Cab Suspension Connection System with Dampening Bushing
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Solution Overview
Problem
Existing cab suspension systems in heavy vehicles face issues such as overstressing of components due to direct coupling and inadequate lubrication, leading to maintenance challenges and potential system failures, including deformation and rupture, which can result in accidents.
Innovation Solution
A connection system comprising a seat assembly and pin assembly with a U-shaped seat and cantilevered portions, incorporating a bushing with a sliding ring and dampening system, and an integrated lubrication conduit to reduce relative movements and maintain proper lubrication, allowing for easy maintenance and reducing stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pin and seat assembly connection system is used for cab suspension, then the cab can be suspended and allowed to move along different direction axes, but the movement along the pin axis may extend over the possible length of the pin, leading to direct coupling between the cab and seat assembly that causes overstresses to the fixation
Solution Approach 1:
A bushing is introduced as an intermediary element between the pin and the seat assembly. The bushing absorbs axial movements along the pin axis through relative sliding, preventing direct coupling between the cab and seat assembly. This mediator protects the fixation points from overstresses while allowing the necessary suspension movements to occur.
2Ease of operation
If grease is used for lubrication between the pin and seat assembly, then sliding movement is maintained, but the grease tends to dry and collect impurities since the space is opened towards the environment, requiring continuous maintenance
Solution Approach 1:
The lubrication system is extracted from the open environment and enclosed within a sealed bushing structure. The bushing contains the lubricant internally, preventing it from drying out and collecting impurities from the environment. This extraction of the lubrication system from environmental exposure ensures reliable continuous operation without requiring frequent maintenance.
3Productivity
If the pin and seat assembly are directly coupled, then the suspension system can function, but unforeseeable failures may occur including lack of suspension properties, deformation of suspension elements, or fatal ruptures
Solution Approach 1:
The bushing serves as a protective cushioning element that is installed beforehand between the pin and seat assembly. It cushions against excessive axial movements and prevents direct transmission of harmful forces to the suspension elements. This prior cushioning prevents unforeseeable failures such as deformation and ruptures while maintaining the suspension function.
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 solution effectively reduces stress on suspension components, enhances driver comfort by dampening movements, facilitates easy maintenance, and prevents contamination by keeping the lubrication system isolated from the environment, thus improving the reliability and longevity of the suspension system.
Implementation Method 1
a lubrication system 30 integrated in the pin 21 and configured to deliver a lubricant to a surface of the pin 21
Implementation Method 2
a dampening system 25 configured to exert a force between the bushing 22 and the cantilevered portions 19 that is opposite to the movement of the bushing 22
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Connection system (1) comprising a seat assembly (2) and a pin assembly (3) and configured for connecting these latter, the pin system (20) comprising a pin (21) rigidly carried by a support portion (2') and a bushing (22) slidably carried on the pin (21) and dampening means (25), such dampening means (25) providing a force opposite and function of the movement of the bushing (22), wherein the bushing (22) is fixedly housed within a seat (15) of the seat assembly (2).