Precautions for Simmerring Oil Seal Installation

Simmerring oil seal is relatively simple and generally consists of three parts: oil seal body, reinforced skeleton and self-tightening coil spring. The seal body is further divided into bottom, waist, edge and sealing lip according to different parts. The skeleton plays the role of reinforcement and enables the oil seal to keep good shape and tension. Usually, the internal diameter of the skeleton oil seal in the free state is smaller than the shaft diameter, i.e. it has a certain amount of "interference". Therefore, after the oil seal is installed into the oil seal seat and shaft, the pressure of the oil seal edge and the contraction force of the self-tightening coil spring produce a certain radial tightening force on the shaft, and after a period of operation, the pressure will rapidly decrease or even disappear, thus, the spring can compensate the self-tightening force of the oil seal at any time.

Cautions.

 1、From oil seal pick-up to assembly, it must be kept clean.

 2、Don't tear off the wrapping paper too early before the installation of skeleton oil seal to prevent debris from attaching to the surface of the oil seal and bringing into the work.

3、Before installation, the skeleton oil seal should be coated with lithium ester with molybdenum disulfide in appropriate amount between the lips to prevent the shaft from causing dry grinding phenomenon to the lips when starting instantly and affecting the overfilling amount of the lips, and should be assembled as soon as possible. The oil seal seat with oil seal installed, if it is not installed immediately, it is recommended to cover it with cloth to prevent foreign matter from attaching to the oil seal. The hand or tool for applying lithium grease must be clean.

 4、The skeleton oil seal should be installed flat, no tilting phenomenon. It is recommended to use oil pressure equipment or sleeve tool to install. The pressure should not be too big, and the speed should be even and slow.

5、Before assembly, do a good inspection of oil seal, measure whether the size of each part of the skeleton oil seal matches with the size of the shaft and cavity, before the skeleton oil seal is installed, the size of the shaft diameter and the inner diameter size of the oil seal are checked clearly and should match. The size of the cavity should match with the width of the outer diameter of the oil seal. Check whether the lip of the skeleton oil seal is damaged or deformed, and whether the spring is off or rusted. Prevent the oil seal from being put flat during transportation and being affected by external force such as extrusion and impact, and destroy its true roundness.

6、Make a good machining inspection procedure before assembly, measure whether the size of cavity and shaft parts are correct, especially the inner chamfer, there can't be slope, the end face of shaft and cavity should be processed smoothly, there is no damage and burr in the chamfer, clean the assembly parts, there can't be burr, sand, iron chips and other debris in the loading place (chamfer) part of the shaft, which will produce irregular damage to the lip of oil seal, it is recommended to use r angle in the chamfering part.

7、In the operation technique, you can feel it by hand, whether it is smooth and really round.