Throttle Valve Spring Guide Hook for Stable Intermediate Opening
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Solution Overview
Problem
In electronic throttle devices, manufacturing variations can cause mismatched widths of body and valve gear hooks, leading to unstable valve intermediate open positions, which may hinder running in limp home mode due to lack of contact between resin guides and hooks.
Innovation Solution
The throttle valve device incorporates a first guide with a protruding hook and a deformable design that can contact either the body hook or valve gear hook, ensuring stable valve positioning by absorbing errors through deformation, and includes a second guide for secure coil spring attachment, reducing assembly complexity and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid guide hooks are used to contact body and valve gear hooks, then manufacturing precision requirements increase, but assembly complexity and weight increase
Solution Approach 1:
The guide hook is designed with deformable characteristics, changing its physical state from rigid to flexible. This allows the hook to adapt its shape through elastic deformation to match variations in hook widths between body and valve gear components, eliminating the need for high manufacturing precision while reducing assembly complexity
Solution Approach 2:
The guide hook transitions from a static rigid structure to a dynamic flexible structure that can deform elastically. This dynamic capability allows the hook to automatically adjust its position and shape during assembly and operation, compensating for manufacturing variations without requiring complex assembly procedures
2Reliability
If deformable guide hook is used to absorb manufacturing errors, then contact stability improves, but structural strength decreases
Solution Approach 1:
The guide hook's material parameters are optimized to exhibit elastic deformation characteristics within specific stress ranges. The hook is designed to deform flexibly under normal operating loads to absorb manufacturing errors, while maintaining sufficient structural strength to withstand peak loads and prevent failure
Solution Approach 2:
The deformable guide hook acts as a cushioning element that anticipates and absorbs manufacturing variations before they cause contact instability. The elastic deformation capacity provides a buffer zone that compensates for width mismatches between components, ensuring stable contact without compromising the hook's load-bearing capability
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 design stabilizes the valve intermediate open position, ensuring consistent operation and preventing hindrances to limp home mode by eliminating or reducing positional errors and assembly complexities, thereby maintaining stable valve opening degrees.
Implementation Method 1
The coil spring is arranged in the body between the valve gear and the valve and generates a spring force as an opposing force when rotation is transmitted from the motor to the shaft
Implementation Method 2
The first guide hook is deformable toward one of hooks: the body hook and the valve gear hook, by receiving the spring force of the coil spring at the protrusion as an effort while a fulcrum is at a contact between the first guide hook and another of the hooks
Data Source
AI summary
A throttle valve device includes a coil spring arranged in a body between a valve gear and a valve and having a spring end extending radially outward. A first guide covers an end of the coil spring and includes a first guide hook that contacts the spring end. A body hook in the body is capable of contacting a tip end part of the first guide hook. A valve gear hook in the valve gear is capable of contacting a base end part of the first guide hook. The first guide hook has a protrusion protruding toward the spring end between the tip end part and the base end part. The first guide hook is deformable by receiving the spring force at the protrusion as an effort while a fulcrum is at a contact between the first guide hook and the body hook or the valve gear hook.