Work Machine Rotation Speed Difference Detection
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Solution Overview
Problem
Existing snowblowers with augers can experience overload when encountering ice blocks or stones, leading to stopped auger rotation and wear on power transmission components.
Innovation Solution
A work machine equipped with a drive source, transmission mechanism, driven rotary member, coupling mechanism, drive rotation speed detector, work rotation speed detector, and a control device that compares signals from these detectors to stop the drive source when a rotation speed difference occurs between the driven shaft and the work rotation shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the auger rotates at high speed to efficiently remove snow, then productivity is improved, but the risk of biting into ice blocks or stones increases, causing overload and component wear
Solution Approach 1:
The control device continuously monitors rotation speeds of both the driven shaft and work rotation shaft before overload occurs. By detecting rotation speed differences in advance (when the auger encounters ice blocks or stones), the system can stop the drive source before severe overload damages the friction member or other power transmission components, thus preventing wear while maintaining high-speed operation capability.
2Ease of manufacture
If a friction-based coupling mechanism is used to transmit rotation, then ease of manufacture and simplicity are improved, but slip occurs at low torque due to wear of the friction member
Solution Approach 1:
The control device uses feedback from rotation speed detectors to monitor the operational state of the friction-based coupling mechanism. By comparing the rotation speeds of the driven shaft and work rotation shaft, the system detects when the friction member is slipping or wearing out, and can take corrective action (stopping the drive source) to prevent complete failure, thereby maintaining reliable torque transmission throughout the friction member's service life.
3Device complexity
If no overload detection system is installed to maintain device simplicity, then device complexity is reduced, but wear of consumables occurs rapidly requiring frequent replacement
Solution Approach 1:
The rotation speed detectors and control device enable the work machine to self-monitor its own operational state. By automatically detecting overload conditions through rotation speed comparison and stopping the drive source when necessary, the system protects its own power transmission components without requiring external monitoring equipment or complex detection systems, thus extending consumable lifespan with minimal added complexity.
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
Prevents wear on power transmission components by detecting and addressing overload conditions, thereby extending the lifespan of consumables and reducing maintenance needs.
Implementation Method 1
a coupling mechanism configured to couple a work rotation shaft coupled to a working section and the driven shaft to each other via a friction member and transmit the rotation of the driven shaft to the work rotation shaft
Data Source
AI summary
A work machine includes: a drive rotation speed detector configured to detect a signal indicating a rotation of a drive source; a work rotation speed detector configured to detect a signal indicating rotation of a work rotation shaft; and a control device configured to, on the basis of comparison between signals acquired from the drive rotation speed detector and the work rotation speed detector, stop the drive source in a case where there is a rotation speed difference between a driven shaft in a rotating state due to power transmission from the drive source and the work rotation shaft. The work rotation speed detector includes: a detection target member configured to rotate together with the work rotation shaft; and a sensor mounting member configured to hold a detection sensor configured to detect rotation of the detection target member.