DE60123350T2 - Cylinder head cover for a combustion engine - Google Patents

Description

BACKGROUND OF THE INVENTION

1. Field of the invention

The The present invention relates to a cylinder head cover for covering a cylinder head of an internal combustion engine according to the preamble of Claim 1.

2. Description of the related State of the art

In a conventional one Internal combustion engine is the head cover for covering the upper part the cylinder head as a separate component compared to the air purifier. This arrangement leads disadvantageously to an increase the number of parts to be produced. In addition, the separate arrangement leads to make the whole engine system bulky and heavy.

When a possibility, addressing the above problem, JP-A-9 (1997) -112358 teaches a one-piece Structure of a cylinder head cover and air purifier. The air purifier, which is formed integrally with the head cover is at the upper end arranged the head cover.

Although this one-piece structure is expedient, However, it suffers from the following disadvantage. Especially is according to JP-A-9-112358 a Gas / liquid (Lubricating oil) -Trennkammer for passing gas provided in the interior of the cylinder head gasket and the aforementioned Air purifier is over arranged this separation chamber. As a result of this two-story structure, which includes the separation chamber and the air purifier, can increase the height of the entire Head gasket become excessively large.

In such an unfavorable Fall can reduce the height the head cover can be achieved simply by the fact that the internal volumes the separation chamber and the air cleaner are reduced. Indeed Such a reduction of the chamber and the cleaner can a Reduction of gas / liquid separation efficiency in the separation chamber or a deterioration of the sound-absorbing Effect for Inlet gases in the air purifier effect.

One another problem of the usual The prior art is achieved by the use of a suction tube (made for example of rubber) for passing gas for passing gas flowing past caused by the cylinder head cover to the valve body, as it in JP-A-1 (1989) -290907. The suction tube is on one End with the exhaust port of the head cover for passing gas and at the other end connected to the inlet port of the valve body for passing gas.

With such an arrangement, the exhaust gas for passing gas in addition to others required components are produced. In addition, the manufacturing process for the Engine system as a result of increased The number of parts used become time consuming. Even worse However, that is the usual Suction pipe for passing gas often by freezing liquid, which of the passing gases has been disconnected.

Out EP-A-0 432 012, in contrast Claim 1 is delimited, is a cylinder head cover with a Air cleaning element known, which is completely housed in an upper housing is.

According to US-A-6 095 105 are the ignition coils in arranged a dust box of an air filter.

SUMMARY THE INVENTION

The The present invention is proposed under the aforementioned conditions Service. An object of the present invention is therefore to to provide a new arrangement of a cylinder head cover that is not suffers from the aforementioned disadvantages.

These The object is achieved according to the features of claim 1.

Preferably is the air purifier with a flap body (throttle) over the Separation chamber connected and the separation chamber is with a suction port for passing gas provided directly with an inlet port of the valve body for passing gas connected is.

Preferably The air purifier can be a dust box, a clean box and a Have filter element. The clean box can be removed from the dust box be attached from above. The filter element can between the dust box and the pure box. The dust box may be ignition coils for cylinders of the internal combustion engine.

With Such an arrangement is the ignition coils through the dust box protected by the air cleaner, no further protection means are provided for the ignition coils have to. Furthermore, the ignition coils advantageously by the gas flow inside the air cleaner cooled.

Preferably, the separation chamber may be elongated along the row of cylinders of the engine be, whereby the internal volume of the chamber is increased.

Preferably For example, the cylinder head cover of the second aspect may further include a first Contact area, in the suction connection for passing gas an opening has. The first contact surface may be against a second Contact surface of the door body depressed be in which the inlet port for passing gas has an opening.

Preferably The first contact surface can be horizontal or substantially horizontally with the upwardly directed suction port for passing gas be held. Likewise, the second contact surface can be horizontal or substantially horizontally with the inlet port facing down for passing gas be held.

Further optional features and advantages of the present invention from the following detailed description with reference to the attached Drawings clear.

SUMMARY THE DRAWINGS

1 FIG. 10 is a sectional view showing the basic structure of a cylinder head cover according to a first embodiment of the present invention. FIG.

2 is a sectional view taken along the line II-II of 1 ,

3 FIG. 10 is a sectional view showing the basic structure of a cylinder head cover according to a second embodiment of the present invention. FIG.

4 is a sectional view taken along the line IV-IV of 3 ,

5 is an exploded view showing the main portions of the head cover of the second embodiment.

DETAILED DESCRIPTION THE PREFERRED EMBODIMENTS

The preferred embodiments The present invention will be described below with reference to FIG the attached Drawings described.

1 and 2 illustrate a cylinder head cover according to a first embodiment of the present invention. In the figures, the reference numeral designates 1 a cylinder head of an internal combustion engine. Like it out 2 is apparent, the engine comprises three cylinders A1, A2 and A3, which are arranged in a row. A cam gear that is responsible for actuating, for example, the intake or exhaust valves is in a valve system chamber 2 housed at the top of the cylinder head 1 located. The cylinder head cover (generally indicated by the reference numeral 3 designated) is removable on the cylinder head 1 attached to the valve system chamber 2 to close.

