Maintenance tool and maintenance method for aircraft thrust reverser

Abstract

The embodiment of the invention provides a maintenance tool and a maintenance method for an aircraft thrust reverser, the maintenance tool comprises two clamping pieces, a fastening piece and a hinge repair assembly, the two clamping pieces are arranged in a spaced mode, two connecting lugs are contained between the two clamping pieces, each clamping piece is provided with a maintenance opening, and the maintenance openings of the two clamping pieces are coaxially arranged. The fastening piece is connected with the two clamping pieces so that the two clamping pieces can clamp the two connecting lugs. And at least part of the reaming assembly can extend into the maintenance opening to be in contact with the lug hole. According to the maintenance tool, the two connecting lugs are fixedly clamped through the two clamping pieces, meanwhile, due to the fact that the two maintenance openings are coaxially formed, when the connecting lug holes are maintained, the reaming precision and coaxiality of the two connecting lug holes can be effectively guaranteed, the two connecting lugs can be maintained at the same time, the maintenance cost is reduced, and the maintenance efficiency is improved. The maintenance period is shortened.

Description

Technical Field

[0001] This application relates to the field of aircraft maintenance technology, and in particular to a maintenance tooling and maintenance method for an aircraft thrust reverser. Background Technology

[0002] Thrust reversers are an important component of aircraft engine nacelles. During landing, they change the direction of airflow to slow the aircraft down and achieve a safe landing speed.

[0003] The lugs in the thrust reverser, as connecting structures, often develop cracks or wear damage during service due to the immense reverse aerodynamic loads they bear. During maintenance, it is crucial to maintain the original center position of the lug holes to ensure balanced stress distribution and safe aircraft landing. Otherwise, accelerated damage to the lug holes can occur, potentially leading to breakage.

[0004] However, existing maintenance methods suffer from problems such as ineffective control of maintenance accuracy and coaxiality, high maintenance costs, and long maintenance cycles. Summary of the Invention

[0005] In view of this, this application aims to provide a maintenance fixture and maintenance method for aircraft thrust reversers, solving the problem of difficulty in controlling maintenance accuracy and coaxiality in existing maintenance methods.

[0006] In a first aspect, this application provides a maintenance fixture for an aircraft thrust reverser. The thrust reverser includes two symmetrically arranged lugs, each lug having a lug hole. The maintenance fixture includes two clamping members, fasteners, and a hinge assembly. The two clamping members are spaced apart to accommodate the two lugs. Each clamping member has a maintenance opening, and the maintenance openings of the two clamping members are coaxially arranged. The fasteners are respectively connected to the two clamping members to clamp the two lugs. The hinge assembly is at least partially able to extend into the maintenance opening to contact the lug hole.

[0007] In one possible implementation, the maintenance opening includes a mounting slot and a through slot, the mounting slot for accommodating a lug. The through slot communicates with the mounting slot and is used to align the lug hole, with a portion of the repair assembly passing through the through slot and contacting the lug hole.

[0008] In one possible implementation, the maintenance fixture further includes a first positioning hole and a second positioning hole, the first positioning hole being disposed on one clamping member. The second positioning hole is disposed on another clamping member corresponding to the first positioning hole.

[0009] In one possible implementation, the maintenance fixture further includes a fastening hole, which is provided on the clamping member, and a fastener passes through the fastening hole.

[0010] In one possible implementation, the fastening hole includes a threaded through hole and a threaded blind hole opening toward the threaded through hole, the threaded through hole being disposed on one clamping member and the threaded blind hole being disposed on another clamping member. The fastener includes a bolt passing through the threaded through hole and the threaded blind hole to connect the two clamping members.

[0011] In one possible implementation, the maintenance fixture further includes a contact wall disposed on the outer contour surface of the clamping member, the contact wall being adapted to the mounting area of ​​the lug.

[0012] In one possible implementation, the reaming assembly includes a plurality of sleeves and a reamer, one of which is selectively mounted within the maintenance opening. Each sleeve includes a reaming port, and the reaming ports of the plurality of sleeves have different diameters. At least a portion of the reamer extends into the reaming port to contact a lug hole.

