Outboard motor and anti-vibration structure of outboard motor

An outboard motor comprising:

• an outboard motor main body;
• a mount assembly to mount the outboard motor main body to a hull, the mount assembly including a clamp bracket to be fixed to the hull and a swivel bracket that is coupled to the clamp bracket through a tilt shaft, turnable around the tilt shaft, and supports the outboard motor main body;
• a hydraulic cylinder between the clamp bracket and the swivel bracket to turn the swivel bracket around the tilt shaft with respect to the clamp bracket;
• and
• a gas damper to damp an external force that acts in a telescopic direction of the hydraulic cylinder;
• wherein
• the hydraulic cylinder includes a cylinder main body, a piston slidable in the cylinder main body and defining a pair of oil chambers in the cylinder main body, and a rod extending outwardly from the cylinder main body through one of the pair of oil chambers, and is operable to extend and contract the rod by selectively supplying hydraulic oil from a hydraulic circuit to either one of the pair of oil chambers;
• and
• the gas damper includes a sub-cylinder hydraulically connected to at least one of the pair of oil chambers.

An outboard motor comprising:

• an outboard motor main body;
• a mount assembly to mount the outboard motor main body to a hull, the mount assembly including a clamp bracket to be fixed to the hull and a swivel bracket that is coupled to the clamp bracket through a tilt shaft, turnable around the tilt shaft, and supports the outboard motor main body;
• a hydraulic cylinder between the clamp bracket and the swivel bracket to turn the swivel bracket around the tilt shaft with respect to the clamp bracket;
• and
• a gas damper to damp an external force that acts in a telescopic direction of the hydraulic cylinder;
• wherein
• the hydraulic cylinder includes a cylinder main body, a piston slidable in the cylinder main body and defining a pair of oil chambers in the cylinder main body, and a rod that extends outwardly from the cylinder main body through one of the pair of oil chambers, and is operable to extend and contract the rod by selectively supplying hydraulic oil from a hydraulic circuit to either one of the pair of oil chambers;
• the piston includes a hollow piston including a cylindrical inner peripheral surface that defines a gas chamber filled with gas;
• and
• the gas damper includes a double piston structure including the hollow piston and an internal piston housed in the hollow piston slidable on the inner peripheral surface, that is coupled to the rod, and partitions the gas chamber into a pair of gas chambers.