Method for assembling engine central transmission assembly driving stress test line

Abstract

The invention belongs to the technical field of aero-engine assembly, and provides a method for assembling an engine central transmission assembly driving a stress test line, and the method comprises the steps: decomposing an installed engine central transmission assembly into a housing unit, a squirrel cage unit, a dynamic stress test line, and a gear-bearing unit; fixing the middle section of the carded dynamic stress test line on the mouse cage unit, and pre-embedding the free section into the mouse cage unit; installing the squirrel cage unit on the intermediate case, and leading out the free section of the dynamic stress test line from the lead hole of the intermediate case; according to the design torque, the shell unit and the gear-bearing unit are sequentially installed in the airflow direction. According to the assembling method, all the units of the engine central transmission assembly are independently installed, operation is easy, the installation process is stable and reliable, the problem that the root of the dynamic stress testing line collides and scratches the matching face of the intermediate case in the installation process is solved, the assembling quality and efficiency are improved, and support is provided for an aero-engine dynamic stress measurement test.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engine assembly, and relates to an assembly method of an engine central transmission component that drives a stress test line. Background Art

[0002] During the engine assembly process, reliably installing components equipped with dynamic stress test lines and ensuring the quality of the dynamic stress test lines, so as to obtain dynamic stress data of relevant components during the test, is a key link in analyzing and solving the strength reliability of engine components during the development of aircraft engines.

[0003] According to the test requirements, the dynamic stress test line needs to be laid on the outer surface of the central transmission assembly cage. At the same time, the central transmission assembly, as a key structural component and supporting part of the aircraft engine, is installed on the intermediate casing. The mating surface between the central transmission assembly and the intermediate casing is a transition fit, with a theoretical maximum assembly clearance of only 0.02mm. When installing the central transmission assembly, a one-piece installation method is usually adopted. This method makes it extremely easy for the intermediate casing mating surface to collide and scrape against the root of the dynamic stress test line fixed section on the outer surface of the central transmission assembly cage, causing the dynamic stress test line to fail, making it impossible to obtain the component dynamic stress data signal, increasing the cost of aircraft engine trial production and delaying scientific research progress.

[0004] Therefore, designing an installation method that can reliably install the central transmission assembly while ensuring the quality of the dynamic stress test line on the central transmission assembly is of great significance for realizing the dynamic stress test of the central transmission assembly of an aircraft engine. Summary of the Invention

[0005] In order to solve the technical problem that when assembling an engine central transmission assembly with a stress test line using an integral installation method, the dynamic stress test lead is easily collided with and causes failure thereof, the present invention discloses an assembly method for an engine central transmission assembly with a stress test line, the method comprising the following steps: S1. Disassemble the central transmission assembly of the installed engine into the housing unit, squirrel cage unit, dynamic stress test line and gear-bearing unit; S2, fixing the combed middle section of the dynamic stress test line on the cage unit, and pre-embedding the free section into the interior of the cage unit; S3, installing the squirrel cage unit on the intermediate casing, and leading the free section of the dynamic stress test wire out from the lead hole of the intermediate casing; S4. According to the design torque, install the housing unit and the gear-bearing unit in sequence along the airflow direction.

[0006] Furthermore, in step S2, the middle section of the dynamic stress test line is fixed to the fence structure of the squirrel cage unit by a patch method.

[0007] Furthermore, there are multiple dynamic stress test lines, and the middle section of each dynamic stress test line is respectively set on a fence of the fence structure.

[0008] Furthermore, in step S2, after the free section of the dynamic stress test line is led out from the lead hole of the intermediate casing, the end of the dynamic stress test line is detachably fixed to the intermediate casing for installation and positioning.

[0009] Furthermore, the end of the free section of the dynamic stress test line is pasted on the intermediate casing, or a plurality of clamping positions are set on the intermediate casing along the lead direction to fix the free section of the dynamic stress test line, or a lead channel is set in the intermediate casing along the lead direction, and the free section of the dynamic stress test line is passed through the lead channel away from the assembly position.

[0010] Furthermore, in step S4, the housing unit and the gear-bearing unit are sequentially installed along the airflow direction according to the design torque, including: S41. Install the housing unit onto the intermediate casing along the airflow direction according to the designed torque, and fix the housing unit to the cage unit using a bolt assembly; S42. According to the design torque, the gear-bearing unit is mounted and fixed on the squirrel cage unit in the reverse direction of the airflow.

