EXTERNAL SPUR GEAR DATA（外圆柱齿轮参数）
manufacturing data（制造参数）
part number（零件号）
tooth form（齿面）
gear type（齿轮类型）
number of teeth（齿数）
normal module（法向模数）
normal pressure angle (at ref circle)法向压力角（在分度圆上）
helix angle (at ref circle)螺旋角（在分度圆上）
helical lead（螺旋导程）
hand of helix（旋向）
reference face width（参考齿宽）
outside diameter（齿顶圆直径）
chamfer diameter（倒圆直径）
reference(pitch)circle diameter（分度圆直径）或节圆
start of active profile diameter有效渐开线起始圆直径
form diameter 展成直径
root diameter齿根圆直径
base circle diameter基圆直径
whole depth全齿高
normal circular tooth thickness (at reference circle)法向弧齿厚（在分度圆上）
root type齿根形式
root fillet radius 齿根圆角半径
lead crown齿向鼓形
HOB DATA滚刀参数
pressure angle压力角
profile的中文意思tooth thickness at reference line分圆齿厚
protuberance凸角
tip radius齿顶圆半径
reference part number 零件号
INSPECTION DATA检验数据
profile tolerance and modifications齿形公差和修形
profile hollow齿形中凹
refernce pitch circle runout节圆跳动
pitch variation齿距偏差
lead variation齿向偏差
lead hollow齿向中凹
profile surface finish渐开线齿面精加工
ball diameter量球直径
dimension over two balls in same plane跨棒距
REFERENCE DATA-MATING GEAR对啮齿的参考参数
normal center distance 中心距
mating gear part number对啮齿轮零件号
mumber of teeth on mating gear对啮轮齿数
backlash (nominal CD ,ROOM TEMP)侧隙(法线方向，室温)
general notes(通用技术要求)
1.DO not scale drawing(不要在图上量取尺寸)
2.all surfaces corners and edges must be free from burrs
        and sharp edges-break 0.075 MM MAX(所有面,角和边不能有毛刺,锐边倒钝不超过0.075mm)
3.unless otherwise stated(除非特别注明,否则)
    A.all dimensions and tolerance are in millimeters per
                    Chinese standard(所有以毫米为单位的尺寸和公差均按中国标准)
    B.all surface finishes to be 3.2 micrometer or better(所有表面粗糙度不应低于3.2)
    C.all dimension are finished dimensions;no allowance has been
          made for any change in maximum or least material condition
          due to heat treatment(所有尺寸均为最终尺寸;热处理导致的最大或最小实体条件的变化不应超出允差)
    D linear dimensions to be +/- 0.25 MM(线性尺寸偏差为+/- 0.25 MM)
    E angular dimensions to be +/- 0.5º(角度尺寸偏差为+/- 0.5º)
4.mark part number as shown(如图作零件号)
5.mark serial number as shown(如图作系列号)
6.heat treatment to be applied to all surfaces(整体热处理)
gear notes(齿轮技术要求)
1.do not grind roots and fillets after heat treatment(热处理后不得磨及齿根和圆角)
2.no steps or grooves permissible in root and fillet region after
    honing or grinding(珩磨后,齿根和圆角区域不允许有台阶或凹痕)
3.profile tolerance based upon floating band fit(齿形误差应以公差带为计)
4.gear must be free from grind burns and tempering(齿面不得烧伤)
5.pitch line runout and other tooth tolerances are with respect to
        datum A(节圆跳动和其它齿轮公差均以基准A为测量基准)
6.profile tolerance to be measured between form and chamfer(齿形误差应由渐开线起始(或终止)圆测量至齿顶倒角)
7.min hardness must be achieved in tooth root and fillet region(齿根和圆角处的硬度不得低于硬度下差)
8.root radius tangent to profile not to extend above form diameter(齿根圆角要与齿面相切,而且不能超过渐开线起始(或终止)圆直径。
9.do not thru harden tooth tips(齿尖不得淬透)

齿轮基本术语
齿轮    Toothed gear；Gear   
齿面    Tooth flank   
长幅内摆线    Prolate hypocycloid
齿轮副    Gear pair   
右侧齿面    Right flank   
短幅内摆线    Curtate hypocycloid
平行轴齿轮副    Gear pair with parallel axes   
左侧齿面    Left flank   
渐开线    Involute；Involute to a circle
相交轴齿轮副    Gear pair with intersecting axes   
同侧齿面    Corresponding flank   
延伸渐开线    Prolate involute
齿轮系    Train of gears   
异侧齿面    Opposite flank   
缩短渐开线    Curtate involute
行星齿轮系    Planetary gear train   
工作齿面    Working flank   
球面渐开线    Spherical involute
齿轮传动    Gear drive；Gear transmission   
非工作齿面    Non-working flank   
渐开螺旋面    Involute helicoid
配对齿轮    Mating gears   
相啮齿面    Mating flank   
阿基米德螺旋面    Screw helicoid
小齿轮    Pinion   
共轭齿面    Conjugate flank   
球面渐开螺旋面    Spherical involute helicoid
大齿轮    Wheel；Gear   
可用齿面    Usable flank