V-belt Core Exposure Control for Power Transmission
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Solution Overview
Problem
Existing V-belts experience reduced power transmission efficiency due to exposed cores with lower friction coefficients and uneven pressure distribution, leading to inefficient power transfer between the belt and pulleys.
Innovation Solution
A V-belt design with cores embedded in an intermediate rubber layer, where the length of core exposure through lateral surfaces is limited to half or less of the core length, and strategic arrangement of cores and rubber layers to enhance frictional force and reduce deformation, along with cogs in the lower and upper rubber layers to maintain contact and limit deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If cores are wound without any interval to increase the number of cores, then power transmission capability is improved, but cores are exposed through lateral surfaces causing reduced friction coefficient and uneven pressure distribution
Solution Approach 1:
The patent applies local quality by providing rubber layers that selectively cover the core exposed portions at the lateral surfaces of the V-belt. This creates a non-uniform structure where the core is covered at the edges (where it would otherwise be exposed) while remaining exposed in the central region. The rubber layers are positioned to extend from the lateral surfaces toward the center, creating zones with different friction characteristics that collectively improve overall power transmission reliability.
2Strength
If belt lower portion width increases due to elastic deformation, then belt is pressed against sheaves, but power transmission efficiency is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the V-belt structure, specifically the angles of the lateral surfaces. The first and second lateral surfaces are configured with specific angle ranges (30°-60° and 10°-30° respectively) to optimize the distribution of contact pressure with the sheaves. This angular configuration helps control the elastic deformation of the belt lower portion, maintaining appropriate contact pressure while improving power transmission efficiency.
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 significantly enhances power transmission efficiency by increasing frictional forces and leveling pressure distribution, allowing for more effective power transfer between the driving and driven pulleys.
Implementation Method 1
a first rubber layer... a second rubber layer... allowing for more effective power transfer between the belt and pulleys
Data Source
Figure 1
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AI summary
A V-belt (23) is wound around a driving pulley (21) so as to be sandwiched between first and second sheaves (21A,21B) and wound around a driven pulley (22) so as to be sandwiched between first and second sheaves (22A,22B). The V-belt (23) includes: an intermediate rubber layer (43) in which a plurality of cores (46) are embedded; an upper rubber layer (44) provided above the intermediate rubber layer (43); and a lower rubber layer (42) provided below the intermediate rubber layer (43). A length of a portion of the core (46) thorough a first left lateral surface (51L) and a length of a portion of the core (46) exposed through a first right lateral surface (51 R) are each equal to or less than a half of a length of the core (46).