A positioning device for engine accessory drive case mounting

Abstract

The application provides a positioning device for engine accessory drive gearbox installation, and belongs to the technical field of aero-engine assembly. Specifically, the positioning device comprises a reference matching structure, two parallel positioning shafts and a connecting frame. The reference matching structure is connected with the intermediate gearbox front drive gearbox mounting seat, and is provided with reference positioning holes corresponding to the mounting positioning holes. The two positioning shafts are connected with the center holes of the connecting seat, the axial distance is matched with the center distance of the center hole, and the axial length is consistent with the distance between the hanging mounting seat lugs. The relative positions of the reference positioning holes and the positioning shafts and the relative positions of the butt joint plane and the axis of the positioning shaft are set according to the matching size. The two positioning shafts are arranged between the lugs and coaxially positioned with the mounting hole to hang and mount the mounting seat. Moreover, the position of the positioning shaft can be adjusted according to the actual machining error of the part, so that the application range of the positioning device is improved. The device is accurate in positioning, reliable in structure, can realize one-time hanging assembly of the accessory drive gearbox, and improves the assembly precision and efficiency.

Description

Technical Field

[0001] This application relates to the field of aircraft engine assembly, and in particular to a positioning device for mounting an engine accessory transmission housing. Background Technology

[0002] During the assembly of aero-engine accessory transmission housings, the large dimensional tolerances of the center distance between the positioning holes of the accessory transmission housing mounting base make it difficult to determine the position of the mating suspension mounting base. Furthermore, the irregular shape and structure of the accessory transmission housing shell result in limited assembly space, requiring the accessory transmission housing to be hoisted twice during assembly. To reduce the number of reassemblies, the spatial positioning method needs to be improved.

[0003] In traditional positioning methods, when hoisting the accessory drive housing onto the engine, the front end of the accessory drive housing is fixed to the intermediate housing flange, and the rear end is fixed to the front housing's mounting bracket. The position of the intermediate housing is fixed due to assembly constraints, while the position of the mounting bracket is affected by the deformation of the front housing itself and the center distance of the positioning holes in the accessory drive housing assembly. Therefore, after hoisting the accessory drive housing, the mounting bracket needs to be positioned according to its dimensions before hoisting it again for installation. This requires hoisting the accessory drive housing twice during assembly, a time-consuming and labor-intensive process. Furthermore, because the accessory drive housing is a movable structure with a certain amount of axial movement, the axial positioning of the mounting bracket may be inaccurate. Poor coaxiality of the gear shaft can lead to abnormal wear of the drive shaft splines, triggering a metal shavings alarm during engine testing. Summary of the Invention

[0004] In view of this, this application provides a positioning device for mounting an engine accessory transmission housing, which solves the problems in the prior art and improves the assembly efficiency of the accessory transmission housing.

[0005] The positioning device for mounting an engine accessory transmission housing provided in this application adopts the following technical solution:

[0006] A positioning device for mounting an engine accessory transmission housing, comprising: A reference mating structure is used to mate with the front transmission housing mounting seat on the intermediate housing of the engine. The reference mating structure is provided with a reference positioning hole corresponding to the mounting positioning hole on the front transmission housing connecting flange structure on the accessory transmission housing. The front transmission housing connecting flange structure is used to mate with the front transmission housing mounting seat. Two parallel positioning shafts correspond to the center holes on the two connecting seats on the accessory transmission housing, respectively. The connecting seats are used to connect with the hanger mounting seats on the front engine housing. The center holes correspond to the mounting holes of the hanger mounting seats. The axial distance between the two positioning shafts matches the center distance between the center holes on the two connecting seats. The axial length of the positioning shafts is consistent with the spacing between the two opposite lugs on the hanger mounting seats. A connecting bracket is used to connect the reference mating structure and the positioning shaft. The reference mating structure is installed on one side of the connecting bracket, and the two positioning shafts are installed on the other side of the connecting bracket. When the reference mating structure and the front drive housing mounting seat are docked, the axial direction of the positioning shaft is parallel to the axial direction of the engine. Specifically, in the axial direction of the positioning shaft, the distance from the center of the reference positioning hole to the end face of the positioning shaft opposite to the reference mating structure matches the distance from the center of the mounting positioning hole to the end face of the center hole on the connecting seat opposite to the front drive housing connecting flange structure; in the direction perpendicular to the plane on the reference mating structure that mates with the front drive housing mounting seat, the distance from the plane on the reference mating structure that mates with the front drive housing mounting seat to the axis of the positioning shaft matches the distance from the plane on the front drive housing connecting flange structure that mates with the front drive housing mounting seat to the axis of the center hole on the connecting seat. After the reference mating structure and the front drive housing mounting base are connected, the installation position of the hanging mounting base is positioned based on the fact that the two positioning shafts are respectively located between two opposite lugs on the corresponding hanging mounting base and the mounting holes on the lugs are coaxial.

