Hypocycloid gear design software

I am trying to draw a hypocycloid curve for a small engineering project and i cant quite seem to get the equations to work within inventor. Performance and scaling analysis of a hypocycloid wiseman. The cycloidal gear profile is a form of toothed gear used in mechanical clocks, rather than the involute gear form used for most other gears. How to model a hypocycloid drive in blender in a hypocycloid or simply cycloid speed reducer, a flowershaped gear called cycloid disk moves around a stationary ring of round pins in a cycloidal motion, driven by an eccentric bearing or cam connected to the input shaft. Note that with negative value of r g the curve becomes hypocycloid.

A hypocycloid drive is defined by just four easytounderstand parameters. You can design a lobe pump rotor by combining epicycloid and hypocycloid curves. Cyan screws and the white retaining ring round out the design. It creates a cycloidal drive train using mathematically correct cycloid curves. Mechdesigner software makes it easy to add gearpairs that will transmit motion and force naturally through the mechanisms linkages. The main aim of this paper is to develop a new design method in designing new configurations of epicycloid hypocycloid mechanisms.

This shaft spins counter to the base shaft at a highly reduced speed. A hypocycloid curve with four cusps is known as an astroid. Design and customize a spur gear in minutes using emachineshops gear design wizard. Rainer hessmers cycloidal gear builder back to cycloid gear design back to watchmaking back to. Design of cycloids, hypocycloids and epicycloids curves. There are two classic gear arrangements that produce straightline motion the epicycloid and the hypocycloid. If we want to reduce back lash why not design the pins to have bearings on them this should reduce friction as well. The steady counterclockwise rotation of the ring gear is, on the other hand, picked up. Things that the offline gear template generator can do. I am planning to design a high gear ratio around 90 drive with a couple of my students. Contribute to tapnairfusion360hypocycloidgear development by creating an account on github.

Watches and clocks traditionally use cycloidal gearing. Oct 12, 2016 with the help of our tutorial, you can design your own hypocycloid drive in blender in a matter of minutes. The small roller disk is called the generating circle for the gear set. Highratio speed reducer based on cycloidal disk motion. Rainer hessmers cycloidal gear builder back to cycloid gear design back to watchmaking back to back to cycloid gear design. It turns out that if the generating circles diameter is equal to the radius of one of the wheels, the hypocycloid will be a straight radial line on that wheel. In the case of cycloidal gears, the addendum is a curve is an epicycloid. Gear design software mechdesigner software makes it easy to add gearpairs that will transmit motion and force naturally through the mechanisms linkages. The link came courtesy of a thread on cnczone and inspired me to devote a few weekends to creating a hypocycloidal reduction drive also know as a cycloidal speed reducer. Highratio speed reducer based on cycloidal disk motion matlab. With the help of our tutorial, you can design your own hypocycloid drive in blender in a matter of minutes.

You can edit and analyze all of its kinematic properties. Design and fabrication of cycloidal gearbox mechanical. This page will show you how to design these gears and the cutters used to make them. Way back when i cut a lantern and pinion gearset, with 18 pins, that ended up with very pointy teeth that had problems with binding even after a lot of fine sanding. To analyze the performance advantages of the wiseman mechanism, engine simulation software was used. Design of a planetarycyclodrive speed reducer cycloid stage. See more on this video shows how to design a cycloidal gear with a normal cad system. In a hypocycloid or simply cycloid speed reducer, a flowershaped gear. A hypocycloid is obtained similarly except that the circle of. On the other hand, now suppose that the small circle rolls on the outside of the larger circle. The pins slide around the holes in response to the wobbling motion, but always remain engaged. Hypocycloid gear gearotic motion gear design software. For the most part, it is arranged into four kinds of the cycloid drives by the flap profile of the cycloid plate outfit and the roller gears movement.

The external gears produce a long travel compared to the internal gears, considering the overall gear sizes and workspace. How do cycloidal gears work and where are they used. These improvements reduce crankshaft stresses, ensure a compact crankshaft with convenient assembly and dissassembly, and control deviations from the desired straightline piston motion that are caused by gear tooth backlash. How to model a hypocycloid drive speed reducer in blender. For more free tutorials and 3d models, and to make a donation, please visit. The fixed, large gear can be made bigger and bigger until it becomes a fixed straight rack gear, rather than a circular gear. Mechanical efficiency prediction methodology of the hypocycloid gear mechanism for internal combustion engine application. The cycloidal tooth profile is generated by the hypoc. Mechanical friction power loss is one of the main concerns in the internal combustion engine ice systems. Oct 11, 2011 after going through a few books, i realized that the design procedure for cycloidal gears is pretty much the same as that involved in designing involute gears.

