Throttle Spring Support Structure for Lower Friction Wear
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Solution Overview
Problem
Conventional throttle devices require a guide member that increases component count and size, leading to higher costs and friction due to the reaction force against torsional torque, necessitating a more efficient design.
Innovation Solution
The throttle device omits the guide member and uses outer circumference supporting members on the throttle gear to reduce sliding friction by maintaining the first loop of the opener spring portion away from the spring guide, thereby reducing wear and motor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide member is used to support the opener spring portion, then the spring can be properly guided, but the number of components increases and the device size increases
Solution Approach 1:
The patent integrates the guidance function into the rotator structure by forming a guide groove directly on the rotator surface. This combines the guide member function with the rotator, eliminating the need for a separate guide member and reducing component count while maintaining proper spring guidance
Solution Approach 2:
The rotator is designed to serve multiple functions: it provides the rotational motion for the throttle valve, supports the opener spring portion through its guide groove, and maintains the spring's operational path. This multi-functionality eliminates the need for dedicated guide members
2Reliability
If a guide member is used to support the opener spring portion, then the spring can be properly guided, but the device size increases
Solution Approach 1:
The guide groove is formed directly on the rotator surface, merging the guidance function into the existing rotator structure. This integration eliminates the need for additional space-consuming guide members while maintaining proper spring guidance throughout operation
3Reliability
If the first loop of the opener spring portion contacts the spring guide, then the spring is supported, but sliding friction increases due to reaction force against torsional torque
Solution Approach 1:
The guide groove is designed to extend in the axial direction of the rotator, creating a three-dimensional guidance path. This dimensional approach allows the spring to be supported along its length rather than at a single point, distributing the reaction force and reducing sliding friction at any given location
4Reliability
If the first loop of the opener spring portion contacts the spring guide, then the spring is supported, but wear increases due to sliding friction
Solution Approach 1:
The axial extension of the guide groove distributes the support function along the spring's length, reducing the concentration of wear at any single point. This dimensional distribution extends the operational life of both the spring and the rotator by minimizing wear accumulation
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 reduces the number of components, decreases size and cost, and minimizes sliding friction between the opener spring portion and the spring guide, enhancing the throttle device's efficiency and durability.
Implementation Method 1
a coil spring arranged between the throttle body and the rotator. The coil spring includes a return spring portion consisting of a coil wound in a first direction, an opener spring portion consisting of a coil wound in a second direction that is opposite to the first direction
Implementation Method 2
the outer circumference supporting member of the rotator contacts the outer circumference of the first loop of the opener spring portion of the coil spring on the intermediate hook portion side, and thus, the first loop is spaced away from the spring guide of the rotator. Accordingly, sliding friction generated between at least the first loop of the opener spring portion on the intermediate hook portion side and the spring guide member of the rotator may be reduced
Data Source
AI summary
A throttle device comprises a throttle body, a throttle gear, and a coil spring. The coil spring comprises an intermediate hook part, a return spring part that is wound in one direction from the intermediate hook part, and an opener spring part that is wound in the opposite direction from the intermediate hook part. A gear-side end part of the opener spring part is connected to the throttle gear. The throttle gear comprises a spring guide part that holds the inner circumferential side of the opener spring part. The throttle gear comprises an outer circumferential support part that abuts the outer circumferential side of the first turn of the opener spring part on the intermediate hook part side.