Multistage Spring Clutch for Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Double clutch gear mechanisms in motor vehicles often suffer from noise and vibration issues during startup, load changes, and gear shifts due to gear rattle, start-up grab, and selection impacts, which existing designs fail to adequately address.
Innovation Solution
A double clutch gear mechanism with leaf-like spring segments having different spring characteristic curves, creating a multistage spring characteristic to manage torque transmission effectively, including a first coupling region for gear rattle damping, a second for bite point control and creep control, and a third for part- and full-load operations, achieved through various configurations of spring segments such as undulating steel plates or double packets in series or parallel connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage lining spring system is used in the clutch, then the structure is simple, but noise and vibration problems occur during creep processes, start-up, load changes, and gear changes
Solution Approach 1:
The single-stage lining spring system is divided into multiple spring segments with different spring characteristics. Each segment has a specific spring rate designed to activate at different torque levels, creating a multistage spring characteristic that reduces noise and vibration across various operating conditions while maintaining structural feasibility
Solution Approach 2:
The spring segments are designed with progressively increasing spring rates (different stiffness parameters). The first spring segment has a lower spring rate for low-torque conditions, while the second spring segment has a higher spring rate for high-torque conditions. This parameter variation allows the system to adapt to different load conditions and eliminate vibration problems
2Object-generated harmful factors
If leaf-like spring segments with different spring characteristic curves are implemented, then vibration problems are eliminated, but the device complexity increases
Solution Approach 1:
The clutch lining spring system is segmented into multiple leaf-like spring segments arranged in a specific configuration. Each segment has different spring characteristics (different spring rates and engagement points) that are optimized for specific torque ranges, allowing vibration elimination through coordinated operation of multiple segments
Solution Approach 2:
Different regions of the spring system have different local properties - the first spring segment has specific spring characteristics optimized for low-torque vibration control, while the second spring segment has different characteristics optimized for high-torque conditions. This local differentiation allows each segment to address specific vibration problems in its operating range
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 multistage spring characteristic effectively prevents gear rattle, start-up grab, and selection impacts, optimizing torque transmission across different load regions from 0 to 50 Nm, enhancing the harmonic behavior of the clutch system and allowing for both automatic and manual gear mechanisms.
Implementation Method 1
leaf-like spring segments having different spring characteristic curves with which a multistage spring characteristic is achieved
Implementation Method 2
friction disks arranged between the central disk and the pressure application plates
Data Source
AI summary
A gear mechanism for motor vehicles includes a double clutch gear mechanism with two part gear mechanisms and a double clutch which transmits torque from the engine optionally to one of the two part gear mechanisms, with a central disk connected to a drive disk, two outer pressure application plates which are also connected to the drive disk and are moveable in the axial direction relative to the central disk, and friction disks arranged between the central disk and the pressure application plates, wherein the friction disks consist of two support carrier disks arranged parallel to each other and moveably in relation to each other, between which leaf-like spring segments are provided. To eliminate vibration problems which can occur on start-up from standstill, on load-change processes and during the gear change, the leaf-like spring segments have different spring characteristic curves with which a multistage spring characteristic is achieved.