[0007] Optionally, the connecting frame includes a central rod and a support rod. One end of the central rod is fixedly connected to the reference mating structure, and the other end of the central rod is connected to the center of the support rod. The length direction of the support rod is parallel to the central rod, and both ends of the support rod are bent. The two positioning shafts are respectively installed at both ends of the support rod.

[0008] Optionally, diagonal tie rods are provided on both sides of the central rod. One end of the diagonal tie rod is connected to the end of the central rod near the reference mating structure, and the other end of the diagonal tie rod is connected between the center and the end of the support rod.

[0009] Optionally, each end of the support rod is provided with a first sliding seat and a first adjusting component. The positioning shaft is slidably mounted on the first sliding seat via a first slider. The sliding direction of the first slider on the first sliding seat is parallel to a first straight line. The first straight line is perpendicular to the axial direction of the positioning shaft and perpendicular to the plane on the reference mating structure that mates with the front drive housing mounting seat. The first adjusting component is mounted on the first sliding seat and is used to adjust the position of the first slider on the first sliding seat.

[0010] Optionally, the first sliding seat is mounted on the support rod via a second slider and a second sliding seat. The first sliding seat head and the second slider slide on the second sliding seat. The sliding direction of the second slider on the second sliding seat is perpendicular to the plane on the reference mating structure that mates with the front drive housing mounting seat. The second sliding seat is provided with a second adjustment component, and the second adjustment function adjusts the position of the second slider on the second sliding seat.

[0011] Optionally, the positioning shaft has through holes on both end faces, and a positioning bolt with one end passing through the through hole is provided on the positioning shaft, with a nut connected to the end of the bolt.

[0012] In summary, this application includes the following beneficial technical effects: The positioning device of this application provides accurate positioning, simple operation, and reliable structure for the installation of accessory transmission housings. It enables the accessory transmission housing to be hoisted and assembled in one go, effectively solving the problems of inaccurate spatial positioning and low assembly efficiency of accessory transmission housings. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the intermediate casing and the front casing in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the hanging mounting base in the embodiments of this application; Figure 3 This is a schematic diagram of the positioning tooling used in this application; Figure 4 A schematic diagram showing the design of the positioning tooling dimensions for this application.

[0015] Explanation of reference numerals in the attached drawings: 1. Intermediate housing; 11. Front housing; 12. Front drive housing mounting base; 13. Hanging mounting base; 14. Lug; 15. Mounting hole; 2. Reference mating structure; 21. Reference positioning hole; 3. Positioning shaft; 31. Positioning bolt; 4. Connecting frame; 41. Center rod; 42. Support rod; 43. Diagonal tie rod. Detailed Implementation

[0016] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0017] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0019] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects described can be practiced without these specific details.

[0021] This application provides a positioning device for mounting an engine accessory transmission housing.

[0022] like Figure 1 and Figure 2 As shown, for the actual installation of the accessory drive housing, the front drive housing connecting flange structure at the front end of the accessory drive housing is connected to the front drive housing mounting seat 12 on the intermediate housing 1. The front drive housing connecting flange structure is provided with mounting positioning holes for positioning with the front drive housing mounting seat 12. The two connecting seats at the rear of the accessory drive housing are installed on the two hanging mounting seats 13 on the front housing 11. The hanging mounting seats 13 have two opposing lugs 14, and the lugs 14 are provided with mounting holes 15. The connecting seats are provided with a center hole corresponding to the mounting holes 15. After the hanging mounting seats 13 and the connecting seats are connected, the accessory drive housing is installed by passing the connecting bolts through the mounting holes 15 and the center hole.

