Integral Differential Planetary Transmission With Sealed Lubricant Chamber
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Solution Overview
Problem
Existing planetary transmissions in motor vehicles face challenges in efficiently lubricating and cooling components due to complex lubrication systems that require separate recirculation and are not compact enough for various applications, particularly in integral differentials.
Innovation Solution
A transmission design with a planet carrier fixed to the housing, featuring a lubricant chamber sealed by the planet carrier and fixed housing part, which supplies lubricant to planetary bearings through a duct system, and includes a driving tooth system for secure installation and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate recirculating lubrication system is used, then lubrication effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent integrates the lubrication system directly into the planetary transmission structure by forming the lubricant chamber between the planet carrier and fixed housing part, eliminating the need for separate recirculating lubrication systems while maintaining effective lubrication through the sealed chamber design
Solution Approach 2:
The planet carrier serves multiple functions: it supports the planet gears, transmits torque, and simultaneously acts as a sealing element to form the lubricant chamber, reducing overall system complexity while maintaining lubrication effectiveness
2Volume of moving object
If a compact planetary transmission is designed, then space efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The lubricant chamber is formed by integrating sealing surfaces into the existing planet carrier and fixed housing part structures, achieving compactness without requiring additional sealing components that would increase manufacturing complexity
Solution Approach 2:
The sealing surfaces are designed to mate precisely between the planet carrier and fixed housing part, creating an equipotential sealing interface that maintains the lubricant chamber integrity while accommodating normal manufacturing tolerances
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 design ensures effective lubrication and cooling of planetary gears, reduces component weight and complexity, and allows for compact integration in integral differentials, enhancing torque distribution and conversion efficiency.
Implementation Method 1
A lubricant chamber 8 for supplying planetary bearings 7 with lubricant is arranged around an axis of rotation of the at least first planetary gear set 6
Implementation Method 2
This design ensures effective lubrication and cooling of planetary gears
Data Source
AI summary
A transmission for an integral differential, the transmission having a fixed housing part, and a first planetary gear set defining an axis of rotation. The first planetary gear set has a planet carrier fixed to the fixed housing part to seal a lubricant chamber spatially delimited by the planet carrier and the fixed housing part, where at least a portion of the lubricant chamber extends around the axis of rotation. The first planetary gear set further includes planetary bearings, the planetary bearings being supplied with lubricant from the lubricant chamber. Moreover, the first planetary gear set includes planet gears, each of the planet gears being rotatably mounted on the planet carrier via at least one respective bearing of the planetary bearings. Additionally, the first planetary gear set includes a sun gear and a ring gear, each meshing with the planet gears.