Loader Work Device with Reverse-L Boom Support
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Solution Overview
Problem
Conventional loader work devices experience significant forward or rearward movement of the bucket during vertical lifting, resulting in work loss and increased manufacturing, maintenance, and repair costs due to complex structural components.
Innovation Solution
A loader work device with a simplified structure featuring a 'reverse-L' shaped boom support with multiple hinge parts positioned to minimize bucket movement, including a rear link connected to a first hinge part and a rotation link connected to a front hinge part, allowing for vertical lifting with reduced forward/rearward fluctuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional lifting arm structure with rotation hinges is used, then the bucket can be lifted, but the bucket moves forward or rearward during vertical lifting
Solution Approach 1:
The patent introduces a parallel mechanism with two lifting arms (first and second lifting arms) that move in parallel planes. This dimensional change from single-arm rotation to dual-arm parallel motion eliminates the forward/rearward bucket movement while maintaining vertical lifting capability, as both arms work together to constrain the bucket's motion path.
Solution Approach 2:
The lifting mechanism is segmented into multiple independent components: first lifting arm, second lifting arm, first lift link, second lift link, first boom cylinder, and second boom cylinder. This segmentation allows each component to be optimized independently and work together to achieve the desired motion control, preventing unwanted bucket displacement.
2Manufacturing precision
If a complex structural design with multiple components is used to reduce bucket movement, then position stability improves, but manufacturing and maintenance costs increase
Solution Approach 1:
The patent employs symmetric, interchangeable components where the first and second lifting arms, lift links, and boom cylinders are essentially duplicate units performing identical functions. This universality allows for standardized manufacturing and simplified maintenance, as any component can be replaced with an identical unit, reducing overall system complexity despite the parallel structure.
Solution Approach 2:
The patent combines the lifting functions of both left and right sides into a coordinated parallel mechanism. The first and second lifting arms work together as an integrated system, with their motion synchronized through the boom cylinders, achieving stable vertical bucket movement while maintaining structural efficiency.
3Ease of operation
If the lifting arm rotates about a hinge part, then the bucket can be lifted, but the vehicle must move forward or rearward to compensate
Solution Approach 1:
The patent transitions from single-arm rotation about a hinge to a parallel four-bar linkage mechanism where both lifting arms move in parallel. This dimensional change constrains the bucket to vertical motion only, eliminating the need for vehicle movement compensation and preventing work loss.
Solution Approach 2:
The lift links (first lift link and second lift link) act as intermediaries between the boom cylinders and the lifting arms. These intermediary components translate the cylindrical motion into coordinated parallel arm movement, ensuring the bucket moves vertically without requiring vehicle position changes.
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 solution effectively minimizes bucket movement in the forward/rearward direction during vertical lifting, enhancing operational accuracy and reducing manufacturing and maintenance costs by simplifying the component layout and sharing hinge parts.
Implementation Method 1
a boom cylinder having one end coupled to a second boom support hinge part formed in the boom support to rotate the boom support such that the lifting arm rotates or moves up and down
Implementation Method 2
a rear link having one end coupled to a first boom support hinge part formed in the boom support and an opposite end coupled to a rear hinge part formed in the main body rear; and a rotation link having one end coupled to a third boom support hinge part formed in the boom support and an opposite end coupled to a front hinge part formed at a front end of the vehicle main body
Data Source
AI summary
Provided is a work vehicle including a cabin and a loader work device. The work vehicle includes: a vehicle main body; a main body rear; front and rear wheels; a bucket; a lifting arm connected to the bucket to lift the bucket; a boom support connected to the lifting arm; a rear link having one end coupled to a first boom support hinge part of the boom support and an opposite end coupled to a rear hinge part of the main body rear; a boom cylinder having one end coupled to a second boom support hinge part of the boom support to rotate the boom support; and a rotation link having one end coupled to a third boom support hinge part of the boom support and an opposite end coupled to a front hinge part of the vehicle main body.