FR2889255A1 - Exhaust gas recirculation valve for engine compartment, has valve body comprising inlet port and outlet port, which is provided with obturation valve, and actuator disposed at exterior of valve body - Google Patents

Abstract

The valve has a valve body (1) comprising an inlet port (2) and an outlet port (3), which is provided with an obturation valve (4). The obturation valve is associated to a drive unit (7) connected to an actuator (12). The actuator is disposed at the exterior of the body and comprises a part extending through a wall of the body and another part equipped with a sealed case (13) mounted on the wall in a sealed manner.

Description

The present invention relates to a gas recirculation valve

exhaust.

  BACKGROUND OF THE INVENTION It is known that an exhaust gas recirculation valve is used to reinject part of the exhaust gas into the intake in order to reduce the polluting emissions.

  Given the positioning of the exhaust gas recirculation valve in the engine compartment, it is desirable that it be sealed.

  In general, a recirculation valve comprises a valve body comprising an inlet orifice and an outlet orifice, the outlet orifice being provided with a closure member associated with a transmission member connected to a control motor of the shutter member.

  In known devices, the control motor is disposed within the valve body which is closed by a cover sealingly mounted on the valve body. The valve body is generally made by casting so that in order to have the control motor inside the valve body it is necessary to make a relatively complex casting piece and therefore expensive.

  OBJECT OF THE INVENTION The object of the invention is to provide a simplified casting to form the valve body of an exhaust gas recirculation valve.

  SUMMARY OF THE INVENTION The invention starts from the observation that has never been exploited until now, that there are engines equipped with a sealed housing and that it is also easy to carry out by stamping a crankcase. in which an electric motor can be inserted.

  According to the invention, the control motor is placed outside the valve body and comprises a portion extending through a wall of the valve body and a part equipped with a sealed housing mounted in a sealed manner on the wall of the valve body.

  Thus, while realizing a totally sealed assembly, it is possible to produce a simplified structure valve body comprising for example a flat wall provided with a simple opening through which extends a portion of the control motor.

  According to one embodiment of the invention, the sealed casing of the control motor extends through the wall and the seal with the valve body is ensured by an annular seal embedded in the wall of the valve body and surrounding the casing. waterproof.

  In another embodiment, the sealed casing of the control motor is sealingly surrounded by an annular flange sealingly attached to the valve body outside thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

  Other features and advantages of the invention will become apparent on reading the following description of two particular non-limiting embodiments of the invention with reference to the accompanying figures in which: FIG. 1 is a diagrammatic view of a first embodiment, in section through a plane passing through an axis of symmetry of the shutter member and the control motor.

  - Figure 2 is a schematic sectional view similar to that of Figure 1 of a second embodiment of the invention.

  DETAILED DESCRIPTION OF THE INVENTION

  With reference to FIG. 1, the illustrated exhaust gas recirculation valve comprises a valve body 1, preferably in the form of a casting, having an inlet port 2 and an outlet port 3 provided with a shut-off valve 4 whose control rod 5 is connected to a transmission member 7 by passing through an intermediate wall 6 sealingly separating the compartment comprising the transmission member 7 of the compartment comprising the inlet orifice 2 and the outlet orifice 3. The passage of the intermediate wall 6 by the valve stem 5 is sealed by an O-ring 8 embedded in a groove formed in a boss 9 of the intermediate wall 6.

  The valve body compartment containing the transmission member 7 is sealingly closed by a cover 10 provided with a seal 11 and secured to the valve body by bolts or screws not shown.

  The transmission member 7 is connected to a control motor 12 powered in a manner known per se by a not shown connector integrated into the cover. According to the invention, the control motor 12 is disposed outside the valve body 1 and is equipped with a sealed housing 13. A portion of the control motor 12 extends through a wall of the valve body.

  In the embodiment of Figure 1, a seal between the sealed housing 13 and the wall of the valve body is provided by an O-ring 15 mounted in a groove made in a bore 16 extending through the wall.

  When mounting the control motor 12, the O-ring 15 surrounds the sealed casing 13 and bears thereon to seal between the sealed casing 13 and the valve body 1. The control motor 12 is fixed to a counterplate 17 itself 30 fixed inside the valve body by screws not shown.

  In the embodiment of Fig. 2, the structure of the exhaust gas recirculation valve is generally the same as in the embodiment of Fig. 1, and like reference numerals have been given for parts thereof. identical to those described with reference to Figure 1. In this embodiment the motor comprises a non-leakproof housing 18 and is mounted in a sealed housing 21, for example by press fitting into the housing or by overmolding the housing on the housing 18. The sealed casing 21 comprises a flange 22 which bears on the external face of the valve body 1 being fixed thereto by screws 19.

  The seal between the sealed housing 21 and the valve body 1 is this time provided by an O-ring 20 mounted in an annular groove surrounding the motor 12 and extending in one face of the flange 22 facing the outer face of the the wall of the valve body 1.

  Of course, the invention is not limited to the embodiments described and variants can be made without departing from the scope of the invention as defined by the claims.

  In particular, although the invention has been described in connection with a recirculation valve having a valve member in the form of a valve, the invention is also applicable to recirculation valves having a pivoting closure member or a rotary shutter disk suitably connected to a control motor via a control member and a transmission member.

  Although the invention has been described in connection with a valve body having an intermediate partition 6 sealingly traversed by the valve stem 5 so as to separate a sealed compartment containing all of the actuating members of the valve member. The shutter member, and a compartment through which the exhaust gas flows, can be provided with a valve body comprising a single compartment containing both the control members and the shutter members.

Claims (4)

  An exhaust gas recirculation valve having a valve body (1) comprising an inlet port (2) and an outlet port (3), the outlet port being provided with a closure member (4) associated with a transmission member (7) connected to a control motor (12) of the closure member (4), characterized in that the control motor (12) is arranged externally valve portion (1) and has a portion extending through a wall of the valve body and a portion equipped with a sealed housing (13,21) sealingly mounted on the wall of the valve body.   2. Valve according to claim 1, characterized in that the valve body (1) comprises an intermediate wall (6) through which is sealed by a control member (5) of the closure member.   Valve according to claim 1, characterized in that the sealed casing (13) of the control motor (12) extends through the wall of the valve body, and the sealing with the valve body is ensured by a annular seal (15) embedded in the wall of the valve body and surrounding the sealed casing (13).   4. Valve according to claim 1, characterized in that the sealed housing (21) of the control motor (12) comprises an annular flange (22) sealingly attached to the valve body outside thereof.