Throttle Valve Spring Guide Assembly With Jig Alignment
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Solution Overview
Problem
Existing throttle valve devices face difficulties in assembling the coil spring and guides due to the need for precise angle adjustments and risk of guides detaching during assembly, leading to challenges in attaching the coil spring to the valve gear.
Innovation Solution
A throttle valve device design featuring a coil spring with radial ends and guides that include through holes and insertion holes, allowing for easy attachment and alignment using jigs, enabling the coil spring to be securely attached to the valve gear without direct contact with the holding portion until the spring force is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If guides are arranged at opposite ends of the coil spring and spring ends are engaged with the driving portion, then the coil spring can be attached to the valve gear, but the assembly process becomes complex due to the need for precise angle adjustments and risk of guides detaching
Solution Approach 1:
A guide pin is introduced as an intermediary component to facilitate the assembly of the coil spring and guides. The guide pin fits into insertion holes provided in both guides, serving as a mediator that enables precise alignment and secure attachment during the assembly process, thereby simplifying the manufacturing procedure while maintaining assembly precision.
Solution Approach 2:
Insertion holes are pre-formed in the guides at specific positions and angles before the actual assembly of the coil spring. This preliminary preparation of the guides with insertion holes allows for easier and more accurate assembly, as the guides are already positioned and oriented correctly to receive the guide pin and coil spring ends.
2Reliability
If the coil spring is securely attached to the valve gear, then device reliability is improved, but the assembly process becomes more difficult due to precise positioning requirements
Solution Approach 1:
The traditional mechanical assembly method requiring manual positioning and alignment of the coil spring and guides is replaced by a jig-based system. The jig incorporates guide pins that automatically align with insertion holes in the guides, substituting complex manual mechanical positioning with a simpler, more reliable jig-guided assembly process that ensures precise positioning while improving ease of manufacture.
Solution Approach 2:
The guide pin acts as an intermediary that bridges the gap between the jig and the guides, ensuring accurate positioning and secure attachment of the coil spring to the valve gear. This intermediary component maintains reliability by ensuring precise alignment while simplifying the assembly process through the use of pre-formed insertion holes.
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
Facilitates easy assembly and secure attachment of the coil spring and guides to the valve gear, ensuring accurate positioning and preventing detachment, thereby improving the manufacturing process and device reliability.
Implementation Method 1
the coil spring being configured to generate a spring force as an opposing force at a time of transmission of rotation from the motor to the shaft
Data Source
AI summary
A coil spring of a throttle valve device around a shaft between a valve and a valve gear has one end rotated together with a first guide, and another end rotated together with a second guide. The both ends of the coil spring contact a holding portion and a driving portion at a valve intermediate position of the shaft. The driving portion pushes the one end of the coil spring while the holding portion holds the other end of the coil spring during movement of the shaft from the valve intermediate position toward a valve fully-open position or a valve fully-closed position. The first guide and the second guide have insertion holes that face each other in an axial direction when the both ends of the coil spring are positioned near the valve intermediate position of the shaft and are not in contact with the holding portion.