SAE花键标准简介(doc 5页)

SAE花键标准简介(doc 5页)_New

Lead Variation is the variation of the direction of the spline tooth from its intended direction parallel to the reference axis, also including parallelism and alignment variations (see Fig. 1a). Note: Straight (nonhelical) splines have an infinite lead.

导向公差：导向公差是花键的键齿的实际齿线与花键的参考轴线之间的平行度公差，这个公差包括平行度公差和圆周阵列公差（见图Fig.1a）。注意：直齿花键（非螺旋花键）的导向公差为无穷大。

译者注：这一条解释有待斟酌。

Length of Engagement (L

q

) is the axial length of contact between mating splines.

结合长度（L

q

）：结合长度是两个相互配合的内、外花键之间的接触段的长度。

Machining Tolerance (m) is the permissible variation in actual space width or actual tooth thickness.

加工公差（m）：加工公差是花键的实际齿槽宽和实际齿厚的允许的变动量。

译者注：在《GB/T 3478.1-1995 圆柱直齿渐开线花键》中，将加工公差定义为T。

Major Circle is the circle formed by the outermost surface of the spline. It is the outside circle (tooth tip circle) of the external spline or the root circle of the internal spline.

大圆：大圆是花键的最大齿形面的包络圆。它是外花键的外圆（齿顶圆），和内花键的齿根圆。

Major Diameter (D

o , D

ri

) is the diameter of the major circle.

大圆直径：大圆直径（D

o , D

ri

）是大圆所在圆的直径。

译者注：在《GB/T 3478.1-1995 圆柱直齿渐开线花键》中，将大圆直径定义为：

内花键D

ei 、外花键D

ee

。

Minor Circle is the circle formed by the innermost surface of the spline. It is the root circle of the external spline or the inside circle (tooth tip circle) of the internal spline.

小圆：小圆是花键的最小齿形面的排斥圆。它是外花键的齿根圆，和内花键的内圆（齿顶圆）。

Minor Diameter (D

re , D

i

) is the diameter of the minor circle.

小圆直径：小圆直径（D

re , D

i

）是小圆所在圆的直径。

译者注：在《GB/T 3478.1-1995 圆柱直齿渐开线花键》中，将小圆直径定义为：

内花键D

ii 、外花键D

ie

。

Nominal Clearance is the actual space width of an internal spline minus the actual tooth thickness of the mating external spline. It does not define the fit between mating members, because of the effect of variations.

理论侧隙：理论侧隙是内花键的实际齿槽宽减去与之相互配合的外花键的实际齿厚所得的值。由于内、外花键在配合时会产生一定的公差，所以理论侧隙不能够用于确定相互配合的内、外花键之间的间隙。

Out of Roundness is the variation of the spline from a true circular configuration.

圆度：圆度是花键与真圆的圆廓之间的公差。

Parallelism Variation is the variation of parallelism of a single spline tooth with respect to any other single spline tooth (see Fig. 1b).

平行度公差：平行度公差是单根键齿相对其它的单根键齿之间的平行度公差。（见图Fig.1b）

Pitch (P/P

s

) is a combination number of a one-to-two ratio indicating the spline proportions; the upper or first number is the diametral pitch, the lower or second number is the stub pitch and denotes, as that fractional part of an inch, the basic radial length of engagement, both above and below the pitch circle.

径节分数（P/P

s

）：径节分数是由两个数组成的一个比率，它表示的是花键的比例；设这个比率为A/B（这个分数用英寸表示），则在这个分数中第一个数（分子）A表示的是花键的径节，第二个数（分母）B表示的是残余径节，径节表示的是在节圆上方的键齿在半径方向上的结合长度，残余径节表示的是在节圆下方的键齿在半径方向上的结合长度。

译者注：可以理解为节圆将整个花键键齿一分为二，节圆上方的键齿的齿高为径节，节圆下方的键齿的齿高为残余径节。在实际计算时要考虑到渐开线终止圆与修缘线所在圆对键齿有效结合齿高的影响，并将其扣除。

Pitch Circle is the reference circle from which all transverse spline tooth dimensions are constructed.