CN-121973939-A - Split type connection structure of engine thrust joint and torque installation section

CN121973939ACN 121973939 ACN121973939 ACN 121973939ACN-121973939-A

Abstract

The application belongs to the technical field of aeroengine mounting structure design, in particular to a split type connecting structure of an engine thrust joint and a torque mounting section, and particularly relates to a split type design for completely decoupling an engine thrust transmission function, a torque and a torque balance function in structure. The thrust transmission function and the torque balance function are completely separated, the problems of complex load path, large structural weight, poor maintainability and the like of a rear mounting section of a traditional integrated engine are solved, and the integrated engine has the advantages of clear force transmission path, optimized structure, weight reduction, convenience in maintenance, high reliability and the like, and is particularly suitable for mounting a modern large-bypass-ratio turbofan engine.

Inventors

MENG FANLI
MENG LIHUA
LV GUOCHENG
Mao Leikai
DU HONGYU
Luo Guijian
WANG HUAN

Assignees

中航沈飞民用飞机有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260401

Claims (8)

1. A split type connecting structure of an engine thrust joint and a torque installation joint is characterized in that, The split type connecting structure is used for connecting the hanging main body (1) and the engine main body (2); including a thrust transfer system and a torque balancing system; The thrust transmission system consists of an engine thrust joint (3), a thrust rod lug connecting plate (4), a thrust rod (5), a first bolt and knuckle bearing combination (6-1) and a bolt and nut combination (7); the torque balancing system consists of a second bolt and joint bearing combination (6-2), a hanging side joint (8), a torque lug connecting plate (9), a torque installation joint (10) and a tensile bolt (11).
2. The split junction structure of an engine thrust joint and a torque mounting joint according to claim 1, wherein, The thrust rod (5) is connected with the thrust rod lug connecting plate (4) through a first bolt and joint bearing combination (6-1), the thrust rod lug connecting plate (4) is connected with the engine thrust joint (3) through a bolt and nut combination (7), and the engine thrust joint (3) is fixedly connected with the hanging main body (1) through a fastener to form an independent thrust transmission path, and is mainly used for transmitting axial thrust of an engine.
3. The split-type connection structure of an engine thrust joint and a torque mounting joint according to claim 2, wherein, One or two thrust rods (5) are arranged; the shape and the size of the thrust rod lug connecting plate (4) are adjusted according to actual requirements.
4. A split engine thrust joint and torque mounting joint connection as defined in claim 3, The torque mounting joint (10) and the hanging side joint (8) are fixedly connected to the hanging main body (1), the torque mounting joint (10), the hanging side joint (8) and the hanging main body (1) are connected through the tensile bolt (11), and the torque mounting joint (10) is connected with the engine main body (2) through the torque lug connecting plate (9), the second bolt and the joint bearing combination (6-2) to form an independent torque transmission path for bearing and balancing torque and side load generated by engine torque.
5. The split engine thrust joint and torque mounting joint connection of claim 4, wherein, The shape and the size of the torque lug connecting plate (9) are adjusted according to actual requirements.
6. The split junction structure of an engine thrust joint and a torque mounting joint according to claim 5, wherein, The thrust and torque balance systems are physically decoupled from each other and from the load path without a rigid connection therebetween.
7. The split junction structure of an engine thrust joint and a torque mounting joint according to claim 6, wherein, The first bolt and knuckle bearing combination (6-1) and the second bolt and knuckle bearing combination (6-2) are composed of bolts (12), nuts (13) and knuckle bearings, wherein each knuckle bearing comprises a knuckle bearing inner ring (14) and a knuckle bearing outer ring (15); The knuckle bearing inner ring (14) is contacted with the bolt (12); in the first bolt and knuckle bearing combination (6-1), a knuckle bearing outer ring (15) is contacted with a thrust rod lug connecting plate (4); in the second bolt and knuckle bearing combination (6-2), the knuckle bearing outer race (15) is in contact with the torque tab connection plate (9).
8. The split junction structure of an engine thrust joint and a torque mounting joint according to claim 7, wherein, The length of the thrust rod (5) is adjustable, and the thrust rod (5) consists of a thrust rod main body (16), an internal thread pipe (17) and a thrust rod lug type end head (18); The thrust rod main body (16) is made of carbon fiber composite materials, inner threaded pipes (17) with two ends pressed into titanium alloy form a thrust rod inner threaded tubular end structure, and the thrust rod lug type end (18) is made into an outer thread by adopting a titanium alloy machine and can be in threaded connection with the thrust rod inner threaded tubular end structure.

