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The AutocCAD program generates the involute gear wheel corridor curve to open the Inventor part template. After setting the options as described above, click OK and Inventor will start importing the graphic file. In the message bar, you can see this information in turn: open the file D: gear.dwg processing entity exceeds 316 (from 1 to 316) improve the constraint ready. When the message bar is ready, you can see the gear sketch outline; You can't see the imported graphics in the current window. You can select the sketch in the browser, click the right mouse button, and click Find in the window to see the outline of the gear sketch. After editing the sketch, you will enter the solid modeling phase. First select the tensile feature, set the tooth width to stretch, and obtain the involute spur gear; then make the keyway, the hub and other structures to complete the solid shape of the spur gear, as shown.
Other Involute Gear Modeling Techniques The shape of the involute helical gear is the shape of the involute helical gear and the shape of the spur gear. The main difference is the shape of the helical gear helix. The modeling process is as follows: (1) Create and edit sketches. Import the gear contour pattern in the sketch environment (this step is the same as the spur gear, so I won't go into details). The end sketch of the spur gear solid shape drawing, three parallel working planes are respectively established according to the tooth width, and the working plane 1 is respectively placed on the gear contour graph on the plane 2 and the plane 3 respectively according to the spiral angle in AutoCAD. After rotating the gear outline graphic, the sketch editing state is exited.
(2) Gear lofting modeling. Click the Stakeout command button, select the closed gear profile section in the grass, grass, and grass, and select some corresponding point mappings on the teeth in each sketch in the extended options. After confirming, you can get the desired helical gear. Then, the structure of the hub 1 of the gear is made, and the shape of the helical gear is completed. The helical gears made by this method with m = 5 mm, z = 2, A = 2b, B = 8b2., are as shown.
Helical gear solid shape. 2 Straight-tooth bevel gears The shape of the straight-toothed bevel gears is very different from that of the first two types of gears. The same is true for the contours of the gears. The modeling process is as follows: (1) Create and edit sketches. The closed contour pattern of one tooth of the gear is introduced, and the sketch is ended. Make a work plane orthogonal to the sketch and pass it through the axis of symmetry of the closed tooth; create a new sketch on the working plane, make a horizontal line from the point of the circular arc of the closed tooth, and the length is a bevel gear Tooth width, end sketch editing.
(2) Tooth shape lofting. Click the sweep command button, select the closed tooth profile as the cross-sectional profile, take the straight segment as the path, sweep the bevel angle as the tooth root angle of the bevel gear, add the way to sweep, complete the shape of one tooth; in the working plane Create a sketch, make a straight line from the center of the gear contour, and make it a cone angle with the horizontal angle. End the sketch and set this line as the working axis.
(3) The annular array outputs all the teeth. Click the ring array command icon, select the made tooth as the array feature, set the working axis as the rotation axis, and place the number of teeth in the size of the bevel gear z, the angle is (36bz), click OK to array All the teeth are selected; the plane where the root circle of the tooth is selected is the working plane, and the root circle of the gear is used as the root circle of the gear, and the sketch editing state is exited, the sketch is stretched, the extension angle is set as the root cone angle, and the teeth of the bevel gear are obtained. The root cone; the structure of the gear hub and the like is completed to complete the shape of the bevel gear. A straight bevel gear of m = 5 mm, z = 21, A = 2b, D = 14b made by this method, as shown.