Throttle Valve Gear Spring Hook Locking Mechanism
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Solution Overview
Problem
The assembly of throttle devices is complicated due to the need to temporarily align and adjust the rotational positions of the valve gear and spring after they are housed in the body, requiring intricate steps and increasing the risk of errors and complexity.
Innovation Solution
A throttle device design where the valve gear and spring are assembled with hooks that lock into the body and valve gear, allowing for easier integration and alignment, eliminating the need for temporary assembly adjustments, and incorporating a guide to reduce sliding resistance and material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the valve gear and spring are assembled after being housed in the body, then the assembly process becomes complicated requiring temporary alignment and adjustment of rotational positions, but this approach allows for flexible assembly sequencing
Solution Approach 1:
The valve gear and spring are pre-assembled into a subassembly before being housed in the body, eliminating the need for temporary alignment and adjustment operations. This preliminary assembly action simplifies the overall manufacturing process by reducing the number of complex assembly steps required.
Solution Approach 2:
The assembly process is divided into distinct stages: first assembling the valve gear and spring into a subassembly, then housing this subassembly in the body. This segmentation of the assembly process eliminates the complexity of temporary alignment operations while maintaining manufacturing flexibility.
2Manufacturing precision
If temporary assembly adjustments are required for rotational alignment, then assembly errors increase and productivity decreases, but this ensures precise rotational positioning
Solution Approach 1:
The valve gear and spring are pre-assembled with their rotational positions already aligned during subassembly creation. This preliminary alignment action eliminates the need for subsequent temporary adjustment operations, thereby increasing assembly speed while maintaining precision.
Solution Approach 2:
The pre-assembled subassembly self-positions within the body without requiring external alignment operations. The valve gear and spring maintain their correct rotational relationship automatically, eliminating assembly errors and improving productivity.
3Ease of operation
If the valve gear and spring are assembled as a subassembly, then the assembly process is simplified and errors are reduced, but this requires additional subassembly operations
Solution Approach 1:
The assembly process is segmented into creating a valve gear-spring subassembly and then housing it in the body. This segmentation simplifies the overall operation by reducing the number of complex alignment steps, while the subassembly structure itself remains relatively simple.
Solution Approach 2:
The valve gear and spring are merged into a single subassembly unit, which simplifies the assembly operation by treating them as one component. This merging reduces the number of separate operations required while maintaining structural simplicity.
Data Source
AI summary
A valve gear includes a gear portion configured to rotate by drive torque transmitted from an actuator, a boss portion provided on the gear portion and having a cylindrical outer wall, and one or more extension portions extending in an axial direction from the gear portion on a radial outer side of the boss portion. A coiled spring including a first hook provided at end portion on a gear portion side, and a second hook provided at end portion on an opposite side to the gear portion so that the first hook and the second hook are respectively locked to each other on opposite sides in a circumferential direction of the extension portion. A valve gear subassembly formed by assembling the valve gear and the spring is housed in a valve gear accommodating chamber of the body, and the second hook of the spring is locked to the body.