German BOSCH REXROTH bearings, BOSCH REXROTH models, BOSCH REXROTH prices

BOSCH REXROTH bearings are a type of rolling bearing and are widely used components in modern machinery. They support rotating parts through rolling contact between the main elements. Roller bearings are now largely standardized. Roller bearings offer advantages such as low starting torque, high rotational accuracy, and ease of selection. Rolling bearings are classified into ball bearings and roller bearings based on the rolling elements. Roller bearings support rotating parts through rolling contact between the main components. Different roller bearings can withstand different radial and axial loads. When selecting roller bearings, choices should be made based on specific operating conditions. The main structural types of roller bearings include self-aligning roller bearings, thrust self-aligning roller bearings, tapered roller bearings, and cylindrical roller bearings.

BOSCH REXROTH bearing selection

When selecting bearings, the main factors to consider 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, compared to the point contact in ball bearings, the main elements in roller bearings have line contact, making them suitable for heavier loads with less deformation after loading. When selecting a bearing based on load direction, thrust bearings are generally chosen for pure axial loads. Thrust roller bearings are selected for larger axial forces, while thrust ball bearings are chosen for smaller axial forces. For pure radial loads, deep groove ball bearings, cylindrical roller bearings, or needle roller bearings are generally used. When subjected to 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 used. 2) Bearing speed. Generally, speed does not significantly affect the choice of bearing type, but when speeds are 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 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 more suitable for high-speed operation. 3) Bearing self-aligning performance. When the axis of the shaft does not align with the axis of the bearing housing, resulting in angular errors, 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, and their load-carrying capacity in misaligned states may be lower than that of ball bearings. Therefore, when shaft stiffness and bearing housing support stiffness are low, or when large tilting moments are present, such bearings should be avoided. 4) Bearing installation and removal. When the bearing housing has no split plane and components must be installed and removed axially, bearings with separable inner and outer rings (such as N0000, NA0000, 30000, etc.) should be preferred.

BOSCH REXROTH bearing lubrication methods

Lubrication is crucial for bearings. Lubricants in bearings not only reduce friction but also dissipate heat, reduce contact stress, absorb vibrations, 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 (d is the bearing inner diameter, mm; n is the bearing speed, r/min) is used to indicate the bearing speed. The figure shows the dn value limits for grease lubrication and oil lubrication.

BOSCH REXROTH bearing installation methods

Before starting the assembly of rolling bearings, the rolling bearings must first be cleaned to keep them clean and tidy; then the rolling bearings should be inspected and assembled according to their assembly requirements. 1) First, remove any 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, wiping them dry with a cloth. 4) Remember, do not use dirty oil, dirty cloths, or cotton waste to clean or dry the bearings. Principles of rolling bearing assembly: Depending on the bearing structure, size, operating 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, thermal expansion assembly, and power frequency induction heaters. 1) Rolling bearings should not be removed from components unless necessary; if removal is required, correct tools and methods should be used. 2) Before assembling rolling bearings, appropriate cleaning agents and methods should be selected based on the anti-rust method of the rolling bearings to ensure they are clean. 3) Before assembly, use internal and external micrometers to check the inner diameter of the bearing ring and the diameter of the shaft journal; the fit tolerance must comply with 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 the bearing 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, scraping with a scraper can 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. 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. During hot mounting, direct heating with flame is strictly prohibited; use hot oil heated to 80~90℃, and the oil temperature should not exceed 100℃. The bearing must not contact the bottom of the heating oil tank; it should be suspended in the middle of the oil layer to avoid local overheating causing annealing. Heating time must not be less than 15min, allowing the inner ring to expand to the required dimension before assembly. Do not pause during the hot mounting process; quickly install the bearing to the correct position in one go. If the steel ball cage inside the bearing is made of oil-sensitive plastic, water heating is preferred, but moisture should be wiped off promptly after assembly. 6) Rolling bearing assembly must meet the following requirements: Inspect cleaned bearings to ensure they are undamaged, rust-free, rotate smoothly without abnormal noise, and verify the fit category and dimensions of the bearing with the shaft journal and bearing housing; proceed with assembly only if requirements are met. 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 bearing inner ring. During assembly, ensure the bearing fits tightly against the shaft shoulder; the gap between tapered roller bearings and 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, adjusting the clearance 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 binding, then add an appropriate amount of grease. Sealing devices must be assembled according to regulations, ensuring no oil leakage after sealing. For single-row, double-row, and four-row tapered roller bearings and radial thrust bearings, axial clearance must 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 lubricant filling 65%~80% of the cavity volume; for bearings using thin oil lubrication, do not inject grease. When assembling bearings, the adjusted axial clearance and axial preload (axial pre-interference) must comply with bearing standards or equipment technical document specifications.

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