Robot

A robot comprising:

• a base;
• a driving wheel protruding downward from the base;
• a plate spaced upward from the base;
• a suspension bar extending vertically from the base toward the plate;
• a spring disposed on an outer circumference of the suspension bar;
• a slider configured to slide along the suspension bar at a lower side of the spring and connected to the driving wheel;
• a bushing top configured to slide along the suspension bar on an upper side of the spring;
• a motor disposed above the plate;
• a long hole formed in the plate;
• and
• a cam configured to be rotated by the motor and to press the bushing top downward through the long hole,
• wherein the cam comprises:
• a pair of cam bodies configured to press the bushing top downward and are spaced apart from each other;
• and
• a connection shaft connecting the pair of cam bodies, located on an upper side of the plate, and extending in a horizontal direction,
• the robot further comprises:
• a rotation shaft connected to the motor and extending in a direction parallel to the connection shaft;
• and
• a chain or belt connecting the rotation shaft and the connection shaft.

A robot comprising:

• a base;
• a pair of driving wheels protruding downward from both sides of the base;
• a plate spaced upward from the base;
• a pair of suspension bars vertically extending from the base toward the plate;
• a pair of springs disposed on outer circumferences of the pair of suspension bars;
• a pair of sliders configured to slide along the pair of suspension bars at a downside of the pair of springs and connected to the pair of driving wheels;
• a pair of bushing tops configured to slide along the pair of suspension bars at an upper side of the pair of springs;
• a motor disposed above the plate;
• a plurality of long holes formed at the plate;
• and
• a plurality of cams configured to be rotated by the motor and to press the pair of bushing tops downward through the plurality of long holes,
• wherein each of the plurality of cams comprises:
• a pair of cam bodies configured to press the bushing top downward and are spaced apart from each other;
• and
• a connection shaft configured to connect the pair of cam bodies and extending in a horizontal direction and located on an upper side of the plate;
• the robot further comprising:
• a rotation shaft coupled to the motor;
• and
• a plurality of chains or a plurality of belts configured to connect the rotation shaft and the plurality of connection shafts.