Telehandler Telescopic Arm Roller Trains for Low-Friction Extension
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Solution Overview
Problem
Telescopic arm systems in work vehicles experience increased hydraulic effort and pollution due to pad abrasion, leading to machine downtime and costs as pads wear out and fall to the ground, causing friction and requiring frequent replacement.
Innovation Solution
The implementation of a roller-based system with a frame fixed to a segment via a clearance adjustment system, where rollers are internally associated within a segment's cavity, reducing friction and wear by using roller trains on horizontal walls and biocompatible pads on vertical walls, eliminating pollution and extending the machine's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pads made of resistant material are used to facilitate sliding between segments, then sliding performance is improved, but pad abrasion occurs causing pollution, increased friction, and frequent replacement
Solution Approach 1:
The patent replaces the traditional sliding contact system with a rolling contact system. Rollers are introduced between the inner and outer segments, transforming the sliding friction mechanism into a rolling friction mechanism. This substitution eliminates pad abrasion and pollution while maintaining smooth movement between segments during telescopic extension and retraction.
Solution Approach 2:
The patent changes the fundamental contact parameter from sliding friction to rolling friction. By introducing rollers that rotate during segment movement, the friction type changes from high-friction sliding to low-friction rolling, thereby eliminating wear and pollution while improving overall system efficiency.
2Stability of the object's composition
If pads are used to support lateral swinging and horizontal movement, then structural stability is improved, but friction increases the effort required to extend and retract segments
Solution Approach 1:
The patent replaces the pad-based friction contact system with a roller-based rolling contact system. The rollers reduce the coefficient of friction significantly, allowing segments to extend and retract with minimal hydraulic effort while maintaining structural stability through the roller support mechanism.
3Ease of manufacture
If traditional sliding pads are used, then initial setup is simple, but machine downtime increases due to frequent pad replacement
Solution Approach 1:
The patent replaces consumable sliding pads with durable rollers that do not wear down. This eliminates the need for frequent replacement operations, reducing machine downtime significantly. The rollers are designed to be long-lasting components that maintain their rolling function throughout the service life of the telescopic arm.
4Length of moving object
If four or more segments with hydraulic actuators are used to achieve extension, then reach capability is improved, but complexity of the system increases
Solution Approach 1:
The patent employs a nested telescopic structure where multiple segments are arranged concentrically, with each segment containing the next smaller segment. This nesting arrangement allows the arm to achieve extended reach capabilities while maintaining a compact retracted configuration, optimizing space utilization and structural efficiency.
Solution Approach 2:
The telescopic arm is divided into multiple separable segments that can extend and retract independently. Each segment is equipped with its own hydraulic actuator and roller system, allowing modular operation and maintenance. This segmentation enables the arm to achieve long reach while keeping each individual component manageable in size and weight.
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 solution decreases the effort required to extend and retract the arm, reduces machine downtime, and minimizes maintenance costs by extending the lifespan of components and preventing pollution from worn materials.
Implementation Method 1
the friction between the pads and the segment increases the effort required to extend and retract the segment... the rollers project externally from the wall of the relative segment... reducing friction and wear
Data Source
Figure 1
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AI summary
Work vehicle (VEH) comprising a telescopic arm (A) equipped with at least one external segment (ES) and an internal segment (IS) suitable for inserting axially in the external segment, wherein both segments have a tubular shape with a rectangular cross-section, and wherein the external segment has a first end (ES2) hinged to the vehicle to raise and lower according to a hinge axis (X) and wherein said rectangular cross-section defines horizontal walls, parallel to said hinge axis, and wherein to said horizontal walls roller trains are associated to reduce frictions during a procedure of extension or retraction of the telescopic arm.