3-DOF Angular Motion Apparatus Eliminates Roll Restriction Link
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Solution Overview
Problem
Existing rocket motor nozzle systems require complex assembly processes and increased manufacturing costs due to the need for a roll-rotation restricting link to control 3-degree of freedom angular motion, which complicates the assembly and increases the number of components.
Innovation Solution
An apparatus with a pitch axis driving unit and a yaw axis driving unit that restricts the body from rotating around the roll axis, using a pitch axis cylinder, piston, and connecting rod, along with a yaw axis cylinder, piston, and connecting rod, to achieve 3-degree of freedom angular motion without the need for a conventional roll-rotation restricting link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a roll-rotation restricting link is installed between the fixing part and nozzle to restrict rotation around the roll axis, then the angular motion control is improved, but the assembly process becomes more complicated and the number of components increases
Solution Approach 1:
The pitch axis driving unit and yaw axis driving unit are merged into a single integrated structure that simultaneously provides both driving functions and roll-axis restriction. The connecting rods of both driving units work together to form a mechanical constraint system that eliminates the need for a separate roll-rotation restricting link, thereby simplifying the overall assembly process while maintaining reliable angular motion control.
Solution Approach 2:
The pitch axis driving unit and yaw axis driving unit are designed to perform multiple functions: they not only drive rotation around their respective axes but also collectively restrict rotation around the roll axis. This multi-functionality eliminates the need for dedicated roll restriction components, reducing the total number of parts and simplifying assembly.
2Reliability
If a roll-rotation restricting link is installed to restrict rotation around the roll axis, then the angular motion control is improved, but the manufacturing cost increases due to increased number of components
Solution Approach 1:
The pitch axis driving unit and yaw axis driving unit are merged into a single integrated structure that simultaneously provides both driving functions and roll-axis restriction. The connecting rods of both driving units work together to form a mechanical constraint system that eliminates the need for a separate roll-rotation restricting link, thereby simplifying the overall assembly process while maintaining reliable angular motion control.
Solution Approach 2:
The pitch axis driving unit and yaw axis driving unit are designed to perform multiple functions: they not only drive rotation around their respective axes but also collectively restrict rotation around the roll axis. This multi-functionality eliminates the need for dedicated roll restriction components, reducing the total number of parts and simplifying assembly.
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
Simplifies the assembly process, reduces the number of components, and decreases manufacturing costs by allowing 3-degree of freedom angular motion while restricting rotation around the roll axis, thus eliminating the need for a roll-rotation restricting link.
Implementation Method 1
a pitch axis piston reciprocatingly disposed at the pitch axis cylinder
Implementation Method 2
a yaw axis piston reciprocatingly disposed at the yaw axis cylinder
Implementation Method 3
another end connected to the pitch axis piston by a ball joint
Data Source
AI summary
An apparatus for driving a body with 3-degree of freedom angular motion, comprises: a body connected to a fixing part so as to be rotatable centering around a pitch axis, a yaw axis, and a roll axis; a pitch axis driving unit for rotating the body centering around the pitch axis; and a yaw axis driving unit for rotating the body centering around the yaw axis. Since one of the pitch axis driving unit and the yaw axis driving unit restricts the body from rotating centering around the roll axis fixed to the body, the conventional roll-rotation restricting link is not needed between the body and the fixing part. Accordingly, a size of the apparatus is reduced.