FR2717881A1 - Air purge valve. - Google Patents

Abstract

For an air purge valve fitted to the crankcase of a motor vehicle, according to the invention, it is a question of changing its construction in the region of the exhaust air duct (10) and of the passage thereof. through the valve body (1) so as to enable less expensive manufacture. For this purpose the air purge valve is made of plastic material and the discharge pipe (10, 4) is divided in the region of its passage through the valve body, the part (10) of the discharge pipe disposed at inside the valve body and forming the aforementioned exhaust air duct being produced in the form of a part (5) to be slid into place in a sliding seat.

Description

1 2717881

  The present invention relates to an air purge valve which, intended in particular for the crankcase of a heat engine, comprises a body consisting of a cover and a lower part of the body. , an inlet opening and an outlet opening, the outlet opening

  being in communication with a discharge conduit extends

  inside the body and presenting at this level a seat

  valve age which can be closed by a membrane subjected to atmospheric pressure, which delivery duct is divided, in the region where it passes through the wall of the lower part of the body, into an exhaust air duct

  and an exhaust air manifold.

  Valves of this kind are known in various forms

  embodiments, either separately or in combination with one or more separation functions for separation

oil vapor.

  Thus it is described for example in German patent 3701587 an oil vapor separator associated with a corresponding air purge valve and which has a separation in two phases, the first phase consisting of a synthetic veil or a metallic mesh and the second

phase by a cyclone.

  In the region of the air purge mechanism the air purge valves and the oil vapor separators provided with air purge valves have, for a construction by

  elsewhere, most often an evacuation pipe

  on, controlled by a diaphragm, with a valve seat. No-

  due in particular to the central mounting of the valve seat and the way in which the duct extends outwards, this results in a technically complicated sub-assembly.

and expensive to manufacture.

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  In German patent 3,938,919 a sheet metal oil separator is described with an air purge valve fitted to the

  crankcase and which is divided in the region where the tubing-

  of re discharge through the wall.

  The assembly of the discharge pipe with the seat of

  valve is performed for this air purge valve in

  troduite the discharge pipe obliquely in the valve body and sliding it so that through the opening of the bushing that it protrudes slightly out of the valve body. Then a tubing is introduced from the outside into the discharge conduit. The tubing, the discharge pipe and the valve body are then joined together by brazing. This process is expensive and

laborious.

  The object of the present invention, therefore, is to

  solve the problem of making an air purge valve in the area of the valve seat and the duct

  discharge normally leading to the supply piping

  mission of a heat engine and, in particular, at the level of the passage of the discharge conduit through the wall of the valve body, so that the manufacturing cost

  and mounting is reduced to a minimum.

  This problem is solved, for an air purge valve

  which, intended in particular for the crankshaft of a mo-

  thermal tor, comprises a body consisting of a cover and a lower part of the body, an inlet opening and an outlet opening, the outlet opening being in communication with a discharge duct extending to the inside the body and having at this level a valve seat which can be closed by a membrane subjected to atmospheric pressure, and the delivery duct being divided, in the region where it passes through the wall of the lower part of the body, into an exhaust air duct

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  and an exhaust air pipe, according to the invention by the

  the air purge valve is made of plastic

  that the exhaust air duct of the discharge duct

  It is also integrated into a piece to slide into place, which inside

  lower part of the body is retained in a

  sliding seat, thanks to which a connection is provided

  re to the exhaust air tubing located outside the body, and that the sliding direction is approximately perpendicular to the opening of the body to be closed by

lid.

  In an advantageous embodiment of the invention

  the air purge valve is integrated into an oil separator

  the. Another advantageous characteristic of the air purge valve according to the invention consists in that the sliding seat of the part to be slid into place in the body has a sufficiently reduced tolerance so that at the level of the transition between the duct exhaust air and the

  exhaust air manifold there is no water defect

  chewing affecting the functioning of the valve.

  In another advantageous embodiment of the invention,

  vention it is fitted into the exhaust air pipe-

  partially in the exhaust air duct a tubular section which seals the delivery duct at the connection between the exhaust air tubing

and the exhaust duct.

  Another characteristic of the invention consists in that

  the lower part of the valve body has a guide

  of axial which does not allow to introduce the part to slide in

  place it only in a position which allows to fit the section

  tubular section in the exhaust air duct.

