Assembly method of a power turbine transmission shaft assembly with a novel torque measuring structure

Abstract

The present invention discloses a method for assembling a power turbine transmission shaft assembly with a novel torque measuring structure, comprising the following steps: S1, single-piece machining of the power turbine transmission shaft, the torque measuring reference shaft, and the pin holes on any torque measuring tooth; S2, adjusting the position of the torque measuring reference shaft within the long axis using an angle adjustment tool, and then fixing the large end of the torque measuring reference shaft to any torque measuring tooth using a centering tool; S3, aligning the hole on any torsion measuring tooth with the large end hole of the torsion measuring reference shaft, and combining the pins; S4, designing a positioning ring, and dividing the inner hole of the positioning ring into five groups according to the outer diameter of the torsion measuring tooth; S5, connecting the torsion measuring tooth and the hole of the torsion measuring reference shaft using a stepped pin, and fixing the torsion measuring tooth angularly and axially; the present invention provides a processing and assembly method with high assembly precision, the ability to prevent part deformation, and good stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical processing and assembly, and in particular relates to an assembly method of a power turbine transmission shaft assembly with a novel torsion measuring structure. Background Art

[0002] The power turbine drive shaft assembly is a core rotating component of an aircraft engine, primarily responsible for transmitting and measuring torque and power. The power turbine drive shaft assembly consists of a torque reference shaft, a turbine drive shaft sleeved on its outer surface, torque measuring teeth 1 and 2, and multiple pins. The torque reference shaft is internally enclosed within the inner bore of the power turbine drive shaft. Its small end is secured to the power turbine drive shaft via a pin, while its large end is connected to torque measuring tooth 1 via a stepped pin. Torque measuring tooth 2 is also secured to the power turbine drive shaft via a pin. Both torque measuring tooth 1 and the torque reference shaft have a clearance fit with the power turbine drive shaft, resulting in relative rotation during operation. A 90° angle (+1°20', +20') is required between torque measuring teeth 1 and 2. During relative rotation, torque is calibrated by measuring the linear relationship between the change in this 90° angle (+1°20', +20') and torque, and the engine power is then calculated based on the torque.

[0003] The existing method of processing this component structure has the following processing difficulties: First, when assembling the pins, due to the interference fit between them and the torque measuring teeth and the torque measuring reference shaft, the combined impact force can easily cause the torque measuring teeth to stick tightly to the power turbine drive shaft, and the torque measuring reference shaft to stick tightly to the surface of the power turbine drive shaft, resulting in jamming; Second, the torque measuring reference shaft is a flexible shaft with a wall thickness of only 0.5mm. It is very easy to deform under force during processing, and the deformation amount cannot be detected; Third, the clearance between the torque measuring reference shaft and the power turbine shaft is 0.06-0.08mm. Iron chips generated during processing can easily enter the gap, causing the torque measuring reference shaft to get stuck, hindering its smooth relative rotation in the power turbine drive shaft; the above problems will cause the torque calibration to fail.

[0004] Patent publication number CN203981319U discloses a torsion gear angle adjustment fixture. The torsion gear reference shaft and the power turbine drive shaft are assembled and mounted on the torsion gear angle adjustment fixture. The torsion gear angle adjustment fixture includes: a base; a drive shaft support frame mounted on the base; a measuring device mounted on the base and corresponding to a first torsion gear on the torsion gear reference shaft and a second torsion gear on the power turbine drive shaft, measuring the verticality of the first torsion gear and the horizontality of the second torsion gear; and an adjustment device mounted on the base. The adjustment device includes a drive shaft and a graduated dial mounted on the drive shaft. The drive shaft is in transmission connection with the torsion gear reference shaft, causing the torsion gear reference shaft to rotate with the drive shaft. This patent only uses the torsion gear angle adjustment fixture to adjust the angle between the two torsion gears to meet assembly requirements, but does not address the problem of torsion gear assembly jamming. Summary of the Invention

[0005] The present invention mainly addresses the problems in the prior art where the torsion measuring teeth are tightly attached to the power turbine transmission shaft, the torsion measuring reference shaft is tightly attached to the surface of the power turbine transmission shaft, resulting in jamming, the deformation of the torsion measuring reference shaft cannot be detected, and iron chips easily enter the gap between the power turbine transmission shaft and the torsion measuring reference shaft during processing. The present invention proposes a method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure.

