Excavator Lifting Arm Linkage for Compact High-Stability Lifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile working machines, such as mini-excavators and backhoes, face limitations in stability, compactness, and lifting capacity due to conventional lever mechanisms that require wide designs and one-sided support, limiting their performance and operational flexibility.
Innovation Solution
A novel lifting arm design featuring a double-curved or S-shaped second lever element supported on both sides of the arm cheek sections, combined with a four-point mechanism and a vertically oriented bearing shaft, allowing for a compact, stable, and flexible pivoting motion without widening the bearing width, and enabling a central arrangement that avoids protrusion beyond the undercarriage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lever mechanism with one-sided support is used, then the structure is simpler, but the stability and lifting capacity are reduced
Solution Approach 1:
The patent inverts the conventional one-sided support arrangement by implementing double-sided support for the second lever element. Instead of supporting the lever from one side only, the invention provides support from both sides through the arm cheek sections, thereby improving stability and lifting capacity while maintaining reasonable structural complexity
Solution Approach 2:
The patent transitions from a conventional single-plane lever mechanism to a three-dimensional arrangement with the second lever element having a double-curved or S-shape. This dimensional change allows the lever to be supported on both sides while accommodating the pivoting motion, resolving the contradiction between stability and structural complexity
2Reliability
If the bearing width is widened to accommodate the lever mechanism, then the stability improves, but the transport height increases
Solution Approach 1:
The patent nests the second lever element within the lifting arm structure by positioning it between the arm cheek sections. This nested arrangement allows the lever mechanism to be integrated into the existing arm geometry without requiring additional lateral space or increasing the overall transport dimensions
Solution Approach 2:
The invention utilizes the vertical dimension by arranging the receiving recess vertically between the arm cheek sections, allowing the second lever element to be supported on both sides without widening the bearing width horizontally, thus maintaining compact transport dimensions
3Length of stationary object
If a four-axis swivel mechanism is used, then the transport height is reduced, but the lifting force in the upper range decreases
Solution Approach 1:
The patent employs a double-curved or S-shaped second lever element that optimizes the mechanical advantage throughout the lifting range. The curved geometry allows for improved force transmission, particularly in the upper lifting range, compensating for the limitations of the four-axis swivel mechanism while maintaining reduced transport height
4Force
If the lifting arm is designed with wider bearing width, then the lifting capacity increases, but the operational flexibility through doorways and tunnels is reduced
Solution Approach 1:
The patent integrates the second lever element and its support structure within the existing lifting arm geometry, nesting the mechanism between the arm cheek sections. This allows the lifting arm to maintain its compact external dimensions for flexibility while providing internal structural reinforcement for increased lifting capacity
Solution Approach 2:
The invention segments the lifting arm structure into arm cheek sections that frame the second lever element, allowing the lever mechanism to be accommodated within the segmented structure without increasing the overall external dimensions, thus maintaining operational flexibility
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 new design enhances lifting force by 50-60% in the upper range, allowing for larger loads to be lifted efficiently with minimal structural reinforcement, improving operational capability and energy efficiency while maintaining comparable weight and reducing hydraulic pressure, thus enhancing the machine's performance and economy.
Implementation Method 1
the second lever element has a double curved shape and/or is S-shaped
Implementation Method 2
the hydraulic cylinder and the connecting lever, or rather their common axis of rotation, are pivotally mounted to the lifting arm via a second connecting lever
Data Source
Figure 1~2
Figure 3~4
AI summary
A mobile working machine (1) is provided with a vehicle frame and with at least one lifting arm (2) for raising and/or lowering a tool holding device, wherein a drive unit is provided for driving at least one drive element (5) such as a drive wheel or a drive chain (5), wherein at least the tool holding device is designed to hold a detachably connectable working tool, wherein at least one lifting cylinder (3) is arranged on the lifting arm (2), wherein a first retaining shaft (16) for pivoting the lifting arm (2) is arranged between a lifting arm holding unit (7) and a first lifting arm end section (9) of the lifting arm (2), and at least one first lever element (12) is arranged between the lifting arm holding unit (7) and the lifting cylinder (3).wherein at least one second retaining shaft (13) is provided between the lifting arm holding unit (7) and the first lever element (12), and at least one first lever shaft (14) is provided between the first lever element (12) and the lifting cylinder (3), wherein at least one second lever element (11) is arranged between the lifting arm (2) and the first lever shaft (12) or the lifting cylinder (3), which at least partially improves the performance and/or stability of the working machine (1) or the lifting arm (2). This is achieved by the fact that the first lifting arm end section (9) of the lifting arm (2) has at least one receiving recess arranged between two arm cheek sections (10) for receiving at least one end of the second lever element (11), wherein the two arm cheek sections (10) are designed to receive at least the second lever shaft (11).