Hydraulic Coupler-Assembly for Front-End Loader Bucket Attachment
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Solution Overview
Problem
Front-end loaders face challenges in securely attaching and detaching buckets due to inadequate coupling mechanisms, which can lead to instability and safety issues during operation, especially under abusive conditions or hydraulic pressure failures.
Innovation Solution
A coupler-assembly with a robust slider-block and hydraulic system that ensures secure attachment of the bucket through a tenon-mortise engagement mechanism, using hydraulic pressure to maintain tightness and a lock-bolt system to prevent detachment, even under violent forces or hydraulic failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple coupling mechanism is used to attach the bucket to the articulating arm, then the device complexity is reduced and ease of manufacture is improved, but the reliability and security of attachment deteriorate under abusive conditions or hydraulic pressure failures
Solution Approach 1:
The lock-bolt is pre-positioned in a retracted state by hydraulic pressure, and the tenon is pre-aligned with the mortise. When attachment is needed, the hydraulic system automatically advances the lock-bolt into the lock-slot and the tenon into the mortise before full engagement, ensuring secure attachment is prepared in advance rather than reacting to failure conditions
Solution Approach 2:
The coupling mechanism incorporates a lock-bolt and lock-slot system that engages before full operational loads are applied. The tenon-mortise joint is pre-engaged with the lock-bolt securing it in place, providing a cushion of security against abusive conditions or hydraulic failures before they occur
2Reliability
If a robust coupling mechanism with lock-bolt and tenon-mortise engagement is used, then the reliability and strength of attachment are improved, but the ease of operation for attaching and detaching the bucket deteriorates
Solution Approach 1:
The coupling mechanism uses hydraulic pressure to automatically control the lock-bolt and tenon engagement. Attaching the bucket simply requires positioning it near the arm, and hydraulic pressure automatically advances the lock-bolt into the lock-slot and the tenon into the mortise. Detaching is equally simple - hydraulic pressure retracts the lock-bolt, allowing the bucket to be removed without manual manipulation of complex locking mechanisms
Solution Approach 2:
The hydraulic system performs the complex work of engaging and disengaging the lock-bolt and tenon-mortise mechanism automatically. Once the bucket is positioned, the hydraulic system self-services the attachment process by advancing the locking components without operator intervention, and similarly self-services detachment by retracting the lock-bolt
3Stability of the object's composition
If hydraulic pressure is continuously maintained to keep the tenon engaged in the mortise, then the stability and tightness of the connection are improved, but the loss of energy increases due to continuous hydraulic system operation
Solution Approach 1:
The lock-bolt and tenon-mortise engagement creates a mechanically locked state that maintains connection stability without requiring continuous hydraulic pressure. The mechanical interlocking provides a cushion of security that preserves connection tightness even if hydraulic pressure is lost, reducing the need for continuous energy input to maintain stability
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 coupler-assembly provides a secure and reliable attachment of buckets to the front-end loader, ensuring they remain tightly integrated during operation and preventing accidental detachment, even under abusive conditions or hydraulic pressure loss, thus enhancing safety and operational efficiency.
Implementation Method 1
Hydraulic pressure is maintained, in the coupler-assembly, at all times while the bucket is in operation. The coupler-assembly includes a lock-bolt 40, which enters a lock-slot 41 in the side-plate of the frame 27.
Implementation Method 2
The wedge-surface 70 on the tenon 36 engages the mortise 38, and drives the mortise in the upwards direction (in FIG. 3), i.e the counter-clockwise sense, whereby the bucket-lug 30 is driven more deeply into the space between the cheek 32 and the pivot-pin 29.
Data Source
AI summary
For use with a front-end loader etc, the coupler-assembly provides a rigid connection between the pivoting arm-end and the bucket. Included is a slider-block, guided in slide-guides and slider-slots in side-plates of the frame of the arm-end. Sliding the block using a hydraulic slider ram, wedges the bucket lugs tightly into the frame. The slider-ram is integrated into and moves with the block. A lock-spring urges a lock-bolt into position to lock the bucket-lug to the arm-end frame. A lock-ram releases the lock-bolt, to permit disengagement.