Air Cleaner Assembly for an Internal Combustion Engine

Abstract

An air cleaner assembly (100) for an internal combustion engine, has a housing (10) with at least one intake air inlet and at least one intake air outlet (14) formed in the housing wall (18) for supplying an intake air to the internal combustion engine, at least one filter element disposed within the housing (10) for filtering the intake air, separating a rough air side from a clean air side inside the housing (10), and at least one flow straightener insert (20) comprising a body structure (40) with a hydrocarbon absorbing medium (30) disposed at the clean air side of the filter element. The at least one outlet (14) accommodates the at least one flow straightener insert (20).

Claims

1. An air cleaner assembly for an internal combustion engine, comprising: a housing with at least one intake air inlet and at least one intake air outlet formed in the housing wall for supplying an intake air to the internal combustion engine, at least one filter element disposed within the housing for filtering the intake air, separating a rough air side from a clean air side inside the housing, at least one flow straightener insert comprising a body structure with a hydrocarbon absorbing medium disposed at the clean air side of the filter element, wherein the at least one outlet accommodates the at least one flow straightener insert.

2. The air cleaner assembly according to claim 1, wherein the hydrocarbon absorbing medium is arranged at least partially surrounding the body structure of the flow straightener insert on an outer surface, providing a gap in the hydrocarbon absorbing medium.

3. The air cleaner assembly according to claim 2, wherein the hydrocarbon absorbing medium is at least partially enclosing an opening in the body structure for positioning of a mass air flow sensor in the opening.

4. The air cleaner assembly according to claim 1, wherein the hydrocarbon absorbing medium is fastened to the body structure of the flow straightener insert, wherein the hydrocarbon absorbing medium is fastened along at least one welding line.

5. The air cleaner assembly according to claim 1, wherein the hydrocarbon absorbing medium comprises a zeolite material.

6. The air cleaner assembly according to claim 1, wherein the body structure of the flow straightener insert comprises at least one arcuate member and one or more V-shaped members, both having longitudinal axes, wherein the longitudinal axes of the at least one arcuate member and the V-shaped members are arranged in parallel to a longitudinal axis of an outlet tube.

7. The air cleaner assembly according to claim 6, wherein the V-shaped members are arranged in a star-shaped manner inside the flow straightener insert about a longitudinal axis of the body structure of the flow straightener insert.

8. The air cleaner assembly according to claim 6, wherein the V-shaped members comprise vanes being fixed to the body structure of the flow straightener insert, wherein the at least one arcuate member is extending between vane sections being fixed to the body structure.

9. The air cleaner assembly according to claim 8, wherein the at least one arcuate member comprises at least one arcuate section extending between vane sections being fixed to the body structure of the flow straightener insert.

10. The air cleaner assembly according to claim 6, wherein adjacent vanes and vane sections of the V-shaped members and the at least one arcuate member, respectively, are separated by a spacing in radial direction.

11. The air cleaner assembly according to claim 6, wherein an opening is provided in the body structure of the flow straightener insert for positioning of a mass air flow sensor, extending inside the body structure of the flow straightener insert, the opening being arranged congruently to an opening in the outlet tube of the at least one outlet for positioning the mass flow sensor with the flow straightener insert being mounted inside the outlet.

12. The air cleaner assembly according to claim 6, wherein the arcuate member is arranged inside the body structure opposite to the opening for the mass air flow sensor.

13. The air cleaner assembly according to claim 1, wherein the flow straightener insert is fastened to or welded to the at least one outlet.

14. The air cleaner assembly according to claim 1, wherein the body structure of the flow straightener insert is provided with an alignment locator for positioning the flow straightener insert inside the outlet.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention together with the above-mentioned and other objects and advantages may best be understood from the following detailed description of the embodiments, but not restricted to the embodiments, wherein is shown in:

[0028] FIG. 1 an isometric exploded view of an air cleaner assembly according to an example embodiment of the invention, depicting an outlet tube of a housing with a flow straightener insert;

[0029] FIG. 2 an isometric view of the flow straightener insert of FIG. 1 mounted in the outlet tube;

[0030] FIG. 3 an isometric view of the flow straightener insert of FIG. 1 covered with a hydrocarbon absorbing medium;

[0031] FIG. 4 a front view of the air cleaner assembly with the flow straightener insert mounted in the outlet tube; and

[0032] FIG. 5 a longitudinal sectional view of the outlet tube with the flow straightener insert and the mass flow sensor mounted.

DETAILED DESCRIPTION OF THE DRAWINGS

[0033] In the drawings, like elements are referred to with equal reference numerals. The drawings are merely schematic representations, not intended to portray specific parameters of the invention. Moreover, the drawings are intended to depict only typical embodiments of the invention and therefore should not be considered as limiting the scope of the invention.

[0034] FIG. 1 depicts an isometric exploded view of an air cleaner assembly 100 according to an example embodiment of the invention, depicting an outlet tube 52 of the housing 10 with a flow straightener insert 20, whereas in FIG. 2 an isometric view of the flow straightener insert 20 of FIG. 1 mounted in the outlet tube 52 is shown.

[0035] The air cleaner assembly 100 for an internal combustion engine, as shown in the exploded view in FIG. 1, comprises a housing 10 with at least one intake air inlet (not shown in the Figure) and at least one intake air outlet 14 formed in the housing wall 18 for supplying an intake air to the internal combustion engine. The housing 10 is only shown as a part of the housing 10, focusing on the outlet 14.

