Parking Lock Actuation Linkage With Movable Pivot to Cut Internal Forces
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Solution Overview
Problem
Existing parking lock actuating arrangements for motor vehicles face high internal forces, particularly torsional forces, which require strong component designs, often using sheet metal, limiting the use of lighter and cost-effective plastic materials.
Innovation Solution
The actuating arrangement features a basic slide with a preloaded spring and an electromagnetic locking mechanism, allowing the first additional articulation point to be on the basic slide, which can be moved relative to the housing plate, reducing internal forces by varying the lever coupling between the adjusting and parking lock slides, and incorporating a self-locking spindle drive for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-lever shifting mechanism with a pivoting lever articulated at three points is used, then the parking lock slide can be displaced between engaged and disengaged positions, but high internal forces particularly torsional forces occur requiring strong sheet metal component design
Solution Approach 1:
The basic lever is transformed into a basic slide that can be displaced linearly between a basic position and a preloaded position. This dynamic repositioning of the first further articulation point allows the lever coupling between the adjusting slide and parking lock slide to be varied, optimizing force distribution and reducing internal forces in the mechanism.
Solution Approach 2:
A preloaded spring is introduced as an intermediary energy store between the basic slide and the housing plate. The spring provides preloading force that optimizes the lever coupling during operation, enabling the mechanism to achieve reliable parking lock engagement with reduced internal forces and allowing plastic components to be used.
2Strength
If strong sheet metal components are used to withstand high internal forces, then the parking lock actuating mechanism can reliably operate, but the cost and weight increase compared to plastic parts
Solution Approach 1:
The invention changes the operational parameters of the actuating mechanism by introducing a displaceable basic slide with preloaded spring. This allows the lever coupling to be optimized during operation, reducing the peak internal forces to a level where lighter plastic components can be used instead of strong sheet metal parts, thereby reducing weight and cost.
3Stability of the object's composition
If the first further articulation point is fixed on the housing plate, then the pivoting lever provides stable leverage, but the lever coupling cannot be optimized and high internal forces occur
Solution Approach 1:
The first further articulation point is moved from a fixed position on the housing plate to a displaceable position on the basic slide. This allows the articulation point to dynamically adjust its position between basic and preloaded positions, maintaining lever stability while optimizing the lever coupling to reduce internal forces during operation.
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 design reduces internal forces, enabling a higher proportion of plastic components, improves structural efficiency, and ensures reliable engagement and disengagement of the parking lock, even in system failures, with manual emergency release options for towing.
Implementation Method 1
which is subjected to spring force in the direction of its basic position by means of a preloaded spring
Implementation Method 2
can be held in its prestressed position, which is shifted counter to the prestressing spring force, by means of an electromagnetic locking mechanism that counteracts the prestressing spring force
Data Source
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AI summary
The invention relates to an actuation arrangement for a parking lock for a motor vehicle, comprising an actuating drive having an actuating slide (24) that is linearly displaceable relative to a base (12) between a central position and a first deflected sliding position; a parking lock slide (31) that is linearly displaceable relative to the base (12) between an engagement position and a disengagement position, which can be coupled with a parking lock via a parking lock control path (33) such that in the engagement position of the parking lock slide, which is defined by a base-fixed stop (34), the parking lock slide allows the parking lock to be engaged and is suppressed in the disengagement position of the parking lock slide; and a pivoting lever (50), which is pivotably mounted, both on the actuating slide (24) at an actuating slide bearing point and on the parking lock slide (31) at a parking lock slide bearing point, and furthermore, is pivotably mounted at a first additional articulation point such that, by means of displacing the actuating slide (24), a corresponding lever-translated displacement of the parking lock slide (31) can be brought about. The invention is characterized in that the first additional articulation point is located on a basic slide (42) that is linearly displaceable relative to the base (12), said basic slide being displaceable between a basic position and a pre-tensioning position, which can be held by spring force in the direction of the basic position of the basic slide by means of a pre-tensioning spring (43), and in the pre-tensioning position of the basic slide displaced against the pre-tensioning spring force, can be held by means of an electromagnetic locking mechanism (46, 47) counteracting the pre-tensioning spring force.