[0023] A positioning device for mounting an engine accessory transmission housing, comprising: like Figure 3 and Figure 4 As shown, the reference mating structure 2 is used to connect with the front drive housing mounting base 12 via bolts. The reference mating structure 2 has a reference positioning hole 21 corresponding to the mounting positioning hole. The reference mating structure 2 simulates the front drive housing connecting flange structure on the accessory drive housing. Two parallel positioning shafts 3 correspond to the center holes on the two connecting seats respectively. The axial distance between the two positioning shafts 3 matches the center distance between the center holes on the two connecting seats, and the axial length L2 of the positioning shafts 3 is consistent with the spacing between the two opposite lugs 14 on the hanging mounting base 13. The connecting frame 4 is used to connect the reference mating structure 2 and the positioning shafts 3. The reference mating structure 2 is installed on one side of the connecting frame 4, and the two positioning shafts 3 are installed on the other side of the connecting frame 4. When the reference mating structure 2 and the front drive housing mounting base 12 are connected, the axial direction of the positioning shafts 3 is parallel to the axial direction of the engine.

[0024] Specifically, in the axial direction of the positioning shaft 3, the distance L1 from the center of the reference positioning hole 21 to the end face of the positioning shaft 3 facing away from the reference mating structure 2 matches the distance from the center of the mounting positioning hole to the end face of the center hole on the connecting seat facing away from the front transmission housing connecting flange structure; in the direction perpendicular to the plane on the reference mating structure 2 that mates with the front transmission housing mounting seat 12, the distance L3 from the plane on the reference mating structure 2 that mates with the front transmission housing mounting seat 12 to the axis of the positioning shaft 3 matches the distance from the plane on the front transmission housing connecting flange structure that mates with the front transmission housing mounting seat 12 to the axis of the center hole on the connecting seat; after the reference mating structure 2 and the front transmission housing mounting seat 12 are mated, the installation position of the hanging mounting seat 13 is positioned based on the fact that the two positioning shafts 3 are simultaneously located between two opposite lugs 14 on the corresponding hanging mounting seat 13 and that the positioning shafts 3 and the lugs 14 are coaxial with the mounting hole 15.

[0025] The positioning fixture of this application simulates the front transmission housing connecting flange structure of the accessory transmission housing and designs a positioning shaft 3 corresponding to the center holes on the two connecting seats at the rear of the accessory transmission housing. This simulates the key positions of the intermediate housing 1 connecting the accessory transmission housing and the hanging mounting seat 13 on the front housing 11. Based on the reference fit structure 2 corresponding to the front transmission housing connecting flange structure and the relevant dimensions of the front transmission housing connecting flange structure and the center holes, the spatial position of the positioning shaft 3 is determined, thereby determining the position of the lug 14 of the hanging mounting seat 13, and ultimately determining the installation position of the hanging mounting seat 13. This application uses its positioning device to determine the position of the hanging mounting seat 13, eliminating the need to hoist the accessory transmission housing itself; hoisting is only required during the actual installation of the accessory transmission housing, thus improving the installation efficiency of the accessory transmission housing. Furthermore, the positioning of the hanging mounting seat 13 is based on the actual installation position of the accessory transmission housing, avoiding the inaccurate positioning caused by the instability of the axial movement of the accessory transmission housing itself when using the actual accessory transmission housing for positioning, thereby improving the installation accuracy of the accessory transmission housing.

[0026] The positioning shaft 3 has through holes on both end faces. A positioning bolt 31, with one end passing through one of the through holes, is mounted on the positioning shaft 3. A nut is connected to the end of the bolt 31. The positioning shaft 3 is located between the head of the positioning bolt 31 and the nut. The design of the positioning bolt 31 ensures alignment between the positioning shaft 3 and the mounting hole 15.

