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1.Abstract: This paper designs a measuring instrument wh ich can measure addendum circle and dedendum circle diameter of odd_tooth gear s and can define all main parameters of gears.
3.As an example, we take Z_2=60, Z_d=1- 5 and h_a~* = 0.8, 0.7, 0.6, and caculate the theoretical and the designed minimum working pressure angles respectively, the corresponding modification coefficients can thus be obtained.
4.This paper using a principle of three point defining one circle designs a measuring instrument which can measure addendum circle and dedendum circle diameter of gears (odd or even tooth number)and can define all main parameters of gears Features of this measuring instrumeat are usage being simple and conveninet, accuracy being middle, cost being low and poputarile and use being convenient
5.Accordingly,the least teeth number without undercutting is also decided only by the design pressure angle of the gear,without any relation to the coefficient of addendum height of the gear.
6.Finally,these changes lead to the bald degree of ears reduced,the grain number and weight per ear increased,and grain output per mu raised.
7.The results were shown as follows: "Tianda-2116" could accelerate its jointing and heading, raise its drought resistance in the flowering stage, increase plant height, ear-position height, number of kernels per ear and thousand kernel weight, and reduce the bald rate.
8.This paper deals with measuring the diameter of addendum circle for a involute spur cylindrical gear and calculating and determining its mode number and pressure angle.
9.The influence of different tip pruning times on yield and fiber quality was studied with the island cotton Xinhai16.The results indicted that the different tip pruning times affect apparently the space distribution of boll, only effective knot bell number changes to submit only summit curve,but does not play a role in only boll weight and lint percent;
10.Pillow Top: Provides a traditional layer of surface comfort. Often looks like a pillow, expertly tailored to prevent crowning, and the enhanced edge support virtually eliminates the sensation of roll-off.