[0013] Secondly, this application provides a maintenance method for an aircraft thrust reverser, implemented using any of the aforementioned maintenance tooling, comprising: Install a clamping element on the outside of a lug; Install another clamping piece on the outside of the other lug; The two clamping parts are fastened to the outside of the two lugs by fasteners; The lug hole of the lug is gradually reamed using the reaming assembly until the inner diameter of the lug hole meets the preset parameters.

[0014] In one possible implementation, the maintenance method further includes: Crack detection and treatment are performed on the lugs that have undergone reaming. Based on the results of crack detection processing meeting the preset detection parameters, a protective layer is applied to the outer surface of the lug to obtain the target lug.

[0015] In one possible implementation, the maintenance method further includes: Obtain the target bushing corresponding to the target lug; The target bushing is installed into the lug hole of the target connector using a freezing process, so that the target bushing and the target connector have an interference fit.

[0016] Compared with the prior art, the beneficial effects of this application are: The maintenance fixture provided in this application uses two clamping parts to fix and clamp the two lugs. At the same time, since the two maintenance openings are coaxially set, the reaming accuracy and coaxiality of the two lug holes can be effectively guaranteed when performing maintenance operations on the lug holes. It can also perform maintenance on both lugs at the same time, reducing maintenance costs and shortening the maintenance cycle.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in 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.

[0019] Figure 1 This is one of the structural schematic diagrams of the maintenance tooling provided in the embodiments of this application; Figure 2 A second schematic diagram of the structure of a maintenance fixture provided in one embodiment of this application; Figure 3 A third schematic diagram of the structure of a maintenance fixture provided in one embodiment of this application; Figure 4 A schematic diagram of the structure of multiple sleeves in a maintenance fixture provided in one embodiment of this application; Figure 5 A flowchart of a repair method provided in one embodiment of this application; Explanation of reference numerals in the attached figures: 1. Maintenance tools; 11 Clamping element, 111 Maintenance opening, 112 Mounting slot, 113 Through slot, 114 First positioning hole, 115 Second positioning hole, 116 Contact wall. 12 fasteners, 13 sleeves. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, some of the aforementioned terms, besides indicating location or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] Firstly, this application provides a maintenance fixture 1 for an aircraft thrust reverser, such as... Figure 1 and Figure 3 As shown, the reverse thrust device includes two symmetrically arranged lugs, each lug having a lug hole. The maintenance fixture 1 includes two clamping members 11, fasteners 12, and a hinge assembly. The two clamping members 11 are spaced apart to accommodate the two lugs. Each clamping member 11 has a maintenance opening 111, and the maintenance openings 111 of the two clamping members 11 are coaxially arranged. The fasteners 12 are respectively connected to the two clamping members 11 to clamp the two lugs. The hinge assembly can at least partially extend into the maintenance opening 111 to contact the lug hole.

[0026] The aircraft thrust reverser system includes an upper thrust reverser rail and a rear grid ring. The upper thrust reverser rail consists of a rail beam with two lugs mounted on it. These lugs are the connection structure between the rear grid ring and the upper thrust reverser rail, and they are prone to damage during service.

[0027] Specifically, the two lugs are positioned close to each other and symmetrically, and the lug holes of the two lugs are also symmetrically positioned and coaxially arranged. In actual use, the wear of the two lug holes may not be exactly the same, and during maintenance, it is necessary to carry out targeted repairs based on the actual wear condition of each lug hole.

[0028] The repair fixture 1 provided in this application includes two clamping parts 11, fasteners 12, and a hinge assembly. The two clamping parts 11 are respectively disposed on both sides of the two lugs, and under the action of the fasteners 12, the two clamping parts 11 can clamp the two lugs.

[0029] Meanwhile, each clamping member 11 has a maintenance opening 111, which corresponds to the lug hole. That is, when two clamping members 11 are clamped at two lugs, the maintenance opening 111 of one clamping member 11 corresponds to the lug hole of one lug. The repair assembly can pass through the maintenance opening 111 into the lug hole to perform repairs on the inner wall of the lug hole, such as removing damage and enlarging the hole.

