Planetary Gear Drive Decoupling Mechanism for Wear Reduction
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Solution Overview
Problem
Planetary gear drives used in off-road and agricultural applications face excessive wear and potential damage when transitioning from low-speed field operations to higher-speed road use, as the gear wheels can rotate at high speeds, leading to secondary wear and breakage.
Innovation Solution
A planetary gear drive system with a second coupling bush that allows for linear shifting to decouple the satellite carrier from the wheel spindle, enabling the system to switch between coupled and decoupled states, preventing high-speed rotation and reducing wear by using a linear actuator for controlled coupling and decoupling while driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the planetary gear drive is used for field operations at low speed, then high torque is achieved, but excessive wear and breakage occur during road transport at high speed
Solution Approach 1:
The patent implements a dynamic coupling system where the satellite carrier can be selectively coupled to or decoupled from the wheel spindle. During field operations, the satellite carrier is coupled to transmit high torque at low speeds. During road transport, the satellite carrier is decoupled to prevent high-speed rotation damage, transforming the system from static to dynamic operation modes.
Solution Approach 2:
The patent divides the drive system into separable components: the satellite carrier assembly and the wheel spindle assembly, connected through a coupling mechanism. This segmentation allows independent control of each assembly, enabling the satellite carrier to be disengaged from the wheel spindle during road transport to prevent wear while maintaining drive functionality during field operations.
2Reliability
If the motor is decoupled during road transport, then the motor is protected from acting as pump or generator, but the gear wheels still rotate at high speed causing secondary wear
Solution Approach 1:
The patent extracts the satellite carrier assembly from the wheel spindle assembly through a decoupling mechanism. By removing the satellite carrier from its engaged position with the wheel spindle, the system eliminates the transmission path that would otherwise cause high-speed rotation of gear wheels during road transport, thereby preventing secondary wear while the motor remains decoupled.
3Reliability
If a coupling mechanism is added to enable decoupling, then wear is reduced during road transport, but device complexity increases
Solution Approach 1:
The patent introduces a coupling bush as an intermediary component between the satellite carrier and wheel spindle. This coupling bush serves as a mediator that can be positioned to either connect or disconnect the two assemblies. The coupling mechanism uses this intermediary element to enable simple axial movement for coupling/decoupling operations, minimizing complexity while achieving the wear reduction goal.
Data Source
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AI summary
The invention concerns a planetary gear drive (100) suitable for driving machines in the so called off road segment including agriculture. The invention also relates to a towed or carried machine comprising the planetary gear drive (100) used an auxiliary drive. The invention also relates to a method for coupling and decoupling a planetary gear drive (100) of a towed machine i.e. allowing it to have free wheel.