Triangular Gear-Center Dual Transmission for Low Power Loss
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Solution Overview
Problem
Dual transmissions in electric powertrains face challenges in optimizing power flow and efficiency due to limited electrical storage capacity, requiring minimal energy consumption for auxiliary units and power losses, while maintaining compactness and environmental sustainability.
Innovation Solution
The dual transmission is designed with a unique arrangement of gear centers forming a triangular configuration, where the middle axle is positioned above the reference plane, allowing for independent torque transmission units, reduced tilting moments, and low power losses, with spur gear pairings and freewheel bodies to compensate for transverse forces, and a vent channel system for efficient lubrication and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the gear centers are arranged in a triangular configuration with the middle axle above the reference plane, then power flow efficiency is enhanced and tilting moments are reduced, but the device complexity increases due to the non-standard arrangement
Solution Approach 1:
The patent applies asymmetry by positioning the middle axle above the reference plane instead of on it, creating a triangular arrangement of gear centers. This asymmetric configuration optimizes power flow paths and reduces tilting moments on shafts, directly addressing the energy loss issue while accepting increased structural complexity as a trade-off.
Solution Approach 2:
The invention moves the middle axle from the reference plane (2D arrangement) to a position above it (3D arrangement), creating a triangular configuration in three-dimensional space. This dimensional change allows for optimized power flow and reduced tilting moments by utilizing the vertical dimension for mechanical advantage.
2Stability of the object's composition
If a dual transmission with two independent torque transmission units is used, then cornering stability is improved through torque-vectoring, but the installation space requirement increases
Solution Approach 1:
The patent merges two independent torque transmission units into a single dual transmission system with a shared case and common structural elements. The triangular gear center arrangement and common vent channel system allow both torque transmission units to coexist in a compact configuration, maintaining torque-vectoring capability for cornering stability while reducing overall installation space.
Solution Approach 2:
The transmission case and supporting structures serve multiple functions: they house both torque transmission units, provide structural support, contain the lubrication system, and manage ventilation for both units. This multi-functionality reduces the total installation space required while maintaining the dual independent torque transmission capability.
3Ease of manufacture
If traditional gear arrangements are used, then the manufacturing process is simpler, but transverse forces are not compensated and power losses increase
Solution Approach 1:
The patent applies local quality by strategically positioning the middle axle above the reference plane at a specific height that creates the triangular configuration. This localized positional adjustment in the gear arrangement optimizes force distribution and compensation without requiring changes to the fundamental manufacturing processes of the gear components themselves.
Data Source
AI summary
A dual transmission with input shafts, output shafts, a transmission case and two separate single transmissions arranged in the transmission case is described. Each single transmission is a two-stage spur gear transmission with three positions for gear centers. A first position is occupied by an input shaft and a second position by an output shaft. A third position is for a middle stationary axle fixed to the transmission case. The three positions define a triangular arrangement having a first side defined by a distance between the first position and the second position, a second side defined by a distance between the first position and the third position, and a third side defined by a distance between the second position and the third position. The second side and the third side form respective angles with the first side. At least one of these angles has a value ranging between 5° and 70°.