Independent Cab Suspension Subsystems for Driver Vibration Isolation

Solution Overview

Problem

Existing cab suspension systems in vehicles often compromise driver comfort to meet safety requirements, such as reducing vibration and minimizing cab movement relative to the chassis.

Innovation Solution

The suspension system is separated into two independent subsystems: one for the outer structure and another for the inner structure of the cab, allowing for independent tuning to meet specific requirements of each structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a single suspension system is used for the entire cab, then the system is simpler and easier to manufacture, but driver comfort is reduced because safety requirements compromise vibration isolation

Engineering Contradiction:

Improvesuspension system manufacturing simplicityVSAvoidvibration load on driver

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The cab is divided into an inner structure and an outer structure, with separate suspension subsystems for each. The first suspension subsystem connects the outer structure to the chassis, while the second suspension subsystem connects the inner structure to the chassis or outer structure. This segmentation allows independent optimization of each subsystem for different requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different suspension characteristics are applied to different parts of the cab. The first subsystem (outer structure) can be tuned for stability and safety, while the second subsystem (inner structure) can be optimized for vibration isolation and driver comfort. Each subsystem has different mounting locations and can use different suspension components.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the suspension system is optimized for safety requirements, then vibration load on driver is reduced, but driver comfort is compromised due to increased cab movement relative to chassis

Engineering Contradiction:

Improvevibration load on driverVSAvoiddriver comfort

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The cab is divided into an inner structure and an outer structure, with separate suspension subsystems for each. The first suspension subsystem connects the outer structure to the chassis, while the second suspension subsystem connects the inner structure to the chassis or outer structure. This segmentation allows independent optimization of each subsystem for different requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different suspension characteristics are applied to different parts of the cab. The first subsystem (outer structure) can be tuned for stability and safety, while the second subsystem (inner structure) can be optimized for vibration isolation and driver comfort. Each subsystem has different mounting locations and can use different suspension components.

Inventive Principle:

Principle #3Local quality

3Device complexity

If a single suspension system is used for the cab, then the system structure is simpler, but modularity of the vehicle is reduced

Engineering Contradiction:

Improvesuspension system structureVSAvoidvehicle modularity

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The cab is divided into an inner structure and an outer structure, with separate suspension subsystems for each. The first suspension subsystem connects the outer structure to the chassis, while the second suspension subsystem connects the inner structure to the chassis or outer structure. This segmentation allows independent optimization of each subsystem for different requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The modular cab design with separate suspension subsystems allows the same inner structure to be used with different outer structures or different chassis configurations. The suspension mounts can be independently configured to suit different vehicle types and applications, increasing overall system versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 approach improves modularity and vibration isolation, enhancing both driver safety and comfort by allowing for optimized suspension settings for each cab structure.

Implementation Method 1

at least one of the first plurality of suspension mounts comprises an elastomeric bearing having a first mounting surface connected to the outer structure and a second mounting surface connected to the chassis

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

at least one of the second plurality of suspension mounts comprises an elastomeric bearing and a spring damper connected between the inner structure and the chassis

Methodology Applied

Scientific EffectSpring deformation: Spring

Implementation Method 3

at least one of the second plurality of suspension mounts comprises an elastomeric bearing and a spring damper connected between the inner structure and the chassis

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS20250187680A1Cab Suspension System

Publication Date: 2025.06.12 AGCO INT GMBH

AI summary

A vehicle has a cab with a cab suspension system. The vehicle includes a chassis and a cab for a driver of the vehicle mounted to the chassis. The cab has an inner structure having a floor supporting a driver seat and an outer structure having a frame surrounding the inner structure. The inner structure and the outer structure are separate and can move relative to the chassis and relative to one another. A suspension system mounting the cab to the chassis includes a first suspension subsystem connecting the outer structure to the chassis and a second suspension subsystem connecting the inner structure to the chassis.