ES2200476T3 - INTERNAL COMBUSTION ENGINE THAT INCLUDES A COMPACT CIRCUIT OF AIR ADMISSION. - Google Patents

Abstract

INTERNAL COMBUSTION ENGINE OF THE TYPE THAT INCLUDES AN AIR INTAKE CIRCUIT THAT HAS AN AIR FILTER (50), A BUTTERFLY COMPARTMENT (30) AND AN INTAKE MANIFOLD (23), COMPOSING THESE INTAKE MANIFOLD (23) OF A DISTRIBUTING CAVITY (25) AND MISCELLANEOUS INDIVIDUAL CONDUCT (26) INTENDED TO FEED THE CORRESPONDING ADMISSION CONDUCTES PROVIDED IN THE HEAD (10), CHARACTERIZED BECAUSE THE INTAKE MANIFOLD (23), THE MARIPOSA FILM COMPARTMENT (30) AIR (50) ARE POSITIONED ABOVE THE HEAD COVER (1).

Description

Internal combustion engine comprising a compact air intake circuit.

The present invention relates to a motor of internal combustion intended to especially equip a vehicle car. The present invention relates more particularly to air intake circuit.

Classically, the air intake circuit of an engine consists of upstream to downstream in the direction of the air flow of an air filter, of a housing of butterfly valve (especially in the case of engines controlled ignition), of a collector formed by a cavity or intake chamber where a series of ducts and intake ducts arranged in the cylinder head, leading to these ducts arranged in the cylinder head in the combustion chambers by holes closed selectively by valves.

The elements of the air intake circuit other than the intake ducts arranged in the cylinder head they are usually housed outside the engine in the engine compartment Taking into account the evolution of the design of motor vehicles, the dimensions of this compartment motor are today increasingly reduced, and it is therefore important make this air circuit more and more compact.

Among the different solutions proposed, it is known to have the intake manifold supported by the engine such as described especially in patent no. FR90-08075, registered by the applicant, where the proposed solution consists of integrating the intake manifold into the engine cover. According to this prior art, the intake ducts arranged in the cylinder head are oriented towards above to drain into the upper face of the cylinder head in the proximities of one of its longitudinal edges. Thus, the corresponding integrated intake manifold ducts on the cover, they can use the entire width of the cover, leaving the set extremely collected and with a device minimum

The solutions known according to the technique previous are limited however to place the collector above of the engine, remaining the rest of the air circuit in the engine compartment or getting to hang on the engine block through of fixing flanges. Assemblies of this type are still still too cumbersome and can be sources of vibrations and by So much noise.

The object of the present invention is therefore improve the state of the existing technique by supporting the engine outside air circuit assembly from the top the motor.

The internal combustion engine according to the invention It is of the type comprising an air intake circuit that carries an air filter, a butterfly valve housing and a manifold of admission, composing the intake manifold of a cavity of distribution and of a series of individual conduits destined to feed the corresponding intake ducts arranged in the butt

According to the invention, the combustion engine internal is characterized in that the intake manifold, the butterfly valve housing and air filter are positioned above the cover.

According to another characteristic of the combustion engine internal object of the invention, the upstream and water ends below the butterfly valve housing are directly introduced into corresponding openings of the air filter and the intake manifold.

According to another characteristic of the combustion engine internal object of the invention, the upstream and water ends below the butterfly valve housing are surrounded radially by an O-ring designed to ensure the tightness and maintenance in position of these ends in the corresponding openings of the air filter and the manifold admission.

According to another characteristic of the combustion engine internal object of the invention, the engine incorporates a chamber of crankcase gas settling formed directly from foundry, this decantation chamber being defined by a first cavity arranged in the upper face of the cover and a second cavity in a complementary manner arranged in a lid intended to close said first cavity.

According to another characteristic of the combustion engine internal object of the invention, the manifold distribution cavity of admission rests directly on the lid that closes the chamber of decantation of the crankcase gases arranged in the cover, a simple drill calibrated through the bottom wall of the lid which cooperates with a corresponding opening arranged through the bottom wall in front of the distribution cavity allows recycle the crankcase gases directly into the manifold admission.

According to another characteristic of the combustion engine internal object of the invention, the intake manifold and the butterfly valve housing are fixed directly on the crankcase decantation chamber cover.

According to another characteristic of the combustion engine internal object of the invention, the decantation chamber cover of the integrated crankcase gases from the foundry a channeling element used for gas transfer additional to the air intake circuit, leading to this channeling element at its downstream end by means of a nozzle that extends so that it protrudes above the cover, this nozzle being adapted to penetrate the cavity of distribution of the intake manifold through an opening correspondent.

