Design a set of planetary gear sets according to the design requirements, and complete the 2D parts drawing and assembly drawing conforming to GB through AutoCAD2007. The common feature of the two-dimensional CAD system is that the drawing is convenient and accurate, and the method is simple, but it is difficult to express the complex object structure, and the necessary physical analysis and assembly interference check cannot be performed.
Through the SolidWorks, the mechanism is three-dimensionally modeled to generate intuitive three-dimensional graphics, and each sub-assembly is completed, and the cross-section is rotated to observe whether each component interferes from different angles. When modeling a part, first understand the design intent, determine the modeling order, and then design the overall structure of the part as needed, and then refine it.
The following is an illustration of the design method for creating a model by modeling an example of a planet in a SolidWorks environment (see Figure 1).
(1) Determining the part structure The part consists of a rotating body, a star wheel shaft hole, a spline, and a uniform screw hole.
(2) Create a sketch Select the front reference plane as the sketch plane, use the curve command in the sketch to draw the shape of the body section; add the geometry and size constraints to complete the sketch (see Figure 2). Changing the constraints in the sketch will change the shape of the model.
This fully demonstrates the advantages of using the sketch function to create a model that is easy to edit and modify, and to achieve parameterization and serialization.
(3) Generate a sketch of the revolving body exiting completion, select the rotating boss base feature, and select the center line as the rotation axis to generate the revolving body.
(4) Creating a star wheel shaft hole First create a hole with the cut and stretch feature, and then the ring array generates three uniformly holes.
(5) The spline is generated by cutting the scanning feature into a spline groove, and then the circular array generates a spline.
(6) Creating a screw hole uniformly distributed along the circumference First, a screw hole is created by the profiled hole guide feature, and then the circular array generates 12 uniformly distributed screw holes.
After the modeling of each part is completed, the overall assembly is performed. The planetary gear set is assembled from the bottom up. First create a new assembly file, and then assemble according to the overall order structure of each part unit body to complete the assembly (see Figure 3). In assembly, assembly constraints should be correct and complete, but constraints should be defined, and all constraints must be valid to prevent unconstrained conditions from occurring. A cross-section of the assembled planetary gear set (see Figure 4) is used to observe the internal assembly and inspection with an interference check tool. Parametric improvement is made to the place of interference, and then re-modeled to check the interference.
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