Germany CALEMARD bearings CALEMARD models CALEMARD prices

CALEMARD bearings are precision mechanical components that convert sliding friction between the rotating shaft and the bearing housing into rolling friction, thereby reducing frictional losses. Rolling bearings generally consist of four parts: inner ring, outer ring, rolling elements, and cage. The inner ring fits with the shaft and rotates with it; the outer ring fits with the bearing housing to provide support; the rolling elements are evenly distributed between the inner and outer rings by means of the cage, and their shape, size, and quantity directly affect the performance and service life of the rolling bearing; the cage ensures even distribution of the rolling elements, guides their rotation, and provides lubrication.

CALEMARD bearing classification

There are many types of plain bearings: 1) According to the direction of load they can withstand, they are divided into radial (centripetal) plain bearings and thrust (axial) plain bearings. 2) According to the type of lubricant, they are divided into oil-lubricated bearings, grease-lubricated bearings, water-lubricated bearings, gas bearings, solid-lubricated bearings, magnetic fluid bearings, and electromagnetic bearings, totaling 7 categories. 3) According to the thickness of the lubricating film, they are divided into thin-film lubricated bearings and thick-film lubricated bearings. 4) According to the bearing shell material, they are divided into bronze bearings, cast iron bearings, plastic bearings, jewel bearings, powder metallurgy bearings, self-lubricating bearings, and oil-impregnated bearings. 5) According to the bearing shell structure, they are divided into cylindrical bearings, elliptical bearings, three-lobe bearings, stepped-face bearings, tilting-pad bearings, and foil bearings. Bearing shells are divided into split and integral structures. To improve the friction properties of the bearing shell surface, one or two layers of anti-friction material are often cast on the inner diameter surface, commonly known as bearing lining. Therefore, bearing shells are also classified as bimetallic and trimetallic bearing shells. The bearing shell or bearing lining is an important component of plain bearings, and the materials for both are collectively referred to as bearing materials. Since the bearing shell or lining is in direct contact with the journal, and the journal part is generally more wear-resistant, the main failure mode of the bearing shell is wear. The wear of the bearing shell is directly related to the journal material, the bearing shell material itself, the lubricant, and the lubrication condition. These factors should be comprehensively considered when selecting bearing shell materials to improve the service life and operating performance of plain bearings.

