Gears are transmission parts that are widely used in machines or components. To ensure the needs of various transmissions, the profile of the gear teeth can be made into involute, cycloid or arc. The direction of the teeth is straight, helical, herringbone or curved. In practice, I have created a basic parametric model of the standard gears (including straight teeth, helical teeth, and herringbone teeth) with a common tooth profile curve as involute, which is convenient for users to call. Sub-assembly design is intended because gears are common parts, only the modulus and pressure angle are standardized, and in the sub-assembly, due to the different components of the mating parts, different process requirements, etc. In addition, the shape of other parts varies greatly. Therefore, in the creation of the library, only the standard parametric model of the gear tooth portion is established, and other partial structure shapes are created by the user on the basis of the basic model.
The part design intention is to analyze the dimensional relationship between the geometric elements and geometric elements of the gear, and determine which parameters are directly driven by the final model to determine the design intent of the part. The feature design intent feature is a basic unit that can be driven by parameters. The design process of the part is the accumulation process of the feature. By changing the size parameters related to the feature, the size and shape of the model can be changed to realize the size drive model. The creation of features begins with drawing a sketch of a sketch that combines dimensions, constraints, and a reference element to form a section that contains the geometric parameters of the model, the topological relationships of the shapes, and the geometric parameters and graphical structural parameters. Relationship between.
By analyzing the characteristics of standard parts and common parts, the geometric parameters and structural parameters of the figure are extracted and the relationship between them is established. This is an important guarantee for constructing the parameterized model. The standard parts library has a single fully-associated database, and its two-dimensional engineering drawing is obtained by the three-dimensional model through the orthographic projection method. In order to ensure that the two-dimensional engineering drawing meets the requirements of China's relevant drawing standards, the bearing cage part structure is not considered, and other The threaded part of the standard part is not modeled according to the actual structure, but the decorative part (01.2-/) is used to indicate the thread part structure to ensure the correctness of the two-dimensional engineering drawing. Because it is a standard part, such a modeling process does not affect the practical application of the library. The establishment of the standard parts library is mainly done by using the family table development tool.
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