Planet Carrier Ring-Freewheel Assembly for Wheel Hub Drive
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Solution Overview
Problem
Existing planet carrier ring-freewheel assemblies for wheel hub drives are bulky and heavy due to a large number of components, which increases production costs and installation space requirements.
Innovation Solution
A compact and lightweight planet carrier ring-freewheel assembly is achieved by directly fixing the planet carrier ring to the freewheel inner or outer ring through a positive connection, eliminating the need for additional fixing means, and integrating components using methods like plastic injection molding to form a multi-part yet integral assembly with optimized torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional fixing means are used to connect planet carrier ring and freewheel ring, then connection reliability is improved, but device complexity and number of components increase
Solution Approach 1:
The planet carrier ring and freewheel ring are merged into a single integral component through injection molding, eliminating the need for separate fixing means such as screws or rivets. This combining of functions reduces the total number of components while maintaining the structural integrity and reliability of the connection.
Solution Approach 2:
The planet carrier ring is designed to serve multiple functions simultaneously: it acts as both the planet carrier structure and the freewheel mounting surface. This multi-functionality eliminates the need for additional fixing components, as the ring itself provides both structural support and secure mounting for the freewheel assembly.
2Ease of manufacture
If multiple separate components are used for planet carrier and freewheel assembly, then ease of manufacture is improved, but weight and installation space increase
Solution Approach 1:
The planet carrier ring and freewheel ring are combined into a single molded part, reducing the total weight by eliminating the weight of separate fixing components and reducing the overall material usage. The integral structure requires fewer fasteners and less material while maintaining structural strength.
Solution Approach 2:
The assembly utilizes composite construction by integrating metal components (planet carrier ring) with molded features (freewheel mounting surface), creating a hybrid structure that optimizes both weight and manufacturing efficiency. The integrated design allows for optimized material distribution throughout the single component.
3Ease of manufacture
If multiple separate components are used for planet carrier and freewheel assembly, then ease of assembly is improved, but installation space and production costs increase
Solution Approach 1:
By merging the planet carrier ring and freewheel ring into a single integral component, the assembly process is simplified as one fewer part needs to be handled, positioned, and secured. The single-component design reduces installation space requirements and eliminates the need for separate assembly steps for mounting the freewheel to the planet carrier.
Data Source
AI summary
A planet carrier ring-freewheel assembly for a transmission device including a planetary gear for a wheel hub drive for a vehicle is disclosed. The assembly includes a freewheel inner ring and/or a freewheel outer ring of a freewheel device for transmitting, dependent on a direction of rotation, a net torque provided by a drive unit of the wheel hub drive to a hub housing of the wheel hub drive, and a planet carrier ring of the planetary gear structured for supporting planet gear wheels. The planet carrier ring and the freewheel inner ring and/or the free wheel outer ring are directly fixed to one another by a positive connection in a non-rotatable and tension-resistant manner.