WO2012025455A1

WO2012025455A1 - Air intake filter for an internal combustion engine

Info

Publication number: WO2012025455A1
Application number: PCT/EP2011/064277
Authority: WO
Inventors: Timo Dirnberger; Andreas Weber
Original assignee: Mann+Hummel Gmbh
Priority date: 2010-08-24
Filing date: 2011-08-19
Publication date: 2012-03-01
Also published as: CN103261653B; DE102010035353A1; DE102010035353B4; IN2013MN00340A; CN103261653A

Abstract

The invention relates to an air intake filter for internal combustion engines, comprising a filter element (5) received in a filter housing (2) to which air can be fed via a main intake opening (6). An air intake opening (8) is provided in the filter housing (2), wherein said air intake opening communicates with the raw side of the filter element (5) and is arranged spaced apart from the main intake opening (6).

Description

description

Air intake filter for an internal combustion engine

Technical area

The invention relates to an air intake filter for an internal combustion engine according to the preamble of claim 1. State of the art

Air intake filter are used in the intake tract of internal combustion engines to subject the sucked outside air before the introduction into the cylinder of the internal combustion engine of a filtration. Air intake filters comprise a filter element accommodated in a filter housing, through which the air to be filtered flows. The filter housing has a suction port, which is connected to the intake passage of the intake.

In very heavy rain, there is always the risk of water hammer, in which water passes through the suction port in the filter housing and the filter element passes until it reaches the cylinder of the internal combustion engine. In the case of water hammer, there is a risk of damaging the engine.

Problems can also occur in winter, when snow or ice close the intake partially or completely, so that no sufficient intake air flow through the filter element is more guaranteed.

[0005] The invention is based on the object of designing an air intake filter for internal combustion engines with simple design measures in such a way that both in heavy rain and in wintry conditions reduced performance or even destruction of the engine.

Disclosure of the invention

This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

The air intake filter according to the invention is used in the intake tract of internal combustion engines for the filtration of the intake ambient air and comprises in a filter housing, a filter element to which air can be supplied via a main suction, which is introduced into the filter housing. In addition to the main suction opening, an additional suction opening is introduced into the filter housing, which, like the main suction opening, communicates with the raw side of the filter element and is arranged at a distance from the main suction opening. Accordingly, the filter housing has at least two suction openings, via which air is to be supplied to the filter element. Normally, the air supply is at least for the most part via the main intake; the auxiliary suction port is either disabled, e.g. Blocked by a check valve, or it passes due to a suitably smaller cross-section of the additional suction only a smaller partial air flow through this opening to the filter element.

In very heavy rain, the situation may occur that water passes through the intake of the engine to the main intake in the filter housing of the air intake filter, so that the air supply over the Main suction is interrupted. Here, the pressure difference across the filter element abruptly increases, which is used for the intake of combustion air through the additional intake. In the event that the additional intake opening is blocked by a valve, the pressure difference causes the valve to open so that the additional intake opening is released and air can flow to the filter element. Even if no valve is inserted in the auxiliary suction opening, the closure of the main suction opening and the resulting pressure change causes a strong suction of combustion air via the Zusatzansaugöff- voltage, which thus at least partially compensates for the loss of suction via the main intake.

The air supply via the Zusatzansaugöffnung not only works when water enters the intake tract of the internal combustion engine, but also in other difficult weather conditions, e.g. in the event of snow and ice entering the intake tract and clogging the main intake opening.

To ensure that not also the Zusatzansaugöffnung is added by water or snow or ice, the additional opening is preferably located at a significant distance from the main intake to the filter housing. Conveniently, the Zusatzansaugöffnung is based on the regular installation position of the air intake filter in the engine compartment of the vehicle positioned at a higher point than the main intake, so that also the risk is reduced that water can penetrate into the additional suction. Furthermore, it is advantageous not to supply the additional intake opening with air via the same intake duct as the main intake opening, but rather to arrange it outside the intake duct so that air is supplied directly to the additional intake opening from the engine compartment of the vehicle.

The filter housing of the air intake filter is expediently composed of a base housing and a lid or cap to be mounted thereon. The additional suction is preferably in the hood. Also, the main suction can be introduced into the hood, but with distance to the additional suction.

In principle, however, it is also possible to introduce the main intake opening and the additional intake opening into the basic housing of the filter housing. Furthermore, it is possible to provide the main intake opening in the main housing and the additional intake opening in the hood or vice versa.

The additional suction opening is preferably arranged on the raw air side.

