Wheel Hub Drive Assembly Torque Amplification
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Solution Overview
Problem
Existing wheel hub drive systems face high dynamic demands on brakes, large component dimensions, limited space for reduction gear due to electric machine chamber size, and excessive stress on support bearings, affecting reliability and durability.
Innovation Solution
A wheel hub drive unit design where the reduction gear is positioned between the brake and the wheel hub mounting surface, with the electric machine chamber and support bearing arranged to reduce the size of the electric machine chamber and relocate the support bearing closer to the wheel hub's central axis, allowing for increased space for the reduction gear and reduced linear speed of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake is designed to provide sufficient maximum output torque for all braking requirements, then the braking performance is improved, but the dynamic demands on the brake increase and component dimensions become large
Solution Approach 1:
The patent combines the reduction gear and brake into a single integrated assembly where the reduction gear is positioned between the electric machine and the brake. This merging allows the reduction gear to amplify the brake's output torque, enabling the brake to meet all braking requirements without requiring excessively large component dimensions or high dynamic demands.
2Reliability
If the support bearing is arranged in the electric machine chamber close to the inner peripheral surface of the wheel hub, then the electric machine chamber can be sealed, but the linear speed of the support bearing becomes too high during vehicle operation
Solution Approach 1:
The patent extracts the support bearing from the electric machine chamber and relocates it to the housing. This separation allows the electric machine chamber to maintain its sealed configuration while the support bearing operates at a lower linear speed position, resolving the contradiction between sealing requirements and bearing speed limitations.
3Reliability
If the support bearing is positioned farther from the wheel hub central axis to allow electric machine chamber sealing, then the electric machine chamber can be sealed, but the space available for the reduction gear chamber decreases
Solution Approach 1:
By extracting the support bearing from the electric machine chamber and relocating it to the housing, the patent frees up space within the electric machine chamber. This enables adequate space allocation for the reduction gear chamber while maintaining the sealed configuration of the electric machine chamber, thus resolving the space contradiction.
4Speed
If the support bearing is arranged closer to the wheel hub central axis after relocation, then the linear speed of the support bearing is reduced, but the arrangement requires careful positioning in the housing
Solution Approach 1:
The patent applies local quality by creating a specific bearing arrangement structure within the housing that accommodates the relocated support bearing. The housing includes a bearing arrangement structure with a bearing seat positioned to receive the support bearing at an optimal location closer to the wheel hub central axis, reducing linear speed while maintaining ease of assembly through the structured design.
Data Source
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AI summary
A wheel hub drive unit, wherein a housing (500) arranged in the wheel hub (110) forms a sealed electric motor chamber equipped with an electric drive motor (200), a sealed reduction gear chamber equipped with a reduction gear (400), and a brake chamber connected to the outside environment and equipped with a brake (300), wherein the reduction gear chamber and the brake chamber are distributed along an axial direction away from a wheel hub mounting surface; the electric motor chamber comprises a base body (Q1) arranged close to the inner circumferential surface of the wheel hub and a passage (Q2) extending in the direction towards the central axis of the wheel hub;The output end of the electric drive motor is guided through the passage and then extended out of the electric motor chamber, simultaneously connected to the input end of the reduction gear and the output end of the brake, with the output end of the reduction gear being connected to the wheel hub; and a support bearing is arranged in the housing (500) between a position near the radial inner end of the passage and the rotor mount, which is used to support the rotor mount (230). The reduction gear (400) can simultaneously amplify the drive torque as well as the braking torque and reduces the dynamic requirements on the electric drive motor and the brake; and the closer proximity of the support bearing to the central axis of the wheel hub reduces the requirements for its reliability and durability.