Parking Lock Damping Mechanism for Structure-Borne Sound Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing parking locks require high forces to unlock on inclines, generating structure-borne sound and vibrations due to mechanical transmission and friction, and existing damping solutions either fail to prevent sound production or add unnecessary costs and complexity.
Innovation Solution
A spring assembly is integrated into the parking lock to delay the force impulse and provide damping through internal friction between deformable spring plates, which can be coated for increased friction, and a roller assembly with support rollers and elastomers to absorb and dissipate energy, decoupling structure-borne sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a mechanical transmission mechanism is used to transfer actuator movement to the locking pawl, then high transmission forces can be realized, but structure-borne sound and vibrations are generated due to impacts against the housing
Solution Approach 1:
A plastic element is introduced as an intermediary between the transmission mechanism and the housing. This plastic component absorbs impact energy through deformation and reduces the transmission of structure-borne sound to the housing, thereby eliminating the rattling sound while maintaining the mechanical force transmission capability.
Solution Approach 2:
The patent changes the material parameter of the transmission element from rigid metal to elastic plastic. This parameter change allows the element to deform under impact, absorbing energy and reducing the transmission of vibrations and sounds to the housing, while still enabling high force transmission during normal operation.
2Object-generated harmful factors
If a plastic bushing or plastic layer is added as a damping mechanism, then structure-borne sound propagation is reduced, but heat and oil resistance requirements and assembly complexity increase
Solution Approach 1:
The plastic damping element is merged with the existing transmission mechanism components. Instead of being a separate bushing or layer requiring additional assembly steps, the plastic element is integrated directly into the transmission element or housing structure, eliminating the need for separate damping components and simplifying assembly.
Solution Approach 2:
The plastic element serves multiple functions simultaneously: it acts as a structural component of the transmission mechanism, provides damping to reduce structure-borne sound, and eliminates the need for separate heat and oil resistant components by inherently possessing these properties through its material characteristics.
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 reduces the need for high forces to unlock, minimizes structure-borne sound and vibrations, and achieves a compact, robust, and friction-optimized design by absorbing energy through deformation and friction, enhancing the overall performance and reducing noise.
Implementation Method 1
The spring assembly allows the springs to deform relative to each other
Implementation Method 2
the springs also perform a damping function due to this rubbing friction
Implementation Method 3
the moving parts are prevented from hitting the housing of the parking lock
Data Source
AI summary
A parking lock (1) for a motor vehicle, wherein the parking lock (1) has a housing (21), a locking pawl (4) which is arranged such that it can be pivoted about a rotational axis (a) and has a pawl tooth (5) which is configured for engaging in a positively locking manner into a parking lock gear, an actuator (6) for actuating the locking pawl (4), with the result that it can be brought reversibly into engagement with the parking lock gear by way of the pawl tooth (5) of the locking pawl (4), and a movable transmission element which transmits the movement of the actuator (6) to the locking pawl (4). The parking lock (1) has a damping mechanism for the locking pawl or for the movable transmission element.