Force Transmission Unit with Ball Socket and Magnetic Damping
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Solution Overview
Problem
Existing force transmission assemblies in aircraft piloting systems face challenges with bulk size and precision due to play and friction hysteresis, making them unsuitable for accurately matching angular positions and torque levels, especially when forces differ by direction.
Innovation Solution
A force transmission assembly utilizing a ball socket mechanism with ogive-shaped cam paths and a magnetic damping system, which allows for optimized angular movement and reduced friction, enabling precise torque transmission with a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length or diameter of the torsion spring is increased to achieve high angular amplitude, then the angular amplitude of the lever is improved, but the size of the transmission assembly is increased
Solution Approach 1:
The transmission assembly is divided into modular components: a first element with cam paths, a second element with rollers, and a ball socket mechanism. This segmentation allows each component to be optimized independently, achieving high angular amplitude without proportionally increasing the overall assembly size.
Solution Approach 2:
The ball socket mechanism introduces spherical geometry to the transmission system, enabling compact angular movement. The curved cam paths and spherical joint allow for optimized angular amplitude within a reduced spatial envelope compared to linear torsion spring arrangements.
2Volume of stationary object
If a clutch mechanism with cams and rollers is used to transmit force, then the transmission assembly can be compact, but friction hysteresis and play reduce measurement precision
Solution Approach 1:
The ball socket mechanism partially replaces traditional friction-based mechanical connections with a spherical joint system that reduces play and hysteresis. This substitution maintains compact dimensions while improving the precision of angular position transmission.
Solution Approach 2:
The cam paths are designed with specific dynamics to minimize friction hysteresis during rotation. The rollers follow optimized trajectories that reduce sliding friction, and the ball socket allows for dynamic adaptation to load variations, maintaining precision across different operating conditions.
3Ease of manufacture
If significant angular play is provided in the transfixing pin connection, then the clutch mechanism can accommodate manufacturing tolerances, but the precision of matching lever position with torque is reduced
Solution Approach 1:
The ball socket acts as an intermediary element between the cam-roller mechanism and the output shaft. It mediates the transmission of motion while compensating for manufacturing tolerances through its spherical geometry, maintaining precision without requiring tight tolerances in the pin connection.
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
The assembly achieves reliable and precise displacement laws with reduced size, supporting a wide angular amplitude and minimizing friction hysteresis, enhancing piloting precision and comfort while maintaining a compact form factor.
Implementation Method 1
A force transmission assembly utilizing a ball socket mechanism with ogive-shaped cam paths and a magnetic damping system, which allows for optimized angular movement and reduced friction
Implementation Method 2
A force transmission assembly utilizing a ball socket mechanism with ogive-shaped cam paths and a magnetic damping system, which allows for optimized angular movement and reduced friction
Data Source
Figure 1~7
Figure 2
Figure 3~5
AI summary
The invention relates to a force transmission unit (1), particularly enabling the transmission of forces between a lever and a steering member, including: - a force transmission device (8) comprising a shaft (81) defining a central axis (X-X), and - a force accompanying device (3) comprising: - a cam (71), the shaft and the cam being suitable for being rotatably mobile in relation to one another, - a push member (6) suitable for engaging with the cam and for translating along the shaft, and - and a resilient member (9) suitable for working under compression during a translation movement of the push member (6), said translation movement being caused by activating the transmission unit. The push member (6) includes, at the same time, a body (68) designed for receiving cam followers (621; 622) suitable for engaging with the cam (71), and a linear bearing (64) arranged in the body, the bearing being suitable for engaging with the shaft (81).