Valve Cam Exercise

1
Valve Cam Exercise

• Problem Statement
• Open Valve_Cam.sldasm
• The valve cam model pictured above includes a
  spring that will be added between the valve guide
  and the valve. The camshaft will be rotated at
  an angular velocity of 36,000 deg/s.
• Define Moving and Ground parts.
• Using curve/curve contact, create a spring with
  the correct stiffness and free length so that the
  camshaft and rocker are always in contact.
• We are going to plot the
• Cam and Rocker contact force
• Valve and Rocker contact force
• Valve and cam contact force

2
Valve Cam Exercise

• Define Moving and Ground Parts

rocker
rocker_shaft
valve_guide
shaft_mount
camshaft
valve
Valve_Cam.sldasm
3
Valve Cam Exercise

• Add Revolute Motion

Angular Velocity 36,000 deg/s
4
Valve Cam Exercise

• Add Curve/Curve Intermittent Contact

Select face

• Points Per Curve 20
• Check Intermittent Contact box

ARROWS MUST POINT INSIDE SOLID
5
Valve Cam Exercise

• Add Curve/Curve Intermittent Contact

Add contact between valve and rocker

• Points Per Curve 20
• Check Intermittent Contact box

6
Valve Cam Exercise

• Modify Contact Properties for both Contacts

7
Valve Cam Exercise

• Add a Linear Spring

8
Valve Cam Exercise

• Set Simulation Parameters

Run Simulation
9
Valve Cam Exercise

• Plot Results

Cam and Rocker Contact Force
Valve and Rocker Contact Force
10
Valve Cam Exercise

• Modify Spring
• Stiffness 150 N/mm
• Free Length 45 mm

• Re-run Simulation

Contact Between Valve and Cam