Compact Vehicle Speed Reducer Layout for High Torque Transmission
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Solution Overview
Problem
Existing vehicle transmission apparatuses have a complex structure, poor operating reliability, and low transmission efficiency due to their large axial size, which restricts the widening of vehicle aisles and complicates power transmission.
Innovation Solution
A compact vehicle transmission apparatus design featuring a speed reducer with an input gear, intermediate gears, and an output gear, where the rotational centers of these gears are not on the same line, combined with a planetary gear mechanism, simplifies the structure and enhances transmission efficiency by reducing axial width and dispersing torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If two sets of separate two-stage speed reduction transmission gears are used, then torque increasing capability is improved, but axial size increases
Solution Approach 1:
The patent combines two separate two-stage speed reduction transmission gears into a single integrated speed reducer with a compact planetary gear mechanism. This merging of separate components into one unified structure achieves the required torque multiplication (double speed reduction) while significantly reducing the axial dimension, thereby resolving the contradiction between torque capability and axial size.
Solution Approach 2:
The planetary gear mechanism employs a nested configuration where planetary gears are arranged around a central sun gear, with the planetary carrier containing multiple planetary gears that rotate on their own axes while orbiting the sun gear. This nesting of gears within a compact radial arrangement enables high torque multiplication in a small axial space.
2Force
If traditional speed reducer structure is used, then torque transmission is achieved, but structure complexity increases
Solution Approach 1:
The patent integrates multiple gear stages and the planetary mechanism into a single compact speed reducer assembly, eliminating the need for separate two-stage transmission gears. This consolidation reduces the number of components and simplifies the overall structure while maintaining effective torque transmission capability.
Solution Approach 2:
The planetary gear mechanism serves multiple functions simultaneously: it provides speed reduction, torque multiplication, and compact structural arrangement. The sun gear, planetary gears, and planetary carrier work together as a unified system that achieves both kinematic and statical functions, reducing the need for additional separate components.
3Speed
If multiple separate transmission components are used, then speed reduction ratio is achieved, but transmission efficiency decreases
Solution Approach 1:
By merging multiple gear stages into a single planetary gear mechanism, the patent reduces the number of meshing interfaces and bearing supports required. This integration minimizes energy losses at each transmission stage, thereby improving overall transmission efficiency while achieving the required speed reduction ratio.
Solution Approach 2:
The nested planetary gear arrangement allows for direct power transmission from the sun gear through planetary gears to the planetary carrier, reducing the number of intermediate transmission stages. This direct nested configuration minimizes energy loss through fewer meshing points and supports, improving transmission efficiency.
Data Source
AI summary
A vehicle transmission apparatus and a vehicle are provided in this application. The vehicle transmission apparatus includes a motor and a speed reducer. The speed reducer includes a speed reduction gear set. The speed reduction gear set includes an input gear, an intermediate gear, and an output gear. The input gear is connected to the motor. At least one intermediate gear is provided, and is meshed between the input gear and the output gear. Rotational centers of the input gear, the intermediate gear, and the output gear are not on the same line.