[0036] The air cleaner assembly 100 comprises at least one filter element (not shown) disposed within the housing 10 for filtering the intake air, separating a rough air side from a clean air side inside the housing 10. The filter element is not depicted in the Figures. The air cleaner assembly 100 further comprises a flow straightener insert 20 disposed at the clean air side of the filter element, the flow straightener insert 20 comprising a body structure 40 with a hydrocarbon absorbing medium 30 arranged at the outer perimeter of the flow straightener insert 20. The outlet 14 of the air cleaner assembly 100 is provided for accommodating the flow straightener insert 20.

[0037] The hydrocarbon absorbing medium 30 is arranged at least partially surrounding the body structure 40 of the flow straightener insert 20 on an outer surface 28, providing a gap 32 in the hydrocarbon absorbing medium 30. The hydrocarbon absorbing medium 30 has a cylindrically shaped body as shown in FIG. 1.

[0038] The hydrocarbon absorbing medium 30 for absorbing hydrocarbons like fuel emissions may comprise or be composed of a zeolite material.

[0039] FIG. 2 exhibits the flow straightener insert 20 mounted in the outlet tube 52 of the outlet 14 of the housing 10 of the air cleaner assembly 100. The outlet tube 52 has a longitudinal axis 56. A mass air flow sensor 46 is extending through an opening 16 in the wall of the outlet tube 52 and the opening 34 of the body structure 40 of the flow straightener insert 20 into the body structure 40 and extends to the center of the body structure 40. The air flow through the flow straightener insert 20 is depicted as an arrow 50. For simplicity reasons, the general direction of the air flow 50 is considered predominantly in parallel to the longitudinal axis 56 of the outlet tube 52.

[0040] The flow straightener insert 20 is fastened, in particular welded, to the at least one outlet 14.

[0041] FIG. 3 depicts an isometric view of the flow straightener insert 20 of FIG. 1, whereas in FIG. 4 a cross sectional view of the air cleaner assembly 20 through the outlet tube 52 with the flow straightener insert 20 mounted in the tube 52 and in FIG. 5 a longitudinal sectional view hereof is shown. The flow straightener insert 20 is depicted in FIG. 3 in more detail. The body structure 40 of the flow straightener insert 20 comprises in this embodiment one arcuate member 22 having a longitudinal axis 23 and two V-shaped members 24, having longitudinal axes 25, as illustrated in FIG. 3. The body structure 40 has a longitudinal axis 41. The longitudinal axes 23, 25 of the arcuate and V-shaped members 22, 24 are arranged in parallel to the longitudinal axis 56 of the outlet tube 52 which is in the mounted state generally in parallel to the air flow direction 50. The V-shaped members 24 are arranged in a star-shaped manner inside the flow straightener insert 20 about the longitudinal axis 41 of the body structure 40 of the flow straightener insert 20.

[0042] Each of the V-shaped members 24 comprises two vanes 26 connected to each other in the middle of the V-shaped member 24. The vanes are fixed to the body structure 40 of the flow straightener insert 20. At least one arcuate member 22 is provided which has predominantly an M-shaped body, having a arcuate section 21 extending between vane sections 27, the vane sections 27 being fixed to the body structure 40.

[0043] Adjacent vanes 26 and vane sections 27 of the V-shaped members 24 and the arcuate members 22, respectively, are separated by a spacing 36 in circumferential direction, as shown in FIG. 3.

[0044] An opening 34 is provided in the body structure 40 of the flow straightener insert 20 for positioning of a mass air flow sensor 46, extending inside the body structure 40 of the flow straightener insert 20. The opening 34 is arranged congruently to an opening 16 in a tube 52 of the at least one outlet 14. The opening 34 accommodates the mass flow sensor 46 with the flow straightener insert 20 being mounted inside the outlet 14.

[0045] The body structure 40 of the flow straightener insert 20 is provided with an alignment locator 38 for positioning the flow straightener insert 20 inside the outlet 14 in a reproducible manner.

[0046] The arcuate member 22 is arranged inside the body structure 40 opposite to the opening 34. In particular, the arcuate section 21 is located opposite to the opening 34, thus leaving free space for accommodating the mass air flow sensor 46.

[0047] The hydrocarbon absorbing medium 30 at least partially encloses the opening 34 in the body structure 40 for positioning of the mass air flow sensor 46 in the opening 34. The hydrocarbon absorbing medium 30 is fastened to the body structure 40 of the flow straightener insert 20, in particular by two welding lines 42 at both ends enclosing the opening 34 on two opposing sides of the hydrocarbon absorbing medium 30.

[0048] FIG. 4 depicts a front view of the air cleaner assembly 20 seen through the outlet tube 52 with the flow straightener insert 20 mounted in the tube 52. The star-shaped configuration of the V-shaped members 24 and the arcuate member 22 opposing the opening 34 for the mass air flow sensor 46 can be clearly seen in their mutual arrangement. The mass air flow sensor 46 extends in its mounted position with its sensing element near to the center of the body structure 40. The sensing element is accessible through an opening 48 inside the mass air flow sensor 46 The arcuate section 21 of the arcuate member 22 is facing the mass air flow sensor 46 and is concave-shaped providing a recess for the sensing element. Thus, the arcuate member 22 leaves enough free space for supporting favorable flow conditions for the air flow around the opening 48 of the mass air flow sensor 46.

[0049] In FIG. 5 a longitudinal sectional view through the outlet tube 52 of the air cleaner assembly 20 is shown. The flow straightener insert 20 is mounted in the outlet tube 52. The mass air flow sensor 46 is also shown in the sectional view with the opening 48 for the air flowing into the body of the mass air flow sensor 46. The air is guided to reach the sensing element 54 inside the body of the mass air flow sensor 46 and is as well guided to leave the body of the mass air flow sensor 46 on the rear side in flow direction 50 in a well-defined manner.