Transmission Parking Lock Actuation Arrangement
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Solution Overview
Problem
Existing transmission parking lock actuation systems have complex designs with multiple components, leading to inefficiencies and potential unintentional actuation due to insufficient oil pressure across all vehicle gears.
Innovation Solution
A simplified actuation arrangement where a single valve controls both the transmission oil supply for the actuating device and the transmission shift element, eliminating the need for a separate parking lock valve, and incorporates a locking unit to fix the piston in engaged or disengaged positions, preventing unintentional movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate parking lock valve is associated exclusively with the actuating device to control transmission oil supply, then the actuation control is reliable, but the device complexity increases and the number of components multiplies
Solution Approach 1:
The valve is designed to perform multiple functions: it controls transmission oil supply to both the actuating device (for parking lock actuation) and the transmission shift element. This multi-functional design eliminates the need for a separate parking lock valve, reducing component count while maintaining reliable control through centralized valve management
2Ease of operation
If transmission oil is supplied into the cylinder cavity to move the piston, then the parking lock actuation is achieved, but unintentional piston movement may occur due to insufficient pressure in certain gears
Solution Approach 1:
The locking unit is designed to preemptively secure the piston in its desired position before oil pressure fluctuations can cause unintentional movement. By providing a mechanical locking mechanism that engages at specific positions, the system prevents potential actuation issues arising from insufficient oil pressure in certain gear conditions
3Reliability
If a locking unit is added to fix the piston in engaged or disengaged positions, then the piston position stability is improved, but the device complexity increases
Solution Approach 1:
The locking unit is integrated into the existing actuating device structure, combining the parking lock actuation function with the piston positioning locking function in a unified mechanism. This merging approach adds necessary locking capability while minimizing the increase in overall device complexity through shared structural elements
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 component complexity, ensures reliable actuation of the transmission parking lock, and prevents unintentional actuation by fixing the piston in desired positions, enhancing the system's simplicity and reliability.
Implementation Method 1
transmission oil is suppliable into the cavity to move the piston... The supply of the transmission oil into the cylinder cavity of the actuating device is controlled by a parking lock valve... an actuation of the transmission parking lock via the actuating device can be controlled or regulated by the valve
Data Source
AI summary
An actuation arrangement (23) including an actuating device for actuating a transmission parking lock (1). The actuating device having a piston (2) movable into an engaged position (E), which engages the transmission parking lock (1), and into a disengaged position (A), which disengages the transmission parking lock (1). The actuating device further has a cylinder (3) including a cavity (4), in which the piston (2) is arranged and into which transmission oil is supplied to move the piston (2), and a locking unit (5) configured for selectively fixing the piston (2). The actuation arrangement further includes a valve (13). When the valve (13) is in a first valve position, transmission oil is supplied to the transmission shift element (12) through a first line (14), to actuate the transmission shift element (12), and into the cavity (4) through the second line (15), to actuate the transmission parking lock (1).