How to replace the motor bearing, how to change the shaft of the motor?

Motor bearings should be checked from time to time and filled with grease in time. According to the different conditions of use, the oil should be changed once every six months to one year, and the decomposed liquid oil and solid residue should be washed off and replaced with new grease. The amount of oil injected is 1 2-2 3 of the volume of the bearing chamber.

Generally, industrial lithium grease is used, and if there are special requirements, it should be selected according to the requirements; In addition, different types of grease should not be mixed.

2) The steps to clean the bearing cover are:

a. Dig out the waste oil of the bearing cover;

b. Wash off the waste oil with gasoline or kerosene;

c. Put the bearing cover on a clean paper or cloth and let the gasoline or kerosene volatilize.

3) The steps to clean the bearing are:

a. Scrape off the waste oil on the bearing steel ball;

b. After wiping off the residual waste oil, soak the bearing in gasoline or kerosene.

Soft bristles brush the steel balls in the same direction;

c. Put the bearing in clean gasoline or kerosene and wash it clean;

d. Put the bearing on a clean paper or cloth and let the gasoline or kerosene volatilize.

When cleaning bearings, they are usually left on the shaft to avoid damage to the bearings during disassembly.

a. The grease must be kept pure, and dust, sand and metal particles should not be allowed.

particles and other impurities are mixed;

Generally, the tight fit can be hot-installed, that is, the bearing is heated in the oil and then installed, which can ensure the installation quality (and cold-installed); If the fit is too loose, the motor shaft can be turned by repair welding, pitted and sleeved. The bearing should not be filled with excessive grease, which is 1 2-2 3 of its volume, and impurities such as dust, sand and metal particles should not be mixed in.

Unplug the pulley with the pull code, remove the fan cover and fan blades, remove all the screws on both ends, if it is a small motor (the kind that can be moved), hold the motor axially and vertically downward to the abutment with a wooden pad, punch out the rotor and one of the end covers, and then use the same method to remove the other end cover. Now you can pull the old bearing down with a pull code. It is also best to disassemble the large motor vertically, so as to avoid damage to the stator winding and rotor during the disassembly and assembly process.

If you install it, it's very simple, you can use a sleeve, or you can use the hot loading method. Needless to say, the details will be said. (Note below:.)

This is for ordinary motors, and the precision high-speed spindle is discussed separately).

After the motor is removed, the motor wheel is removed with two crowbars symmetrically, if it is cast iron, the groove pulley should be pried next to the motor output shaft, otherwise the pulley will be broken, and the puller should be used as much as possible.

After removing the pulley, replace it with a tighter key or punch a hole taper buckle at the shaft end of the motor shaft, and measure the length and size according to the ideal position of the grooved pulley, and turn a sleeve and a shaft end gland.

Then ensure that the motor wheel will not move back and forth left and right, and tighten the shaft end gland with screws (plus spring washers). Once removed, it can be replaced in the same way.

In the motor and tun device repair industry, the disassembly method of small motor bearings, if there is no reasonable tool, it is often due to small losses and large losses, resulting in waste of materials. Here we introduce a special clamp for dismounting bearings. This tool is small and clever, easy to use, easy to make, it only takes ten minutes to make it after determining the disassembly object, and it can be applied to the small motor bearing disassembly method and 6-13 mm hand drill.

Before disassembly, the site should be cleaned up, tools should be prepared, and marks should be made on the connector line, end cover and shell, bearing cover and end cover, etc., so as to avoid mistakes during assembly. The general steps to disassemble the motor are as follows:

1) Remove the belt or disconnect the connecting pin of the oil coupler;

2) Remove the power wiring and grounding wire in the junction box;

3) Remove the pulley or coupling;

4) Remove the foot nut and washer;

5) Remove the front bearing cover;

6) Remove the front cover;

7) Remove the fan cover;

8) Remove the blades;

9) Remove the rear bearing cover;

10) Remove the rear end cover;

11) Pull out the rotor;

12) Remove the front and rear bearings and the inner cover of the front and rear bearings.

