Screwing Bearing

Characteristics: Screwing support bearing arrangement is applied in the occasion where traditional bearing design structure cannot greatly meet the applications. The product range of ZEITLOS thrust angular contact ball bearing is wide; therefore, it can meet the requirement on bearing arrangement of ball screw drive during high dynamic operating condition, such as high precision, heavy bearing capability, high rigidity, low friction, simple and convenient installation, no maintenance or less maintenance. Specific solutions can be achieved via these products with full consideration and ideal application to meet the requirements on technicality and economy of bearing arrangement in ball screw drive.

Single row and multiple row design: Thrust angular contact ball bearing is designed to single row, double row and triple row, and all they are install-and-play units. They are separable bearings, which are composed of outer ring with steady geometric dimension and thick wall, ball, retainer component and one or two inner ring. In several series, there is through-hole on the flange of outer ring, and it can also be installed on adjacent structure. The inner and outer rings of these bearings can be matched with each other; therefore, the pre-tightening of bearing shall be set in advance when the bearing ring is locked by precise locking nut.

Radial and axial bearing capacity: Due to 60°contact angle, the bearing cannot only bear radial force but also high axial force.

Operating temperature: Limited by lubricating grease, sealing materials and the nylon retainer in ball and retainer components, the sealed thrust angular contact ball bearing is suitable for the environment where the temperature is from -30°C to +120°C.

█ Operating temperature will affect dynamic performance of bearings.

█ The value in size specification sheet

Retainer: Nylon retainer is adopted in thrust angular contact ball bearing. This kind of retainer design is not indicated in suffix. In 7602, 7603 and BSB series, nylon retainer is expressed by TVP or T.

Suffix: Suffix of existing design: please refer to the table below.

Suffix	Description	Design
PE	Bearing design with low requirements on tolerance	Standard design
T, TVP	Nylon retainer, guided by ball
2AP	Thrust angular contact ball bearing, in pair (ZKLN and ZKLF)
2RS	Contact sealing at both ends
2Z	Gap sealing at both ends

Lubrication: Screwing support bearing can be lubricated by lubricating grease or oil. However, for machine tool, the average temperature of bearing shall not exceed +50°C. In case of such condition, lubricating method without heat dissipation can be chosen, such as grease lubrication or pulse oil supply. For higher bearing temperature or no sealed bearing, circulation oil lubricating mode can be adopted.

Grease lubrication: ZKLN, ZKLF, ZKLFA and DKLFA series of bearings with re-lubricating device adopt lithium soap base grease in accordance with GA28 for lubrication under appropriate grease lubrication. Under most conditions, first filling of lubricating grease can meet long-life use of bearing. Under some application conditions, re-lubrication is necessary. Initial lubricating grease is compatible with mineral substance oil - based lubricant. If the lifetime of lubricating grease or lubrication interval is to be calculated, please contact us.

Re-lubrication interval: Re-lubrication interval cannot be accurately determined in advance. They will be greatly affected by operating conditions and environment factors such as temperature, pollution, dust and water, etc.

In case of the following conditions, the bearings must be re-lubricated usually:

█ Before and after long time storage

█ In environment with high humidity

█ Indicate lubrication interval in technical proposal instruction.

In case of the following conditions, please contact us:

█ The bearing is static

█ Vibration exists

█ Slight pendulum motion exists.

Lubrication dose for re-lubrication bearing: If ZKLN, ZKLF, ZKLFA and DKLFA series of bearings must be re-lubricated due to application conditions, please contact us to determine the lubrication dose for re-lubrication.

Oil lubrication: Other lubrication methods are also available, such as pulse oil supply lubrication or circulation oil lubrication. For oil lubrication, good lubrication effect will be achieved if CLP lubrication oil in accordance with DIN51517 and HLP lubrication oil in accordance with ISO-VG32 to ISO-VG100 in DIN51524 are adopted. The pulse oil supply lubrication is to be adopted by ZKLN and ZKLF series of bearings, the clearance gap sealing has advantage.

Installation guide: During installation, installation force can only be applied on the bearing ring to be installed. It is forbidden to apply installation force to rolling element or seal ring. Only when the bearing is adopted with ZEITLOS precise locking nut and the tightening torque given in the size specification sheet is adopted, its advantages can be reflected. Thrust angular contact ball bearing is inseparable and the bearing parts cooperate with each other. During installation and disassembling, the inner ring cannot be separated from the bearing. If single part of the bearing is separated from the bearing, please contact us before reassembling.

During installation, thrust angular contact ball bearing ZKLN, 7602, 7603 and BSB must be installed in the bearing pedestal and on the axial without clearance, and they must be pre-tensioned in advanced. To avoid transformation of rollaway nest, the axial pretightening force must be evenly distributed on the circle of ferrule. The pretightening force will be applied to bearing ring via ring nut with the maximum run-out tolerance of 5μm, therefore, compared with bearing end cover position adopted, it shall be used in precedence.