Mower Deck Single Belt Transmission with Elevated Idler Pulley
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Solution Overview
Problem
Existing mower units with belt transmission mechanisms face issues of high cost and space requirements due to multiple belt systems, and suffer from mechanical load and limited lift stroke due to belt tilting during mower unit elevation.
Innovation Solution
A mower unit configuration with a single belt routed around an output pulley, an idler pulley unit, and blade pulleys, where the idler pulley unit includes a tension idler pulley and two idler pulleys, allowing for three-dimensional belt routing with the forward and reverse belt portions passing over the blade belt portion, reducing mechanical load and enabling longer lift strokes without compromising belt power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single belt transmission mechanism is used, then cost and space are reduced, but the belt tilts significantly during mower unit elevation causing increased mechanical load
Solution Approach 1:
The patent positions the idler pulley at a higher vertical dimension than the blade pulleys, creating a three-dimensional belt routing arrangement. The forward and reverse belt portions extend to pass over and above the blade belt portion, transforming a two-dimensional planar routing into a three-dimensional spatial configuration. This dimensional change allows the belt to maintain better alignment during mower unit elevation, reducing tilting-induced mechanical load while using a single belt transmission mechanism.
2Area of stationary object
If the distance between output pulley and idler pulley is short, then space is saved, but the belt tilts more during lift stroke
Solution Approach 1:
Instead of increasing the horizontal distance between the output pulley and idler pulley, the patent utilizes the vertical dimension by positioning the idler pulley higher than the blade pulleys. This three-dimensional arrangement achieves the dual benefit of maintaining compact horizontal space while ensuring reliable belt power transmission by reducing belt tilt during lift stroke through the elevated idler pulley position.
3Reliability
If multiple belt transmission mechanisms are used, then stable power transmission is achieved, but cost and space requirements increase
Solution Approach 1:
The patent merges the functions of multiple belt transmission mechanisms into a single belt system. By using one continuous belt that routes around the output pulley, elevated idler pulley, and blade pulleys in a three-dimensional configuration, the system achieves stable power transmission to multiple blade rotational shafts without requiring separate belt mechanisms, thereby reducing cost and device complexity while maintaining reliability.
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
This configuration extends the service life of belts and pulleys, reduces mechanical load, and allows for increased lift stroke without affecting belt power transmission, while minimizing space requirements and tilting-induced loads.
Implementation Method 1
An idler pulley is provided for applying tension by means of a spring to both the first belt transmission mechanism and the second belt transmission mechanism.
Data Source
AI summary
[Summary] A mower unit includes an idler pulley unit and a single belt routed around an output pulley of a drive source, the idler pulley unit and a plurality of blade pulleys. The idler pulley unit includes a first idler pulley, a second idler pulley and a tension idler pulley. A pulley height of the idler pulley unit is set higher than a pulley height of the blade pulleys, and a forward belt portion from the output pulley and a reverse belt portion to the output pulley extend to pass over and above the blade belt portion.