Filter element and filter system

Patent metadata

Field	Value
Publication number	US-11938434-B2
Application number	US-202016999402-A
Country	US
Kind code	B2
Filing date	Aug 21, 2020
Priority date	Feb 23, 2018
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A filter element has a filter bellows of filter medium laid into folds. The folds extend between oppositely positioned end edges of the filter bellows, respectively. The end edges form oppositely positioned end edge surfaces. The filter bellows is arranged in closed configuration about a longitudinal axis and encloses a hollow space. The filter bellows has opposed end faces sealed by an end disc. The filter bellows has a cut portion in at least one of the oppositely positioned end edge surfaces such that one or more regions of folds with shortened fold length are formed. A fold length of the folds with shortened fold length is substantially identical at an outer and inner circumference of the filter bellows. A filter system has a housing in which the filter element is arranged. One of the housing parts has a region corresponding to the cut portion of the filter bellows.

First claim

What is claimed is:

1. A filter element comprising:
a round filter bellows comprising a filter medium laid into folds along fold edges in the filter bellows,
wherein the folds extend axially relative to a longitudinal axis between axially oppositely positioned end edges of the filter bellows, respectively,
wherein the end edges form oppositely positioned end edge surfaces;
wherein the filter bellows is arranged in a closed configuration about the longitudinal axis and encloses a hollow space;
wherein the filter bellows comprises two axially opposed end faces sealed by an end disc, respectively;
wherein the filter bellows comprises
a cut portion in at least one of the oppositely positioned end edge surfaces such that the cut portion forms a shortened fold length region of folds having a shortened fold length,

wherein a fold length of the folds with shortened fold length is substantially identical at an outer circumference and at an inner circumference of the filter bellows,
wherein the shortened fold length folds have axial end edges at the cut portion that extend perpendicular to the longitudinal axis from the outer circumference to the inner circumference of the filter bellows.

2. The filter element according to claim 1 , wherein,
the shortened fold length folds have end edges at the cut portion which define and lie on a planar surface.

3. The filter element according to claim 2 , wherein
the cut portion is a cutout with a planar bottom and the cutout extends away from the at least one oppositely positioned end edge surface having the cut portion,
wherein the axial end edges of the folds with shortened fold length are positioned at the planar bottom forming the planar surface arranged perpendicular to the longitudinal axis.

4. The filter element according to claim 1 , wherein,
in one or more regions of folds with shortened fold length, the axial end edges of the folds with shortened fold length are positioned in a curved surface.

5. The filter element according to claim 2 , wherein
the cut portion is a concave cutout provided with the curved surface and the concave cutout extends away from the at least one oppositely positioned end edge surface,
wherein the axial end edges of the folds with shortened fold length are positioned in the curved surface of the concave cutout.

6. The filter element according to claim 1 , wherein
one or more shortened fold length region of folds having a shortened fold length and regions with folds with unshortened fold length follow each other alternatingly in the circumferential direction of the filter bellows.

7. The filter element according to claim 1 , wherein
the cut portion is a single cutout arranged within the medium in the filter bellows and forming the region with folds with shortened fold length.

8. The filter element according to claim 1 , wherein
the filter bellows comprises an annular cross section.

9. The filter element according to claim 1 , wherein
the filter bellows comprises an oval cross section.

10. The filter element according to claim 1 , wherein
the folds of the filter bellows are folded in a zigzag shape.

11. A filter system comprising:
a housing comprising
an inlet and an outlet for a fluid,

wherein the housing comprises
a first housing part and a second housing part;

the filter element according to claim 1 arranged in the housing,
wherein the filter element comprises
two opposed end faces sealed by an end disc, respectively;

wherein at least one of the first and second housing parts comprises
at least one region that is embodied corresponding to the cut portion of the filter bellows of the filter element.

12. The filter system according to claim 11 , further comprising
a support tube comprising
along a circumference thereof a constant axial extension,

wherein the filter element is arranged about the support tube.

13. The filter system according to claim 12 , wherein
the support tube is unshortened in one or more regions with folds with shortened fold length.

14. The filter system according to claim 11 , wherein
one of the end discs of the filter bellows is a closed end disc,
wherein the cut portion is arranged at an end of the filter element provided with the closed end disc.

15. The filter system according to claim 11 , wherein
one of the end discs of the filter bellows is an open end disc,
wherein the cut portion is arranged at an end of the filter element provided with the open end disc.

16. The filter system according to claim 11 , wherein
the first housing part is facing the cut portion of the filter bellows of the filter element,
wherein the first housing part comprises at least one bulge at an inner side of the first housing part,
wherein the at least one bulge forms said at least one region that is embodied corresponding to the cut portion of the filter bellows of the filter element,
wherein the cut portion comprises at least one cutout, and
wherein the at least one bulge engages the at least one cutout.

17. The filter system according to claim 11 , wherein
the first housing part comprises
an exterior recess which forms a corresponding interior bulge inside the first housing part,

wherein the housing further comprises
a closure element arranged in the exterior recess,
wherein the closure element dips substantially into the exterior recess in a closed state of the housing.

18. The filter system according to claim 17 , wherein
the closure element is a snap hook.

19. The filter system according to claim 11 , wherein
a separation plane between the first housing part and the second housing part is arranged substantially at an axial level of the cut portion in the filter bellows of the filter element.

20. The filter system according to claim 11 , configured as an air filter or a liquid filter for an internal combustion engine.

21. The filter system according to claim 11 , configured as a round filter for an internal combustion engine.

Assignees

• Mann & Hummel Gmbh

Inventors

• Neef Pascal

Classifications

• B01D46/2414 Primary

  End caps including additional functions or special forms · CPC title

• B01D29/21

  with corrugated, folded or wound sheets · CPC title

• B01D35/30

  Filter housing constructions · CPC title

• B01D46/521

  using folded, pleated material · CPC title

• B01D2201/291

  End caps · CPC title