Lubricated Cab Mount Hinge Assembly for Wear and Noise Reduction
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Solution Overview
Problem
Commercial vehicle cab mounting assemblies experience wear and noise due to recurring movement, leading to reduced durability and increased friction noise, which is exacerbated in eco-friendly vehicles where engine noise is minimized, making noise transmission more pronounced.
Innovation Solution
A lubricatable cab mounting assembly is designed with a hinge cushion system featuring a collar, internal sleeve, and cushion rubber with spiral grooves to facilitate the flow of grease between contact points, reducing friction and wear, and including side stoppers and a sealing lip to maintain lubrication and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cab is hinged to the frame and subjected to recurring movement during traveling, then the cab mounting assembly enables the cab to be tilted for maintenance and provides vibration buffering, but wear occurs at contact portions leading to increased friction noise and reduced durability
Solution Approach 1:
A grease supply passage is provided in the collar to supply grease to the contact portion between the collar and internal sleeve. The grease acts as an intermediary lubricant that reduces direct metal-to-metal contact, thereby preventing wear and reducing friction noise while maintaining the hinge connection's durability
Solution Approach 2:
The collar is designed with a grease supply passage (porous structure) that allows grease to be delivered to the contact portions. This porous design enables continuous lubrication to reach areas that would otherwise be inaccessible, preventing wear without requiring disassembly for maintenance
2Reliability
If grease is supplied to contact portions through a grease supply passage in the collar, then wear and friction noise are reduced, but the device complexity increases due to additional lubrication components
Solution Approach 1:
The collar serves multiple functions: it acts as a structural component of the hinge connection, a mounting point for the grease supply passage, and a distribution system for lubrication. By integrating the grease supply function into the existing collar structure rather than adding a separate lubrication device, the overall device complexity is minimized while still achieving wear reduction
Solution Approach 2:
The grease supply passage is integrated into the collar structure itself, merging the lubrication function with the structural support function. This consolidation eliminates the need for separate lubrication components and simplifies the overall assembly while ensuring reliable grease delivery to contact portions
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 lubricatable cab mounting assembly effectively reduces wear and noise, enhancing durability and quietness within the vehicle by ensuring consistent lubrication at contact points, thereby improving the overall operational quietness and longevity of the assembly.
Implementation Method 1
at least one surface of an internal surface of the hinge cushion and an external surface of the collar may be provided with a groove through which oil supplied into the hinge cushion flows to an end portion of the hinge cushion
Data Source
AI summary
A cab mounting assembly connecting a cab and a frame is configured so that grease is supplied to contact portions to prevent wear and noise. The cab mounting assembly hinge-connects a frame of a vehicle and a cab in which an occupant sits. A collar is disposed outside a fixing bolt hinge-connecting the frame and the cab. A hinge cushion is fitted around the collar to buffer vibration transmitted to the cab. At least one surface of an internal surface of the hinge cushion and an external surface of the collar is provided with a groove through which oil supplied into the hinge cushion flows to an end portion of the hinge cushion.