Belt Cover Design for Two-Wheeled Motor Vehicle
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Solution Overview
Problem
Existing two-wheeled motor vehicles with a swing arm coaxial with the engine unit's output shaft face challenges in protecting the toothed belt from debris rebounding from the swing arm and rear fender, as the positional relationship between the swing arm and toothed belt varies greatly, making it difficult to effectively block stones and pebbles using conventional dust guards.
Innovation Solution
A two-wheeled motor vehicle design featuring a swing arm with a belt cover that includes an inner wall portion, upper wall portion, and bottom wall portion, positioned to separate the toothed belt from the drive wheel and swing arm, effectively blocking debris flying from the drive wheel and swing arm, and preventing collision and rebound of stones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pivot shaft of the rear arm is located coaxially with the output shaft of the engine unit, then the drive wheel can be supported by the rear arm, but the positional relationship between the rear arm and toothed belt varies greatly, making it difficult to protect the toothed belt from stones and debris
Solution Approach 1:
The belt cover is divided into multiple functional portions: an inner wall portion that faces the toothed belt and blocks stones, an upper wall portion that covers the upper belt portion, and a bottom wall portion that covers the lower belt portion. This segmentation allows each portion to address specific protection needs while maintaining the coaxial pivot shaft configuration.
Solution Approach 2:
The belt cover acts as an intermediary protective structure between the toothed belt and the harmful stones/debris. The inner wall portion specifically serves as a mediator that intercepts stones before they can reach the toothed belt, while the upper and bottom wall portions provide additional coverage.
2Object-affected harmful factors
If a conventional dust guard is used to block stones from the rear fender, then the toothed belt can be protected from rear fender debris, but it cannot effectively block stones rebounding from the rear arm due to varying positional relationships
Solution Approach 1:
The belt cover is designed to perform multiple protection functions simultaneously: the inner wall portion protects from stones rebounding from the rear arm, the upper wall portion protects the upper belt portion, and the bottom wall portion protects the lower belt portion. This multi-functionality makes the protective structure adaptable to various stone rebound directions.
Solution Approach 2:
The protective structure extends in multiple dimensions: the inner wall portion faces the toothed belt in one dimension, while the upper and bottom wall portions extend in vertical dimensions. This three-dimensional configuration provides comprehensive protection against stones rebounding from the rear arm from various angles.
3Ease of operation
If the rear arm is inclined transversely from the pivot shaft toward the rearward portion, then the swing arm can cross the toothed belt, but the positional relationship between the rear arm and toothed belt varies greatly, dispersing stones in various directions
Solution Approach 1:
The belt cover provides localized protection at different positions: the inner wall portion is positioned to block stones from the drive wheel side, while the upper and bottom wall portions provide localized coverage at their respective heights. This local quality approach addresses the dispersion of stones in various directions by providing targeted protection at each location.
Data Source
Figure 1
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AI summary
A two-wheeled motor vehicle includes a swing arm (21) swingable about a pivot shaft (37, 39) coaxial with an output shaft, a rear wheel (23) supported by the swing arm (21), a drive pulley (51) mounted on the output shaft, a driven pulley (61) rotatable with the rear wheel (23), a toothed belt (65) wound around the drive pulley (51) and the driven pulley (61), and a belt cover (27) for protecting the toothed belt (65). The belt cover (27) includes an inner wall portion (W1) located at one side of the toothed belt (65) for separating the toothed belt (65) and the rear wheel (23). The belt cover (27) includes also an upper wall portion (W2) and a bottom wall portion (W4).