Piston Engine Solidworks

[Janne Evers]

Inthis blog we will discuss the mechanisms that I created and explain the steps I took to make them.The radial engine has been used for over a hundred years, mainly in aircraft. It was the primary type of engine used in World War I aircraft on the allied side. It was also used in many American armored vehicles in World War II. It is still used in some Russian aircraft and other homebuilt aircraft. It is a very interesting engine to create, connecting all eight cylinders to the one crank.

Now that I had one cylinder made, I had to think about how to make eight of them run in conjunction. I started off by making a four-cylinder version, offsetting the connecting rods from their respective pistons to make sure no links overlapped. The alignment was accomplished by using the parallel and perpendicular mates to keep the pistons and connecting rods in line. Once again, I used the instant motion feature to simulate the proper motion. The real trick came when I decided to make an eight-cylinder version. This required me to put angle mates between the crank and the new piston. Once each cylinder was in place, I fixed it in place so that I could move the rest of the mechanism without disrupting the alignment I had just created. I repeated this for each cylinder, and eventually arrived at the final version with eight cylinders. Using the same motion study that I created for the four-cylinder version, I got the engine running.

A rotary engine, also known as a Wankel engine, works by using a triangular rotor that rotates inside a chamber. The rotor has three sides, each of which acts as a piston. As the rotor rotates, it compresses the air-fuel mixture, ignites it, and then expels the exhaust gases. This process repeats continuously, resulting in a smooth and efficient engine operation.

One of the main advantages of a rotary engine is its compact size and lightweight design. It also has a high power-to-weight ratio, making it suitable for high-performance vehicles. Rotary engines also have fewer moving parts, which means less friction and wear, resulting in lower maintenance costs. Additionally, they have a smoother operation and produce less vibration than traditional piston engines.

The design of a rotary engine involves several factors, including the size and shape of the rotor, the chamber dimensions, and the intake and exhaust ports. The complex shapes of a rotary engine are typically designed using computer-aided design (CAD) software, which allows for precise and efficient design. The design process also involves extensive testing and simulation to ensure optimal performance and efficiency.

One of the main challenges in designing a rotary engine is achieving a good balance between power and fuel efficiency. The shape and size of the rotor and chamber can greatly affect the engine's performance, and finding the optimal design can be a complex and time-consuming process. Another challenge is reducing the engine's emissions, as rotary engines tend to produce higher levels of pollutants compared to piston engines.

The main difference between a rotary engine and a traditional piston engine is the way they convert fuel into energy. In a piston engine, the fuel is ignited in a cylinder, and the resulting pressure moves a piston, which then turns a crankshaft. In a rotary engine, the fuel is ignited inside a chamber, and the resulting pressure rotates a triangular rotor. This difference in operation leads to distinct advantages and disadvantages for each type of engine.

This is the third in our series of posts where we are sharing drawings for the White Horse CAD Wobbler Engine. This week we will look at the Wobbler Engine Piston Bearing. This post is a day late because we had a few technical issues with the website.

This bearing is a relatively simple part but there are some tight tolerances on the inside and outside diameter (H7 and f8). These tolerances are required to ensure there is sufficient clearance between mating parts. If the clearance is too small the parts may not fit together at all or there will be too much friction when the engine runs. If the clearance is too large the finished engine may be noisy and the bearings will most likely wear prematurely.

The undercut feature in Detail B often raises questions. Its purpose is to guarantee there will be no interference between mating parts. The 0.4mm radii is found on many tungsten carbide cutting inserts. However, this feature is intended to be created by using an insert with smaller radii (0.2mm) by using circular interpolation on a CNC lathe.

You will notice 2 slot features in the view on the right? Both of these serve a very important purpose. The top slot feature is a lubrication channel that runs for the full length of the bearing. The bottom slot feature is an anti-rotation feature that will stop the bush spinning in the piston when it is in motion.

Hey there folks, I'm a manufacturing engineer senior working a senior project that involves making a casted aluminum piston head. I've only had experience using solidworks but its been two years since I've done the class and I could really use the help is someone would take the time to go step by step in making it.

Hey andy, do you have any sketches of the piston? Is there anything special about it? 4 stroke or 2 stroke?. In the ring groove for the bottom ring(oil scraper ring, looks like a wave) there will be oil passages. These oil passages also go to the wrist pin. Here is a good cutaway I found.

You definitely need to start with a revolve operation. The images I uploaded were of a two stroke piston but the major difference is going to be the oil control ring and oil passages. If you put up some more info we can get you going in the right direction. Even better if you have a piston you are trying to replicate. I think i have a few 4 stroke pistons laying around if you need some pictures.

Your a genius! To be honest with you thought I don't believe I got the time to remember the basics to draw something up this awesome, to give you more detail here are some pics I found and the dimensions of the piston head. Its an LS1 piston head for GM's 5.7L V8.

4. cross section showing that i only cut the hole part way into the body and mirrored it to the other side. This is because of the shell operation. You cont need to use shell, you could revolve the inside and outside of the piston, then add material for the piston pin. It really depends on what the underside of the piston looks like.

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I'm looking for complete specifications and dimensions for a M10 forged piston. I would prefer for a late 70's 2.0L engine since this was the largest stock M10 of the correct era. I am assuming this is referred to as a M10 B20, 1990cc.

Interesting looking piston, (the one used as the example with the arrows and letters) wedge head SB Chev around 10 to 1 with a long rod or 400 crank. I like your approach, personally I would use a Dykes or .043 top, as gas porting, vertical or horizontal on anything but a race motor can be problematic. The ports tend to clog with combustion stuff, and without the pressure backing the low tension tops can incur blow-by at speed. I like the oversize oil returns on the oil ring, great idea that really augments oil control. Your alloy selection is by far the most durable being the material of choice originating form WW2 allied aircraft power-plants.

Not sure I understand -- are you are just doing an exercise here, or do you actually plan to produce realistic drawings of workable parts? For any type of modeling to be useful, I'd think you'd need to establish a baseline with known parts. It would probably make sense to do that with a few variations of stock parts. To get the detail needed to actually do that, you cannot rely on message board info, you would be best to get the parts in hand to check all the features & dimensions. Once you've compared two or more versions of the stock hardware, confirm if your modeling shows the same difference that has been measured in the real world.

Here too, I'm not sure you're on track to get anything like a 'complete' piston drawing, because there is a LOT more you'd have to capture to get that done. Not that you need complete specs for a piston to get parts made, in fact it is much more common to rely on the piston company to use their expertise in working with the forgings they have available. You don't spec their forgings, so it is pointless to produce a 'complete' print that might include dimensions that don't comprehend the raw forging.

Typically the end user just defines the dome or dish (if any) and all the other normal features that can be readily customized. The only feature the customer might need to supply a detailed drawing for would be a dome, dish, or valve relief if needed.

On that matter, the expansion rates of 2618 won't be like a stock piston, so the actual piston shape is quite different. While neither cast or forged pistons are round, the ability to predict what different diameters and how to shape them to be round at operating temp is beyond what anyone without more intimate knowledge of the actual forgings used could be expected to have.

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