Tilt Frame Spring Damping for High-Speed Vehicle Stability
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Solution Overview
Problem
Existing vehicle designs experience instability and reduced subjective driving safety at high speeds due to tilting frames oscillating around the vertical zero position, affecting the driver's perception of safety.
Innovation Solution
The implementation of linearly acting spring damper systems between the base frame and the tilt frame to reduce pendulum oscillations, comprising spring and hydraulic damper units arranged symmetrically on both sides, which counteract moments and provide damping forces to stabilize the tilt frame during straight-ahead driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tilt frame is allowed to tilt relative to the base frame to enable driver comfort during cornering, then the driver can lie down in the curve and counteract centrifugal force, but the tilt frame oscillates around the vertical zero position during straight-ahead driving at high speeds, reducing driving stability and subjective safety
Solution Approach 1:
The patent applies dynamics by making the tilt frame movable relative to the base frame through a controlled oscillation system. The tilt frame can dynamically adjust its position to accommodate driver comfort during cornering while the control system actively manages oscillations during straight-ahead driving to maintain stability. This dynamic approach allows the system to adapt to different driving conditions rather than being fixed in one state.
Solution Approach 2:
The patent changes the parameter of tilt frame oscillation by introducing active control through actuators and control units. The system monitors the tilt frame's position and actively adjusts it to minimize unwanted oscillations around the vertical zero position during high-speed straight-ahead driving, thereby transforming the stability characteristic from passive to actively controlled.
2Stability of the object's composition
If linearly acting spring damper systems are added between the base frame and tilt frame to reduce pendulum oscillations, then driving stability is improved, but the device complexity increases
Solution Approach 1:
The patent employs pneumatic or hydraulic spring damper units to provide active control of the tilt frame's oscillations. These fluid-based actuating elements can generate the necessary forces to counteract pendulum oscillations during straight-ahead driving while being compact and controllable. The use of pneumatic/hydraulic systems allows for precise control of the damping characteristics without requiring overly complex mechanical linkages.
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
This solution enhances driving stability and subjective safety by minimizing the tilting frame's oscillations, ensuring a more stable and secure driving experience at high speeds.
Implementation Method 1
The implementation of linearly acting spring damper systems between the base frame and the tilt frame to reduce pendulum oscillations
Implementation Method 2
comprising spring and hydraulic damper units arranged symmetrically on both sides
Implementation Method 3
hydraulic damper units arranged symmetrically on both sides, which counteract moments and provide damping forces
Data Source
AI summary
A vehicle with a base frame to which at least two sprung suspensions, in particular sprung wheel suspensions, for driven, non-driven, steerable or non-steerable contact elements, for example wheels, are attached which can be steered by means of a steering knuckle and are located on both sides of the longitudinal direction of travel, in each case transversely to the direction of travel, a tilt frame, tiltable in a tilt axis with respect to the base frame. A steering tube is rotatably attached to the tilt frame in the steering axis and automatically tilts with the tilt frame, at least one track rod connected to the track rod actuating element, and a linear or rotary track rod actuating element rotatable over a guide element. The track rod actuating element is displaced by tilting the tilt frame about the tilt axis and independently thereof by rotating the steering tube about the steering axis in such a way that the steerable contact element is given a steering movement by the track rod actuating element by means of the at least one track rod and no substantial change in the camber of the contact elements takes place during cornering, wherein the vehicle comprises at least one spring damper system which is suitable and provided for reducing a pendulum tilt of a tilt frame about the vertical zero position.