CC Type Spherical Roller Bearing

CC-type spherical roller bearings are basic models in the spherical roller bearing family, focusing on medium-low speed, heavy load, and high cost-effectiveness. Their core features are "symmetrical spherical rollers + stamped steel cages". Through the precise adaptation of spherical rollers to the spherical raceways of the inner ring, they can automatically compensate for installation misalignments between the shaft and bearing housing (angular misalignment ≤ 1.5°). Meanwhile, cost optimization is achieved through the use of stamped steel cages, making them mainstream supporting components in industries such as metallurgy, mining, and general machinery, capable of "bearing radial-dominated combined loads and balancing performance with cost". Although their basic dynamic load rating is 10%-15% lower than that of CA-type bearings (with integral brass cages) of the same size, their cost is reduced by 20%-30%, and they are suitable for a speed range of 300-2500r/min, accurately meeting the core demand of "qualified performance and controllable cost" in medium-low speed and heavy-load scenarios.​

I. Product Structure: Balanced Design for Load-Bearing and Cost​

The structure of CC-type spherical roller bearings is developed around "basic function guarantee + cost optimization", with each core component tailored to adapt to medium-low speed and heavy-load scenarios:​

(I) Core Component Design​

Symmetrical Spherical Rollers: Adopting a double-row symmetrical layout, the rollers have a spherical profile, and the center of curvature of the spherical surface coincides with the bearing axis to ensure the realization of the self-aligning function. The roller diameter ranges from 10mm to 50mm depending on the bearing model. High-purity GCr15SiMn bearing steel is used, undergoing integral forging and quenching-tempering treatment (quenching temperature: 850-880℃, tempering temperature: 180-200℃). The hardness reaches HRC 60-63, and the impact toughness is ≥ 10J/cm², enabling them to bear heavy radial loads and small axial loads under medium-low speed conditions. The roller surfaces undergo super-finishing grinding, with roughness controlled within Ra ≤ 0.2μm, and are also subjected to crowning modification (crowning value: 0.005-0.01mm), which effectively reduces the contact stress at the raceway edges and avoids early failure caused by local wear.​

Stamped Steel Cages: High-strength cold-rolled steel plates (SPCC ordinary cold-rolled steel plates or SUS304 stainless steel plates; the latter is suitable for slightly corrosive scenarios) with a thickness of 1.5-3mm are used, formed through stamping processes such as blanking, drawing, and punching. The overall weight is 30%-40% lighter than that of CA-type brass cages. The cage pockets adopt an "arc transition" design, and the fit clearance with the rollers is precisely controlled between 0.1-0.15mm, ensuring flexible rotation of the rollers without jamming or movement during medium-low speed operation (≤ 2500r/min). The edges of the pockets are chamfered (chamfer radius: 0.2-0.5mm) to reduce frictional wear with the rollers during operation and extend the service life of the cage.​

Inner and Outer Rings: The inner ring is designed with a double-rib + spherical raceway structure, and the outer ring has a single-rib (double-rib for some models) + spherical raceway structure. Both the inner and outer rings are made of SUJ2 bearing steel, undergoing multiple processing procedures including integral forging, rough grinding, fine grinding, and super-finishing grinding. The geometric accuracy of the raceways reaches Grade P6 or above, with radial runout ≤ 0.01mm and end runout ≤ 0.008mm. The inner diameter surface of the inner ring can be processed with a tapered bore (suitable for adapter sleeve installation) as required, and the outer diameter surface of the outer ring can be processed with positioning grooves or coated with anti-rust coatings (such as zinc-nickel alloy coatings, with an anti-rust grade that can withstand 48 hours of salt spray testing without rusting), improving assembly convenience and environmental adaptability.​

(II) Self-Alignment Principle and Sealing Design​

Automatic Self-Alignment Principle: When there is an angular misalignment (≤ 1.5°) or parallel misalignment (≤ 0.4mm) between the shaft and the bearing housing due to installation errors or equipment deformation, the spherical rollers can adjust their contact positions adaptively along the spherical raceways of the inner ring. This ensures that the rollers maintain uniform contact with the raceways of the inner and outer rings at all times, distributing the load to the double-row rollers, avoiding raceway spalling or roller breakage caused by local overload, and ensuring stable operation of the bearing even under misaligned conditions.​

