Forged Rhombic Seat External Spherical Ball Bearing

1. Product Structure Composition​

The stamped diamond pillow block bearing with spherical outer ring consists of a stamped diamond housing, a spherical outer ring bearing unit, a sealing assembly, and auxiliary mounting components. Each component is precision-designed and processed to work together for stable overall operation. The specific structural parameters are shown in the table below:

2. Working Principle​

In terms of rotational support, the equipment's drive shaft is connected to the bearing's inner ring via a transition fit (H7/k6). When the shaft rotates, it drives the inner ring to rotate synchronously, and the inner ring raceway transmits torque to the outer ring through the rolling elements. The outer ring remains stationary due to the interference fit (H7/p6) with the concave spherical surface of the stamped diamond housing. The rolling elements roll purely between the inner and outer ring raceways, converting sliding friction into rolling friction. The rotational resistance is reduced by more than 85% compared to sliding bearings, with a measured no-load starting torque ≤0.6N·m, ensuring smooth shaft operation. Meanwhile, it reduces component wear, achieving a service life of 6000-10000 hours under regular working conditions.​

The self-aligning function is realized through the spherical contact design between the outer spherical surface of the bearing's outer ring and the concave spherical surface of the diamond housing. When there is a slight coaxiality deviation (≤1.5°) during equipment installation or minor shaft bending (bending amount ≤0.12mm/m) due to temperature rise during operation, the outer ring can rotate flexibly in the concave spherical surface to automatically adjust the bearing's center position. This ensures uniform force distribution on the rolling elements (force unevenness ≤15%), avoiding raceway spalling and rolling element damage caused by local stress concentration (concentrated stress ≤2200MPa), and ensuring stable equipment operation even in non-ideal installation conditions.​

For load-bearing, the diagonal reinforcing ribs of the stamped diamond housing are optimized through finite element analysis, enabling uniform transmission of radial loads borne by the bearing to the equipment frame. The maximum deformation of the housing under a radial load of 12kN is ≤0.04mm (within the elastic range of the material). The rolling elements of the spherical outer ring bearing unit are arranged symmetrically (6-10 pieces), and combined with the high compressive strength of GCr15 steel (≥1900MPa), it can stably bear a radial load of ≤12kN and a slight axial load of ≤2.5kN, suitable for supporting medium-light load rotating components (such as small conveyor rollers and fan motor shafts).​

3. Application Scope​

Based on the characteristics of "flexible diamond structure adaptation + medium-light load bearing + basic protection", the stamped diamond pillow block bearing with spherical outer ring is widely used in medium-light load scenarios requiring compact installation and multi-directional fixation. In the general machinery field, it can be used for supporting the motor shafts of small axial fans (e.g., Type 4-79) and micro centrifugal pumps (e.g., Type ISG). The diamond housing can adapt to the irregular installation spaces of fan casings and pump bodies; it is also suitable for the fan shaft rotating parts of household exhaust fans and industrial exhaust fans. Its lightweight design (single set weight 0.6-1.8kg, 35% lighter than cast iron diamond housings) reduces the overall weight of the equipment, facilitating installation and disassembly.​

In the light industry manufacturing field, it can be adapted to the conveyor rollers of small packaging machines (e.g., semi-automatic carton sealers) and the transmission shafts of small desktop cosmetic filling machines. The mounting holes in the diagonal direction of the diamond housing enable multi-angle fixation (0°, 45°, 90°), meeting the needs of compact equipment layouts; it can also be used for auxiliary yarn guide rollers of textile machinery (e.g., small winding machines). The IP44 protection level can handle slight flying flocs in the workshop, ensuring clean operation of the bearing.​

In the field of civil and small equipment, this bearing can be used for the mixing shafts (non-food contact end) of commercial soymilk machines and juicers. The basic protection can block liquid splashing during equipment operation; it is also applicable to the auxiliary rotating parts of small agricultural machinery (e.g., electric lawn mowers). The diamond housing structure can adapt to the irregular frames of agricultural machinery, reducing installation difficulty; when used for the cooling fan shafts of outdoor advertising light boxes, the hot-dip galvanized anti-rust treatment can resist the outdoor humid environment, extending the service life.​

In the field of automation accessories, the guide rollers of lightweight conveyors in automated production lines and the rotating shafts of small positioners (load-bearing ≤30kg) can rely on the multi-directional installation feature of the diamond housing to adapt to the support needs of different positions in the production line; the roller shafts of small warehouse sorters use this bearing, and its medium-light load bearing capacity (≤12kN) can meet the transportation of single-piece goods (≤20kg), ensuring stable operation and low maintenance costs.​

4. Maintenance Points​

Daily inspections should be conducted every 5-7 days, focusing on the operation sound (normal is a uniform "buzzing" sound; abnormal sounds such as "squeaking" friction require shutdown), housing temperature (normal ≤65℃; temperatures exceeding this require checking for overloading or insufficient lubrication), sealing component status (check for damage and oil leakage, replace in case of problems), and bolt tightness (tighten slightly with a wrench to prevent loosening due to vibration).​

Lubrication maintenance cycles should be adjusted according to the environment: once every 250-300 hours in regular environments, and once every 120-150 hours in dusty/humid environments. During operation, use a grease gun to inject Grade 2 lithium-based grease through the inner ring oil injection hole (use Grade 3 lithium-based grease for oil-resistant scenarios). The injection amount should be 1/3-1/2 of the bearing's internal space to avoid increased resistance due to excessive grease; mixing different types of grease is prohibited, and low-temperature grease (e.g., special lithium-based grease for -30℃) should be used in low-temperature environments (≤-10℃).​

Regular overhauls should be carried out every 4-6 months. First, loosen the mounting bolts to remove the bearing unit (avoid colliding with the concave spherical surface), then rinse the old grease and impurities inside the bearing with kerosene and dry it with compressed air (air pressure ≤0.4MPa); subsequently, use a 10x magnifying glass to inspect the raceways and rolling elements. Replace if the wear amount exceeds 0.01mm or the crack length exceeds 1.5mm; finally, apply new grease and install it in the original position, tightening the bolts to the specified torque.​

For fault handling, if rotation jamming occurs, it is mostly due to insufficient lubrication or impurity intrusion, requiring grease replenishment or bearing cleaning; if the temperature rises sharply (>70℃), it may be due to overloading or excessive installation deviation, requiring load reduction or installation position adjustment; if the sealing component fails, replace it with a new one of the same model in a timely manner to prevent further impurity intrusion.

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