Visual design of cycloidal pinion planetary reducer
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Visual design of digital design cycloidal pinwheel planetary reducer bookmark0â–¡Chongqing University Mechanical Engineering College Houyi Songchao Province as a new generation of ordinary reducer, cycloidal pinion planetary reducer with its input and output coaxial, multi-tooth mesh The novel structure is widely used in driving devices and speed reducing devices in industrial sectors such as petroleum, chemical, textile, military, engineering machinery, metallurgy and mining. However, because of its structural design, kinematics, and dynamics analysis, the cycloidal pinwheel speed reduction mechanism is the most complicated and difficult to control of all gear reducers, so its design and use is far less than that of involute gears. The speed reducer is as popular. After research, the author developed a simple and convenient visual design scheme for the cycloidal planetary reducer, hoping to inspire the designers.
The cycloidal pinwheel reducer consists of a center wheel (pin wheel), a boom input shaft (eccentric wheel), a cycloidal wheel and a pin-pin type W mechanism output shaft.
The cycloidal wheel is a disc structure with evenly distributed holes. Its biggest feature is the cycloidal contour, and its three-dimensional modeling difficulty lies in the drawing of the cycloidal contour. Since SolidWorks 2004 is not directly used to draw the cycloid, it is necessary to generate a cycloidal profile for the parametric design by means of a corresponding program to generate a desired cycloid profile. The cycloid contour rectangular coordinate parameter equation is as follows: punctuation, as shown, then use the spline curve command to connect all coordinate points to obtain the cycloidal profile curve, and then perform stretching, array and resection operations to obtain the cycloid Wheel as shown.
In this paper, using Sod's 3D modeling Works2004 software as a platform, the method of realizing the profile of the cycloidal wheel is studied. The visual design, virtual simulation assembly and finite element analysis of the cycloidal pinwheel reducer are completed, and the cycloidal pinwheel reducer is improved. The speed and quality of the design.
The system's 3D CAD software, using the advanced Parasolid graphics language platform kernel, has achieved great success in terms of software usability and efficiency. SolidWorks is powerful enough to perform product design work in 3D environments and is widely used in parts design, assembly design, sheet metal design and mold design. In addition, SolidWorks also provides a tool for communication and interaction. The actual tooth profile equation of the zp cycloidal wheel is integrated by means of a plug-in: a data is calculated at intervals of 0.5*, and the entire cycloidal wheel has a total of 721 point coordinates.
Using the drawing method to obtain a series of sitting on the pendulum 3. The box and the pin-toothed case are irregularly shaped geometric shapes with complex shapes and many different parts, which can be rotated, stretched, and cut by SolidWorks software. get. It should be noted here that a reasonable modeling sequence is important, and modeling should be based on data.
The pin housing can be obtained by turning and cutting. The three-dimensional modeling of other parts is not repeated here. The finished box and pin housing are as shown.
Second, the virtual simulation assembly of the cycloidal pinwheel reducer The virtual simulation assembly of the three-dimensional parts of the cycloidal pinwheel reducer should first be assembled with the bearing, the pin and the pin bushing, the pin gear and the pin gear sleeve. After the sub-assembly is completed, the total assembly is carried out. According to the order from the inside to the outside, the input shaft is assembled first, then the two cycloidal wheels and the pin are assembled, then the pin pin and the pin housing are assembled, and finally the accessories are assembled to obtain the complete Reducer assembly. The assembly sequence in the assembly process is very important. It should be noted here that whether the assembly sequence is reasonable will directly affect the quality of the assembly. The virtual assembly of the cycloidal pinwheel reducer is shown.
On the virtual assembly model, an assembly interference check is performed to determine if there is physical interference between the parts in the assembly and where the interference occurs, thereby eliminating interference. For assemblies with more parts or more stringent assembly requirements, an assembly inspection should be performed after assembling one part, so that errors can be found in time and corrected in time.
Third, the finite element analysis of the cycloidal wheel According to the meshing principle of the cycloidal pinion planetary transmission, the pin wheel and the cycloidal wheel are multi-toothed. The distribution of the load between the cycloidal wheel and each pin and the pin sleeve and the pin hole in the W mechanism is complicated. In addition to the influence of contact deformation, it is also affected by manufacturing errors, meshing clearance and deformation of the cycloidal wheel body. Impact. It is difficult to determine the force of the cycloidal wheel using traditional calculation methods. COSMOSWorks is an analysis module fully integrated into SolidWorks software that provides a complete analysis. With advanced fast finite element analysis, it provides fast and accurate analysis and verification of large-scale complex designs and the necessary information to correct and optimize designs.
In this paper, the COSMOSWorks plug-in is used to perform finite element analysis on the cycloidal wheel. The sequence of operations is as follows: load and constraint application to the cycloidal wheel, as shown in Figure 5; automatic division of the cycloidal grid, such as force distribution, as shown.
Using 3D CAD software SolidWorks software for visual product design, you can observe the internal structure and appearance of the cycloidal pinwheel reducer, so that the unreasonable structure can be improved at the product design stage, such as the cycloidal pinwheel reducer. Assembly and detachability, as well as assembly efficiency analysis. In the experimental phase of the product, the application of visual product design can reduce the need for physical prototypes, measurement and assembly performance analysis, and give hints on interference during motion, as well as the ability to analyze the force of the cycloid reducer parts. , deformation and modality, etc. In summary, the model built by SolidWorks software is an assemblyable and movable model.é’
