Offset Paddle Tire Structure for Sand and Mud Traction
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Solution Overview
Problem
Paddle tires face challenges in providing optimal traction on fluid-like terrains such as sand or mud due to the limitations in paddle design and configuration, which affect the vehicle's propulsion and stability.
Innovation Solution
A paddle tire design featuring alternating right-side and left-side paddles with varying heights and lengths, where each paddle has a scoop portion with a concave curved surface, and their centerlines are offset from the tire's centerline, providing enhanced traction by optimizing the contact area and friction distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional paddle designs are used, then manufacturing is simpler, but traction and propulsion on loose friction terrains are insufficient
Solution Approach 1:
The paddle is divided into multiple segments with different heights along its circumference. Specifically, each paddle includes a first portion with a first height and a second portion with a second height that is greater than the first height. This segmentation allows different portions of the paddle to engage with the terrain at different depths, improving traction on loose surfaces while maintaining a manageable overall structure.
Solution Approach 2:
Different portions of the paddle are given different local properties through varying heights. The first portion has a smaller height suitable for initial contact and steering, while the second portion has a larger height for deep engagement and propulsion. This local differentiation optimizes performance across various terrain conditions without requiring complete redesign of the entire paddle.
2Reliability
If paddles are aligned uniformly, then manufacturing is easier, but propulsion and stability are reduced
Solution Approach 1:
The paddle design introduces asymmetry by alternating between left-side paddles and right-side paddles around the tire circumference. Each paddle type is offset from the tire's centerline by a distance D, with left-side paddles offset to one side and right-side paddles offset to the other side. This asymmetric arrangement creates a scooping action that enhances propulsion on loose terrain while maintaining rotational symmetry for manufacturing efficiency.
3Reliability
If single-height paddles are used, then structure is simpler, but engagement with terrain is insufficient
Solution Approach 1:
Each paddle is segmented into two distinct height portions: a first portion with height H1 and a second portion with height H2, where H2 > H1. This segmentation enables the paddle to engage terrain at multiple depths simultaneously, with the shorter portion providing initial contact and the longer portion providing deeper penetration and stronger engagement forces.
Solution Approach 2:
The paddle design adds vertical dimensionality variation by implementing different heights at different circumferential positions. Instead of a uniform single-height design, the paddle extends to different radial distances from the tire center at different angles, creating a multi-level engagement profile that enhances terrain interaction without significantly complicating the basic paddle form.
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 design enhances traction and propulsion on loose friction terrains by ensuring better engagement with the terrain, improving the vehicle's mobility and stability, especially in conditions like sand or mud.
Implementation Method 1
Each paddle of the plurality of paddles may comprise a scoop portion with a concave curved surface
Data Source
AI summary
A paddle tire with a tire body and a plurality of paddles. The tire body has a right sidewall, a left sidewall, and an outer surface joining the right sidewall to the left sidewall. The paddles are affixed to the outer surface at discrete intervals around a circumference of the tire body and alternate between left-side paddles and right-side paddles. A right portion of each right-side paddle adjacent the right sidewall of the tire body has a first height and a left portion of each right-side paddle distal to the right sidewall of the tire body has a second height. A left portion of each left-side paddle adjacent the left sidewall of the tire body has a first height and a right portion of each left-side paddle distal to the left sidewall of the tire body has a second height. The second height is less than the first height.