Auxiliary disassembly tool for APU turbine shaft and connecting shaft

Abstract

The utility model discloses an auxiliary disassembly tool for an APU turbine shaft and a connecting shaft, which relates to the technical field of aviation auxiliary power units and solves the problem that the turbine shaft is easily damaged during the disassembly of the turbine shaft and the connecting shaft, and the disassembly operation is not convenient. An auxiliary disassembly tool for an APU turbine shaft and a connecting shaft according to an embodiment of the utility model comprises a sinking structure for installation to the center of an APU disassembly stand, and a rotation-limiting connector for engaging with the internal spline of the turbine shaft, wherein: the sinking structure is provided with a vertical mounting hole, the bottom of the rotation-limiting connector is inserted and installed in the mounting hole, and the rotation-limiting connector is relatively fixed to the sinking structure along the circumferential direction.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation auxiliary power units, in particular to an auxiliary disassembly tool for an APU turbine shaft and a connecting shaft. Background Art

[0002] Auxiliary power unit is referred to as APU, which is mainly composed of several LRU parts such as power section, load compressor, accessory gearbox and external parts. After running for a fixed period or encountering a fault, APU needs to be dispatched, cleaned, disassembled, repaired, and tested. In the process of disassembling APU, due to the special shape and structure of some parts and the high-precision matching requirements, secondary damage is easily caused during disassembly.

[0003] At present, when disassembling the turbine shaft of the power section and the connecting shaft of the load compressor, since the turbine shaft and the connecting shaft are connected by threaded fixing, the turbine shaft is usually first fixed vertically with pliers on a workbench, and then two tooling nuts are installed on the external threaded section of the connecting shaft away from the turbine end, and a wrench is used to drive the tooling nut located below to rotate in the opposite direction, thereby pressing the tooling nut above and driving the connecting shaft to rotate, thereby realizing the disassembly of the turbine shaft and the connecting shaft. However, due to the long length of the connecting shaft, it is inconvenient for the disassembly personnel to use a wrench to drive the nut to rotate. Secondly, since the turbine shaft is the core transmission shaft of the entire power section, directly fixing the turbine shaft with pliers is likely to cause damage to the turbine shaft, which in turn makes the parts unusable, increases additional maintenance costs, and even causes the parts to be scrapped. Utility Model Content

[0004] The purpose of the present application is to provide an auxiliary disassembly tool for an APU turbine shaft and a load compressor connecting shaft, so as to solve the problem that the turbine shaft is easily damaged during the disassembly of the turbine shaft and the connecting shaft, and the disassembly operation is not convenient enough.

[0005] In order to solve the above technical problems, the utility model adopts the following solutions:

[0006] The auxiliary disassembly tool of an APU turbine shaft and a connecting shaft of the present application comprises a sink structure for installation at the center of an APU disassembly stand, and a rotation-limiting connector for engaging with an internal spline of the turbine shaft, wherein:

[0007] The sinking platform structure is provided with a vertical mounting hole, the bottom of the rotation-limiting connecting piece is inserted and installed in the mounting hole, and the rotation-limiting connecting piece is relatively fixed to the sinking platform structure along the circumferential direction.

[0008] Optionally, the sink structure includes a square mounting section whose shape matches the rectangular hole in the center of the APU decomposition stand, a supporting section for supporting the sink structure, and a pedestal section for supporting the bottom of the turbine shaft;

[0009] The square installation section, the supporting section and the pedestal section are distributed in sequence from bottom to top and are integrated.

[0010] Optionally, the cross-sections of the supporting section and the pedestal section are both circular, and the supporting section and the pedestal section are coaxially arranged;

[0011] The diameter of the pedestal section is smaller than the diameter of the supporting section.

[0012] Optionally, the rotation-limiting connection member includes a spline segment meshing with the internal spline of the turbine shaft, and a mounting segment inserted into the mounting hole, and the spline segment and the mounting segment are fixedly connected;

[0013] The shape of the mounting hole and the shape of the mounting section are adapted to each other.

[0014] Optionally, the rotation-limiting connector further includes a transition section between the spline section and the mounting section, and the spline section, the transition section and the mounting section are integrated;

[0015] The cross-sectional shape of the transition section is circular;

[0016] A circular step matching the shape of the transition section is arranged on the top of the mounting hole, and the depth dimension of the circular step is smaller than the height dimension of the transition section.

[0017] Optionally, the mounting section has an edge for limiting its circumferential rotation, and the edge is arranged parallel to the axis of the mounting section;

[0018] The shape of the mounting section is any one of a triangular prism, a quadrangular prism, a pentagonal prism and a hexagonal prism.

