DE7822216U1 - Pressure control valve for installation in a vent line of an internal combustion engine - Google Patents

Description

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20-. - July 1978

Applicant: PILTERWERK MANN & HUMMEL GMBH, Hindenburgstr. 37 - 45, 71 ^ 0 Ludwigsburg

File I8O7

Pressure control valve for installation in a vent line of an internal combustion engine

The invention relates to a pressure control valve for installation in a vent line of an internal combustion engine according to the preamble of claim 1.

Erit ventilation valves of this type are used in the ventilation lines, for example between the crankcase and the intake line or between the fuel tank and the intake line. In both cases, they are used to keep the pressure or negative pressure in the containers below the required maximum permissible | Increase in value. i,

For the practical operation of such pressure control valves on an internal combustion engine, splash protection plays a significant role. The penetration of water must in fact un- ^r are dingt avoided v / eil otherwise would impair the function.

File I8O7

In practical operation, pressure regulating valves were used for installation in the ventilation line between the crankcase and the intake line an internal combustion engine is known in which the ventilation duct opens out through a top of the housing cover Bore is formed. Sufficient splash protection cannot be guaranteed with such a ventilation duct.

Other known constructions use for the splash protection of the likewise after ouen from the housing cover opening ventilation channel a labyrinth, which is created by additional parts.

The object of the invention is to improve the pressure control valve indicated at the beginning with simple means in such a way that that on the one hand the ventilation can take place undisturbed and on the other hand that water can penetrate into the ventilation chamber is sure to be avoided.

The object is achieved according to the invention with the features of the characteristic of claim 1 achieved.

The ventilation duct, which is now provided with a kink, can be easily produced during the injection molding of the plastic parts has an excellent effect as a splash protection.

In order to make the penetration of spray water more difficult, it is proposed in an embodiment of the invention that the outer Opening of the housing opening in a wall section extending horizontally or sloping radially from the inside to the outside of the lower housing part is arranged.

The assembly of the housing cover with the lower housing part is facilitated by the fact that the housing cover is on the outer circumference has a radially outwardly projecting tongue which

1807 file

to fix its angular position engages in a recess in the free edge of the lower housing part surrounding it.

The tongue is expediently arranged in the area of the radial groove.

An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. Show it

Figure 1 is a pressure control valve in axial section,

FIG. 2 shows the pressure control valve of FIG. 1 in a view from above

Figure 3 shows a section along the line 3-3 of Figure 1 and

FIG. 4 shows a section along the line 4-4 in FIG.

The exemplary embodiment is for installation in a ventilation line between the crankcase and the intake line of an internal combustion engine certainly.

A pressure control valve 1 has a valve housing 2 made of plastic, which consists of a cup-shaped lower housing part 3 and a through Welding attached to it housing cover 4 is assembled. The inflow connection 5 opens into the lower housing part 3, that in the assembled state of the pressure control valve via a hose line to the crankcase of an internal combustion engine connected is. A drain connection 6 opens out from the bottom of the lower housing part 3 in the middle and is angled to the side. That central The connector end arranged within the valve housing 2 is designed as a valve seat 7. In the assembled state, the drainage nozzle has 6 via a hose line with the intake pipe of an internal combustion engine connection.

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icts 1807

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The lower housing part 3 has an annular groove 11 open to the housing cover 4 on its free edge 10. A diaphragm valve body 13 is clamped with its thickened edge 14 in a sealed manner in the annular groove 11 by an annular bead 19 of the housing cover 4. The diaphragm valve body 13 divides the valve housing 2 into a valve chamber 15 and a ventilation chamber 16 which, in a manner to be described in more detail below, is connected to the atmosphere via a ventilation channel 20. A return spring 17 is supported with one end face on the bottom of the lower housing part 3 and, at the other end against the diaphragm valve body 13 at ₃ to them in corresponding pressure conditions, for example at standstill of the connected internal combustion engine, in the drawn in figure 1 shown position presses. The other end position is shown in dashed lines, in which a central part of the diaphragm valve body 13 rests against the valve seat 7 and closes the valve opening 9.

As can be seen from FIGS. 1 and 2, the housing cover 4 has an outwardly protruding tongue 30 which is inserted into a recess 31 of the free edge 10 of the lower housing part surrounding it engages. In this way, the housing cover 4 is opposite to the Lower housing part 3 fixed in its angular position.

The annular bead 19 of the housing cover 4 is provided with a radial groove 21. The lower housing part 3 has on the outer circumference 12 of the Annular groove 11 an axial groove 22 which is open to the outside via a housing opening 23 at the lower end. The thickened edge 14 of the diaphragm valve body 13 covers the radial groove 21 and the axial groove 22. Radial groove 21 and axial groove 22 go into one another over and form together with the thickened edge 14 of the diaphragm valve body 13 and with the housing opening 23 the ventilation channel 20.

As can be seen from Figure 1, the outer mouth of the housing opening 23 in a horizontally extending wall

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File I8O7

section 24 of the lower housing part 3 is arranged. if required this wall section could also drop radially from the inside to the outside, making it even less for splash water would be accessible.

The tongue 30 is arranged in the area of the radial groove 21 in order to the position of the ventilation channel 20 can also be seen from above.

The cross-sections of the pressure regulating valve 1 and the compressive force of the return spring 17 are chosen so that the valve opening 9 remains open until the maximum permissible negative pressure in the valve chamber 15 and thus in the crankcase of the internal combustion engine is reached. As the pressure in the valve chamber 15 falls further, those on the diaphragm valve body 14 predominate occurring forces · the force of the return spring 17, and the Diaphragm valve body 14 is in. Until it rests on valve seat 7 moves the position shown in dashed lines in Figure 1. In this way, the blow-by gases are extracted from the crankcase regulated in the intake pipe of the internal combustion engine so that the crankcase pressure does not fall below the predetermined value .

Claims (3)

File I8O7 Claims 1. Pressure control valve for installation in a ventilation line of an internal combustion engine, for example between the crankcase and suction line, with a valve housing made of plastic ^g material that consists of a cup-shaped housing base and a q The housing cover is assembled and on the lower part of the housing has an annular groove open towards the housing cover, with an inflow connection opening into the housing lower part and a drain opening out of the lower housing part nozzle, the nozzle end of which is arranged centrally within the valve housing and is designed as a valve seat, as well as with a diaphragm valve body clamped in a sealed manner at its thickened edge in the annular groove by the housing cover, which connects the valve housing into a valve chamber and one connected to the atmosphere via a ventilation duct Ventilation chamber divided, with the valve seat cooperates and the valve opening at a predetermined negative pressure in the valve chamber against the force a return spring closes, characterized in that the housing cover (4) in its angular position opposite the lower housing part (3) is fixed and has a radial groove (21) on its inside, which in one at the lower end Axial groove (22) which is open to the outside via a housing opening (23) and is arranged on the outer circumference (12) of the annular groove (11) passes, the radial groove (21) and axial groove (22) together with the thickened edge (14) of the diaphragm valve body (13) and the housing opening (23) the ventilation duct (20) form. File 18O7 2. Pressure control valve according to claim I _3, characterized in that the outer mouth of the housing opening (23) is arranged in a horizontally extending or radially from the inside to the outside sloping wall section (2 ^) of the lower housing part (3). 3. Pressure control valve according to claim 1 or 2, characterized in that that the housing cover (4) has a has radially outwardly protruding tongue (30) which for fixing its angular position in a recess (31) engages the free edge (10) of the lower housing part (3) surrounding it. k. Pressure control valve according to Claims 3 _3, characterized in that the tongue (30) is arranged in the area of the radial groove (21).