Automotive Applications - Pistons, Pins and Rings Measurement

Automotive Applications
Cylinder heads and blocks	Wheel drum and brake disk
Pistons, pins and rings	Camshaft and Crankshafts
Fuel Injectors	Connecting Rods
Panels and Fascia	Transmission

Pistons, pins and rings

Overview
There are many stresses and strains exerted on a piston during its use all causing some form of distortion.Piston designers attempt to predict this distortion by manufacturing the piston to allow for these effects. Because of the shape of the piston normal geometrical analysis such as cylindricity, roundness and straightness are not enough on their own to define the shape of the piston. Taylor Hobson’s long association with Piston manufacturers have enabled measurement solutions.

Radial and axial form of pistons, high precision cylindricity of gudgeon/wrist pins or even thickness variation and form of piston grooves can be assessed utilising Taylor Hobson’s range of roundness measuring instruments as detailed in the Talyrond links below.

When looking at wear or friction qualities of piston rings and pins or sealing faces of ring grooves Taylor Hobson surface finish range of instruments can provide the answer as detailed in the Form Talysurf links below.

Form Talysurf Inductive Systems
For accurate measurement of roughness, waviness and form of pistons, pins and rings.

Form Talysurf PGI Measurement Systems
Provides large gauge range/high resolution roughness,waviness and form measurement.

Talyrond 365
Provides highly accurate measurement of radial and axial form of pistons as well as roundness/cylindricity on pins and pin bores.

Talyrond 385
Motorised arm orientation provides full automated measurement of radial and axial form on pistons as well as roundness/cylindricity on pins and pin bores.

Piston Software
All of Taylor Hobson roundness instruments capable of straightness measurement can provide measurement of the geometrical form of a piston.Piston software can then provide analysis of the radial and axial shape of the piston and compare this to the design data. Results output provides both tolerancing and feedback to the machining process. Alignment of the gudgeon/wrist pin bore to the piston major and minor axis is also possible via a dumbbell or optical trigger device.

For further details contact your local sales representative