Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules of standardization documents".
This document is Part 1 of GB/T 13871 "Rotary shaft lip seals whose sealing elements are elastomeric materials". GB/T 13871 has published the following parts:
---Part 1:Dimensions and tolerances;
---Part 2:Vocabulary;
---Part 3:Storage, handling and installation;
---Part 4: Performance test procedures;
---Part 5:Identification of defects in appearance.
This document replaces GB/T 13871.1-2007 "sealing elements for elastomeric materials rotary shaft lip seal Part 1: Basic dimensions and tolerances", compared with GB/T 13871.1-2007, in addition to structural adjustments and editorial changes, the main technical changes are as follows:
a) Changed the expression of "range", deleted the basic type and other contents (see Chapter 1, Chapter 1 of the 2007 version);
b) The symbols "h cavity bore depth", "l cavity, shaft chamfer length" and "r cavity bore fillet radius" have been added and the symbol d2 has been deleted; the symbols b, d1 and D have been changed (see Chapter 4). (see chapter 4, chapter 4 of the 2007 edition);
c) Added use of pressure (see 6.1);
d) Added diagram of seal assembly (see Figure 5);
e) Changed "Nominal Size" to "Size Series", added d1 for 450 and 480 (see 6.2, Table 1, Chapter 5, Table 1 of 2007 edition);
f) Added "Tolerance and tolerance of the main lip diameter of the seal" (see 6.3.1, Table 2);
g) Changed the surface roughness of the shaft and increased the surface hardness requirement of the shaft (see 7.3, 6.3 of the 2007 edition);
h) Dimensional identification codes have been changed (see Table 7, Table 6 of the 2007 edition).
This document is modified to adopt ISO 6194-1:2007 "Rotary shaft lip seals with elastomeric materials as sealing elements Part 1: Nominal dimensions and tolerances".
Compared with ISO 6194-1:2007, this document has more adjustments in structure. See Appendix A for a comparison of the structural numbering changes between the two documents.
The main technical differences between this document and ISO 6194-1:2007 and their reasons are as follows:
a) The normative reference GB/T 13871.2 replaced ISO 6194-2 (see Chapter 3), in order to adapt to the technical conditions in China;
b) replaced ISO 5598 (see Chapter 3) with the normative reference GB/T 17446 to adapt to the technical conditions in China;
c) Changed the symbols of "depth of bore in cavity", "diameter of shaft or main lip of seal", "diameter of bore in cavity or outer diameter of seal", and added the symbol l The symbol "length of the chamfer of the cavity or shaft" (see Chapter 4) has been added to suit our technical conditions;
d) The structure of the air side surface of the seal lip (see 5.3) has been added to adapt to our technical conditions;
e) Increased the structure of the rubber part of the inner skeleton seal (see 5.4) to adapt to our technical conditions;
f) Added the structure code of the seal (see 5.5) and deleted the text description in 5.2 of ISO 6194-1:2007 to adapt to the technical conditions in China and improve operability;
g) Changed the use pressure (see 6.1) to meet our technical conditions;
h) Increase the specification of the seal (see Table 1) to adapt to our technical conditions;
i) increased the tolerance of seal interference and diameter (see 6.3.1, Table 2) to adapt to our technical conditions;
j) Changed the outer diameter tolerance of the seal for D>300 outer diameter range (see Table 4), to adapt to our technical conditions;
Please note that some of the contents of this document may be patent related. The issuer of this document does not assume responsibility for identifying patents.
This document is presented by the China Petroleum and Chemical Industry Federation.
This document is submitted by the National Technical Committee for Standardization of Rubber and Rubber Products Sealing Products Sub-Technical Committee (SAC/TC35/SC3)
Categorized.
This document replaces the previous versions of the document issued for:
--- First released in 1992 as GB 13871-1992, first revised in 2007 as GB/T 13871.1-2007;
--- This is the second revision.
Introduction
Rotary shaft lip seals are used to seal liquids (such as lubricating oil) in equipment with relatively low differential pressure. Usually the shaft is rotating and the chamber is stationary, in some cases the shaft is stationary and the chamber is rotating.
This dynamic seal is usually achieved by designing an interference fit between the shaft and the elastomeric sealing element.
Similarly, an interference fit between the outer circle of the rotating shaft lip seal and the diameter of the bore in the cavity can tighten the seal and prevent static leakage.
GB/T 13871 "sealing elements for elastomeric material rotary shaft lip seal" provides for sealing elements for elastomeric material rotary shaft lip seal, to be composed of six parts.
--- Part 1: Dimensions and tolerances. The purpose is for the design and acceptance of the dimensions of rotary shaft lip seals whose sealing elements are made of elastomeric materials.
