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What is a skeleton oil seal

 

The skeleton oil seal is relatively simple, and generally consists of three parts: the oil seal body, the reinforcing skeleton and the self-tightening coil spring. The sealing body is divided into bottom, waist, cutting edge and sealing lip according to different parts.

The skeleton is like the steel bar in the concrete component, which plays a role in strengthening and enabling the oil seal to maintain its shape and tension. Generally, the inner diameter of the skeleton oil seal in the free state is smaller than the shaft diameter, that is, it has a certain "interference". Therefore, when the oil is encapsulated into the oil seal seat and the shaft, the pressure of the oil seal edge and the contraction force of the self-tightening coil spring produce a certain radial tension on the shaft, and after a period of operation, the pressure will quickly decrease or even disappear, therefore, the plus spring can compensate the oil seal self-tightening force at any time.

 

National standard for skeleton oil seals

GB/T 9877.1-1988 Rotary shaft lip seal structure size series Part I: Inner package skeleton rotary shaft lip seal

GB/T 9877.2-1988 Rotary shaft lip seal structure size series Part II: Exposed skeleton rotary shaft lip seal

GB/T 9877.3-1988 Rotary shaft lip seal structure size series Part III: Assembled rotary shaft lip seal

GBT 9877-2008 Hydraulic transmission rotary shaft lip seal design specification

GBT 14273-1993 Test Method for Performance of Rotary Shaft Lip Sealing Rings

GBT 16593-1996 Rotating shaft lip seal term

GB 13871-92 Rotary shaft lip seal basic dimensions and tolerances

GB/T 9877−2008 Code for the design of lip seals for hydraulic transmission rotary shafts

GB/T 13871.4-2007 Lip sealing rings for rotating shafts with sealing elements made of elastomer material – Part 4: Performance test procedures

GB/T 13871.3-2008 Lip sealing ring for rotating shaft with sealing element of elastomer material – Part 3: Storage, handling and installation

GB/T 13871.1-2007 Lip seals for rotating shafts made of elastomer material – Part 1: Basic dimensions and tolerances

 GB 15326-1994 Appearance quality of lip sealing ring for rotating shaft

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