Removable Belt Guide for Tight-Space Belt Tensioner Assembly
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Solution Overview
Problem
Existing belt tensioners with outward facing rollers face installation challenges in tight spaces, and the spring force applied by tensioners makes it difficult to position belts correctly during assembly, leading to potential misalignment and parasitic drag issues.
Innovation Solution
A removable belt guide is used to position the belt radially with respect to the pulley, allowing the tensioner to be installed with inward facing rollers, and a pin mechanism to hold the rollers in a released state until the guide is removed, enabling easier assembly and tension application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If outward facing rollers are used in the belt tensioner, then the roller can be supported from the end closest to the engine, but there is not enough space to support the roller in this fashion in tight spaces
Solution Approach 1:
The patent inverts the conventional roller support approach by using inward facing rollers instead of outward facing rollers. The roller is supported from the end farthest from the engine, allowing the roller to face inward toward the engine. This inversion enables the tensioner to be installed in tight spaces where outward facing rollers would not have sufficient support space, while still achieving proper belt tensioning functionality.
2Reliability
If spring force is applied by the tensioner to maintain belt tension, then proper belt tensioning is achieved, but it makes it difficult to position belts correctly during assembly
Solution Approach 1:
The patent applies preliminary action by using a belt guide to position the belt correctly during assembly before the spring force is fully engaged. The belt guide maintains proper belt alignment and positioning during the installation process, allowing the belt to be correctly positioned despite the presence of spring force. Once installation is complete, the belt guide is removed and the spring force continues to maintain proper belt tension.
Solution Approach 2:
The belt guide acts as an intermediary component that mediates between the spring force and the belt during assembly. It provides a temporary mechanism to control belt positioning during installation, overcoming the difficulty posed by the spring force. The belt guide is removed after installation, leaving the spring to maintain continuous belt tension.
3Manufacturing precision
If a removable belt guide is used to position the belt radially, then belt alignment is maintained during assembly, but the device complexity increases
Solution Approach 1:
The patent extracts the belt positioning function into a separate, removable belt guide component rather than integrating it permanently into the tensioner structure. This allows the belt guide to be used only during assembly when needed for alignment, and then removed to simplify the final device. The extraction principle reduces the complexity of the installed tensioner while maintaining the benefit of precise belt alignment during assembly.
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 belt guide simplifies the installation process by maintaining belt alignment and reducing the spring force's impact during assembly, ensuring proper belt tensioning and minimizing parasitic drag.
Implementation Method 1
The at least one spring is configured to move the at least one arm such that the respective roller rolls against a belt wrapped around the pulley and apply tension to the belt
Implementation Method 2
the normal force is typically applied via a roller that is supported to rotate with respect to a movable arm of the tensioner
Implementation Method 3
The belt guide is configured to position the belt radially with respect to the pulley. The belt guide may hold the tensioner in a released state in which the spring does not move the at least one arm
Data Source
AI summary
A belt tensioner for an engine accessory drive is installed over a pulley such that rollers extend toward the engine. Due the belt being between the tensioner and the engine, installation of the belt on the pulley is difficult. To simplify installation, a removable belt guide is included in the belt tensioner. Two methods of installing the belt and tensioner are envisioned. In a first method, the belt is first installed on the pulley and the belt guide holds the belt toward the pulley radially as the tensioner is installed over the pulley. In a second method, the belt is first installed to the tensioner and the guide holds the belt radially away from the pulley as the tensioner is installed over the pulley. In both methods, the belt guide is removed after the belt and tensioner are installed.