Foam-Lined Shifter Lever for Truck Vibration and Noise Damping
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Solution Overview
Problem
Conventional hollow shifter levers in heavy trucks amplify noise and transmit excessive vibration from the transmission to the shift knob, making them seem loud and uncomfortable to operate.
Innovation Solution
A shifter lever with a foam liner disposed along its entire length to reduce vibration, combined with a metal shifter tube and internal conduit for air lines and electrical cables, which helps in noise reduction and vibration dampening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the shifter lever is made hollow to save weight, then the weight of the shifter lever is reduced, but noise transmission and vibration are amplified
Solution Approach 1:
The shifter lever employs a composite structure combining a hollow outer shell (for weight reduction) with an inner foam liner (for vibration and noise damping). This composite approach allows the lever to benefit from both the weight savings of a hollow design and the vibration isolation properties of foam material.
Solution Approach 2:
The foam liner material is a porous substance that absorbs and dampens vibrations and noise transmitted through the shifter lever. The porous structure of the foam allows it to effectively dissipate vibrational energy while maintaining the overall hollow configuration for weight reduction.
2Ease of manufacture
If conventional hollow shifter levers are used, then manufacturing simplicity is maintained, but excessive vibration is transmitted to the shift knob
Solution Approach 1:
The foam liner is nested within the hollow shifter lever tube, creating a concentric structure where the inner foam element is housed within the outer metal shell. This nesting approach adds vibration damping functionality while maintaining the overall simple tubular geometry that is easy to manufacture.
Solution Approach 2:
The foam liner is applied specifically in the regions where vibration damping is most needed, rather than requiring the entire shifter lever to be solid. This localized application of foam material provides vibration protection while maintaining manufacturing efficiency and weight savings.
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 foam liner effectively reduces noise and vibration transmission, enhancing the operational comfort and reducing the perceived loudness of the shifter lever.
Implementation Method 1
a liner of foam material disposed in the shifter tube and along a substantially entire length thereof for reducing vibration in the shifter tube
Implementation Method 2
Hollow shifter levers can create an echo chamber that transmits noise from the transmission
Data Source
AI summary
A shifter lever for a transmission of a motor vehicle includes a shifter tube extending between an upper end and a lower end. The lower end including an attachment member configured to be attached to the vehicle transmission for controlling an operation thereof. The shifter lever also includes a liner of foam rubber material disposed in the shifter tube and along a substantially entire length thereof for reducing vibration in the shifter tube. The liner is injected into the shifter tube and cured in place to conform to an interior surface of the shifter tube and to adhere to the interior surface of the shifter tube.