--- Part 2:Glossary. The purpose is to summarize and define the terms and definitions of rotary shaft lip seals whose sealing element is elastomeric material for ease of understanding and communication.
--- Part 3: Storage, handling and installation. The purpose is to regulate the operation of seals during storage, handling and installation, which must be done with care to avoid damage caused before and during installation affecting the life of the seal.
--- Part 4: Performance test procedures. The purpose is to test the sealing element for the elastomeric material of the rotary shaft lip seal actual use effect.
---Part 5: Identification of cosmetic defects. The purpose is to identify the quality of the appearance, to avoid leakage caused by defects.
---Part 6: Elastomer material specification. The purpose is to select suitable elastomer materials for rotary shaft lip seals under various operating conditions.
1 Scope
This document specifies the symbols, construction type, operating pressure, dimensional series and tolerances, shaft requirements, cavity requirements, and dimensional identification codes for rotary shaft lip seals (hereinafter referred to as seals) whose sealing element is elastomeric material.
This document applies to seals used under low pressure conditions (see 6.1).
2 Normative reference documents
The contents of the following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the referenced documents, only the date of the corresponding version applies to this document; do not note the date of the referenced documents, the latest version (including all the change orders) applies to this document.
GB/T 1031-2009 Product geometry technical specifications (GPS) surface structure profile method surface roughness parameters and their values
GB/T 1800.2-2020 Product geometrical specifications (GPS) Linear dimensional tolerances ISO code system Part 2: Standard metric Difference with code and limit deviation table of holes and shafts (GB/T 1800.2-2020,ISO 286-2:2010,MOD)
GB/T 13871.2 Sealing elements for elastomeric materials for rotary shaft lip seals Part 2: Vocabulary (GB/T 13871.2-2015,ISO 6194-2:2009,MOD)
GB/T 17446 Glossary of fluid transmission systems and components(GB/T 17446-2012,ISO 5598:2008,IDT)
3 Terms and definitions
The terms and definitions defined in GB/T 13871.2 and GB/T 17446 are applicable to this document.
4 Symbols
5 Structure type
5.1 Seal outer circle structure
The outer circle structure of the seal has four common structures as shown in Figure 1.
6 Use of pressure, size series and tolerances
6.1 Use pressure
The seal is usually used under the condition that the air side is atmospheric pressure and the liquid side is higher than atmospheric pressure 0kPa~50kPa. When used under other pressures, the user should consult the seal manufacturer.
6.2 Size series
The diagram of the seal assembly is shown in Figure 5, and the size series are shown in Table 1.
a Air side.
b Liquid side.
6.3 Tolerances
6.3.1 Tolerance of seal interference and diameter
Tolerances of seal interference and diameter are shown in Table 2.
7 Shaft requirements
7.1 Shaft chamfering
The end of the shaft should be provided with chamfering, see Figure 6 and Table 5, and the end of the shaft should be free of burrs, sharp edges or rough machining marks.
Note: See GB/T 13871.3 for the installation tool. When using the installation tool, ensure that the sealing lip is not damaged.
7.2 Shaft Diameter Tolerance
Shaft diameter tolerance should not be greater than h11 in GB/T 1800.2-2020.
7.3 Shaft surface roughness and hardness
7.3.1 Surface roughness
Shaft and seal contact surface should be taken by grinding processing methods (there should be no grinding processing wire), roughness should be in line with
GB/T 1031-2009 in Ra0.2μm ~ Ra0.8μm or Rz0.8μm ~ Rz3.2μm.
If the shaft surface roughness value is not within the limit value given in this document, it should be determined by the user and the seal manufacturer in consultation.
8 Requirements of the cavity
8.1 Dimensions
8.1.1 If the cavity is made of ferrous material, the bore of the mounting cavity shall meet the requirements of 8.2 and 8.3.
8.2 Cavity bore tolerance
The cavity bore tolerance should not be greater than H8 in GB/T 1800.2-2020.
9 Size identification code
Size identification code by the seal structure code (see 5.5), shaft diameter, cavity bore diameter, seal axial width, see Table 7 for examples.
10 Marking Instructions
When complying with this document, it is recommended that seal manufacturers use the following text in test reports, catalogs and sales documents: "The basic dimensions and tolerances of the seal, shaft and mounting cavity are in accordance with GB/T 13871.1 "Rotary shaft lip seals with elastomeric materials as sealing elements
Foreword
Introduction
1 Scope
2 Normative reference documents
3 Terms and definitions
4 Symbols
5 Structure type
6 Use of pressure, size series and tolerances
7 Shaft requirements
8 Requirements of the cavity
9 Size identification code
10 Marking Instructions
