts 24, and a pair of guide posts 23 are mounted. The top of each positioning post 22 has a positioning pin, which engages with a positioning hole on the housing 3. The two positioning posts 22 position the housing 3 using a two-pin configuration. The tops of the pair of support posts 24 have support surfaces that support the housing 3. After positioning the housing 3, the pressure head 12 is ensured to be coaxial with the output shaft 4. The guide posts 23 slide with the guide sleeve 13 to guide the lower pressure module 1, ensuring that the pressure head 12 is coaxially pressed against the end face of the gear 7 in the vertical direction.

[0024] In this embodiment, since a connecting plate is provided at the output end of the output shaft 4, a positioning plate 25 is also installed on the upper plate surface of the support plate 21. The function of the positioning plate 25 is to axially position the connecting plate and ensure that the output shaft 4 does not move axially during press-fitting.

[0025] In addition, a stepped shaft is provided at the lower part of the guide post 23, which is used to limit the pressing distance of the pressing module 1.

[0026] See attached document Figure 4 Before pressing, place the housing 3 on the positioning column 22 and the support column 24, and place the connecting plate on the positioning plate 25 to position and support the housing 3 and the output shaft 4. Then, use a press to apply pressure to the pressing module 1, causing the pressing module 1 to move downward.

[0027] See attached document Figure 5 After the pressing module 1 is pressed down, the pressing head 12 presses against the end face of the gear 7, overcoming the elastic force of the disc spring 5 and compressing the disc spring 5. At this time, the jaw sleeve 6, gear 7, and locking collar 8 move downward, exposing the annular groove. Since a pair of operating ports 121 are provided on the pressing head 12, the operating ports 121 leave space for fingers to enter and operate, and a pair of semi-circular baffles 9 can be installed in the annular groove through the operating ports 121. Then, the press is operated to make the pressing module 1 slowly move upward, so that the outer flange of the locking collar 8 fits over the outside of the pair of semi-circular baffles 9, preventing the semi-circular baffles 9 from coming out of the annular groove.

[0028] It is worth noting that the downward pressure of the press is ultimately applied to the housing 3 through the bearing. If you do not want the bearing and housing 3 to be stressed, you can precisely adjust the height of the positioning plate 25 so that the positioning plate 25 can bear the downward pressure of the press.

[0029] As described above, this auxiliary fixture can position the gearbox housing and output shaft, ensuring that the pressure head can coaxially press against the end face of the gear, and exposing the annular groove on the output shaft by compressing the disc spring. This auxiliary fixture also has a pair of operating ports on the pressure head, facilitating the installation of a pair of semi-circular baffles between the annular groove of the output shaft and the outer flange of the locking ring.

[0030] The parts not detailed herein are prior art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of protection of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary tooling for assembling a gearbox, the gearbox comprising a housing, an output shaft, and a semi-circular baffle, the output shaft being installed inside the housing, an annular groove being provided at the upper end of the output shaft, and a disc spring, a toothed sleeve, a gear, and a locking ring being mounted on the output shaft, the locking ring having an outwardly flanged edge, characterized in that: The auxiliary tooling consists of a pressing module and a supporting module, used to compress the disc spring so that a pair of semi-circular baffles can be installed between the annular groove and the outer flange. The pressing module is equipped with a pressing head and a pair of guide sleeves. The lower end of the pressing head is annular, and a pair of operating ports for inserting the semi-circular baffles are provided on the side wall of the pressing head. The supporting module is equipped with a pair of positioning posts, a pair of support posts, and a pair of guide posts. The positioning posts are used to position the housing, the support posts are used to support the housing, and the guide posts slide with the guide sleeves for guidance.

2. The auxiliary tooling for assembling a gearbox as described in claim 1, characterized in that: A connecting plate is provided at the output end of the output shaft, and a positioning plate is provided on the lower support module. The positioning plate is used to axially position the connecting plate of the output shaft.

3. The auxiliary tooling for assembling a gearbox as described in claim 1, characterized in that: A stepped shaft is provided at the lower part of the guide post, which is used to limit the pressing distance of the pressing module.

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