Trailer Drawbar Nutplate Layout for Compact Load Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing telescopic drawbars for trailers have sub-optimal load distribution and are bulky due to U-shaped outer housings with horizontal mounting flanges, which add to the size and weight of trailers.
Innovation Solution
A drawbar design featuring a hollow elongated main profile with profile holes and a plate nut on the inner side, allowing for efficient threaded engagement and better load distribution, using plate nuts that can be easily replaced and installed without direct access to the main profile interior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a U-shaped outer housing with horizontal mounting flanges is used, then the drawbar can be reliably attached to the trailer chassis, but the load distribution is sub-optimal and the construction becomes large and heavy
Solution Approach 1:
The outer housing is divided into a top part and a bottom part that are separable and can be attached to the trailer chassis at different locations. This segmentation allows for optimized load distribution while reducing the overall size and weight of the drawbar construction.
Solution Approach 2:
The mounting flanges are repositioned from horizontal to vertical orientation, changing the dimensional arrangement of the attachment points. This vertical arrangement allows for better load distribution along the height of the trailer chassis, improving both reliability and reducing the required construction size.
2Ease of manufacture
If vertically arranged bolts are used to attach the U-shaped profile, then the drawbar can be attached to the trailer, but the load distribution is sub-optimal
Solution Approach 1:
The attachment system uses asymmetric positioning of the top and bottom parts relative to the trailer chassis, with the top part attached higher and the bottom part attached lower. This asymmetric arrangement creates optimal load distribution by distributing forces across different vertical levels, improving stress management while maintaining ease of manufacture.
3Adaptability or versatility
If threaded holes are formed directly in the main profile, then threaded engagement can be realized, but the process becomes time consuming and labor intensive
Solution Approach 1:
The threaded holes are extracted from the main profile and relocated to the top and bottom parts. This allows the main profile to be manufactured without time-consuming threading operations, while the top and bottom parts (which are easier to manufacture with threaded holes) provide the threaded engagement capability. This significantly improves manufacturing productivity while maintaining adaptability.
4Volume of moving object
If a compact drawbar design is implemented, then the size and weight are reduced, but the structural integrity must be maintained
Solution Approach 1:
The top part, bottom part, and main profile are merged through rigid attachment to form a unified structural assembly. This merging maintains structural integrity by creating a continuous load path from the towing vehicle through the main profile to the trailer chassis, while the compact design reduces overall volume and weight.
Solution Approach 2:
The top and bottom parts are pre-attached to the main profile during manufacturing, creating a pre-assembled unit with optimized structural properties. This preliminary action ensures that the compact design maintains structural integrity under operational loads by having the components already positioned and secured in their optimal configuration.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present disclosure relates to a drawbar (2), a drawbar arrangement and a method (600) for manufacturing a drawbar. The drawbar (2) comprises a main profile (21) comprising a first side surface (211) and an opposite second side (212) surface wherein the first side surface (211) comprises at least two first profile holes (251) forming a first profile hole configuration. The drawbar (2) further comprises a first plate nut (4a) comprising first threaded holes (41) forming a first plate nut hole configuration matching the first profile hole configuration, wherein the first plate nut (4a) is arranged on an inner side (211a) of the first side surface (211) such that the first plate nut hole configuration matches the first profile hole configuration wherein the first threaded holes are configured to be engaged by a respective threaded fixation element (26, 26a-d) extending through a respective first profile hole (251).