- published: 17 Feb 2016
- views: 1722
In a reciprocating piston engine, the connecting rod or conrod connects the piston to the crank or crankshaft. Together with the crank, they form a simple mechanism that converts reciprocating motion into rotating motion.
Connecting rods may also convert rotating motion into reciprocating motion. Historically, before the development of engines, they were first used in this way.
As a connecting rod is rigid, it may transmit either a push or a pull and so the rod may rotate the crank through both halves of a revolution, i.e. piston pushing and piston pulling. Earlier mechanisms, such as chains, could only pull. In a few two-stroke engines, the connecting rod is only required to push.
Today, connecting rods are best known through their use in internal combustion piston engines, such as automotive engines. These are of a distinctly different design from earlier forms of connecting rods, used in steam engines and steam locomotives.
The earliest evidence for a connecting rod appears in the late 3rd century AD Roman Hierapolis sawmill. It also appears in two 6th century Eastern Roman saw mills excavated at Ephesus and Gerasa. The crank and connecting rod mechanism of these Roman watermills converted the rotary motion of the waterwheel into the linear movement of the saw blades.
Con Rod fracturing by Tri-Way Manufacturing Tech , Windsor, Ontario
Here's another connecting rod modification that John Edwards of Costa Mesa R&D; Automotive Machine performs to reduce reciprocating weight. www.engine-machining.com (949) 631-6376
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See how connecting rods are balanced by John Edwards @ Costa Mesa R&D;, www.engine-machining.com 949-631-6376
Describing some misconceptions about connecting rod side play.
how to replace piston connecting rod bearings
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Conrad the Caterpillar thought he was really killer,
Couldn't wait to build a cocoon (original lyrics)
Couldn't wait to buy blue suede shoes (recent lyrics)
Spent all his days eatin' leaves in the shade
And stayed when the night set, too.
Conrad the Caterpillar knew life would be a thriller
Soon as the threads was spun
Wouldn't stop to play in the Caterpillar Games
Till his own webbing game was done.
He said, "No, no, I got no time to play,
Got a thousand little legs that don't get me too far in a day,
I'm leaving, looks like I can't stay."
That little pillar he found him a willow
Spun in with a craftsmans weave
Wound so tightly to protect him from the light
And all shapes of water that drop from the leaves
Conrad the Caterpillar knew he would be a chiller
And he wound it tighter some more
Wound it so wide and the ends of his legs got sore.
He said, "No, now I can't feel my feet
Just when I thought it was time to take a stroll on down the street
I'm leaving, looks like I can't leave
What do you know?
What's all this moving around with inside me?
What kind of 'piller could touch the world of a miller
Chopping trees to build a new store
Nobody sees a lonely bump on the tree
Except a lump who's crying for more
Conrad the Caterpillar knew life would be a chiller as he wound it tighter some more
Anybody stands in the caterpillar's place is moving in a standing run
He said, "No brother, I just need some room to fly,
I spent all of my days just trying to keep dry
Oh I'd take a waterfall or a drop from my eye
I can't see nothin' from here anyway, I might as well make room and try
Might as well try
Oh no, I just need a little room to play
Got a thousand little wings and I'm gonna use them all today