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You should soon be able to do this, although you may know enough already. I usually don't bother with empirical formulae if one can be derived on a scientific basis. RE: Cam profile design EngJW (Mechanical)Ĭan you supply the SAE number of the paper? I don't have the book but might have the paper. I'm sure someone can shed some light on this though. I'm a sophomore in college working towards an ME degree so I'm kinda stuck waiting til I have a better understanding of kinematics and dynamics before I can extrapolate anything from this on my own. I post this in hopes that someone can maybe explain it. Sorry for the length but wanted to get everything into context there. In order to predict the engine speeds at which valve jumping and valve bouncing will begin, we empirically determined the value C as follows: G = acceleration of gravity 9.8x10^3, mm/sec^2 Y = maximum negative acceleration, mm/rad^2 W = equivalent inertia weight of valve train, kg The equation generally used in valve mechanism design is expressed as:įs = valve spring force at maximum lift, kg It can be seen that the abnormal motion begins at a higher engine speed for the tappet-type, which can be attributed to the higher ridgity of this system. The equivalent inertia weight of the moving parts in the valve train.įor the tappet-type and rockerarm-type of overhead cam valve mechanisms, we determined the engines speeds at the initiation of abnormal valve motion (such as jumping or bouncing) and plotted these data as a function of the equivalent inertia weight of the valve train. The degree of ridgidity in the valve train.Ģ. The main factors influencing valve motion are:ġ. "VALVE MOTION- Abnormal inlet and exhaust valve motion is a major obstacle in the development of high-speed engines. Here's the excerpt which deals with abnormal valve motion: If you're not familiar with the book (ISBN 1-56091-601-X) it is basically a collection of SAE papers. There is a formula in Joseph Harralson's "Design of Racing and High Perforance Engines" that might be of some help to you. John Woodward RE: Cam profile design ProgressiveRacing (Automotive) 1 Mar 03 17:12 To meet your immediate needs it may be best for you to go by the cam manufacturers recommendation, especially if they offer a kit. Of course, none of this has answered your question. The exhaust valve has to be opened against cylinder pressure, which can cause high forces, and in a turbo engine the exhaust port pressure cam overcome the spring seating pressure. It is not enough to do the calculation at max lift, as there could be points in the early stages of lift where the curves get close together.Įxhaust pressure also needs to be considered. There should be more spring force than inertia force at every degree. Next, calculate the spring force applied to the valve at every degree and plot it on top of the inertia force. You calculate the inertia force on the valve train created by the cam acceleraton, using the above equation. For the spring you need to know the compressed load at one point and the spring rate. You already have the weight of all your components. You have to know the cam profile to get the valve lift and acceleration at every degree. They usually take a lot of manipulation to put them in a workable form and then they are too time consuming to use unless you write a program. I don't know of any that you can use as is.
Cam profile design software download#
Maintenance customers will receive the new version via download link per e-mail.There are equations scattered about in the literature but nothing basic. new 2D milling functions with improved simulation new Adaptive Roughing for High Performance Machining Since the beginning of March our current CAD/CAM solution EUKLID is available for download.ĮUKLID V18-SP1 contains numerous improvements and performance enhancements: Maintenance customers will receive the new version via download link per e-mail in the next days.
Cam profile design software license#
You need a new license activation file to run EUKLID GearCAM V3.2.
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completely revised Internal Gear Module.
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This makes the definition and programming of gears even more efficient. The latest version of EUKLID GearCAM will be released at EMO 2019.ĮUKLID GearCAM V3.2 offers improvements and innovations in all areas. Events News EUKLID GearCAM V3.2 available!