[0006] The technical solutions of the present invention are as follows:

[0007] A method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure comprises the following steps:

[0008] S1. Process the pin holes on the power turbine transmission shaft, the torque measuring reference shaft, and any torque measuring tooth before assembling them;

[0009] S2. Adjust the position of the torsion measurement reference shaft within the long shaft so that the holes on the torsion measurement reference shaft and the long shaft are aligned, insert a pin into the hole, and center and secure the large end of the torsion measurement reference shaft and any one of the torsion measurement teeth; the large end of the torsion measurement reference shaft has a larger outer diameter; the long shaft is the long shaft portion of the power turbine transmission shaft;

[0010] S3. Align the hole on any torsion measuring tooth with the large end hole of the torsion measuring reference shaft and assemble the pins;

[0011] S4. Using the precision outer circle on the power turbine transmission shaft as the positioning outer circle, design a positioning ring, and divide the inner holes ΦD of the positioning ring into at least five groups according to the outer circle size of the torsion measuring teeth;

[0012] S5. Connect the torsion measuring tooth and the hole of the torsion measuring reference shaft to fix the torsion measuring tooth in the angular and axial directions.

[0013] Furthermore, in step S2, an angle adjustment tool is used to adjust the position of the torsion measurement reference axis within the long axis.

[0014] Furthermore, the outer circle of the angle adjustment tool is matched with the inner hole of the torsion measurement reference shaft, and the boss of the angle adjustment tool is clamped in the end face groove of the torsion measurement reference shaft.

[0015] Furthermore, a centering fixture is used to fix the large end of the torsion measuring reference shaft to any torsion measuring tooth, and the outer circle of the centering fixture is matched with the inner hole of the power turbine transmission shaft.

[0016] Furthermore, the outer circle of the centering tool Φ21.98~Φ22.08 is divided into 6 groups, each group is 0.02 mm.

[0017] Furthermore, the inner hole of the centering fixture matches the outer circle of the torsion measurement reference shaft.

[0018] Furthermore, the coaxiality of the inner and outer circles of the centering tool is no more than 0.01 mm.

[0019] Furthermore, in step S3, during the process of the torsion measuring reference shaft being assembled with the pin, the torsion measuring reference shaft and the inner hole of the power turbine transmission shaft always remain coaxial.

[0020] Furthermore, in step S4, the runout of the two inner holes of the positioning ring is no more than 0.005 mm.

[0021] Furthermore, the positioning ring is provided with at least three positioning holes.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention adopts a process method of drilling a single piece and then assembling it, that is, the pin holes on the power turbine transmission shaft, the torque measuring reference shaft, and the torque measuring tooth are first processed and then assembled, and an angle adjustment tool is used to adjust the position of the torque measuring reference shaft in the long axis so that the holes on the torque measuring reference shaft and the long axis are aligned, and the pin is assembled into the hole, and a centering tool is used to center and fix the large end of the torque measuring reference shaft and the torque measuring tooth; then, the hole on the torsion measuring tooth is aligned with the large end hole of the torque measuring reference shaft, and the pin is assembled. The deformation of the torsion measuring reference shaft is small, the processing accuracy is high, and the deformation of the parts can be directly checked during and after processing, avoiding the risk of iron chips entering the gap between the power turbine transmission shaft and the torque measuring reference shaft.

[0024] 2. The present invention utilizes the precise parts on the power turbine transmission shaft to design a centering and positioning fixture, thereby ensuring the uniformity of the gaps between the torque measuring reference shaft, the torque measuring gear and the power turbine transmission shaft after assembly, thereby avoiding the problem of surface adhesion and jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic structural diagram of the power turbine transmission shaft assembly of the present invention;

[0026] Figure 2 A schematic diagram of the angle relationship between the first torsion measuring tooth and the second torsion measuring tooth of the present invention;

[0027] Figure 3 for Figure 2 Middle YY section view;

[0028] Figure 4 This is a schematic diagram of the assembly of the positioning ring of the present invention;

[0029] Figure 5 This is a schematic diagram of the centering and limiting assembly of the torque measurement reference shaft of the present invention;

[0030] Figure 6 This is a schematic diagram of the installation angle adjustment of the torque measurement reference axis of the present invention;

[0031] In the above figure, 1. power turbine transmission shaft; 2. torque measuring reference shaft; 3. torque measuring tooth 1; 4. torque measuring tooth 2; 5. pin 1; 6. pin 2; 7. pin 3; 8. positioning ring; 9. latch; 10. centering tool; 11. angle adjustment tool. DETAILED DESCRIPTION

[0032] In order to clearly illustrate the technical features of the application scheme of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0034] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0037] Example 1

[0038] like Figures 1 to 6 As shown, a method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure includes the following steps:

[0039] S1. Process the pin holes on the power turbine transmission shaft 1, the torque measurement reference shaft 2, and the torque measurement gear 3 before assembling them;

[0040] S2. Use the angle adjustment tool 11 to adjust the position of the torsion measurement reference shaft 2 within the long axis so that the holes on the torsion measurement reference shaft 2 and the long axis are aligned. Insert the pins into the holes. Then use the centering tool 10 to center and secure the large end of the torsion measurement reference shaft 2 and the torsion measurement tooth 1 3. The large end of the torsion measurement reference shaft 2 has a larger outer diameter. The long axis is the long axis portion of the power turbine transmission shaft 1.