The cylinder head cover 3 includes a suitably profiled housing in which an air filter element 4c and a gas-liquid separation chamber 5 are provided for passing gases. The profiled housing includes a lower housing (dust box) 4a and an upper housing (pure box) 4b , removable on the lower case 4a is attached from above. The filter element 4c is between the lower and the upper case 4a . 4b arranged, which passes through the two housings 4a . 4b partitioned space is partitioned. The lower and the upper case 4a . 4b and the aforementioned filter element 4c form an air purifier 4 ,

As it is in 1 is shown, the lower housing 4a of the air filter 4 essentially at the same height and adjacent to the separation chamber 5 arranged. On average, the separation chamber tapers 5 upwards (ie in the height direction of the air cleaner 4 ), with their highest point higher than the inner bottom surface of the lower housing 4a , The separation chamber 5 is how it is in 2 is elongated along the row of cylinders A1 to A3 of the engine.

With the above arrangements is the height of the air cleaner 4 not in addition to the height of the separation chamber 5 , Thus, the overall height of the cylinder head cover is advantageously made smaller in comparison to the structure known from the prior art, while the respective heights of the cleaner 4 and the chamber 5 can be made larger. Accordingly, the inner volumes of the cleaner 4 and the chamber 5 sufficiently large, which advantageously leads to an excellent gas / liquid separation effect in the separation chamber 5 and an excellent heat-absorbing effect in the air cleaner 4 leads. As stated above, the chamber is 5 along the row of three cylinders A1 to A3 (see 2 ) elongated. This structure serves to ensure a sufficiently large internal volume of the chamber 5 sure.

As it is in 2 is shown, is an air inlet tube 6 for a supply of air with the lower housing 4a connected. The lower case 4a is internally provided with coil assembly sections having three ignition coils 7 are arranged. It is clear that every coil 7 for the corresponding cylinder A1 to A3 of the internal combustion engine is provided.

The upper case 4b is over a valve body 9 and an inlet channel 10 with a bellows with the intake pipe 8th connected. The valve body 9 is at one end on the intake manifold 8th attached and detachable at the other end in the inlet channel 10 used. The inlet channel 10 made of an elastic material such as rubber is with an outlet port 11 connected to passing gas, resulting from the separation chamber 5 extends out. The outlet connection 11 for passing gas is removable in the inlet duct 10 used.

With the above structure, air is introduced into the lower case 4a of the air purifier 4 over the inlet pipe 6 brought in. In the case 4a the air cools the ignition coils 7 , Thereafter, the air enters the upper housing 4b through the filter element 4c one.

Further, the purified air in the respective cylinders A1 to A3 of the engine is transmitted via the intake pipe 8th distributed.

The gas flowing past the valve system chamber flows into the separation chamber 5 to be subjected to gas / liquid separation. Thereafter, the lubricant-cleaned gas through the suction port 11 for passing gas passed to join the main flow passing through the inlet duct 10 flows.

Reference is now made to the 3 to 5 , which illustrate an arrangement of a cylinder head cover according to a second embodiment of the present invention.

The illustrated internal combustion engine comprises a cylinder head 1 similar in arrangement to the in 1 and 2 is shown counterpart. On top of the cylinder head 1 is a cylinder head cover 30 for enclosing a valve system chamber 2 intended. The head cover 30 is made of a synthetic resin and removable on the cylinder head 1 attached. The cylinder head 1 is on one side of it with a suction pipe 80 connected with a compensation tank 80a is provided.

The cylinder head cover 30 is integral with an air purifier 40 and with a gas / liquid separation chamber 50 designed for passing gases. As in the first embodiment, the air purifier comprises 40 a lower housing (dust box) 40a which is at substantially the same height with the separation chamber 50 is arranged. The lower case 40a and the separation chamber 50 are arranged adjacent to each other. In 3 is the highest point of the separation chamber 50 over the inner bottom surfaces of the lower case 40a , The lower case 40a Although not shown, it is connected to an air intake pipe for sucking in the air.

In the lower case 40a is a predetermined number of ignition coils 70 provided for the corresponding cylinder of the internal combustion engine.

The air purifier 40 further comprises an upper housing (pure box) 40b and a filter element 40c , The upper case 40b , which is made of a synthetic resin, is detachable on the lower case 40a fastened from above. The filter element 40c is between the lower and the upper case 40a . 40b intended.

The reference number 90 denotes a valve body which is connected to a throttle valve 90b is provided. The valve body 90 is with a gas inlet hole 90a formed in which the throttle valve 90b is housed. The valve body 90 is located above the separation chamber 50 and is at one end with one side of the compensation tank 80a by means of screws 12 connected (see 3 and 5 ). At the other end (inlet end) is the valve body 90 removable in an air outlet 40d used in the upper case 40b of the air purifier 40 is trained. To make a hermetic connection between the valve body 90 and the air outlet 40d to reach, becomes a sealing ring 13 used, which is formed of an elastic material such as rubber.

