Modeling method for cylindrical gear of straight tooth or helical tooth
A technology of helical spur gears and standard involutes is applied in the modeling field of standard involute spur gears or helical spur gears, and can solve the problems of complicated and cumbersome work and cannot be applied to spur gears with cycloidal spurs or helical gears. Modeling, difficult to grasp, etc.
Inactive Publication Date: 2013-04-17
SHANGHAI NORMAL UNIVERSITY
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Problems solved by technology
To carry out computer-aided design, a three-dimensional geometric model of the gear is first required. At present, the common modeling methods of spur gears or helical gears are mainly completed by using existing large-scale commercial software or secondary development of large-scale commercial software. This modeling method requires cumbersome mathematical calculations, and each modeling can only build a model for a single specific type of gear, and cannot be used for the construction of other types of spur gears or helical spur gears. For example, the method of building a model of an involute spur or helical spur gear cannot be applied to the modeling of a cycloid spur or helical spur gear
In addition, every modeling of a different type of spur gear or helical gear requires specific three-dimensional modeling according to actual specific requirements, which requires the designer to have high professional knowledge in gear and software , the work is complex and cumbersome, not easy to master
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no. 1 example 1
[0042] The first embodiment of the present invention is a modeling method of a standard involute spur gear, which includes the following steps:
[0043] (1) Create the parametric sketch module of the tooth profile curve, and select the following parametric equations to complete the drawing of the closed sketch of the gear tooth:
[0044]
[0045]
[0046] z=u+lcosγ
[0047] in,
[0048]
[0049] cosγ=tanβcosα,
[0050] cos λ = cos α sin γ ,
[0051]
[0052] u = r tan β θ ,
[0053]
[0054] Take α=λ=20°, β=θ=0, γ=π / 2, Simplified to:
[0055]
[0056]
[0057] z=u
[0058] x- the abscissa of a point on the tooth surface; y- the ordinate of a point on the tooth surface;
[0059] z- the axial c...
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The invention provides a modeling method for a cylindrical gear of a straight tooth or helical tooth, comprising the following steps: (1) using a computer to create a tooth profile curve parameterization sketch module and finishing a sealing sketch and a dedendum circle sketch of a gear tooth; (2) creating an entity of the gear tooth in a component environment; (3) creating an entity of a dedendum circle cylinder in the component environment; (4) taking the entity of the dedendum circle cylinder as an entity of a reference annular array gear tooth; and (5) combining the entity of the gear tooth with the entity of the dedendum circuit cylinder, and finishing to obtain an integrated simulation entity of a virtual three-dimensional gear. The common modeling method for the cylindrical gear ofthe straight tooth or helical tooth provided by the invention is simple and easy to learn, is suitable for modeling three-dimensional entity models for the various cylindrical gears of the different straight teeth or helical teeth.
Description
technical field [0001] The invention relates to a modeling method of transmission parts, in particular to a modeling method for standard involute straight or helical cylindrical gears by utilizing the powerful secondary development function of computer drawing software. Background technique [0002] Spur gears with straight teeth or helical teeth are one of the most basic parts used to transmit parallel axis motion and power in the mechanical field, and are widely used in various mechanical equipment such as mining, metallurgy, construction and transportation. With the rapid development of computer technology, the design and manufacture of gears is developing towards the direction of computer-aided design, manufacture, analysis and measurement. To carry out computer-aided design, a three-dimensional geometric model of the gear is first required. At present, the common modeling methods of spur gears or helical gears are mainly completed by using existing large-scale commercia...
Claims
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IPC IPC(8): G06F17/50
Inventor 林菁
Owner SHANGHAI NORMAL UNIVERSITY