Vehicle Powertrain Sleeve Unit LSD Mechanism
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Solution Overview
Problem
Conventional powertrains for vehicles lack effective LSD function on low friction or rough roads, leading to power transmission inefficiencies and compromised driving performance.
Innovation Solution
A powertrain configuration with a first planetary gear set, differential, brake, hub, and sleeve unit that allows for five distinct restriction states of relative rotation, enabling the LSD function while minimizing power transmission loss through linear sliding of the sleeve unit, thereby ensuring high power transmission efficiency and improved driving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional differential is used, then the structure is simple, but the LSD function cannot be achieved on low friction or rough roads
Solution Approach 1:
The patent combines a planetary gear set with a differential mechanism to create an integrated LSD system. The planetary gear set (including sun gear, planet gears, and ring gear) is merged with the differential case and pinions, allowing the differential to provide limited slip functionality without requiring a completely separate LSD mechanism. This integration achieves both adaptability (LSD function) and structural simplicity.
Solution Approach 2:
The differential case serves multiple functions: it acts as the carrier for the differential pinions, provides the housing for the planetary gear set, and serves as the output member transmitting power to the driveshafts. The planetary gear set also provides multiple functions including speed reduction, torque multiplication, and limited slip differential action through the interaction of its components with the differential mechanism.
2Loss of energy
If a conventional differential is used, then the structure is simple, but power transmission efficiency is low due to power transmission loss
Solution Approach 1:
The planetary gear set is integrated directly with the differential mechanism, eliminating the need for separate power transmission paths. The planet carriers are connected to the differential case, and the ring gear is directly coupled to the differential housing, creating efficient power flow paths that minimize transmission losses while maintaining structural compactness.
3Ease of operation
If multiple restriction states are implemented, then driving performance is improved, but the device complexity increases
Solution Approach 1:
The patent employs a controllable coupling mechanism that can dynamically adjust the connection state between the planetary gear set and differential. The system provides multiple operational modes: locked state (planetary gears engaged with differential case), unlocked state (planetary gears disengaged), and intermediate states (partial engagement). This dynamic adjustability enables five distinct restriction states that optimize driving performance across different road conditions without requiring complex additional mechanisms.
Data Source
AI summary
A powertrain for a vehicle, may include a first planetary gear set having three rotation elements, with an input shaft connected to a first rotation element of the three rotation elements; an output shaft connected to a second rotation element of the first planetary gear set; a differential connected to the output shaft; a brake configured to lock or release a third rotation element of the first planetary gear set; a hub connected to the second rotation element through a clutch; and a sleeve unit restricted in rotation with respect to the hub and configured to be linearly slidable along an axial direction of the first planetary gear set to change a restriction state of relative rotation between a selected driveshaft of two driveshafts receiving power from the differential, the second rotation element, the third rotation element, and the hub by linear sliding.