Bellows having aerating means

1. A boot, comprising:

a first fastening region having a first diameter and a second fastening region having a second diameter;

wherein the first diameter is smaller than the second diameter;

wherein the first fastening region comprises a binder seat region on its outer circumference;

wherein at an inner circumference of the first fastening region at least one first and at least one second aerating protrusions are arranged axially spaced from each other at a flat surface of the inner circumference, and protrude beyond the flat surface of the inner circumference; and

wherein the flat surface of the inner circumference of the first fastening region includes a flat region axially between the at least one first and at least one second aerating protrusions, wherein the flat region has a sufficiently long axial width that the flat region is formable to have a bead-like material displacement against a surface of a first machine part when the first fastening region is fastened by fastening means between the axially spaced first and second aerating protrusions.

2. The boot of claim 1 , wherein the at least one first and the at least one second aerating protrusions are arranged facing each other in at least one pair on the flat surface of the inner circumference of the first fastening region.

3. The boot of claim 1 , wherein at least three first and at least three second aerating protrusions are provided, and are arranged uniformly on the flat surface of the inner circumference of the first fastening region.

4. The boot of claim 1 , wherein the first or the second aerating protrusions have an approximately elliptical shape according to a plan view.

5. The boot of claim 4 , wherein the boot has an annular shape defining a central axis, and a main axis of the one of the first or second aerating protrusions having an approximately elliptical shape is aligned in an approximately coaxial manner relative to the central axis of the boot.

6. The boot of claim 1 , wherein the at least one first or the at least one second aerating protrusions are integral with the first fastening region.

7. The boot of claim 1 , wherein the at least one first or the at least one second aerating protrusions are arranged at least partly below at least one first or at least one second ear-shaped protrusions on the flat surface of the inner circumference of the first fastening region.

8. The boot of claim 1 , wherein one surface of the first binder seat region is formed approximately parallel to the flat surface of the inner circumference of the first fastening region.

9. A method for attaching a boot to a first machine part, wherein the boot includes a first fastening region having a first diameter and a second fastening region having a second diameter; wherein the first diameter is smaller than the second diameter;

wherein the first fastening region comprises a binder seat region on its outer circumference; and wherein at an inner circumference of the first fastening region at least one first and at least one second aerating protrusions are arranged axially spaced from each other at a flat surface of the inner circumference, and protrude beyond the flat surface of the inner circumference; the method comprising:

attaching the first fastening region having the first diameter on the first machine part by means of a fastening means such that, while disposing the fastening means at least in subareas between the flat surface of the inner circumference of the first fastening region and a surface of the first machine part, a passage opening is provided;

wherein, through fastening the first fastening region by means of the fastening means between the axially spaced first and second aerating protrusions, a region having a bead-like material displacement is formed, which is in contact with the surface of the first machine part.

10. The method of claim 9 , wherein the first fastening region is widened for arranging the first machine part therein.

11. The method of claim 9 , wherein the first fastening region is widened for disposing the first machine part therein, such that the passage opening is provided at least in subareas between the flat surface of the inner circumference of the first fastening region and a surface of the first machine part.

12. The method of claim 9 , further comprising, before attaching the boot to the first machine part, attaching the boot with its second fastening region having the second, larger diameter to a second machine part.

13. The method of claim 9 , wherein the first machine part is a joint shaft.

14. A boot assembly, comprising:

a first machine part having a first surface;

a boot including a first fastening region having a first diameter and a second fastening region having a second diameter; and

fastening means;

wherein the first diameter is smaller than the second diameter;

wherein the first fastening region comprises a binder seat region on its outer circumference; and

wherein at an inner circumference of the first fastening region, at least one first and at least one second aerating protrusions are arranged axially spaced from each other at a flat surface of the inner circumference, and protrude beyond the flat surface of the inner circumference;

wherein the fastening means fasten the first fastening region between the axially spaced first and second aerating protrusions, forming a region having a bead-like material displacement that is in contact with the surface of the first machine part.