Pneumatic tire with reinforcing part

1. A pneumatic tire configured to be mounted on a tire wheel, the pneumatic tire comprising:

a tread having a groove that is formed in a circumferential direction of the tire wheel as being recessed toward a central axis of the pneumatic tire, and a kerf that is formed to intersect the groove as being recessed toward the central axis of the pneumatic tire; and

a reinforcing part configured to be inserted into the groove,

wherein the reinforcing part is bent one or more times and has discontinuous change in cross-sectional area thereof, which inhibits an air column having a uniform cross section from being formed at the tread during rotation of the pneumatic tire and prevents an occurrence of pipe resonance due to the air column,

wherein the reinforcing part has an SS rib, an M rib, an LL rib, an S rib, and an L rib, each extending by a predetermined length in opposite directions from both ends of a right-angled ‘C’ shape, and

wherein the SS rib, the M rib, the LL rib, the S rib, and the L rib are different from each other in size and are connected to each other in series.

2. The pneumatic tire with a reinforcing part according to claim 1 ,

wherein the SS rib, the M rib, the LL rib, the S rib, and the L rib alternately project to be opposite to each other with a central reference axis.

3. The pneumatic tire according to claim 2 ,

wherein the SS rib includes, when the central reference axis is defined along the circumferential direction of the tire wheel:

a first SS rib which has at least one portion positioned on a same straight line as the central reference axis and is bent at an angle of 90° once;

a second SS rib which extends from one end of the first SS rib and is parallel to the central reference axis; and

a third SS rib which has at least one portion positioned on the same straight line as the central reference axis, is bent at an angle of 90° once, and is connected to one end of the second SS rib,

wherein the first SS rib and the third SS rib have a same shape, and

wherein the at least one portion of the first SS rib and the at least one portion of the third SS rib extend outward to be opposite to each other.

4. The pneumatic tire according to claim 3 ,

wherein the M rib includes:

a first M rib which has at least one portion positioned on the same straight line as the central reference axis and is bent at an angle of 90° once;

a second M rib which extends from one end of the first M rib and is parallel to the central reference axis; and

a third M rib which has at least one portion positioned on the same straight line as the central reference axis, is bent at an angle of 90° once, and is connected to one end of the second M rib,

wherein the first M rib and the third M rib have the same shape, and

wherein the at least one portion of the first M rib and the at least one portion of the third M rib extend outward to be opposite to each other.

5. The pneumatic tire according to claim 4 ,

wherein the LL rib includes:

a first LL rib which has at least one portion positioned on the same straight line as the central reference axis and is bent at an angle of 90° once;

a second LL rib which extends from one end of the first LL rib and is parallel to the central reference axis; and

a third LL rib which has at least one portion positioned on the same straight line as the central reference axis, is bent at an angle of 90° once, and is connected to one end of the second LL rib,

wherein the first LL rib and the third LL rib have the same shape, and

wherein the at least one portion of the first LL rib and the at least one portion of the third LL rib extend outward to be opposite to each other.

6. The pneumatic tire according to claim 5 ,

wherein the S rib includes:

a first S rib which has at least one portion positioned on the same straight line as the central reference axis and is bent at an angle of 90° once;

a second S rib which extends from one end of the first S rib and is parallel to the central reference axis; and

a third S rib which has at least one portion positioned on the same straight line as the central reference axis, is bent at an angle of 90° once, and is connected to one end of the second S rib,

wherein the first S rib and the third S rib have the same shape, and

wherein the at least one portion of the first S rib and the at least one portion of the third S rib extend outward to be opposite to each other.

7. The pneumatic tire according to claim 6 ,

wherein the L rib includes:

a first L rib which has at least one portion positioned on the same straight line as the central reference axis and is bent at an angle of 90° once;

a second L rib which extends from one end of the first L rib and is parallel to the central reference axis; and

a third L rib which has at least one portion positioned on the same straight line as the central reference axis, is bent at an angle of 90° once, and is connected to one end of the second L rib,

wherein the first L rib and the third L rib have the same shape, and

wherein the at least one portion of the first L rib and the at least one portion of the third L rib extend outward to be opposite to each other.

8. The pneumatic tire according to claim 3 ,

wherein a pitch length (Lp) representing the shortest distance between both ends of the SS rib is 25 mm,

wherein a width (W) representing a length perpendicular to at least the one portion of the SS rib is 2 mm, and

wherein a ratio (H/Lp) obtained by dividing a length (H) of the second SS rib by the pitch length (Lp) is 58%.

9. The pneumatic tire according to claim 4 ,

wherein a pitch length (Lp) representing the shortest distance between both ends of the M rib is 31.825 mm,

wherein a width (W) representing a length perpendicular to at least the one portion of the M rib is 3 mm, and

wherein a ratio (H/Lp) obtained by dividing a length (H) of the second M rib by the pitch length (Lp) is 54%.

10. The pneumatic tire according to claim 5 ,

wherein a pitch length (Lp) representing the shortest distance between both ends of the LL rib is 40.5 mm,

wherein a width (W) representing a length perpendicular to at least the one portion of the LL rib is 4 mm, and

wherein a ratio (H/Lp) obtained by dividing a length (H) of the second LL rib by the pitch length (Lp) is 50%.

11. The pneumatic tire according to claim 6 ,

wherein a pitch length (Lp) representing the shortest distance between both ends of the S rib is 28.25 mm,

wherein a width (W) representing a length perpendicular to at least the one portion of the S rib is 2 mm, and

wherein a ratio (H/Lp) obtained by dividing a length (H) of the second S rib by the pitch length (Lp) is 56%.

12. The pneumatic tire according to claim 7 ,

wherein a pitch length (Lp) representing the shortest distance between both ends of the L rib is 35.925 mm,

wherein a width (W) representing a length perpendicular to at least the one portion of the L rib is 3 mm, and

wherein a ratio (H/Lp) obtained by dividing a length (H) of the second L rib by the pitch length (Lp) is 52%.