[0030] The maintenance fixture 1 provided in this application uses two clamping parts 11 to fix and clamp the two lugs. At the same time, since the two maintenance openings 111 are coaxially set, when performing maintenance operations on the lug holes, the reaming accuracy and coaxiality of the two lug holes can be effectively guaranteed, and the two lugs can be repaired at the same time, reducing maintenance costs and shortening the maintenance cycle.

[0031] It should be noted that the maintenance fixture 1 provided in this application can avoid replacing the entire slide rail beam, thus reducing maintenance costs.

[0032] Regarding the preparation of maintenance fixture 1, its three-dimensional model data can be obtained through 3D scanning. Based on the intact structural dimensions, a stainless steel fixture that precisely matches the original structure can be designed and manufactured. This can effectively control the accuracy of the reaming hole, ensure accurate coaxiality, and restore the original dimensions and functions of the structure.

[0033] In one possible implementation, such as Figure 1 As shown, the maintenance opening 111 includes a mounting groove 112 and a through groove 113. The mounting groove 112 is used to accommodate a lug. The through groove 113 communicates with the mounting groove 112 and is used to align the lug hole. A portion of the repair assembly passes through the through groove 113 and contacts the lug hole.

[0034] In this embodiment, the maintenance opening 111 includes a mounting groove 112 and a through groove 113. The mounting grooves 112 of the two clamping members 11 are close to each other and are used to receive lugs. The through groove 113 extends through the clamping member 11 and is aligned with the lug hole. When the two clamping members 11 are installed at the two lugs, the mounting groove 112 of one clamping member 11 is used to accommodate one lug, and the through groove 113 corresponds to the lug hole.

[0035] The shape of the mounting groove 112 is adapted to the shape of the ear. The mounting groove 112 can provide a limiting function for the ear. During the repair process, the mounting groove 112 can further constrain the overall positional stability of the repair device and ensure the accuracy of the repair.

[0036] It is worth noting that the mounting slot 112 has an irregular shape.

[0037] In one possible implementation, such as Figure 1 and Figure 3 As shown, the maintenance fixture 1 also includes a first positioning hole 114 and a second positioning hole 115. The first positioning hole 114 is disposed on a clamping member 11. The second positioning hole 115 is disposed on another clamping member 11, corresponding to the first positioning hole 114.

[0038] In this embodiment, one clamping member 11 is provided with a first positioning hole 114, and the other clamping member 11 is provided with a second positioning hole 115. The number of first positioning holes 114 corresponds to the number of second positioning holes 115. For example, there are four first positioning holes 114 and four second positioning holes 115.

[0039] After the two clamping parts 11 are aligned and installed, the first positioning hole 114 corresponds to the second positioning hole 115, which can help the installer quickly determine that the two clamping parts 11 are assembled in place.

[0040] In one possible implementation, such as Figure 1 and Figure 3 As shown, the maintenance fixture 1 also includes a fastening hole, which is provided on the clamping member 11, and the fastener 12 passes through the fastening hole.

[0041] In this embodiment, the two clamping members 11 are also provided with fastening holes for mounting the fastener 12. Specifically, there are multiple fastening holes, which are spaced apart around the mounting groove 112, so that the fastener 12 can provide fastening force in all directions around the lug.

[0042] Specifically, the fastening hole can be a through hole, and the fastener 12 can pass through the fastening holes on the two clamping parts 11 and then be fixed by the fastening nut.

[0043] In one possible implementation, the fastening hole includes a threaded through hole and a threaded blind hole opening toward the threaded through hole, the threaded through hole being disposed on one clamping member 11 and the threaded blind hole being disposed on another clamping member 11. The fastener 12 includes a bolt passing through the threaded through hole and the threaded blind hole to connect the two clamping members 11.

[0044] In one possible implementation, such as Figure 1 and Figure 2 As shown, the maintenance fixture 1 also includes a contact wall 116, which is disposed on the outer contour surface of the clamping member 11 and is adapted to the mounting area of ​​the lug.

