Utility Vehicle Jacking System Lever Mechanism
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Solution Overview
Problem
Existing jacking systems for utility vehicles, particularly those with aerial lifting apparatuses, face issues with load transmission and cross forces when operating on sloped ground, leading to poor stability and increased wear due to shear and bending forces on the telescopic drive element and pivot support.
Innovation Solution
The introduction of a lever arrangement between the support drive and telescopic beam to redirect and absorb horizontal shear forces, converting them into compressive forces that can be transmitted directly into the vehicle body, thereby reducing the load on the telescopic drive element and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the telescopic drive element is attached at a relatively high position on the vehicle body, then the tilting mechanism can effectively lower the telescopic beam end to the ground, but cross forces acting perpendicular to the beam extension direction introduce shear and bending forces on the drive element leading to poor stability and increased wear
Solution Approach 1:
A lever arrangement with first and second levers is introduced as an intermediary mechanism between the telescopic drive element and the telescopic beam. The first lever connects the drive element to the vehicle body at a lower hinge point, while the second lever connects the first lever to the telescopic beam. This intermediary lever system redirects the forces, allowing the drive element to operate with reduced cross forces and shear forces while maintaining the ability to effectively lower the beam end to the ground.
2Force
If the telescopic drive element has a relatively strong inclination with respect to the horizontal plane, then it can provide sufficient lifting force, but it cannot fully absorb horizontal cross forces acting along the telescopic beam, which are introduced mainly at the pivot support
Solution Approach 1:
The lever arrangement acts as a force redistributing intermediary. The first lever, connected to the vehicle body at a lower hinge point, and the second lever, connected to the telescopic beam, work together to redirect horizontal cross forces. This allows the inclined drive element to maintain its lifting force capability while the lever system absorbs and redistributes the horizontal cross forces that would otherwise be introduced mainly at the pivot support.
3Reliability
If the attachment point of the drive element is lowered on the vehicle body, then cross forces are reduced, but the ability to effectively lower the beam end to the ground and jack the vehicle is compromised
Solution Approach 1:
The lever arrangement introduces an additional dimensional aspect to the force transmission system. By using the mechanical advantage and geometric configuration of the first and second levers, the system transforms the force vectors in multiple directions. This allows the drive element to be positioned at an optimized height that reduces cross forces, while the lever system compensates to maintain the effective ability to lower the beam end and jack the vehicle.
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 enhances the stability and reduces wear on the moving parts of the jacking system by effectively managing cross forces and linear forces acting on the telescopic beam, ensuring better load transmission and reduced mechanical stress on the vehicle body.
Implementation Method 1
This lever arrangement comprises a first lever (36) and a second lever (38). The first end (40) of the first lever (36) is pivotably attached to the vehicle body (12) at a first hinge point (42) that is disposed below the attachment point (32) of the first end (30) of the drive element at the vehicle body (12).
Implementation Method 2
a support drive (26) with a telescopic drive element, which is a hydraulic cylinder (28) in the present embodiment
Implementation Method 3
The first end (40) of the first lever (36) is pivotably attached to the vehicle body (12) at a first hinge point (42)
Data Source
Figure 1
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Figure 3
AI summary
A jacking system (10) for a utility vehicle comprises a telescopic beam (14) suspended under the vehicle body (12) which is extractable in a generally horizontal direction and tiltable by a tilting mechanism to lower the extracted outer support end (20) to the ground, said tilting mechanism comprising a pivot support (24) supporting the telescopic beam (14) at the vehicle body (12) pivotable around a horizontal axis and a support drive (26) comprising a telescopic drive element (28) of variable length, with a first end (30) of the drive element (28) being pivotably attached to the vehicle body (12) and its opposite second end (34) being supported at the telescopic beam (14) at a position between the pivot support (24) and the support end (20) of the telescopic beam (14). The tilting mechanism further comprises a lever arrangement for load transmission between the support drive (26) and the telescopic beam (14), said lever arrangement comprising a first lever (36) with a first end (40) pivotably attached to the vehicle body (12) at a first hinge point (42) below the attachment point (32) of the first end (30) of the drive element (28) at the vehicle body (12), and a second lever (38) with a first end (48) pivotably attached to a second end (44) of the first lever (36) at a second hinge point (46) and a second end (50) pivotably attached to the telescopic beam (14).