[0027] The connecting frame 4 includes a central rod 41 and a support rod 42. One end of the central rod 41 is fixedly connected to the reference mating structure 2 by bolts, and the other end of the central rod 41 is connected to the center of the support rod 42. For the fixed connection of the central rod 41 and the support rod 42, a sleeve can be provided at the center position of the support rod 42. The sleeve and the central rod 41 are interference-fitted and fixed by a boss positioning and limiting method to achieve the fixed connection of the central rod 41 and the support rod 42. Alternatively, the support rod 42 and the central rod 41 can be fixed by welding. The length direction of the support rod 42 is parallel to the central rod 41, and both ends of the support rod 42 are bent. The two positioning shafts 3 are respectively installed at both ends of the support rod 42.

[0028] Both sides of the central rod 41 are provided with diagonal tie rods 43. One end of the diagonal tie rod 43 is connected to the end of the central rod 41 near the reference mating structure 2, and the other end of the diagonal tie rod 43 is connected between the center and the end of the support rod 42. The diagonal tie rods 43 improve the stability of the connecting frame 4 structure and ensure the stability of the position of the positioning shaft 3 relative to the reference mating structure 2.

[0029] To accommodate machining errors in different accessory drive housings, adjustment mechanisms can be installed at both ends of the support rod 42. The positioning shaft 3 is mounted on the support rod 42 via these adjustment mechanisms. The position of the positioning shaft 3 is adjusted to ensure that the relative position of the positioning shaft 3 and the reference mating structure 2 conforms to the actual dimensions of different accessory drive housings. Furthermore, after the initial installation of the accessory drive housing, if machining errors exist in the housing and drive shaft, and the coaxiality of the drive shaft and gear shaft does not meet the requirements, the relative position of the positioning shaft 3 and the reference mating structure 2 can be readjusted based on the measured coaxiality data, i.e., the axial offset of the drive shaft relative to the gear shaft. This ensures the coaxiality of the drive shaft and gear shaft, thereby improving the installation accuracy of the accessory drive housing.

[0030] In one embodiment, the adjustment mechanism can be a three-axis electrically controlled translation stage, which can achieve displacement adjustment with an accuracy level of 0.01mm. When the positioning device is installed on the intermediate housing 1, the z-axis of the three-axis electrically controlled translation stage is parallel to the axial direction of the engine, and the y-axis is along the radial direction of the engine.

[0031] In this embodiment of the adjustment mechanism, both ends of the support rod 42 are provided with a first sliding seat and a first adjustment component. The positioning shaft 3 is slidably mounted on the first sliding seat via a first slider. The sliding direction of the first slider on the first sliding seat is parallel to a first straight line. The first straight line is perpendicular to the axial direction of the positioning shaft 3 and perpendicular to the plane on the reference mating structure 2 that mates with the front transmission housing mounting seat 12. The first adjustment component is mounted on the first sliding seat and is used to adjust the position of the first slider on the first sliding seat. The sliding of the positioning shaft 3 on the first sliding seat can adjust the distance between the axes of the two positioning shafts 3 to match the center distance of the two center holes on the actual accessory transmission housing. The first adjustment component can be a set screw bolted to the first sliding seat. The set screw is located at both ends of the first slider, and the length direction of the set screw is parallel to the sliding direction of the first slider.

[0032] The first sliding seat is mounted on the support rod 42 via a second slider and a second sliding seat. The first sliding seat head and the second slider slide on the second sliding seat. The sliding direction of the second slider on the second sliding seat is perpendicular to the plane on the reference mating structure 2 that mates with the front transmission housing mounting seat 12. The second sliding seat is provided with a second adjustment component, which adjusts the position of the second slider on the second sliding seat. By sliding the first sliding seat on the second sliding seat, the distance between the positioning shaft 3 and the plane on the reference mating structure 2 that mates with the front transmission housing mounting seat 12 can be adjusted. The second adjustment component adopts the same structural design as the first adjustment component.

