Mounting method for steel shaft bushing of aero-engine casing

Abstract

The invention relates to the technical field of aero-engines, in particular to an aero-engine casing steel shaft bushing mounting method which mainly comprises the following steps: firstly, an auxiliary mounting tool with scale marks is inserted into a steel shaft mounting hole of a flying attachment casing, so that the right end face of the auxiliary mounting tool completely abuts against the left end face of a steel shaft bushing; then knocking the left end of the auxiliary mounting tool by using a rawhide hammer to gradually push the steel shaft bushing to the engine accessory casing; and checking whether the scale marks of the auxiliary mounting tool are aligned with the left shell of the flying attachment casing or not, if so, indicating that the steel shaft bushing is mounted, and if not, repeating the steps until the scale marks are aligned with the left shell of the flying attachment casing. According to the method, the cylindrical copper bar replacing the scale marks is used as an auxiliary installation tool to be used for installing the steel shaft bushing in the aero-engine casing, the method is simple and effective, the installation efficiency is improved, and the situations that stress is uneven, the inner wall of the casing is damaged in a sliding mode and a sealing rubber ring outside the bushing is damaged in a clamping mode when the steel shaft bushing is assembled can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a method for installing a steel shaft bushing of an aeroengine casing. Background Art

[0002] The installation of steel shaft bushings in aircraft engine casings is currently done by contacting the bushing end face in a point-to-point manner with a mandrel, then using a rubber hammer to knock the mandrel to push the bushing toward the engine accessory casing until it hits the boss, and then using a caliper to measure the size. The process regulations require that the size from the bushing end face to the shaft housing plane be fixed. This method of installing the bushing with a mandrel results in the circular end face of the bushing being stressed only by the point that contacts the mandrel, and the circumference of the bushing end face cannot be evenly stressed. The bushing cannot move linearly as a whole to the specified position as required, which can easily cause the outer sealing rubber ring of the bushing to be stuck, and even the bushing itself to move crookedly and get stuck, and the required size cannot be guaranteed to be the actual value; the operation itself is also very difficult, and the one-point contact force is unstable, which can easily cause the mandrel to be dislocated when knocked, and cause slippage and damage to the inner wall of the flying accessory casing. Summary of the invention

[0003] In order to solve the existing problems, the present invention provides a method for installing a steel shaft bushing using an auxiliary installation tool with markings, aiming to solve the technical problems in the prior art that when installing the steel shaft bushing in an aircraft engine casing, the steel shaft bushing is easily subjected to uneven force, slips on the inner wall, and the outer sealing rubber ring of the bushing is stuck.

[0004] The technical solution adopted by the present invention is: a method for installing a steel shaft bushing of an aircraft engine casing, comprising the following steps:

[0005] Step 1: Insert the auxiliary installation tool with scale lines into the steel shaft installation hole of the flight accessory casing, so that the right end face of the auxiliary installation tool completely rests against the left end face of the steel shaft bushing;

[0006] The auxiliary installation tool is a cylindrical copper rod, the scale line of which is set on the left end of the auxiliary installation tool, and the distance between the scale line on the left end of the auxiliary installation tool and the left shell of the flying attachment casing is the same as the distance that the auxiliary installation tool pushes the steel shaft bushing to move when it is installed in place;

[0007] The right end of the auxiliary installation tool is sized to match the steel shaft bushing in the flight attachment receiver;

[0008] Step 2: Use a leather hammer to tap the left end of the auxiliary installation tool to gradually push the steel shaft bushing toward the engine housing;

[0009] Step 3: Check whether the scale line of the auxiliary installation tool is aligned with the left shell of the auxiliary receiver. If aligned, it means that the protrusion of the steel shaft bushing is against the boss of the auxiliary receiver, and the steel shaft bushing is installed. If not aligned, repeat step 2 until the scale line is aligned with the left shell of the auxiliary receiver.

