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Structure Characteristics, Function and Measurement of Bearing End Cover

2020-05-27 14:16

1. typical bearing end caps:

The end cover here is a typical part of the roulette type. This part is the bearing end cover of the reducer. Because it can pass, it is also called the through cover. The basic body of the bearing end cover part is a coaxial rotating body, and the structure can be divided into a cylindrical tube and The disc has two parts, and its axial size is smaller than the radial size. There is a tapered inner hole (cavity) in the cylindrical barrel, and there is no notch on the edge, indicating that the bearing is grease lubricated; the outer cylindrical surface of the cylinder is matched with the bearing seat hole. There are six cylindrical countersunk holes on the disc, which are evenly distributed along the circumference. The function is to install threaded fasteners to connect the bearing end cover and the box body, so it is also called mounting holes. There is a sealing groove in the circular hole in the center of the disc to install a felt sealing ring to prevent the leakage of lubricating oil in the box and the intrusion of debris outside the box into the box.

the role of 2. bearing end cover:

Most small and medium-sized reducers use rolling bearings, and the bearing end cover of the rolling bearing is the most common part. The bearing end cover is used to fix the bearing, adjust the bearing clearance and bear the axial force.

Structural features of 3. bearing end cover:

BearingThe structure of the end cover has two types: embedded type and flange type, and each type is divided into stuffy cover and transparent cover,

1. The embedded bearing end cover has a simple and compact structure without fixing screws. Small outer diameter, light weight, short outer shaft size. However, it is difficult to assemble and disassemble the end cover and adjust the bearing clearance, and the sealing performance is poor. Slot on the seat hole, processing time-consuming. Embedded bearing end cover is mostly used in light weight and compact structure.

 

2. The flange type bearing end cover is convenient to install, disassemble and adjust the bearing clearance, and the sealing performance is good. So widely used. But the disadvantage is that the outline size is large, and a set of screws are needed to connect.

 

Note: When the fitting of the end cap and the hole is longer, in order to reduce the contact surface, cast or withdraw a section of smaller diameter at the end, but it must be kept with sufficient length e1. Generally, the matching length here is e1 =( 0.10-0.15) D,D is the outer diameter of the bearing, and the end face in the figure is recessed. The value of δ is also to reduce the processing surface.

Due to the end cover multi-cast iron casting. So it is good to consider the casting process. For example, when designing the through-type bearing end cover as shown in fig. 4, since the device seal requires a larger thickness of the end cover, the casting process should be considered at this time to make the thickness of the entire end cover uniform as much as possible,The preferred structure is shown.