Direct-Drive Cleaner Wheel Coupling for Stable Manual Movement
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Solution Overview
Problem
Conventional cleaners face issues with smooth movement and stability when the driving motor is off, leading to potential wobbling or turning over when manually dragged due to frictional forces between gears and wheels, and may slip or wobble during direction changes.
Innovation Solution
The cleaner incorporates a direct connection of the rotating shaft of the driving motor to the traveling wheel, a shock-absorbing mechanism, and a caster for stability, along with a motor cover design that prevents water ingress and reduces shock to the rotating shaft, allowing smooth rotation and improved maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If gears are used to transmit rotating force from the driving motor to the traveling wheel, then torque is stably increased and shock is reduced, but frictional force increases causing difficulty in smooth movement when the motor is off
Solution Approach 1:
The patent removes the gear transmission system from the cleaner design, directly coupling the driving motor to the traveling wheel. This extraction eliminates the gear friction that prevented smooth movement when the motor was off, while the motor's direct drive capability maintains sufficient torque for operation.
2Stability of the object's composition
If reduction gears are used to increase torque, then the traveling wheel rotates stably, but the main body may turn over when forcibly moved during direction changes
Solution Approach 1:
The patent eliminates the reduction gear system entirely, directly connecting the driving motor to the traveling wheel. This removal of intermediate mechanical components prevents the accumulation of frictional forces and reaction forces that caused the main body to turn over during direction changes, while maintaining rotational stability through direct motor control.
3Force
If multiple gears are used for torque transmission, then shock is absorbed and torque is increased, but device complexity increases
Solution Approach 1:
The patent completely removes the multi-gear transmission system (G1, G2, G3, G4, G5) and implements direct coupling between the driving motor and traveling wheel. This simplification eliminates complex gear engagement relationships while maintaining effective torque transmission through the motor's direct drive capability.
4Productivity
If the main body is forcibly moved at high speed, then cleaning efficiency improves, but the main body slips and wobbles due to speed exceeding wheel rotation capability
Solution Approach 1:
The patent removes the gear reduction system that limited wheel rotation speed relative to motor speed. The direct coupling allows the traveling wheel to rotate at speeds matching the main body's movement, preventing slippage and wobble during high-speed operation while maintaining cleaning productivity.
Data Source
AI summary
A cleaner that includes: a main body; a suction assembly; and a coupling hose, wherein the main body includes: an air suctioning device, a case, a driving motor that is coupled to a first surface of the case and that is configured to generate driving force, a traveling wheel that is coupled to the first surface of the case and that is configured to rotate based on driving force generated by the driving motor, a motor cover that is configured to cover the driving motor such that the driving motor is located in a space between the first surface of the case and the motor cover, a rotating shaft that is coupled to the driving motor and that is configured to transfer driving force generated by the driving motor to the traveling wheel, and a coupling unit that couples the rotating shaft to the traveling wheel is disclosed.