Multi-directional asymmetric surfaces for housings and housing covers and internal combustion engines comprising the same

Abstract

In one embodiment, a housing is disclosed. The housing includes an asymmetric surface portion having a periphery, the asymmetric surface portion comprising a plurality of asymmetric surface sections disposed about the periphery, each asymmetric surface section having a surface contour differing from the surface contours of the other surface sections. In another embodiment, an engine front cover is disclosed. The engine front cover includes a substantially circular asymmetric surface portion disposed concentrically about a crankshaft bore, the asymmetric surface portion comprising a plurality of asymmetric surface sections disposed substantially concentrically about the crankshaft bore, each asymmetric surface section having a surface contour differing from the surface contours of the other surface sections.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 673,526, filed July 19, 2012, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to housings comprising asymmetrical surface portions, and more particularly to housing covers comprising asymmetrical surface portions, and even more particularly to engine front covers comprising asymmetrical surface portions and internal combustion engines utilizing such housings and covers . Background technique [0004] The various shells and outer shells (including exterior or interior surfaces, or both) of the front engine cover in the vicinity of the front crankshaft seal include flat panels. These flat panels are subjected to various incident pressure waves during engine operation, including pressure waves propagating through the engine oil or propagating through the engine oil ...

AI Technical Summary

Problems solved by technology

[0005] Various technical solutions have been proposed to solve this problem, including the addition of structural ribs to increase the rigidity of the front cowling near the front crankshaft seal; however, due to the fact that this area of ​​the engine is very congested and the space available for the front cowl is limited, limits the possibility of using this method

This also limits the possibility of combining structural ribs to strengthen the bonnet

NVH damping pads have also been added to engine cowlings to address this issue, but their ability to attenuate all "tank" modes due to incident pressure waves is limited because these pads are typically designed to damp or Attenuates specific frequencies and must be applied to a predetermined location in order to damp the frequencies for which it was designed

NVH damping pads also add to the cost of the front cowl to which they are applied due to the material and labor costs associated with making them and due to the labor necessary to install them

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