Also, what do you mean by pitch circle for outer and inner gears. See the hypocycloid at wikipedia for details of what a hypocyloid is. Simple epicycloid and hypocycloid gear mechanism straight. On the inside, it is called a contracted hypocycloid.

Free gear design software gear creator emachineshop. Epicycloid and hypocycloid main concept an epicycloid is a plane curve created by tracing a chosen point on the edge of a circle of radius r rolling on the outside of a circle of radius r. In a hypocycloid or simply cycloid speed reducer, a flowershaped gear called cycloid disk moves around a stationary ring of round pins in a cycloidal motion, driven by an eccentric bearing or. The gear tooth profile is based on the epicycloid and hypocycloid curves, which are the curves generated by a circle rolling around the outside and inside of another circle, respectively. The focus will be on the design described in british standard 978 part 2. Sign up a cycloid gear graphical calculator to design cycloidal drives. This video shows how to design a cycloidal gear with a normal cad system.

This video shows both and how they might be used to move a slide rail. The hypocycloid with two cusps is a degenerate but still very interesting case, known as the tusi couple. Hypocycloid and hypotrochoid curves hypotrochoid curves are produced by a point on a gear that rolls orbits around the inside of the fixed gear. Another way to visualize the involute of a circle is to imagine the curve that the end of a string wrapped around a cylinder would make as the string is unwrapped from the cylind. Derive a set of parametric equations for the resulting curve in this case. When the curve is on the pitch circle of the rolling gear, the curve is called a hypocycloid. At worst it might break a tooth off one of the gears. It is both an extension of the design and an explanation of how to create a hypocycloid gear reducer. Hypocycloid shapes can be related to special unitary groups, denoted suk, which consist of k. Building a cycloidal drive with solidworks by omar younis a cycloidal drive is a mechanism used in the engineering world as a speed reducer for an input. The pistonrod assembly and the complex motion of the connecting rod are the largest source of engine.

The gear profile below pitch circle can be straight radial lines or can be generated by the hypocycloid. Analysis and simulation of wiseman hypocycloid engine priyesh ray 1 and sangram redkar abstract. More details on the design can be found in british standard 978 part 2. This research studies an alternative to the slidercrank mechanism for internal combustion engines, which was proposed by the wiseman technologies inc. Mechanical efficiency prediction methodology of the. Involute spur gears spur, ring, and rack planetary gear sets using ring gears. High ratio cycloid set a single eccentrically mounted planet and a fixed internal gear. One curve is given by a point on the pitchcircle it is the hypocycloid. Im relatively new to the program, but i would like to assume that what i am aiming to do is possible. The remainder of the video shows the design this thing 25. How to model a hypocycloid drive in blender duration. Pin rollers extending from cycloidal disk holes transmit rotational motion to the follower shaft.

While not quite ready for customerizer, it should help a lot of people design these devices. Design and fabrication of cycloidal gearbox mechanical projects. W hen the carrier acts as the inp ut link and rotates o ne. This page will show you how to design these gears and the cutters used to. This is equivalent, i believe, to swiss standard nhs 26702. For example, the allowed values of the sum of diagonal entries for a matrix in su3, are precisely the points in the complex plane lying inside a hypocycloid of three cusps a deltoid. Another way to visualize the involute of a circle is to imagine the curve that the end of a string wrapped around a cylinder would make as the string is unwrapped from the cylinder. A hypocycloid is defined as the locus of a point on the circumference of a circle which rolls without slip around the inside of another circle. For \ k 3\, the hypocycloid will be a 3pointed shape called a deltoid and for \ k 4 \ it will be a 4pointed shape called an astroid. Pdf a new design of a twostage cycloidal speed reducer. Lobe pumps are sometimes called roots blowers after the inventor roots and blower because they were originally designed to pump air. Gear design software to model most gear arrangements. It can do everything that the online gear template generator can do, and much more. Analysis and simulation of wiseman hypocycloid engine.

