Three-Stage Mixing Drum Drive for Compact Electric Motor Layout
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Solution Overview
Problem
Existing mixing drum drives for truck mixers require large electric motors due to the need for single-stage rotational speed reduction, which occupies valuable installation space and increases axial length, limiting compact design and efficiency.
Innovation Solution
A mixing drum drive with three coaxial rotational speed reduction stages, including a bearing that supports the mixing drum and absorbs chassis deformation, allowing a smaller, higher-speed electric motor with reduced weight forces, and separate lubrication chambers to minimize churning losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single-stage rotational speed reduction is used, then the motor size is reduced, but the axial length and installation space requirements increase
Solution Approach 1:
The single-stage rotational speed reduction is divided into three separate stages, each with its own gear component. This segmentation allows the total speed reduction ratio to be distributed across multiple smaller reduction steps, reducing the axial length required for each individual stage while achieving the same overall reduction effect.
Solution Approach 2:
The patent transitions from a single-stage axial arrangement to a multi-stage configuration that utilizes both axial and radial dimensions. By arranging gear components in multiple stages with some positioned radially outward from the motor shaft, the design reduces axial length while maintaining compact overall dimensions.
2Speed
If a single-stage rotational speed reduction is used, then the motor speed is reduced, but the motor power and weight increase
Solution Approach 1:
The rotational speed reduction is segmented into three stages with gear components having different tooth counts. This allows the motor to operate at higher speeds with reduced torque requirements, as the total reduction ratio is distributed across multiple smaller reduction steps rather than requiring a single high-torque low-speed motor.
3Volume of moving object
If a compact design is pursued, then installation space is reduced, but the motor configuration becomes more complex
Solution Approach 1:
Multiple gear components from different rotational speed reduction stages are merged into a single lubrication chamber. This consolidation allows all gear components to be lubricated by a single lubricant supply, simplifying the lubrication system while accommodating the complex multi-stage gear arrangement in a compact configuration.
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
Enables a compact, efficient design with a shorter, larger-diameter electric motor that follows truck mixer movements, reducing installation space requirements and improving lubricant efficiency.
Implementation Method 1
a bearing by which a component for fastening a mixing drum is rotatable... the electric motor... follows truck mixer movements
Implementation Method 2
a first rotational speed reduction stage, a second rotational speed reduction stage, a third rotational speed reduction stage... a component with a gear of the first rotational speed reduction stage is configured to be driven by the electric motor
Implementation Method 3
separate lubrication chambers to minimize churning losses
Data Source
AI summary
A mixing drum drive includes first, second, and third rotational speed reduction stages, an electric motor having a length similar to its diameter, a component for fastening the electric motor, and a bearing by which a component for fastening a mixing drum is rotatable. A component with a gear of the first rotational speed reduction stage is configured to be driven by the electric motor and a further component with a gear of the first rotational speed reduction stage drives a component with a gear of the second rotational speed reduction stage. A further component with a gear of the second rotational speed reduction stage drives a component with a gear of the third rotational speed reduction stage and a further component with a gear of the third rotational speed reduction stage drives the component for fastening the mixing drum.