The approximate expansion of the spherical involute is not possible because the spherical involute [1] cannot be flattened, and is replaced by an approximate involute profile. As shown, D=NO1OC is called the pitch angle, and the cone CO1C1 is tangent to the
Bevel Gear. CC1 at the big end circle, the cone CO1C1 is called the back cone, and the involute on the large end is projected onto the back cone, and then the back cone is unfolded to obtain the involute profile with Zv=Z/cosD as the equivalent number of teeth. . It is concluded that the involute on the large end of the large end of the straight bevel gear with the number of teeth Z, the modulus m and the pitch angle D can be obtained by the straight tooth involute profile with the equivalent tooth number ZV and the modulus m as parameters. Approximate representation.
(1) Establish a cone. Click Feature/Create/Solid/Protru-sion/Revolve/Solid/Done, select the sketching plane [2], enter the sketching interface and draw the corresponding conic section, and rotate 360b to form the gear cone.
(2) Cut the keyway and create a rounded corner. Click Feature/Create/Solid/Extrude/Done to select the sketched surface and draw the keyway section. Adjust the material removal direction and click the Finish button. Open the fillet command, hold down the Ctrl key to select the periphery of the cone, set the fillet radius to the appropriate value, and click Finish.
(3) The first tooth is cut with the tensile feature. Select the stretch feature, Fea-ture/Create/Solid/Cut/, to enter the sketching work environment. Draw the tooth profile as the stretch section and click the Finish button to cut the first tooth. Create an inner datum plane that is perpendicular to the TOP datum and tangent to the conical surface. The system automatically selects the reference plane as the drawing plane, the TOP surface as the reference plane, and draws the tooth shape as the tensile section. Click OK to adjust the material removal direction to complete the first tooth cut.
(4) Complete the construction of all the remaining teeth.
a) A geometric relationship of the angle between the two teeth is added by copying the second tooth, and b) the relationship of the number of remaining tooth input arrays of the array.
Through the above steps, the construction of the bevel gear can be completed. Using this method is simpler and easier to accept. For example, the left is a model of a straight-toothed bevel gear made by the above method. The value of the modulus m of the big end is the standard value of 2. In the GB12369-90, the pressure angle a=20. of the big end is selected, the height coefficient of the tip is ha=1, and the head gap coefficient is c=0.2.
The meshing transmission of the bevel gears 3, 2 continuous transmission conditions to ensure a pair of straight bevel gears can achieve continuous transmission, the coincidence degree [3] should also be greater than or equal to 1, the coincidence is the equivalent gear transmission coincidence, available equivalent The parameters of the gear are calculated according to the calculation formula of the
Spur Gear ratio. Such as the meshing drive of the bevel gear.
The articulated bevel gear transmission is used to transmit motion and power between the two intersecting axes. The teeth of the bevel gear have various forms such as straight teeth, helical teeth and curved teeth. Straight-tooth bevel gears are the most widely used because they are relatively simple to design, manufacture, and install.
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