Electric Soil Roller Drive With Split Speed Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing soil cultivation rollers in machines like compactors face challenges in achieving suitable rotational speeds using electric drive motors without complex structural designs, particularly due to the need for gearboxes that require intricate speed conversions.
Innovation Solution
A soil cultivation roller with an electric drive motor and a gear arrangement, featuring a speed conversion device that spatially decouples the motor from the gearbox, allowing for a simpler gearbox design and enabling speed conversion upstream, using a belt or chain transmission for torque transfer, and optionally incorporating a planetary gear system for further reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electric roller drive motor is used to drive the soil cultivation roller, then the use of fossil fuels is avoided and environmental friendliness is improved, but the motor operates at high speed while the roller requires low speed, creating a speed mismatch that complicates the drive system
Solution Approach 1:
The patent divides the speed conversion function into two separate stages: a first speed conversion device between the motor and gearbox, and a second speed conversion device within the gearbox. This segmentation allows each converter to handle a portion of the total speed reduction ratio, simplifying the design of individual components while achieving the overall speed conversion from high-speed motor output to low-speed roller operation.
2Speed
If a gearbox is coupled directly to the electric motor for speed conversion, then the required rotational speed is achieved, but the motor and gearbox must be positioned close together, limiting spatial flexibility and increasing structural complexity
Solution Approach 1:
The patent introduces a first speed conversion device as an intermediary mechanism between the electric motor and the gearbox. This intermediate converter provides a flexible mechanical coupling that allows the motor and gearbox to be positioned at a greater distance from each other than would be possible with direct coupling, while still transmitting the necessary torque and achieving the required speed conversion.
3Speed
If a high reduction ratio gearbox is used to convert motor speed to roller speed, then the required low speed is achieved, but the gearbox structure becomes complex and bulky
Solution Approach 1:
The patent segments the total speed reduction ratio into two parts: a first reduction ratio handled by the first speed conversion device, and a second reduction ratio handled by the gearbox. By distributing the speed conversion across two separate mechanisms, the gearbox only needs to provide a partial reduction ratio, which simplifies its internal gear structure and reduces its overall size compared to a single-stage high-ratio gearbox.
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 design achieves the required rotational speed efficiently while allowing for a compact and reliable operation of the soil cultivation roller, with the gearbox and motor positioned within the roller interior, reducing complexity and maintaining operational efficiency.
Implementation Method 1
coupled by at least one belt, preferably a toothed belt, for torque transmission
Implementation Method 2
speed conversion arrangement for torque transmission
Implementation Method 3
The transmission arrangement can be designed as a planetary gear, which, in order to achieve the required speed conversion, in particular reduction, can comprise at least two planetary gear stages acting in series for torque transmission.
Implementation Method 4
at least two planetary gear stages acting in series for torque transmission
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A soil cultivation roller for a soil cultivation machine, in particular a soil compactor, comprising a roller shell (38) extending in the direction of a roller rotation axis (W) and surrounding the roller rotation axis (W), and a roller drive (42) for driving the roller shell (38) to rotate about the roller rotation axis (W), is characterized in that the roller drive (42) comprises an electric roller drive motor (44) and a gear arrangement (46), and that a motor drive element (70) of the electric roller drive motor (44) is coupled to a gear input element (82) of the gear arrangement (46) by means of a speed conversion arrangement (64) for torque transmission.