Aero-engine accessory casing positioning tool and mounting method

Abstract

The invention relates to an aero-engine accessory casing positioning tool and a mounting method, and solves the problem that the engine accessory casing is not completely restrained in the mounting process, so that the whole accessory casing shakes, and accurate positioning cannot be achieved in the assembling process. Comprising a positioning plate, a positioning pin, a positioning shaft sleeve, a hoop assembly and a pin, the positioning pin is installed on the positioning plate, the size of the exposed part of the positioning pin is matched with that of a flying attachment hanging connector, the axis of the positioning shaft sleeve is fixed to the relative position and size of the positioning pin, one end of the positioning shaft sleeve is connected with the positioning plate through an interference spigot and a bolt, and the pin is installed at the other end of the positioning shaft sleeve. The axis of the pin and the positioning pin are fixed in relative position and size, the pin is used for being matched with a positioning groove in the flying attachment casing, the positioning shaft sleeve is in seam allowance fit with the butting position of the flying attachment casing, and axial enclasping is carried out through the hoop assembly. Accurate and rapid positioning and installation of the accessory casing are achieved, abrasion faults of the transmission rod caused by deflection of the position of the accessory casing are reduced, the weight is light, and carrying is convenient.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine assembly technology, specifically relating to an aero-engine accessory housing positioning fixture and installation method. Background Technology

[0002] During the installation of a certain type of engine accessory housing, it was not fully constrained, causing the entire accessory housing to shake and making it impossible to install guide tubes on it. At the same time, when the accessory housing is installed on the aircraft, it needs to be docked with the aircraft accessory housing to transmit power through the drive shaft. Due to the uncertain position of the accessory housing, there is a deviation when docking with the aircraft accessory housing, which leads to uneven wear and failure of the drive shaft during engine operation. Summary of the Invention

[0003] This invention provides a positioning fixture and installation method for an aero-engine accessory housing, which solves the problem of inaccurate positioning during assembly caused by the overall shaking of the accessory housing due to incomplete constraint during installation.

[0004] The technical solution of this invention is: A positioning fixture for an aircraft engine accessory housing includes a positioning plate 1, a positioning pin 2, a positioning bushing 3, a clamp assembly 4, a pin 5, and a fixing mechanism. The positioning pin 2 is mounted on the positioning plate 1, and its exposed portion matches the dimensions of the aircraft attachment interface. The head of the positioning pin has a 30° chamfer for guidance, facilitating insertion of the positioning pin into the aircraft attachment interface.

[0005] The positioning bushing's axis and the positioning pin are fixed in relative position and size to simulate the flight casing. One end of the positioning bushing is connected to the positioning plate via an interference fit and bolts to ensure connection strength and dimensional tolerances. Simultaneously, five oblong holes are evenly distributed on the cylindrical surface of the positioning bushing to achieve a good weight reduction effect.

[0006] A rectangular handle hole is provided on the positioning plate for easy handling of the tooling. The bolts connecting the positioning plate and the positioning bushing are countersunk hexagonal socket bolts, with no protrusions on the surface after installation to avoid interference during use.

[0007] A pin is installed at the other end of the positioning bushing. The pin's axis is fixed in position and size relative to the positioning pin, and it is used to mate with the positioning groove on the flight mount housing to provide circumferential limiting. The mating point between the positioning bushing and the flight mount housing is a stop fit, which also provides circumferential limiting. At the same time, the mating point has a trapezoidal cross section, which is axially clamped by a clamping assembly.

[0008] All tooling is made of metal. The positioning plate and positioning bushing are preferably made of carbon structural steel to improve the strength of the tooling and prevent deformation during use. The positioning pins and pins are preferably made of mold steel, which has high hardness, high wear resistance and high strength, to avoid wear caused by repeated disassembly and assembly of mating parts during use.

[0009] A method for assembling and installing an aero-engine accessory housing based on the aforementioned tooling involves first inserting the positioning pin on the positioning plate into the spherical bearing of the engine attachment mounting interface, then using the stop at the other end of the positioning bushing to fit the journal on the accessory housing, aligning and locking the pin on the positioning bushing with the notch on the engine accessory housing, and finally using a clamping assembly to tighten the positioning bushing and the accessory housing, thereby achieving precise positioning and installation of the accessory housing.