According to another characteristic of the combustion engine internal object of the invention, the decantation chamber cover of the crankcase gases integrates a tubular duct element that flows into the settling chamber and intended to cooperate with a corresponding air filter opening, allowing this duct element recycle crankcase gases directly into the air filter

The aims, aspects and advantages of the present invention, according to the detailed description which follows in an embodiment of the invention given to non-limiting example title, referring to the drawings annexes, in which:

- Figure 1 is a perspective view with neat exploded view of an internal combustion engine cover equipped with an intake circuit according to the invention;

- Figure 2 is a view similar to Figure 1 which requires the positioning of the intake manifold and the butterfly valve of the gases in the cover;

- Figure 3 is a partial sectional view, according to a plane parallel to the longitudinal axis of the motor, of cylinder head cover and intake manifold;

- Figure 4 is a partial sectional view, according to a plane perpendicular to the longitudinal axis of the motor, of cover, manifold and air intake filter.

In accordance with the figures, they have only been represented the necessary elements for the understanding of the invention. In addition, to facilitate the reading of the drawings, the same pieces bear the same references of a figure to other.

Referring to figures 1 to 4, it has been schematically represented a cover 1 that covers the cylinder head 10 of an internal combustion engine of the multi-cylinder type specially designed to equip a motor vehicle. The motor incorporates on the other hand and in a classic way, a crankcase not represented, formed by a block of cylinders with a tank of oil at the bottom.

In the foundry of the cover 1 and protruding on the upper face of the latter, it is arranged an open cavity 2 defining the lower part of the chamber of 3 recovery and decantation of combustion gases that escape in the crankcase through the different games of functioning.

Classically, appropriate steps arranged to through the cylinder block and cylinder head 10 raised above the They allow the communication of all the parts of the motor housing with cover 1 and cavity 2.

The cavity 2 is closed by a lid 4 from cast iron that is fixed on top of the cover 1 by appropriate means. This cover 4 has a inner cavity 5 in a manner substantially conjugated to that of the cavity 2, which defines the upper part of the decantation chamber 3.

The settling chamber 3 is like this, according to the described embodiment, shared in a way substantially the same between the cover 1 and the cover 4. Obviously, it is possible to modify the respective proportions of the settling chamber contained in the cover 1 and the cover Four.

In accordance with the invention, the collector of intake 23, butterfly valve housing 30 and filter 50 air motor air intake circuit, are arranged above the cover 1 and rest on the latter especially through the lid 4.

The intake manifold 23, which is composed classically of a delivery cavity or intake chamber 25 and of multiple individual ducts 26 intended to feed the corresponding conduits arranged in the cylinder head 10, is shaped so that the delivery cavity 25 is positioned noticeably vertically under cover 4.

Thanks to the positioning of the collector of intake 23 directly above the cover 4, the connection of the settling chamber 3 to the intake manifold 23 can be performed then directly without there being a conduction in this regard.  Thus, a simple drill 12 on the roof of the lid 4 cooperating with an opening 22 arranged through the bottom wall in front of the distribution cavity 25 of the collector 23, allows recycling the crankcase gases directly in it. A seal 27 is located around the opening 22, to be interposed between the intake manifold 23 and the cover 4, and thus ensure the tightness of the assembly.

The intake manifold is fixed directly in cover 4 by means of fixing screws not shown that cooperate with flanges 28 that carries the intake manifold 23 and counter flanges 48 arranged on the top of the cover 4. It is of note that the counter flanges 48 are adapted to serve also flanges to fix the cover 4 on the cover 1.

The cover 4 integrates on the other hand from foundry, a channeling element 40 that flows into its downstream end by a nozzle 41 extending protruding over the top of the cover 4. This nozzle 41  is adapted to penetrate the intake manifold 23 through of the opening 22 and opening into the distribution cavity 25 substantially above hole 12.

This channeling element 40 can be connected at its downstream end to the recirculation circuit of the crankcase gases, to the purge circuit of the vapors of fuel trapped in the receptacle or even in the circuit Idle air intake if the latter is not integrated into the butterfly valve housing 30.

The integration of this pipeline element 40 on the cover 4 considerably simplifies the connection of the circuit of contribution of the additional gases corresponding to the air intake circuit, since the simple assembly of the manifold 23 on cover 4 secures this connection.

The intake manifold 23 presents for another part, a circular opening 29 arranged between the two flanges 28, through the side wall opposite conduits 26 of the delivery cavity 25 of manifold 23. It is directly in this opening 29 where the downstream end of the butterfly valve housing 30. This downstream end it is surrounded by an O-ring seal 31 that ensures the perfect tightness between the intake manifold and the housing  of the throttle valve 30 as well as the maintenance in position of this end in the corresponding opening 29 of the manifold of admission.