[0045] In this embodiment, a contact wall 116 is provided on the outer contour surface of the clamping member 11, and the contact wall 116 is used for mounting with the mounting area of ​​the lug.

[0046] Specifically, the contact wall 116 is designed according to the shape of the mounting area of ​​the lug. For example, if the mounting area is an inclined surface, then the contact wall 116 is an inclined wall. In other words, the area on the slide rail beam near the lug is constructed to form the mounting area.

[0047] The contact wall 116 is provided with an anti-slip layer, which can increase the friction between the clamping member 11 and the slide rail beam, thereby further improving the positional stability of the repair device.

[0048] In one possible implementation, such as Figure 4 As shown, the reaming assembly includes multiple sleeves 13 and a reamer. One of the sleeves 13 is selectively installed within the maintenance opening 111. Each sleeve 13 includes a reaming port, and the reaming ports of the multiple sleeves 13 have different diameters. At least a portion of the reamer extends into the reaming port to contact the lug hole.

[0049] In this embodiment, the reaming assembly includes a plurality of sleeves 13 and a reamer, wherein the sleeves 13 are used for the connection structure between the clamping member 11 and the reamer.

[0050] In actual maintenance, multiple sleeves 13 are selectively installed into the maintenance opening 111. Each sleeve 13 includes a reaming port, and the diameters of the reaming ports of the multiple sleeves 13 are different. For example, if there are three sleeves 13, the diameters of the reaming ports of the three sleeves are L1, L2, and L3, respectively, and L1 < L2 < L3. Specifically, the reaming port diameters are installed into the clamping member 11 and the lug hole in ascending order. At least a portion of the reamer extends into the reaming port to contact the lug hole, and the reamer is used to ream the hole step by step.

[0051] Secondly, this application provides a maintenance method for an aircraft thrust reverser, implemented using the maintenance tooling 1 described above, such as... Figure 5 As shown, the repair methods include: S1, Install a clamping element on the outside of a lug; S2, install another clamping piece on the outside of another lug; S3, the two clamping parts are fastened to the outside of the two lugs by fasteners; S4, the lug hole of the lug is gradually reamed by the reaming assembly until the inner diameter of the lug hole meets the preset parameters.

[0052] In this embodiment, when repairing the lugs, firstly, a clamping member is installed on the outside of one lug, then another clamping member is installed on the outside of the other lug, and then fasteners are used to securely connect the clamping members to the lugs. Finally, a reaming assembly is used to ream each lug step by step, ensuring that the size of the lug hole meets preset parameters.

[0053] The preset parameters for each earpiece are calculated based on the actual damage to the earpiece. The preset parameters for two earpieces may be the same or different.

[0054] In one possible implementation, the maintenance method further includes: Crack detection and treatment are performed on the lugs that have undergone reaming. Based on the results of crack detection processing meeting the preset detection parameters, a protective layer is applied to the outer surface of the lug to obtain the target lug.

[0055] In one possible implementation, the maintenance method further includes: Obtain the target bushing corresponding to the target lug; The target bushing is installed into the lug hole of the target connector using a freezing process, so that the target bushing and the target connector have an interference fit.

[0056] In one specific embodiment, the maintenance method includes: (1) Remove the clamping bushing and remove the clamping bushing from the lug hole.

[0057] (2) Confirm the damage to the lugs. Use the fluorescence penetrant method to confirm the damage to the lugs. Inspect the damaged lugs and lug holes to confirm that the dimensions meet the repair requirements.

[0058] (3) Install the maintenance fixture. Install the maintenance fixture on the lugs and use a stepped sleeve to ream the lug holes on both sides step by step to precisely machine the holes to the required dimensions. Remove the maintenance fixture after machining.

[0059] The maintenance fixture consists of two clamping parts, fasteners, and sleeves of different sizes (gradually reamed sleeve sizes: 15.240mm, 16.3764mm, 17.932mm). Each clamping part has a positioning hole on each of its three sides. During maintenance, first place the two clamping parts on both sides of the lugs, ensuring the lugs are in the mounting slots of the clamping parts. Install the fasteners, and after confirming that the corresponding positioning holes on both clamping parts are aligned, tighten the fixing bolts to complete the fixture installation.

