Excavator bearings include: excavator walking bearing, excavator slewing bearing, excavator needle roller bearing, excavator gearbox bearing, excavator walking motor bearing, excavator walking drive bearing, excavator joint bearing, excavator slewing support bearing and the inch non-standard bearing used in the excavator.

Introduction to the

The installation and disassembly method of the excavator bearing should be based on the structure, size and coordination nature of the excavator bearing parts. The pressure of installation and disassembly should be directly added to the end face of the closely matched excavator bearing ring, and the pressure can not be transmitted through the rolling body of the excavator bearing, because this will cause indentation on the working surface of the excavator bearing, affect the normal work of the excavator bearing, and even damage the excavator bearing. The cage, sealing ring, dust cover and other parts of the excavator bearing are easy to deform, and the pressure of installing or removing the excavator bearing can not be added to these parts.

Excavator bearing installation:

(1) The shift device is not properly adjusted. If the transmission of this type of excavator adopts the mechanical manual shift way, if the shift lever, longitudinal axis, horizontal axis and vertical fixed screws are loose, the transmission can also cause “jump gear”. Variable speed transmission mechanism wear

(2) Sudden change of external load due to the working nature of the excavator and its own design reasons, the sudden change of external load will also lead to its transmission “jump gear”. When the road surface is uneven, the excavator for downhill driving or driving route is improper and the external load suddenly changes, the sudden change of the load will act on the gear meshing gear of the transmission through the wheel and the transmission shaft, so that the gear meshing gear is removed because of the axial thrust, causing the transmission “jump gear”. The performance of the self-locking mechanism deteriorates

(3) The transmission mechanism of the shifting device of the excavator relies on the sliding gear sleeve to move axially on the fixed gear sleeve and meshes with the driven gear of each gear to realize the shifting. In the process of frequent gear shift, the tooth end face of the meshing gear is easy to be ground into a cone, resulting in the meshing performance is reduced and lead to “gear jump”.

(4) In order to prevent the transmission “jump gear”, the excavator in the transmission Ⅱ, Ⅲ and Ⅳ, Ⅴ gear fork shaft above the box cover hole and I, reverse gear fork are equipped with a self-locking effect of the steel ball and spring. When the spring elasticity of the positioning self-locking function is weakened or broken, the self-locking performance of the self-locking mechanism will decline until it disappears, resulting in the transmission “jump gear”. At the same time, if the groove on the positioning ball or fork shaft is worn, it can also cause the transmission “jump gear”.

(5) Improper operation method when the excavator drives on the ramp (especially downhill), if the operation is improper, it will also lead to the transmission “jump gear”.

Installation and disassembly methods of excavator bearings

The installation and disassembly method of the excavator bearing should be based on the structure, size and coordination nature of the excavator bearing parts. The pressure of installation and disassembly should be directly added to the end face of the closely matched excavator bearing ring, and the pressure can not be transmitted through the rolling body of the excavator bearing, because this will cause indentation on the working surface of the excavator bearing, affect the normal work of the excavator bearing, and even damage the excavator bearing. The cage, sealing ring, dust cover and other parts of the excavator bearing are easy to deform, and the pressure of installing or removing the excavator bearing can not be added to these parts.

(1) the excavator bearing inner ring and the shaft is a tight fit, excavator bearing outer ring and shell as a loose fit, available press will excavator bearing on bearing installation first, then the shaft together with the excavator bearings into shell, when pressed in excavator bearing pad on face a soft metal materials assembling casing or soft steel pipe (copper). The inner diameter of the assembly sleeve should be slightly larger than the journal diameter, and the outer diameter should be less than the retaining diameter of the excavator bearing inner diameter, so as not to press on the holder. A handle can be added to the casing when a large number of excavator bearings are installed.

When the excavator bearing is installed, the center line of the excavator bearing hole and the shaft should coincide. The relative shaft skew of the excavator bearing is not only difficult to install, but also can cause indentation, journal bending and even fracture of the excavator bearing inner ring.

In the absence or cannot use the press, the assembly sleeve and small hammer can be used to install the excavator bearing. The hammer force should be evenly spread to the entire circumference of the end face of the excavator bearing ring, so the end face of the assembly casing subjected to hammer should be made into a ball.

(2) the outer ring of the excavator bearing and the shell hole are tightly matched, and the inner ring and the shaft are loosely matched. The excavator bearing can be pressed into the shell first. At this time, the outer diameter of the assembly casing should be slightly smaller than the diameter of the shell hole.

(3) the inner ring and shaft of the excavator bearing, the outer ring and the shell hole are tightly matched. The end face of the assembly casing should be made into a ring that can press the end face of the inner and outer ring of the excavator bearing at the same time, or a disk and the assembly casing should be used to make the pressure spread to the inner and outer ring at the same time, and the excavator bearing is pressed into the shaft and the shell. This installation method is especially suitable for the installation of spherical bearings which can be self-aligning.

(4) Heating installation, the force required to install the bearing of the excavator is related to the bearing size of the excavator and the size of the interference amount. For the medium and large excavator bearings with large interference amount, the hot installation method is commonly used. Before hot loading, put the excavator bearing or separable excavator bearing ring into the oil tank or special heater to evenly heat to 80~100℃ (should not exceed 100℃).

Hot loading excavator bearings need skilled operation skills. When the excavator bearing is removed from the heating tank or heater, it should be immediately wiped with a clean cloth (not with cotton yarn) to wipe the oil stains and attachments on the surface of the bearing, and then put in front of the matching surface, and push the excavator bearing to the position of the shaft shoulder in one operation. In the process of cooling, it should always be pushed tight, or a small hammer should be used to tap the bearing of the excavator through the assembly sleeve to make it close. The bearing of the excavator should be slightly rotated during installation to prevent the installation from tilting or sticking.

When the outer ring of the excavator bearing and the shell hole are tightly matched, the shell can also be heated and loaded into the excavator bearing. In particular, the bearing seat of the excavator made of light metal may be damaged because the outer ring of the excavator bearing is pressed into the matching surface in the case of tight matching. At this time, the bearing seat should be heated