Pivotable Boom With Single Internal Lifting Cylinder
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Solution Overview
Problem
Mobile work machines, such as wheel loaders and excavators, face issues with large installation space, increased costs, and reduced visibility due to the double design of lifting cylinders mounted laterally below the swing arms, along with a higher risk of failure and limited space for internal lifting cylinders.
Innovation Solution
A mobile work machine design featuring a pivotable boom with a single lifting cylinder positioned between two rockers, allowing for flexible placement of a tilting cylinder off-center, optimizing installation space and improving visibility while reducing costs and operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two lifting cylinders are mounted laterally below the swing arms, then the boom can be raised and lowered, but the installation space increases and the field of vision of the attachment is restricted
Solution Approach 1:
The patent combines the functions of two separate lifting cylinders into a single lifting cylinder mounted internally within the boom. This internal mounting position merges the space previously occupied by two lateral cylinders and their associated mounting structures into one compact arrangement, reducing the overall installation space while maintaining the boom lifting function.
Solution Approach 2:
The lifting cylinder is repositioned from a lateral external mounting (horizontal dimension) to an internal mounting within the boom structure (vertical/longitudinal dimension). This dimensional change allows the cylinder to be integrated into the boom's internal volume, freeing up external space and improving the field of vision.
2Ease of operation
If two lifting cylinders are mounted laterally below the swing arms, then the boom can be raised and lowered, but the costs increase and the risk of failure increases
Solution Approach 1:
The patent merges the lifting function into a single cylinder system, eliminating the redundancy of two separate cylinders. This reduces the number of potential failure points from two cylinders and their associated hoses and mounting points to just one system, thereby improving reliability while maintaining the same lifting capability.
Solution Approach 2:
The patent extracts the unnecessary redundancy of the second lifting cylinder and its associated components (hoses, mounting structures). By removing this redundant system while retaining the essential lifting function through a single optimized cylinder, the overall system reliability improves due to fewer potential failure points.
3Ease of operation
If two lifting cylinders are mounted laterally below the swing arms, then the boom can be raised and lowered, but the maintenance requirements increase
Solution Approach 1:
The patent consolidates the maintenance requirements by merging two separate lifting cylinder systems into one. This reduces the number of seals, hoses, mounting points, and potential leak sources that require maintenance, thereby simplifying the maintenance schedule and reducing the time and resources needed for servicing.
4Ease of operation
If a tilt cylinder is mounted centrally below the boom, then the implement can be tilted, but no space is available for an internal lifting cylinder
Solution Approach 1:
The lifting cylinder is positioned in a different spatial dimension (internal to the boom structure along the longitudinal axis) rather than externally below the boom. This allows the tilt cylinder to remain in its optimal central position for implement tilting while the lifting cylinder utilizes the internal volume of the boom, eliminating the space conflict between the two cylinders.
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 enables a more space-efficient and cost-effective design with improved visibility and reduced maintenance needs, enhancing operational reliability and flexibility in tool positioning.
Implementation Method 1
at least one lifting cylinder (23) having a first piston (232) and a first piston rod (231) is provided for pivoting the boom (5) relative to the vehicle frame (10)
Implementation Method 2
a tilting unit (27) for pivoting/tilting the tool holding device (9) relative to the boom (5) comprises at least one rocker arm (29) and a tilting cylinder (24) having a second piston rod (241) and a second piston (242)
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A mobile work machine (1) with a vehicle frame and with a boom (5) pivotable about a pivot axis with respect to the vehicle frame is proposed, wherein the boom (5) comprises a vertical boom longitudinal center plane (25) oriented perpendicular to the pivot axis and a tool holding device (9) for holding a work tool, wherein at least one lifting cylinder (23) having a first piston and a first piston rod is provided for pivoting the boom (5) relative to the vehicle frame, wherein a tilting unit for pivoting/tilting the tool holding device (9) relative to the boom (5) comprises at least one tilting lever (29) and a tilting cylinder (24) having a second piston rod and a second piston, wherein the tilting cylinder (24) is rotatably arranged/mounted at a first end (31) of the tilting lever (29), wherein a tilting rod (26) is rotatably arranged/mounted at a second end (32) of the tilting lever (29).wherein the disadvantages of the prior art are at least partially improved or avoided, in particular the installation space is optimized, with only one lifting cylinder (23) being present within the boom (5) or the rocker contour, if possible. This is achieved, among other things, by the tilting rod (26) being movable on the vertical boom longitudinal center plane (25), wherein the first end (31) of the tilting lever (29) is arranged offset next to the vertical boom longitudinal center plane (25) when viewed in the horizontal direction.