Due to various reasons, the centroid or inertial main axis of the bearing retainer sleeve does not overlap with the center line of acceleration and rotation, resulting in unbalanced centrifugal inertia forces during operation. The coupling force and deflection value of the centrifugal inertia force are referred to as the unstable state of the motor rotor. This imbalance will inevitably lead to shaft system vibration, which affects the normal operation and service life of the equipment. Therefore, great attention must be paid to it.

Unbalance horizontal imbalance U is generally represented by multiplying the mass m of the motor rotor and the distance r from the centroid to the center line of rotation of the motor rotor, known as the mass diameter product. Also expressed as the product of mass and diameter per unit volume, it is called the axial force in the traditional geometric sense of eccentricity. MR is a relative quantity related to the mass of the motor rotor, and eccentricity e is a jd number that is independent of the mass of the motor rotor. The former is more vivid and mainly used for actual operation of a given rotor balance, while the latter is used to consider the quality of the motor rotor balance or test the balance accuracy. The balance level standard of the coupling is determined according to e. For a flexible rotor, the vibration eccentricity (N-order vibration) en=Un/mn, where Un. mn is the nth order vibration shape and the nth order multiform mass, respectively.

In order to correct or minimize the imbalance of the expansion sleeve, an appropriate balance level should be selected. After product production and equipment assembly, a balance level should be achieved within the specified balance plane of the expansion sleeve based on methods to improve or reduce the appropriate quality. This process is called balance correction and is commonly referred to as balancing.

The bearing fastening sleeve connection mainly features high heart accuracy, convenient assembly/adjustment/disassembly, high strength, stable and reliable connection, and protection of mechanical equipment from damage when overweight, especially suitable for transmitting overweight loads. It is widely used in industries such as heavy machinery and equipment, rubber and plastic machinery, food machinery and equipment, packaging equipment, textile equipment, printing equipment, CNC lathes, automation machinery, etc. (heavy machinery and equipment cling to shaft items).

Usage and connection advantages of bearing fastening sleeve: When loading, it relies on the combination of the expansion sleeve and the working pressure of the parts and shaft, as well as the resulting sliding friction force, to transmit the torque, radial force, or a combination of both.

Bearing fastening sleeve (also known as expansion sleeve, keyless rolling bearing, etc.) is a keyless connection device. Its design principle is mainly used for the effect of high toughness tensile anchor bolts. There is a great grip force between the inner ring line and the shaft, and between the outer ring line and the wheel rim, achieving a keyless connection between parts and shafts.

High quality expansion sleeves require correct installation steps to fully utilize the effect of connecting the expansion sleeve to the transmission system. Now let's talk about the general requirements for installation and safety protection of the expansion sleeve:

1) Preliminary preparations for the expansion kit

1. The size, tolerance, and appearance roughness of the fusion part shall comply with regulations

2. Prepare parts in advance and determine specifications and technical parameters.

3. Evenly apply thin lubricating grease to the fusion surface of the cleaned expansion sleeve (without molybdenum disulfide additive). The fusion surface must be cleaned No waste, corrosion resistance, no damage.

2） Install the bearing adapter sleeve

1. Change the connector to a shaft so that the design requires the location.

2. Install the expansion sleeve of the loose screw smoothly in the connecting hole between the transmission drum and the cast welding wheel rim of the transmission system to avoid deflection of the mixing components, and then tighten the screw.

3) Method of tightening the set screw

Use a torque wrench to evenly tighten the expansion sleeve in a diagonal and cross pattern.

The tightening torque MA of the screw shall be tightened according to the following process according to the relevant provisions in the performance parameters:

A. Tighten with 1/3MA value b. Tighten with 1/2MA value c. Tighten with MA value d. Check all screws with MA value

4) Safety protection of bearing fastening sleeve

After installation, apply antirust oil to the exposed port of the expansion sleeve and the top of the screw head.

For equipment working outdoors or persisting in a weak environment, antirust oil should often be applied to the exposed surface of the expansion sleeve end.

3. For expansion sleeves that need to work in corrosive substances, special safety measures should be taken (such as cover plates, sealing covers, etc.) to prevent rust from forming on the expansion sleeve.