Sealing Structure: Basic models are equipped with "double-sided non-contact dust covers (ZZ)" or "double-sided contact seals (2RS)". The ZZ-type dust covers are formed by stamping cold-rolled steel plates with a thickness of 0.5-1mm, and are interference-fitted with the inner and outer rings, achieving an IP52 protection rating, which can block the intrusion of large particles of dust. The 2RS-type seals are made of nitrile rubber (NBR), with the lips in close contact with the inner ring, reaching an IP54 protection rating, which can effectively block the intrusion of dust, moisture, and a small amount of cooling fluid, making them suitable for general working conditions with humidity and dust. For harsh working conditions (such as dusty mining environments), a customized composite structure of "labyrinth seal + contact seal" can be used, which increases the protection rating to IP65 and further enhances dust and water resistance.​

II. Product Performance: Core Advantages for Medium-Low Speed and Heavy-Load Scenarios​

Heavy-Load Bearing Capacity: The basic dynamic load rating ranges from 300kN to 2000kN depending on the model. Taking the 22330CC model with an inner diameter of 150mm as an example, its basic dynamic load rating can reach 1200-1300kN, and the basic static load rating can reach 1800-1900kN. It can stably bear radial loads of 500-1200kN and axial loads of 125-400kN (the axial load is 1/4-1/3 of the radial load). The radial bearing capacity is 3-5 times that of deep groove ball bearings of the same size, meeting the basic load-bearing needs of medium-low speed and heavy-load equipment.​

Stability in Medium-Low Speed Operation: Suitable for a speed range of 300-2500r/min. Under the rated load at a speed of 2000r/min, the temperature rise is ≤ 55℃ (ambient temperature: 25℃), which is much lower than the tempering temperature of bearing steel (180-200℃), so there is no risk of grease deterioration. The operating noise is ≤ 75dB (measured 1 meter away from the bearing). Although it is higher than that of CA-type bearings (≤ 72dB), it still meets the noise requirements of general machinery (such as reducers with noise ≤ 85dB), and no additional noise reduction devices are needed.​

Impact and Wear Resistance: The high-strength material of the rollers and the crowning modification design enable the bearing to withstand impacts of 1.2 times the rated load for a short period (such as equipment startup impacts and material loading impacts) without obvious deformation or damage after impact. Under normal lubrication and good maintenance conditions, the bearing wear rate is ≤ 0.001mm per 1000 hours, and the service life can reach 12000-20000 hours, which is 2-3 times longer than that of deep groove ball bearings of the same size.​

Environmental Adaptability: It can operate stably within a temperature range of -30℃-150℃. At low temperatures (-30℃), the grease does not solidify, and the bearing rotates flexibly. At normal temperatures (20℃-80℃), it can be adapted to most general working conditions without special temperature control devices. In slightly corrosive scenarios (such as workshop environments with humidity ≤ 85%), models with SUS304 stainless steel cages can effectively resist rust and extend the service life.​

III. Product Model Classification: Adaptation Based on Installation and Working Conditions​

According to the installation method, structural details, and application scenarios, CC-type spherical roller bearings are mainly classified into the following mainstream model series, covering different sizes and functional requirements:

IV. Application Fields: Value Implementation in Medium-Low Speed and Heavy-Load Scenarios​

With the advantages of "high cost-effectiveness + basic heavy-load performance", CC-type spherical roller bearings are widely used in medium-low speed and heavy-load equipment that is cost-sensitive and operates under non-extreme working conditions:​

General Machinery Industry: Used as output shaft bearings for small and medium-sized gear reducers, they bear radial loads (500-800kN) and small axial loads generated by gear meshing, and are suitable for a speed range of 1000-2000r/min. The cost advantage can reduce the overall procurement cost of the reducer. As main shaft bearings for centrifugal pumps, they bear radial loads generated by fluid pressure during liquid transportation, and the 2RS-type seals effectively block liquid splashing to ensure long-term stable operation of the bearings.​

Mining Machinery Industry: The roller bearings of mining belt conveyors bear radial loads (800-1200kN) generated by the weight of the conveyed materials and are suitable for a speed range of 500-1000r/min. The stamped steel cages can withstand slight vibrations, and they are low-cost and easy to replace, reducing the spare parts inventory pressure of mining enterprises. The driven shaft bearings of small jaw crushers bear radial loads generated by ore crushing, and the automatic self-alignment function compensates for installation misalignments caused by frame deformation, avoiding local overload of the bearings.​

Metallurgical Auxiliary Industry: The sprocket shaft bearings of bucket elevators in metallurgical plants bear radial loads (600-1000kN) generated by material lifting and are suitable for a speed range of 800-1500r/min. No high-temperature protection is needed under normal temperature conditions, and the basic seals can block dust intrusion. The screw shaft bearings of screw conveyors bear heavy radial loads and slight impacts when conveying materials such as ore and coal, and the wear resistance of CC-type bearings ensures continuous operation of the equipment.​

