Seat lock structure for saddle riding vehicle

1. A seat lock structure for a saddle riding vehicle, comprising:

a seat on which a rider or a passenger sits;

a key cylinder; and

a seat lock mechanism to open and close the seat by a key operation of the key cylinder, wherein

the key cylinder includes a turning arm which is turnable by a key operation only when a key is inserted into the key cylinder,

the seat lock mechanism includes a first bracket which is fixed to a vehicle body frame, and a second bracket which is slidably supported on the first bracket and engageable with a seat side,

the second bracket is integrally provided with an extension portion main body which is disposed on one side in a sliding direction of the second bracket at a distal end portion of the turning arm, and with a slide regulating portion which is disposed on another side in the sliding direction,

the extension portion main body and the slide regulating portion are formed in a U-shape, are disposed along the distal end portion of the turning arm to surround the distal end portion, and are disposed at a distance from a turning center of the turning arm in a slide orthogonal direction which is orthogonal to the sliding direction of the second bracket,

the extension portion main body and the slide regulating portion constitute an engagement portion,

the turning arm extends along the engagement portion,

the second bracket is slid in the sliding direction when the extension portion main body is pressed by the turning arm, and the slide regulating portion regulates the second bracket from being slid in the sliding direction when the key is not inserted into the key cylinder, and

when the key is extracted from the key cylinder after the seat is opened, the slide regulating portion holds a turning position of the turning arm to maintain the seat in an open state, and when the key is extracted from the key cylinder with the seat closed, the slide regulating portion holds the turning position of the turning arm to lock the seat.

2. The seat lock structure for a saddle riding vehicle according to claim 1 , wherein an article storage part for storing articles is formed below the seat, and the seat lock mechanism is provided in the article storage part.

3. The seat lock structure for a saddle riding vehicle according to claim 2 , wherein the article storage part spreads downward and rearward of the seat lock mechanism.

4. The seat lock structure for a saddle riding vehicle according to claim 1 , wherein the key cylinder and the seat lock mechanism are disposed so as to be at least partially overlapped with each other in a forward-rearward direction.

5. The seat lock structure for a saddle riding vehicle according to claim 1 , wherein the slide regulating portion is disposed below the key cylinder.

6. The seat lock structure for a saddle riding vehicle according to claim 1 , wherein a striker is provided at a lower portion of the seat, a slit into which the striker is inserted is formed in the first bracket, and a locking pawl which is disposed close to one side of the slit and is engageable with the striker inserted into the slit is formed in the second bracket, so that the locking pawl is disposed between the key cylinder and the slit.

7. The seat lock structure for a saddle riding vehicle according to claim 2 , wherein the key cylinder and the seat lock mechanism are disposed so as to be at least partially overlapped with each other in a forward-rearward direction.

8. The seat lock structure for a saddle riding vehicle according to claim 3 , wherein the key cylinder and the seat lock mechanism are disposed so as to be at least partially overlapped with each other in a forward-rearward direction.

9. The seat lock structure for a saddle riding vehicle according to claim 2 , wherein the slide regulating portion is disposed below the key cylinder.

10. The seat lock structure for a saddle riding vehicle according to claim 3 , wherein the slide regulating portion is disposed below the key cylinder.

11. The seat lock structure for a saddle riding vehicle according to claim 4 , wherein the slide regulating portion is disposed below the key cylinder.

12. The seat lock structure for a saddle riding vehicle according to claim 2 , wherein a striker is provided at a lower portion of the seat, a slit into which the striker is inserted is formed in the first bracket, and a locking pawl which is disposed close to one side of the slit and is engageable with the striker inserted into the slit is formed in the second bracket, so that the locking pawl is disposed between the key cylinder and the slit.

13. The seat lock structure for a saddle riding vehicle according to claim 3 , wherein a striker is provided at a lower portion of the seat, a slit into which the striker is inserted is formed in the first bracket, and a locking pawl which is disposed close to one side of the slit and is engageable with the striker inserted into the slit is formed in the second bracket, so that the locking pawl is disposed between the key cylinder and the slit.

14. The seat lock structure for a saddle riding vehicle according to claim 4 , wherein a striker is provided at a lower portion of the seat, a slit into which the striker is inserted is formed in the first bracket, and a locking pawl which is disposed close to one side of the slit and is engageable with the striker inserted into the slit is formed in the second bracket, so that the locking pawl is disposed between the key cylinder and the slit.

15. The seat lock structure for a saddle riding vehicle according to claim 5 , wherein a striker is provided at a lower portion of the seat, a slit into which the striker is inserted is formed in the first bracket, and a locking pawl which is disposed close to one side of the slit and is engageable with the striker inserted into the slit is formed in the second bracket, so that the locking pawl is disposed between the key cylinder and the slit.