Park-Lock Device Spring and Solenoid Integration
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Solution Overview
Problem
Existing park-lock devices for transmissions lack modularity and are prone to breakage or malfunction, leading to increased manufacturing costs and reduced reliability.
Innovation Solution
A park-lock device with a mechanically interconnected system using a spring member and an electrically actuated locking device, allowing the same shift fork position to be used for both park-lock and reverse gear, incorporating a solenoid locking pin and a rotatably arranged locking arm to prevent transmission output shaft rotation, enhancing modularity and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate actuating device is used for park-lock, then the park-lock can be reliably actuated, but the device complexity increases and manufacturing cost rises
Solution Approach 1:
The patent combines the park-lock actuation function with the existing shift rod mechanism. The shift rod is extended to engage a cam member that actuates the parking pawl, eliminating the need for a separate actuating device. This integration reduces device complexity while maintaining reliable park-lock actuation through the existing shifting mechanism.
Solution Approach 2:
The shift rod is given dual functionality: it performs both gear shifting and park-lock actuation. By extending the shift rod to include a cam member engagement feature, the same component serves multiple purposes, reducing overall device complexity while ensuring reliable actuation of the park-lock function.
2Ease of manufacture
If the shift rod is extended to include park-lock engagement, then manufacturing cost is reduced, but the risk of breakage or malfunction increases
Solution Approach 1:
The extended shift rod is divided into functional segments: the main shift rod portion for gear shifting and an extended portion with a cam member for park-lock actuation. This segmentation allows each part to be optimized for its specific function, reducing stress concentrations and potential failure points while maintaining manufacturing efficiency.
Solution Approach 2:
The design incorporates a cam member that engages with the parking pawl through a controlled mechanical interaction. The cam geometry is designed to distribute forces evenly during engagement, preventing sudden shock loads that could cause breakage. The spring-loaded mechanism provides cushioning during engagement, reducing stress on the extended shift rod components.
3Ease of manufacture
If fewer shift fork positions are used, then modularity increases and manufacturing cost is reduced, but the ability to accommodate different gear configurations decreases
Solution Approach 1:
The shift fork is designed with universal engagement features that can accommodate multiple gear positions and configurations. The cam member on the extended shift rod can engage with parking gears in different positions, allowing the same basic mechanism to work with various gear arrangements (4-speed, 5-speed, 6-speed, etc.), thereby increasing adaptability without requiring additional components.
Solution Approach 2:
The park-lock mechanism incorporates a spring-loaded cam member that can dynamically adjust its engagement position. This dynamic design allows the same mechanical structure to accommodate different gear configurations by adapting to the specific position of the parking gear, enhancing versatility while maintaining a compact, cost-effective design.
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 increases modularity, reduces manufacturing costs, and enhances the robustness and reliability of the park-lock device by allowing the use of additional gears and providing a robust design less susceptible to breakage or malfunction.
Implementation Method 1
a spring member, wherein when the first arm is in the first position the spring member is in a first position wherein the bracket member remains in the first position, wherein when the first arm is in the second position, the spring member is in a second position of higher potential spring energy than in the first position
Implementation Method 2
the electrically actuated locking device comprises a solenoid and the movable locking member comprises a solenoid locking pin
Data Source
Figure 1
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AI summary
A park-lock device (1) comprising a first arm (3) arranged on a shift actuating device (22) to move with at least a portion of the shift actuating device (22) between at least a first position and a second position, a bracket member (9) movable between at least a first position and a second position wherein the bracket member (9) is adapted to actuate an engagement device (17) to prevent rotation of a transmission output shaft (21) in the second position, wherein the first arm (3) and the bracket member (9) is mechanically interconnected via a spring member (8), wherein when the first arm (3) is in the first position the spring member (8) is in a first position wherein the bracket member (9) remains in a first position, wherein when the first arm (3) is in a second position, the spring member (8) is in a second position of higher potential spring energy than in the first position, wherein the spring member is biased to move the bracket member (9) towards the second position, wherein the park-lock device(1) further comprises an electrically actuated locking device (13) comprising a movable locking member (13a) adapted to be releasably engaged with the bracket member (9), wherein when the movable locking member (13a) is in a first position, it prevents movement of the bracket member (9) from a first position to a second position, wherein when the movable locking member (13a) is in a second position upon actuation of the park-lock device 1, the bracket member (9) is allowed to move from the first position to the second position, whereby the engagement device (17) is actuated to prevent rotation of the transmission output shaft (21).