Dual-Motor Powertrain Layout for Compact Electric Work Machines
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Solution Overview
Problem
Existing working machines driven by internal combustion engines require significant reconfiguration to integrate electric motors, which is costly and inefficient, especially when aiming for climate-friendly electrically driven construction machinery.
Innovation Solution
A powertrain arrangement featuring two electric motors and a transmission, housed within a frame component that includes a rear axle casing section and a top-side frame section, allowing for compact and accessible installation without altering existing components, enabling efficient conversion of electrical power to mechanical torque for both driving and auxiliary functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electric motors are integrated into working machines previously optimized for internal combustion engines, then climate protection and electrical drive functionality are improved, but device complexity and modification costs increase
Solution Approach 1:
The frame component's receiving space is designed to accommodate multiple components (first electric motor, second electric motor, and transmission) in a multi-functional arrangement. The same receiving space structure serves both structural support and component housing functions, reducing the need for additional specialized housings or mounting structures.
Solution Approach 2:
The patent combines the housing of the electric motors and transmission within a single frame component structure. The rear axle casing section and top-side frame section are integrated into one unified frame component that forms the receiving space, merging what could have been separate housing elements into a single structural unit.
2Ease of manufacture
If electric motors are integrated into existing working machine structures, then conversion costs are reduced, but installation space availability worsens
Solution Approach 1:
The first and second electric motors are arranged next to each other in the transverse direction and at least partially at the same level in the vertical direction, utilizing three-dimensional space efficiently. This spatial arrangement allows compact positioning of multiple motors within the available receiving space without requiring excessive horizontal or vertical clearance.
Solution Approach 2:
The electric motors and transmission are nested within the receiving space formed by the frame component. The rear axle casing section and top-side frame section create a nested enclosure that houses the powertrain components, maximizing space utilization within the existing machine structure.
3Area of stationary object
If electric motors are positioned for compact installation, then installation space efficiency is improved, but accessibility for maintenance deteriorates
Solution Approach 1:
The frame component is segmented into distinct sections (rear axle casing section and top-side frame section) that form the receiving space. This segmentation allows for potential modular access to the components housed within, where specific sections could be accessed or removed to reach the electric motors and transmission for maintenance while maintaining overall compact integration.
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 solution allows for the seamless integration of electric drive systems into machines previously optimized for internal combustion engines, maintaining efficiency and reducing the need for extensive modifications, thus enabling cost-effective conversion to electric powertrains.
Implementation Method 1
a first electric motor (34), a second electric motor (36), wherein the first electric motor (34) and the second electric motor (36) are connected to the transmission (40) for transmitting torque
Implementation Method 2
The frame component (38) has a rear axle casing section (58), which is configured to rotatably bear a universal-joint shaft connected thereto, the universal-joint shaft connecting the transmission (40) to a rear axle of the working machine
Data Source
AI summary
A powertrain arrangement of a working machine, including a first and second electric motor, frame component, and transmission, the first and second electric motor being connected to the transmission for transmitting torque. The frame component forms a receiving space, in which the first and second electric motor and the transmission are accommodated. The frame component has a rear axle casing section configured to rotatably bear a universal-joint shaft connecting the transmission to a rear axle. The frame component has a top-side frame section, which is arranged adjacent to a cab floor in a vertical direction. The first and second electric motor are arranged next to each other in a transverse direction and at least partially at a same level in the vertical direction. The first and second electric motor are arranged above the rear axle casing section and below the top-side frame section in the vertical direction.