花键
spline
Splined
splines
impeller and shaft
integral key
multiple keys
flower key
multiple spline
Multiple key
multiple spline keys
spline=the multiple keys
梯形
trapezoid
trapezium
Trapezoidal
Trapezia
echelon
ladder
Buttress
Step
wave
lugsail
Acme
Scalariform
trapeze
Tie
erect traperzium
en echelon
Acme[screw
内花键
internal spline
female spline
外花键
male spline
External spline
Free dividing
花键驱动
splined drive
spline drive
矩形花键
parallel spline
Rectangle spline
花键连接
splined joint
spline joint