[0010] The beneficial effects of the present invention are:

[0011] The present invention uses a cylindrical copper rod replacing a scale mark as an auxiliary installation tool for installing a steel shaft bushing in an aircraft engine casing. This is not only simple and effective, but can also improve installation efficiency. It can also avoid uneven force on the steel shaft bushing during assembly, slipping on the inner wall of the casing, and jamming of the outer sealing rubber ring of the bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the steel bushing in the aircraft engine casing before it is assembled in place;

[0013] Figure 2 This is a schematic diagram of the structure of the steel bushing in the casing of an aircraft engine after it is assembled in place;

[0014] Among them: 1. scale line; 2. flying accessory receiver; 3. steel shaft mounting hole; 4. steel shaft bushing; 5. protrusion; 6. boss; 7. flying accessory receiver; 8. auxiliary installation tools. DETAILED DESCRIPTION

[0015] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0016] like Figure 1-2 As shown, the present invention provides a method for installing a steel shaft bushing of an aircraft engine casing, comprising the following steps:

[0017] Step 1: insert the auxiliary installation tool 8 with the scale line 1 into the steel shaft installation hole 3 of the flying attachment casing 2, so that the right end surface of the auxiliary installation tool 8 completely rests on the left end surface of the steel shaft bushing 4;

[0018] Specifically, in this embodiment, the auxiliary installation tool 8 is preferably a cylindrical copper rod, and its scale line 1 is set on one end located outside the flying attachment casing 2, that is, Figure 1 The distance between the scale line 1 on the left end of the auxiliary installation tool 8 and the left side shell of the flying attachment casing 2 is the same as the distance that the auxiliary installation tool 8 pushes the steel shaft bushing 4 to move when it is installed in place;

[0019] The auxiliary installation tool 8 is inserted into one end of the flying casing 2, that is, Figure 2 The right end of the auxiliary installation tool 8 shown in the figure has an end face size that matches the steel shaft bushing 4 in the flying attachment casing 2, so as to ensure that the end face of the auxiliary installation tool 8 inserted into the flying attachment casing 2 can completely rest against the steel shaft bushing 4;

[0020] Step 2: Use a leather hammer to hit the left end of the auxiliary installation tool 8 to gradually push the steel shaft bushing 4 toward the engine casing 7;

[0021] Step three: Check whether the scale line 1 of the auxiliary installation tool 8 is aligned with the left shell of the flying accessory receiver 2. If aligned, it indicates that the protrusion 5 of the steel shaft bushing 4 is against the boss 6 of the flying accessory receiver 7, and the steel shaft bushing 4 is installed. If not aligned, repeat step two until the scale line 1 is aligned with the left shell of the flying accessory receiver 2.

[0022] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for installing a steel shaft bushing of an aircraft engine casing, characterized in that: The following steps are involved: Step 1: Insert the auxiliary installation tool with scale lines into the steel shaft installation hole of the flight accessory casing, so that the right end face of the auxiliary installation tool completely rests against the left end face of the steel shaft bushing; The auxiliary installation tool is a cylindrical copper rod, the scale line of which is set on the left end of the auxiliary installation tool, and the distance between the scale line on the left end of the auxiliary installation tool and the left shell of the flying attachment casing is the same as the distance that the auxiliary installation tool pushes the steel shaft bushing to move when it is installed in place; The right end of the auxiliary installation tool is sized to match the steel shaft bushing in the flight attachment receiver; Step 2: Use a leather hammer to tap the left end of the auxiliary installation tool to gradually push the steel shaft bushing toward the engine housing; Step 3: Check whether the scale line of the auxiliary installation tool is aligned with the left shell of the auxiliary receiver. If aligned, it means that the protrusion of the steel shaft bushing is against the boss of the auxiliary receiver, and the steel shaft bushing is installed. If not aligned, repeat step 2 until the scale line is aligned with the left shell of the auxiliary receiver.

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