German BMF bearings BMF models BMF prices

BMF bearings are available in two structures: cylindrical bore and tapered bore. Cage materials include steel sheet and synthetic resin. Their characteristic is that the outer ring raceway is spherical, providing self-aligning capability to compensate for errors caused by misalignment and shaft deflection; however, the relative inclination between the inner and outer rings must not exceed 3 degrees.

BMF bearing introduction

Self-aligning ball bearings are bearings with spherical rolling elements assembled between an inner ring with two raceways and an outer ring with a spherical raceway. The center of curvature of the outer ring raceway surface coincides with the bearing center, thus providing the same self-aligning function as automatic self-aligning ball bearings. When the shaft or housing deflects, they can automatically adjust without increasing the bearing load. Self-aligning roller bearings can withstand radial loads and axial loads in both directions. They have high radial load capacity and are suitable for heavy load and impact load conditions. Bearings with a tapered bore in the inner ring can be mounted directly, or installed on a cylindrical shaft using a locking sleeve or withdrawal sleeve. Cages include stamped steel cages, molded polyamide cages, and machined copper alloy cages. Self-aligning ball bearings are available in two structures: cylindrical bore and tapered bore. Cage materials include steel sheet and synthetic resin. Their characteristic is that the outer ring raceway is spherical, providing self-aligning capability to compensate for errors caused by misalignment and shaft deflection; however, the relative inclination between the inner and outer rings must not exceed 3 degrees. They can withstand large radial loads and also certain axial loads. Since the outer ring raceway of this type of bearing is spherical, it has self-aligning performance. When the shaft bends or tilts under load, causing the relative inclination between the inner ring centerline and the outer ring centerline to not exceed 1°～2.5°, the bearing can still operate. Self-aligning ball bearings have two types of inner bores: cylindrical and tapered. The taper of the tapered bore is 1：1 2 or 1：30. To enhance lubrication performance, an annular oil groove and three oil holes are machined on the outer ring of the bearing.

BMF bearing features and structure

Primarily withstands radial loads, while also capable of withstanding smaller axial loads. Axial displacement of the shaft (housing) is limited within the clearance range. It has automatic self-aligning performance, allowing normal operation under conditions of small relative inclination between the inner and outer rings. It is suitable for components where the support seat bore cannot strictly guarantee coaxiality. Structural forms: Self-aligning ball bearings with dust covers and seals are filled with an appropriate amount of grease during assembly. They should not be heated or cleaned before installation, and no further lubrication is required during use. They are suitable for operating temperatures between - 30 ℃ and + 120 ℃. Main applications of self-aligning ball bearings: Suitable for precision instruments, low-noise motors, automobiles, motorcycles, and general machinery. They are the most widely used type of bearing in the mechanical industry.

BMF bearing sealing

Bearing seals can be divided into two categories: integral seals and external seals. Integral bearing seals refer to bearings manufactured with built-in sealing devices, such as those with dust covers or sealing rings. This type of seal occupies minimal space, is easy to install and remove, and has a relatively low cost. External bearing sealing devices are sealing mechanisms with various performance characteristics manufactured within components such as end caps. External bearing seals are further classified into non-contact seals and contact seals. Non-contact seals are suitable for high-speed and high-temperature applications and come in different structural forms, including clearance types, labyrinth types, and gasket types. Contact seals are suitable for medium and low-speed operating conditions, with common structural forms including felt seals and lip seals. Depending on the sealing requirements dictated by the bearing's operating conditions and environment, engineering designs often comprehensively apply various seal types to achieve better sealing performance. The selection of external bearing seals should consider the following main factors: the type of bearing lubricant (grease or oil); the bearing's operating environment and space constraints; advantages of the shaft support structure and permissible angular misalignment; the circumferential speed of the sealing surface; the bearing's operating temperature; and manufacturing cost.

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