Description

Split type connection structure of engine thrust joint and torque installation section Technical Field The application belongs to the technical field of aeroengine mounting structure design, in particular to a split type connecting structure of an engine thrust joint and a torque mounting section, and particularly relates to a split type design for completely decoupling an engine thrust transmission function, a torque and a torque balance function in structure. Background In an active aircraft, the engine is connected to the wing by a pylon, the connection of which must be capable of transmitting the great thrust, gravity, inertial and aerodynamic loads of the engine, while accommodating the relative displacement between the engine and the pylon due to thermal expansion. Conventional engine rear mounting sections often employ an integrated or semi-integrated design in which the thrust transmission path and torque reaction path are implemented by a compact, structurally coupled main engine rear mounting section. This conventional design has inherent limitations: 1. the load path coupling and the stress are complex, namely the thrust and the torque load are transmitted on the same main structure, so that a complex composite stress state is caused, the accurate analysis is difficult, and fatigue cracks are easy to initiate at a stress concentration point. 2. Design compromises and weight penalties-a single structure needs to meet both thrust and torque demanding requirements, often resulting in "overstock," i.e., increasing the overall weight to meet local high strength or stiffness requirements, which is detrimental to aircraft weight loss. 3. The maintenance performance is poor, when the integrated structure is overhauled and replaced, the whole rear mounting section is often required to be taken as a whole or a main component for dismounting, the process is complex, and the time and the labor are consumed. 4. The integrated structure is sensitive to manufacturing and assembly errors, the compact integrated structure has extremely high requirements on the machining precision and the assembly precision of parts, and small errors can lead to assembly stress and abnormal stress of the parts, so that the service life of the structure is influenced. 5. The lack of modularity and upgrade flexibility-any improvement to the thrust or torque transfer system may lead to a full body, requiring redesign of the entire connection structure. Disclosure of Invention In order to solve the problems caused by functional integration of the rear mounting section of the engine in the prior art, the application provides a connecting structure for completely and separately designing an engine thrust joint and a torque mounting section of an aeroengine. The design aims at realizing physical separation and function singleization of a load path, thereby achieving the aims of optimizing the structure, reducing the weight, improving the maintainability and enhancing the reliability. According to one aspect of the present application, there is provided a split type connection structure of an engine thrust joint and a torque mounting joint for connecting a hanger main body with an engine main body. Including a thrust transmitting system and a torque balancing system. The thrust transmission system consists of an engine thrust joint, a thrust rod lug connecting plate, a thrust rod, a bolt and joint bearing combination and a bolt and nut combination. The torque balance system consists of a second bolt and joint bearing combination, a hanging side joint, a torque lug connecting plate, a torque installation joint and a tensile bolt. The thrust rod is connected with a thrust rod lug connecting plate through a first bolt and joint bearing combination, the thrust rod lug connecting plate is connected with an engine thrust joint through a bolt and nut combination, and the engine thrust joint is fixedly connected with a hanging main body through a fastener to form an independent thrust transmission path and is mainly used for transmitting axial thrust of an engine. The number of the thrust rods is one or two. The shape and the size of the thrust rod lug connecting plate are adjusted according to actual requirements. The torque installation section and the hanging side joint are fixedly connected to the hanging main body, the torque installation section, the hanging side joint and the hanging main body are connected through tensile bolts, and the torque installation section is connected with the engine main body through a torque lug connecting plate, a second bolt and a joint bearing combination to form an independent torque transmission path and is used for bearing and balancing torque and side load generated by engine torque. The shape and the size of the torque lug connecting plate are adjusted according to actual requirements. The function and the structure are decoupled, namely the thrust transmission system and the torque balance system are c