You can easily use the "Prismatic Joint"-Block, which is for purely translational movement along one axis. Just set the following options:
As Input you provide a "Sine Wave" that you configure to your needs (e.g. change phase to convert to cosine). Note that you need to convert the Simulink signal to a physical signal with the "Simulink-PS Converter" converter.
A few elaborations
Instead of using the "Spring and Damper Force"-Block you can also provide Spring Stiffness and Damping Coefficent (under Internal Mechanics) inside of the (Prismatic/Revolute) joint-Block. This can simplify your model. Since you are using a Revolute-Joint in your model I'm guessing that your drawing does not reflect the whole model, but you are rather building a real pivot of some kind. In this case using the Blocks in your configuration might already be the better solution.