[0011] Furthermore, in step S42, the gear-bearing unit is mounted and fixed on the cage unit in a counter-airflow direction according to the design torque, including: S421, installing the gear-bearing unit into the cage unit in a direction counter to the airflow, so that the mounting groove on the gear-bearing unit is engaged with the protrusion on the housing unit; S422. Connect the gear-bearing unit and the squirrel cage unit with bolts according to the designed torque, and lock them with a locking plate.

[0012] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: the engine central transmission assembly assembly method that drives the stress test line of the present invention, by independently installing the engine central transmission assembly as a unit, is easy to operate, and the installation process is smooth and reliable; utilizing the structural characteristics of the squirrel cage assembly, when installing the squirrel cage assembly unit, the free section of the dynamic stress test line is buried in the squirrel cage assembly unit, thereby solving the problem of the root of the dynamic stress test line colliding and scraping against the intermediate casing mating surface during the installation of the central transmission assembly, achieving the goal of intact quality of the dynamic stress test line after installation, greatly improving the assembly quality and efficiency, and providing support for the dynamic stress measurement test of aircraft engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 A flow chart of the method for assembling the central transmission assembly of an engine driving a stress test line according to the present invention; Figure 2 This is a schematic diagram of fixing the middle section of the dynamic stress test line of the present invention; Figure 3 This is a schematic diagram of the free section of the dynamic stress test line of the present invention being pre-buried in the squirrel cage unit; Figure 4 A schematic diagram of the squirrel cage unit of the present invention being installed on an intermediate casing; Figure 5 A schematic diagram of the housing unit of the present invention being installed on an intermediate casing; Figure 6 Schematic diagram of the gear-bearing unit of the present invention being installed on a squirrel cage unit. DETAILED DESCRIPTION

[0015] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0016] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features of the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0017] The embodiment of the present invention discloses a method for assembling a central transmission assembly of an engine driving a stress test line, see Figure 1 As shown, the method includes the following steps: S1. Disassemble the central transmission assembly of the installed engine into the housing unit, squirrel cage unit, dynamic stress test line and gear-bearing unit; S2, fixing the middle section of the carded dynamic stress test line on the squirrel cage unit, and embedding the free section into the interior of the squirrel cage unit; S3, installing the squirrel cage unit on the intermediate cabinet, and leading the free section of the dynamic stress test line out of the lead hole of the intermediate cabinet; S4, according to the design torque, sequentially installing the housing unit and the gear-bearing unit along the airflow direction.

[0018] Further, in step S2, the middle section of the dynamic stress test line is fixed on the fence structure of the squirrel cage unit by a patch method. By embedding the middle section of the dynamic stress test line in the squirrel cage unit, the root of the dynamic stress test line can be prevented from colliding and scratching the mating surface of the intermediate cabinet when the squirrel cage unit is installed on the intermediate cabinet.

[0019] Further, the dynamic stress test line has a plurality of sections, and the middle section of each dynamic stress test line is arranged on one fence of the fence structure. Referring to Figure 2 When fixing the dynamic stress test line, each dynamic stress test line is fixed on one fence by a patch method after being combed. In order to prevent the dynamic stress test line from being damaged by pulling, the dynamic stress test line can be fixed in a slightly curved S curve manner, so that the length of the fixed dynamic stress test line is greater than the length of the fence.

[0020] Referring to Figure 3 and Figure 4 The free section of the dynamic stress test line is embedded in the interior of the squirrel cage unit, and then the squirrel cage unit is installed on the intermediate cabinet.

[0021] Further, in step S2, after leading the free section of the dynamic stress test line out of the lead hole of the intermediate cabinet, the end of the dynamic stress test line is detachably fixed on the intermediate cabinet for installation and limiting.

[0022] Further, the end of the free section of the dynamic stress test line is pasted on the intermediate cabinet, or a plurality of clamping positions are arranged on the intermediate cabinet along the lead direction to fix the free section of the dynamic stress test line, or a lead channel is arranged in the intermediate cabinet along the lead direction, and the free section of the dynamic stress test line is led out of the lead channel away from the assembly position.

