Work Vehicle Frame Isolation System for Noise and Vibration Reduction
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Solution Overview
Problem
Bulldozers experience significant noise and vibration during operation, which are inadequately isolated from the operator's cab, leading to discomfort and reduced productivity due to the lack of effective sound and vibration isolation between the machine's mechanisms and the main frame.
Innovation Solution
An isolation system is introduced between the rear and front frames of the work vehicle, comprising isolating devices configured to support longitudinal and vertical forces, force limiting devices to manage applied forces, and motion limiting torque rods to restrict lateral movement, allowing the rear frame to support a greater portion of the total force and reducing noise and vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the vehicle body is designed to withstand heavy loads from mechanisms, then structural strength is improved, but noise and vibration transmission to the operator increases
Solution Approach 1:
The vehicle body is divided into separate segments (front frame, rear frame, cab) that are not rigidly connected. The rear frame and cab are isolated from the front frame through which heavy loads are transmitted, creating distinct load paths that prevent vibration and noise transmission to the operator compartment.
Solution Approach 2:
Isolation devices are introduced as intermediary elements between the rear frame and the cab. These devices act as mediators that allow the rear frame to support heavy loads while preventing the transmission of noise and vibration to the cab where the operator sits.
2Stability of the object's composition
If mechanisms are rigidly attached to the vehicle body, then structural stability is improved, but operator comfort deteriorates due to increased vibration
Solution Approach 1:
The vehicle body is segmented into independent structural units (front frame, rear frame, cab) connected through isolation devices. This segmentation allows each segment to maintain its structural stability for supporting mechanisms while preventing the propagation of vibrations to the operator compartment.
Solution Approach 2:
The cab is extracted and isolated from the main vehicle body structure. By separating the operator compartment from the load-bearing frame through isolation devices, the harmful vibrations are excluded from the operator environment while the frame maintains its stability for supporting mechanisms.
3Object-affected harmful factors
If sound and vibration isolation is added between mechanisms and the main frame, then operator comfort is improved, but device complexity increases
Solution Approach 1:
The isolation devices perform multiple functions simultaneously: they support the weight of the rear frame, allow relative movement between frames, and isolate noise and vibration. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The isolation devices utilize changes in material parameters (elasticity, damping characteristics) to achieve vibration and noise isolation. By selecting materials with appropriate dynamic properties, effective isolation is achieved without requiring complex mechanical structures.
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 isolation system effectively reduces noise and vibration, enhancing operator comfort and productivity by decoupling the forces and movements between the rear and front frames, thereby improving the operational experience.
Implementation Method 1
at least one isolating device positioned between the rear frame and the front frame, the at least one isolating device configured to support at least one of a longitudinal force or a vertical force from a total force applied to the work vehicle during operation of the work vehicle
Implementation Method 2
a motion limiting torque rod attached to the rear frame and the front frame, the motion limiting torque rod configured to prevent movement of the rear frame in the lateral direction
Data Source
AI summary
An isolation system for a vehicle having a rear frame attached to a front frame. The rear frame supports a greater portion of a total force applied to the vehicle than the front frame. The isolation system includes at least one isolating device positioned between the rear and front frames. The isolating device supports a portion of the total force applied to the vehicle in a direction in which the isolating devices is positioned. The isolation system includes a force limiting device positioned near the isolating device and a motion limiting torque rod attached to the rear and front frames. The force limiting device limits the amount of load applied to the isolating device above a maximum load. The motion limiting torque rod prevents or limits movement of the rear frame relative to the front frame in the direction in which it is aligned.