Bidirectional latch pin assembly, switchable rocker arm, and valvetrain assembly

A switchable rocker arm comprising:

• a bidirectional latch pin assembly comprising:
• a housing portion comprising a latch port,
• a latch pin in the latch port, the latch pin comprising a stepped nose extending from a body portion, the stepped nose comprising a first step and a second step,
• a guide mounted in the latch port,
• a spring biased against the guide and configured to bias the latch pin to a first position extending the first step out of the latch port,
• a first actuation assembly configured to move the latch pin to a second position extending the first step and the second step out of the latch port, and
• a second actuation assembly configured to move the latch pin to a third position pulling the first step and the second step into the latch port;
• an outer arm joined by the housing portion;
• and
• an inner arm configured to engage the latch pin in the first position or the second position or to move past the latch pin in the third position.

A valvetrain assembly comprising:

• a switchable rocker arm comprising:
• a bidirectional latch pin assembly comprising:
• a housing portion comprising a latch port,
• a latch pin in the latch port, the latch pin comprising a stepped nose extending from a body portion, the stepped nose comprising a first step and a second step,
• a guide mounted in the latch port,
• a spring biased against the guide and configured to bias the latch pin to a first position extending the first step out of the latch port,
• a first actuation assembly configured to move the latch pin to a second position extending the first step and the second step out of the latch port, and
• a second actuation assembly configured to move the latch pin to a third position pulling the first step and the second step into the latch port;
• an outer arm joined by the housing portion;
• an inner arm configured to engage the latch pin in the first position or the second position or to move past the latch pin in the third position;
• a hydraulic actuation assembly connected to the latch port to supply hydraulic control fluid to move the latch pin in a first direction;
• and
• an actuator system configured to supply mechanical actuation force to move the latch pin in a second direction.