Cylinder connections are used to enable rotation along a single
axis with unconstrained axial translation.
• References (constraint rules):
– Axis Alignment to enable rotation
about a single axis.
♦ Use axes or cylindrical surfaces.
• Examples include:
– Aligning a pen cap over a pen.
– Connecting rod.
♦ Assuming one end is defined
with a Pin connection.
♦ Avoids overconstraining.
Figure 1 – Axis Alignment
Assembling Components using the Cylinder Connection
Cylinder connections are used to enable both rotation and translation about
a specific axis. For example, aligning a pen cap over a pen is a Cylinder
connection. While holding the pen cap aligned with the pen, you can rotate
the pen cap and slide it along the axis of the pen.
Cylinder connections require only one constraint rule that limits their degrees
of freedom about a specific axis. The constraint rule is:
• Axis Alignment — The axes or cylindrical surfaces you select as references
determine the axis of free rotation and translation.
Cylinder connections are often used in situations in which you do not want to
overconstrain a component. In the hedge trimmer example, a Pin connection
between the connecting rod and the blade prevents the connecting rod from
sliding in and out of the journal. As a result, a Cylinder connection is suitable
to constrain the other end of the connecting rod to the crankshaft.