Swivelling Unit Toggle Lever Asymmetry Heavy Component Torque
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Solution Overview
Problem
Existing swivel units in the automotive industry face challenges with unfavorable force introduction and high torque requirements, particularly when the lever pivots back, leading to inefficient movement and potential issues with heavy components.
Innovation Solution
The design shifts the pivoting center of the actuator coupling axis relative to the housing head, allowing for a constant or nearly constant torque over a large swivel angle range by tilting the lever arm, and incorporates a stroke adjustment piston with radial play and a locking element for precise adjustment, enabling a larger pivoting range and favorable leverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lever is pivotally movable around the housing-head fixed pivot axis with the toggle joint arrangement, then the arm can be swiveled through a certain angular range, but unfavorable force transmission occurs through the pivot points leading to high torque requirements and problems when swiveling the arm back
Solution Approach 1:
The patent applies asymmetry by positioning the pivot axis of the lever offset from the longitudinal axis of the actuator, creating an asymmetric geometric relationship. This asymmetric configuration ensures that the lever arm distance remains favorable throughout the swiveling range, avoiding dead center positions and maintaining efficient force transmission in both forward and reverse directions.
Solution Approach 2:
The patent implements dynamics by making the lever pivotally movable around a fixed pivot axis while maintaining a constant favorable lever arm distance through the offset configuration. This dynamic arrangement allows the lever to swivel through a large angular range (up to 180°) while continuously maintaining optimal mechanical advantage, adapting to different positions without losing force efficiency.
2Adaptability or versatility
If the actuator is designed as a piston rod driven by compressed air, then the device can be actuated pneumatically, but the force transmission becomes unfavorable in the open position requiring unacceptably high forces
Solution Approach 1:
The patent introduces an intermediary geometric configuration - the offset pivot axis arrangement - that mediates between the pneumatic actuator and the lever. This intermediary configuration transforms the pneumatic force into efficient mechanical motion by maintaining a constant favorable lever arm, acting as a force-optimizing intermediary that eliminates the need for excessively high pneumatic pressures.
3Strength
If the lever arm distance is optimized for the working position, then favorable leverage is achieved in clamping, but the lever cannot pivot back smoothly due to unfavorable force introduction
Solution Approach 1:
The asymmetric offset of the pivot axis from the actuator's longitudinal axis creates a geometric configuration that is not optimized for a single position but maintains favorable leverage throughout the entire range of motion. This asymmetry prevents symmetric dead center positions, enabling smooth operation in both clamping and return strokes.
Solution Approach 2:
The dynamic pivotal connection allows the lever to adapt its position continuously while the offset configuration ensures that the lever arm distance remains favorable at all positions. This dynamic capability enables the system to maintain strong clamping force while also allowing smooth return motion without mechanical locking or excessive force requirements.
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 configuration ensures smooth movement and favorable torque throughout the entire swivel angle, reducing the effort required to pivot heavy components and preventing issues during the return stroke, with a pivoting range of up to 180° and improved leverage for efficient operation.
Implementation Method 1
the actuator, designed as a piston rod, is driven by a piston that is alternately pressurized on both sides by compressed air
Implementation Method 2
A stroke-adjusting piston 10, which is acted upon by compressed air, is coupled to the stroke-adjusting element 11
Data Source
Figure 1~4
AI summary
The assembly to move masses up and down (T-V) has a drive (2) to operate a toggle lever structure (17,19) at a pivot axis (16). In the working position, the toggle lever swing axis (18) next to the fixed axis (20) at the housing head is swung at a maximum into the outer end zone of housing head (1) interior. The total swing movement range of the outer lever (21) around the fixed axis is at an acute angle (alpha ) against the center line (24) of the piston rod (5).