Railcar Carbody Vertical Positioning via Threaded Rotating Body
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Solution Overview
Problem
The existing method for attaching interior materials in railcar carbodies, which relies on liners and bolt positioning, is labor-intensive and lacks precision, and requires skilled workers, while also being insufficient for high vertical loads.
Innovation Solution
A carbody design featuring a rotating body threadedly engaged with a supporting body, allowing for adjustable vertical displacement to precisely position support target members relative to the roof bodyshell, enhancing strength and stability without requiring skilled labor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liners are stacked and adhered to adjust interior material positions, then appearance flatness is improved, but manufacturing time and labor skill requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-attaching positioning members to the vehicle body structure at predetermined positions before interior material installation. This pre-positioning eliminates the need for time-consuming adjustment work during assembly, as the positioning members already establish the correct positions and orientations for interior materials, directly resolving the contradiction between achieving appearance flatness and reducing manufacturing time.
2Strength
If bolts are used to attach metal fittings for vertical positioning, then structural strength is improved, but positioning precision and adaptability decrease
Solution Approach 1:
The patent applies dynamics by replacing fixed bolt connections with adjustable positioning members that can be positioned at multiple height levels. The positioning members maintain structural strength through their connection to the vehicle body structure while enabling precise vertical positioning adjustments. This dynamic adjustability resolves the contradiction by allowing the system to adapt to different positioning requirements while maintaining adequate strength.
Solution Approach 2:
The patent applies parameter changes by modifying the positioning mechanism from fixed bolt positions to adjustable positioning members with variable vertical positions. The positioning members can be set at different heights along the vehicle body structure, changing the positional parameters to achieve precise vertical alignment. This parameter variability resolves the contradiction between maintaining attachment strength and achieving positioning precision.
3Manufacturing precision
If multiple adjustment operations are performed manually, then positioning accuracy is improved, but productivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-installing positioning members at the correct positions during the vehicle body structure assembly phase. This preliminary positioning eliminates the need for multiple subsequent adjustment operations, as the positioning members are already in their final positions when interior materials are installed. This directly resolves the contradiction by achieving positioning accuracy through pre-positioning rather than through time-consuming manual adjustments.
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 design enables stable and precise adjustment of vertical distances between the roof bodyshell and support target members, improving strength and reducing the need for skilled labor, while maintaining structural integrity under vertical loads.
Implementation Method 1
a rotating body which is threadedly engaged with the supporting body and rotates relative to the supporting body about an axis extending in a vertical direction to be displaced relative to the supporting body in the vertical direction
Data Source
AI summary
A carbody of a railcar includes: a roof bodyshell; a supporting body provided under the roof bodyshell, the supporting body being attached to the roof bodyshell in a state of being positioned in the vertical direction; a rotating body which is threadedly engaged with the supporting body and rotates relative to the supporting body about an axis extending in a vertical direction to be displaced relative to the supporting body in the vertical direction; and a support target member supported by the roof bodyshell through the supporting body and the rotating body, the support target member being attached to the rotating body in a state of being positioned in the vertical direction, a vertical distance between the roof bodyshell and the support target member being adjustable by displacement of the rotating body relative to the supporting body.