Bidirectional Throttle Grip Rattling Prevention via Dual-Role Spring
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Solution Overview
Problem
Existing throttle grip devices experience rattling issues between the throttle grip and interlocking member due to engagement, which is difficult to prevent without increasing the number of urging units, thereby raising manufacturing costs.
Innovation Solution
A throttle grip device with a pressing unit that uses the urging force of the second urging unit to press the engaging portion against the engaged portion when the throttle grip is in the initial position, reducing rattling by integrating the second urging unit's function with rattling prevention, and selectively applying urging forces based on rotation direction using a torsion coil spring and coil springs for normal and reversed rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engaging portion of the throttle grip is engaged with the engaged portion of the interlocking member, then the interlocking member is interlocked and rotated in conjunction with the throttle grip, but rattling is likely to occur between the throttle grip and the interlocking member
Solution Approach 1:
The patent merges the function of the second urging unit with the rattling prevention function by having it perform dual roles: urging the interlocking member toward the initial position during reversed rotation and pressing the engaging portion against the engaged portion to prevent rattling. This integration eliminates the need for a separate rattling prevention mechanism while maintaining both functions effectively.
Solution Approach 2:
The second urging unit is designed with multi-functionality, serving both as an urging mechanism for reversed rotation and as a rattling prevention device. By making this component universal, the patent reduces the total number of parts while ensuring reliable interlocking and eliminating harmful rattling sounds.
2Object-generated harmful factors
If another urging unit separate from the first urging unit and the second urging unit is used to prevent rattling, then rattling is prevented, but the number of components is increased and manufacturing cost is increased
Solution Approach 1:
The patent combines the rattling prevention function with the existing second urging unit, eliminating the need for a separate rattling prevention mechanism. This merging of functions reduces the number of components while effectively preventing rattling between the throttle grip and interlocking member.
Solution Approach 2:
The second urging unit is designed to serve multiple purposes: urging the interlocking member toward the initial position during reversed rotation and pressing the engaging portion against the engaged portion to prevent rattling. This multi-functionality approach reduces device complexity and manufacturing cost while maintaining effective rattling prevention.
3Object-generated harmful factors
If another urging unit separate from the first urging unit and the second urging unit is used to prevent rattling, then rattling is prevented, but manufacturing cost is increased
Solution Approach 1:
The patent merges the rattling prevention function into the existing second urging unit, eliminating the need for additional components that would increase manufacturing cost. This integration maintains effective rattling prevention while simplifying the manufacturing process and reducing overall production expenses.
Solution Approach 2:
By designing the second urging unit with multi-functionality to handle both urging during reversed rotation and rattling prevention, the patent reduces the total component count, thereby lowering manufacturing cost while effectively eliminating rattling issues.
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
The solution effectively reduces rattling between the throttle grip and interlocking member without increasing the number of urging units, improving operability and stability during normal and reversed rotations, while maintaining control over engine operations and activating/deactivating vehicle functions.
Implementation Method 1
a first urging unit configured to urge the interlocking member toward an initial position when the throttle grip is subjected to the normal rotation
Implementation Method 2
a second urging unit configured to urge the interlocking member toward the initial position when the throttle grip is subjected to the reversed rotation
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A throttle grip device includes: a throttle grip; an interlocking member including an engaged portion engaged with an engaging portion formed on the throttle grip, and rotating in conjunction with the normal rotation and the reversed rotation of the throttle grip; a first urging unit configured to urge the interlocking member toward the initial position when the throttle grip is subjected to the normal rotation; a second urging unit configured to urge the interlocking member toward the initial position when the throttle grip is subjected to the reversed rotation; a rotation angle detecting unit detecting a rotation angle of the throttle grip by detecting a rotation angle of the interlocking member; and a pressing unit pressing the engaging portion against the engaged portion by an urging force of the second urging unit when the throttle grip is in the initial position.