Front Axle Turntable With Independent Wheel Drives for Pivot Steering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heavy-duty vehicle front axle suspensions, particularly those using Ackerman steering, are limited by narrow wheel cut angles, require synchronized driving forces, increase rolling resistance, and complicate steer-by-wire systems, leading to inefficiencies and reduced load capacity.
Innovation Solution
Replace Ackerman steering with a combination front axle/turntable system featuring independent electric motor driven wheel ends, allowing for wider wheel cut angles, independent driving capabilities, reduced axle count, and simplified steer-by-wire implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Ackerman steering is used, then steering control is achieved, but wheel cut angle is limited to narrow range
Solution Approach 1:
The patent divides the front axle into two independent wheel ends, each with its own electric motor and steering mechanism. This segmentation allows each wheel to be controlled independently, enabling wider wheel cut angles while maintaining steering control, directly resolving the contradiction between steering control and wheel cut angle limitation.
Solution Approach 2:
The patent replaces the traditional mechanical Ackerman steering linkage system with independent electric motors at each wheel end. This substitution eliminates the geometric constraints of mechanical linkages, allowing for significantly wider wheel cut angles while maintaining precise steering control through electronic control systems.
2Ease of operation
If Ackerman steering with linkages is used, then steering is achieved, but system complexity increases
Solution Approach 1:
The patent extracts and removes the complex mechanical linkages, tie rods, and steering knuckles from the traditional Ackerman system. By taking out these complex mechanical components and replacing them with independent electric motors at each wheel end, the system achieves steering function with significantly reduced mechanical complexity.
Solution Approach 2:
The patent substitutes the entire mechanical steering linkage system with an electrically-controlled system. Each wheel end has its own electric motor that directly controls wheel orientation, eliminating the need for complex mechanical linkages, steering arms, and tie rods, thereby reducing device complexity while maintaining steering functionality.
3Ease of operation
If synchronized driving forces are required, then Ackerman steering is maintained, but vehicle maneuverability is reduced
Solution Approach 1:
The patent segments the drive system into two independent electric motors, one at each wheel end. This segmentation allows each wheel to receive independent driving forces without synchronization requirements, enabling advanced maneuvers such as crab walking and pivot turns while maintaining steering mechanism stability through individual motor control.
Solution Approach 2:
The patent implements dynamic control where each electric motor can independently adjust its speed and torque in real-time. This dynamic capability allows the vehicle to perform various maneuvers by differentially controlling the two wheel ends, significantly enhancing vehicle maneuverability while maintaining steering stability through active electronic control.
4Strength
If conventional front axle with multiple axles is used, then load capacity is distributed, but rolling resistance increases
Solution Approach 1:
The patent merges the functions of the conventional front steering axle and turntable into a single integrated combination front axle/turntable system. This merging reduces the total number of axles while maintaining load capacity distribution through the independent electric motors, thereby reducing rolling resistance and energy loss without sacrificing load-bearing capability.
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
Enhances vehicle maneuverability, increases load capacity, reduces rolling resistance, and simplifies steering systems, improving overall vehicle performance and fuel efficiency.
Implementation Method 1
independent electric motor driven wheel ends
Implementation Method 2
combination front axle/turntable
Data Source
AI summary
A front-wheel drive electric truck cab has a front axle/turntable with independent electric motor driven wheel ends. The front axle/turntable is able to execute various extreme maneuvers including a ‘zero-cab-turn, pivot-in-place’ maneuver at least through about a 90° pivot from a straight ahead heading. For example, left wheel end is going to be accelerated smoothly to two miles per hour rearward (not forward) speed at the same time, in unison but independently, the right wheel end is going to be accelerated smoothly to two miles per hour in forward speed. Thus, the left and right wheel ends are being driven in exactly opposite directions. The following happens. The cab does not move: —not forward, not backward; nor in a forward or backward turn. The turntable/front suspension assembly pivots in place counterclockwise about its central vertical axis (at least through about a 90° pivot from a straight ahead heading).