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Isolation of vibrations in the oil sump of an engine

IP.com Disclosure Number: IPCOM000033195D
Publication Date: 2004-Dec-01
Document File: 2 page(s) / 55K

Publishing Venue

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Abstract

Internal combustion engines for motor vehicles are lubricated with oil from an oil sump which is screwed to the bottom of the engine block. For reducing transport of vibrations from the engine to the oil sump each fastening screw is provides with a spring around the screw and which act as an axial damper between the screw and the sump. According to the present invention, transport of vibrations from the engine block to the oils sump is further dampened by arranging a rubber tube around the fastening screws thereby avoiding the screws to be in radial contact with the respective springs.

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Isolation of vibrations in the oil sump of an engine

Internal combustion engines are used extensively for propelling motor vehicles. The engines are usually lubricated with oil from an oil sump arranged at the bottom of the engine. The oil from the oil sump is distributed in the engine with an oil pump. The oil sump is usually screwed to the bottom of the engine block. As oil sumps are not subject to strong forces they might be manufactured from relatively thin material, which is advantageous in that weight is saved in this way. A problem with the oil sump is, however, that it may function as a resonance cavity for vibrations that originate from the engine block due to the internal combustion. The resonance in the oil sump leads to noise, which becomes stronger with a thinner material in the oil sump.

According to the present invention, noise from the oil sump is reduced by reducing the transport of vibrations from the engine block to the oil sump. Fig 1and Fig 2 show schematically a part of an oil sump 1 being attached to an engine block 9 by means of screws of which a first screw 7 is shown in the figures. A compressible seal 4 is arranged between the oil sump 1 and the engine block 9. The first screw 7 is arranged through a hole 11 in the oil sump and screwed into the engine block 9. The first screw 7 comprises a flange 6 defining how deep the first screw 6 may be screwed into the engine block 9. The first screw 7 also comprises a head 10. A helical spring 2 is arranged surrounding the first screw 7 between the head 10 and the oil sump 1.

A washer 5 is arranged between the helical spring 2 and the oil sump 1. A rubber tube 3 is arranged in contact with and surrounding the first screw 7, and is surro­unded by and in contact with the helical spring 2. The rubber tube comprises a flange 8, which has a slightly larger diameter than the hole 11 in the oil sump. As the helical spring 2 is com­pressed in the state shown in Fig 1 the helical spring w...