AIR FILTER ARRANGEMENT FOR AN INTERNAL COMBUSTION ENGINE

Abstract

An air filter arrangement for an internal combustion engine, especially for a two-cycle engine in a manually guided implement such as a power saw, a cut-off machine, etc., and including an air filter element that delimits a first clean chamber. The air filter arrangement has an inlet opening for an air channel and an inlet opening for a mixture channel. A shield is provided for shielding the air filter element relative to the mixture channel. The inlet opening of the air channel and the inlet opening of the mixture channel are interconnected via the shield.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

This object, and other objects and advantages of the present invention, will appear more clearly from the following specification in conjunction with the accompanying schematic drawings, in which:

FIG. 1 is a side view of one exemplary embodiment of an air filter arrangement;

FIG. 2 is a plan view of the air filter arrangement of FIG. 1;

FIG. 3 is a perspective illustration of the air filter arrangement of FIG. 1;

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a perspective illustration of the air filter arrangement without the filter element;

FIG. 8 is a perspective illustration of the air filter arrangement with a partially cut-away air filter element; and

FIG. 7 is an exploded view of the air filter arrangement.

Claims

1. An air filter arrangement for an internal combustion engine and having a housing (21) with an inlet opening (12) for an air channel (11) and an inlet opening (10) for a mixture channel (9), comprising: an air filter element (4) that delimits a first cleaning chamber (18) and;a shield for shielding said air filter element (4) relative to said mixture channel (9), wherein said inlet opening (12) of said air channel (11) is adapted to be in communication with said inlet opening (10) of said mixture channel (9) via said shield (17).

2. An air filter arrangement according to claim 1 wherein said shield (17) delimits a second clean chamber (28), wherein said shield (17) has at least one communication opening (26) to connect said first clean chamber (18) and said second clean chamber (28), and wherein said inlet openings (10, 12) of said mixture channel (9) and said air channel (11) respectively open into said second clean chamber (28).

3. An air filter arrangement according to claim 2, wherein said shield (17) extends both said mixture channel (9) and said air channel (11) to said at least one communication opening (26).

4. An air filter arrangement according to claim 1, wherein said shield (17) includes a bulged portion (32) that extends over said inlet opening (10) of said mixture channel (9).

5. An air filter arrangement according to claim 4, wherein said shield (17) includes a channel-like connecting portion (33) that extends from said inlet opening (10) of said mixture channel (9) to said inlet opening (12) of said air channel (11), and wherein said air channel (11) and said mixture channel (9) are adapted to be interconnected via said connecting portion (33).

6. An air filter arrangement according to claim 5, wherein said channel-like connecting portion (33) adjoins said bulged portion (32).

7. An air filter arrangement according to claim 5, wherein said shield (17) includes a transverse portion (34) that adjoins said channel-like connecting portion (33) and extends transverse to said connecting portion.

8. An air filter arrangement according to claim 7, wherein said transverse portion (34) extends at least partially over said inlet opening (12) of said air channel (11).

9. An air filter arrangement according to claim 7, wherein said transverse portion (34) is provided with a top portion (19) in which is disposed at least one communication opening (26).

10. An air filter arrangement according to claim 9, wherein said top portion (19) is disposed on that side of said transverse portion (34) that faces away from said connecting portion (33).

11. An air filter arrangement according to claim 1, wherein at least one communication opening (26) is disposed on a side of said inlet opening (12) of said air channel (11) that faces away from said inlet opening (10) of said mixture channel (9).

12. An air filter arrangement according to claim 1, wherein at least one guide surface (35) is disposed on said shield (17) adjacent to said inlet opening (12) of said air channel (11), and wherein said at least one guide surface (35) is adapted to guide retained fuel to said inlet opening (10) of said mixture channel (9).

13. An air filter arrangement according to claim 1, wherein in a customary installation position of said air filter arrangement, and relative to an effective direction (50) of the force of gravity, said inlet opening (12) of said air channel (11) is disposed above said inlet opening (10) of said mixture channel (9).

14. An air filter arrangement according to claim 1, wherein said air filter element (4) is adapted to extend over said shield (17) in the manner of a dome.