I am trying to specify a "keystone" taper on a cylindrical spline, i.e. to have the male and female splines be cylindrical in cross-section, but to have the tooth thickness on the male, and space width on the female, increase linearly along the axis. The application is a female selector which slides on an input shaft and can mate with male teeth on either a high- or low-speed gear. The "keystone" profile keeps the selector in positive engagement with the spline on the gear and prevents it from creeping or jumping out of engagement. I have seen pictorial representations in textbooks such as Nunney's "Light and Heavy Vehicle Technology". However, I am wondering is there a specification for this kind of spline or at least for the rate of taper? We have used crowned splines in the past but not this.
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