The assembly steps of the electric motor are reversed from the disassembly steps. For general medium and small motors, only remove the fan cover, fan blade, front bearing cover and front end cover, and the rear bearing cover and rear end cover are withdrawn together with the front and rear bearings, bearing inner cover and rotor. ;

Summary. 1) Remove the protective covers at both ends of the vibrating motor (there is no protective cover for the vertical vibrating motor), and record the percentage value of the excitation force when the eccentric block is working, so as to restore the original working state during installation; (2) Remove the shaft at the end of the two shafts with retaining rings; (3) Unscrew the outer eccentric block to fasten the bolts, remove the outer eccentric block, and remove the shaft key if there is an axis key. Unscrew the inner eccentric block to fasten the bolt, and remove the inner eccentric block; (4) Remove the bearing seat hold-down bolt, screw into the bearing seat with a suitable bolt to remove the screw hole, and eject the bearing seat from the casing; (5) Remove the bearing gland from the bearing seat, press the bearing out of the bearing seat or eject it with suitable bolts; (6) If the bearing is a cylindrical roller bearing with a separable inner and outer jacket, the inner sleeve of the bearing should be removed from the shaft and put into the outer sleeve of the original bearing; (7) Thoroughly clean the oil stain of each part.

1) Remove the protective covers at both ends of the vibrating motor (there is no protective cover for the vertical vibrating motor), and record the percentage value of the excitation force when the eccentric block is working, so as to restore the original working state during installation; (2) Remove the shaft at the end of the two shafts with retaining rings; (3) Unscrew the outer eccentric block to fasten the bolts, remove the outer eccentric block, and remove the shaft key if there is an axis key. Unscrew the inner eccentric block to fasten the bolt, and remove the inner eccentric block; (4) Remove the bearing seat hold-down bolt, screw into the bearing seat with a suitable bolt to remove the screw hole, and eject the bearing seat from the casing; (5) Remove the bearing gland from the bearing seat, press the bearing out of the bearing seat or eject it with suitable bolts; (6) If the bearing is a cylindrical roller bearing with a separable inner and outer jacket, the inner sleeve of the bearing should be removed from the shaft and put into the outer sleeve of the original bearing; (7) Thoroughly clean the oil stain of each part.

1) The bearing is washed with kerosene, pressed into the bearing seat, filled with Shell No. 3 lithium grease to two-thirds full to the roller of the outer ring of the bearing, applied evenly with clean hands, installed the bearing gland, and pressed the bearing gland with the fastening bolt coated with bolt anti-loosening glue; (2) The bearing is a cylindrical roller bearing with separable inner and outer jackets, and the inner sleeve of the bearing should be placed on the rotating shaft and in place; (3) Install the bearing seat on the casing, if there is a grease oil injection hole, it must be aligned with the position. Press the bearing seat with a fastening bolt coated with bolt anti-loosening glue; (4) The inner and outer eccentric blocks are installed on the rotating shaft and in place, and those with the shaft key should be loaded into the keyway and then installed the outer eccentric block, and the shaft is installed on the rotating shaft with a retaining ring; (5) Tighten the fastening bolt of the eccentric block, rotate the adjustable eccentric block to reach the angular position before unloading and tighten the fastening bolt. After the above assembly is completed, the rotating shaft should have a certain axial series movement; (6) The protective covers at both ends of the upper vibration motor are fastened with screws.

Tutorial source.

New energy electric vehicles are the crystallization of today's era and have been widely welcomed by the public, so many people have bought electric vehicles, but do you know about cars? Today, after work, let's introduce how to replace the bearings of electric vehicles. How to replace electric bearings in automobiles:

Introduction 1Open the seat of the electric car, remove the screws on the seat, and locate the main controller. 2.

Follow the wires on the rear axle, find the connecting plug between the motor and the controller, remember where the wires are, and pull out the motor wires one by one. To replace the bearings, first remove the motor power cord and hall wire, remember the color, and then remove the screws on both sides of the motor, so that you can see the bearings on the stator. You need to replace them together.

3.Remove all screws on the rear wheel and rear wheel motor. How to replace electric bearings in automobiles:

Introduction 4Mount the rear wheel horizontally with the screw side down. 5.

Place a plate on the shaft, hit the rear axle with a hammer, remove the motor cover and replace the bearing. 6.Put it back in reverse order.

For the replacement of electric vehicle bearings, there are six steps to introduce. So, after the introduction, do you know anything about the replacement of electric vehicle bearings?