[0019] Optionally, the cross-sectional shape of the mounting section is elliptical.

[0020] Optionally, a transverse hole is provided on the sink structure, and one end of the transverse hole away from the outer peripheral wall of the sink structure is connected to the mounting hole;

[0021] It also includes an auxiliary fixing piece for limiting the upward movement of the rotation-limiting connecting piece, and the auxiliary fixing piece is movably arranged in the transverse hole.

[0022] Optionally, the transverse hole is a threaded hole, and the auxiliary fixing member is a threaded rod or a screw adapted to the threaded hole.

[0023] Optionally, a limiting groove is provided on the rotation limiting connecting member, and the width and length of the limiting groove are both greater than the width and length of the auxiliary fixing member;

[0024] The auxiliary fixing piece is slidably connected to the transverse hole, and one end of the auxiliary fixing piece close to the transverse hole can be inserted into the limiting groove.

[0025] Beneficial effects of the utility model:

[0026] The present application provides a sink structure and a rotation-limiting connector inserted into the sink structure, so that after the internal spline of the turbine shaft is meshed with the spline of the rotation-limiting connector, the rotation of the turbine shaft can be limited, and then a wrench is used to drive the tooling nut located below to rotate in the opposite direction, thereby pressing the tooling nut above and driving the connecting shaft to rotate, thereby realizing the disassembly of the turbine shaft and the connecting shaft;

[0027] Compared with the prior art, the present application designs a rotation-limiting connector that matches the spline shape inside the turbine shaft based on the characteristics of the spiral connection between the turbine shaft and the connecting shaft, thereby realizing the disassembly of the turbine shaft and the connecting shaft. There is no need to use general fixing tools such as vises or C-type pliers to fix the turbine shaft, which would cause the turbine shaft to be easily damaged.

[0028] In addition, since the sink structure can be installed on the center of a dedicated APU disassembly bench, its height can be easily adjusted, thus avoiding the problem of the disassembly position being too high and the inconvenience of disassembly caused by fixing it on a conventional general workbench. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the prior art of this application when it is disassembled.

[0030] Figure 2 This is a schematic diagram of the main structure of an embodiment of the present application.

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of an embodiment of the present application.

[0032] Figure 4 It is a schematic diagram of the cross-sectional structure of the sinking platform structure in the embodiment of the present application.

[0033] Figure 5 It is a schematic diagram of the three-dimensional structure of the rotation-limiting connecting member in the embodiment of the present application.

[0034] Explanation of the accompanying drawings: 1-turbine shaft, 2-connecting shaft, 3-sunk structure, 31-mounting hole, 32-square mounting section, 33-supporting section, 34-base section, 35-circular step, 36-transverse hole, 4-rotation-limiting connector, 41-spline section, 42-mounting section, 43-transition section, 5-auxiliary fixing member. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0036] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] like Figures 2 to 5 As shown, this embodiment provides an auxiliary disassembly tool for an APU turbine shaft and a connecting shaft, comprising a sink structure 3 for installation at the center of an APU disassembly stand, and a rotation-limiting connector 4 for engaging with an internal spline of a turbine shaft 1, wherein:

[0040] The sinking platform structure 3 is provided with a vertical mounting hole 31 , and the bottom of the rotation-limiting connecting member 4 is inserted and installed in the mounting hole 31 , and the rotation-limiting connecting member 4 is relatively fixed to the sinking platform structure 3 along the circumferential direction.

[0041] Existing technologies such as Figure 1 As shown, the turbine shaft 1 and the connecting shaft 2 need to be installed on a workbench with pliers, and a conventional workbench is usually fixed in height, and the connecting shaft 2 is long. After the turbine shaft 1 is fixed, it is inconvenient to use a wrench to drive the tooling nut to reverse. Fixing the turbine shaft 1 with pliers is to use pressure to forcibly fix the turbine shaft 1. For the turbine shaft 1 with high precision requirements, deformation, damage and other problems are prone to occur.

[0042] In this embodiment, by providing a sink structure 3 and a rotation-limiting connector 4 inserted into the sink structure 3, the internal spline of the turbine shaft 1 is engaged with the spline of the rotation-limiting connector 4, so that the rotation of the turbine shaft 1 can be limited, and then a wrench is used to drive the tooling nut located below to rotate in the opposite direction, thereby pressing the tooling nut above and driving the connecting shaft 2 to rotate, thereby realizing the disassembly of the turbine shaft 1 and the connecting shaft 2;

[0043] Compared with the prior art, the present application designs a rotation-limiting connector 4 that matches the spline shape inside the turbine shaft 1 based on the characteristics of the spiral connection between the turbine shaft 1 and the connecting shaft 2, thereby realizing the disassembly of the turbine shaft 1 and the connecting shaft 2. There is no need to fix the turbine shaft 1 with general fixing tools such as vises or C-type pliers, which would cause the turbine shaft 1 to be easily damaged.