Both butterfly valve housing 30 as the intake manifold 23 are directly attached to the cover 4 by means of fixing screws not shown that cooperate with flanges 33 that carries the valve housing butterfly 30 and counter flanges 43 arranged on the side face opposite of the cover 4.

The upstream end of the housing of butterfly valve 30 is introduced similarly to the end of downstream in a corresponding opening 59 of the air filter 50. Similarly similar, an O-ring seal radially surrounding the upstream end of the housing of butterfly valve 30 ensures the tightness of the mounting between this last and the air filter 50.

The butterfly valve housing is it is thus directly connected to the intake manifold by one part and to the air filter on the other hand without conduits additional connection and no particular fixing device. The introduction of the downstream and upstream extremes of the throttle valve housing 30 respectively in the opening 29 of the intake manifold 23 and in the opening 59 of the air filter 50 is enough to ensure the tightness of the mounting.

The immediate proximity of the air filter 50 of the cover 4 also allows the direct operation of the connection of the decantation chamber 3 in the intake circuit upstream of the butterfly valve armature. To do so, the  cover 4 integrates, from cast iron, a duct element tubular 45 intended to be inserted directly into an opening corresponding 51 of the air filter 50.

Thanks therefore to the intake circuit according to the invention, the gas recirculation device of crankcase of the type of two branches, a low branch that joins the circuit intake downstream of butterfly housing 30 and a branch high that joins the intake circuit upstream of the butterfly valve housing 30, connects to the circuit admission directly without recourse to any conduits united.

Thus, thanks to the invention, the assembly of the different elements that make up the air intake circuit as well as the union of this one to the additional circuits of introduction of gases (crankcase gases, recirculated burned gases (EGR), etc.) can work extremely simply, because to the reduced number of pieces, pieces obtained mainly by molding and they do not need more than a limited number of operations Machining

Well understood, the invention is by no means limited to the embodiment described and illustrated, which has only been given as an example.

Claims (6)

1. Internal combustion engine of the type comprising an air intake circuit carrying an air filter (50), a butterfly valve housing (30) and an intake manifold (23), said intake manifold being composed (23 ) of a distribution cavity (25) and a series of individual pipes (26) intended to feed the corresponding intake ducts arranged in the cylinder head (10), characterized in that the intake manifold (23), the valve housing butterfly (30) and the air filter (50) are positioned above the cover (1), the ends upstream and downstream of the butterfly valve housing directly inserted into corresponding openings (59, 29) of the air filter (50) and the intake manifold (23), the engine also comprising a settling chamber (3) of the crankcase gases formed directly from the smelter, said settling chamber (3) being defined by a first ca life (2) arranged on the upper face of the cover (1) and a second cavity in a complementary manner (5) arranged in a cover (4) intended to close said first cavity (2). 2. Internal combustion engine according to claim 1, characterized in that the upstream and downstream ends of the butterfly valve housing are radially surrounded by an O-ring (32, 31) intended to ensure the tightness and maintenance in their position ends in the corresponding openings of the air filter (50) and the intake manifold (23). 3. Internal combustion engine according to claim 1 or 2, characterized in that the distribution cavity (25) of the intake manifold rests directly on the cover (4) that closes the decantation chamber of the crankcase gases arranged in the cover ( 1), and a simple calibrated drill (12) through the bottom wall of the lid (4) that cooperates with a corresponding opening (22) arranged through the bottom wall in front of the distribution cavity (25) allows Recycle the crankcase gases directly to the intake manifold (23). 4. Internal combustion engine according to any one of claims 1 to 3, characterized in that the intake manifold (23) and the butterfly valve housing (30) are fixed directly to the cover (4). 5. Internal combustion engine according to any one of claims 1 to 4, characterized in that the cover (4) integrates, from casting, a ducting element (40) that serves to transfer additional gases to the intake circuit of air, said channeling element (40) at its downstream end by means of a nozzle (41) extending so as to protrude above the cover (4), said nozzle (41) being adapted to penetrate into the distribution cavity (25) of the intake manifold (23) through a corresponding opening (22). 6. Internal combustion engine according to any one of claims 1 to 5, characterized in that the cover (4) integrates a tubular duct element (45) that flows into the settling chamber (3) and is intended to cooperate with an opening corresponding (51) of the air filter (50), allowing said duct element (45) to recycle the crankcase gases directly to the air filter (50).