Vehicle door check mechanism and vehicle door opening and closing apparatus having the same

1. A vehicle door check mechanism comprising:

a strap body to be mounted on a portion of a vehicle door adjacent to a rotation axis of the vehicle door,

wherein the strap body is configured to move with the vehicle door when the vehicle door swings around the rotation axis,

wherein the strap body is curved to have a predetermined curvature radius,

wherein a center of the curvature radius is located on the rotation axis of the vehicle door, and

wherein the strap body has a fixed end that is fixed to the vehicle door and a free end that is spaced apart from the vehicle door; and

a holder configured to hold the strap body at regular intervals.

2. The vehicle door check mechanism according to claim 1 , wherein:

the holder includes a first hold member and a second hold member disposed on both sides of the strap body;

the first hold member has a plurality of recesses spaced apart from each other in a longitudinal direction of the first hold member;

the second hold member has a plurality of recesses spaced apart from each other in a longitudinal direction of the second hold member; and

the strap body has a first projection configured to be selectively received in any one of the recesses of the first hold member, and a second projection configured to be selectively received in any one of the recesses of the second hold member.

3. The vehicle door check mechanism according to claim 2 , wherein:

the first hold member has a first cushion material contacting the first projection; and

the second hold member has a second cushion material contacting the second projection.

4. The vehicle door check mechanism according to claim 1 , wherein:

the holder includes a hold member located below the strap body;

the strap body has a roller rotatably mounted on the free end;

the hold member has a plurality of recesses;

the plurality of recesses are spaced apart from each other in a longitudinal direction of the hold member; and

the roller is configured to be selectively received in any one of the recesses.

5. The vehicle door check mechanism according to claim 1 , wherein:

the strap body has a plurality of recesses facing the rotation axis of the vehicle door; and

the holder includes a cam member having a projection configured to be selectively received in any one of the recesses of the strap body.

6. The vehicle door check mechanism according to claim 5 , wherein the cam member is configured to allow the projection of the cam member to be biased toward the recesses of the strap body by a biasing element.

7. The vehicle door check mechanism according to claim 6 , wherein:

the holder further includes a guide roller configured to guide a movement of the strap body; and

the guide roller is disposed to face the cam member.

8. The vehicle door check mechanism according to claim 1 , wherein:

the strap body has a plurality of inner peripheral recesses facing the rotation axis of the vehicle door, and a plurality of outer peripheral recesses opposing the plurality of inner peripheral recesses; and

the holder includes a first ball configured to be selectively received in any one of the outer peripheral recesses, and a second ball configured to be selectively received in any one of the inner peripheral recesses.

9. The vehicle door check mechanism according to claim 8 , further comprising a strap housing configured to guide a movement of the strap body, wherein the first ball and the second ball are mounted in the strap housing.

10. The vehicle door check mechanism according to claim 9 , wherein:

the first ball is supported by a first ball support;

the first ball support is elastically supported by a first elastic member;

the second ball is supported by a second ball support; and

the second ball support is elastically supported by a second elastic member.

11. The vehicle door check mechanism according to claim 1 , further comprising a guide member configured to guide a movement of the strap body.

12. A vehicle door check mechanism comprising:

a strap body to be mounted on a portion of a vehicle door adjacent to a rotation axis of the vehicle door, the strap body configured to move with the vehicle door as the vehicle door swings around the rotation axis, wherein the strap body is curved to have a predetermined curvature radius, a center of the curvature radius being located on the rotation axis of the vehicle door; and

a hold unit having a plurality of recesses spaced apart from each other, each recess configured to selectively receive a portion of the strap body.

13. The vehicle door check mechanism according to claim 12 , wherein:

the hold unit includes a first hold member and a second hold member disposed on opposite sides of the strap body;

the first hold member has ones of the recesses spaced apart from each other in a longitudinal direction of the first hold member;

the second hold member has ones of the recesses spaced apart from each other in a longitudinal direction of the second hold member; and

the strap body has a first projection configured to be selectively received in any one of the recesses of the first hold member and a second projection configured to be selectively received in any one of the recesses of the second hold member.

14. The vehicle door check mechanism according to claim 12 wherein:

the hold unit includes a hold member located below the strap body;

the strap body has a roller rotatably mounted on a free end;

the plurality of recesses are spaced apart from each other in a longitudinal direction of the hold member; and

the roller is configured to be selectively received in any one of the recesses.

15. A vehicle comprising:

a vehicle body;

a vehicle door;

a rail mounted on the vehicle body;

a roller unit mounted on the vehicle door, and configured to allow the vehicle door to open and close in one mode selected from a sliding mode and a swing mode, wherein in the sliding mode the vehicle door is configured to slide along the rail, and in the swing mode the vehicle door is configured to swing in a predetermined position of the rail; and

a vehicle door check mechanism disposed between the vehicle door and the roller unit, wherein the vehicle door check mechanism comprises:

a strap body mounted on a portion of the vehicle door adjacent to a rotation axis of the vehicle door, the strap body configured to move with the vehicle door as the vehicle door swings around the rotation axis, wherein the strap body is curved to have a predetermined curvature radius; and

a hold unit configured to allow the strap body to be held at regular intervals.

16. The vehicle according to claim 15 , wherein:

the roller unit includes a hold lock;

the roller unit is releasably held in the predetermined position of the rail by the hold lock;

the vehicle door is configured to swing around the rotation axis when the roller unit is held in the predetermined position of the rail by the hold lock; and

the vehicle door is configured to slide along the rail when the roller unit is released by the hold lock.

17. The vehicle according to claim 16 , wherein:

the roller unit includes a roller bracket having a roller configured to roll along the rail, and a body connecting the roller bracket and the vehicle door; and

the hold unit is mounted on the body of the roller unit.

18. The vehicle according to claim 15 , wherein:

a center of the curvature radius is located on the rotation axis of the vehicle door;

the strap body has a fixed end which is fixed to the vehicle door, and a free end which is spaced apart from the vehicle door;

the hold unit includes a first hold member and a second hold member disposed on both sides of the strap body;

the first hold member has multiple recesses spaced apart from each other in a longitudinal direction of the first hold member;

the second hold member has multiple recesses spaced apart from each other in a longitudinal direction of the second hold member;

the strap body has a first projection configured to be selectively received in any one of the multiple recesses of the first hold member, and a second projection configured to be selectively received in any one of the multiple recesses of the second hold member;

the first hold member has a first cushion material contacting the first projection; and

the second hold member has a second cushion material contacting the second projection.

19. The vehicle according to claim 15 , wherein:

a center of the curvature radius is located on the rotation axis of the vehicle door;

the strap body has a fixed end which is fixed to the vehicle door, and a free end which is spaced apart from the vehicle door;

the hold unit includes a hold member located below the strap body;

the strap body has a roller rotatably mounted on the free end;

the hold member has multiple recesses;

the multiple recesses are spaced apart from each other in a longitudinal direction of the hold member; and

the roller is configured to be selectively received in any one of the multiple recesses.