Method for assembling power turbine transmission shaft assembly of novel torque measuring structure

Abstract

The invention discloses a method for assembling a power turbine transmission shaft assembly of a novel torque measuring structure. The method comprises the following steps that S1, pin holes in a power turbine transmission shaft, a torque measuring reference shaft and any torque measuring tooth are subjected to single-piece machining; s2, adjusting the position of the torsion measuring reference shaft in the long shaft by using an angle adjusting tool, and fixing the large end of the torsion measuring reference shaft with any torsion measuring tooth by using a centering tool; s3, aligning a hole in any torque measuring tooth with a hole in the large end of the torque measuring reference shaft, and combining a pin; s4, designing a positioning ring, and dividing inner holes of the positioning ring into five groups according to the excircle size of the torque measuring teeth; s5, connecting the hole of the torque measuring tooth and the hole of the torque measuring reference shaft through a step pin, and fixing the torque measuring tooth in the angular direction and the axial direction; the machining and assembling method is high in assembling precision, capable of preventing part deformation and good in stability.

Description

Technical Field

[0001] The 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 transmission shaft assembly is the core rotating part of the aircraft engine, which mainly plays an important role in transmitting and measuring torque and power. The power turbine transmission shaft assembly includes a torque measuring reference shaft and a power turbine transmission shaft sleeved on the outside thereof, a torque measuring tooth 1, a torque measuring tooth 2 and a plurality of pins, which are assembled by processing. The torque measuring reference shaft in the assembly is an inner package type, and the entire torque measuring reference shaft is contained in the inner hole of the power turbine transmission shaft. The small end is fixed to the power turbine transmission shaft through a pin, and the large end is connected to the torque measuring tooth 1 through a step pin. The torque measuring tooth 2 is fixed to the power turbine transmission shaft through a pin. The torque measuring tooth 1 and the torque measuring reference shaft are both clearance-matched with the power turbine transmission shaft, and relative rotation will occur during work. There is an angle requirement of 90 (+1°20', +20') between the torque measuring tooth 1 and the torque measuring tooth 2. During the relative rotation process, the torque is calibrated by measuring the linear relationship between the change in the angle 90 (+1°20', +20') between the torque measuring tooth 1 and the torque measuring tooth 2 and the torque, and then the engine power is calculated based on the torque.

[0003] The existing method for processing this component structure has the following processing difficulties: First, when the pin is combined, due to the interference fit between the torsion measuring tooth and the torsion measuring reference shaft, the combined impact force can easily cause the torsion measuring tooth to be tightly attached to the power turbine transmission shaft, and the torsion measuring reference shaft to be tightly attached to the surface of the power turbine transmission shaft, resulting in jamming; Second, the torsion 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 torsion measuring reference shaft and the power turbine shaft is 0.06-0.08mm, and iron filings generated during processing can easily enter the clearance, causing the torsion measuring reference shaft to be jammed, hindering its smoothness of relative rotation in the power turbine transmission shaft; The above problems will cause the torque calibration to fail.

[0004] The existing patent publication number CN203981319U discloses a torsion gear angle adjustment tooling, which is assembled with the torsion reference shaft and the power turbine transmission shaft and is arranged on the torsion gear angle adjustment tooling, and the torsion gear angle adjustment tooling includes: a base; a transmission shaft support frame, which is installed on the base; a measuring device, which is installed on the base and corresponds to the first torsion gear of the torsion reference shaft and the second torsion gear of the power turbine transmission shaft, and measures the verticality of the first torsion gear and the horizontality of the second torsion gear; an adjusting device, which is installed on the base and includes a transmission shaft and a dial sleeved on the transmission shaft, and the transmission shaft is connected to the torsion reference shaft in a transmission manner, so that the torsion reference shaft rotates with the transmission shaft. This patent only uses the torsion gear angle adjustment tooling to make the angle between the two torsion gears meet the assembly requirements, and does not solve the problem of torsion gear assembly jamming. Summary of the invention

[0005] The present invention is mainly aimed at the problems in the prior art that the torsion measuring teeth are in close contact with the power turbine transmission shaft, the torsion measuring reference shaft is in close contact with 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. A method for assembling a power turbine transmission shaft assembly with a novel torsion measuring structure is proposed.

[0006] The technical solution of the present invention is 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 measuring reference shaft in the long shaft so that the holes on the torsion measuring reference shaft and the long shaft are aligned, insert the pin into the hole, and fix the large end of the torsion measuring reference shaft and any torsion measuring tooth in a centered manner; the large end of the torsion measuring reference shaft is the end with 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 pin;

[0011] S4, using the precision outer circle on the power turbine transmission shaft as the positioning outer circle, designing a positioning ring, and dividing the inner hole ΦD of the positioning ring into at least five groups according to the outer circle size of the torsion measuring gear;

[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 the 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 measuring reference shaft, and the boss of the angle adjustment tool is clamped in the end face groove of the torsion measuring reference shaft.

[0015] Furthermore, a centering fixture is used to fix the large end of the torque measuring reference shaft to any torque 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 measuring reference shaft.

