Cab Support Bracket Integrating Movement Limiting Mechanism
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Solution Overview
Problem
Conventional cab supporting apparatuses for work machines, such as crawler dozers, have complex structures due to separate dampers and movement limiting mechanisms, leading to increased costs and assembly difficulties, while simplifying the structure results in a wide installation space requirement.
Innovation Solution
A cab supporting apparatus that integrates the movement limiting mechanism with the bracket, using a lower limiting portion fixed by welding or bolts, and an upper limiting portion formed in a plate member, allowing for a compact and simplified structure by reducing the number of parts and using plasma arc cutting for fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the movement limiting mechanism is installed in each of the dampers, then the cab frame movement is limited within a predetermined range, but the structure of the damper becomes complicated and the cost is significantly increased
Solution Approach 1:
The movement limiting function is segmented from the damper structure. Instead of integrating the movement limiting mechanism within each damper, the patent separates it into an independent bracket-based system, allowing the damper to focus solely on vibration damping while the bracket handles movement limitation.
Solution Approach 2:
An intermediate bracket structure is introduced as a mediator between the cab frame and the movement limiting mechanism. The bracket serves as a separate component that provides mounting points for movement limiters, eliminating the need to complicate the damper internal structure.
2Device complexity
If the movement limiting mechanism is provided independently from the damper, then the damper structure is simplified and downsized, but the structure of the entire cab supporting apparatus becomes complicated and a wide installing space is required
Solution Approach 1:
The movement limiting mechanism is merged with the bracket structure rather than being a completely separate assembly. The brackets are positioned to utilize the same installation space as the dampers, combining the support and movement limitation functions in a compact arrangement.
Solution Approach 2:
The bracket structure serves multiple functions: it provides mounting support for the dampers and simultaneously houses the movement limiting mechanisms. This multi-functionality reduces the overall number of components and minimizes the installation space required.
3Reliability
If multiple members are used in the movement limiting mechanism, then the movement limitation function is achieved, but the number of parts is increased and assembly becomes troublesome
Solution Approach 1:
The movement limiting function is extracted as a separate, simplified mechanism mounted on the bracket rather than being integrated into the damper. This extraction allows for a cleaner design with fewer interacting parts and simpler assembly procedures.
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
This approach simplifies the cab supporting apparatus structure, reduces manufacturing costs, and allows for easier assembly and disassembly, while effectively limiting cab frame movement within predetermined ranges to manage vibrations and loads during operation.
Implementation Method 1
a damper is interposed between each of the brackets and the cab frame, and a vibration and an impact transmitted to the cab frame are damped by the damper
Implementation Method 2
a plate member is cut with a plasma arc cutting machine
Data Source
AI summary
A cab frame (14) is supported on brackets (12, 13) provided at a plurality of positions of a vehicle body frame (11) with dampers (15). Movement limiting mechanisms (30) for limiting a movement at least in a vertical direction of the cab frame (14) are provided between the brackets (12, 13) and the cab frame (14). Further, the movement limiting mechanisms (30) are provided at least at two positions. Each movement limiting mechanism (30) includes a lower limiting portion (31) arranged close to the brackets (12, 13) and constituted by a plate member, and an upper limiting portion (32) arranged close to the cab frame (14) and constituted by a plate member in the same manner. The lower limiting portion (31) is integrally structured with the brackets (12, 13). Recesses (33, 34) are formed in a side edge of at least one of the lower limiting portion (31) and the upper limiting portion (32), and the limiting portion in the other limiting portion is positioned within the recesses (33, 34). Accordingly, in the cab supporting apparatus of a work machine, the movement limiting mechanism (30) is arranged by using the brackets (12, 13) for supporting the cab frame (14). Therefore, it is possible to simplify the structure of the cab supporting apparatus by reducing the number of the parts, and it is possible to make the structure compact. Accordingly, even in a compact work machine, the cab supporting apparatus is easily mounted.