Bearing depiction: bearing equipment

Source: China Bearing Network Time: 2014-08-23

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Generally speaking; one shaft requires two fulcrums; each fulcrum can consist of one or more bearings. Reasonable bearing equipment should be considered after the shaft has the correct orientation in the machine, avoid axial turbulence and the shaft is heated and expanded. Do not kill the bearing and other elements.
There are three common methods of bearing equipment:
1. Double fulcrum one-way fixed bearing This kind of bearing is equipped with two angular contact ball bearings or tapered roller bearings which are usually used in two directions; two bearings each restrain the axial movement in one direction; as shown in Fig. 1 and Fig. 2; After adjusting the axial orientation of the bearing outer ring (Fig. 1) or the inner ring (Fig. 2); the bearing can reach the ambiguous clearance or the required pretension. The layout shown in Fig. 1 and Fig. 2 is cantilever support. Small bevel gear shaft. It can be seen from the figure; under the same condition of support interval b; the interval between pressure centers; L1 in Fig. 1; L2 in Fig. 2; and L1 < L2; The support rigidity is poor. In terms of heat deformation; the temperature of the shaft is generally higher than the temperature of the outer casing during operation; the axial and radial thermal expansion of the shaft will be greater than the thermal expansion of the outer casing; Pre-adjusted gaps; can be stuck; and the layout of Figure 2 can avoid this situation.
Fig.1 One of the small bevel gear shaft support layoutFig.2 The small bevel gear shaft support layout of the second deep groove ball bearing can also be used for the double fulcrum one-way fixed support; as shown in Figure 3. This kind of bearing is in the device; The thickness of the gasket between the end face of the end cap and the outer casing; leaving an axial gap of a few tenths of a millimeter between the outer ring of the bearing and the end cap; to properly compensate the elongation of the shaft due to the existence of the axial gap; Accurate axial positioning is not possible. Because the axial clearance cannot be too large (avoiding the shaft to oscillate back and forth under the alternating axial force effect); therefore, this support cannot be used in applications where the operating temperature is high.
Figure 3 The double fulcrum of the deep groove ball bearing is unidirectionally fixed 2 . Single-point fixed biaxially fixed shaft with large span (such as more than 350mm) and high working temperature; its thermal elongation is large; one point should be fixed in two directions; the other point supports the layout of the support. As a fixed bearing It should be able to accept two-way axial load; therefore, the inner and outer rings should be fixed in the axial direction. As a thermal bearing with a large thermal expansion of the shaft; if the inner and outer rings are used, the outer bearing is not required; only the inner ring is fixed; It should be able to swim axially in the hole of the seat; as shown in Figure A, if the cylindrical proton or needle bearing can be used, the inner and outer rings should be fixed; as shown in Figure B. When the axial load is compared Large time; as a fixed fulcrum, the combination of the radial bearing and the thrust bearing can be selected; as shown in Fig. C, two angular touch ball bearings (or tapered roller bearings) can also be used, "back to back" or "face to face". The layout of the combination; as shown in Figure D (left end two bearings "face to face" device).
Figure C has one end fixed and one end swimming support plan 3 3. The two heads are supported about a pair of herringbone gear shafts; because of the axial positive effect of the herringbone gears themselves; the axial fastening of their inner and outer rings of the bearing should be depicted as ensuring that only one axis is fixed relative to the frame. The axial bearing; the two bearings on the other axis must be swimming; to avoid the gear jam or the uneven force on both sides of the herringbone.
Bearing clearance and adjustment of the orientation of the parts on the shaft. The right fulcrum in Figure 1, C and the left fulcrum in Figure D; the clearance and preload of the bearing are adjusted by the gasket under the end cover; The layout in Figure 2; the clearance of the bearing is adjusted by the round nut on the wheel; the operation is not convenient, and the more suffocating is that the stress must be formed on the shaft to gather severe threads; strength.
When the bevel gear or worm is installed, it is generally required to adjust the axial orientation. For easy adjustment, the bearing whose axial direction is determined can be installed in a cup (see the tapered roller bearing in Figs. 1 and 2). The two-way thrust ball bearing in Figure C; the two angular touch ball bearings in Figure D); the cup is placed in the hole of the casing. After increasing or decreasing the thickness of the gasket between the end face of the cup and the casing; Or the axial orientation of the worm.

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