Torque Transmission Device with Segmented Stop Means
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Solution Overview
Problem
Existing torque transmission devices for motor vehicles lack effective means to limit angular deflections and prevent damage to elastic members, such as helical compression springs, due to excessive compression and contact between turns during high torque transmission.
Innovation Solution
A torque transmission device with three pairs of stops to limit rotation between the torque input element, torque output element, and phasing member, utilizing guide washers and an annular web with projecting elements to control angular deflection and prevent spring compression, thereby preventing damage from crushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pendulum masses are mounted on the phasing member to improve damping and absorb vibrations, then the damping performance is improved, but the phasing member exhibits very large inertia that can cause complete compression of elastic members in both forward and reverse rotation directions
Solution Approach 1:
The stop means are segmented into multiple pairs: first and second stop means between torque output element and phasing member, third and fourth stop means between torque input element and phasing member, and fifth and sixth stop means between torque input element and torque output element. This segmentation allows independent control of angular deflections at different locations in the torque transmission path.
Solution Approach 2:
The stop means act as intermediary elements that mediate between the high-inertia phasing member and the elastic members, preventing direct transmission of excessive compressive forces while allowing the phasing member to maintain its damping function.
2Reliability
If the elastic members are helical compression springs, then the elastic members provide effective damping, but excessive compression can bring the turns into contact with one another causing crushing, fatigue and premature wear
Solution Approach 1:
The stop means are positioned and dimensioned to prevent excessive compression of the helical springs before it can occur during operation. By establishing angular limits in advance through the stop means, the springs are protected from entering the dangerous compression zone where turns would contact and crush.
Solution Approach 2:
The high inertia of the phasing member, which initially causes harmful excessive compression, is converted into a benefit by using it for improving damping performance. The stop means enable the system to exploit the inertial damping effect while preventing the harmful compression through angular deflection control.
3Device complexity
If no means is provided for limiting the angular travel of the phasing member with respect to annular web elements, then the structure remains simple, but the elastic members can be completely compressed causing damage
Solution Approach 1:
The stop means are implemented as localized projecting elements on the annular web and corresponding recesses or stops on the phasing member, rather than requiring a complex overall structural modification. This localized approach provides the necessary angular travel limitation while maintaining relative structural simplicity.
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 limits angular deflections and prevents damage to elastic members by controlling compression and ensuring proper abutment, enhancing the durability and performance of the torque transmission device.
Implementation Method 1
elastic members mounted between the torque input element and the torque output element and acting oppositely to the rotation of the torque input element and the torque output element with respect to one another
Implementation Method 2
When the elastic members are helical compression springs, excessive compression of said springs can bring the turns into contact with one another. The turns are then said to be 'contiguous.' If the torque being transmitted is high, the turns experience crushing
Data Source
AI summary
A torque transmission device for a motor vehicle, having a torque input element (7a), a torque output element (24), and at least one group of elastic members (10a, 10b) mounted between the torque input element (7a, 7b) and the torque output element (24) and arranged in series by means of a phasing member (30). The torque output element (24) and the phasing member (30) have first (28a, 33a) and second stop means (28b, 33b) limiting their relative rotation in two opposite rotation directions (D, R), the torque input element (7a, 7b) and the phasing member (30) having third (34, 17b) and fourth stop means (34, 16b) limiting their relative rotation in two opposite rotation directions (D, R). Additionally, the torque input (7a, 7b) and output elements (24) have fifth (29, 16a) and sixth stop means (29, 17a) limiting their relative rotation in two opposite rotation directions (D, R).