German zimmer Sommer bearings, zimmer Sommer models, zimmer Sommer prices

zimmer Sommer bearings are a type of rolling bearing. Spherical alloy steel balls are installed between the inner and outer steel rings to reduce friction during power transmission through rolling motion and improve the efficiency of mechanical power transmission. Ball bearings cannot withstand heavy loads and are common in light industrial machinery. Ball bearings are also called ball bearings.

zimmer Sommer bearing selection

When selecting bearings, the main considerations are as follows: 1) Bearing load. The magnitude, direction, and nature of the load borne by the bearing are the primary factors in bearing selection. When selecting a bearing based on load magnitude, compared to the point contact in ball bearings, the main components in roller bearings have line contact, making them suitable for bearing heavy loads with minimal deformation after loading. When selecting a bearing based on load direction, thrust bearings are generally selected for pure axial loads. Thrust roller bearings are selected for larger axial forces. Thrust ball bearings are selected for smaller axial forces. For pure radial loads, deep groove ball bearings, cylindrical roller bearings, or needle roller bearings are generally selected. When bearing radial loads along with small axial loads, deep groove ball bearings or tapered roller bearings can be selected; when axial loads are large, angular contact ball bearings with larger contact angles or tapered roller bearings can be selected. 2) Bearing speed. Generally, speed does not significantly affect the selection of bearing type, but when the speed is high, speed must be included in the bearing selection criteria. Compared to roller bearings, ball bearings have higher limiting speeds, so ball bearings are preferred in high-speed conditions. With the same inner diameter, a smaller outer diameter means smaller rolling elements, resulting in lower centrifugal force exerted by the rolling elements on the outer ring raceway, making them more suitable for high-speed operation. According to the properties 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 and there is an angular error, or when the shaft bends or tilts due to force, misalignment of the inner and outer ring axes of the bearing occurs. In this case, self-aligning bearings with certain self-aligning performance or mounted outer spherical ball bearings should be used. Roller bearings are most sensitive to bearing misalignment, and their load capacity in a misaligned state may be lower than that of ball bearings. Therefore, when the shaft stiffness and the support stiffness of the bearing housing bore are low, or when there is a large deflection moment, such bearings should be avoided as much as possible. 4) Bearing installation and disassembly. When the bearing housing has no split plane and components must be installed and disassembled axially, bearings with separable inner and outer rings (such as N0000, NA0000, 30000, etc.) should be preferred.

zimmer Sommer bearing lubrication methods

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

zimmer Sommer bearing installation methods

Before starting the assembly of rolling bearings, the rolling bearings need to be cleaned to keep them clean and tidy; then the rolling bearings are inspected and assembled according to their assembly requirements. 1) First, remove the 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 can also be used to clean the bearings, and wipe them dry with a cloth. 4) Remember, do not use dirty oil, dirty cloth, or cotton yarn to clean or dry the bearings. Principles of rolling bearing assembly: Depending on the bearing structure, size, working conditions, and the fit characteristics of the bearing components, the assembly pressure should be applied directly to the end face of the ring to be fitted, and pressure transmission through the rolling elements is not allowed. Rolling bearing assembly generally includes press-fit assembly, temperature difference assembly, and industrial frequency induction heaters. 1) Rolling bearings should not be removed from the machine parts if possible; if removal is necessary, correct tools and methods should be used. 2) Before assembling rolling bearings, appropriate cleaning agents and methods should be selected to clean them thoroughly based on the anti-rust method of the rolling bearings. 3) Before assembly, use internal and external micrometers to check the inner diameter of the bearing sleeve and the diameter of the shaft journal. The fit tolerance must meet the drawing requirements. 4) When rolling bearings are installed in split bearing housings, there should be no gap between the bearing cover and the mating surface of the bearing housing, but a certain gap should be left at the joint openings on both sides of the bearing outer ring and the bearing housing. The side gap at the joint opening can be measured and checked with a feeler gauge. If the gap is too small or "binding" occurs, use a scraper to scrape and increase the gap to comply with the table "Clearance between Rolling Bearings and Split Bearing Housings." 5) Rolling bearing assembly methods include driving-in, press-fitting, and hot mounting. When using the driving-in method, a copper rod or sleeve should be used as a force transmission tool 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. During hot mounting, direct heating with flame is strictly prohibited; use 80~90℃ hot oil for heating. The oil temperature should not exceed 100℃. The bearing must not contact the bottom or sides of the heating oil tank during heating; it should be suspended in the middle of the oil layer to avoid local overheating causing annealing. The heating time must not be less than 15min, allowing the inner ring to expand to the required value before assembly. The hot mounting process must not be interrupted; the bearing should be quickly installed to the correct position in one go. If the bearing's steel ball cage is made of oil-sensitive plastic, water heating is preferred, but moisture should be wiped off promptly after assembly. 6) During rolling bearing assembly, the following requirements must be met: Inspect the cleaned bearings to ensure they are free from damage and rust, rotate smoothly without abnormal noise, and verify the fit category and dimensions of the bearing with the shaft journal and bearing housing. Assembly can proceed only after meeting these requirements. During assembly, the pressure applied to the bearing should be evenly distributed and perpendicular to the end face, avoiding unilateral force. Select the force application point based on the assembly relationship; for example, when assembling a bearing onto a shaft journal, pressure should be applied to the inner ring of the bearing. During assembly, the bearing and shaft shoulder should be tightly fitted. The gap between tapered roller bearings and radial thrust bearings and the shaft shoulder must not exceed 0.05mm, and other bearings must not exceed 0.1mm. The bearing cover and retaining rings must be flat and evenly tight against the bearing end face, and adjustments should be made to leave gaps as specified in technical documents. During assembly, try to orient the side of the bearing marked with specifications outward for easy inspection and replacement. After assembly, manually rotate to check for any sticking phenomena, then add an appropriate amount of grease. Sealing devices must be assembled according to regulations, and there should be no oil leakage after sealing. For single-row, double-row, and four-row tapered roller bearings and radial thrust bearings, axial clearance should be checked during assembly and adjusted according to bearing standards or technical documents. Various radial bearings, needle roller bearings, and spiral roller bearings must rotate flexibly after assembly. For bearings using grease, inject clean lubricating grease into 65%~80% of the cavity volume. For bearings lubricated with thin oil, do not inject grease. When assembling bearings, the axial clearance and axial preload (axial pre-interference) to be adjusted must comply with bearing standards or equipment technical document regulations.

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