作业帮英语翻译CAMS ( I ) Various motions can be produced by the action
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英语翻译
CAMS ( I ) Various motions can be produced by the action of a cam against a follower .Many timing devices are operated by cam action .The purpose of any cam is to produce a displacement of its follower ; a secondary follower is often used to produce additional displacement in another location .The most popular type is the plate cam .The cylindrical type is used to usef to transmit linear motion to a follower as the cam rotates .Three-dimensional cams are sometimes used ; these provide some unusual follower motions ,but also make follower design difficult .The camshaft in the automotive engine illustrates a simple but important application of a plate cam .The cam assemblies in automatic record players illustrate a somewhat more complex application .Cam profiles are accurately constructed by either graphical or mathematical methods .The transition from development drawings to working (shop) drawings can be made in several ways :Make a full-scale template .This is desirable from the manufacturing standpoint ,but it will not guarantee accurate cam Profiles .Use radial dimensions .This is fairly accurate ,but sometimes produces layout problems in the shop .Use coordinate dimensioning .This procedure will ensure accuracy .In selecting one of these methods ,one should consider the function of the cam in terms of desired preciseness .Types of Cams Plate cams are simple to fabticate .Fig.5-1 shows a tangential plate cam ,which is often used to open and close valves at the correct time .The follower can be moced in various patterns with various rise/fall rations .Motions should be controlled to avoid abrupt changes in force transmitted from the cam to the follower .One should carefully determine horizontal froce components ,since these present problems desigining the follower assembly guide .Critical reactions occur at point A and B .These reaction values must be computed .The relative vertical position of point A with respect to B needs to be raised if the reaction value at B is excessive .The position of B should be as closed to cam as possible to minimize flexure in the roller-follower support .
CAMS ( I ) Various motions can be produced by the action of a cam against a follower .Many timing devices are operated by cam action .The purpose of any cam is to produce a displacement of its follower ; a secondary follower is often used to produce additional displacement in another location .The most popular type is the plate cam .The cylindrical type is used to usef to transmit linear motion to a follower as the cam rotates .Three-dimensional cams are sometimes used ; these provide some unusual follower motions ,but also make follower design difficult .The camshaft in the automotive engine illustrates a simple but important application of a plate cam .The cam assemblies in automatic record players illustrate a somewhat more complex application .Cam profiles are accurately constructed by either graphical or mathematical methods .The transition from development drawings to working (shop) drawings can be made in several ways :Make a full-scale template .This is desirable from the manufacturing standpoint ,but it will not guarantee accurate cam Profiles .Use radial dimensions .This is fairly accurate ,but sometimes produces layout problems in the shop .Use coordinate dimensioning .This procedure will ensure accuracy .In selecting one of these methods ,one should consider the function of the cam in terms of desired preciseness .Types of Cams Plate cams are simple to fabticate .Fig.5-1 shows a tangential plate cam ,which is often used to open and close valves at the correct time .The follower can be moced in various patterns with various rise/fall rations .Motions should be controlled to avoid abrupt changes in force transmitted from the cam to the follower .One should carefully determine horizontal froce components ,since these present problems desigining the follower assembly guide .Critical reactions occur at point A and B .These reaction values must be computed .The relative vertical position of point A with respect to B needs to be raised if the reaction value at B is excessive .The position of B should be as closed to cam as possible to minimize flexure in the roller-follower support .
(我)不同的凸轮运动可以由一个凸轮的作用对一个追随者.许多计时装置,由凸轮的行动.任何凸轮的目的是制造一个置换的追随者;第二个追随者,常被用来制作附加位移在另一个位置.最受欢迎的类型是板块凸轮.筒形类型用于usef传送到一个追随者直线运动的凸轮旋转.三维视角有时也用;这些提供一些不同寻常的佛
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