Their design involved replacing the crankshaft with a hypocycloid gear assembly. Cycloidal drive motion animation cycloidal drive explode animation cycloidal drive solidworks files. How to model a hypocycloid drive in blender youtube. Hypocycloid gear read 31978 times 0 members and 2 guests are viewing this topic. Although the hypocycloid is out, he did manage to build a strange differential panroll. Torque on either the output shaft or the input shaft causes the shaft to bend offaxis, away from the point of contact between the inner gear and the housing. The main aim of this paper is to develop a new design method in designing new configurations of planetary epicycloid hypocycloid mechanisms.

Sep 19, 2014 this video shows how to design a cycloidal gear with a normal cad system. This section will focus on generation of the cycloidal gear profile. Patented design improvements over previous hypocycloid designs are described. The unique hypocycloid gear arrangement allowed the piston and connecting rod to move in a straight line creating a perfect sinusoidal motion, without any side loads. After going through a few books, i realized that the design procedure for cycloidal gears is pretty much the same as that involved in designing involute gears. The hypocycloid engineering drawing joshua nava arts. Cycloidal type gears development of the mathematical equations. A hypocycloid mechanism with simple planetary gear train is formed by a fixed ring gear, a, a planetary g ear,b, and a planetary carrier,c. In my quest to create new and interesting uses for my cnc mill, i found a link to darali drives. The stationary gear has inward facing teeth with the revolving gear orbiting inside. Why hypocycloids gearboxes dont appear to work details. The revolving gear is half the diameter of the fixed gear the revolving gear is inside, and is half the diameter of the fixed outside gear.

Parametric equations for hypocycloid and epicycloid. The wiseman engine with the hypocycloid piston motion was modeled in the software and the engines. Cycloidal type gears development of the mathematical equations for the cycloidal curve uses simple. For example, for \ k 2 \ the shape will be a straight line this system is known as the tusicouple, and was first investigated by nasir aldin altusi in 1247. The gear template generator program is a program for printing paper templates for cutting out gears. The cusps of each of the smaller curves maintain continuous contact with the nextlarger hypocycloid. These improvements reduce crankshaft stresses, ensure a compact crankshaft with convenient assembly and dissassembly, and control deviations from the desired straightline. The number of lobes is given by the ratio of gear teeth in the gear pair. Lets take a case with n 26 and dp 4 as in the case of involute gear.

When it is outside, it is called a protracted hypocycloid. A new design of a twostage cycloidal speed reducer article pdf available in journal of mechanical design 38. You can model most gear design arrangements and gear trains. In a hypocycloid there is no backlash because theres always lots of teeth touching. As torque on the sun increases, the force is transferred through all the planets at once to the outer gear.

With the help of our tutorial, you can design your own hypocycloid. In a traditional gearbox like a sunplanet arrangement, the forces are evenly distributed the planets are arranged around the sun. Imecs 2008, 1921 march, 2008, hong kong epicycloid. I just finished writing a cycloidal gear drive generator. The following online calculator computes the parametric equations of the cycloid disk of a hypocycloid drive. The unique hypocycloid gear arrangement allows the piston and the connecting rod to move in a straight line, creating a perfect sinusoidal motion. The real downside to sunplanet gears and also worm gears is that.

Design of a planetarycyclodrive speed reducer cycloid. To appreciate the benefits of this design, heres a rendering of a traditional 19part, three stage planetary. Pdf parametric design on internal gear of cycloid gear pump. Apr 25, 20 it is both an extension of the design and an explanation of how to create a hypocycloid gear reducer. Pdf design of cycloids, hypocycloids and epicycloids curves. Gearteq provides the designer with advanced tools for creating solid.

Mechdesigner software makes it easy to add gear pairs that will transmit motion and force naturally through the mechanisms linkages. This paper analyses the characteristics of the topological structures of existing planetary gear train type epicycloid hypocycloid mechanisms. D diameter of the ring on which the centers of the pins are positioned. The gear tooth profile is based on the epicycloid and hypocycloid curves, which are the curves generated by a circle rolling around the outside and inside of another circle, respectively when two toothed gears mesh, an imaginary circle, the pitch.