[0044] In addition, since the sink structure 3 can be installed on the center of a dedicated APU disassembly bench, its height can be easily adjusted, which can avoid the problem of the disassembly position being too high and the inconvenience of disassembly caused by fixing it on a conventional general workbench.

[0045] Specifically, in this embodiment, if Figure 3 As shown, the sink structure 3 includes a square mounting section 32 whose shape matches the rectangular hole in the center of the APU decomposition stand, a supporting section 33 for supporting the sink structure 3, and a base section 34 for supporting the bottom of the turbine shaft 1;

[0046] The square mounting section 32, the supporting section 33 and the pedestal section 34 are sequentially distributed from bottom to top and are integrated. By providing the square mounting section 32, the sinking platform structure 3 and the APU decomposition pedestal can be relatively fixed in the circumferential direction to prevent the sinking platform structure 3 from rotating, and the supporting section 33 can support the entire sinking platform structure 3, and the pedestal section 34 can be provided so that after the turbine shaft 1 is installed on the spline section 41 of the rotation-limiting connector 4, its bottom surface can be placed on the top surface of the pedestal section 34.

[0047] Specifically, in this embodiment, if Figure 3 and Figure 4 As shown, the cross sections of the supporting section 33 and the base section 34 are both circular, and the supporting section 33 and the base section 34 are coaxially arranged;

[0048] The diameter of the base section 34 is smaller than the diameter of the supporting section 33. The supporting section 33 is circular, which can ensure that the entire sinking structure 3 is placed stably.

[0049] Specifically, in this embodiment, if Figure 5 As shown, the rotation-limiting connecting member 4 includes a spline segment 41 meshing with the internal spline of the turbine shaft 1, and a mounting segment 42 inserted into the mounting hole 31, and the spline segment 41 and the mounting segment 42 are fixedly connected;

[0050] The shape of the mounting hole 31 matches the shape of the mounting section 42. In this embodiment, the mounting hole 31 is rectangular, and the mounting section 42 is rectangular, so as to prevent the rotation-limiting connector 4 from rotating relative to the sink structure 3 after being installed therein.

[0051] Specifically, in this embodiment, if Figure 5 As shown, the rotation-limiting connector 4 further includes a transition section 43 located between the spline section 41 and the mounting section 42, and the spline section 41, the transition section 43 and the mounting section 42 are integrally arranged;

[0052] The cross-sectional shape of the transition section 43 is circular;

[0053] The top of the mounting hole 31 is provided with a circular step 35 that matches the shape of the transition section 43, and the depth dimension of the circular step 35 is smaller than the height dimension of the transition section 43. By providing the transition section 43, the spline section 41 can be located above the sink structure 3, which is convenient for extracting the rotation-limiting connector 4 from the mounting hole 31 of the sink structure 3 when replacing it later.

[0054] Specifically, in this embodiment, if Figure 5 As shown, the mounting section 42 has an edge for limiting its circumferential rotation, and the edge is arranged parallel to the axis of the mounting section 42;

[0055] The shape of the mounting section 42 is any one of a triangular prism, a quadrangular prism, a pentagonal prism, and a hexagonal prism. In this embodiment, the shape of the mounting section 42 is a rectangular column in a quadrangular prism. The technicians can also set the mounting section 42 to other shapes such as a triangular prism, a pentagonal prism, and a hexagonal prism as needed, which will not be repeated here.

[0056] In some optional embodiments, the cross-sectional shape of the mounting section 42 may be set to an elliptical shape, which may also serve as a circumferential limit to avoid circumferential rotation.

[0057] Specifically, in this embodiment, if Figure 4 As shown, the sink structure 3 is provided with a transverse hole 36, and one end of the transverse hole 36 away from the outer peripheral wall of the sink structure 3 is connected to the mounting hole 31;

[0058] The auxiliary fixing member 5 is also included to limit the upward movement of the rotation-limiting connecting member 4, and the auxiliary fixing member 5 is movably arranged in the transverse hole 36. By arranging the auxiliary fixing member 5, a radial pressure can be provided for the rotation-limiting connecting member 4 to prevent the turbine shaft 1 and the connecting shaft 2 from being pulled out of the sinking platform structure 3 during the disassembly process.

