Plastic Rail Base Plate With Metal Insert for High Torque Fastening
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Solution Overview
Problem
Plastic base plates used for supporting rails on substrates face issues with material failure under high loads and tightening torques, as the abutments intended for screw heads are often insufficient to withstand concentrated loads, leading to material breakage and inadequate holding.
Innovation Solution
Incorporating an insert piece made of a higher-strength material, such as metal or reinforced plastic, within the recess of the base plate, which provides a counter-bearing and supports the screw head, distributing loads and preventing material fatigue, while ensuring a secure, rotationally stable fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plastic base plate with a recess for screw head support is used, then the base plate is lightweight and easy to manufacture, but the abutments in the recess are too weak to withstand high tightening torques and concentrated loads
Solution Approach 1:
The invention uses a composite structure combining plastic base plate material with metal insert pieces. The insert pieces are made of metal material that is different from and has higher strength than the plastic base plate material, creating a composite structure that provides the necessary strength for withstanding high tightening torques while maintaining the lightweight and easy manufacturing advantages of the plastic base plate.
Solution Approach 2:
The invention applies local quality by inserting metal pieces only in the specific regions where high strength is needed (at the abutments supporting the screw heads), while the rest of the base plate remains as lightweight plastic. This localized reinforcement provides the necessary strength exactly where the concentrated loads are applied, without unnecessarily increasing the overall complexity or weight of the entire base plate structure.
2Reliability
If the recess diameter is increased to provide better support for the screw head, then the holding capacity is improved, but the material around the recess becomes weaker and more prone to breakage
Solution Approach 1:
The metal insert pieces provide the necessary holding capacity for the screw heads without requiring an increase in the recess diameter in the plastic material. The metal inserts are positioned within the recesses and provide the strong bearing surfaces needed for withstanding high loads, while the plastic base plate material around the recesses maintains its structural integrity and strength.
Solution Approach 2:
The metal insert pieces act as intermediary elements between the screw heads and the plastic base plate. Instead of directly increasing the recess size in the plastic (which would weaken the surrounding material), the metal inserts mediate the load transfer, providing the necessary holding capacity while protecting the plastic material around the recess from excessive stress and potential breakage.
3Strength
If conventional plastic base plates are used without insert pieces, then the manufacturing process is simple, but material breaks out under high loads and sufficient holding is no longer ensured
Solution Approach 1:
The invention uses composite materials by combining plastic base plate with metal insert pieces. The metal inserts provide the necessary resistance to material breakage under high loads and tightening torques, while the manufacturing process remains relatively simple through integrated production methods where the metal inserts are positioned and secured within the plastic base plate during or after molding.
Solution Approach 2:
The metal insert pieces are preliminarily positioned and prepared within the base plate structure before final assembly. The insert pieces are pre-placed in the recesses and secured with appropriate clearance and fitting, so that when the base plate is subjected to high loads, the metal inserts are already in position to prevent material breakage without requiring complex post-manufacturing modifications.
Data Source
AI summary
A base plate, which is made of plastic and is intended for supporting a rail for a rail vehicle on a substrate, may include a lower face, and an upper face on which a supporting surface for the rail is formed, a recess, from which a passage leads to the upper face of the base plate, being formed in the lower face of the base plate, the diameter of the recess in a direction transverse to the longitudinal axis of the passage being greater at least in part than the diameter of the passage, so that a stop for an insert piece fitted into the recess is formed on the top surface, assigned to the upper face of the base plate of the recess.