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GB/T 896-2020 (GB/T896-2020)

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GB/T 896-2020: PDF in English (GBT 896-2020)
GB/T 896-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.30
J 13
Replacing GB/T 896-1986
“E” Rings
开口挡圈
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: OCTOBER 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Codes ... 5 
4 Dimensions and Design Parameters ... 6 
5 Carrying Capacity ... 10 
6 Limit Speed ... 11 
7 Groove Design ... 11 
8 Technical Conditions ... 11 
9 Marking ... 12 
Foreword
GB/T 896 is one of the “circlips” series of national standards. This series of standards
include:
---GB/T 893 Retaining Rings for Bores;
---GB/T 894 Circlips for Shaft;
---GB/T 896 “E” Rings;
---GB/T 959.1 Specifications for Retaining Rings - Circlips.
This Standard was drafted in accordance with the rules in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 896-1986 “E” Rings. In comparison
with GB/T 896-1986, apart from editorial modifications, the main technical changes are
as follows:
---The tolerances of the thickness of “E” rings are modified (see Table 1; Table 1
of Version 1986);
---The outer diameter d3 of “E” rings after assembly is added (see Table 1);
---The outer diameter D in the free state is deleted (see Table 1 of Version 1986);
---The range of the nominal diameter d2 of “E” rings is modified (see Chapter 1
and Table 1; Chapter 1 and Table 1 of Version 1986);
---The range of shaft diameter for the specifications of “E” rings is modified (see
Table 1; Table 1 of Version 1986);
---The inner diameter and its tolerances of “E” rings are modified (see Table 1;
Table 1 of Version 1986);
---The standard value of groove carrying capacity FN is added (see Table 1);
---The standard values of “E” rings carrying capacity FS and FSg are added (see
Table 1);
---The requirements for flatness are added (see Chapter 8);
---The limit speed of “E” rings is added (see Table 1);
---Appendix A is deleted (see Appendix A of Version 1986).
This Standard was proposed by China Machinery Industry Federation.
“E” Rings
1 Scope
This Standard specifies the codes, types and dimensions, carrying capacity, limit
speed, groove design, technical conditions and markings of “E” rings with a nominal
diameter of d2 = 0.8 mm ~ 30 mm (hereinafter referred to as “E” rings).
This Standard is applicable to “E” rings for fixing components (parts) on the shaft.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 959.1 Specifications for Retaining Rings - Circlips
GB/T 1237 Designation System for Fasteners
3 Codes
The following codes are applicable to this document.
a radial width of “E” ring opening in the natural state
d1 shaft diameter
d2 nominal diameter = groove diameter
d3 outer diameter of “E” ring installed in the groove
d4 inner diameter of “E” ring
FN groove carrying capacity with material’s lower yield strength ReL = 200 MPa
FS carrying capacity of “E” ring in contact with right angle
FSg carrying capacity of “E” ring in contact with chamfer
g part’s chamfer size
m groove width
5 Carrying Capacity
5.1 General Rules
The installation dimensions of “E” ring requires respective calculation of the groove’s
carrying capacity FN and “E” ring’s carrying capacity FS. Generally speaking, the lower
limit parameter is mainly taken as a reference in the design. The carrying capacities
(FN, FS, FSg) provided in Table 1 do not include the safety factor of the yield generated
under static load or the fatigue fracture under dynamic load. Under static load, the
safety factor of resistance to fracture is at least 2 times.
5.2 Groove’s Carrying Capacity FN
The FN values provided in Table 1 are applicable to the groove with the material’s lower
yield strength ReL = 200 MPa, a given edge distance of n and a shaft diameter of d1.
When the material’s lower yield strength ReL deviates from 200 MPa, the carrying
capacity FN is proportional to the yield strength. The groove’s carrying capacity shall
be calculated in accordance with Formula (1):
When the shaft diameter d1 deviates from d1, the groove’s carrying capacity FN shall
be calculated in accordance with Formula (2):
5.3 “E” Ring’s Carrying Capacity FS
The FS values provided in Table 1 are applicable to the assembly where the “E” ring is
in contact with the part at right angles (see Figure 3).
The FSg values provided in Table 1 are applicable to the assembly where the “E” ring
is in contact with the part with a chamfer size of g (see Figure 4).
FS values and FSg values are applicable to the “E” rings with a material elasticity
modulus of 210 GPa.
For a different chamfer size g, the “E” ring’s carrying capacity FSg shall be calculated
in accordance with Formula (3):
......
 
(Above excerpt was released on 2021-05-22, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT896-2020