Construction Machine Cab Guard With Nested Wiper Actuator
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Solution Overview
Problem
Construction machine cabs face challenges in maintaining an excellent field of view while adhering to ROPS standards and incorporating a wiper system that does not significantly increase the overall size of the cab.
Innovation Solution
A cab design featuring a guard with a hollow actuator housing beam that houses a parallel wiper mechanism, allowing the wiper to efficiently clean the front window without increasing the cab's size, with a blade actuator that swings link arms to reciprocate the blade along the window, and a compact structure that secures the wiper within the guard's framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a guard conforming to ROPS standards with large-sized steel pipes is used to protect the cab body, then the protection strength is improved, but the overall size of the cab significantly increases due to the large projection of the guard beyond the cab
Solution Approach 1:
The wiper motor is nested within the hollow interior space of the guard structure itself. The guard's hollow beam provides a cavity that accommodates the motor, eliminating the need for additional external space. This nesting approach allows the wiper system to be integrated into the guard without increasing the overall cab dimensions, while still maintaining the required protection strength.
2Area of stationary object
If a parallel wiper mechanism is installed to clean a large area of the front window member, then the cleaning coverage is improved, but the overall size of the cab increases due to the space required for the motor and mechanism
Solution Approach 1:
The parallel wiper motor and mechanism are nested within the hollow interior space of the guard structure. The guard's hollow beam provides a cavity that accommodates the motor, eliminating the need for additional external space. This nesting approach allows the wiper system to be integrated into the guard without increasing the overall cab dimensions, while still maintaining the required protection strength.
3Ease of operation
If a wiper motor is disposed between the cab body and the guard to drive the wiper, then the wiper function is achieved, but the overall size of the cab increases due to the projection of the guard beyond the cab
Solution Approach 1:
The wiper motor is nested within the hollow interior space of the guard structure itself. The guard's hollow beam provides a cavity that accommodates the motor, eliminating the need for additional external space. This nesting approach allows the wiper system to be integrated into the guard without increasing the overall cab dimensions, while still maintaining the required protection strength.
4Strength
If a heavy and thick guard structure is used to secure strength sufficient to protect the cab body in the event of rollover, then the protection strength is improved, but the space required for installation of the wiper motor increases, causing large projection of the guard
Solution Approach 1:
The wiper motor is nested within the hollow interior space of the guard structure itself. The guard's hollow beam provides a cavity that accommodates the motor, eliminating the need for additional external space. This nesting approach allows the wiper system to be integrated into the guard without increasing the overall cab dimensions, while still maintaining the required protection strength.
Solution Approach 2:
The guard structure serves multiple functions: it provides rollover protection strength, acts as a structural frame for the cab, and simultaneously serves as a housing for the wiper motor. By making the guard multi-functional, the design eliminates the need for separate spaces for different components, reducing the overall cab size while maintaining protection strength.
Data Source
AI summary
Provided is a compact and high-strength cab capable of securing an excellent field of view for work. The cab includes a guard protecting a cab body, and a wiper having a blade to wipe a front window member and a blade actuator for actuating the blade. The guard includes a pair of side pillars and an actuator housing beam interconnecting the side pillars and housing the blade actuator. The actuator housing beam includes a hollow beam body formed with a body opening and a front-rear partition plate partitioning the inside of the beam body into front and rear sections. The body opening allows the blade actuator to be assembled to the front-rear partition plate therethrough.