It is envisaged that in the Zusatzansaugöffnung an insert is used. The insert serves, for example, for flow guidance; In this case, the insert part is designed as a flow guide part. Thus, it may be expedient to provide an air deflection of the introduced via the additional suction air via the insert, for example, a deflection by 90 °. The insert part assumes a prefilter function by, for example, a sieve or another filter element is inserted into the insert part. In the case of a sieve, this, as well as the insert, advantageously made of plastic, such as polyamide (PA). Likewise, a sieve made of plastic fabric is suitable, for example, PA. A sieve or plastic fabric has a prefilter function, but it is mainly used to reduce hot air intake from the engine compartment.

According to yet another expedient embodiment, an outflow opening is introduced into the filter housing in the region of the raw air side of the filter element, can be derived from the filter housing via the penetrated water, which has been introduced via the intake duct. Also in the discharge opening, an insert may be used, which is optionally provided with a filter element, such as a sieve to complicate the air supply via the discharge opening and in the event that air is still sucked through the outflow opening, a prefilter function takes over. The outflow opening is expediently located at a low point in the filter housing, based on the regular installation position of the air intake filter in the engine compartment of the vehicle.

Brief description of the drawings

Further advantages and expedient embodiments can be found in the further claims, the description of the figures and the drawings.

Show it: 1 is an air intake filter in perspective,

2 shows the air intake filter in a side view,

3 is a view of the inside of a hood of the air intake filter,

Fig. 4 shows the air intake filter in section, with an insert in one

Zusatzansaugöffnung, which is introduced into the hood,

5 shows an enlarged view of the insert in the Zusatzansaugöffnung in the hood,

6 shows the insert in perspective view,

7 is an enlarged view of a discharge opening with a

Insert in the hood of the filter housing,

8 shows the insert part, which is to be inserted into the outflow opening, in perspective view,

9 shows a filter housing of an air intake filter in a further

Illustration, with a main suction opening and an opposite additional suction opening,

10 shows the filter housing according to FIG. 9 in a further perspective view, FIG.

11 shows a complete air intake filter with a filter housing according to the figures 9 and 10,

12, 13 different views of the filter housing with an insert part, which is inserted into the Zusatzansaugöffnung, 14 shows the insert part in a perspective view,

Fig. 15, the insert in plan view.

In the figures, the same components are provided with the same reference numerals. Embodiments of the invention

In the figures 1 to 8, a first embodiment of an air intake filter for an internal combustion engine is shown. 1, the air intake filter 1 comprises a filter housing 2, which is constructed in two parts with a base housing 3 and a hood 4, and a filter element 5 accommodated in the main housing 3, through which the combustion air to be filtered flows. The aufzusetzende on the base housing 3 hood 4 forms a cover and is provided with a main suction port 6 through which the unpurified combustion air is passed into the interior of the filter housing 2 and led to the raw side of the filter element 5. After flowing through the filter element 5, the purified air is discharged via a discharge port 7 in the direction of the internal combustion engine.

As can be seen from the side view of the air intake filter 1 according to FIG. 2, an additional intake opening 8 is introduced into the hood 4 of the filter housing 2 at a lateral distance from the main intake opening 6. Into the additional intake 8, an insert 9 is used, which has an air guide and filter function. The main suction opening 6 is located with the outflow in a first plane which is perpendicular to a second plane is located in which at least approximately the wall outside of the hood 4 with the main suction port 6 and the additional suction 8 is located.

The additional suction opening 8 has a significant distance both to the main suction opening 6 and to the discharge nozzle 7. In the installation position, the additional suction opening 8 is located at a high position of the filter housing, so that it is ensured that penetrating water or snow or ice, which can lead to a blockage of the main suction 6, not enforce the additional suction 8. The main intake port 6 either opens directly to the engine compartment of the vehicle in which the air intake filter 1 is installed, or is supplied with combustion air via an intake passage in the engine compartment, in which case the auxiliary intake port 8 is positioned outside this intake passage, so that air out the engine compartment via the additional intake 8 can flow.

As shown in FIG. 3 in conjunction with the enlarged view of FIG. 5, located on the inside of the hood 4, a plurality of stiffening ribs 10. The insert part 9 is preferably inserted from the inside into the additional intake 8 in the hood 4 , As can be seen from FIGS. 3 to 6, the insert part 9 is of annular design and has a central recess through which additional air enters the interior of the filter housing to the raw side of the filter element. In the central recess, a support member 11 is inserted into the insert part 9. The support part 11 is connected to a nem central support ring and radially extending struts provided. It has a prefilter function and prevents coarse dirt or snow and ice from reaching the interior of the air intake filter via the additional intake opening 8. In addition, in the central recess of the insert part 9, a sieve can be used, for example, a sieve made of plastic fabric. The support member 11 serves in a further function as a support grid for a sieve, for example made of PA fabric. The support member 11 may be formed integrally with the hood 4.

