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NSK cylindrical hole bearing device approach
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In addition; when operating; should be oiled on the cooperation surface in advance. In case of hitting the device with a hoe, it is necessary to put a block on the inner ring. This practice repeatedly forms bearing damage; therefore; only limited to small interference The condition; can not be used for large interference or medium and large bearings.
Non-displacement bearings such as deep groove ball bearings; inner and outer rings are required for interference devices; as shown in Figure 2; with screw or oil pressure; use the spacer to press the inner and outer rings together. Self-aligning ball bearings The outer ring is easy to skew; even if it is not an interference cooperation; it is also the best pad device.
Separate bearings such as cylindrical roller bearings and tapered roller bearings; the inner and outer rings can be respectively mounted on the shaft and the bearing seat. When the inner ring and the outer ring are respectively assembled, the key points are firmly closed; The two are in violation of each other; barely press in will form a roll to the surface.
Hot-packing method <br> Large-sized bearing; requires a lot of force when pressing; so it is difficult to work. Therefore; widely used hot-packing method: heating the bearing in oil; making it swell; then loading it on the shaft. This method; the device will not present a situation of improper force; can shorten the working time.
The heating temperature of the bearing; the bearing scale, the required interference; refer to Figure 3. Resolution. Precautions for hot loading operations;
(a) Bearing heating does not exceed 120 ã‚šC.
(b) In order to prevent the bearing from touching the bottom of the oil sump; the bearing should be placed on a metal grid; or hoisted.
(c) In order to avoid operation; it is difficult to install due to the lower inner ring temperature; the bearing should be heated 20 ° C higher than the required temperature by 30 ° C.
(d) After the device; the bearing is cooled; the width direction is also shortened; so use a shaft nut or other suitable method; lock it; to prevent a gap between the inner ring and the bearing shoulder.
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