机械设计第七章带传动BELT DRIVES第七章带传动第一节概述INTRODUCTION大理石切割机(Marble Cutter)(125Kw)FLAT-BELT DRIVE手扶拖拉机(Walking Tractor)V-BELT DRIVE桑塔纳轿车(Santana)发动机SYNCHRONOUS-BELT DRIVE一、Working ?带传动是一种在生产中被广泛应用的机械传动方式,它通常连接在原动机与工作机或减速器之间,一般作减速运动。?带传动的组成:主动轮(1)、从动轮(2)、传动带(3)?工作原理:由于传动带是以一定的张紧力紧套在带轮上,使得在带与带轮的接触面上产生分布正压力(Normal Force),当主动轮转动时,依靠带与带轮间的摩擦力(Friction)使传动带及从动轮转动,以传递运动和动力。带传动的特点(Characteristics)?由于带传动是通过中间挠性件(Flexible Element)(传动带),依靠带与带轮间的摩擦力工作的,所以带传动具有以下特点:?Advantages?DisadvantagesAdvantages?Small amount of installation work?Small amount of maintenance?High reliability?Good adaptability to the individual application?In some cases, shock- and sound-absorbing?In some cases, with continuously variable speed (variable-speed belt drive)Disadvantages?Limited power transmission capacity?Limited transmission ratio?In some cases, synchronous power transmission impossible (Creep)?In some cases, large axle and contact forces requiredTypes of belt driveOpen Belt DriveQuarter-Twist Belt DriveCrossed Belt Drive?Base on the shafts arrangement and rotating direction:
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