German ETP bearings ETP models ETP prices

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

ETP 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 elements 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, for pure axial loads, thrust bearings are generally selected. For larger axial forces, thrust roller bearings are selected. For smaller axial forces, thrust ball bearings are selected. 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 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 conditions. With 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 align with the axis of the bearing housing, resulting in an angular error, or when the shaft bends or tilts under load, the axes of the bearing's inner and outer rings will misalign. 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-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 disassembly. When the bearing housing has no split plane and components must be installed and disassembled axially, separable inner and outer ring bearings (such as N0000, NA0000, 30000, etc.) should be preferred.

ETP bearing lubrication methods

Lubrication is crucial for bearings. Lubricants in bearings not only reduce frictional resistance 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's speed. The bearing's dn value (d is the bearing inner diameter, mm; n is the bearing speed, r/min) is generally used to indicate the bearing's speed magnitude. The figure shows the dn value limits for grease lubrication and oil lubrication.

ETP bearing installation methods

Before assembling rolling bearings, clean them thoroughly to keep them free of dirt, then inspect them and assemble according to 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) Alternatively, use other cleaning agents to wash the bearings and wipe them dry with a cloth. 4) Never use dirty oil, dirty cloths, or cotton waste to clean or dry the bearings. Principles for assembling rolling bearings: Depending on the bearing structure, size, operating conditions, and the fit characteristics of the bearing components, assembly pressure must be applied directly to the end face of the ring being fitted; transmitting pressure through the rolling elements is prohibited. Common assembly methods for rolling bearings include press-fit assembly, thermal expansion/contraction assembly, and using power-frequency induction heaters. 1) Rolling bearings should not be removed from components unless necessary; if removal is required, use the correct tools and methods. 2) Before assembling rolling bearings, select appropriate cleaning agents and methods based on the bearing's anti-rust treatment to ensure thorough cleaning. 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 installing rolling bearings in split bearing housings, there should be no gap between the mating surfaces of the bearing cap and the housing. However, a certain clearance must be left at the split joints (housing bore parting lines) on both sides of the bearing outer ring and the housing. The side clearance at the split joints can be measured and checked with a feeler gauge. If the clearance is too small or "binding" occurs, scrape with a scraper to increase the clearance, ensuring it complies with the table "Clearance between Rolling Bearings and Split Bearing Housings." 5) Assembly methods for rolling bearings include driving-in, press-fitting, and hot fitting. When using the driving-in method, use a copper rod or sleeve as a force-transmitting 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. For hot fitting, direct heating with an open flame is strictly prohibited; heat in oil at 80~90℃, ensuring the oil temperature does not exceed 100℃. During heating, the bearing must not contact the bottom or sides of the heating tank; suspend it in the middle of the oil layer to prevent local overheating and annealing. Heating time must be no less than 15min, allowing the inner ring to expand to the required dimension before assembly. Do not pause during the hot fitting process; install the bearing quickly and in one continuous motion to the correct position. If the bearing cage is made of oil-sensitive plastic, use water for heating, but promptly dry off moisture after assembly. 6) When assembling rolling bearings, meet the following requirements: Inspect cleaned bearings to ensure they are undamaged, rust-free, rotate flexibly without abnormal noise, and verify that the fit class and dimensions between the bearing, shaft journal, and housing meet requirements before assembly. Apply pressure evenly and perpendicular to the end face during assembly, avoiding unilateral loading. Select the load application point based on the assembly relationship; for example, when mounting a bearing onto a shaft journal, apply pressure to the bearing inner ring. Ensure the bearing sits tightly against the shaft shoulder; the gap between tapered roller bearings or angular contact bearings and the shaft shoulder must not exceed 0.05mm, and for other bearings, it must not exceed 0.1mm. Bearing caps and retaining rings must be flat and sit uniformly tight against the bearing end faces, adjusting the clearance as specified in technical documents. During assembly, orient the side of the bearing marked with specifications outward for easier inspection and replacement. After assembly, manually rotate the bearing to check for binding, then add an appropriate amount of grease. Install sealing devices as prescribed, ensuring no oil leakage after sealing. For single-row, double-row, and four-row tapered roller bearings and angular contact bearings, check axial clearance during assembly and adjust according to bearing standards or technical documents. All radial bearings, needle roller bearings, and spiral roller bearings must rotate flexibly after assembly. For bearings lubricated with grease, fill the bearing cavity with clean grease amounting to 65%~80% of the cavity volume; do not inject grease into bearings designed for thin-oil lubrication. Adjust axial clearance and axial preload (axial interference fit) during assembly in accordance with bearing standards or equipment technical documents.

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