The torque converter leaves can be divided into two categories: developablesurface leaves and leaves an exhibition surface.
液力变矩器的叶片可以分为两类：可展曲面叶片和不可展曲面叶片。
2
Inflatable membrane reflector is usually non-developablesurface, made by a number of plain membranes splicing and paste into the overall membrane surface.
充气膜结构反射面通常是不可展曲面，需要由多个平面膜片拼接并粘贴成整体曲面。
3
A method of modifying the double enveloping worm gearing with developable tooth surface has been proposed to reduce the sensibility of the worm gearing to the manufacturing errors.