Composite Gear Structure for Balanced Fiber Distribution and Bonding
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Solution Overview
Problem
The reinforcing fiber in resin composite structure rotating bodies may struggle to follow irregular regions during molding, particularly in protruding areas between recessed regions, leading to uneven distribution and potential strength deficiencies.
Innovation Solution
A composite structure rotating body design featuring recessed regions with shallow recessed portions on both surfaces of the resin molded body, allowing reinforcing fibers to be evenly distributed, and a bonding resin member to secure strength while minimizing bonding property deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep recessed portions are formed in the resin molded body, then bonding property between the resin molded body and bonding resin member is improved, but reinforcing fiber distribution in the region adjacent to the recessed region deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the depth of recessed portions and the thickness of thin portions in the resin molded body. The specific parameter relationship (total depth of recessed portions < thickness of thin portion) optimizes both bonding property and reinforcing fiber distribution, resolving the contradiction between these two requirements.
2Reliability
If the total depth of recessed portions exceeds the thin portion thickness, then bonding property is enhanced, but reinforcing fiber follows the irregular regions poorly
Solution Approach 1:
The patent resolves this contradiction by establishing a specific parameter relationship where the total depth of recessed portions is controlled to be less than the thickness of the thin portion. This parameter optimization ensures that reinforcing fibers can properly follow the irregular regions during molding while still achieving adequate bonding property.
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A composite structure gear includes a ring-shaped resin molded body containing reinforcing fiber and resin and having tooth profiles formed on an outer peripheral portion, a ring-shaped metal bush, and a bonding resin member that bonds the resin molded body and the metal bush. In the resin molded body, a plurality of recessed regions are formed at predetermined intervals in a circumferential direction, and a thin portion in which recessed portions are formed on both surfaces in a thickness direction of the resin molded body is provided the recessed region. In the recessed region, a total value of depths of the recessed portions on both surfaces is smaller than a thickness of the thin portion.