Electric Telehandler Layout for Cab Space and Stability
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Solution Overview
Problem
Compact telehandlers face challenges in maintaining operator comfort and efficiency due to restricted cab width, which can lead to operator fatigue and reduced safety. Additionally, the transition from diesel to electric power systems complicates weight distribution and stability, requiring significant redesign and investment in new infrastructure.
Innovation Solution
The design incorporates a compact electric drive assembly with a high-voltage electric energy storage unit located aft of the cab to improve stability and counterbalance the lifting arm. The drive assembly includes a gear train and a single electric motor that extends beneath the lifting arm, allowing for a compact and efficient machine configuration. The electric energy storage units are secured as a subassembly for efficient installation, and the valve block is positioned beneath the machine to optimize space and ease of fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the machine width is reduced to maintain compact size, then the machine can access restricted worksites and meet legislative limits, but the cab width is reduced leading to operator fatigue and reduced safety
Solution Approach 1:
The lifting arm is positioned laterally offset from the centreline to one side of the machine, utilizing the lateral dimension to create space for a wider cab without increasing the overall machine width. This dimensional rearrangement allows the cab to be positioned in the space created by the offset lifting arm, thereby maintaining compact exterior dimensions while improving operator comfort through increased cab width.
2Weight of moving object
If the machine weight is reduced to allow towing on conventional trailers, then the machine can be transported more easily, but the lifting capacity and stability are reduced
Solution Approach 1:
The machine utilizes a composite structure with a lightweight chassis and body components to reduce overall weight for trailer towability, while incorporating high-strength materials in critical load-bearing areas such as the lifting arm and hydraulic system to maintain sufficient lifting capacity and stability despite the reduced overall weight.
3Use of energy by moving object
If diesel engine is removed to transition to electric power system, then operational costs are reduced and emissions are eliminated, but weight distribution is altered affecting stability and significant redesign is required
Solution Approach 1:
The electric energy storage units are positioned aft of the cab to serve as a counterweight, compensating for the removal of the diesel engine and maintaining proper weight distribution and stability. This strategic placement of the battery assembly replicates the weight balancing function previously provided by the engine, allowing the transition to electric power without compromising machine stability.
4Ease of manufacture
If components are installed in traditional locations, then installation follows conventional procedures, but space constraints in compact machines prevent proper component placement
Solution Approach 1:
The machine is designed with modular component assemblies, such as the lifting arm housing and cab mounting sections, that can be independently manufactured and then assembled together. This segmentation allows components to be installed in non-traditional locations optimized for compact space utilization, while maintaining ease of assembly through standardized interfaces and modular construction.
Data Source
AI summary
A working machine having a front and a rear defined by the principal direction of travel, defining a fore-aft centreline, includes a body mounted on a ground-engaging structure to permit movement of the machine over the ground; an operator cab mounted on the body towards a first side of the centreline; a single lifting arm pivotably mounted towards an aft end of the body; a drive assembly comprising a first electric motor for providing power to the ground-engaging structure; and at least one high voltage electric energy storage unit, located aft of the cab. The lifting arm is located within a lifting arm housing. The lifting arm housing comprises first and second sidewalls. The first electric motor is located to a second side of the centreline, opposite the first side of the centreline. The or each electric energy storage unit is located to the cab side of the lifting arm housing.