What are the precautions for spindle bearing installation?

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When the spindle bearing is installed, an equal pressure must be applied on the circumference of the ring end face, and the ring must be pressed in, and the bearing end face must not be directly knocked with a tool such as a hammer to avoid damage. The designer should consider the disassembly problem in the bearing installation part, and the bearing is generally installed with interference fit, so the shaft or the bearing housing hole should be provided with a groove for disassembly when designing, so as to facilitate the disassembly of the bearing. The use of mechanical press or hydraulic press must be pressed with the matching cylinder, and ensure that it is in a horizontal state, if there is an inclination, the bearing groove will be damaged due to the force, and the bearing will produce abnormal noise.

The mounting barrel should be in full contact with the entire circumference of the end face of the inner or outer ring of the bearing.

In the case of a small interference, the end face of the bearing ring can be pressed with a sleeve at room temperature, and the center of the matching cylinder can be lightly hit with a hammer, and the ring can be evenly pressed into through the sleeve. The assembly force must never be transmitted through the rolling elements to avoid direct hammering of the bearing ring. When pressing, it should be ensured that the end face of the outer ring and the end face of the shoulder of the shell, and the end face of the inner ring and the end face of the shoulder of the shaft table are compressed, and no clearance is allowed.

When the interference is large, it can be installed by heating box, oil bath heating or inductor heating bearing, and the heating temperature range is 80 100, and the maximum can not exceed 120. At the same time, the bearing should be tightened with a nut or other appropriate method to prevent the width of the bearing from shrinking after cooling and creating a gap between the ring and the shoulder.

The assembly quality of the spindle bearing directly affects its working state and service life, and the failure of many CNC machining centers is caused by the improper assembly of the bearing, so enough attention should be paid to the assembly technology of the bearing.

Three ways to install.

1. Cold installation, use copper rod or special cold sleeve for installation.

2. Heating installation, it is recommended to use electromagnetic induction heater for heating installation.

3. The hydraulic mode is limited to the installation of the tapered bore bearing or shaft head of the adapter sleeve or the withdrawal sleeve.

The mounting method of the bearing varies according to the bearing structure, fit and conditions, and in general, because the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, mostly pressed into by press, or mostly used by hot filling method. The field cracking or closing of the taper bore is mounted directly on the taper shaft or with a sleeve.

When installed in the housing, there is generally a lot of clearance fit, and the outer ring has an interference amount, which is usually pressed in with a press, or there is also a cold shrink fit method for installation after cooling. When dry ice is used as a coolant, the moisture in the air will condense on the surface of the bearing. Therefore, proper anti-rust measures are required.

Whether the bearing is installed correctly affects the accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of bearings. I want to install it according to the work standard. The items for the assignment standard are usually as follows:

1) Clean the bearing and bearing-related parts.

2) Check the size and finishing of the related parts.

3) Installation. 4) Check the state slip after installing the bearing.

5) Supply lubricant.

Disassemble the bearing with a special pull tool When disassembling with a special pull tool, put the foot of the pull tool on the inner ring of the bearing, but not on the outer ring, to prevent the bearing from being damaged, as shown in the figure. The apex of the screw should be aligned with the center of the shaft, and the tool should be parallel to the shaft, and the force should be uniform when turning the handle, and the rotation should be slow to prevent the bearing from being damaged too quickly. In order to make it easy to disassemble, some kerosene can also be infiltrated between the bearing ring and the rotating shaft before pulling.

Disassemble the bearing with a metal rod When there is no special pulling tool or it is not suitable to use the pulling tool to disassemble, the metal rod can be pressed against the inner ring of the bearing, and the metal rod can be hammered with a hand hammer to slowly knock out the bearing from the rotating shaft, as shown in the figure. In order to prevent damage to the bearing, the force should not be too violent, and the two opposite sides of the bearing should be knocked in turn, not only one side, so that the inner ring of the bearing is evenly stressed. Place the bearing on the cylinder and disassemble the bearing Place the bearing on the cylinder, pad two iron plates under the inner ring of the bearing, and then put the iron plate on a cylinder with an inner diameter slightly larger than the outer diameter of the rotating shaft, as shown in the figure.

In order to prevent the bending of the shaft and the deformation of the end, you should not directly hit the end face of the shaft with a hand hammer, but should pad a hardwood board or copper block on the end face of the shaft, and then hit the wooden board or copper block with a hand hammer. The point of force should be aimed at the center of the shaft when striking, and the force should not be too sharp. To prevent damage to the rotor or shaft when the bearing falls off, something soft should be placed on the bottom of the cylinder.

In addition, when the bearing gradually loosens, the striking force should also decrease.

The power output of the engine speed through the gearbox is converted into torque, and then the torque is converted into the driving force to achieve driving balance and intelligent movement. The transmission shaft is an important part of the power transmission in the automobile drive train, and its role is to transmit the power of the engine to the wheels together with the gearbox and drive axle, so that the car can generate driving force.

The precautions for the installation of the transmission shaft are as follows:

1. The two cross universal joint forks at both ends of the transmission shaft are in the same plane to ensure their constant velocity transmission;

2. The expansion joint should be installed at one end close to the transmission (or transfer case), so that the runout of the expansion joint can be reduced, so as to reduce the wear of the expansion joint: at the same time, the ground clearance of the expansion joint is increased;

3. Pay attention to the alignment of the balance mark, and all parts are installed according to the in-situ hole failure;

5. The locks of the two clamps of the dust jacket on the expansion joint of the transmission shaft should be installed in the radial opposite position (difference 1800).

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Keep it clean: Before installation, it is necessary to ensure that the bearing and the installation environment of the infiltration field are clean to avoid impurities such as dust and dirt from entering the bearing. At the same time, the operator should keep the hands and tools clean.

Inspect bearings and mounts: Before installation, the dimensions, shapes and surface quality of bearings and mounts need to be checked to ensure that they meet the requirements and that there are no defects such as damage or deformation.

Control the mounting force and direction: Precision bearings are usually installed with a slight pressure and should not use excessive force. At the same time, it is necessary to control the installation direction of the cluster type to avoid excessive eccentricity during installation.

Use the right tools: When installing precision bearings, you should use the right tools and avoid hitting with heavy objects such as copper hammers to avoid damaging the bearings.

Adjust clearance and lubrication: After installation, it is necessary to check whether the clearance of the bearing meets the requirements and make adjustments. In addition, proper lubrication is required to ensure that the bearings are well lubricated during operation.

Carry out the necessary protection: After installation, the necessary protection is required

The working principle of the propeller shaft is that the engine speed is converted into torque through the power output by the gearbox, and then the torque is converted into the driving force to achieve the drive. The transmission shaft is an important part of the automobile transmission system to transmit power.

Its role is to transfer the power of the engine to the wheels along with the gearbox and drive axle, so that the car can generate driving force. The installation precautions for the transmission shaft collapse ridge are as follows:1.

The two cross forks at both ends of the transmission shaft are in the same plane to ensure its constant velocity transmission;Collapse 2The expansion joint should be installed at one end close to the transmission (or transfer case), which reduces the maximum runout of the expansion joint and thus the wear of the expansion joint: at the same time increases the height of the expansion joint from the ground;3.

Pay attention to the alignment markings, all parts are installed in place;4.The fuel filler port of each transmission shaft should be in the same straight line, and the oil filler port of the universal joint cross shaft should be facing one side of the transmission shaft to facilitate lubrication;5.The two clamp locks of the boot on the expansion joint of the transmission shaft should be installed in a position opposite in diameter (1800° difference).