[0041] S3. Align the hole on the torsion measuring tooth 1 3 with the large end hole of the torsion measuring reference shaft 2, and assemble the second pin 6 and the third pin 7;

[0042] S4. Using the precision outer circle on the power turbine transmission shaft 1 as the positioning outer circle, design the positioning ring 8. Divide the inner hole of the positioning ring 8 ΦD into at least five groups according to the outer circle size of the torsion measuring tooth 3;

[0043] S5. Use a stepped pin to connect the torsion measuring tooth 3 and the hole of the torsion measuring reference shaft 2, and fix the torsion measuring tooth 3 angularly and axially to complete the assembly of the power turbine transmission shaft assembly.

[0044] In this embodiment, the pin holes on the power turbine drive shaft 1, the torque measurement reference shaft 2, and the torque measurement gear 3 are machined as a single piece. The position of the torque measurement reference shaft 2 within the long shaft is then adjusted using an angle adjustment tool 11, aligning the torque measurement reference shaft 2 with the long shaft hole. The pins are then assembled into the holes. This single-piece drilling and subsequent assembly process minimizes deformation of the torque measurement reference shaft 2, achieving high machining accuracy. Part deformation can be directly inspected during and after machining, eliminating the risk of iron chips entering the gap between the power turbine drive shaft 1 and the torque measurement reference shaft 2.

[0045] In this embodiment, if Figure 4 As shown, in the above steps S2 and S4, when the torsion measuring tooth 3 is assembled, the precision outer circle Φ34 on the power turbine transmission shaft 1 is used as the positioning outer circle, and the runout of the precision outer circle in a single piece is not greater than 0.01mm; the positioning ring 8 is designed, and the runout of the two inner holes of the positioning ring 8 is not greater than 0.005mm, and the positioning ring 8 is fixed by three pins 9; according to the outer circle size of the torsion measuring tooth 3, the inner holes of the positioning ring 8 ΦD are divided into 5 groups, and the specific grouping data of the inner hole size of the positioning ring 8 ΦD are as follows: the inner hole size of the positioning ring 8 ΦD of the first group is Φ43 (+0.01, 0), and the inner hole size of the positioning ring 8 ΦD of the second group is Φ43 (0, -0.01), the inner hole size of the positioning ring 8ΦD of the third group is Φ43 (-0.01, -0.02), the inner hole size of the positioning ring 8ΦD of the fourth group is Φ43 (-0.02, -0.03), and the inner hole size of the positioning ring 8ΦD of the fifth group is Φ43 (-0.03, -0.04), and the fitting clearance is ensured to be no greater than 0.01mm, and finally the outer circle runout of the torsion measuring tooth 3 after assembly is ensured to be no greater than 0.05mm; three positioning holes are opened on the positioning ring 8, and the torsion measuring tooth 3 and the hole of the torsion measuring reference shaft 2 are connected by a step pin to fix the torsion measuring tooth 3 angularly and axially.

[0046] like Figure 1 As shown, the power turbine drive shaft assembly is assembled from a power turbine drive shaft 1, a torque measuring reference shaft 2, a torque measuring tooth 1 3, a torque measuring tooth 2 4, a pin 1 5, a pin 2 6, and a pin 3 7. The torque measuring tooth 1 3 and the torque measuring tooth 2 4 are symmetrical structures. After processing and assembling any one of the torque measuring teeth, the other can be automatically assembled into place without the need for repeated assembly, thereby saving assembly time and improving efficiency.

[0047] Example 2

[0048] like Figures 1 to 6As shown, a novel method for assembling a power turbine transmission shaft assembly with a torsion measuring structure is provided. In this embodiment, the adjustment tool is an angle adjustment tool 11, and the installation angle adjustment structure of the torsion measuring reference shaft 2 is as shown. Figure 6 As shown, the outer circle of the angle adjustment tool 11 matches the inner hole of the torsion measuring reference shaft 2, and the two raised frustums on the angle adjustment tool 11 are stuck in the end face groove of the torsion measuring reference shaft 2. When assembled, the tool handle is rotated to drive the torsion measuring reference shaft 2 to rotate for angular adjustment.

[0049] like Figure 5 As shown, in this embodiment, the outer circle of the centering tool 10 is matched with the inner hole Φ22 of the power turbine transmission shaft 1. Since the internal tolerance (0.1mm) of the power turbine transmission shaft 1 is relatively large, the matching clearance between the torsion reference axis 2 and the long axis is 0.06~0.08. In order to prevent the clearance from being eliminated due to excessive tolerance, the outer circle size of the centering tool 10 Φ21.98~Φ22.08 is divided into 6 groups, each group of 0.02mm, to better ensure that the torsion reference axis 2 is concentric with the long axis when the pins are assembled.

