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A metal cellular wheel (10) for a pressure wave supercharger comprising an outer sleeve (12) arranged coaxial to a rotational axis (y), an inner sleeve (14) arranged coaxial to the outer sleeve (12), and at least one intermediate sleeve (18) arranged between and coaxial to the outer sleeve (12) and

A metal cellular wheel (10) for a pressure wave supercharger comprising an outer sleeve (12) arranged coaxial to a rotational axis (y), an inner sleeve (14) arranged coaxial to the outer sleeve (12), and at least one intermediate sleeve (18) arranged between and coaxial to the outer sleeve (12) and the inner sleeve (14). Fins (16) are arranged between successive sleeves (12, 18; 18, 14), aligned radially to axis (y), and joined to adjacent sleeves (12, 18; 18, 14). On outer sleeve (12), outer sealing sleeves (24) engage over the outer sleeve (12), are joined with the outer sleeve (12), and have a sealing profile (30) for a labyrinth seal. A drive shaft (13) along axis (y) is joined with the inner sleeve (14), and the intermediate sleeve(s) (18) has (have) notches (26) extending, between adjacent fins (16), from both end faces (11) of the cellular wheel (10).

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1. A cellular wheel made of metal, comprising an outer sleeve arranged coaxial to a rotational axis,an inner sleeve arranged coaxial to the outer sleeve,at least one intermediate sleeve arranged between and coaxial to the outer sleeve and the inner sleeve,fins that are arranged between successive sl

1. A cellular wheel made of metal, comprising an outer sleeve arranged coaxial to a rotational axis,an inner sleeve arranged coaxial to the outer sleeve,at least one intermediate sleeve arranged between and coaxial to the outer sleeve and the inner sleeve,fins that are arranged between successive sleeves and are aligned substantially radially with regard to the rotational axis and joined with adjacent sleeves,outer sealing sleeves that engage over the outer sleeve and are joined with the outer sleeve and have a sealing profile for a labyrinth seal, anda drive shaft that lies in the rotational axis,wherein the cellular wheel has two end faces; andwherein at least the outer sleeve, the inner sleeve and/or the intermediate sleeve or at least one of the intermediate sleeves have notches extending, between adjacent fins, from both end faces of the cellular wheel. 2. The cellular wheel according to claim 1, wherein the notches end in recesses. 3. The cellular wheel according to claim 2, wherein the recesses have a dimension of 1 to 2 mm. 4. The cellular wheel according to claim 1, wherein in each case two adjacent notches form an edge strip associated with the respective sleeve, wherein a single edge strip is allocated in each case a single fin. 5. The cellular wheel according to claim 1, wherein the inner sleeve is located on a flange sleeve that is arranged coaxially to said inner sleeve and is joined with the drive shaft, and the outer sleeve has notches extending, between adjacent fins, from both end faces of the cellular wheel, wherein a marginal edge of the outer sealing sleeves, which marginal edge is located remote from the end faces of the cellular wheel, protrudes the notches by an amount, and the outer sealing sleeves are joined with the outer sleeve only in the region protruding the notches. 6. The cellular wheel according to claim 5, wherein the inner sleeve has notches extending, between adjacent fins, from both end faces of the cellular wheel, and the inner sleeve is joined with the flange sleeve between adjacent fins between notches located opposite to each other. 7. The cellular wheel according to claim 1, wherein the sealing profile of the outer sealing sleeves has a sealing surface that is aligned with the end faces of the cellular wheel, and the outer sealing sleeves form with the outer sleeve an annular gap that is open at the end faces of the cellular wheel. 8. The cellular wheel according to claim 1, wherein the inner sleeve is joined with the drive shaft, and the intermediate sleeve(s) has (have) notches extending, between adjacent fins, from both end faces of the cellular wheel. 9. The cellular wheel according to claim 1, wherein the sealing profile of the outer sealing sleeves has a sealing surface that is aligned with the end faces of the cellular wheel, and in the inner sleeve, inner sealing sleeves joined with the inner sleeve are arranged, which inner sealing sleeves have a sealing profile with a sealing surface that is aligned with the end faces of the cellular wheel for forming a labyrinth seal. 10. The cellular wheel according to claim 9, wherein the outer and inner sealing sleeves are joined with the outer and inner sleeves, respectively, only in a region of an end located remote from the end faces of the cellular wheel, and form with the outer and inner sleeves, respectively, an annular gap that is open at the end faces of the cellular wheel. 