Exhaust Support Assembly Isolating Cab Vibration
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Solution Overview
Problem
Existing exhaust system support assemblies for semi-trailer trucks restrict cab movement during jounce and rebound, leading to potential detachment and increased vibration and noise due to inefficient mounting and direct transmission of vibrations.
Innovation Solution
An exhaust system support assembly featuring an isolation pin and resilient members between the exhaust member mount assembly and pivot assembly, allowing independent movement of the truck cab and exhaust stack, while reducing vibrations through a spherical mount bushing assembly and U-bolts for secure coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exhaust system support assembly restricts cab movement during jounce and rebound, then the connection between exhaust stack and cab is maintained, but the cab movement is restricted and the assembly may be torn away when cab moves independently
Solution Approach 1:
The exhaust system support assembly transitions from a static rigid connection to a dynamic system that adapts to cab movement. The spherical mount bushing assembly allows the isolation pin to rotate and pivot, enabling the exhaust stack to move independently with the cab while maintaining connection. This dynamic capability resolves the contradiction by allowing both connection reliability and cab movement freedom.
Solution Approach 2:
The resilient members (rubber bushes) change their mechanical properties based on loading conditions. Under normal vibration, they provide flexible isolation. During extreme jounce and rebound, they deform to accommodate large movements while maintaining connection. This parameter change allows the system to maintain reliability while permitting necessary movement.
2Strength
If the exhaust system support assembly uses rigid connection, then structural strength is maintained, but vibration and noise are transmitted directly to the exhaust stack connection
Solution Approach 1:
The spherical mount bushing assembly acts as an intermediary between the rigid exhaust stack and the moving cab. This intermediate component absorbs and isolates vibrations and noises while maintaining the structural connection. The resilient members within the bushing specifically target and dampen harmful vibrations, resolving the contradiction between strength and vibration transmission.
Solution Approach 2:
The vibration and noise isolation function is extracted from the primary structural connection. By separating the structural support function (handled by the isolation pin and mount brackets) from the vibration isolation function (handled by the spherical mount bushing assembly with resilient members), the system achieves both structural strength and vibration reduction simultaneously.
3Object-affected harmful factors
If the exhaust system support assembly allows independent movement, then vibration isolation is improved, but the connection may loosen and fail over time
Solution Approach 1:
The resilient members (rubber bushes) are pre-installed in the spherical mount bushing assembly to cushion against vibrations and movements before they can cause damage. This beforehand cushioning protects the connection from loosening and failing over time, while still allowing the necessary independent movement for vibration isolation.
Solution Approach 2:
The spherical mount bushing assembly uses composite construction combining rigid components (isolation pin, mount brackets) with flexible resilient members (rubber bushes). This composite structure allows the rigid parts to maintain connection integrity while the flexible parts provide vibration isolation, preventing connection loosening and failure over time.
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 assembly enables independent movement of the truck cab and exhaust stack, reducing vibration and noise, and providing a durable, long-lasting solution by effectively isolating vibrations and maintaining secure connections.
Implementation Method 1
at least one resilient member disposed between the exhaust member mount assembly and the isolation pin
Implementation Method 2
at least one resilient member disposed between the exhaust member mount assembly and the isolation pin
Implementation Method 3
reducing vibration and noise generated by the moving components of the assembly
Data Source
AI summary
The present disclosure provides an exhaust system support assembly (10) for coupling an exhaust member (F) to a vehicle (A). The exhaust system support assembly (10) includes an exhaust member mount assembly (52) couplable to the exhaust member (F), an isolation pin (32) received within at least a portion of the exhaust member mount assembly (52), and at least one resilient member (44,46) disposed between the exhaust member mount assembly (52) and the isolation pin (32). The exhaust system support assembly (10) further includes a pivot assembly (16) couplable to the vehicle (A), wherein the pivot assembly (16) slidably and rotatably receives the isolation pin (32).