Motorcycle Wheel Hub Integration for Single Machining
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Solution Overview
Problem
Conventional motorcycle wheel production methods require multiple machining processes, leading to poor production workability and increased complexity due to the need for separate auxiliary tubular members and cores in the casting process, as well as inaccurate positioning of bearing support surfaces.
Innovation Solution
A unitary die-cast wheel body with an integrated hub section featuring an outer and inner tubular section connected via ribs, where the inner tubular section projects beyond the outer tubular section, allowing for a single machining process to form bolt holes and bearing support surfaces, and a damper housing is attached using bolts, simplifying the assembly and improving workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If auxiliary tubular members are used to form spaces in the hub section, then weight reduction is achieved, but casting process complexity increases due to the need for cores or molds
Solution Approach 1:
The invention merges the inner tubular section and outer tubular section into a single integrated hub structure formed by one casting process. The hub section includes an inner tubular section with a first end opening and an outer tubular section with a second end opening, where the outer tubular section is formed integrally with the inner tubular section. This eliminates the need for separate auxiliary tubular members and cores, achieving weight reduction while simplifying the casting process.
2Weight of moving object
If separate inner tubular sections are formed in the wheel and damper housing, then weight reduction is achieved, but machining complexity increases due to multiple machining processes required
Solution Approach 1:
The invention combines the inner tubular section and outer tubular section into a single integrated structure that can be machined as one piece. The hub section is formed with through-holes extending through the inner tubular section, and the damper housing is attached to the outer tubular section. This integration reduces the number of machining processes from multiple separate operations to a single unified machining process, improving ease of manufacture while maintaining weight reduction benefits.
Solution Approach 2:
The invention performs preliminary positioning by forming the inner tubular section and outer tubular section with pre-defined geometric relationships during the casting process. The outer tubular section is positioned relative to the inner tubular section in the casting mold, establishing accurate spatial relationships before machining. This preliminary action eliminates the need for complex positioning and alignment during subsequent machining operations.
3Manufacturing precision
If inner circumferential surfaces are machined before assembly, then bearing support surfaces can be formed, but accurate positioning cannot be achieved
Solution Approach 1:
The invention merges the positioning and machining operations by forming the inner tubular section and outer tubular section as an integrated structure with pre-defined geometric relationships. The through-holes in the inner tubular section and the attachment features on the outer tubular section are positioned relative to each other during casting, ensuring accurate positioning is maintained when bearing support surfaces are machined on the inner circumferential surface.
Data Source
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AI summary
Superior production workability to provide a wheel of a motorcycle is provided by requiring only one machining to the wheel. A rim section 11 to which a tire is mounted, a hub section 12 including an inner tubular section 14 and an outer tubular section 15, and a plurality of spoke sections 13 connecting the rim section 11 and the hub section 12 to each other are provided. Bolt holes 22 can be provided to the outer tubular section 15 of the hub section 12 for attaching a damper housing attaching section. A pair of bearing support surfaces 17, 18 can be formed in the inner tubular section 14 of the hub section 12 and on both ends of inner circumferential surfaces thereof.