The working principle of CC type double row self-aligning roller bearing
CC type double row self-aligning roller bearing achieves automatic centering and efficient load bearing through its unique structural design. Its core principle can be divided into the following three parts:
1. Structural foundation: Double row rollers and spherical raceway
Double row drum shaped rollers: The inner ring of the bearing is equipped with two symmetrically distributed drum shaped rollers, and the contact surface between the rollers and the raceway is arc-shaped, which can disperse the load and reduce stress concentration.
Spherical outer raceway: The outer raceway is a part of the spherical surface, and its center of curvature coincides with the center of the bearing.
. This design allows the rollers to maintain uniform contact with the raceway even when the inner and outer rings are relatively inclined (such as due to shaft bending or installation errors), avoiding edge stress concentration.Inner ring without blocking edge and movable partition ring: The CC type inner ring has no blocking edge and a movable partition ring is set in the middle, allowing the roller to move freely in the axial direction and enhancing the flexibility of the adjusting heart.
.2. Automatic centering mechanism: compensates for installation errors and shaft deflection
Tilt compensation: When there is an angle error between the shaft and the bearing seat (such as shaft bending or installation misalignment), the geometric fit between the spherical outer ring raceway and the drum roller automatically adjusts the angle of the bearing inner and outer rings, ensuring that the contact point between the roller and the raceway is always in the optimal position.
.Alignment angle range: Generally, an alignment angle of 1 °~2.5 ° is allowed, depending on the bearing size series.
. For example, the centering angle of large bearings may be close to 2.5 ° to adapt to more complex working conditions.Bi directional axial load bearing: The special design of the outer ring spherical raceway and rollers allows the bearing to withstand bi-directional axial loads while limiting axial displacement within the clearance range to prevent excessive displacement.
.3. Load and lubrication optimization: high load and long life
High radial load capacity: The double row roller structure significantly increases the contact area and can withstand heavy radial loads (such as steel mills, crushers, etc.).
. For example, the rated dynamic load of CC type bearings is about 15% to 20% higher than that of CA type bearings of the same specifications.Steel plate stamping cage: Adopting stamping steel plate cage, the internal space is larger, which can accommodate more rollers or thicker lubricating grease layers, improve load capacity and reduce friction loss.
. Lubrication optimization design: Some models are equipped with lubrication grooves and oil holes on the outer ring (such as the rear code/W33), which facilitate the uniform distribution of lubricating grease, reduce wear, and extend service life.Comparative advantages of CC type and other self-aligning roller bearings
Comparison with CA type:
Internal space: CC type has no inner ring edge, larger internal space, can increase the number or length of rollers, and improve load capacity.
. Material of retaining frame: CA type adopts brass retaining frame, suitable for low-speed heavy load; CC type steel plate holders are more suitable for high-speed or high-temperature working conditions (such as paper making machinery, deceleration devices).Speed and friction: CC type has lower friction loss, and its maximum speed is about 10% to 15% higher than CA type.
.Comparison with E-type:
Structural difference: The inner ring of E-type bearing has no blocking edge and no intermediate ring, and the rollers are guided by the cage;
; The CC type guides the rollers through the movable partition ring, which enhances the flexibility of the soul.Application scenario: The E-type is suitable for high-speed and light load scenarios (such as gearboxes); CC type focuses more on heavy-duty and low-speed working conditions (such as rolling mill rollers).
Typical application scenarios
CC type bearings are widely used in the following fields due to their self-aligning performance and high load-bearing capacity:
Heavy industry: rolling mills, crushers, vibrating screens (bearing impact loads and shaft deflection).
.Transmission equipment: reducer, vertical seat self-aligning bearing (compensating for installation errors).
.Special environment: Steel plant equipment, port elevators (maintaining stability under high temperature or high humidity conditions).
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