Parking Lock Actuation via Shifting Drum Guide Track
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing parking locks for motor vehicle transmissions are complex and require significant mechanical forces, making assembly and overall structure cumbersome.
Innovation Solution
A parking lock system featuring a rotatable park gear with an actuation device that includes a shifting drum and guide unit, allowing for radial and parallel adjustment between locking and unlocking positions, reducing mechanical forces and friction, and eliminating the need for a conventional locking pawl by using a guide unit or locking lever to engage with the park gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional locking pawl and park gear system is used, then the transmission can be reliably locked, but the mechanical forces and friction increase and the structure becomes complex
Solution Approach 1:
The invention extracts and eliminates the locking pawl from the conventional parking lock system. Instead of using a separate locking pawl that engages with the park gear, the patent uses a guide unit with a guide track that directly guides the actuation device radially, achieving the locking function without the intermediate locking pawl component.
Solution Approach 2:
The invention merges the guiding function and locking function into a single integrated system. The guide unit with its guide track combines the radial guidance of the actuation device with the locking mechanism, eliminating the need for separate locking components and reducing overall structural complexity.
2Ease of manufacture
If a conventional locking pawl system is used, then the parking lock can be assembled, but the assembly process becomes cumbersome and the overall structure is complex
Solution Approach 1:
The locking pawl is extracted from the system and replaced by the guide unit mechanism. This simplifies the assembly process as fewer discrete components need to be assembled, and the guide track provides inherent guidance that reduces alignment complexity during assembly.
Solution Approach 2:
Instead of using a locking pawl that actively engages with the park gear teeth, the invention inverts the approach by using a guide track that passively guides the actuation device through radial movement. The locking action emerges from the guidance mechanism itself rather than from a separate engaging component.
3Force
If radial adjustment of the actuation device is implemented, then mechanical forces are reduced, but a guide mechanism is required
Solution Approach 1:
The guide track serves as an intermediary element between the actuation device and the park gear. It mediates the radial movement of the actuation device, providing smooth guidance that reduces mechanical forces and friction while eliminating the need for a locking pawl.
Solution Approach 2:
The invention replaces the mechanical locking pawl engagement system with a radial guidance system based on the guide track. This substitution reduces mechanical forces and friction by eliminating the sliding and impacting forces associated with pawl engagement, replacing them with smoother radial guidance forces.
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 system simplifies assembly and construction, reduces mechanical forces and friction, and effectively locks and unlocks the transmission by converting rotary movement into linear or pivot movements, enhancing ease of use and reducing component count.
Implementation Method 1
a rotary movement of the shifting drum is converted into a linear movement of the guide unit
Implementation Method 2
the guide unit is guidable by the guide track radially to the axis of rotation of the park gear and parallel to the guiding axis
Data Source
AI summary
A parking lock for a transmission of a motor vehicle may include a park gear rotatable about an axis of rotation, and an actuation device adjustable into a locking position and an unlocking position radially relative to the axis of rotation. In the unlocking position, rotating of the park gear may be possible, and in the locking position, rotating of the park gear may be prevented by way of positive locking. The actuation device may include a shifting drum and a locking lever, wherein the shifting drum may be rotatable about a guiding axis that is radial relative to the axis of rotation. The locking lever, by way of a guide track formed in the shifting drum, may interact with the guide track so that when the shifting drum is rotated, the locking lever may be guidable by the guide track radially relative to the axis of rotation and parallel to the guiding axis, and thereby the actuation device may be adjustable into the locking position and into the unlocking position.