Torque Transmission Device Spring Wire Bow Clasp Backlash Noise
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Solution Overview
Problem
Torque transmission devices with plug-in connections in motor vehicle drive trains experience noise and torsional vibrations due to tooth flank play caused by component tolerances, leading to inefficient noise insulation and increased surface pressure.
Innovation Solution
A torque transmission device with a bow clasp made of spring wire that preloads the internal and external toothing, reducing backlash and noise by applying elastic prestressing between the teeth, utilizing arcs that extend axially and tangentially to secure the connection and reduce tooth impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If backlash is provided in the plug connection to accommodate component tolerances and simplify assembly, then ease of manufacture is improved, but noise and torsional vibrations increase due to tooth flank play
Solution Approach 1:
The bow clasp applies preliminary prestressing force to the tooth flanks before torque transmission begins, pre-compressing the mating surfaces to eliminate backlash. This preliminary action ensures that when torque is applied, the teeth remain in continuous contact without impacting or creating noise, while still allowing for component tolerances in the initial assembly.
Solution Approach 2:
The bow clasp creates a preliminary counteracting force against the tooth flank play by continuously pressing the teeth together. This preliminary anti-action prevents the harmful impacts and vibrations that would otherwise occur during torque reversals or direction changes, effectively counteracting the noise-generating mechanism before it can occur.
2Object-affected harmful factors
If preload is applied to the teeth to reduce backlash and noise, then noise insulation is improved, but surface pressure on the teeth increases
Solution Approach 1:
The bow clasp applies prestressing force locally at the tooth flank contact surfaces rather than uniformly across the entire gear structure. This localized application of force eliminates backlash and reduces noise at the critical interface between mating teeth, while the overall gear structure and supporting components remain unaffected in terms of stress distribution.
Solution Approach 2:
The bow clasp modifies the contact parameters between the tooth flanks by applying a controlled prestressing force that changes the normal force at the contact surface. This parameter change eliminates the clearance (backlash) between teeth, ensuring continuous contact and reduced noise, while the force is optimized to minimize excessive surface pressure.
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 reduces noise and vibration by preloading the teeth, maintaining a rotationally locked connection while accommodating component tolerances, thereby enhancing noise insulation and reducing surface pressure.
Implementation Method 1
a bow clasp made of spring wire which prestresses the internal toothing (6) and the external toothing (8) against one another in the circumferential direction
Implementation Method 2
the arched clasp preferably forms an arc with spring clips that are axially expanded or axially folded over at the ends in relation to an axis of rotation of the torque transmission device
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to a torque transmission device (1), in particular for a drive train of a motor vehicle, having a hub part (5) with an internal toothing (6) and a shaft part (7) with an external toothing (8), the internal toothing (6) and the external toothing (8) forming a plug-in connection (4) with a rotating connection with tooth flank play. In order to prevent noise development at the plug-in connection (4), hub part (5) and shaft part (7) are prestressed with respect to each other in the circumferential direction by means of a sheet clip (9) made from a spring wire.