Sprung Cab Workplace Vibration Isolation via Bellows
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Solution Overview
Problem
Modern commercial vehicles face limitations in providing sufficient living space for drivers during rest phases due to chassis length constraints and inadequate vibration decoupling from the chassis, leading to discomfort and increased complexity in design.
Innovation Solution
The driver's cab is divided into a sprung driver's workplace area and an unsprung living area, connected by a circumferential bellows, allowing horizontal and vertical displacement of the workplace area relative to the living area, which is mounted rigidly on the chassis for improved vibration decoupling and increased space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the driver's cab is designed as a single rigid structure mounted on springs, then vibration decoupling is achieved, but the living space is limited due to chassis length constraints
Solution Approach 1:
The driver's cab is divided into two separate areas: a driver's workplace area mounted on springs for vibration decoupling, and a living area mounted rigidly on the chassis for maximum space utilization. This segmentation allows each area to have optimized mounting characteristics without compromising the other.
Solution Approach 2:
The bellows connection allows the driver's workplace area to be displaced horizontally and vertically relative to the living area, creating additional spatial dimensions for optimization while maintaining functional separation between the two areas.
2Object-affected harmful factors
If the entire driver's cab is mounted on springs, then vibration decoupling is improved, but the structural complexity and weight increase
Solution Approach 1:
Spring mounting is applied locally only to the driver's workplace area where vibration isolation is critical for driver comfort, while the living area uses rigid mounting to reduce overall system weight and complexity. This localized application optimizes vibration protection without unnecessarily increasing weight throughout the entire cab structure.
3Volume of moving object
If the driver's cab dimensions are increased for long-distance transport, then living space is improved, but the vehicle exceeds chassis length limitations and cargo volume is reduced
Solution Approach 1:
The driver's workplace area is designed with dynamic displacement capability, allowing it to move horizontally and vertically relative to the living area through the bellows connection. This dynamic configuration enables space optimization without permanently increasing the vehicle's external dimensions.
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 design enhances vibration isolation, provides more comfortable living space, reduces weight, and simplifies the structural requirements of the cab, enabling cost-effective and space-efficient solutions while maintaining legal vehicle dimensions.
Implementation Method 1
the driver's workplace area, which is sprung relative to the chassis frame
Implementation Method 2
Driver's cabs of today's commercial vehicles are shock and vibration dampened compared to the chassis via spring-damper legs
Implementation Method 3
The driver's cab outer walls of the two areas, which face one another, are connected to one another by a circumferential, stretchable bellows
Data Source
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AI summary
The vehicle has a driving cab (1) accommodating living area (3) and driver work place area (2) including functions belonging to driving work and including a driver seat. Driving cab outer walls (4) of the areas are aligned against each other and connected with each other by circulating flexible bellows (5). The driver work place area suspended opposite to a chassis frame (6) is arranged opposite to the living area in a horizontally and/or vertically displaceable manner. The living area of the driving cab is suspended on the chassis frame.