[0033] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A positioning device for mounting an engine accessory transmission housing, characterized in that, include: A reference mating structure (2) is used to mate with the front transmission housing mounting seat (12) on the intermediate housing (1) of the engine. The reference mating structure (2) is provided with a reference positioning hole (21) corresponding to the mounting positioning hole on the front transmission housing connecting flange structure on the accessory transmission housing. The front transmission housing connecting flange structure is used to mate with the front transmission housing mounting seat (12). Two parallel positioning shafts (3) correspond to the center holes on the two connecting seats on the accessory transmission housing, respectively. The connecting seats are used to connect with the hanging mounting seat (13) on the front housing of the engine (11). The center holes correspond to the mounting holes (15) of the hanging mounting seat (13). The axial distance between the two positioning shafts (3) matches the center distance between the center holes on the two connecting seats. The axial length of the positioning shafts (3) is consistent with the spacing between the two opposite lugs (14) on the hanging mounting seat (13). A connecting frame (4) is used to connect the reference mating structure (2) and the positioning shaft (3). The reference mating structure (2) is installed on one side of the connecting frame (4), and the two positioning shafts (3) are installed on the other side of the connecting frame (4). When the reference mating structure (2) and the front transmission housing mounting seat (12) are docked, the axial direction of the positioning shaft (3) is parallel to the axial direction of the engine. In the axial direction of the positioning shaft (3), the distance from the center of the reference positioning hole (21) to the end face of the positioning shaft (3) facing away from the reference mating structure (2) matches the distance from the center of the mounting positioning hole to the end face of the center hole on the connecting seat facing away from the front transmission housing connecting flange structure; in the direction perpendicular to the plane on the reference mating structure (2) that mates with the front transmission housing mounting seat (12), the distance from the plane on the reference mating structure (2) that mates with the front transmission housing mounting seat (12) to the axis of the positioning shaft (3) matches the distance from the plane on the front transmission housing connecting flange structure that mates with the front transmission housing mounting seat (12) to the axis of the center hole on the connecting seat; After the reference mating structure (2) and the front transmission housing mounting base (12) are connected, the installation position of the hanging mounting base (13) is positioned based on the fact that the two positioning shafts (3) are located simultaneously between the two opposite lugs (14) on the corresponding hanging mounting base (13) and the mounting holes (15) on the positioning shafts (3) and the lugs (14) are coaxial.

2. The positioning device for mounting an engine accessory transmission housing according to claim 1, characterized in that, The connecting frame (4) includes a central rod (41) and a support rod (42). One end of the central rod (41) is fixedly connected to the reference mating structure (2), and the other end of the central rod (41) is connected to the center of the support rod (42). The length direction of the support rod (42) is parallel to the central rod (41). Both ends of the support rod (42) are bent. The two positioning shafts (3) are respectively installed at both ends of the support rod (42).

3. The positioning device for mounting an engine accessory transmission housing according to claim 2, characterized in that, Both sides of the central rod (41) are provided with diagonal tie rods (43). One end of the diagonal tie rod (43) is connected to the end of the central rod (41) near the reference mating structure (2), and the other end of the diagonal tie rod (43) is connected between the center and the end of the support rod (42).

4. The positioning device for mounting an engine accessory transmission housing according to claim 2, characterized in that, Both ends of the support rod (42) are provided with a first sliding seat and a first adjusting component. The positioning shaft (3) is slidably mounted on the first sliding seat via a first slider. The sliding direction of the first slider on the first sliding seat is parallel to a first straight line. The first straight line is perpendicular to the axial direction of the positioning shaft (3) and perpendicular to the plane on the reference mating structure (2) that is connected to the front drive housing mounting seat (12). The first adjusting component is mounted on the first sliding seat and is used to adjust the position of the first slider on the first sliding seat.

5. The positioning device for mounting an engine accessory transmission housing according to claim 4, characterized in that, The first sliding seat is mounted on the support rod (42) via the second slider and the second sliding seat. The first sliding seat head and the second slider slide on the second sliding seat. The sliding direction of the second slider on the second sliding seat is perpendicular to the plane on the reference mating structure (2) that is connected to the front transmission housing mounting seat (12). The second sliding seat is provided with a second adjustment component. The second adjustment function adjusts the position of the second slider on the second sliding seat.

6. The positioning device for mounting an engine accessory transmission housing according to claim 4, characterized in that, The positioning shaft (3) has through holes on both ends, and a positioning bolt (31) with one end passing through the through hole is provided on the positioning shaft (3). A nut is connected to the end of the screw of the positioning bolt (31).

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