German Ringspann bearings Ringspann models Ringspann prices

Ringspann bearings are linear motion systems produced at low cost, designed for infinite travel in combination with cylindrical shafts. They are widely used in sliding components of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, and printing machinery.

Ringspann bearing selection

When selecting bearings, the main considerations are as follows: 1) Bearing load: The magnitude, direction, and nature of the load on the bearing are the primary factors in bearing selection. When selecting a bearing based on load magnitude, roller bearings feature line contact between main elements, unlike the point contact in ball bearings, making them suitable for carrying loads with minimal deformation under load. When selecting based on load direction: For pure axial loads, thrust bearings are generally selected. For larger axial forces, select thrust roller bearings. For smaller axial forces, select thrust ball bearings. For pure radial loads, deep groove ball bearings, cylindrical roller bearings, or needle roller bearings are generally selected. When subjected to radial loads along with small axial loads, deep groove ball bearings or tapered roller bearings may be selected; when axial loads are large, angular contact ball bearings with larger contact angles or tapered roller bearings may be selected. [2) Bearing speed: Generally, speed does not significantly affect the choice of bearing type, but high speeds must be included in the selection criteria. Compared to roller bearings, ball bearings have higher limiting speeds, so ball bearings are preferred for high-speed applications. For the same inner diameter, a smaller outer diameter means smaller rolling elements, resulting in lower centrifugal force on the outer ring raceway, making them more suitable for high-speed operation. According to the characteristics given in Table 1, needle roller bearings are relatively suitable for high-speed operation. 3) Bearing self-aligning performance: When the axis of the shaft does not coincide with the axis of the bearing housing, causing angular error, or when the shaft bends or tilts under load, misalignment of the inner and outer ring axes occurs. In such cases, self-aligning bearings with certain self-aligning capabilities or mounted spherical ball bearings should be used. Roller bearings are most sensitive to misalignment; their load capacity in misaligned states may be lower than that of ball bearings. Therefore, such bearings should be avoided when shaft stiffness and bearing housing support stiffness are low, or when large tilting moments are present. 4) Bearing installation and removal: When the bearing housing has no split plane and components must be installed and removed axially, separable inner and outer ring bearings (such as N0000, NA0000, 30000, etc.) should be preferred.

Ringspann bearing lubrication methods

Lubrication is critically important for bearings. Lubricants in bearings not only reduce frictional resistance but also dissipate heat, reduce contact stress, absorb vibration, and prevent corrosion. Common bearing lubrication methods include oil lubrication and grease lubrication. Solid lubricants are also used. The choice of lubrication method depends on the bearing speed. The dn value of the bearing (d is the bearing inner diameter, mm; n is the bearing speed, r/min) is generally used to indicate the bearing speed magnitude. The figure shows the dn value limits for grease lubrication and oil lubrication.

Ringspann bearing installation methods

Before starting the assembly of rolling bearings, clean the rolling bearings to keep them clean and tidy; then inspect the rolling bearings and assemble them according to assembly requirements. 1) First, remove residual grease and anti-rust oil from the rolling bearings. 2) Rinse the rolling bearings with kerosene, then wash with gasoline, and dry with a clean cloth. 3) Other cleaning agents may also be used to clean the bearings, wiping them dry with a cloth. 4) Never use dirty oil, dirty cloth, or cotton waste to clean or dry bearings. Principles of rolling bearing assembly: Depending on bearing structure, size, operating conditions, and fit properties of bearing components, assembly pressure should be applied directly to the end face of the ring being fitted; pressure must not be transmitted through the rolling elements. Rolling bearing assembly generally includes press-fit assembly, temperature difference assembly, and power frequency induction heaters. 1) Rolling bearings should not be removed from components unless necessary; if removal is required, use correct tools and methods. 2) Before assembling rolling bearings, select appropriate cleaning agents and methods to clean them thoroughly based on the bearing's anti-rust method. 3) Before assembly, use internal and external micrometers to check the inner diameter of the bearing rings and the diameter of the shaft journal; the fit tolerance must meet drawing requirements. 4) When rolling bearings are installed in split bearing housings, there should be no gap between the bearing cover and the bearing housing mating surface, but a certain gap should be left at the parting lines on both sides of the bearing outer ring and housing. The side gap at the parting line can be measured and checked with a feeler gauge; if the gap is too small or "binding" occurs, scrape with a scraper to increase the gap, complying with the table "Clearance between Rolling Bearings and Split Bearing Housings." 5) Rolling bearing assembly methods include driving-in, press-fitting, and hot fitting. For the driving-in method, use a copper rod or sleeve as a force transmission tool during hammering to ensure symmetrical force application on the bearing. The press-fit method uses a press instead of hammering, still utilizing a sleeve to transmit force. For hot fitting, direct flame heating is strictly prohibited; use hot oil heated to 80~90℃, and the oil temperature should not exceed 100℃. During heating, the bearing must not contact the heating tank seat; suspend the bearing in the middle of the oil layer to avoid local overheating causing annealing. Heating time must not be less than 15min; assemble after the inner ring expands to the required dimension. Do not pause during hot assembly; install the bearing to the correct position quickly in one go. If the bearing cage is made of oil-sensitive plastic, water heating is preferred, but moisture must be wiped dry promptly after assembly. 6) Rolling bearing assembly must meet the following requirements: Inspect cleaned bearings; they must be free of damage and corrosion, rotate flexibly without abnormal noise. Verify the fit class and dimensions of the bearing with the shaft journal and bearing housing; proceed with assembly only if requirements are met. During assembly, pressure applied to the bearing must be evenly distributed and perpendicular to the end face; unilateral force application is prohibited. Select force application points based on assembly relationships; for example, when mounting a bearing on a shaft journal, pressure should be applied to the bearing inner ring. During assembly, ensure the bearing fits tightly against the shaft shoulder; the gap between tapered roller bearings or radial thrust bearings and the shaft shoulder must not exceed 0.05mm, and for other bearings, it must not exceed 0.1mm. Bearing covers and retaining rings must be flat and evenly tight against the bearing end face, with gaps adjusted as specified in technical documents. During assembly, orient the end of the bearing marked with specifications outward for easy inspection and replacement. After assembly, manually rotate to check for binding, then add an appropriate amount of grease. Sealing devices must be assembled as specified; no oil leakage is allowed after sealing. For single-row, double-row, and four-row tapered roller bearings and radial thrust bearings, check axial clearance during assembly and adjust according to bearing standards or technical documents. Various radial bearings, needle roller bearings, and spiral roller bearings must rotate flexibly after assembly. For grease-lubricated bearings, inject clean grease filling 65%~80% of the cavity volume; do not inject grease into oil-lubricated bearings. During bearing assembly, adjust axial clearance and axial preload (axial interference fit) in accordance with bearing standards or equipment technical documents.

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