Door assembly for a vehicle

1. A door assembly for a vehicle, the door assembly comprising:

a door body; and

a hinge connected to the door body, the hinge is rotatable about an axis thereof, the hinge configured to axially expand along the axis from a contracted position to an expanded position when rotated in a first direction, and the hinge configured to axially contract along the axis from the expanded position to the contracted position when rotated in a second direction that is opposite to the first direction;

wherein in the contracted position the door body is in a closed position and in the expanded position the door body is in an open position; and

wherein in the open position mass of the door body is centered over the axis of the hinge to retain the door body in the open position, which is a raised position.

2. The door assembly of claim 1 , wherein:

the hinge includes a base and a door guide in cooperation with the base; and

one of the base and the door guide is mounted to the door body, and another one of the base and the door guide is mounted to a chassis of the vehicle.

3. The door assembly of claim 2 , wherein the base is in rotational cooperation with the door guide, and the axis of the hinge extends through an axial center of each one of the base and the door guide.

4. The door assembly of claim 2 , wherein the door guide includes a plurality of helical members in cooperation with the base, each one of the helical members extends around and along the axis of the hinge.

5. The door assembly of claim 2 , wherein the door guide includes a plurality of helical channels and the base includes a plurality of posts, each one of the plurality of posts is in cooperation with a different one of the plurality of helical channels.

6. The door assembly of claim 5 , wherein in the contracted position of the hinge the plurality of posts are at a first end of each of the plurality of helical channels, and in the expanded position of the hinge the plurality of posts are at a second end of each of the plurality of helical channels;

wherein the posts slide along the plurality of helical channels as the hinge is rotated from the contracted position to the expanded position.

7. The door assembly of claim 6 , wherein each one of the plurality of posts is in a common plane perpendicular to the axis of the hinge.

8. The door assembly of claim 1 , further comprising a door support member that supports the door body in the open position.

9. The door assembly of claim 8 , wherein the door support member is a strut.

10. The door assembly of claim 9 , wherein the strut is arranged such that the strut is fully compressed when the door body is midway between the closed position and the open position.

11. The door assembly of claim 10 , wherein the strut is arranged such that the strut is fully extended when the door body is in the closed position and fully extended when the door body is in the open position.

12. The door assembly of claim 1 , further comprising a striker and a latch configured to retain the striker, the striker is connected to one of the door body and a chassis of the vehicle, and the latch is connected to a different one of the door body and the chassis.

13. A vehicle comprising:

a chassis defining a passenger compartment and an opening to the passenger compartment, a first axis extends along a length of the chassis between a front and a rear of the chassis, and a second axis extends along a width of the chassis perpendicular to the first axis; and

a door assembly mounted to the chassis, the door assembly including a hinge connected to a door body, the hinge is rotatable about a hinge axis, the hinge configured to expand along the hinge axis from a contracted position to an expanded position when rotated in a first direction, and the hinge configured to contract along the hinge axis from the expanded position to the contracted position when rotated in a second direction that is opposite to the first direction;

wherein:

in the contracted position the door body is in a closed, lowered position to restrict access to the passenger compartment, and in the expanded position the door body is in an open, raised position to permit access to the passenger compartment;

the hinge moves the door body outward from the passenger compartment, parallel to the hinge axis, as the door body is moved from the closed, lowered position to the open, raised position; and

the hinge moves the door body inward towards the passenger compartment, parallel to the hinge axis, as the door body is moved from the open, raised position to the closed, lowered position; and

in the open, raised position mass of the door body is centered over the hinge axis to retain the door body in the open, raised position.

14. The vehicle of claim 13 , wherein:

the hinge includes a base and a door guide in cooperation with the base; and

one of the base and the door guide is mounted to the door body, and another one of the base and the door guide is mounted to the chassis of the vehicle.

15. The vehicle of claim 14 , wherein the base is in rotational cooperation with the door guide, and the hinge axis extends through an axial center of each one of the base and the door guide.

16. The vehicle of claim 14 , wherein the door guide includes a plurality of helical members in cooperation with the base, each one of the helical members extends around and along the hinge axis.

17. The vehicle of claim 14 , wherein:

the door guide includes a plurality of helical channels and the base includes a plurality of posts, each one of the plurality of posts is in cooperation with a different one of the plurality of helical channels;

in the contracted position of the hinge the plurality of posts are at a first end of each of the plurality of helical channels, and in the expanded position of the hinge the plurality of posts are at a second end of each of the plurality of helical channels;

the posts slide along the plurality of helical channels as the hinge is rotated from the contracted position to the expanded position;

each one of the plurality of posts is in a common plane perpendicular to the hinge axis.

18. A door assembly for a vehicle, the door assembly comprising:

a door body; and

a hinge connected to the door body, the hinge is rotatable about an axis thereof, the hinge configured to axially expand along the axis from a contracted position to an expanded position when rotated in a first direction, and the hinge configured to axially contract along the axis from the expanded position to the contracted position when rotated in a second direction that is opposite to the first direction;

wherein in the contracted position the door body is in a closed position and in the expanded position the door body is in an open position; and

wherein in the open position mass of the door body and an outer door panel covering the door body is centered over the axis of the hinge to retain the door body in the open position, which is a raised position.

19. A door assembly for a vehicle, the door assembly comprising:

a door body;

a hinge connected to the door body, the hinge is rotatable about an axis thereof, the hinge configured to axially expand along the axis from a contracted position to an expanded position when rotated in a first direction, and the hinge configured to axially contract along the axis from the expanded position to the contracted position when rotated in a second direction that is opposite to the first direction, in the contracted position the door body is in a closed position and in the expanded position the door body is in an open position, the open position is a raised position and the closed position is a lowered position; and

a door support strut that supports the door body in the open position, the strut is arranged such that the strut is fully compressed when the door body is midway between the closed position and the open position.