[0050] like Figure 5 As shown, the inner hole of the centering fixture 10 is matched with the outer circle Φ18 of the torsion reference shaft 2, and the coaxiality of the inner and outer circles of the centering fixture 10 is not greater than 0.01 mm. Through the restriction of the inner and outer circles of the centering fixture 10, the torsion reference shaft 2 is always coaxial with the inner hole of the power turbine transmission shaft 1 during the pin assembly process, thereby ensuring the uniformity of the gap.

[0051] Example 3

[0052] like Figures 1 to 6 As shown, a method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure includes the following steps:

[0053] S1. Process the pin holes on the power turbine transmission shaft 1, the torque measurement reference shaft 2, and the torque measurement gear 3 before assembling them;

[0054] S2. Use the angle adjustment tool 11 to adjust the position of the torsion measurement reference shaft 2 within the long axis so that the holes on the torsion measurement reference shaft 2 and the long axis are aligned. Insert the pins into the holes. Then use the centering tool 10 to center and secure the large end of the torsion measurement reference shaft 2 and the torsion measurement tooth 1 3. The large end of the torsion measurement reference shaft 2 has a larger outer diameter. The long axis is the long axis portion of the power turbine transmission shaft 1.

[0055] S3. Align the hole on the torsion measuring tooth 1 3 with the large end hole of the torsion measuring reference shaft 2, and assemble the second pin 6 and the third pin 7;

[0056] S4. Using the precision outer circle on the power turbine transmission shaft 1 as the positioning outer circle, design the positioning ring 8. Divide the inner hole of the positioning ring 8 ΦD into at least five groups according to the outer circle size of the torsion measuring tooth 3;

[0057] S5. Use a stepped pin to connect the torsion measuring tooth 3 and the hole of the torsion measuring reference shaft 2, and fix the torsion measuring tooth 3 angularly and axially to complete the assembly of the power turbine transmission shaft assembly.

[0058] In this embodiment, the inner hole of the positioning ring 8 ΦD is evenly divided into 8 groups according to the outer diameter of the torsion measuring tooth 1 3, so as to ensure that the fitting clearance is no greater than 0.01 mm. Ultimately, the outer diameter runout of the torsion measuring tooth 1 3 after assembly is ensured to be no greater than 0.05 mm. At the same time, the outer diameter runout of the torsion measuring tooth 2 4 after assembly is also ensured to be no greater than 0.05 mm.

[0059] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure, characterized in that: The following steps are involved: S1. Process the pin holes on the power turbine transmission shaft, the torque measuring reference shaft, and any torque measuring tooth before assembling them; S2. Adjust the position of the torsion measuring reference shaft within the long axis so that the holes on the torsion measuring reference shaft and the long axis are aligned, insert the pin into the hole, and then center and fix the large end of the torsion measuring reference shaft to any torsion measuring tooth; S3. Align the hole on any torsion measuring tooth with the large end hole of the torsion measuring reference shaft and assemble the pins; S4. Using the precision outer circle on the power turbine transmission shaft as the positioning outer circle, design a positioning ring, and divide the inner holes ΦD of the positioning ring into at least five groups according to the outer circle size of the torsion measuring teeth; S5. Connect the torsion measuring tooth and the hole of the torsion measuring reference shaft to fix the torsion measuring tooth in the angular and axial directions.

2. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 1 is characterized in that: In step S2, the position of the torsion measurement reference axis is adjusted using an angle adjustment tool.

3. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 2 is characterized in that: The outer circle of the angle adjustment tool is matched with the inner hole of the torsion measuring reference shaft, and the boss of the angle adjustment tool is clamped in the end face groove of the torsion measuring reference shaft.

4. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 1 is characterized in that: In step S2, a centering fixture is used to fix the large end of the torsion measuring reference shaft to any torsion measuring tooth, and the outer circle of the centering fixture is matched with the inner hole of the power turbine transmission shaft.

5. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 4 is characterized in that: The outer circle of the centering tool is Φ21.98~Φ22.08 and is divided into 6 groups, with each group consisting of 0.02 mm.

6. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 5 is characterized in that: The inner hole of the centering fixture matches the outer circle of the torsion measuring reference shaft.

7. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 6 is characterized in that: The coaxiality of the inner and outer circles of the centering tool is not greater than 0.01 mm.

8. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 1 is characterized in that: In step S3, during the process of the torsion measuring reference shaft being assembled with the pin, the torsion measuring reference shaft and the inner hole of the power turbine transmission shaft always remain coaxial.

9. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 1 is characterized in that: In step S4, the runout of the two inner holes of the positioning ring is no more than 0.005 mm.

10. The method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure according to claim 9, characterized in that: The positioning ring is provided with at least three positioning holes.

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