Handle Weight Mounting Structure for Straddle-Type Vehicles
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Solution Overview
Problem
Existing handle weight mounting structures for straddle-type vehicles have variations in vibration isolating performance and are costly due to the complexity of components and precise machining requirements, particularly with the use of tapered-shaped nut members and multiple components.
Innovation Solution
A handle weight mounting structure that uses a fastening bolt with a shank portion and head portion to securely attach an outer weight to the handle pipe, eliminating the need for a tapered-shaped nut member, and incorporates a lock portion and rubber members to couple the outer and inner weights, reducing the number of components and machining complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tapered-shaped nut member and multiple components are used to support the handle weight, then the handle weight can be securely mounted, but the structure becomes complex and vibration isolating performance varies
Solution Approach 1:
The patent combines the functions of the tapered nut member, weight mounting bolt, and coupling member into a single integrated fastening bolt structure. The fastening bolt includes an integrated locking mechanism with a groove that engages with a protrusion on the coupling member, eliminating the need for separate nut members and reducing component count while maintaining secure mounting reliability.
Solution Approach 2:
The fastening bolt serves multiple functions: it secures the outer weight to the handle pipe, couples the inner weight to the outer weight, and provides vibration isolation through the integrated rubber member. This multi-functional design reduces the overall complexity of the handle weight mounting structure.
2Reliability
If precise machining is performed on the handle pipe and outer weight fitting portion, then the handle weight can be securely attached, but production cost increases
Solution Approach 1:
The patent changes the mounting approach from precise radial expansion and pressing against the inner face of the handle pipe to a threaded engagement system. The fastening bolt threads engage with a threaded hole in the handle pipe, and the lock portion engages with the coupling member, eliminating the need for precise radial dimensional control and reducing machining requirements.
Solution Approach 2:
The patent segments the fastening function into distinct engagement points: threaded engagement with the handle pipe and groove-protrusion engagement with the coupling member. This segmentation allows for standardization of components and reduces the need for custom precise machining of the handle pipe and outer weight fitting portion.
3Strength
If a tapered-shaped nut member is used to expand the outer weight fitting portion radially, then the handle weight can be fixed, but the structure requires expensive precise machining
Solution Approach 1:
The patent merges the radial expansion function and the fixing function into a single threaded engagement mechanism. The fastening bolt provides both the securing force and the positioning, eliminating the need for precise radial expansion of the outer weight fitting portion and reducing manufacturing precision requirements.
Solution Approach 2:
Instead of expanding the outer weight fitting portion radially to achieve fixation, the patent inverts the approach by using a threaded hole in the handle pipe that receives the fastening bolt. This reverses the machining requirement from the outer weight fitting portion to the handle pipe, where standard threading can be applied more easily and less expensively.
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 simplifies the structure, reduces variation in vibration isolating performance, and lowers production costs by minimizing the need for precise machining and expensive cutting tools, while enhancing the durability and universality of the handle weight.
Implementation Method 1
an inner weight (66) which is supported inside the handle pipe (14) via a rubber member (68)
Data Source
AI summary
A handle weight mounting structure of a straddle-type vehicle which achieves a simple structure and thereby enables a reduction of variation in the vibration isolating performance and a cost reduction. A fastening bolt includes a shank portion in which an external thread portion to be screwed and joined to the inner face of a handle pipe is formed; and a head portion which is formed on an end part of the shank portion for pressing the outer weight in the axial direction of the handle pipe, the shank portion includes a lock portion which is designed to couple the outer weight and the inner weight to each other. The lock portion is provided on an end part of the external thread portion opposite from the head portion.