Narrow-profile Vertical Outer Spherical Ball Bearing

1. Core Definition of the Product​

Essentially, it is a commonly used integrated bearing unit in the industrial field, with its core design being the in-depth combination of "spherical outer ring ball bearing + narrow vertical housing".​

It forms a unified whole through precise assembly, providing stable support for the transmission systems and supporting structures of mechanical equipment.​

Core advantages: Suitable for space-constrained scenarios, with prominent ease of installation, and universally applicable in multiple industries.​

2. Analysis of Structural Details​

(1) Spherical Outer Ring Ball Bearing Part​

Outer Ring Design: The outer diameter surface is ground into a standard spherical surface with high precision. The radius of curvature of the spherical surface is accurately calculated, and the fitting clearance with the inner hole of the housing is controlled within 0.02-0.05mm (to ensure the self-aligning function).​

Inner Ring Fitting: It adopts a transition fit (such as H7/k6 tolerance class) with the equipment shaft, balancing the firmness of assembly and the convenience of later disassembly and maintenance.​

Internal Components:​

Rolling Elements: Made of high-carbon chromium bearing steel (SUJ2) with G10 grade precision, and the hardness reaches HRC60-65 after heat treatment.​

Cage: Made of nylon 66 (PA66) or stamped steel plate, which reduces friction and collision between rolling elements and improves rotation accuracy and stability.​

Core Function: Compensates for installation errors within ±3°, alleviates the deflection deformation of the shaft during high-speed operation, and avoids local stress concentration and wear.​

(2) Narrow Vertical Housing Part​

Material Selection:​

Regular Type: HT250 gray cast iron, with a tensile strength of 250MPa, good rigidity and shock absorption, suitable for conventional industrial environments.​

Vibration-Resistant Type: QT450 ductile iron, whose toughness is more than 30% higher than that of HT250, suitable for high-vibration working conditions (such as construction equipment).​

Structural Advantage: The width is 15%-20% smaller than that of ordinary vertical housings (for example, for the model with a shaft diameter of 20mm, the width of the narrow housing is 38mm, while that of the ordinary housing is about 45mm), saving installation space.​

Functional Design:​

Mounting Holes: Holes with specifications of M10-M16 are set on the top, and the hole position tolerance is grade H9 to ensure accurate alignment of bolt connections.​

Wear-Resistant Bushing: High-end models are equipped with tin-bronze (ZCuSn10Pb1) bushings at the inner hole to reduce friction on the outer ring and facilitate separate replacement to reduce costs.​

Lubrication Structure: A straight-through grease nipple of M6×1 is equipped on the side or top. It is recommended to inject lithium-based grease (GB/T 7324), with a lubrication cycle of 200-300 hours (under conventional working conditions).​

3. Core Performance Characteristics​

(1) Ease of Installation​

Locking Methods: Regular models use set screws (such as 2 M5 set screws on the inner ring) and eccentric sleeves; high-end models adopt a double locking structure of "set screw + eccentric sleeve" (for example, UEPA206 model has an eccentricity of 0.5mm and a fitting clearance of 0.01-0.03mm).​

Disassembly Advantage: No special tools such as pullers are needed; the bearing can be separated from the shaft by loosening the set screw and rotating the eccentric sleeve, improving maintenance efficiency.​

Suitable Scenarios: Equipment with a rotating speed of ≤3000r/min.​

(2) Space and Self-Aligning Adaptability​

Space Adaptability: It can be embedded in equipment cavities with a width of only 50mm (such as the mixing shaft of food equipment). The flat design at the bottom of the housing allows direct fitting and installation without gaskets.​

Self-Aligning Ability: When the shaft is slightly misaligned, the spherical outer ring can rotate slightly in the inner hole of the housing to automatically adjust the force bearing, avoiding local overload of rolling elements.​

(3) Load-Bearing and Sealing Performance​

Load-Bearing Capacity:​

Radial Load: The diameter and quantity of rolling elements are optimized (for example, UEPA207 uses 10 rolling elements with a diameter of 8mm, and the rated radial load is 28.3kN).​

Axial Load: The rib structure on both sides of the inner ring can bear an axial load equivalent to 1/3 of the radial load, suitable for scenarios with slight axial movement (such as the tensioning shaft of a conveyor belt).​

Sealing Protection:​

Double-Lip Seal: Made of nitrile rubber (NBR), with a structure of "dust-proof lip + water-proof lip", a contact pressure of 0.1-0.2MPa, and an IP54 protection level, suitable for conventional dust/water environments.​

Labyrinth Seal: Equipped with 2-3 annular labyrinth grooves and sealing rings, which blinth grooves and sealing rings, which blocks impurities through air damping, suitable for high-dust environments (such as harvesters).​

Common Advantage: The grease leakage is ≤0.5g per 100 hours, ensuring long-term stable operation.​

4. Parameter Table of Common Models (UEPA2 Series)

5. Key Application Fields​

(1) Agricultural Machinery​

Application: Transmission systems of tractors, conveying devices of combine harvesters.​

Advantages: Labyrinth seal + cast iron housing prevents straw/mud water; QT450 housing resists vibration and reduces loosening; Recommendation for model selection: UEPA205 (matching radial load of 10-15kN).​

(2) Food Processing Equipment​

Application: Supporting shafts of conveyor belts, mixing devices.​

Advantages: Phosphated surface resists alkaline cleaning; double-lip seal prevents pollution, complying with GB 16798 standard; Recommendation for model selection: UEPA204 (suitable for conveyor belts with a width of 600mm).​

(3) Textile Machinery​

Application: Supporting of roller shafts.​

Advantages: Narrow housing enables dense arrangement (6-8 units per meter); radial runout ≤0.01mm ensures uniform yarn; Recommendation for model selection: UEPA206 (suitable for roller spacing of 50mm).​

(4) Construction Equipment​

Application: Mixing shafts of small mixers.​

Advantages: UEPA207 bears a load of 25kN; QT450 resists vibration of 10-20Hz; labyrinth seal blocks sand and gravel; service life in outdoor environments exceeds 5000 hours.

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