Track Vehicle Running Device Spring Constant Equalization
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Solution Overview
Problem
Conventional running devices for track-laying vehicles experience high impact and uncomfortable falling height when traversing raised surfaces due to uneven distribution of apparent spring constant and maximum oscillation angles, leading to operator discomfort.
Innovation Solution
A running device configuration with a double-bogie system that includes a spring constant equalizing unit, increasing the maximum oscillation angle of the second arm beyond the crossing angle of connecting links, and modifying abutment surfaces to evenly distribute the apparent spring constant, reducing the falling height and impact during raised surface crossings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a double-bogie device with elastic members is used to improve ride quality, then impact absorption is improved, but apparent spring constant becomes unevenly distributed causing high impact at specific positions
Solution Approach 1:
The patent applies local quality by providing different oscillation angles for different arms (first arm and second arm) within the same double-bogie device. The first arm has a first oscillation angle while the second arm has a second oscillation angle, allowing each position to have optimized spring constant characteristics for its specific load-bearing role, thereby evenly distributing apparent spring constant across the crawler length.
Solution Approach 2:
The patent changes the oscillation angle parameter of the arms to resolve the contradiction. By setting different oscillation angles for the first and second arms, and by adjusting these angles based on the position of lower track rollers, the apparent spring constant is evenly distributed across the crawler, preventing high impact at specific positions while maintaining overall impact absorption.
2Ease of operation
If maximum oscillation angle is increased to reduce falling height, then ride quality is improved, but device complexity increases due to additional equalization mechanisms
Solution Approach 1:
The patent applies dynamics by making the oscillation angles of the arms variable rather than fixed. The first arm and second arm can oscillate at different angles depending on the operating conditions and position of lower track rollers, allowing the system to adaptively optimize ride quality without requiring complex additional equalization mechanisms.
Solution Approach 2:
The patent achieves local quality differentiation through the first and second arms having different oscillation angles. This allows the system to optimize ride quality at different positions along the crawler independently, reducing the need for complex global equalization mechanisms while maintaining good ride quality throughout.
3Object-affected harmful factors
If elastic members are added to absorb impact, then impact absorption is improved, but device complexity increases
Solution Approach 1:
The patent merges the impact absorption function with the existing arm structure of the double-bogie device. The elastic members are integrated into the arm assembly, allowing the arms to both support the crawler and absorb impact simultaneously, rather than adding separate impact absorption systems that would increase device complexity.
Solution Approach 2:
The arms of the double-bogie device are given multiple functions: they serve as structural support elements, enable oscillation for impact absorption, and provide the necessary spring constant distribution. By making the arms multi-functional, the patent avoids adding separate dedicated impact absorption components, thereby reducing overall device complexity.
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 the falling height and impact felt by the operator while maintaining good ride quality by evenly distributing the vehicle body load and increasing the oscillation angle, thus alleviating the fear of falling and discomfort.
Implementation Method 1
Elastic members 34a and 34b are fixed in an abutment portion between a leading-end upper portion of the first arm 31 and the lower portion of the track frame 1. The abutment of the elastic members 34a and 34b restricts the upward turning of the first arm 31 while absorbing impacts of the first and second lower track rollers 11 and 12 when the running device runs on or runs over the raised portion.
Data Source
AI summary
There is provided a running device for track-laying vehicle, which can resolve a feeling of fear of falling height in a leading end portion of a crawler while relax a large impact when the crawler runs over a raised contact area. The running device includes a spring constant equalizing unit that equalizes an apparent spring constant of a second arm of lower track roller bogie device over a total length. The apparent spring constant is generated in maximum reverse camber of the crawler. The spring constant equalizing unit increases an oscillation angle α of the second arm that can abut on the first arm in the maximum reverse camber of the crawler such that the oscillation angle α of the second arm is larger than a crossing angle β of the connecting link. Desirably the increased maximum oscillation angle of the second arm is 1.3-2.0 times the crossing angle β.