Three-Speed Powertrain Compact Layout High RPM Robustness
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Solution Overview
Problem
Existing powertrains for work machines and agricultural vehicles with electric motors face challenges in achieving efficient speed transmission at high RPMs, requiring robust and compact transmissions with a high number of identical parts to reduce costs and occupy minimal space.
Innovation Solution
A powertrain design featuring a three-speed transmission with a robust, compact layout utilizing identical parts, including a transmission housing, multiple shafts, gears, and clutches, where specific clutches selectively engage gears to achieve gear ratios suitable for high RPM electric motors, with all components made of heat-treated steel and supported by tapered roller bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmission is designed to handle high RPM electric motors (7200 RPM and above), then the transmission must be robust enough to endure large forces, but this increases device complexity and space requirements
Solution Approach 1:
The transmission is divided into multiple shafts (input shaft, counter shaft, intermediate shaft, output shaft) with gears mounted on specific shafts. This segmentation allows the complex power transmission requirements to be distributed across modular components, making the system more manageable and maintainable while handling high RPM forces
Solution Approach 2:
The patent employs a multi-shaft architecture that utilizes spatial arrangement in three dimensions. Gears are distributed across four different shafts positioned at different locations within the transmission housing, creating a compact yet robust structure that can handle high forces without requiring excessive linear space
2Ease of manufacture
If a transmission uses a high number of identical parts, then the cost of each part is reduced, but the device complexity increases
Solution Approach 1:
The transmission design incorporates multiple instances of similar components (gears, shafts, bearings, seals) that can be manufactured using the same processes and specifications. For example, multiple gears with identical tooth profiles and dimensions are used across different shafts, allowing for standardized manufacturing and reduced per-part cost through economies of scale
Solution Approach 2:
The patent utilizes homogeneous materials and component designs throughout the transmission. All gears are made from the same material with identical heat treatment processes, all shafts use the same bearing types and sealing configurations, creating a unified design that simplifies manufacturing, inventory management, and maintenance while reducing overall system cost
3Volume of moving object
If the transmission is arranged to occupy compact space, then the space efficiency is improved, but the robustness to endure large forces at high speeds may be compromised
Solution Approach 1:
The transmission employs a nested arrangement where gears and shafts are positioned concentrically and in close proximity. The counter shaft and intermediate shaft are arranged parallel to each other with gears meshing between them, creating a compact nested structure that maximizes space utilization while maintaining adequate clearance for force transmission
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement to pack four shafts and multiple gears into a compact housing. By distributing components across different vertical and horizontal planes within the transmission case, the design achieves high space efficiency without compromising the structural integrity or force-bearing capacity of individual components
Data Source
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AI summary
Disclosed is a powertrain (16) comprising a three speed transmission (22) and an electric motor (20).The transmission comprises six shafts (S1-S6) rotatably mounted in a housing (98). An arrangement of constantly meshing gears is provided on the shafts, consisting of seven fixedly mounted gears (G1,G3,G4,G6,G7,G8,G9) and three gears (G2,G5,G9) that can be selectively fixed for rotation with the respective shaft (S2,S3,S6) by respective clutches (C1,C2,C3).