Patent ID: 9272589
Filing Date: 2016-03-01
CPC Classification: B60D,B60L,B62B,B62K

Claim Text:
1. A carrier vehicle comprising: a coaxial two-wheel vehicle comprising two wheels arranged on a same axial centerline; a cart disposed in front of the coaxial two-wheel vehicle; and a coupling mechanism to couple the coaxial two-wheel vehicle with the cart, wherein when a traveling direction is defined as a roll axis, the coaxial two-wheel vehicle performs a turning action by rotating a vehicle main body in a roll direction, wherein the coupling mechanism comprises: a pin disposed in one of the coaxial two-wheel vehicle and the cart; and a pin receiving member disposed in another of the coaxial two-wheel vehicle and the cart, an insertion hole having an internal diameter larger than an external diameter of the pin being formed in the pin receiving member, wherein the pin is disposed in a roughly vertical direction; an end portion of the pin is inserted into the insertion hole of the pin receiving member; and a roll rotation tolerance portion that tolerates, not only, rotation of the vehicle main body in the roll direction, but also relative vertical sliding between the pin and the pin receiving member that occurs when the vehicle main body rotates in the roll direction, and a pitch rotation tolerance portion that tolerates, when a left-and-right direction of the coaxial two-wheel vehicle is defined as a pitch axis, not only rotation of the coaxial two-wheel vehicle in a pitch direction but also relative vertical sliding between the pin and the pin receiving member that occurs when the coaxial two-wheel vehicle rotates in the pitch direction are formed between the end potion of the pin and the insertion hole of the pin receiving member, wherein, in order to prevent the coaxial two-wheel vehicle from toppling over, the coaxial two-wheel vehicle has a pitch-tilting control state in which: wherein a height of the pin is set so that the pin is removed from the pin insertion hole of the pin receiving member by rotating the coaxial two-wheel vehicle backward even further compared to a maximum backward rotational angle in the pitch-tilting control of the coaxial two-wheel vehicle, and the pin is inserted into the pin insertion hole of the pin receiving member by rotating the coaxial two-wheel vehicle forward in the pitch direction from a state where the coaxial two-wheel vehicle is rotated backward even further compared to the maximum backward rotational angle in the pitch-tilting control of the coaxial two-wheel vehicle.