Tightening sleeve

According to different requirements for bearings and bearing blocks, the classification of bearing blocks is not entirely the same. When using them, it is necessary to carefully check the selection based on the design.

1 Classification according to the shape of the bearing seat:

1.1 Outer spherical bearing with seat, also known as bearing unit (SKF). When there is no bearing, it is called an outer spherical bearing seat. 1.1.1.1 The outer spherical bearing pedestal is divided into 200 series according to the series of bearings. 500 Series. 300 Series. 600 Series. XOO series.

1.2 The outer spherical bearing seat is divided into vertical seat (P seat), square seat (F seat), diamond seat (FL seat), circular seat (C seat), convex circular seat (FC seat), convex square seat (FS seat), concealed hole seat (PA seat), and suspended seat (FA seat) according to the shape.

Adapter sleeve is a detachable connector used for rolling bearings (especially tapered roller bearings and self-aligning roller bearings) to fit with shafts. Its core function is to achieve flexible assembly, positioning, and disassembly of bearings and non stepped shafts, while compensating for shaft diameter machining errors and simplifying shaft machining processes. Introduction to manufacturers of tight fitting sleeves, detailed explanation from the dimensions of characteristics, classification, and application scenarios:

1、 The core characteristics of the tight fitting sleeve

The design of the tight fitting sleeve revolves around the three major requirements of "convenient assembly, precise positioning, and easy disassembly", and has the following characteristics:

Simplify the machining of shafts

No need to machine steps or grooves on the shaft (traditional bearing assembly requires shaft shoulder positioning), only the optical axis is needed for use, greatly reducing the difficulty, cost, and cycle of shaft processing, especially suitable for large diameter long shafts (such as motor shafts, fan shafts).

Flexible adjustment and positioning

Tightening sleeve is usually a conical sleeve structure (with a cylindrical inner hole and a conical surface of 1:12 or 1:30 outer circle), which is matched with the conical surface of the bearing inner hole; By tightening the nut (matching locking nut), the bearing can be pushed to move axially along the conical surface, achieving "radial tightening" of the bearing inner ring, ensuring a seamless fit, and accurately controlling the pre tightening force of the bearing.

Easy to disassemble and maintain

Compared to interference fit (which requires heating/press disassembly), the tightening sleeve can easily remove the bearing by "loosening the locking nut+top loosening screw (some models)", greatly simplifying the equipment maintenance process and reducing damage to the shaft and bearing, especially suitable for scenarios that require frequent maintenance.

Compensate for errors and have strong adaptability

By adjusting the axial position of the tightening sleeve, the machining error of the shaft diameter or the installation deviation of the bearing can be compensated; The same type of tightening sleeve can be adapted to bearings with different inner diameters (matching pairs should be tapered), reducing spare parts inventory costs.

Compact structure, stable load-bearing capacity

The overall structure is compact and does not occupy too much axial space; After tightening, the inner ring of the bearing forms a rigid whole with the shaft and the tightening sleeve, which can effectively transmit torque and radial load, avoid loosening caused by vibration, and is suitable for high-speed and heavy-duty working conditions (such as motors and crushers).

2、 Main classification of tight fitting sleeves (by structure and purpose)

Ordinary type tightening sleeve (such as GB/T 276-2013 standard)

Core structure: cone sleeve body+locking nut+stop washer (some models);

Conicity: commonly used 1:12 (suitable for self-aligning roller bearings) or 1:30 (suitable for tapered roller bearings);

Applicable scenarios: General machinery, motors, pumps, and other conventional load scenarios.

Tightening sleeve with top loosening screw

Additional design: Process 1-2 radial top loosening screw holes at the large end of the cone sleeve;

Advantages: No need to knock during disassembly, the tightening sleeve can be separated from the shaft by screwing in the top loosening screw, protecting the surface accuracy of the shaft;

Applicable scenarios: high-precision equipment (such as machine tool spindles, precision motors).

Long cone tightening sleeve

Features: longer cone length, larger contact area for tightening, and more uniform pre tightening force;

Applicable scenarios: large bearings (inner diameter>200mm), heavy-duty equipment (such as crushers and rolling mills).

Removable tightening sleeve (in conjunction with the demoulding liner)

Combination structure: Tightening sleeve+retraction sleeve (used for positioning the outer ring of the bearing);

Advantages: It can achieve synchronous disassembly of the inner and outer rings of bearings, suitable for double row bearings or multi bearing combination assembly;

Applicable scenarios: Complex transmission systems such as large fans and papermaking machinery.