NSK development goes high-powered prevent creep bearing

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  • source:ESKRIDGE CNC Machining
Japanese essence is versed in (NSK) faces the room that do not have dirt to use the utility such as motor with fan motor and pump, the bearing that development went creep-resistant to raise 20 ％ above than before " without creep bearing " , already began sample to offer money. This product is in up to June 29, 2007 " technology of the 11st mechanical element is exhibited " on undertook revealing. Fan motor reachs the bearing that pump motor uses, when because get,motor is assembled restrict, undertake installing below the position that clearance of the existence between outer annulus and housing needs below most circumstance (clearance fit) . Here condition falls, if prejudicial bear brought to bear on on bearing, differ as the condition, the opposes directional motion phenomenon that outer shroud can appear to direction of rotation " creep " , can shorten because of wear and tear the life of bearing. Especially in recent years, because motor is quantified increasingly gently, accordingly, the case that use aluminium alloy makes housing is in grow in quantity. Below this kind of circumstance, the difference that because heat expands,measures, with previously cast-iron make housing photograph compare, the clearance between bearing and housing increases, because this is incidental creep. Come so, because give out heat and the wear and tear that coordinates a side, the deterioration that will produce grease reachs leak, consequently noise increases, perhaps produce agglomeration to reach come off wait for a phenomenon. Additional, motor still can produce housing wear and tear, vibration and noise to increase, the phenomenon of loss of life. Annulus of 2 O form was loaded in outer shroud without creep bearing. The bounce of annulus of form of O of have the aid of reachs repulsion, compare with the bearing photograph that does not have O form annulus, have the creep-resistant of 2 times above. Additional, the measure of groove of outer shroud external diameter that adopts the dimension that optimizes O form annulus, bounce, repulsion and annulus of installation O form, raised creep-resistant 20 ％ above than before. In addition, improved the material composition of O form annulus, the permanent deflection that leaves high temperature environment O form ring reduces the 1/5 previously. Because can be below 120 ℃ high temperature,develop stable creep-resistant, accordingly, can extend the maintenance deadline of bearing. Pass the improvement of O form annulus, still will be opposite ester kind the oil resistant sex of grease raises 7 times previously. The grease that assembles Fu of the besmear when motor to go up in bearing external diameter and housing internal diameter, can use mineral oil not only, still can use ester kind grease, accordingly, the operation sex when rising to assemble. CNC Milling CNC Machining