The
additional bearing support device can effectively prevent foreign
double-metal connecting rod liner invasion of foreign objects, but this
additional sealing device will increase the axial size of the mechanism,
inconvenience to the use of bearings and installation and maintenance,
and its sealing performance It is influenced by the machining accuracy and position tolerance of the matching parts of the shaft diameter and the housing. The
sealed bearing can not only have a good sealed lubrication environment,
but also can solve the problem of the bearing location with JDB
graphite copper sleeve, and also can eliminate the complicated
lubrication system. Therefore,
it is recommended to use sealed bearings in areas where the structure
is compact and the sealing requirements are strict. The self-sealing of the bearing not only has a good dustproof and
sealing effect, but also can maintain the good running state during the
running of the bearing without supplying the lubricant and reduce the
maintenance cost.
The bearing's own seal is divided into composite bush contact and non-contact seals according to the structure. According to the contact form, it can be divided into radial seal and axial seal. According to the configuration of the seal ring, it can be divided into a single lip seal and a double lip seal. Non-contact seals are generally available with a dust cover and a rubber seal. Dust cover seal gap, only suitable for dust, rubber seal seal gap is small, there is a good sealing effect. Contact seal bearings are generally only rubber seals extremely auxiliary parts. Rubber
seal lip is a certain contact force with the bearing rotation part of
the interference, so as to play a good dust seal effect, but its lower
speed limit and greater friction torque.
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