CN206511131U - The structure for being easy to engine to be installed with engine mount - Google Patents

Abstract

The utility model discloses a structure which facilitates the installation of the engine and the engine frame. The engine frame is provided with n mounting holes, wherein n>4, and the n mounting holes are equal in shape and size, and the mounting joints are provided with Mounting holes 2, which are equal in number and in one-to-one correspondence with the mounting holes of the engine frame, are fitted with fixing bolts between each one-to-one corresponding mounting hole 1 and mounting hole 2, and are respectively embedded in each mounting hole 1 of the engine frame. An eccentric bushing, there is a gap between the eccentric bushing and the mounting hole 1, the length of the eccentric bushing is at least greater than the thickness of the base of the engine frame mounting hole 1, the outer diameter of each eccentric bushing is the same but the eccentricity is different. The new model improves the connection precision between the engine and the engine frame, simplifies the assembly process of the engine and the engine frame, reduces the technical requirements for the operators in the assembly of the engine and the engine frame, improves the qualified rate of assembly, and saves costs.

Description

Structure for easy engine and engine mount installation

technical field

The utility model relates to an aircraft engine installation accessory, in particular to a structure for facilitating the installation of the engine and the engine frame.

Background technique

At present, the engines of most small general-purpose aircraft are connected to the fuselage through the engine mount, so the load and vibration of the engine will be transmitted to the engine mount first. The connection between the engine and the engine frame plays a key role in the transmission of load and vibration. Therefore, the connection between the engine and the engine frame is required to be very accurate and reliable. However, at present, most engines are connected to the mounting section, and the mounting section and the engine frame are connected by bolts. In order to ensure that the load and vibration of the engine are smoothly transmitted to the engine frame, the 8 holes (1', 2', ... 8') on the mounting section and the 8 holes (1, 2, ... 8') on the engine frame need to be connected. ...8) One-to-one correspondence, accurate and reliable, so the dimensions on the engine frame (L1, L2, ... L8) are required to be equal to the corresponding dimensions on the mounting joints (L1', L2', ... L8'), That is (L1=L1', L2=L2', ... L8=L8'). This requirement is very demanding, but necessary.

The current common method is: first, install the engine frame without processing 8 holes (1, 2, ... 8) on the ground tooling, and install the mounting section on the corresponding mounting lug of the engine. Then use a crane to lift the engine to correct the relative position of the engine and the engine frame to meet the position requirements of the engine and the engine frame. Then try to assemble the engine frame with the engine, and use special tooling to make projection marks on the 8 holes (1', 2', ... 8') of the mounting section on the engine frame. Then use special tooling to drill holes (1, 2, ... 8) at the marks on the engine frame to ensure the direction, size and position of the holes. Finally, use bolts to fix the mounting section on the engine frame, thus completing the connection between the engine and the engine frame.

However, since machining tolerances are unavoidable, the 8 holes (1', 2', ... 8') of each engine mounting section are not exactly the same. Then using this method of installation requires the installation of each engine to go through the processes of lifting, straightening, trial assembly, marking, drilling, and installation, and in order to ensure the necessary accuracy requirements, a variety of special tooling and advanced equipment are also required. Technicians can do it. This kind of process has a large number and depends on the level of the operator, so the risk of processing errors will be relatively high, especially if the position or direction of the drilling is deviated, the engine load and vibration will not be effectively transmitted to the engine frame if it is light, and the heavy Then lead to the rework or scrapping of the engine frame, which is not conducive to mass production, cannot achieve higher precision, and cannot save resources and control costs.

Utility model content

The purpose of this utility model is to provide a new structure for facilitating the installation of the engine and the engine frame, which can achieve the installation accuracy Simultaneously simplify the engine installation process, improve the assembly qualification rate, and save costs.

In order to realize the purpose of the utility model, the technical solution adopted in the utility model is: a structure that facilitates the installation of the engine and the engine frame, and the engine frame is provided with n mounting holes one, and the mounting holes one corresponds to a mounting hole one base, Said n>4, the shape and size of the n mounting holes are equal, and there are two mounting holes that are equal in number and position one-to-one to the engine frame mounting holes on the mounting joint, and the mounting holes are corresponding to the mounting holes. There are fixed bolts matched between each one-to-one corresponding mounting hole 1 and mounting hole 2, and an eccentric bushing is respectively embedded in each engine frame mounting hole 1, leaving a gap between the eccentric bushing and mounting hole 1. There is a gap, the length of the eccentric bushing is at least greater than the thickness of the engine frame mounting hole-base, and the outer diameter of each eccentric bushing is the same but the eccentricity is different.

Based on the above technical solution, gaskets are respectively installed at the lower end of the first base of the mounting hole of each engine frame and the upper end of the second base of the mounting hole of the mounting section.

Based on the above technical solution, the n is 8.

Based on the above technical solution, the length of the eccentric bushing is 0.5-1mm greater than the thickness of the engine mount mounting hole-base.

The utility model has the following beneficial effects: 1. Improve the connection precision of the engine and the engine frame; 2. Simplify the assembly process of the engine and the engine frame; Pass rate, cost saving.

