In order to draw the involute, we need strings tangent to the base circle. the elements (lines, circles, points, curves) should be green. Keep in mind that your sketch should always be fully constraint. The smaller the angle is, the better the spline curvature will be.įor gear with greater diameters and modules, you may need more than 5 lines to create an involute that project above the outside diameter. The angle value is independent to the number of teeth and the circle diameters. Using constraint tool, create angle dimensions between each line => 10deg. The first should be vertical and they should all be coincident with the base circle diameter. Using Circles tool, draw 2 circles coincident with the point reference systemĪnd modify both diameters to the pitch and base circles diameter valuesĪnd draw 5 lines as follow. In Sketch tools toolbar, deselect “Snap to point” option ???? CATIA -Ĭlick File/New/Part, rename it “Gearset 1 – Pinion”, Deselect “Enable hybrid design” and Click Ok ??? = ? cos ϕ, where ϕ is the gearset pressure angle - ? = ??, where ? represents the number of teeth and ? is called the module and define the tooth size.Īpplication I want to draw a gearset with the following properties: ? - Velocity ratio: ?? = ?????? ????? = ?? ?? = ?. The gear tooth must project both below and above the rolling-cylinder surface (pitch circle), and the involute only exists outside of the base circle. The cylinders from which the strings are unwrapped are called the base circles (??? ) and are smaller than the pitch circles (?), which are the diameters of the original rolling cylinders. The involute of a circle is a curve that can be generated by unwrapping a taut string from a cylinder. The cycloid is still used as tooth form in some watches and clocks, but most gears use the involute of a circle for their shape. There is an infinite number of possible conjugate pairs that could be used, but only a few curves have seen practical application as gear teeth. In order for the fundamental law of gearing to be true (“the angular velocity ratio between the gears of a gearset must remain constant throughout the mesh”), the gear tooth contours on mating teeth must be conjugates of one another. We are famous as helical gear manufacturer in India.RMIT University - Thierry Perret-Ellena – mail: Clients are highly satisfied by our produces. We provide helical gears at cost-efficient prices. We are authentic producers of helical gears on a wide scale. We high quality helical gears to various parts of the country as well as countries spread across the globe. Helical gears are made with robust construction and offers stable performance throughout their life span. Helical gears boost the productivity of the machinery they are installed. Helical gears are easy to install, operate and maintain. Quality oriented helical gears are the result of stringent supervisions maintained during construction. We have equipped modern machineries and equipment for the auto-up gradation of the products manufactured. We never compromise in the product quality clients are highly satisfied by our products. We have specifically designed helical gear to suitably fit the industrial framework they are installed in. Helical gears are flexible in nature and are suitable for heavy duty workloads. Helical gears are utilized in transmission gears. They are cylindrical gears where the teeth’s are curved into helix shape. Helical gears are highly appreciated due to their heavy resistibility to workload. We provide helical gears in various shapes, sizes and texture as per the valuable demands of consumer. Helical gears are assembled with top-grade raw materials. We are expertise in offering quality oriented helical gears for various industrial purposes. We are leading manufacturer, supplier and exporter of fine grade helical gear in India.