Cylinder Assembly

Onshape 3D CAD Assembly Mates

The barrel is shown transparent so the piston and its seals are visible through the full stroke.

Overview

A cylinder assembly modelled in Onshape. I built the parts, combined them into an assembly with mates, and animated the piston and rod through the full stroke.

Piston with multiple seal grooves, running in a cylindrical barrel.
Piston rod exiting through a rod-end cap on the mounting side.
Square mounting flange with four through holes.
Two ports on the barrel, one near each end cap.

Next steps

Parameterized stroke length. Drive the model from a stroke length parameter, so one model covers different strokes.
Mounting variants. Design additional variants with trunnion and rear end flange mounting.
Tie rod construction. Add a tie rod version, with the end caps held together by tie rods along the barrel.