Cab Viscous Mount Safety Loop Retention
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Solution Overview
Problem
Existing pivotal connections in work machines with tiltable cabs, which incorporate viscous mounts for vibration damping, lack effective safety mechanisms to prevent cab separation during rollover events.
Innovation Solution
A pivotal connection system featuring first and second clevises with aligned pin openings, a pivot pin, and a viscous mount with a housing, plunger, and flexible element, where the viscous mount is attached between the clevises and the pivot pin, and safety loops on the cab's mounting flange retain the pivot pin, ensuring the cab remains attached to the machine frame during rollover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a viscous mount is included in the pivotal connection between the cab and machine frame to dampen vibrations, then vibration damping performance is improved, but the risk of cab separation during rollover increases due to lack of safety mechanism
Solution Approach 1:
The pivotal connection is segmented into distinct functional components: the viscous mount for vibration damping and the safety loop with retaining structure for rollover protection. This segmentation allows each component to perform its specific function independently, resolving the contradiction between vibration damping and safety.
Solution Approach 2:
The safety loop extending from the mounting flange acts as an intermediary safety mechanism between the cab and machine frame. It provides a backup retention system that engages with the retaining structure on the pivot pin, preventing cab separation during rollover while allowing the viscous mount to function independently for vibration damping.
2Reliability
If safety loops are added to the mounting flange to prevent cab separation, then cab attachment reliability is improved, but the complexity of the pivotal connection increases
Solution Approach 1:
The safety loop is integrated into the existing mounting flange structure of the cab, and the retaining structure is incorporated into the pivot pin assembly. This merging of safety features with existing structural components adds the necessary safety function while minimizing the increase in overall device complexity.
3Reliability
If the pivot pin is made retainable by the retaining structure to prevent cab detachment, then safety during rollover is improved, but the ease of assembly and disassembly for service is reduced
Solution Approach 1:
The retaining structure and safety loop are designed to provide automatic retention during normal operation and rollover events, but allow intentional release when needed for service. The safety loop can be deliberately disengaged from the retaining structure by service personnel, providing dynamic behavior that adapts to operational vs. maintenance conditions.
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 system allows for safe tilting of the cab while maintaining vibrational isolation and damping, preventing cab detachment during rollover by securely retaining the pivot pin within the clevises, thus enhancing safety and operational stability.
Implementation Method 1
a viscous mount (84) including a housing portion (86), a plunger portion (88), and a flexible element (90) connecting the plunger portion to the housing portion
Data Source
AI summary
A work machine includes a machine frame and a cab supported from the machine frame. At least one pivotal connection between the cab and the machine frame allows the cab to be tilted relative to the machine frame. The pivotal connection includes first and second clevises fixed to the machine frame, the first and second clevises including first and second aligned pin openings, respectively. A pivot pin is received through the pin openings so that the pivot pin is pivotable relative to the machine frame. A viscous mount includes a housing portion, a plunger portion, and a flexible element connecting the plunger portion to the housing portion. The housing portion is attached to the cab, and the plunger portion is attached to the pivot pin between the first and second clevises such that the cab and the viscous mount are pivotable with the pivot pin relative to the machine frame.