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  The fact of manufacturing the air purge valve in material

  re plastic and make the exhaust air duct with the valve seat as a piece to slide into place

  allows very inexpensive manufacturing and mounting.

  In comparison with the construction methods known in practice and comprising a three-part valve body, the embodiment according to the invention offers the advantage that an external axial joint plane between the exhaust air pipe and the lower part of the body, which until now had to be welded or brazed, is removed and replaced by an internal radial joint plane with a tight fit, but without welding, and that this results in a valve body in two parts. Another advantage of the part to slide in place is that it can be used without change for several different valve bodies

  with, for example, different connection sections.

  The invention is explained in more detail below with the aid of an exemplary embodiment illustrated in the appended drawing in which:

  Figure 1 shows, in cross section, a sou-

  plastic air purge valve with a

integrated separation.

  An air purge valve 1 has a lower part

  valve body 2 with connection tubing

  3, for the intake air coming from a crankcase, and a pipe

  exhaust air bulb 4 for purified exhaust air

  flowing to the intake channel of a heat engine.

  In the lower part 2 of the valve body is

  ve a part 5 to slide into place comprising an exhaust air duct 10, a valve seat 6 concentric with the body and an integrated spring 7. The axial fixing of the part (5) to

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  sliding in place can be accomplished by means of a retaining ring connection. Part 5 is slid into place when

  mounting, axially in the body and present, with a view to

  cheify the exhaust air duct 10 relative to the body 2, a relatively narrow sliding seat in the latter. In addition, the part 5 to be slid into place has a guide, in this case not shown, for example with groove and tongue, passing through the lower part 2 of the body and which does not allow the part 5 to be slid into the body 2

  only in a position that directs the exhaust air duct-

  ment 10 in the direction of the exhaust air pipe 4.

  The joint plane between the exhaust air duct 10

  and the exhaust air pipe 4 can be increased if necessary

  the seal by a tube 12 which, fitted in the exhaust air pipe 4, covers the joint plane and penetrates a few millimeters into the exhaust air duct 10. Depending on the pressure conditions in the casing motor, i.e. a membrane 9 clamped between a cover 9 and the

  valve body 2 closes the valve seat 6, i.e. the valve

  spell 7 can lift the diaphragm 9 from the valve seat 6.

  In the space under part 5 to slide into place is lo-

  separating fluid 11 for oil vapor so

  that the whole construction works as a separa-

oil vapor.

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Claims (5)

  1. Air purge valve which, intended in particular for the crankcase of a heat engine, comprises a body consisting of a cover and a lower body part, an inlet opening and an outlet opening , the outlet opening being in communication with a conduit   of discharge extending inside the body and present   both at this level a valve seat which can be closed by   a membrane subjected to atmospheric pressure, and the   delivery nozzle being divided, in the region where it passes through the wall of the lower part of the body, into a   exhaust air duct (10) and an exhaust air manifold   exhaust (4), characterized in that the air purge valve is made of plastic, in that the exhaust air duct (10) of the discharge duct is integrated in a part (5) to slide in place, which is retained at   inside the lower part (2) of the body in a seat   sliding ge thanks to which it is provided a connection   to the exhaust air pipe (4) located outside   of the body, and in that the sliding direction is approximately perpendicular to the opening of the body to be closed by the cover (8).   2. Air purge valve according to claim 1,   characterized in that it is integrated in an oil separator. 3. Air purge valve according to claim 1 or 2, characterized in that the part sliding seat   (5) to slide into place in the body (2) has a tolerance   rance sufficiently reduced so that at the transition between the exhaust air duct (10) and the exhaust air manifold (4) there is no leakage   affecting the functioning of the valve. 7 2717881   4. Air purge valve according to any of the   previous vendications, characterized in that in the tu-   exhaust air bulb (4) and partially in the con-   exhaust air duct (10) is fitted with a tubular section   the area (12) which seals the discharge duct at the level   calf from the connection area between the exhaust air tubing-   ment (4) and the exhaust air duct (10).   5. Air purge valve according to any one of the   previous vendications, characterized in that the lower part (2) of the body has an axial guide which does not allow   slide the part (5) into place only in a position   putting the fitting of the tubular section (12) in the con- exhaust air duct (10).