Working Machine Slip Mechanism for Torque Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In working machines like chainsaws, the torque transmitted from the prime mover to the working part via the output shaft can be reduced when the load torque required to drive the fan increases, such as in wet conditions, leading to inefficient operation.
Innovation Solution
A slip mechanism is integrated into the working machine, allowing the output shaft and fan to rotate either integrally or relative to each other based on the load torque. When the load torque is less than a predetermined value, the components rotate integrally, and when the load torque exceeds this value, they rotate relative to each other, thereby managing torque transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fan is rigidly coupled to the output shaft, then the fan rotates integrally with the output shaft under all conditions, but the torque transmitted to the working part is reduced when load torque increases
Solution Approach 1:
The patent applies the dynamics principle by making the coupling between the fan and output shaft changeable rather than fixed. The slip mechanism allows the connection to dynamically switch between integral rotation (when load torque is low) and relative rotation (when load torque is high), enabling the system to adapt its torque transmission characteristics based on operating conditions and prevent torque reduction to the working part
2Reliability
If the fan is rigidly coupled to the output shaft, then the structure is simple, but the torque transmission is inconsistent under varying load conditions
Solution Approach 1:
The patent introduces a slip mechanism as an intermediary component between the fan and output shaft. This mediator enables intelligent torque management by allowing relative rotation when load torque exceeds a threshold, thereby maintaining consistent torque transmission to the working part while adding only moderate structural complexity through the inclusion of friction elements and clearance design
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 helps maintain consistent torque transmission to the working part by allowing the fan to slip relative to the output shaft when load torque increases, thus preventing a reduction in torque and ensuring efficient operation across varying conditions.
Implementation Method 1
static friction torque generated by the slip mechanism is greater than the load torque
Implementation Method 2
the fan is caused to slip against the output shaft
Data Source
AI summary
A working machine may include a prime mover including an output shaft, a working part coupled to the output shaft, a slip mechanism, and a fan attached to the output shaft via the slip mechanism. The slip mechanism may be configured to: in a case where a load torque applied on the output shaft when driving the fan is less than a predetermined value, rotate the output shaft and the fan integrally with each other, and in a case where the load torque when driving the fan is greater than or equal to the predetermined value, rotate the output shaft and the fan relative to each other.