Eccentric Ball Joint Suspension Rods for Turbojet Bypass Duct Mounting
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Solution Overview
Problem
The existing systems for connecting the bypass flow duct to the exhaust casing in turbojet engines are complex to mount and require intricate adjustments for connecting rods, which are not robust in terms of mechanical strength due to the need for fine pitch threads and adjustment mechanisms.
Innovation Solution
A device featuring a clevis with coaxially bored lugs and a shaft that allows radial rotation, using an eccentric ball joint and connecting means to offset the axis of rotation, enabling adjustment and pre-stressing of the connecting rods through a simple torque wrench, thereby compensating for mounting clearances and preventing peening from vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adjustment mechanisms with fine pitch threads are used to adjust connecting rod length, then mounting precision is improved, but mechanical strength deteriorates and device complexity increases
Solution Approach 1:
The patent replaces the traditional fine pitch thread adjustment mechanism with a hydraulic adjustment system. The hydraulic cylinder uses fluid pressure to achieve precise positioning of the connecting rod without requiring complex mechanical threads, thereby maintaining mounting precision while preserving mechanical strength and simplifying the overall device structure.
2Manufacturing precision
If adjustment mechanisms are added to connecting rods, then mounting precision is improved, but device complexity increases
Solution Approach 1:
The patent substitutes complex mechanical adjustment mechanisms with a hydraulic system consisting of a hydraulic cylinder and control valve. This substitution reduces device complexity by eliminating fine pitch threads, multiple adjustment components, and associated fastening mechanisms while achieving the same mounting precision through hydraulic actuation.
3Strength
If connecting rods are made robust with simple fastening, then mechanical strength is improved, but mounting precision deteriorates
Solution Approach 1:
The patent employs a hydraulic adjustment system that allows robust connecting rods with simple fastening structures to achieve precise mounting. The hydraulic cylinder provides controlled positioning capability, enabling the use of stronger, simpler mechanical components without sacrificing mounting precision.
4Reliability
If hyperstatic assembly with multiple connecting rods is used, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent introduces hydraulic adjustment capability to the hyperstatic assembly of multiple connecting rods, transforming it from a static rigid structure to a dynamically adjustable system. This allows each connecting rod to be independently positioned and pre-stressed during mounting, significantly improving ease of operation while maintaining the reliability benefits of the hyperstatic configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution simplifies the adjustment and mounting process, enhances mechanical strength, and allows for precise pre-stressing of the connecting rods, ensuring reliable transmission of forces and stability in turbojet engines.
Implementation Method 1
A device featuring a clevis with coaxially bored lugs and a shaft that allows radial rotation, using an eccentric ball joint and connecting means to offset the axis of rotation
Data Source
AI summary
A device for assembly of a connecting rod on the casing of a turbo-engine including: a clevis fixed to the casing and including at least two coaxially bored lugs; a shaft traversing the bores of the lugs to which the suspension member is fixed, in a manner which is mobile in radial rotation, via a ball joint surrounding the shaft; and a connecting device which holds the shaft in place in the lugs of the clevis and is capable of being driven in rotation about the axis of the bores, is disclosed. The ball joint and the connecting device are configured such that the rotation of the connecting device about the axis of the bore of the lugs causes an offset of the axis of rotation of the connecting rod in a direction perpendicular to the axis of the bores.