Driveshaft assembly having a noise reduction structure

Details Driveshaft assembly having a noise reduction structure Driveshaft assembly having a noise reduction structure

B - Operations, Transporting

60

K

B60K 17/22 (2006.01) F16C 3/02 (2006.01)

Patent

CA 2215446

A noise reduction structure for an aluminum-based driveshaft tube includes a generally cylindrical member having a predetermined length. The noise reduction structure is disposed within a driveshaft tube in a press fit relationship with the inner surface of the tube. In general, the noise reduction structure is positioned within the driveshaft tube at a location where the amplitude of a standing wave caused by the reflection of the sound waves back and forth along the driveshaft tube is at its maximum value. The length of the noise reduction structure may be about 10% or less of the value of the length of the driveshaft tube. In a first embodiment, the noise reduction structure is formed from a polymeric foam material having a density of less than about 10 lb/ft3. Preferably, the material has a density in the range of about 2 lb/ft3 to 10 lb/ft3, and more preferably, in the range of about 3 lb/ft3 to 7 lb/ft3. One type of material which is particularly well suited for this invention is a polymeric cushioning foam having a density of about 5 lb/ft3. In a second embodiment, the noise reduction structure is foamed from a plurality of relative long cylindrical members that are press fit within the driveshaft tube and are located equidistantly from one another. Each of these cylindrical members is preferably foamed from a polyether material having density of at least 1.4 lb/ft3, and most desirably are formed having a density of 1.5 lb/ft3. In a third embodiment, the noise reduction structure is formed from a single elongated cylindrical member that is press fit within the driveshaft tube and is preferably formed from a polyether material having density of at least 1.4 lb/ft3, and more desirably is formed having a density of 1.5 lb/ft3. One or both of the end portions of the driveshaft tube may be formed having a reduced diameter.

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