Vehicle Slide Door Guide Roller Crystallinity Gradient
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Solution Overview
Problem
Conventional guide rollers for vehicle slide doors are prone to damage such as cracking and peeling of the synthetic resin sliding layer due to local loads when the arm member rocks and the support shaft tilts, leading to potential fall-off of the sliding layer from the outer ring.
Innovation Solution
A guide roller design with a synthetic resin sliding layer having varying crystallinity and nanoindenter hardness across different areas, specifically a sliding surface side area, intermediate area, and interface side area, where the intermediate area has a higher nanoindenter hardness to absorb loads and prevent deformation propagation, combined with a flange portion on the outer ring for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the guide roller is made with a simple sliding layer structure, then the manufacturing cost is reduced, but the sliding layer is prone to cracking and peeling when subjected to local loads from tilting
Solution Approach 1:
The patent applies local quality by creating distinct regions within the sliding layer with different properties. The first region (near the guide rail contact surface) has different crystallinity and/or hardness compared to the second region (inner portion). This gradient structure allows the surface region to resist wear and the inner region to provide toughness, preventing cracking and peeling while maintaining manufacturing feasibility through controlled processing parameters.
Solution Approach 2:
The patent employs composite material principles by forming a sliding layer with non-uniform microstructure containing different phases or crystalline regions. The sliding layer comprises a first region with specific crystallinity/hardness characteristics and a second region with different characteristics, creating a composite structure at the micro-scale that combines wear resistance with impact resistance, thereby preventing damage under local loads.
2Strength
If the sliding layer has high hardness throughout, then wear resistance is improved, but the sliding layer becomes prone to cracking under local loads
Solution Approach 1:
The patent applies local quality by creating distinct regions within the sliding layer with different properties. The first region (near the guide rail contact surface) has different crystallinity and/or hardness compared to the second region (inner portion). This gradient structure allows the surface region to resist wear and the inner region to provide toughness, preventing cracking and peeling while maintaining manufacturing feasibility through controlled processing parameters.
Solution Approach 2:
The patent employs composite material principles by forming a sliding layer with non-uniform microstructure containing different phases or crystalline regions. The sliding layer comprises a first region with specific crystallinity/hardness characteristics and a second region with different characteristics, creating a composite structure at the micro-scale that combines wear resistance with impact resistance, thereby preventing damage under local loads.
3Ease of manufacture
If the sliding layer is made with uniform properties, then the manufacturing process is simplified, but the sliding layer cannot effectively absorb local loads without transmitting them to the interface
Solution Approach 1:
The patent applies local quality by creating distinct regions within the sliding layer with different properties. The first region (near the guide rail contact surface) has different crystallinity and/or hardness compared to the second region (inner portion). This gradient structure allows the surface region to resist wear and the inner region to provide toughness, preventing cracking and peeling while maintaining manufacturing feasibility through controlled processing parameters.
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 guide roller effectively prevents cracking and peeling of the sliding layer, maintaining its integrity even when subjected to tilting and local loads, thereby reducing abrasion and shearing forces at the interface with the outer ring.
Implementation Method 1
the synthetic resin of the sliding layer, which contacts the guide rail, is drawn by the guide rail, leading to an increase in elastic deformation of the synthetic resin in a direction of the sliding
Implementation Method 2
the synthetic resin in the sliding surface side area has a crystallinity X1, the synthetic resin in the intermediate area has a crystallinity X2, and the synthetic resin in the interface side area has a crystallinity X3
Data Source
AI summary
Provided is a guide roller for a vehicular slide door. The guide roller has an annular metal inner ring; a retainer holding a bearing; an annular metal outer ring and a sliding layer including a synthetic resin. When the sliding layer is sectionalized into a sliding surface side area, an intermediate area and an interface side area, from the sliding surface to an interface with the outer ring, the synthetic resins in the sliding surface side area, the intermediate area and the interface side area have, respectively, a degree of crystallizations X1, X2 and X3 and nanoindenter hardnesses Y1, Y2 and Y3 wherein X2−X1 is less than 5%, and X2−X3 is less than 5% and wherein Y2 is not less than 115% of Y1, and Y2 is not less than 115% of Y3.