Parking Lock Gear Snap-Ring Assembly for Compact Axial Securing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor vehicle transmissions with starting components like hydrodynamic torque converters or hydraulically actuated shift elements cannot secure the vehicle from rolling away without a mechanical connection to the driven wheels once the prime mover is off, necessitating separate parking locks that are not easily compact or efficient.
Innovation Solution
A parking lock arrangement that uses a parking lock gear secured axially via a slotted, radially elastic snap ring, allowing for easy installation and compact design by overlapping recesses on the gear and component, with driving tooth systems for conjoint rotation and radial preloading for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a securing ring is used to axially secure the parking lock gear on the transmission shaft, then the axial securing reliability is improved, but the radial space requirement increases
Solution Approach 1:
The securing ring is nested within the overlapping recesses of the parking lock gear and transmission shaft, allowing the ring to be positioned radially between the two components without requiring additional radial space. The recesses are formed such that the securing ring fits into the interstitial space created by the overlapping geometry, effectively nesting the securing mechanism within the existing component structure.
Solution Approach 2:
The solution transitions from a conventional radial securing approach to an axial overlapping recess configuration. By forming recesses that extend peripherally around the guide regions and overlapping in the axial direction, the securing mechanism utilizes the axial dimension to create engagement space, thereby avoiding additional radial space requirements while maintaining reliable axial securing.
2Reliability
If a securing ring positioned radially between the parking lock gear and component is used, then the parking lock gear is reliably secured against axial migration, but the device complexity increases
Solution Approach 1:
The securing ring integrates multiple functions into a single component: it provides axial securing by engaging the overlapping recesses, maintains radial positioning between the parking lock gear and transmission shaft, and enables easy installation through its elastic deformation capability. This merging of functions reduces the need for separate securing mechanisms and simplifies the overall device structure.
Solution Approach 2:
The securing ring is designed with radially elastic properties, allowing its cross-sectional dimensions to change under radial preloading. This parameter change enables the ring to deform radially inward during installation to pass through the overlapping recesses, then return to its original shape to provide secure engagement, simplifying the installation process without requiring complex tooling or multiple components.
3Ease of manufacture
If the parking lock gear is slid onto the transmission shaft via guide regions, then the assembly ease is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The guide regions are designed with tolerance-compensating features that accommodate variations in manufacturing precision. The overlapping recesses and elastic securing ring create a cushioning effect that absorbs misalignment between the guide regions during assembly, allowing the parking lock gear to be slid onto the transmission shaft without requiring extremely tight tolerances while still achieving proper final positioning.
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 provides reliable axial securing of the parking lock gear with reduced radial space requirements, enhancing load capacity and ease of assembly while maintaining the mechanical connection, thus preventing the vehicle from rolling away.
Implementation Method 1
a securing ring (12) which, for this purpose, is positioned radially between the parking lock gear (4) and the component (3) in a securing position in which the securing ring (12) engages partially radially into the recess (14) in the guide region (6) on the parking lock gear (4) and partially radially into the recess (13) in the guide region (7) on the component (3)
Data Source
AI summary
A parking lock arrangement for a motor vehicle transmission includes a parking lock gear arranged on a transmission shaft by sliding onto a guide region (7) defined on the radially outward side of the component (2) via a guide region (6) formed on the radially inward side of the parking lock gear (4). In the final position, a recess (14) extending peripherally around the guide region (6) of the parking lock gear (4) has been axially brought into overlap with a recess (13) extending peripherally around the guide region (7) of the component. The parking lock gear (4) and the component are securable against each other via a securing ring. The securing ring engages partially radially into the recess (14) in the guide region (6) on the parking lock gear (4) and partially radially into the recess (13) in the guide region (7) on the component.