>> P.185
2-177호칭번호와사양의세부사항정밀도외통외경은스냅링의장력에의해변형되므로식(1)로측정점을산출하여그점의평균직경치를사용합니다.W=4+L1/8..............................................................................................(1)여기서W:단면에서측정점P까지의거리mm(그림1참조)L1:외통의길이mmL1WP스냅링그림1표2내접원경및외통외경의허용차단위μm내접원경Fw또는외통외경D의호칭치수mm내접원경Fw의치수차외통외경Dm(1)의치수차을(를)초과이하상하상하46+18+10──610+22+130-81018+27+160-81830+33+200-93050+41+250-115080+49+300-1380120+58+360-15120150──0-18주(1)Dm은외통외경의2점측정으로얻어진최대직경과최소직경의산술평균치입니다.속도의허용치ST시리즈는회전및왕복직선운동이가능하지만각각의운동을동시에수행할때의속도허용치는식(2)에서구하며,일반적인값이표4에나와있습니다.DN≧Dpwn+10Sn1.............................................................................(2)여기서DN:속도의허용치(표4참조)n:회전속도min-1n1:분당왕복횟수min-1S:스트로크길이mmDpw:볼세트피치경mm(Dpw≒1.15Fw)Fw:내접원경mm단,n1≦5000,Sn1≦50000일때적용할수있습니다.표4속도의허용치윤활조건DN오일윤활600000그리스윤활300000표1ST시리즈의형식과크기형상밀봉씰형식크기4568101216202530354045505560708090100개방형ST○○○○○○○○○○○○○○○○○○○○밀봉형ST…UU---○○○○○○○○○○○○○○○○○개방형ST…B---○○○○○○○○○○○○○○○○○밀봉형ST…UUB---------○○○○○○○○○○○범용중(重)하중용표3외통길이의허용차단위μm내접원경Fw의호칭치수mm외통길이L1의치수차을(를)초과이하상하─200-20020600-300601000-400
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