GB/T 290-2017Rolling bearings—Needle roller bearings with drawn cup and without inner ring—Boundary dimensions (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

This Standard replaced GB/T 290-1998 Rolling Bearings - Needle Roller Bearings, Drawn Cup without Inner Rings - Boundary Dimensions; compared with GB/T 290-1998, this Standard had the major technical changes as follows besides the editorial modifications.

--- Modify the standard name;

--- Add "Normative References" Clause, "Terms and Definitions" Clause, "Structure Type" Clause, and "Code" Clause (see Clause 2, Clause 3, Clause 5 and Clause 6);

--- Add the symbol and code for the end thickness C2 of flat-bottom punched outer ring (see Clause 4 and Table 1~Table 8);

--- Add two structure types and their boundary dimensions; namely, a sealed type of needle roller bearing with drawn cup and without inner ring of which one side has the seal ring; and open type of full-complement needle roller bearings with drawn cup and without inner ring (oil-fat limit) (see Figure 4, Figure 6 and Table 2~Table 5);

--- Add the models and boundary dimensions for 71D, 22D, 32D serial needle roller bearings with drawn cup and without inner ring - boundary dimensions.

1 Scope

This Standard specifies the boundary dimension for the needle roller bearings with drawn cup and without inner ring (hereinafter referred to as needle roller bearings).

This Standard is applicable to the design and type-selection of bearings.

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 272 Rolling Bearings - Identification Code

GB/T 6930 Rolling Bearings - Vocabulary

GB/T 7811 Rolling Bearings - Symbols for Quantities

3 Terms and Definitions

The terms and definitions stipulated in GB/T 6930 are applicable to this document.

4 Symbols

The following symbols and those stipulated in GB/T 7811 are applicable to this document.

Unless otherwise is specified, the symbols shown in Figure 1~ Figure 9 and the values shown in Table 1 ~ Table 8 are all nominal dimensions.

C. width of punched outer ring

C1. thickness of end on the forming bottom of the sealed type of punched outer ring […]