Description of drawings

Figure 1 is a schematic diagram of the overall assembly of the engine, mounting section and engine frame;

Fig. 2 is one of the schematic diagrams of the connection between the installation section and the engine frame in the prior art;

Fig. 3 is the second schematic diagram of the connection between the mounting section and the engine frame in the prior art;

Fig. 4 is a schematic diagram of the overall structure of the utility model to facilitate the installation of the engine and the engine frame;

Fig. 5 is a schematic diagram of the structure of the mounting hole of the engine frame of the utility model after the bushing is assembled;

Fig. 6 is a schematic diagram of the assembly of the second installation hole of the installation section of the utility model and the first installation hole of the engine;

Fig. 7 is a schematic diagram of the structure of the eccentric bush before rotation of the utility model;

Fig. 8 is a structural schematic diagram of the eccentric bushing of the utility model after rotation.

Symbols in the figure: 1-engine, 2-installation section, 3-engine frame, 4-installation hole 1, 5-installation hole 2, 6-installation hole 1 base, 7-installation hole 2 base, 8-eccentric lining Set, 9-bolts, 10-washers, 11-locknuts.

detailed description

The utility model will be further described below in combination with specific embodiments, so as to better understand the technical solution of the utility model.

Embodiment 1: A kind of structure that facilitates the installation of engine and engine frame, referring to Fig. 4-Fig. One corresponds to a mounting hole-base 6, and the mounting joint is provided with mounting holes 2 5 equal in number to the engine rack mounting holes and corresponding in position one to one, between each one-to-one corresponding mounting hole 1 and mounting hole 2 Bolts 9 are provided for matching between them, and an eccentric bushing 8 is respectively embedded in each engine frame mounting hole 1. There is a gap between the eccentric bushing 8 and the mounting hole 4, and the length of the eccentric bushing is at least greater than that of the engine frame mounting hole 1. Base thickness, each eccentric bushing has the same outer diameter but different eccentricities. Pads 10 are respectively installed at the lower end of the first base of each engine mount mounting hole and the upper end of the second base of the mounting hole of the mounting section.

According to the assembly requirements of the engine, this embodiment can meet the installation requirements (L1=L1', L2=L2', ... L8=L8') and simplify process.

The specific principle is: the eccentric bush and the hole of the engine frame are fitted with a very small gap, and the bush can rotate in the hole. When installing the engine, if L2≠L2', then turn the eccentric bushings of bore 2 and bore 3. Due to eccentricity, L2 will change to L2±Δ after the bush rotates at different angles. As long as Δ is large enough, L2±Δ=L2' can be guaranteed, that is, L2=L2' after adjustment. By analogy, L1=L1', L2=L2', ... L8=L8' can be satisfied.

When the eccentric bushing is processed, its length is slightly greater than the thickness of the engine frame mounting hole-base. When assembling, one end of the eccentric bush is in contact with the second base of the mounting hole of the mounting section, and the other end is lower than the base of the first mounting hole of the engine frame by X mm, X is preferably 0.5-1mm, and it is in contact with the gasket. When the bolt is tightened, the nut will Compress the bushing to create friction that stops the bushing from rotating, and the bushing is in place.

The specific process of connecting the engine to the engine frame is as follows: first, when processing the engine frame, expand the 8 holes on the engine frame to a certain size, and machining can ensure the size and direction of the holes; Eccentric bushings with different eccentricities, insert the bushings into 8 holes on the engine frame. Then lift the engine to the top of the engine frame, and use bolts to connect the mounting section and the engine frame. Then, if the bolt does not pass smoothly from the hole in the mounting section to the hole in the engine mount, rotate the eccentric bushing until the bolt can pass freely. Finally use the nut to compress the bushing so that it can no longer rotate freely and the installation process is complete.

Claims (4)

1. A structure that facilitates the installation of the engine and the engine frame is characterized in that: the engine frame is provided with n mounting holes 1, and the mounting holes 1 correspond to a mounting hole 1 base, said n>4, n mounting holes Hole 1 has the same shape and size. Mounting hole 2 is provided on the mounting joint with the same number and positions as the engine frame mounting hole 1. The mounting hole 2 corresponds to the mounting hole 2 base. Mounting hole 1 and mounting hole 2 are matched with fixing bolts, and an eccentric bushing is respectively embedded in each engine frame mounting hole 1. There is a gap between the eccentric bushing and mounting hole 1. The length of the eccentric bushing At least greater than the engine mount mounting hole-base thickness, each eccentric bushing has the same outer diameter but different eccentricities. 2. The structure for facilitating the installation of the engine and the engine frame according to claim 1, characterized in that: gaskets are respectively installed at the lower end of the first base of each engine rack mounting hole and the upper end of the second base of the mounting joint. 3. The structure for facilitating the installation of the engine and the engine frame according to claim 1, characterized in that: said n is 8. 4. The structure for facilitating the installation of the engine and the engine frame according to claim 1, characterized in that: the length of the eccentric bush is 0.5-1 mm thicker than the engine frame mounting hole-base thickness.