[0023] Further, in step S4, referring to Figure 5 and Figure 6 According to the design torque, the housing unit and the gear-bearing unit are sequentially installed along the airflow direction, including: S41. Install the housing unit onto the intermediate casing along the airflow direction according to the designed torque, and fix the housing unit to the cage unit using a bolt assembly; S42. According to the design torque, the gear-bearing unit is mounted and fixed on the squirrel cage unit in the reverse direction of the airflow.

[0024] Furthermore, in step S42, the gear-bearing unit is mounted and fixed on the cage unit in a counter-airflow direction according to the design torque, including: S421, installing the gear-bearing unit into the cage unit in a direction counter to the airflow, so that the mounting groove on the gear-bearing unit is engaged with the protrusion on the housing unit; S422. Connect the gear-bearing unit and the squirrel cage unit with bolts according to the designed torque, and lock them with a locking plate.

[0025] The engine central transmission assembly assembly method of the present invention drives the stress test line. By independently installing the engine central transmission assembly as a unit, the operation is simple, and the installation process is smooth and reliable. By utilizing the structural characteristics of the squirrel cage assembly, the free section of the dynamic stress test line is buried in the squirrel cage assembly unit when the squirrel cage assembly unit is installed, thereby solving the problem that the root of the dynamic stress test line collides with or scrapes against the mating surface of the intermediate casing during the installation of the central transmission assembly, achieving the goal of maintaining the quality of the dynamic stress test line after installation, greatly improving the assembly quality and efficiency, and providing support for dynamic stress measurement tests of aircraft engines.

[0026] Obviously, those skilled in the art will understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible in the embodiments of the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for assembling a central transmission assembly of an engine driving a stress test line, characterized in that: The method comprises: Disassemble the central transmission assembly of the installed engine into the housing unit, squirrel cage unit, dynamic stress test line and gear-bearing unit; Fixing the combed middle section of the dynamic stress test line on the cage unit, and pre-embedding the free section into the interior of the cage unit; Install the squirrel cage unit on the intermediate casing, and lead the free section of the dynamic stress test wire out from the lead hole of the intermediate casing; According to the design torque, the housing unit and the gear-bearing unit are installed in sequence along the airflow direction.

2. The method for assembling an engine central transmission assembly with a stress test line according to claim 1, characterized in that: The middle section of the dynamic stress test line is fixed to the fence structure of the squirrel cage unit by a patch method.

3. The method for assembling an engine central transmission assembly with a stress test line according to claim 2, characterized in that: There are multiple dynamic stress test lines, and the middle section of each dynamic stress test line is respectively arranged on a fence of the fence structure.

4. The method for assembling an engine central transmission assembly with a stress test line according to claim 1, characterized in that: After the free section of the dynamic stress test line is led out from the lead hole of the intermediate casing, the end of the dynamic stress test line is detachably fixed on the intermediate casing for installation and positioning.

5. The method for assembling an engine central transmission assembly with a stress test line according to claim 4, characterized in that: The end of the free section of the dynamic stress test line is pasted on the intermediate casing, or a plurality of clamping positions are set on the intermediate casing along the lead direction to fix the free section of the dynamic stress test line, or a lead channel is set in the intermediate casing along the lead direction, and the free section of the dynamic stress test line is passed through the lead channel away from the assembly position.

6. The method for assembling an engine central transmission assembly with a stress test line according to claim 1, characterized in that: According to the design torque, the housing unit and the gear-bearing unit are sequentially installed along the airflow direction, including: According to the design torque, the housing unit is mounted on the intermediate casing along the airflow direction, and the housing unit and the cage unit are fixed by a bolt assembly; According to the design torque, the gear-bearing unit is mounted and fixed on the squirrel cage unit in the reverse direction of the airflow.

7. The method for assembling an engine central transmission assembly with a stress test line according to claim 6, characterized in that: According to the design torque, the gear-bearing unit is mounted and fixed on the squirrel cage unit in the reverse direction of the airflow, including: Install the gear-bearing unit into the squirrel cage unit in the direction against the airflow, so that the mounting groove on the gear-bearing unit fits with the protrusion on the housing unit; According to the design torque, the gear-bearing unit and the squirrel cage unit are connected by bolts and locked by locking plates.

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