Construction Machine Front Window Link Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing front-window opening/closing devices in construction machines face issues with increased frictional resistance due to wire connections, affecting the assisting mechanism's performance and sealing efficiency, especially when the window is closed.
Innovation Solution
A front-window opening/closing device with an upper guide roller, lower guide roller, and roller guide rail system, utilizing a link mechanism that pivots to apply tension as a pressing force when closed, reducing frictional resistance and enhancing sealing performance while maintaining the assisting mechanism's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the wire is connected to the lower end of the front window, then the assisting mechanism can pull the front window rearward, but frictional resistance between the wire and guide rails increases
Solution Approach 1:
A link mechanism is introduced as an intermediary between the wire and the front window. The link transfers the pulling force from the wire to the front window through a pivot connection, allowing the wire to pull horizontally while the link converts this force into the required rearward pulling force on the window, thereby reducing direct friction between the wire and guide rails
Solution Approach 2:
The connection system is divided into separate functional components: the wire provides tension force, the link provides force transformation through pivoting, and the guide rails provide guidance. This segmentation allows each component to perform its specific function optimally, with the wire experiencing reduced frictional resistance
2Object-affected harmful factors
If the wire is connected to the upper end of the front window, then frictional resistance is reduced, but pressing force of the front window against the cabin decreases
Solution Approach 1:
The link acts as an intermediary that connects the wire to the front window in a way that preserves both low friction and high pressing force. By pivoting about a horizontal axis, the link transforms the horizontal pulling force into a force component that presses the window against the cabin while maintaining smooth operation
Solution Approach 2:
The link mechanism introduces a rotational dimension to the force transmission. Instead of direct linear connection, the pivoting link adds a rotational degree of freedom that allows the system to achieve both reduced friction and maintained pressing force through geometric transformation of the force vector
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
Ensures improved sealing performance in the closed state while allowing smooth operation and reduced effort for opening and closing the front window by minimizing frictional resistance and optimizing the assistive force.
Implementation Method 1
one end of a wire 9 is connected to a spring 8 at the rear of a cabin 4 and the other end of the wire 9 is connected to the front window 1, and thus the force of the spring 8 pulls the front window 1 rearward
Implementation Method 2
an upper guide roller provided in an upper part of the front window, a lower guide roller provided in a lower part of the front window, a roller guide rail disposed in the cabin and guiding the upper guide roller and lower guide roller
Data Source
AI summary
An upper end of a link is attached to a roller shaft of an upper guide roller provided in an upper part of a front window for opening and closing a front opening of a cabin. A lower end of the link is provided with a wire retaining pin that moves in a wire guide rail. One end of an assist wire connected to a spring at the other end is connected to the wire retaining pin. Thus, in a window-closed state, tension acts on the front window as a pressing force for pressing the front window forward, and when the front window is to be opened, the tension acts through the link on the front window as an assisting force.