| 摘要 |
A mass balancing mechanism of an internal combustion engine, in which the mechanism includes a compensation shaft (1, 1′) formed as a tubular carrier shaft (5, 5′) having a mounting point (10, 10′) for the radial mounting of the compensation shaft. The mechanism further includes an unbalanced mass (6) joined to the carrier shaft. A needle roller bearing (2) is used for a radial rolling bearing-mounting of the compensation shaft, with the needle rollers (11) of the needle roller bearing being in rolling contact with the mounting point which is configured as an inner raceway and possesses a width which is variable in peripheral direction, so that, in a region situated diametrically opposite a load zone in whose peripheral region the inner raceway is loaded by the radial load of the unbalanced mass which rotates together with the compensation shaft, a width (14) of the inner raceway is smaller than the length of the needle rollers and tapers clearly or is interrupted in peripheral direction. The tapering or interruption of the inner raceway is produced by one or more trough-shaped depressions (15, 15′) formed locally in the carrier shaft.
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