CALEMARD bearing grease selection

1) When the bearing load is heavy and the speed is low, grease with low penetration should be selected; conversely, grease with high penetration should be chosen. For high-speed bearings, select grease with lower penetration and good mechanical stability. Special attention should be paid to ensuring that the viscosity of the base oil in the grease is relatively low. 2) The dropping point of the selected grease should generally be 20-30℃ higher than the operating temperature. In cases of continuous operation at high temperatures, ensure that the permissible operating temperature range of the grease is not exceeded. 3) When plain bearings operate in water-sprayed or humid environments, calcium-based, aluminum-based, or lithium-based greases with good water resistance should be selected. 4) Select grease with good adhesion. Selection of grease for plain bearings: Load<1MPa, journal circumferential speed below 1m/s, maximum operating temperature 75℃, select No. 3 calcium-based grease; load 1-6.5MPa, journal circumferential speed 0.5-5m/s, maximum operating temperature 55℃, select No. 2 calcium-based grease; load >6.5MPa, journal circumferential speed below 0.5m/s, maximum operating temperature 75℃, select No. 3 calcium-based grease; load<6.5MPa, journal circumferential speed 0.5-5m/s, maximum operating temperature 120℃, select No. 2 lithium-based grease; load >6.5MPa, journal circumferential speed below 0.5m/s, maximum operating temperature 110℃, select No. 2 calcium-sodium based grease; load 1-6.5MPa, journal circumferential speed below 1m/s, maximum operating temperature 50-100℃, select No. 2 lithium-based grease; load >5MPa, journal circumferential speed 0.5m/s, maximum operating temperature 60℃, select No. 2 calendering grease; in humid environments, at temperatures of 75-120℃, calcium-sodium based grease should be considered. In humid environments, if the operating temperature is below 75℃ and No. 3 calcium-based grease is unavailable, aluminum-based grease can be used. At operating temperatures of 110-120℃, lithium-based or barium-based grease can be used. For centralized lubrication, lower consistency is required. Lubrication cycle for plain bearings using grease: Occasional operation, non-critical parts: Shaft speed<200r/min, lubrication cycle once every 5 days; shaft speed >200r/min, lubrication cycle once every 3 days. Intermittent operation: Shaft speed<200r/min, lubrication cycle once every 2 days; shaft speed >200r/min, lubrication cycle once every 1 days. Continuous operation, operating temperature less than 40℃: Shaft speed<200r/min, lubrication cycle once every 1 days; shaft speed >200r/min, lubrication cycle once per shift. Continuous operation, operating temperature 40-100℃: Shaft speed<200r/min, lubrication cycle once per shift; shaft speed >200r/min, lubrication cycle twice per shift. It is necessary to ensure uniform and close contact between the journal and the plain bearing, while maintaining a certain fit clearance. This refers to the central angle subtended by the contact surface between the journal and the plain bearing. The contact angle should neither be too large nor too small. A contact angle that is too small will increase the pressure on the plain bearing, potentially causing significant deformation, accelerating wear, and shortening service life; a contact angle that is too large will affect the formation of the oil film, preventing effective liquid lubrication. Experimental studies have shown that the limit for the contact angle of plain bearings is 120°. When the plain bearing wears to this contact angle, liquid lubrication will fail. Therefore, under the premise of not affecting the compressive conditions of the plain bearing, a smaller contact angle is preferable. Theoretical analysis of friction torque indicates that the friction torque is minimized when the contact angle is 60°. Therefore, it is recommended that for plain bearings with speeds higher than 500r/min, the contact angle should be 60°; for plain bearings with speeds lower than 500r/min, the contact angle can be 90° or 60°.

CALEMARD bearing usage precautions

Plain bearings involve surface contact, so a certain oil film must be maintained between the contact surfaces. Therefore, the following issues should be noted during design: 1) Ensure that the oil film can smoothly enter the friction surface. 2) Oil should enter the bearing from the non-load-bearing area. 3) Do not place a full-circle oil groove in the middle of the bearing. 4) For oil pads, cut oil grooves at the joints. 5) Ensure that the oil ring provides sufficient and reliable lubrication. 6) Do not block the oil filling holes. 7) Avoid forming areas where oil does not flow. 8) Prevent sharp edges and corners that could cut the oil film. Plain bearings can also be lubricated with grease. When selecting grease, consider the following points: 1) When the bearing load is heavy and the speed is low, grease with low penetration should be selected; conversely, grease with high penetration should be chosen. For high-speed bearings, select grease with lower penetration and good mechanical stability. Special attention should be paid to ensuring that the viscosity of the base oil in the grease is relatively low. 2) The dropping point of the selected grease should generally be 20-30℃ higher than the operating temperature. In cases of continuous operation at high temperatures, ensure that the permissible operating temperature range of the grease is not exceeded. 3) When plain bearings operate in water-sprayed or humid environments, calcium-based, aluminum-based, or lithium-based greases with good water resistance should be selected. 4) Select grease with good adhesion.

Weidou Intelligent Technology specializes in selling German CALEMARD plain bearings, CALEMARD rolling bearings, CALEMARD spherical plain bearings, CALEMARD deep groove ball bearings, CALEMARD angular contact ball bearings, CALEMARD self-aligning ball bearings, CALEMARD thrust ball bearings, CALEMARD double-direction thrust angular contact ball bearings, CALEMARD combination bearings, CALEMARD thrust roller bearings, CALEMARD needle roller bearings, CALEMARD outer spherical ball bearings, CALEMARD self-aligning roller bearings, CALEMARD flanged bearings, CALEMARD linear bearings, CALEMARD original imports from Germany. Customers are welcome to inquire and order.