齿轮的定义:
轮缘上有齿能连续啮合传递运动和动力的机械元件。
齿轮是能互相啮合的有齿的机械零件,齿轮在传动中的应用很早就出现了。19世纪末,展成切
齿法
的原理及利用此原理切齿的专用机床与刀具的相继出现,随着生产的发展,齿轮运转的平稳性受
到重视。
齿轮的制造材料和热处理过程对齿轮的承载能力和尺寸重量有很大的影响。20世纪50年代前,齿轮多用碳钢,60年代改用合金钢,而70年代多用表面硬化钢。按硬度,齿面可区分为软齿面和硬齿面两种。
软齿面的齿轮承载能力较低,但制造比较容易,跑合性好,多用于传动尺寸和重量无严格限制,以及小量生产的一般机械中。因为配对的齿轮中,小轮负担较重,因此为使大小齿轮工作寿命大致相等,小轮齿面硬度一般要比大轮的高。
硬齿面齿轮的承载能力高,它是在齿轮精切之后,再进行淬火、表面淬火或渗碳淬火处理,以提高硬度。但在热处理中,齿轮不可避免地会产生变形,因此在热处理之后须进行磨削、研磨或精切,以消除因变形产生的误差,提高齿轮的精度。
制造齿轮常用的钢有调质钢、淬火钢、渗碳淬火钢和渗氮钢。铸钢的强度比锻钢稍低,常用于尺寸较大的齿轮;灰铸铁的机械性能较差,可用于轻载的开式齿轮传动中;球墨铸铁可部分地代替钢制造齿轮;塑料齿轮多用于轻载和要求噪声低的地方,与其配对的齿轮一般用导热性好的钢齿轮。
MSGA1-24
MSGA1.5-20
MSGB2-18
MSGB2.5-18
MSGB3-18
MSGB4-18
MSGB1-24
MSGB1.5-20
MSGA2-20
MSGA2.5-20
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MSGB3-20
MSGB4-20
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MSGB2.5-24
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SRCp5-100
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MMSB1-20R
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MMSA1.5-20R
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MMSA8-20R
MMSB1.5-20R
MMSB2.5-20R
MMSB3.5-20R
MMSB5-20R
MMSA8-20L