[0018] Furthermore, the coaxiality of the inner and outer circles of the centering tool is not greater 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, that is, the pin holes on the power turbine transmission shaft, the torsion measuring reference shaft, and the torsion measuring tooth are first processed and then assembled, and the position of the torsion measuring reference shaft in the long axis is adjusted by using an angle adjustment tool so that the holes on the torsion measuring reference shaft and the long axis are aligned, and the pin is assembled into the hole, and the large end of the torsion measuring reference shaft and the torsion measuring tooth are fixed by a centering tool; then the hole on the torsion measuring tooth is aligned with the large end hole of the torsion measuring reference shaft, and the pin is assembled, the deformation of the torsion measuring reference shaft is small, the machining accuracy is high, and the deformation of the parts can be directly checked during and after the machining, avoiding the risk of iron filings entering the gap between the power turbine transmission shaft and the torsion 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 structural schematic 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 It is a schematic diagram of assembling the positioning ring of the present invention;

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

[0030] Figure 6 This is a schematic diagram of adjusting the installation angle 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 one; 4. torque measuring tooth two; 5. pin one; 6. pin two; 7. pin three; 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", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly 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; "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like are intended to 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 representations 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 comprises the following steps:

[0039] S1. Process the pin holes on the power turbine transmission shaft 1, the torque measuring reference shaft 2 and the torque measuring gear 3 first and then assemble them;

[0040] S2. Use the angle adjustment tool 11 to adjust the position of the torsion reference shaft 2 in the long axis so that the holes on the torsion reference shaft 2 and the long axis are aligned, and the pins are assembled into the holes. Then, use the centering tool 10 to center and fix the large end of the torsion reference shaft 2 and the torsion measuring tooth 1 3; the large end of the torsion reference shaft 2 is the end with 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 combine the pin 2 6 and the pin 3 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, and 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 step 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 transmission shaft 1, the torsion measuring reference shaft 2, and the torsion measuring tooth 3 are processed in a single piece, and then the position of the torsion measuring reference shaft 2 in the long axis is adjusted using the angle adjustment tool 11, so that the torsion measuring reference shaft 2 and the hole on the long axis are aligned, and the pin is assembled into the hole. By adopting the process method of drilling a single piece and then assembling, the deformation of the torsion measuring reference shaft 2 is small, the processing accuracy is high, and the deformation of the parts can be directly checked during and after the processing, avoiding the risk of iron filings entering the gap between the power turbine transmission shaft 1 and the torsion measuring reference shaft 2.

[0045] In this embodiment, if Figure 4 As shown, in the above steps S2 and S4, when the torsion measuring gear 3 is combined, 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; a 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 gear 3, the inner hole ΦD of the positioning ring 8 is divided into 5 groups, and the specific grouping data of the inner hole size of the positioning ring 8ΦD are as follows: the inner hole size of the positioning ring 8ΦD of the first group is Φ43 (+0.01, 0), and the inner hole size of the positioning ring 8ΦD of the second group is Φ43 (0, -0.01), the inner hole size of the locating ring 8ΦD of the third group is Φ43 (-0.01, -0.02), the inner hole size of the locating ring 8ΦD of the fourth group is Φ43 (-0.02, -0.03), and the inner hole size of the locating ring 8ΦD of the fifth group is Φ43 (-0.03, -0.04), and the matching clearance is ensured to be no more than 0.01mm, and finally the outer circle runout of the torsion measuring tooth 3 after assembly is ensured to be no more than 0.05mm; three locating holes are opened on the locating ring 8, and the hole of the torsion measuring tooth 3 and 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 transmission shaft assembly is assembled by the power turbine transmission shaft 1, the torque measuring reference shaft 2, the torque measuring tooth 1 3, the torque measuring tooth 2 4, the pin 1 5, the pin 2 6, and the pin 3 7. Among them, 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 one can be automatically assembled into place without repeated assembly, which can save assembly time and improve 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 in FIG. 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 grooves 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 the present embodiment, the outer circle of the centering fixture 10 matches with the inner hole Φ22 of the power turbine transmission shaft 1. Since the inner 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 fixture 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 cooperates with the outer circle Φ18 of the torsion measuring reference shaft 2, and the coaxiality of the inner and outer circles of the centering fixture 10 is not greater than 0.01mm. Through the limitation of the inner and outer circles of the centering fixture 10, the torsion measuring 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 comprises the following steps:

[0053] S1. Process the pin holes on the power turbine transmission shaft 1, the torque measuring reference shaft 2 and the torque measuring gear 3 first and then assemble them;

[0054] S2. Use the angle adjustment tool 11 to adjust the position of the torsion reference shaft 2 in the long axis so that the holes on the torsion reference shaft 2 and the long axis are aligned, and the pins are assembled into the holes. Then, use the centering tool 10 to center and fix the large end of the torsion reference shaft 2 and the torsion measuring tooth 1 3; the large end of the torsion reference shaft 2 is the end with 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 combine the pin 2 6 and the pin 3 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, and 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 step 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, according to the outer circle size of the torsion measuring tooth 1 3, the inner hole of the positioning ring 8ΦD is evenly divided into 8 groups, which can ensure that the fitting clearance is no more than 0.01mm, and finally ensure that the outer circle runout of the torsion measuring tooth 1 3 after assembly is no more than 0.05mm, and also ensure that the outer circle runout of the torsion measuring tooth 2 4 after assembly is no more than 0.05mm.

[0059] Obviously, the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope 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, adjusting the position of the torsion measuring reference axis in the long axis so that the holes on the torsion measuring reference axis and the long axis are aligned, inserting the pin into the hole, and then centering and fixing the large end of the torsion measuring reference axis 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 pin; S4, using the precision outer circle on the power turbine transmission shaft as the positioning outer circle, designing a positioning ring, and dividing the inner hole ΦD of the positioning ring into at least five groups according to the outer circle size of the torsion measuring gear; 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 assembly method of a power turbine transmission shaft assembly of a novel torsion measuring structure according to claim 1 is characterized in that: In the step S2, the position of the torsion measurement reference axis is adjusted by using an angle adjustment tool.

3. The assembly method of a power turbine transmission shaft assembly of 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 of a novel torsion measuring structure according to claim 1 is characterized in that: In the 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 assembly method of a power turbine transmission shaft assembly of 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, each group is 0.02mm.

6. The method for assembling a power turbine transmission shaft assembly of 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 torque measuring reference shaft.

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

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