Lock-up Clutch Torsional Vibration Damper Integration
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Solution Overview
Problem
Current hydrokinetic torque coupling devices and torsion damping systems in automotive drivelines face limitations in effectively damping torsional vibrations and noise transmission, leading to inefficiencies and increased costs.
Innovation Solution
A hydrokinetic torque coupling device with a lock-up clutch and torsional vibration damper, featuring a locking piston with drive teeth engaging window-shaped mating openings on an input member, and elastic members to smoothly transmit torque while damping vibrations, is designed to enhance performance and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a torsion damping device is positioned between the drive shaft and transmission shaft, then torsional vibrations are damped before entering the transmission, but the device complexity increases
Solution Approach 1:
The patent combines the torsion damping device with the lock-up clutch into a single integrated assembly. The damping device includes an input member with drive teeth that engage with drive teeth on the locking piston, merging the vibration damping function with the clutch engagement function. This integration reduces overall device complexity while maintaining effective torsional vibration damping.
Solution Approach 2:
The locking piston serves multiple functions: it acts as both the clutch engagement mechanism and the input member for the torsion damping device. The drive teeth on the piston provide both clutch engagement and torque transmission to the damping device, making the component universal and reducing the need for separate dedicated parts.
2Object-affected harmful factors
If circumferentially acting elastic members are mounted in series between input element and output element, then effective torsional vibration damping is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The torsion damping device is segmented into distinct functional components: the input member with drive teeth, the circumferential elastic members, and the output member. This segmentation allows each component to be manufactured and assembled separately, reducing the overall manufacturing precision requirements while maintaining effective vibration damping through the series arrangement of elastic members.
3Power
If drive teeth are provided on the locking piston to non-rotatably couple with the input member, then torque transmission efficiency is improved, but the ease of manufacture decreases
Solution Approach 1:
The drive teeth are pre-formed as integral features of both the locking piston and the input member during their respective manufacturing processes. This preliminary formation of engagement features allows for straightforward assembly by simple axial engagement, maintaining ease of manufacture while ensuring positive non-rotatable coupling for efficient torque transmission.
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 effectively dampens torsional vibrations and noise, improving driveline efficiency by selectively engaging the lock-up clutch and using elastic members to smooth torque transmission, thereby enhancing the overall performance and reducing operational costs.
Implementation Method 1
a plurality of circumferentially acting elastic members, and an output member elastically coupled to the input member trough the elastic members
Implementation Method 2
The circumferential elastic members are interposed between the torque input member and the torque output member... allow temporary but controlled rotational connection of the drive shaft to the transmission shaft
Implementation Method 3
The drive teeth of the locking piston drivingly engage the window-shaped mating openings of the input member so as to non-rotatably couple the locking piston and the input member of the torsional vibration damper
Data Source
AI summary
A hydrokinetic torque coupling device comprises a casing rotatable about a rotation axis, a torque converter including an impeller wheel and a turbine wheel disposed in the casing coaxially with the rotation axis, a locking piston including an annular piston body and a plurality of drive teeth unitary with the piston body, and a torsional vibration damper comprising a input member non-rotatably coupled to the drive teeth of the locking piston, elastic members and an output member elastically coupled to the input member trough the elastic members. The locking piston is axially moveable so as to selectively engage the locking piston against the casing. The input member has window-shaped mating openings complementary to each of the drive teeth. The drive teeth drivingly engage the mating openings of the input member so as to non-rotatably couple the locking piston and the input member.