I, R2=LR 4, Nhu v~y mQt cau can bang la cau co:
Bang 2.2: 1\19t s6 chuoi ca Call
Ki hi~u
o o o
o - -
Moi quan h~ ham
({J2 =/( hill" Ilqc. ({J/)
T2 =/(Iu'nh hqc. T/)
+- Xl =j(xl , /,.I}> a)
-+
2.4.1.4. Truyen d~ng: cam
Cam la chi tiet co th~ quay tron hO~le dao d¢ng 10k de: truyen ehuyen dQng qua l:;ti (tjoh tien hai ehieu) ho~e ehuyto dQog hk cho chi tiet thu 2- chi tiet b\ dan, hlnh 2.31. Khi cam quay, chi tiet bi dan dUQ'e nang lCn, ngu-ng l<;ti va t\!t xuong vdi khOllng thai giao wcmg ling ph\! thuQe vao cau hioh ella cam. Phan I¢ch tam - ban kinh l(m eua cam nang chi tiet bi dan lCn va phao I¢ch tam ban kinh nho h~ chi tiet xuang voi thai gian tuy thuQc vao hlnh dang cam. Vung cam gilC chi
tiCt bi di'm ti,li mQt muc khong d6i trong m¢t thai gian dang ke gQi la khoang ngu-ng. Vung nay cua cam thuang e6
ban kinh khong d6i (wang ling voi 'I 6 :/
khoang thai gian ngirng).
bl 0 A , 0 ) 'I V , I.)
llinh 2.31' Ballh cam vii chi liet h! d/ill
~ ~l ,_. c ~l ,_. c ~ ~ ,~ 'w ~ '. ~ E 0 • ," o , > .. ffi~ '" ' ~ 0 , • '. ,", ~' Vcing quay cam
~!r-,
' - - -! !
W ,~ "= -
Hlnh dang cua cam dllQ'C yeu du de sinh ra ehuyen dQng dinh trucK eua chi tiet bi dan. Hinh dang cam nhu hlnh 2.32a, mQt cam tron nhung co tam quay l¢ch. cho phcp chi tiet bi dan co chuyen dQng dao dQog dieu hoa, lo~i thuang dtIQ'c sir dy.ng trong ket cau eua bdm. Cam d hlnh 2.32b. co hlnh d<;tng tnii lim, khi quay cho phep chi tiet bi dan djch chuyen len voi toe dO co dinh trong mQt khOllng thai gian,
Hinh 2.32: M(II s6' hinl! dall)!, cam vd