As shown in FIG. 4, the insert part 9 is supported via an annular sealing element 12 on the raw side of the filter element 5. The sealing element 12 ensures that water introduced via the main intake opening or snow or ice does not reach the region of the inflow air side, with which the additional intake opening 8 communicates. The annular sealing element 12 is inserted into an annular groove on the end face of the insert part 9. For an application only as protection against water, a version without seal is suitable.

As can be seen in Figures 7 and 8, in the hood 4 in the region of the lowest point - based on the regular installation position in the engine compartment - an outflow opening 13 may be introduced, in which an insert member 14 is inserted. Water which has penetrated into the filter housing in the region of the unfiltered air side is discharged again via the outflow opening 13. The insert 14 has a central recess into which, similar to the insert 9, which is inserted into the Zusatzansaugöffnung, a sealing screen can be used.

In the figures 9 to 15, a second embodiment is shown. In the box-shaped base housing 3, in which the filter element is used, both the main suction port 6 and the additional suction port 8 are introduced. The main suction opening 6 is located on a side channel of the box-shaped base housing 3, the additional suction 8 is opposite the main suction port 6, the two suction ports 6 and 8 are located at or near the narrow sides of the base housing 3. Zusatzansaugöffnung 8 is located at the the underside facing away from the open side of the base housing. 3

In assembled position, as shown in FIG. 1 1, placed on the base housing 3, the hood 4, which is connected to the base housing 3 and forms the filter housing 2 together with the base housing. In the hood 4 of the discharge nozzle 7 is introduced, via which the filtered combustion air is discharged in the direction of the internal combustion engine.

As can be seen in Figures 12 and 13 in conjunction with Figures 14 and 15, an insert part 9 made of plastic is inserted into the Zusatzansaugöffnung 8, which is provided in the region of Zusatzansaugöffnung 8 with a one-piece support member 11 in the form of a cross , The recess in the insert part 9, which corresponds to the additional suction opening 8, can be covered by a sieve. The insert 9 causes a flow diversion by 90 °. The combustion air is supplied from outside via the flow opening in insert part 9, in which the cross-shaped support member 11 is inserted. The cross-shaped support member 11 is provided to protect the mesh against mechanical damage from the outside. In the direction of flow, a housing part in pyramidal shape follows, which is designed to be open at the top, wherein the open side is at a 90 ° angle to the inflow side of the insert part 9. In the installed state (FIGS. 12, 13), the open side of the insert part 9 faces the interior of the box-shaped base housing 3, so that the combustion air flowing in via the additional suction opening 8 is introduced via the inflow side of the insert part 9 and then deflected by 90 ° in the insert part and is conducted into the interior of the basic housing 3.

Claims

claims

1. Air intake filter for an internal combustion engine, with a in a filter housing (2) recorded filter element (5) via a Hauptansaugöffnung (6) in the filter housing (2) air can be supplied, characterized in that in the filter housing (2) has a Zusatzansaugöffnung ( 8) is introduced, which communicates with the raw side of the filter element (2) and which is arranged at a distance from the Hauptansaugöff- (6), wherein in the Zusatzansaugöffnung (8) an insert part (9) is inserted, wherein the insert part (9). a pre-filter function takes over, for example, by a sieve or other filter element is inserted into the insert.

2. Air intake filter according to claim 1, characterized in that the insert part (9) is designed as a flow guide part.

3. Air intake filter according to claim 1 or 2, characterized in that the insert part (9) via a sealing element (12) on the raw side of the filter element (2) is supported.

4. Air intake filter according to one of claims 1 to 3, characterized in that in the Zusatzansaugöffnung (8), a prefilter element is used.

5. Air intake filter according to one of claims 1 to 4, characterized in that the Zusatzansaugöffnung (8) in the same housing part of the filter housing (2) as the main suction port (6) is introduced.

6. Air intake filter according to one of claims 1 to 5, characterized in that the main suction port (6) is connected to an intake passage and the additional intake port (8) is arranged outside of the intake port.

7. Air intake filter according to one of claims 1 to 6, characterized in that the Zusatzansaugöffnung (8) and the Hauptansaugöffnung (6) are introduced on opposite sides in the filter housing (2).

8. Air intake filter according to one of claims 1 to 7, characterized in that the Zusatzansaugöffnung (8) based on the installation position of the air intake filter (1) at a higher point in the filter housing (2) is introduced as the main suction port (6).

9. Air intake filter according to one of claims 1 to 8, characterized in that in the filter housing (2) in the region of the raw air side of the filter element (5) an outflow opening (13) is introduced.