Planetary Differential Gearbox Layout for Compact Axle Drive Assembly
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Solution Overview
Problem
Existing electrically operable axle drive trains for motor vehicles face challenges in achieving a compact design and efficient assembly, particularly due to the coaxial arrangement of pinion gears and planetary gears, which complicates the integration of components like the ring gear.
Innovation Solution
The pinion gears of the differential gear are arranged in a phased but non-coaxial configuration with the stepped planetary gears, allowing for a compact design and easier assembly by sliding the ring gear over the differential, with mechanical coupling via overlapping shafts and resistance welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If pinion gears and planetary gears are arranged coaxially, then the transmission arrangement achieves a compact design, but the assembly process becomes complicated and the ring gear integration is difficult
Solution Approach 1:
The patent applies asymmetry by deliberately arranging the pinion gears and planetary gears in a non-coaxial, phased configuration. This asymmetric arrangement resolves the contradiction by providing both compactness and assembly ease: the phased arrangement allows the ring gear to be slid over the differential during assembly, while still achieving a compact overall transmission arrangement design
2Volume of moving object
If the ring gear is integrated with the differential, then the transmission arrangement achieves compactness, but the assembly process becomes more difficult
Solution Approach 1:
The patent applies preliminary action by designing the phased arrangement of pinion and planetary gears in advance, which enables the ring gear to be easily slid over the differential during assembly. This pre-planned configuration reduces assembly time and complexity while maintaining compact integration of the ring gear with the differential
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 configuration enables a compact and efficiently assembled transmission arrangement that improves assembly ease and reduces interference, enhancing the overall performance and efficiency of the electrically operable axle drive train.
Implementation Method 1
mechanical coupling via overlapping shafts and resistance welding
Data Source
AI summary
A transmission arrangement includes a planetary transmission and a differential. The planetary transmission includes a planetary sun gear, a ring gear, a gear carrier, planetary gear shafts, and stepped planetary gears. The planetary gears are mounted in the gear carrier and engaged with the planetary sun gear and the ring gear. The differential includes first and second sun gears, balance shafts axially overlapping the planetary gear shafts, and first and second pinion gears. The first pinion gears are arranged on the balance shafts and engaged with the first sun gear, and the second pinion gears are engaged with the first pinion gears and the second sun gear. The planetary gear shafts or the balance shafts have an end face recess, or the planetary gear carrier has first receptacles for the planetary gear shafts and second receptacles for the balance shafts, with the balance shafts contacting the planetary gear shafts.