Gear Wheel Elastomer Track for Acoustic Damping
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Solution Overview
Problem
Existing solutions fail to effectively reduce low-frequency acoustic emissions in balancer shaft gears of reciprocating internal combustion engines, as measures like helical gearing and backlash reduction are inadequate for low-frequency noise, and elastic supports with elastomers are prone to damage and detachment under impulse loads.
Innovation Solution
A gear wheel design featuring a U-shaped elastomer track between the ring gear and hub part, providing a soft radial rigidity to decouple impulse paths and reduce bearing forces, with a silicone elastomer and sintered materials for durability and acoustic damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional elastic supports with elastomers are used to reduce bearing forces, then bearing forces are reduced, but the elastomer is destroyed through cracking under impulse loads
Solution Approach 1:
The elastomer is pre-compressed between the ring gear and hub part during assembly, creating a pre-load that allows it to absorb subsequent impulse loads without exceeding its elastic limits. This beforehand cushioning prevents the elastomer from being destroyed by sudden force peaks during operation.
Solution Approach 2:
The elastomer is selected with specific material parameters (shore hardness 50-90, tensile strength ≥10 MPa, elongation at break ≥50%) to optimize its ability to withstand impulse loads. By carefully selecting and controlling these material parameters, the elastomer achieves both the softness needed for force reduction and the strength needed for durability.
2Object-generated harmful factors
If the elastomer is made softer to reduce bearing forces, then acoustic emissions are reduced, but the elastomer detaches from gear wheel components in lubricant mist
Solution Approach 1:
The solution combines the elastomer with mechanically robust components (ring gear and hub part made of steel or sintered material). This composite structure allows the elastomer to provide acoustic damping while the rigid components maintain structural integrity and prevent detachment in the lubricant mist environment.
Solution Approach 2:
The elastomer is selected with specific material parameters (shore hardness 50-90, tensile strength ≥10 MPa, elongation at break ≥50%) to optimize its ability to withstand impulse loads. By carefully selecting and controlling these material parameters, the elastomer achieves both the softness needed for force reduction and the strength needed for durability.
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
This design significantly reduces acoustic emissions by minimizing bearing forces and preventing stress peaks, ensuring the gear wheel's longevity and effective torque transmission, even in a lubricant mist environment.
Implementation Method 1
a soft radial rigidity of the elastomer (4)
Implementation Method 2
The U-shaped cross section of the elastomer (4) ensures durability, in particular when operating in a mist of lubricant. The ring gear (3) of the gear wheel (1) is guided by an elastomer track (4) on the hub part (2) of the gear wheel (1)
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The gear wheel (1) is coaxially separated by a gap in a hub portion and a ring gear, where the gap is filled with an elastomer. The gear wheel takes place on a hub-portion side or sprocket-side, where a cross section of the elastomer partially encloses the circumference of an U-shape on a drive side or output side of a drive portion or an output portion. The elastomer is a silicone material.