Torque Coupling Layout With Dry Clutch Chamber Isolation
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Solution Overview
Problem
Existing torque transmitting devices in hybrid drive trains face reliability and cost issues due to the risk of functional impairment from liquid contact, particularly with the separating clutch.
Innovation Solution
A torque transmitting device design featuring a dry separating clutch with a separate fluid chamber for the clutch, utilizing a K0 clutch and a multiple disc friction device, where the actuation element is moved by fluid pressure to transmit torque, and includes a centrifugal pendulum for vibration dampening, reducing the risk of liquid-induced impairment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the separating clutch is sealed in a liquid-tight manner with the torque converter and electric machine, then the structure is more integrated and compact, but the risk of liquid contact causing functional impairment increases
Solution Approach 1:
The housing is divided into a first fluid chamber containing the torque converter and a second fluid chamber containing the separating clutch, with the chambers separated by a partition. This segmentation allows the clutch to operate in a separate, isolated environment free from liquid contact while maintaining overall system integration.
Solution Approach 2:
The separating clutch is extracted from the liquid-filled environment of the torque converter by placing it in a separate second fluid chamber that is free of liquid. This extraction eliminates the harmful liquid contact while preserving the integrated structure through shared housing and connection components.
2Device complexity
If the separating clutch operates wet in the same fluid chamber as the torque converter, then the structure is simpler, but the cost increases due to potential functional impairment and maintenance requirements
Solution Approach 1:
The housing is segmented into separate fluid chambers using a partition, creating distinct wet and dry operating environments. This segmentation prevents liquid contact with the clutch while maintaining a compact integrated structure, avoiding the cost implications of liquid-induced functional impairment.
3Device complexity
If the actuation element is moved by fluid pressure from the first fluid chamber, then the actuation mechanism is simplified, but the risk of liquid leakage affecting the clutch increases
Solution Approach 1:
A partition acts as an intermediary barrier between the first fluid chamber and the second fluid chamber, allowing fluid pressure to be transmitted to the actuation element while preventing direct liquid contact with the separating clutch. This mediator enables simplified fluid-pressure actuation while maintaining clutch reliability.
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 design enhances the reliability and cost-effectiveness of the separating clutch by preventing liquid contact and ensuring reliable operation, while maintaining efficient torque transmission through a dry clutch mechanism.
Implementation Method 1
The actuation element can be moved by a fluid pressure
Implementation Method 2
A centrifugal pendulum can be arranged in the first and/or second fluid chamber
Implementation Method 3
includes a centrifugal pendulum for vibration dampening
Implementation Method 4
The liquid in the second fluid chamber can effect spray cooling of the separating clutch
Data Source
AI summary
A torque transmitting device for transmitting torque between a first drive element and an output element, having a torque transmitting unit with a housing delimiting a first fluid chamber filled with a liquid, and a separating clutch arranged outside of the torque transmitting unit and the first fluid chamber in a second fluid chamber separated from the first chamber and which selectively transmits torque between the first drive element and the torque transmitting unit. The separating clutch has a clutch output that is connectable to a clutch input via a friction device and a clutch actuator that comprises a pressing element and an actuation element to which fluid pressure can be applied to move the actuation element. The pressing element is arranged within the second fluid chamber, and the actuation element is at least partly arranged within the first fluid chamber so that pressure is applied thereto by fluid pressure.