DIN_8188相关标准规范

UDC672.64/.65:621.85.055.25:621.855:6201March 1984American type roller chains8188Rollenketten;amerikanische BauartSupersedes August 1972 edition.In keeping with current practice in standards published by the International Organization for Standardization (ISO),a comma has been used throughout as the decimal marker.See Explanatory notes for connection with International Standard ISO 606:1994 published by the InternationalOrganization for Standardization (ISO).Dimensions in mm1 Scope and field of applicationThis standard specifies dimensions and technical delivery conditions for American type roller chains which,together with their associated chain wheels,are predominantly used as power transmission elements between twoor more shafts.2 Dimensions and designationFor illustrations,designations and dimension tables,see pages 2 to 5.3 MaterialPlates shall be made of heat treatable steel or case hardening steel,the grade being at the manufacturer's discre-tion.4 Design and finishRoller chains shall be supplied greased or lubricated (at the manufacturer's discretion).other types of finish beingthe subject of agreement.Attachment plates shall be cranked or straight,at the manufacturer's discretion.Bushes and/or rollers shall be wound or seamless,at the manufacturer's discretion.When a measuring force equal to 1%of the minimum breaking force is applied to an unlubricated chain,desig-nated by a chain number up to and including 12 A,of at least 610 mm in length and to a chain,designated by achain number from 16 A to 48 A,of at least 1220 mm in length,the actual length of the chain shall not deviatefrom the nominal length by more than +0.15%.5 TestingFor length measurement,the chain shall be supported along its entire length.For testing the breaking force,chains with a length equal to at least 5 x p shall be attached by pins through theouter plates or bushes so as to permit universal movement and prevent any bending stress.The results of tests inwhich failure occurs near the shackles shall be disregarded.The proof force shall amount to 1/3 of the minimumbreaking force.6 Technical delivery conditionsChains that are ordered in metres always terminate with an inner link at either end and may be supplied withoutconnecting links.Chains that are ordered on the basis of a given number of links may be supplied either with or without aconnecting link.If a roller chain without connecting link is to be supplied on the basis of a given number of links,it shall be stated whether the chain is to terminate with an inner link or an outer link.Where a chain is to be supplied ready for assembly with a connecting link,the type of link desired shall be statedin the order.This link is included in the total number of links ordered.Where type C or L cranked links are used (not recommended),the ratio of test force to minimum breaking forcemay be reduced by 20 %Continued on pages 2 to 6.303