[0010] This invention provides an accessory housing installation and positioning fixture that utilizes a combination of a positioning plate, positioning pins, and positioning bushings to achieve precise and rapid positioning and installation of the accessory housing. This reduces wear and tear on the transmission rod caused by misalignment of the accessory housing. Furthermore, the fixture is lightweight and easy to carry.

[0011] Through practical application, the positioning accuracy of the accessory housing after assembly can reach within 0.1°, which is greatly reduced compared to the 1.5° deviation when assembled without tooling, and has a significant effect on suppressing accessory housing failures. Attached Figure Description

[0012] Figure 1 Schematic diagram of the positioning fixture structure for the accessory housing; Figure 2 Schematic diagram of the positioning bushing; Figure 3 Schematic diagram of the installation of the positioning fixture for the accessory housing. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] like Figure 1 As shown, the accessory housing positioning fixture mainly includes a positioning plate 1, a positioning pin 2, a positioning bushing 3, and a clamp assembly 4; pins 5, the center coordinates of the positioning pin and the center coordinates of the positioning plate have a strict relative positional relationship; the circumferential angle of the pin installed on the positioning bushing also has a strict relative positional relationship with the center coordinates of the positioning pin; the perpendicularity of the positioning bushing and the positioning plate needs to be precisely controlled; the positioning bushing and the positioning plate are circumferentially positioned through positioning holes, and simultaneously assembled by cold (or hot) fitting through an interference fit; after assembly, the positioning bushing and the positioning plate are tightened with eight countersunk hexagonal socket bolts to ensure the connection rigidity and positional accuracy between the positioning plate and the positioning bushing. The other end of the positioning bushing is an inner stop, used for a small clearance fit with the stop of the engine accessory housing, and circumferentially positioned by a pin.

[0015] like Figure 3As shown, when using it, first insert the positioning pin on the positioning plate into the spherical bearing of the engine attachment mounting interface, use the stop at the other end of the positioning bushing to fit the journal on the accessory housing, align the pin on the positioning bushing with the notch on the engine accessory housing and lock it in place, and after the end face of the positioning bushing is in contact with the end face of the journal of the accessory housing, use the clamp assembly to clamp the positioning bushing and the accessory housing.

[0016] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A positioning fixture for an aircraft engine accessory housing, characterized in that: It includes a positioning plate, positioning pin, positioning bushing, clamp assembly, and pin. The positioning pin is installed on the positioning plate, and its exposed part size matches the flight attachment hanger interface. The positioning bushing axis is fixed in position and size relative to the positioning pin. One end of the positioning bushing is connected to the positioning plate through an interference fit and bolts. A pin is installed on the other end of the positioning bushing. The pin axis is fixed in position and size relative to the positioning pin and is used to mate with the positioning groove on the flight attachment housing. The positioning bushing and the flight attachment housing are mated with a stop fit and are axially clamped by the clamp assembly.

2. The positioning fixture for an aero-engine accessory housing according to claim 1, characterized in that: The head of the locating pin has a 30° chamfer.

3. The positioning fixture for an aero-engine accessory housing according to claim 1, characterized in that: The mating point between the positioning bushing and the flight casing has a trapezoidal cross section.

4. The positioning fixture for an aero-engine accessory housing according to claim 1, characterized in that: The cylindrical surface of the positioning bushing has evenly distributed weight-reducing holes.

5. The positioning fixture for an aero-engine accessory housing according to claim 4, characterized in that: The weight-reducing hole is a waist-shaped hole.

6. The positioning fixture for an aero-engine accessory housing according to claim 1, characterized in that: The positioning plate has a handle hole.

7. The positioning fixture for an aero-engine accessory housing according to claim 1, characterized in that: The bolts connecting the positioning plate and the positioning bushing are countersunk hexagonal bolts, and there are no protrusions on the surface after installation.

8. The positioning fixture for an aero-engine accessory housing according to claim 1, characterized in that: The positioning plate and positioning shaft are made of carbon structural steel.

9. A positioning fixture for an aero-engine accessory housing according to claim 1, characterized in that: The positioning pins and pins are made of mold steel.

10. A method for positioning and installing an aircraft engine accessory housing, characterized in that: Based on the tooling described in any one of claims 1-9, first insert the positioning pin on the positioning plate into the spherical bearing of the engine attachment mounting interface, use the stop at the other end of the positioning bushing to fit the journal on the accessory housing, align and lock the pin on the positioning bushing with the notch on the engine accessory housing, and use the clamping assembly to clamp the positioning bushing and the accessory housing to achieve precise positioning and installation of the accessory housing.

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