文档库

最新最全的文档下载
当前位置:文档库 > 英语大作业

英语大作业

机械专业英语随堂考试试卷

CHAIN DRIVES

Chain drives occupy a unique position in the mechanical field.In a sense,they ar e similar to belt drives;a chain connects sprockets on the driving and driven shafts.The velocity ratio transmitted from one shaft to the other depends on the size of the two s prockets(at the pitch line);unlike that found with belts,the ratio is positive.In belt drive ,creep and slip play important roles and must be considered;in a chain drive,which is made up of numerous links,there is a small amount of play in the total length of the ch ain.This may be desirable in case of small overloads.A chain drive is similar to the op en-belt type of dirve in that the driving and driven shafts rotate in the same direction.

There are also similarities between chain drives and gear drives.Both types tra nsmit a positive velocity ratio.In a regular spur-gear drive,the driving and driven shaft s turn in opposite directions unless an idler is employed.In gear drives employing an a nnular or ring gear,however,the input and output shafts rotate in the same direction.In a spur-gear drive there is very little contact between meshing gears;therefore,tooth loa ds are excessive.Since the connection between a chain and its sprocket extends over s everal teeth,no one tooth is subjected to heavy loads.

Chain drives are often noisy.The silent chain type of drive was developed to cou nteract this undesirable characteristic.Belt,chain,and gear drives are all dangerous.Belt and chain speeds are high,as is the pitch-line velocity of most gear drives.All should be adequately covered by suitable guards(or completely enclosed) so that no boby or c lothing parts can possibly be caught in the moving components.

Other comparisons can be made among chain,belt,and gear drives.Gear drives ca n operate at higher speeds than the others,and are usually more compact.However,chai n drives do not require the mounting precision that is so essential for gearing.An adva ntage of chain drives in comparison to belt drives is that the former do not require tens ion on the slack side;this leads to better bearing life.In general,chain drives are more c ompact than the belt type;for a given ratio,the sprockets can be smaller than belt pulle ys.For a given load,chain widths are narrower than comparable flat belts.The connecti ng link on chain drives makes them easy to install—the chain is merely placed over th e sprockets and the proper pins are placed in position.In most belt installations,force is needed to place the belt in the proper position;such action is detrimental to mounting bearings.The angle of contact for the driving sprocket can be smaller than the driving pulley for a belt drive.For a chain drive,this angle can be as small as 120 degrees.The center distance can also be small;if a 120-degree angle of contact is provided,the cente r distance need be no more than just enough to provide clearance for the sprocket teet h.

An essential part of any chain drive is the sprocket.A chain drive requires a sproc ket on the driving shaft and another on the driven shaft.Chain drives sometimes conta in additional sprockets,used for additional power take-offs or for taking up chain slack .When used to take up chain slack,they are known as idlers.Idlers should be mounted on the slack side,not on the tight side.It is desirable to have an adjustment for idler pos

英语大作业

(共2页)