Precise measurement for helical angle of cylindrical gears
2.
On the condition the trapping characteristics of whole profile meshing helical pump are lucubrated by theory for the first time , and the select range of the helical angle that can eliminate completely the trapping of whole profile meshing helical gear pump is also obtained
3.
3 . the trapping characteristics of ordinary helical gear pump are lucubrated by theory for the first time , the theoretic relation of the gear rotor between the end overlap coefficient and trapping phenomenon is discussed respectively with clearence or without clearcence , and the relation of trapping volume with the rotational angle turn is also discussed . the selective range of the helical angle that can eliminate completely the trapping of helical gear pump is gained , which never appeared in literature before
4.
For cutting the composite lock gear with unequal tooth thickness , a study is made on the design method of gear sharper cutter with nonstandard parameter involute tooth profile and noninvolute tooth profile . the cutter tooth arrangement , the choice of teeth number of the cutter and the basic method of cutter design are discussed ; and a new method of choosing deflection factor by using limited area is presented . and the curve of relationship between rear angle on tooth crest and helical angle on tooth side of the cutter is given so as to give a basis for the gear sharper cutter to choose its parameters . to design nonstandard gear sharper cutter by adopting the method mentioned above will simplify the calculation and will increase the efficiency of design
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