[0059] Specifically, in this embodiment, the transverse hole 36 is a threaded hole, and the auxiliary fixing member 5 is a screw or a bolt adapted to the threaded hole. In this embodiment, the auxiliary fixing member 5 is a countersunk screw, and the technician can set it to a screw as needed.

[0060] In some optional embodiments, a limiting groove is provided on the rotation limiting connecting member 4, and the width and length of the limiting groove are both greater than the width and length of the auxiliary fixing member 5;

[0061] The auxiliary fixing member 5 is slidably connected to the transverse hole 36, and one end of the auxiliary fixing member 5 close to the transverse hole 36 can be inserted into the limiting groove. By providing the limiting groove on the rotation limiting connecting member 4, the auxiliary fixing member 5 slides into the limiting groove to clamp the rotation limiting connecting member 4 to prevent it from moving upward in the axial direction, thereby preventing the rotation limiting connecting member 4 from being pulled out of the sink structure 3 during the disassembly process of the turbine shaft 1 and the connecting shaft 2.

[0062] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An auxiliary disassembly tool for an APU turbine shaft and a connecting shaft, characterized in that: The invention comprises a sink structure (3) for being installed at the center of an APU disassembly stand, and a rotation-limiting connection member (4) for being engaged with an internal spline of a turbine shaft (1), wherein: The sinking platform structure (3) is provided with a vertical mounting hole (31), the bottom of the rotation-limiting connecting piece (4) is inserted and mounted in the mounting hole (31), and the rotation-limiting connecting piece (4) is relatively fixed to the sinking platform structure (3) along the circumferential direction.

2. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 1, characterized in that: The sink structure (3) comprises a square mounting section (32) whose shape matches the rectangular hole at the center of the APU decomposition stand, a supporting section (33) for supporting the sink structure (3) and a base section (34) for supporting the bottom of the turbine shaft (1); The square installation section (32), the supporting section (33) and the pedestal section (34) are distributed in sequence from bottom to top and are integrally arranged.

3. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 2, characterized in that: The cross sections of the supporting section (33) and the base section (34) are both circular, and the supporting section (33) and the base section (34) are coaxially arranged; The diameter of the base section (34) is smaller than the diameter of the supporting section (33).

4. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 1, characterized in that: The rotation-limiting connecting member (4) comprises a spline segment (41) meshing with the internal spline of the turbine shaft (1), and a mounting segment (42) inserted into the mounting hole (31), the spline segment (41) and the mounting segment (42) being fixedly connected; The shape of the mounting hole (31) and the shape of the mounting section (42) are adapted to each other.

5. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 4, characterized in that: The rotation-limiting connector (4) further comprises a transition section (43) located between the spline section (41) and the mounting section (42); the spline section (41), the transition section (43) and the mounting section (42) are integrally arranged; The cross-sectional shape of the transition section (43) is circular; A circular step (35) matching the shape of the transition section (43) is arranged at the top of the mounting hole (31), and the depth dimension of the circular step (35) is smaller than the height dimension of the transition section (43).

6. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 4, characterized in that: The mounting section (42) has an edge for limiting its circumferential rotation, and the edge is arranged parallel to the axis of the mounting section (42); The shape of the mounting section (42) is any one of a triangular prism, a quadrangular prism, a pentagonal prism and a hexagonal prism.

7. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 4, characterized in that: The cross-sectional shape of the mounting section (42) is elliptical.

8. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 1, characterized in that: The sink structure (3) is provided with a transverse hole (36), and one end of the transverse hole (36) away from the outer peripheral wall of the sink structure (3) is connected to the mounting hole (31); It also includes an auxiliary fixing member (5) for limiting the upward movement of the rotation-limiting connecting member (4), and the auxiliary fixing member (5) is movably arranged in the transverse hole (36).

9. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 8, characterized in that: The transverse hole (36) is a threaded hole, and the auxiliary fixing member (5) is a threaded rod or a screw adapted to the threaded hole.

10. The auxiliary disassembly tool for the APU turbine shaft and the connecting shaft according to claim 8, characterized in that: The rotation limiting connecting member (4) is provided with a limiting groove, and the width and length of the limiting groove are both greater than the width and length of the auxiliary fixing member (5); The auxiliary fixing member (5) is slidably connected to the transverse hole (36), and one end of the auxiliary fixing member (5) close to the transverse hole (36) can be inserted into the limiting groove.

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