Automatic Manual Transmission Parking Lock Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing double-clutch gearboxes with parking lock devices require dedicated actuators that are costly, large, and unreliable, which can lead to uncontrolled vehicle movement or starting issues due to actuator malfunctions.
Innovation Solution
An automatic manual transmission with a servo-assisted double-clutch gearbox that integrates a parking lock device, where the activation and deactivation of the parking lock are controlled using a common gear actuator, eliminating the need for a dedicated actuator and incorporating a connecting device with a coupling member and electromagnetic actuator for efficient and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated actuator is used to control the parking lock device, then the parking lock device can be reliably controlled, but the cost and dimensions of the parking lock device greatly increase
Solution Approach 1:
The patent merges the parking lock control function with the existing gear actuator system. The gear actuator, which already exists for gear selection, is enhanced with an electromagnetic component to also control the parking lock mechanism. This eliminates the need for a separate dedicated actuator, reducing system complexity and cost while maintaining reliability through the integrated control architecture.
Solution Approach 2:
The gear actuator is designed with multi-functionality, serving both gear selection and parking lock control purposes. By adding an electromagnetic component to the existing gear actuator, the system achieves universal control capability for multiple functions using a single actuator unit, thereby reducing overall system complexity and component count.
2Reliability
If a dedicated actuator with high force capability is used to overcome jamming, then the parking lock device can be reliably activated, but the actuator dimensions and cost increase
Solution Approach 1:
The patent combines the parking lock actuation function with the existing gear actuator mechanism. The electromagnetic component integrated into the gear actuator provides sufficient force for parking lock activation without requiring a separate heavy-duty actuator. This sharing of mechanical resources reduces overall actuator weight while maintaining the capability to overcome potential jamming forces.
3Ease of operation
If a dedicated actuator is used for parking lock control, then precise control is achieved, but the device becomes less cost-effective
Solution Approach 1:
The patent integrates parking lock control into the existing gear actuator system, sharing control electronics and mechanical components. This merging approach maintains precise control capability through the existing control architecture while significantly reducing manufacturing costs by eliminating the need for a separate dedicated actuator and its associated control systems.
Solution Approach 2:
The gear actuator is designed with universal control capability to handle both gear selection and parking lock functions. This multi-functionality reduces the overall system cost by using a single actuator platform for multiple purposes, while maintaining the precision required for reliable parking lock operation through integrated control logic.
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 a cost-effective, compact, and reliable method to control the parking lock device, ensuring the vehicle remains secure when parked and simplifies the actuation process, reducing the risk of malfunctions and operational costs.
Implementation Method 1
incorporating a connecting device with a coupling member and electromagnetic actuator for efficient and reliable operation
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An automatic manual transmission (1) having: at least one primary shaft (5); at least one secondary shaft (7); a plurality of gear pairs (8, 9), each of which mechanically couples the primary shaft (5) to the secondary shaft (7); a plurality of synchronizers (10), each of which is mounted coaxial to a shaft (7), is coupled to a gear (9) of at least one gear pair, and is adapted to be actuated to engage the gear (9) to the shaft (7); a plurality of forks (11), which actuate the synchronizers (10) and are movable; a parking lock device (20) which may be actuated to prevent the rotation of the secondary shaft (7); and a connecting device (21), which is mechanically connected on one side to a first fork (11d) and on the other side to the parking lock device (20) to transmit the movement of the first fork (11d) to the parking lock device (20) so as to control the activation and deactivation of the parking lock device (20) itself by exploiting the movement of the first fork (11d).