Oldham Coupling Absorbs Perpendicular Forces in Coolant Nozzle
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Solution Overview
Problem
The coolant application device experiences reduced service life due to perpendicular forces applied to bearings and misalignment between the motor and nozzle shaft axes, leading to excessive wear and deformation.
Innovation Solution
Incorporating an Oldham coupling between the motor and nozzle shafts to absorb perpendicular forces, with an intermediate member that guides and aligns the shafts, and using a softer material for the coupling components to concentrate wear and facilitate replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the nozzle is directly connected to the motor shaft without an Oldham coupling, then the structure is simple, but the perpendicular force from coolant spouting causes excessive wear and deformation of bearings and parts, shortening service life
Solution Approach 1:
An Oldham coupling is introduced as an intermediary component between the motor shaft and nozzle shaft. This coupling includes an intermediate member with grooves that engages both shafts, allowing it to absorb perpendicular forces generated during coolant spouting while transmitting rotational motion. The intermediary structure protects the motor and nozzle bearings from excessive wear.
Solution Approach 2:
The Oldham coupling changes the mechanical parameter transmission by allowing slight misalignment and absorbing perpendicular forces through the intermediate member's groove geometry. This parameter change enables the system to tolerate force variations without compromising the motor or nozzle shaft integrity.
2Power
If the motor shaft and nozzle shaft are precisely aligned, then the force transmission is efficient, but manufacturing and assembly costs increase due to high dimensional and assembly accuracy requirements
Solution Approach 1:
The Oldham coupling serves as a mediator that accommodates shaft misalignment. The intermediate member with its grooves engages both the motor shaft and nozzle shaft, allowing for dimensional tolerances in manufacturing and assembly while still effectively transmitting rotational motion and absorbing perpendicular forces.
3Stability of the object's composition
If the nozzle shaft is made more rigid to resist perpendicular forces, then the structural stability improves, but the wear and deformation of bearings and parts increases due to the concentrated load
Solution Approach 1:
The Oldham coupling's intermediate member acts as a load-absorbing intermediary that protects the nozzle shaft and its bearings from excessive perpendicular forces. The coupling design distributes the load through its groove geometry, preventing concentrated stress on the nozzle shaft while maintaining structural stability.
Data Source
AI summary
The present invention provides a technique in which service life of a coolant application device can be extended. The coolant application device includes a nozzle body which spouts coolant, a hollow shaft which rotates the nozzle body, a motor which controls a rotation angle of the hollow shaft, and an Oldham coupling portion which connects the hollow shaft and an output shaft of the motor, the Oldham coupling portion transmits driving force of the motor to the hollow shaft, allowing a misalignment between an axis of the hollow shaft and an axis of the output shaft.