1、Shim rings and supporting rings DIN 988 Pascheiben und Sttzscheiben Supersedes May 1971 edition In keeping with current practice in standards published by the International Organization for Standardization (/SO), a comma has been used throughout as the decimal marker. Dimensions in mm 1 Scope and fi
2、eld of application Shim rings are designed to prevent machine components from moving axially. The preferred application of these rings is to sompensate for the play of such components where secured by circlips as specified in DIN471 and DIN472, DIN 983 and DIN 9840r lock washers as specified in DIN
3、6799. Shim rings may only be used where the contact faces are smooth. They shall lot suffer any deformation when used with components that have rounded edges (shaft collars, stepped holes). Supporting rings are intended for use with circlips or lock washers to ensure that do not deform when subjecte
4、d to excessive 3xial forces as may be expected where the edges of machine components are rounded or chamfered. Supporting rings may be used in combination with shim rings Shim ring Supporting ring The illustration applies by analogy for rings used in bores. It should be noted that where shim rings a
5、nd/or supporting rings are used as part of rolling bearings, there may be the risk of the rings scraping against projecting parts of the cage, or the inner or outer bearing ring. 2 Dimensions and designation r+Q(szirio,-i 2.1 Shim rings Designation of a shim ring with inside diameter, d, = 40mm, out
6、side diameter, d2,= 50 mm, and thickness, h = 0,5 mm: Shim ring DIN 988 - 40 x 50 x 0,5 Continued on pages 2 to 6 Beuth Verlag GmbH. Berlin. has the exclusive right of sale for German Standards (DIN-Normen) DIN 988 Eng/ Price group Sales No 0106 o2 91 COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V
7、.- EnglishLicensed by Information Handling ServicesPage2 DIN 988 Il IIIIII I IlIIII! -tttttll I I I II I I/ I *w o COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesDIN 988 Page3 rn Y C .- vi c .- K 3 O O O W P n E 7 L 0 Y v) Co r.- o) - 2 .- 2 a, - x
8、 Q 9 8 oc : /$ I -1- III COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage4 DIN 988 140 150 160 170 20 1 140,145 140,545 170 169,455 169,855 33 3.42 150,145 150,545 180 i 79,455 i 79,855 3,5 3,42 214 160.1 45 160,545 190 189.37 i 89.83 3.5 3.42 2
9、27 170.145 170,545 200 199,37 199,83 3,5 3,42 240 - COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesDIN 988 Page 5 3 Technical delivery conditions 3.1 Material Shim ringsshall bemadefrom steelof at leastgradeSt2K50asspecified in DIN 1624, whereasspr
10、ing steel withahardnessof440 to 500 HV 10 as specified in DIN 17 222 shall be used for supporting rings. 3.2 Finish Shim rings shall have a type BK surface appearance as specified in DIN 1624, and be oiled. Supporting rings with a thickness of 1,5 mm or less shall have a type BK surface appearance a
11、s specified in DIN 17222, and be either oiled, or phosphated and oiled (at the manufacturers discretion), as shall be supporting rings of a larger thickness, which, however, shall have ground side faces. 3.3 Camber The cambershall be determined by axially loading the ring, placed between two paralle
12、l platens, with test IoadE c, to becalculated from c = h” - h, shall not exceed the values specified in table 3 or 4. I Table 3. Shim rings I Thickness, h I 0.1 5 h 0,3 0,3 h 0.5 0.5 5 h 13 iesr T( 0,025 0,025 50 N 0,075 Table 4. Supporting rings I I l ximum COPYRIGHT DIN DEUTSCHES Institut Fur Norm
13、ung E.V.- EnglishLicensed by Information Handling ServicesPage6 DIN988 Standards referred to DIN 71 DIN 472 DIN 983 Spring retaining rings with lugs for shafts DIN 984 DIN 1624 DIN 6799 Lock washers (retaining washers) for shafts DIN 17 222 Circlips (retaining rings) for shafts; normal type and heav
14、y type Circlips (retaining rings) for bores; normal type and heavy type Spring retaining rings with lugs for use in bores (internal circlips) Steel flat products; cold reduced mild unalloyed steel strip in widths not exceeding 650 mm; technical delivery conditions Cold rolled steel strip for springs
15、: technical delivery conditions Previous editions DIN 988: 08.50, 05.71. Amendments The following amendments have been made to the May 1971 edition. a) The scope of the standard has been extended to include an inside diameter, di, of 170 mm and an outside diameter, d2, of 200 mm. b) Limits of size h
16、ave been included. c) A thickness, h, of 0,15mm has been included for shim rings. d) Specifications for the camber of shim rings and supporting rings have been included e) The standard has been editorially revised. International Patent Classification F 16 B 21/10 F 16 B 43/00 F 16 G 35/06 COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling Services