[0060] Next, install the sleeves into the maintenance openings and lug holes in ascending order of size. Use a reamer to ream the holes step by step. After completing one side, repeat the same operation to ream the lug holes on the other side until the lug holes on both sides meet the repair requirements. Remove the fixing bolts and remove the maintenance tooling.

[0061] (4) Use the fluorescence penetration method to confirm that there are no cracks in the lugs.

[0062] (5) Apply conversion coating and primer.

[0063] (6) Fabricate stainless steel flange bushings and perform heat treatment.

[0064] (7) Confirm that the flange bushing is undamaged, specifically by visual inspection and magnetic particle inspection to confirm whether the flange bushing is damaged.

[0065] (8) Chrome plating of flange bushings.

[0066] (9) Use dry ice or liquid nitrogen freezing method to install the flange bushing into the lug hole.

[0067] (10) Inspect the repair area.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A maintenance fixture for an aircraft thrust reverser, the thrust reverser comprising two symmetrically arranged lugs, each lug having a lug hole, characterized in that, The maintenance fixtures include: Two clamping members are provided, with the two clamping members spaced apart to accommodate the two lugs. Each clamping member has a maintenance opening, and the maintenance openings of the two clamping members are coaxially arranged. Fasteners are connected to the two clamping members respectively, so that the two clamping members clamp the two lugs; The hinge assembly is at least partially capable of extending into the maintenance opening to contact the lug hole.

2. The maintenance fixture according to claim 1, characterized in that, The maintenance opening includes: Mounting slot, the mounting slot being used to accommodate the lug; A through slot, communicating with the mounting slot, is used to align the lug hole, and a portion of the hinge assembly passes through the through slot and contacts the lug hole.

3. The maintenance fixture according to claim 1, characterized in that, The maintenance fixture also includes: A first positioning hole is provided on one of the clamping members; The second positioning hole is provided on another clamping member, corresponding to the first positioning hole.

4. The maintenance fixture according to claim 1, characterized in that, The maintenance fixture also includes: A fastening hole is provided on the clamping member, and the fastener passes through the fastening hole.

5. The maintenance fixture according to claim 4, characterized in that, The fastening hole includes a threaded through hole and a threaded blind hole with an opening facing the threaded through hole. The threaded through hole is provided on one of the clamping members, and the threaded blind hole is provided on the other clamping member. The fastener includes a bolt that passes through the threaded through hole and the threaded blind hole to connect the two clamping elements.

6. The maintenance fixture according to claim 1, characterized in that, The maintenance fixture also includes: A contact wall is provided on the outer contour surface of the clamping member, and the contact wall is adapted to the mounting area of ​​the lug.

7. The maintenance tooling according to any one of claims 1 to 6, characterized in that, The hinge assembly includes: Multiple sleeves are selected and installed in the maintenance opening. Each sleeve includes a reaming port, and the diameters of the reaming ports of the multiple sleeves are different. A reamer, at least a portion of which extends into the reaming opening to contact the lug hole.

8. A maintenance method for an aircraft thrust reverser, characterized in that, The maintenance method, implemented using any one of claims 1 to 7, comprises: Install a clamping element on the outside of a lug; Install another clamping piece on the outside of the other lug; The two clamping members are fastened to the outside of the two lugs by fasteners; The lug hole of the lug is reamed step by step using a reaming assembly until the inner diameter of the lug hole meets the preset parameters.

9. The maintenance method according to claim 8, characterized in that, The repair method also includes: The lug that has undergone the reaming process is subjected to crack detection treatment; Based on the results of the crack detection process meeting the preset detection parameters, a protective layer is applied to the outer surface of the lug to obtain the target lug.

10. The repair method according to claim 9, characterized in that, The repair method also includes: Obtain the target bushing corresponding to the target lug; The target bushing is installed into the ear hole of the target lug through a freezing process, so that the target bushing and the target lug are in an interference fit.

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