Throttle Device Coil Spring Blocking Structure
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Solution Overview
Problem
Existing throttle devices for vehicles face issues with coil springs being attached incorrectly due to eccentricity, leading to impaired functionality and increased risk of the spring being fitted outside the outer periphery supporting portion during assembly.
Innovation Solution
The throttle device incorporates a blocking structure with an inner inclined surface and outer periphery supporting portion to prevent the coil spring from being fitted incorrectly, ensuring it is attached at the correct position and maintaining its intended functionality by supporting both the inner and outer peripheral sides of the spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an outer periphery supporting portion is provided in the gear to prevent coil spring eccentricity, then the coil spring stability is improved, but the coil spring may be accidentally attached to the outside of the outer periphery supporting portion during assembly
Solution Approach 1:
The blocking structure is designed with an asymmetric profile that does not match the coil spring's geometry, allowing the spring to be correctly positioned on the inner side of the blocking structure during assembly. The blocking structure's shape prevents incorrect placement by physically blocking access to the outer side of the outer periphery supporting portion.
Solution Approach 2:
The blocking structure acts as an intermediary element between the coil spring and the outer periphery supporting portion. It guides the coil spring to the correct position during assembly and prevents it from being placed incorrectly on the outer side of the outer periphery supporting portion.
2Force
If the coil spring is mounted between the final gear and the body, then the throttle valve can be biased toward the default position, but significant eccentricity occurs at some parts of the coil spring loops
Solution Approach 1:
The outer periphery supporting portion provides localized support at specific points on the outer periphery of the coil spring, preventing eccentricity at those critical locations while maintaining the overall biasing function of the spring. The blocking structure similarly provides localized guidance at the assembly interface.
Solution Approach 2:
The outer periphery supporting portion and blocking structure are pre-positioned on the gear before the coil spring is installed. This preliminary arrangement ensures that when the coil spring is mounted, it is automatically guided to the correct position and prevented from becoming eccentric during the assembly process.
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 configuration effectively prevents incorrect attachment of the coil spring, maintaining the integrity of the outer periphery supporting portion's function and reducing eccentricity, thereby ensuring proper operation and reducing friction and load on the motor, allowing for downsizing of the throttle device.
Implementation Method 1
a coil spring interposed between the throttle body and the rotating member to bias the throttle valve toward a default position
Implementation Method 2
The inner periphery supporting portion is configured to support an inner peripheral side of the first spring portion
Implementation Method 3
The outer periphery supporting portion is configured to support an outer peripheral side of the first spring portion
Implementation Method 4
The rotating member has a blocking structure that prevents the first spring portion from being fitted into the outside of the outer periphery supporting portion when assembling the coil spring
Data Source
AI summary
A throttle device includes a rotating member coupled to a throttle shaft and rotated by a drive source, and a coil spring interposed between a throttle body and the rotating member and configured to bias the throttle valve toward a default position. The coil spring has a first spring portion, a second spring portion, and an intermediate hook portion for connecting the first spring portion and the second spring portion. The rotating member includes an inner periphery supporting portion that supports an inner peripheral side of the first spring portion, an outer periphery supporting portion that supports an outer peripheral side of the first spring portion, and a blocking structure for preventing the first spring portion from being fitted to an outside of the outer periphery supporting portion when assembling the coil spring.