Cabless Loader Lift Arm Force Distribution
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Solution Overview
Problem
Existing lift arm structures in power machines are limited by design, impacting lift capacity, manufacturability, maintenance, and cost, and do not effectively distribute forces to prevent lateral tilting and twisting.
Innovation Solution
A lift arm configuration with a longitudinal center line coincident with the power machine's center line, featuring a first and second cross member and elongated members that pivot about perpendicular joints, providing balanced support and distributing forces to the frame, while allowing for a wide radial arc of motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional lift arm structures are used, then the design is simpler, but lift capacity and force distribution are limited
Solution Approach 1:
The lift arm is divided into multiple segments including a first cross member, first elongated member, and second cross member, each performing specific structural functions. This segmentation allows optimized force distribution while maintaining manageable complexity through modular design
Solution Approach 2:
The lift arm structure transitions from a planar configuration to a three-dimensional spatial arrangement with members extending in multiple directions (cross members spanning width, elongated members connecting joints). This dimensional change enables superior force distribution and lift capacity
2Stability of the object's composition
If traditional lift arm configurations are used, then manufacturing is straightforward, but force distribution and stability are insufficient
Solution Approach 1:
Different portions of the lift arm structure have specialized configurations optimized for their specific functions: cross members for lateral stability, elongated members for force transmission, and specific joint arrangements for pivot motion. This local optimization achieves superior overall stability
Solution Approach 2:
The lift arm structure is pre-configured with its geometric relationships and attachment points designed to naturally distribute forces during operation. The longitudinal center line alignment and joint positioning are established in advance to prevent lateral tilting and twisting before they occur
3Reliability
If conventional lift arm designs are used, then maintenance is standard, but durability and operational reliability are compromised
Solution Approach 1:
The segmented modular structure allows individual components (cross members, elongated members, joints) to be independently inspected and replaced if needed, improving reliability through targeted maintenance while managing repair complexity through standardization
4Productivity
If traditional lift arm structures are used, then cost is lower, but lift capacity and operational efficiency are limited
Solution Approach 1:
The three-dimensional spatial configuration of the lift arm structure enables more efficient force vectors and lift capacity, improving operational productivity despite increased structural complexity compared to traditional planar designs
Data Source
AI summary
A lift arm has a longitudinal lift arm center line that is in a common plane with a longitudinal power machine center line. The lift arm is configured to rotate about a pivot axis that is perpendicular to the plane. The power machine includes a frame having an undercarriage and an upper portion, the undercarriage having opposed sides and the upper portion having a first width. The lift arm includes first and second cross members and a first elongated member. The first cross member spans the first width and is configured for attachment to the power machine at first and second joints. A first end of the first elongated member is attached to the first cross member inward of the opposed sides of the undercarriage. The second cross member is attached to the second end of the first elongated member and is configured for attachment to an implement.