Hydraulic Double Clutch Activation Control Device
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Solution Overview
Problem
Existing activation control devices for hydraulic double clutches face challenges in minimizing pressure drop during draining and ensuring safe operation, particularly in case of valve failure, which affects torque transmission and reaction time.
Innovation Solution
Incorporating a draining valve in each pressure line between the filling valve and the clutch pack, with a proportional pressure reducing filling valve and an on-off 3/2 draining valve, optimized by varying spool diameters and designs, provides redundant control and minimizes pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a draining valve is added in each pressure line, then reaction time is reduced and safety is improved, but device complexity increases
Solution Approach 1:
The pressure control system is segmented by adding separate draining valves in each pressure line (first pressure line 2 and second pressure line 4), allowing independent control and draining of each clutch pack pressure. This segmentation improves safety by providing redundant control options while maintaining manageable complexity through modular valve design.
Solution Approach 2:
The draining valves are positioned to provide beforehand cushioning by enabling rapid pressure release in case of filling valve failure. The valves are pre-configured with appropriate spool diameters (draining valve spool larger than filling valve spool) to ensure adequate draining capacity is available before failure occurs, minimizing pressure drop and reaction time.
2Loss of energy
If the draining valve spool diameter is increased, then pressure drop is minimized, but valve size and complexity increase
Solution Approach 1:
The spool diameter parameter of the draining valve is specifically increased relative to the filling valve spool diameter. This parameter change optimizes the pressure drop characteristics during draining operations, allowing faster and more efficient pressure release while maintaining a practical valve size through targeted dimensional adjustment rather than overall valve enlargement.
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
This configuration enhances the safety and efficiency of torque transmission by optimizing reaction time and providing a redundant control option, thereby improving the overall operating characteristics of the activation control device.
Implementation Method 1
a first pressure line 2 equipped with a filling valve 3... The filling valve is a proportional pressure reducing valve
Implementation Method 2
a draining valve 7 downstream of the filling valve 3... another valve for the purpose of shortening the reaction time of the entire activation control device
Data Source
AI summary
An activation control device for clutch packs of a hydraulic double clutch is described and illustrated, and in some embodiments comprises a first pressure line having a filling valve and leading from an oil pressure source to the first clutch pack; a second pressure line having a filling valve and leading from the oil pressure source to the second clutch pack; and first and second draining valves coupled to the first and second pressure lines, respectively, the first draining valve located between the filling valve of the first pressure line and the first clutch pack, and the second draining valve located between the filling valve of the second pressure line and the second clutch pack.