Air gap insulation with a cylinder liner

1. A cylinder liner for an internal combustion engine in which a piston can move between a lower and an upper dead center in an axial direction K, and the cylinder liner comprises: a thrust collar, by which the cylinder liner can be fixed in a housing of the internal combustion engine, and there is provided a recess at a cylinder head end, in which there is installed an insert ring with a height h R , wherein the thrust collar of the liner has a height h B which is between 65% and 100% of the height h R of the insert ring.

2. The cylinder liner per claim 1 , wherein an air gap insulation is provided between the insert ring and the cylinder liner, wherein at least one defined air gap is provided with an overall length l L , and a ratio between the height h R of the insert ring and the overall length l L is between 1.1 and 1.9.

3. The cylinder liner per claim 2 , wherein the air gap is configured as a cavity made in an outer circumference of the insert ring.

4. The cylinder liner per claim 3 , wherein three or more cavities are provided, being arranged one above the other in relation to the direction of motion K and with a spacing a from each other.

5. The cylinder liner per claim 3 , wherein the cavity has a height h V in relation to the axial direction of motion K, and a web is provided in front of and behind the cavity, limiting the height h V of the cavity.

6. The cylinder liner per claim 5 , wherein the ratio of the height h V of the cavity to the spacing a is between 1 and 7.

7. The cylinder liner according to claim 6 , wherein the ratio of the height h V of the cavity to the spacing a is between 3 and 6.

8. The cylinder liner per claim 2 , wherein the air gap is configured as a cavity made in an inner circumference of the recess.

9. The cylinder liner according to claim 8 , wherein the insert ring has a thickness d R and the cavity has a depth t V , while the ratio of the thickness d R to the depth t V is between 3 and 15.

10. The cylinder liner according to claim 9 , wherein the ratio of the thickness d R to the depth t V is between 7 and 13.

11. The cylinder liner per claim 8 , wherein three or more cavities are provided, being arranged one above the other in relation to the direction of motion K and with a spacing a from each other.

12. The cylinder liner per claim 8 , wherein the cavity has a height h V in relation to the axial direction of motion K, and a web is provided in front of and behind the cavity, limiting the height h V of the cavity.

13. The cylinder liner per claim 12 , wherein the ratio of the height h V of the cavity to the spacing a is between 1 and 7.

14. The cylinder liner according to claim 8 , wherein the insert ring has a thickness d R and the cavity has a depth t V , while the ratio of the thickness d R to the depth t V is between 3 and 15.

15. The cylinder liner according to claim 14 , wherein the ratio of the height h V of the cavity to the spacing a is between 3 and 6.

16. The cylinder liner according to claim 2 , wherein the ratio between the height h R of the insert ring and the overall length l L is between 1.3 and 1.7.

17. The cylinder liner according to claim 1 , wherein an additional insulating ring is provided as insulation.

18. The internal combustion engine with a cylinder liner according to claim 1 .

19. The cylinder liner according to claim 1 , wherein the height h B of the thrust collar of the liner is between 83% and 95% of the height h R of the insert ring.

20. The cylinder liner according to claim 19 , wherein the ratio of the thickness d R to the depth t V is between 7 and 13.