The head cover 30 includes, as it is best in 4 is shown, a horizontal upper surface 14 that with the valve body 90 above the separation chamber 50 in contact. The upper surface 14 is with a suction connection 110 provided for passing gas, which is open at the top. The valve body 90 on the other hand, comprises a horizontal bottom surface 15 that fits tightly to the top surface 14 of the head cover 30 is applied. Thus, the valve body 90 on the head cover 30 stably positioned.

Further, the valve body 90 with an inlet connection 90c provided for passing gas, which at its upper end with the bore 90a communicates. The inlet connection 90c is down in the floor area 15 open to the aforementioned suction connection 110 to communicate for passing gas.

The valve body 90 is with both the cylinder head 1 as well as with the head cover 30 bolted in the following way.

As it is in 4 is shown, comprises the valve body 90 a first attachment leg 90d and a second attachment leg 90 , The first attachment leg 90d is formed with a bore, which is the insertion of the shaft of a long screw 16 allows (but not the passage of the head). Likewise, the second attachment leg 90e formed with a further bore, which is the insertion of the shaft of a short screw 17 allows (but not the passage of the head). The long screw 16 is with the cylinder head 1 connected while the short screw 17 with the head cover 30 is connected, with their axes are held vertically. Thus, the valve body 90 stable on the cylinder head 1 and also on the head cover 30 attached. A spacer 18 will for the long screw 16 As shown used to the given distance between the first attachment leg 90d and the cylinder head 1 to maintain.

To achieve a hermetic connection between these two connections, a sealing ring 19 used, which is made of an elastic material such as rubber. The illustrated sealing ring 19 is in the upper contact area 14 of the head cover 30 embedded, although the same on the valve body 90 can be provided. The sealing ring 19 can be replaced by other types of gaskets.

In the assembled state, the inlet port communicates 90c for passing gas directly to the suction connection 110 for passing gas. Thus, there is no need to use an additional blowby gas exhaust pipe as disclosed in JP-A-1 (1989) -290907. Accordingly, the length of the gas passage from the separation chamber 50 to the inlet hole 90a shortened, which is advantageous so that the passing gas flows gently.

The valve body 90 Although not shown in the figures, it is provided with conventional known components such as an idling control overflow pipe or an air valve. In addition, on the valve body 90 a heater is provided to prevent the air valve or the throttle valve from freezing. Advantageously, this heater is used to warm up the inlet port 90c for passing gas as well as the suction connection 110 for passing gas, which is in direct contact with the inlet port 90c is held used.

In the embodiment described above, the valve body is 90 both with the metal cylinder head 1 as well as the resin head cover 30 although the present invention is not limited thereto. For example, the valve body 90 only with the cylinder head 1 be connected. When the head cover 30 Made of metal, the valve body can 90 only with the head cover 30 be connected.

Claims (5)

Cylinder head cover ( 3 ; 30 ) for covering a cylinder head ( 1 ) of an internal combustion engine, wherein the head cover ( 3 ; 30 ) comprises: a housing ( 4a . 4b ; 40a . 40b ); one with the housing ( 4a . 4b ; 40a . 40b ) integral air purifier ( 4 ; 40 ); and a gas / liquid separation chamber ( 5 ; 50 ) for passing gas, wherein the separation chamber ( 5 ; 50 ) integral with the housing ( 4a . 4b ; 40a . 40b ) is configured; the air purifier ( 4 ; 40 ) and the separation chamber ( 5 ; 50 ) are arranged horizontally to each other; the separation chamber ( 5 ; 50 ) in the height direction of the air cleaner ( 4 ; 40 ); the air purifier ( 4 ; 40 ) a dust box ( 4a ; 40a ), a pure box ( 4b ; 40b ) and a filter element ( 4c ; 40c ), wherein the pure box ( 4b ; 40b ) removable on the dust box ( 4a ; 40a ) is fastened from above, characterized in that the filter element ( 4c ; 40c ) between the dust box ( 4a . 40a ) and the pure box ( 4b ; 40b ), wherein the dust box ( 4a ; 40a ) Ignition coils ( 7 ; 70 ) for cylinder (A1-A3) of the internal combustion engine receives. Cylinder head gasket ( 30 ) according to claim 1, wherein the air cleaner ( 40 ) with a valve body ( 90 ) above the separation chamber ( 50 ) and wherein the separation chamber ( 50 ) with a suction connection ( 110 ) is provided for passing gas directly to an inlet port ( 90c ) of the valve body ( 90 ) is connected for passing gas. Cylinder head gasket ( 3 ; 30 ) according to claim 1 or 2, wherein the separation chamber ( 5 ; 50 ) is elongated along the row of cylinders (A1-A3). Cylinder head cover ( 30 ) according to claim 2, further comprising a first contact surface ( 14 ), in which the suction connection ( 110 ) has an opening for passing gas, wherein the first contact surface ( 14 ) against a second contact surface ( 15 ) of the valve body ( 90 ) is pressed, in which the inlet port ( 90c ) has an opening for passing gas. Cylinder head cover ( 30 ) according to claim 4, wherein the first contact surface ( 14 ) horizontally or substantially horizontally with the upwardly directed suction port ( 10 ) is held for passing gas, wherein the second contact surface ( 15 ) horizontally or substantially horizontally with the downwardly directed inlet port ( 90c ) is held for passing gas.