Building Materials Industry: The auxiliary support bearings of cement rotary kilns bear the radial weight of the kiln body and materials (900-1100kN) and are suitable for a speed range of 300-800r/min. The automatic self-alignment function compensates for misalignments caused by thermal deformation of the kiln body, avoiding bearing jamming. The mixing shaft bearings of concrete mixing plants bear radial loads and impacts generated by concrete mixing. The stamped steel cages have strong stability at low speeds, and the cost advantage meets the cost-effectiveness requirements of the building materials industry for equipment.​

V. Installation and Maintenance: Ensuring Stable Performance​

(I) Installation Key Points​

Pre-Installation Preparation: Clean the inner and outer rings, raceways, and installation surfaces of the bearing to remove oil stains and impurities; inspect the appearance of the bearing to confirm there are no cracks, rust, or roller jamming; select appropriate tools according to the installation method. For example, adapter sleeve installation requires lock nuts and lock washers, while direct installation requires a press or heating device.​

Installation Methods: For small bearings (inner diameter ≤ 100mm), the cold installation method can be used. Use a press to evenly press the bearing onto the shaft journal, ensuring the pressure direction is parallel to the axis to avoid deformation of the inner and outer rings due to eccentric load. For large bearings (inner diameter > 100mm), the hot installation method is recommended. Heat the bearing to 80-100℃ (do not exceed 120℃ to prevent degradation of material performance), quickly fit it onto the shaft journal and position it, and the bearing will fit closely with the shaft journal after cooling.​

Post-Installation Inspection: After installation, manually rotate the bearing to confirm there is no jamming or abnormal noise; use a dial indicator to measure the radial runout and end runout of the bearing to ensure they meet the precision requirements (radial runout ≤ 0.01mm, end runout ≤ 0.008mm); add an appropriate amount of grease according to the working conditions. The filling amount of grease should be 1/3-1/2 of the internal space of the bearing to avoid excessive temperature rise caused by too much grease.​

(II) Maintenance Recommendations​

Regular Inspection: Check the operating temperature, vibration, and noise of the bearing weekly. If the temperature exceeds 65℃, the vibration velocity is > 3mm/s, or the noise increases significantly, stop the machine to inspect the lubrication condition and seal integrity; conduct a monthly visual inspection to check for cracks on the outer ring of the bearing and damage to the seals, and replace failed components in a timely manner.​

Lubrication Maintenance: Use lithium-based grease (such as ZL-3 lithium-based grease). Under normal temperature conditions, replenish the grease every 3000-5000 hours and completely replace it every 10000-15000 hours; under high-temperature conditions (100℃-150℃), use high-temperature lithium-based grease (such as ZL-4 high-temperature lithium-based grease), and shorten the replenishment cycle to 2000-3000 hours to ensure the bearing is always in a good lubrication state.​

Troubleshooting: If the bearing produces abnormal noise or excessive temperature rise, first check if the grease has deteriorated or the seal has failed. If the grease has deteriorated, thoroughly clean the bearing and refill it with grease; if the seal has failed, replace the seal. If the bearing has serious faults such as raceway spalling or roller breakage, stop the machine immediately to replace the bearing to avoid further equipment damage caused by the expansion of the fault.

VI. Core Product Advantages
High Cost-effectiveness: The stamped steel cage significantly reduces material and manufacturing costs, being 20%-30% lower than the CA type self-aligning roller bearings in cost. It maintains the basic heavy-duty and self-aligning performance, making it an economical choice for medium and low-speed heavy-duty scenarios in the mid-range market, helping enterprises control equipment procurement and maintenance costs.
Strong Installation Compatibility: It supports various installation methods such as locking sleeves, disassembly sleeves, or direct installation, adapting to different bearing journal sizes and equipment structures; the automatic self-aligning function reduces the installation accuracy requirements and shortens the installation and debugging time, especially suitable for the installation technical levels of small and medium-sized enterprises.
Wide Adaptability to Working Conditions: The basic sealing and material design are compatible with most general working conditions - 30°C - 150°C, humidity ≤ 85%. No additional customization is required to meet the needs of general machinery, mining auxiliary equipment and other scenarios; some models can be expanded to mild corrosion and dusty scenarios by replacing the cage material (such as SUS304) or upgrading the sealing structure.
Easy Maintenance: The stamped steel cage structure is simple, and the bearing is easy to disassemble and assemble, requiring no special tools during maintenance; the lubrication cycle is long, and the basic grease can meet the 3000 - 5000 hour operation requirements, reducing maintenance frequency and lowering the enterprise's operation and maintenance labor costs.

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