GB/T 896-2020“E” rings (English PDF)

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).

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

5.3 "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 FSg' shall be calculated in accordance with Formula (3):