Ken-ichi Mitome

Tooth Surface Measurement of Conical Involute Gears by CNC Gear-Measuring Machine

Developed is a new tooth surface measurement of conical involute gears by CNC gear-measuring machines. Advances in the design and production of conical involute gears and its wide applications are demanding the measurement of the conical involute gears using CNC gear measuring machines. Therefore, a new concept called an equivalent helical gear is introduced. Thus, a conical involute gear can be measured as a helical involute gear. Experiments demonstrate that this new method gives accurate results and has practical value. Finally tooth surface analysis of a conical involute gears is also presented.

Profile Shifted Conical Involute Gear With Deep Tooth Depth

This paper proposes a new design method for profile shifted conical gear with deep tooth depth. This method has two new concepts. First, this method is based on the designed pitch point where the rack shift coefficient is not zero. Second, this method is based on the theory of nonintersecting bevel gear such as hypoid gear, to decide the mounting dimensions of the profile shifted conical involute gears with deep tooth depth. The profile shifted conical involute gears have the designed pitch point that is not the standard pitch point. Limits of the rack shift coefficient and the facewidth, for the undercut and the zero top land, are clarified. Next, the production system is shown, and several typical test gears are manufactured. Paths of contact between tooth surfaces of profile shifted conical gears are obtained by tooth bearing tests. As a result, the measured value of limits of the rack shift coefficient and the facewidth on the manufactured tested gears are in good agreement with the theoretical ones. Moreover, test results of tooth bearing are in good agreement with the theoretical ones.Copyright

Design and Production System of a Pair of Nonintersecting-Nonparallel Axis Concave Conical Gears

Conical involute gears used for marine transmission are mostly helical conical involute gears. Besides these gears are not intersecting axis gears but also nonintersecting-nonparallel axis gears. In this case, the contact between tooth surfaces of a pair of gears is point contact. Hence the tooth surface durability is generally small. In order to overcome this weak point, one of the authors invented a new type of conical gear, which is called “Concave conical gear”. The authors are aimed at the establishment of the design and production system of the Concave conical gears for marine transmissions. In this paper, an allowable normal load of a pair of nonintersecting-nonparallel axis concave conical gear is obtained, and a new designing method for these gears is presented. Tooth bearing tests prove that the Heltzian contact ellipse is larger than that of the conventional conical involute gear. Thus it is proved that this designing method is of practical use.

Conical Involute Gear: Development, Applications, and View for Tomorrow

The design and production system of the conical involute gear has been developed. This system is composed of gear cutting method, gear grinding method, over-ball measurement for control of finishing dimensions, tooth surface measurement, tooth surface analysis, tooth action and normal allowable load between two mating gears, and the design of a pair of gears. As a result, conical involute gears came to be used in a wide range of applications. This paper presents the research and development for more than 25 years, many applications, and a new possibility for tomorrow.Copyright

Development of Over-ball Measurment of Straight Involute Pinion-Type Cutter.

An over-ball measurement of a straight involute pinion-type cutter is newly developed. This method makes it possible to control the finished size of the pinion-type cutter by measuring over-ball distance in grinding. In this method, the pinion-type cutter is regarded as a conical involute gear. First the over-ball distance is obtained analytically. Next it is verified by experiments. Experimental results agree well with analytical data. In addition, how to apply this measurement to control of the infeed distance in practical grinding is presented. The final infeed distance of the grinding wheel is determined when the difference between the analytical and experimental over-ball distances is obtained. As a result, it is proven that this over-ball measurement is of practical application.