11. The cellular wheel according to 10, wherein a volume of the annular gap is increased by a wall thickness of the outer and inner sealing sleeves that is reduced in the region of the annular gap; or wherein a volume of the annular gap is increased by a wall thickness of the outer and inner sleeves respectively, that is reduced in the region of the annular gap. 12. The cellular wheel according to claim 10, wherein for stabilizing the annular gap, spacer elements that are arranged distributed over the circumference of the outer and inner sealing sleeves protrude in the region of the end faces of the cellular wheel from that side of the outer and inner sealing sleeves that faces toward the outer and inner sleeves, respectively. 13. The cellular wheel according to claim 10, wherein for stabilizing the annular gap, spacer elements that are arranged distributed over the circumference of the outer and inner sleeves, respectively, protrude in the region of the end faces of the cellular wheel from that side of the outer and inner sleeves, respectively, that faces toward the outer and inner sealing sleeves. 14. The cellular wheel according to claim 9, wherein an end of the inner sealing sleeves, which end is located remote from the end faces of the cellular wheel, is joined with an annular web, and/or wherein an inner sealing sleeve at an end face of the cellular wheel is joined with a cover, and/or wherein an annular web is joined with a cover. 15. The cellular wheel according to claim 1, wherein the length of the notches is 10% to 30% of the length of the cellular wheel; and/or wherein the outer sleeve, the inner sleeve, the intermediate sleeve(s), the fins and the sealing sleeves are made from sheet metal having a thickness of less than 0.5 mm. 16. The cellular wheel according to claim 1, wherein the drive shaft has two annular webs which are arranged coaxial to the drive shaft and spaced apart from one another and which have a circumferential surface as support surfaces for the inner sleeve, and at least one of the annular webs is joined with the inner sleeve. 17. The cellular wheel according to claim 1, wherein the drive shaft is configured as a hollow shaft having a tubular end part, a conical intermediate part and a tubular shaft part with a receptacle for a coupling piece to be connected to a motor drive. 18. The cellular wheel according to claim 17, wherein the tubular end part and the conical intermediate part have openings that are arranged symmetrically over the circumference, and/or wherein the coupling piece has a coupling axle with longitudinal ribs which, when sliding the coupling piece into the receptacle of the tubular shaft part, engage in longitudinal grooves in the receptacle. 19. A use of a cellular wheel according to claim 1, in a pressure wave supercharger for supercharging internal combustion engines or Otto engines. 20. A cellular wheel made of metal, comprising an outer sleeve arranged coaxial to a rotational axis,an inner sleeve arranged coaxial to the outer sleeve,at least one intermediate sleeve arranged between and coaxial to the outer sleeve and the inner sleeve,fins that are arranged between successive sleeves and are aligned substantially radially with regard to the rotational axis and joined with adjacent sleeves,outer sealing sleeves that engage over the outer sleeve and are joined with the outer sleeve and have a sealing profile for a labyrinth seal, anda drive shaft that lies in the rotational axis,wherein the cellular wheel has two end faces; andwherein solely the intermediate sleeve or solely at least one of the intermediate sleeves has notches extending between adjacent fins, from the two end faces of the cellular wheel. 21. The cellular wheel according to claim 20, wherein the notches end in recesses. 22. The cellular wheel according to claim 20, wherein in each case two adjacent notches form an edge strip associated with the respective sleeve, wherein a single edge strip is allocated in each case a single fin. 23. The cellular wheel according to claim 22, wherein the recesses have a dimension of 1 to 2 mm. 24. The cellular wheel according to claim 20, wherein the inner sleeve is located on a flange sleeve that is arranged coaxially to said inner sleeve and is joined with the drive shaft, and the outer sleeve has notches extending, between adjacent fins, from both end faces of the cellular wheel, wherein a marginal edge of the outer sealing sleeves, which marginal edge is located remote from the end faces of the cellular wheel, protrudes the notches by an amount, and the outer sealing sleeves are joined with the outer sleeve only in the region protruding the notches. 