Cam Self-Adaptive Speed Shift Hub for Automatic Gear Control
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Solution Overview
Problem
Current hubs for electric and petrol vehicles lack self-adaptive capabilities to adjust speed and torque efficiently, leading to unstable motor operation, limited range, and poor performance on complex terrain due to reliance on driver experience and lack of automatic gear shifting mechanisms.
Innovation Solution
A cam self-adaptive automatic speed shift hub that detects torque-rotation speed and driving resistance signals to maintain optimal motor output, enabling automatic gear shifting without cutting off drive force, featuring a low-gear transmission mechanism and cone-disc clutch cam assembly for efficient power transmission and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a conventional automatic gear box is adopted to solve speed shift problems, then automatic speed shifting capability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent merges the gear box functionality directly into the hub structure, integrating the speed shift mechanism with the motor and wheel assembly. This consolidation eliminates the need for a separate conventional gear box, reducing overall system complexity while maintaining automatic speed shifting capability through the cam mechanism and clutch assembly housed within the hub.
Solution Approach 2:
The patent employs a nested structure where the low-gear transmission mechanism and cam self-adaptive speed shift assembly are housed within the hub body. The low-gear drive shaft is positioned within the case body in running fit, and the clutch assembly is integrated into the drive shaft structure, creating a compact nested arrangement that reduces space requirements and simplifies the overall system architecture.
2Adaptability or versatility
If a conventional automatic gear box is installed to provide multiple gear ratios, then adaptability to different road conditions is improved, but installation space requirements increase
Solution Approach 1:
The patent combines the motor, hub, and gear box into a single integrated hub assembly, eliminating the need for separate installations. The low-gear transmission mechanism and speed shift assembly are housed within the hub body, creating a compact unit that maintains adaptability to various road conditions while minimizing the space required for installation at the driving wheel.
Solution Approach 2:
The patent utilizes the axial space within the hub body to accommodate the gear transmission mechanisms, transitioning from a radial arrangement to an axial arrangement. The low-gear drive shaft is positioned within the case body in running fit with the case body, and the cam slot mechanism operates within the axial dimension of the drive shaft, effectively utilizing three-dimensional space to reduce overall footprint.
3Device complexity
If manual control mechanical automatic speed shift mechanism is used, then device complexity is reduced, but operation stability and self-adaptive capability deteriorate
Solution Approach 1:
The patent implements a self-adaptive speed shift mechanism where the cam slot and clutch assembly automatically detect driving resistance and execute gear shifts without driver intervention. The cam slot is inserted with a cam pin that moves within the cam slot in response to driving resistance changes, automatically engaging or disengaging the clutch to shift gears. This self-service mechanism maintains operational stability by continuously adapting to road conditions without requiring manual control.
Solution Approach 2:
The patent incorporates a feedback mechanism where the cam slot mechanism responds to changes in driving resistance and motor speed, automatically adjusting the gear ratio to maintain optimal operation. The cam pin moves within the cam slot based on the rotational position and driving conditions, providing continuous feedback control that stabilizes operation across varying road conditions without requiring complex electronic control systems.
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 hub ensures optimal motor output matching vehicle conditions, improving energy efficiency, reducing emissions, and enhancing vehicle safety and comfort, while being compact and cost-effective for installation in limited spaces.
Implementation Method 1
The cam slot is inserted with a cam pin. The clutch conducts clutch/release with cooperation of the speed shift spring, cam slot and cam pin
Implementation Method 2
The clutch conducts clutch/release with cooperation of the speed shift spring, cam slot and cam pin
Implementation Method 3
the clutch includes a driving transmission part and a driven transmission part that can be clutched/released
Data Source
AI summary
A cam self-adaptive automatic speed shift hub comprises a left hub frame (7), a right hub frame (18), a case body (4), a power input device, a drive shaft (1), a wheel (14) and a brake device (20). The hub further includes a low-gear drive shaft (12), a low-gear transmission mechanism positioned on the low-gear drive shaft (12), and a cone-disc clutch cam self-adaptive speed shift assembly positioned on the drive shaft (1), in which the low-gear drive shaft (12) positioned in the case body (4) is in rotation fit with the case body (4) and in parallel with the drive shaft (1). Such a cam self-adaptive automatic speed shift hub can allow the motor/engine output power and vehicle running condition always in an optimal matching state, to achieve balance control between the vehicle driving torque and the comprehensive driving resistance.