FR2904376A1 - Air intake manifold for internal combustion engine i.e. oil engine, of motor vehicle, has chamber situated below ramp that supplies injectors, where chamber includes compartments connected by pipes to define spaces for passing cams - Google Patents

Abstract

The manifold (1) has a vacuum chamber (2) situated below a common pressurized ramp (3) that supplies injectors of an internal combustion engine i.e. oil engine, of a motor vehicle. The chamber has compartments that are connected to each other by connecting pipes to define spaces between the compartments for permitting a passage of cams of a camshaft. The chamber is closed at its lower part by an obturation cover (8) that is overmolded on the manifold with interposition of a sealing joint (9).

Description

The present invention relates to an intake manifold for a

  internal combustion engine of a motor vehicle, in particular a diesel engine. Car manufacturers are constantly striving to obtain engines that are as compact as possible so as to optimally use the available volume. For this purpose, it has already been proposed to mount an oil separator at the upper part of the engine, in particular by integrating it with the intake manifold of the air.

Such an oil separator must, however, have a relatively large volume and a compact shape, so that the available volume is frequently insufficient, particularly in the case of diesel engines in which this volume must be located below the ramp. under pressure supplying the injectors.

It is an object of the present invention to overcome this disadvantage by providing an intake manifold designed to allow optimum use of the available volume at the top of an internal combustion engine. According to the invention, such an intake manifold is characterized in that it is equipped with a vacuum chamber integrated therewith. A vacuum chamber indeed has compared to an oil separator the advantage of not having to have a compact shape and require only a smaller volume. The vacuum chamber can therefore be located below the common rail supplying the injectors of a die-salt engine. According to the invention, the vacuum chamber may advantageously be constituted by a series of compartments interconnected by connection pipes so as to allow the camshaft cams to pass between these compartments. According to another characteristic of the invention, the different compartments of the vacuum chamber and the connection pipes are closed by a closure cap at their lower part. According to the invention, the vacuum chamber is essentially constituted firstly by a series of bosses made in the intake manifold as a function of the volume available above this manifold and each corresponding to a compartment. on the other hand by a series of corresponding bosses made in the shutter box and also having a depth dependent on the available volume. According to the invention, the closure cap is preferably constituted by a molded element on the intake manifold with in-position of a seal. The characteristics of the intake manifold which is the subject of the invention will be described in more detail with reference to the appended nonlimiting drawings in which: FIG. 1 is a top view of the intake manifold; Figure 2 is a cross-section of the intake manifold, Figure 3 is a bottom view of the intake manifold, Figure 4 is a partial section of the manifold showing a top view of the closure hood. According to FIGS. 1 and 2, the intake manifold 1 is equipped with a vacuum chamber 2 integrated therewith. This vacuum chamber is located below the common rail 3 which supplies the injectors. According to FIGS. 3 and 4, the vacuum chamber 2 is constituted by a series of compartments 4 interconnected by connecting tubes 5 so as to define between the different compartments 4 spaces 6 allowing the passage of the cams the camshaft which is not shown in the figures. The vacuum chamber 2, which thus does not have a compact shape, makes it possible to optimally exploit the entire available volume above the engine. According to Figures 1 and 2, the vacuum chamber 2 is delimited at its upper part by a series of bosses 7 made in the intake manifold 1 depending on the available volume. Each of these bosses 7 corresponds to a compartment 4. According to FIGS. 2, 3 and 4, the vacuum chamber 2 is closed at its lower part by a closure hood 8 molded onto the intake manifold 1 with interposition of A seal 9. The closure cap 8 has a geometry corresponding to that of the bosses 7 of the intake manifold 1 and also includes a series of bosses whose depth is also a function of the available volume.

Claims (3)

  1) intake manifold for an internal combustion engine of a motor vehicle, in particular a diesel engine characterized in that it is equipped with a vacuum chamber (2) integrated therewith. 2) intake manifold according to claim 1, characterized in that the vacuum chamber (2) is located below the pressure ramp (3) supplying the injectors. 3) intake manifold according to any one of claims 1 and 2, characterized in that the vacuum chamber (2) is constituted by a series of compartments (4) interconnected by connection pipes (5) in order to allow the passage of the cams of the camshaft between these compartments (4). 4) intake manifold according to any one of claims 1 to 3, characterized in that the different compartments (4) of the vacuum chamber (2) and the connecting pipes (5) are closed by a hood shutter 25 (8) at their lower part. 5) intake manifold according to claim 4, characterized in that the closing cap (8) is constituted by a molded element on the neck-30 inlet reader (1) with interposition of a seal (9).