25. The cellular wheel according to claim 24, wherein the inner sleeve has notches extending, between adjacent fins, from both end faces of the cellular wheel, and the inner sleeve is joined with the flange sleeve between adjacent fins between notches located opposite to each other. 26. The cellular wheel according to claim 20, wherein the sealing profile of the outer sealing sleeves has a sealing surface that is aligned with the end faces of the cellular wheel, and the outer sealing sleeves form with the outer sleeve an annular gap that is open at the end faces of the cellular wheel. 27. The cellular wheel according to claim 20, wherein the inner sleeve is joined with the drive shaft, and the intermediate sleeve(s) has (have) notches extending, between adjacent fins, from both end faces of the cellular wheel. 28. The cellular wheel according to claim 20, wherein the sealing profile of the outer sealing sleeves has a sealing surface that is aligned with the end faces of the cellular wheel, and in the inner sleeve, inner sealing sleeves joined with the inner sleeve are arranged, which inner sealing sleeves have a sealing profile with a sealing surface that is aligned with the end faces of the cellular wheel for forming a labyrinth seal. 29. The cellular wheel according to claim 28, wherein the outer and inner sealing sleeves are joined with the outer and inner sleeves, respectively, only in a region of an end located remote from the end faces of the cellular wheel, and form with the outer and inner sleeves, respectively, an annular gap that is open at the end faces of the cellular wheel. 30. The cellular wheel according to 29, wherein a volume of the annular gap is increased by a wall thickness of the outer and inner sealing sleeves that is reduced in the region of the annular gap; or wherein a volume of the annular gap is increased by a wall thickness of the outer and inner sleeves respectively, that is reduced in the region of the annular gap. 31. The cellular wheel according to claim 29, wherein for stabilizing the annular gap, spacer elements that are arranged distributed over the circumference of the outer and inner sealing sleeves protrude in the region of the end faces of the cellular wheel from that side of the outer and inner sealing sleeves that faces toward the outer and inner sleeves, respectively. 32. The cellular wheel according to claim 29, wherein for stabilizing the annular gap, spacer elements that are arranged distributed over the circumference of the outer and inner sleeves, respectively, protrude in the region of the end faces of the cellular wheel from that side of the outer and inner sleeves, respectively, that faces toward the outer and inner sealing sleeves. 33. The cellular wheel according to claim 20, wherein the length of the notches is 10% to 30% of the length of the cellular wheel; and/or wherein the outer sleeve, the inner sleeve, the intermediate sleeve(s), the fins and the sealing sleeves are made from sheet metal having a thickness of less than 0.5 mm. 34. The cellular wheel according to claim 20, wherein the drive shaft has two annular webs which are arranged coaxial to the drive shaft and spaced apart from one another and which have a circumferential surface as support surfaces for the inner sleeve, and at least one of the annular webs is joined with the inner sleeve. 35. The cellular wheel according to claim 34, wherein an end of inner sealing sleeves, which end is located remote from the end faces of the cellular wheel, is joined with an annular web, and/or wherein an inner sealing sleeve at an end face of the cellular wheel is joined with a cover, and/or wherein an annular web is joined with a cover. 36. The cellular wheel according to claim 20, wherein the drive shaft is configured as a hollow shaft having a tubular end part, a conical intermediate part and a tubular shaft part with a receptacle for a coupling piece to be connected to a motor drive. 37. The cellular wheel according to claim 36, wherein the tubular end part and the conical intermediate part have openings that are arranged symmetrically over the circumference, and/or wherein the coupling piece has a coupling axle with longitudinal ribs which, when sliding the coupling piece into the receptacle of the tubular shaft part, engage in longitudinal grooves in the receptacle. 38. A use of a cellular wheel according to claim 20, in a pressure wave supercharger for supercharging internal combustion engines, in particular of or Otto engines.