Planetary Differential Gear Unit With Integrated Shaft Blocking
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Solution Overview
Problem
Existing gear units for vehicle powertrains require separate assemblies for torque conversion, torque distribution, and blocking functions, leading to increased component count, weight, and complexity, with no component to handle the sum of output torques, resulting in a bulky design.
Innovation Solution
A gear unit with an integral differential featuring a first and second planetary gearset connected to an input shaft and output shafts, utilizing an actuation mechanism with friction partners to create a frictionally engaging connection between the output shafts, allowing for torque conversion, distribution, and a blocking effect within a single assembly, preventing the formation of a sum torque and enabling a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate assemblies are used for torque conversion, torque distribution, and blocking functions, then each function can be performed independently, but the component count, weight, and complexity increase
Solution Approach 1:
The patent combines torque conversion, torque distribution, and blocking functions into a single integrated differential assembly. The planetary gearset simultaneously performs torque conversion and distribution, while the friction partners integrated within the same assembly provide blocking functionality. This merging eliminates the need for separate assemblies, reducing component count and simplifying the overall drivetrain architecture.
Solution Approach 2:
The differential assembly is designed as a multi-functional component that performs multiple tasks: the planetary gearset converts and distributes torque to output shafts, while the friction partners provide controllable blocking between output shafts. This universal design allows a single assembly to replace what would traditionally require multiple separate components, reducing complexity while maintaining functional independence through controlled interactions.
2Reliability
If separate assemblies are used for torque conversion, torque distribution, and blocking functions, then each function can be optimized independently, but the weight increases
Solution Approach 1:
By merging torque conversion, distribution, and blocking functions into a single differential assembly, the patent eliminates redundant structural components and fasteners that would be required to connect separate assemblies. The integrated design shares common structural elements and mounting points, significantly reducing the total weight compared to using multiple separate assemblies.
Solution Approach 2:
The multi-functional differential assembly allows each component to serve multiple purposes: the planetary gearset structure provides both torque conversion and structural support for the friction partners, while the housing serves as both a containment structure and a mounting platform. This universality reduces the total material required and thus the overall weight.
3Ease of manufacture
If separate assemblies are used for torque conversion, torque distribution, and blocking functions, then each function can be designed independently, but the overall design becomes bulky
Solution Approach 1:
The patent employs a nested arrangement where the friction partners are positioned within the same radial and axial space as the planetary gearset. The friction partners are integrated into the differential housing structure, nesting the blocking function within the existing torque conversion and distribution geometry. This nesting eliminates the need for additional external assemblies and reduces the overall volume.
Solution Approach 2:
By combining multiple functions into a single compact differential assembly, the patent achieves a space-efficient design where all components work together within a unified volume. The integrated architecture allows for optimized component placement and shared structural elements, creating a compact unit that would be impossible to achieve with separate assemblies.
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
The integral differential gear unit effectively converts and distributes input torque to output shafts in a defined ratio, reduces component count and weight, and provides a blocking effect independent of torque and speed, enabling a slim, efficient powertrain design with adjustable blocking functionality.
Implementation Method 1
an actuation mechanism (8) comprising at least a first friction partner (10a) and a second friction partner (10b), which is at least indirectly connectable to the first friction partner (10a) in frictional engagement. The friction partners (10a, 10b) are formed to generate a frictionally engaging connection between the two output shafts (5, 6) when the actuation mechanism is actuated.
Data Source
AI summary
A gear unit has a differential that comprises two planetary gearsets, a first gearset element of the first planetary gearset is connected to an input shaft and a second gearset element of the first planetary gearset is connected to a first output shaft. A third gearset element of the second planetary gearset is connected to a second output shaft. A first output torque is transmittable to the first output shaft by the first planetary gearset. A reaction torque of the first planetary gearset is transmittable to the second output shaft. Between the first output shaft and second output shaft is an actuation mechanism having a first friction partner and a second friction partner. The friction partners generate a connection between the two output shafts when the actuation mechanism is actuated.