A rocker bogie includes a first base which including a first wheel, a second wheel, and a third wheel each of which is configured to be in contact with a first flat surface, a second base including a fourth wheel which is configured to be in contact with the first flat surface, and a rotary shaft co
A rocker bogie includes a first base which including a first wheel, a second wheel, and a third wheel each of which is configured to be in contact with a first flat surface, a second base including a fourth wheel which is configured to be in contact with the first flat surface, and a rotary shaft connecting the first base and the second base to each other such that the second base is rotatable with respect to the first base. The rotary shaft is parallel to a first straight line which connects a rotation center of the first wheel and a rotation center of the second wheel to each other and is disposed between a rotation center of the third wheel and the first straight line, and the fourth wheel is disposed at an opposite position to the third wheel across the first straight line.
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1. A rocker bogie, comprising: a first base including a first wheel, a second wheel, and a third wheel each of which is configured to be in contact with a first flat surface;a second base including a fourth wheel which is configured to be in contact with the first flat surface; anda rotary shaft con
1. A rocker bogie, comprising: a first base including a first wheel, a second wheel, and a third wheel each of which is configured to be in contact with a first flat surface;a second base including a fourth wheel which is configured to be in contact with the first flat surface; anda rotary shaft connecting the first base and the second base to each other such that the second base is rotatable with respect to the first base, wherein the rotary shaft is parallel to a first straight line which connects a rotation center of the first wheel and a rotation center of the second wheel to each other and is disposed between a rotation center of the third wheel and the first straight line in a forward-rearward direction, the fourth wheel is disposed at an opposite position to the third wheel across the first straight line, andwhen viewed in a right-left direction, a ratio of a distance from a ground contact position of the third wheel to the rotary shaft in the forward-rearward direction to a distance from the first straight line to the rotary shaft in the forward-rearward direction is 2:1. 2-9. (canceled) 10. The rocker bogie according to claim 1, wherein when viewed in the right-left direction, a ratio of a distance from a ground contact position of the fourth wheel to the first straight line in the forward-rearward direction to a distance from the rotary shaft to the first straight line in the forward-rearward direction is 3:1. 11. The rocker bogie according to claim 1, further comprising: a structure placed on the second base, whereina center of gravity of the structure is positioned between the rotation center of the fourth wheel and the rotary shaft in a plan view. 12. The rocker bogie according to claim 1, further comprising: a rotation-braking mechanism which restricts rotation of the rotary shaft in a direction in which the fourth wheel moves away from a ground contact surface when the fourth wheel moves away from the ground contact surface. 13. The rocker bogie according to claim 1, wherein in a state where the rocker bogie is placed on a horizontal surface, a position of the rotary shaft in a vertical direction is the same as or vertically below a position of the first straight line. 14. A rocker bogie, comprising: a first base including a first wheel, a second wheel, and a third wheel each of which is configured to be in contact with a first flat surface;a second base including a fourth wheel which is configured to be in contact with the first flat surface; anda rotary shaft connecting the first base and the second base to each other such that the second base is rotatable with respect to the first base, whereinthe rotary shaft is parallel to a first straight line which connects a rotation center of the first wheel and a rotation center of the second wheel to each other and is disposed between a rotation center of the third wheel and the first straight line in a forward-rearward direction,the fourth wheel is disposed at an opposite position to the third wheel across the first straight line, andwhen viewed in a right-left direction, a ratio of a distance from a support shaft of the third wheel to the rotary shaft in the forward-rearward direction to a distance from the first straight line to the rotary shaft in the forward-rearward direction is 2:1. 15. The rocker bogie according to claim 14, wherein when viewed in the right-left direction, a ratio of a distance from a support shaft of the fourth wheel to the first straight line in the forward-rearward direction to a distance from the rotary shaft to the first straight line in the forward-rearward direction is 3:1. 16. The rocker bogie according to claim 14 further comprising: a structure placed on the second base, whereina center of gravity of the structure is positioned between the rotation center of the fourth wheel and the rotary shaft in a plan view. 17. The rocker bogie according to claim 14, further comprising: a rotation-braking mechanism which restricts rotation of the rotary shaft in a direction in which the fourth wheel moves away from a ground contact surface when the fourth wheel moves away from the ground contact surface. 18. The rocker bogie according to claim 14, wherein in a state where the rocker bogie is placed on a horizontal surface, a position of the rotary shaft in a vertical direction is the same as or vertically below a position of the first straight line.
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