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Any straight link that transmits motion or power from one linkage to another within a mechanism, especially linear to rotary motion, as in a reciprocating engine or compressor.



Related Terms

VALVE LIFTER

Sometimes called a 'cam follower', a component in engine designs that use a linkage system between a cam and the valve it operates. The lifter typically translates the rotational motion of the cam to a reciprocating linear motion in the linkage system.

FLAT BELT

A power transmission belt, in the form of leather belting, used where highspeed motion rather than power is the main concern.

BIG END BEARING

A bearing at the larger (crankshaft) end of a connecting rod in an engine.
The bearings are made of cast steel and each consist of an upper and lower part secured to the connecting rod by means of fitting bolts, the nuts of which are secured. Compression shims are provided between the bottom end bearing and the palm of the connecting rod.
The bearings have white metal bearing surfaces provided with lubrication grooves for the necessary supply of lubricating and cooling oil. Shims of different thickness are inserted between the shells to enable adjustment of the bearing clearances (approx. 0.20-0.30mm).

OPTICAL INDICATOR

An instrument which makes a plot of pressure in the cylinder of an engine as a function of piston (or volume) displacement, making use of magnification by optical systems and photographic recording; for example, the small motion of a pressure diaphragm may be transmitted to a mirror to deflect a beam of light.

PLANAR LINKAGE

A linkage that involves motion in only two dimensions.

CAM MECHANISM

A mechanical linkage whose purpose is to produce, by means of a contoured cam surface, a prescribed motion of the output link.

RATED SPEED

The crankshaft revolutions per minute at which the rated power occurs as specified on the nameplate and in the technical file of the engine.

MAIN SHAFT

The line of shafting receiving its power from the engine or motor and transmitting power to other parts.

PISTON ENGINE

A type of engine characterized by reciprocating motion of pistons in a cylinder. Also known as displacement engine; reciprocating engine.

STERNDRIVE

A propeller drive system similar to the lower part of an outboard motor extending below the hull of a larger power boat or yacht, but driven by an engine mounted within the hull. Unlike a fixed propeller (but like an outboard), the boat may be steered by twisting the drive.

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