Bearing Unites, Ball Bearing Unites, UC Type Ball Bearings Unites, Bearing Bracket,
Maintenance free type
The bearing maintenance free bearing unit contains high-grade Lithium-based grease, good for use over a long period, which is ideally suited to sealed-type bearings. Also provided is an excellent sealing device, unique to bearing, which prevents any leakage of grease or penetration of dust and
Water from outside, It is designed so that the rotation of the shaft causes the sealed-in grease to circulate through the inside space,
Effectively providing maximum lubrication, the lubrication effect is maintained over a long period with no need for replenishment of grease. To summarize the advantages of the bearing maintenance free bearing unit:
(1) As an adequate amount of good quality grease is sealed in at the time of manufacture, there is no need for replenishment this means savings in terms of time and maintenance costs.
(2) Since there is no need for any regreasing facilities, such as piping, a more compact design is possible.
(3) The sealed-in design eliminates the possibility of grease leakage, which could lead to stained products.
2.2 Relubricatable type
The bearing relubricatable type bearing unit has an advantage over other similar units being so designed as to permit regreasing even in the case of misalignment of 2° to the right or left. The hole through which the grease fitting is mounted usually causes structural weakening of the housing
However, as a result of extensive testing, in the bearing unit the hole is positioned so as to minimize this adverse effect In addition, the regreasing groove has been designed to minimize weakening of the housing while the bearing maintenance free type bearing unit is satisfactory for use under normal operating conditions indoors, In the following circumstances it is necessary to use the relubricatable type bearing unit:
(1) Cases where the temperature of the bearing rises above
100°c, 212°f: *- normal temperature of up to 200°c, 392°f heat resistant bearing units
(2) Cases where there is excessive dust, but space does not permit using a bearing unit with a cover.
(3) Cases where the bearing unit is constantly exposed to splashes of water or any other liquid, but space does not permit using a bearing unit with a cover.
(4) Cases in which the humidity is very high, and the machine in which the bearing unit is used is run only intermittently
(5) Cases involving a heavy load of which the cr/pr value is about 10 or below, and the speed is 10 rpm or below, or the movement is oscillatory.
(6) Cases where the number of revolutions is relatively high and the noise problem has to be considered; for example, when the bearing is used with the fan of an air conditioner
2.3 Special sealing feature
2.3.1 Standard bearing units
The sealing device of the ball bearing for the bearing unit is a combination of a heat-resistant and oil-proof synthetic rubber seal and a slinger of an exclusive bearing design. The seal, which is fixed in the outer ring, is steel reinforced and its lip, in contact with the inner ring, is designed to minimize frictional torque, the slinger is fixed to the inner ring of the bearing with which it rotates, There is a small clearance between its periphery and the outer ring, there are triangular protrusions on the outside face of the slinger and, as the bearing rotates, these protrusions on the slinger create a flow of air outward from the bearing. In this way, the slinger acts as a fan which keeps dust and water away from the bearing these two types of seals on both sides of the bearing prevent grease leakage, and foreign matter is prevented from entering the bearing from outside,
2.3.2 Bearing units with covers
The bearing unit with a cover consists of a standard bearing unit and an outside covering for extra protection against dust; Special consideration has been given to its design with respect to dust-proofing. Sealing devices are provided in both the bearing and the housing, so that units of this type operate satisfactorily even in such adverse environments as flour mills, steel mills, Foundries, galvanizing plants and chemical plants, where excessive dust is produced and/or liquids are used. They are also eminently suitable for outdoor environments where dust and rain are inevitable, and in heavy industrial
Machinery such as construction and transportation equipment
