Patent ID: 9638140
Date: 2017-05-02
CPC Classifications: F02B,F02D,F02M,F16K,Y02T

Claim:
1. A low pressure valve for controlling exhaust gas recirculation in an internal combustion engine comprising: a valve housing configured with a channel section for exhaust gas guidance and a valve element for controlling an exhaust gas passage in the channel section; and an actuating drive in a form of an electromagnetic rotary actuator that is configured for adjusting the valve element and comprises a rotary actuator housing, a coil and a rotor; wherein the rotary actuator housing is mounted on the valve housing; wherein the actuating drive comprises a one-piece element, the one-piece element having a first section embodying a drive shaft and a second section embodying an actuating shaft; wherein the drive shaft is arranged in the rotary actuator housing and is non-rotatably connected to the rotor; wherein the actuating shaft is an extension of the drive shaft such that the actuating shaft extends continuously to the drive shaft, is routed in an extended manner out of the rotary actuator housing, is supported via an end section of the drive shaft contained in the rotary actuator housing and protrudes into the valve housing transversely to a flow direction in the channel section; wherein the actuating shaft engages in the valve housing at the valve element in a non-rotatable manner and is rotationally adjusted about an axis in order to actuate the valve element; wherein the valve element is formed of a circular flap having edge regions on both sides of an axis of the actuating shaft; wherein the valve housing comprises axial stop surfaces that are planar and face the flow direction in the channel section; wherein the circular flap, in a closed position, is positioned transversely to the channel section and bears against the axial stop surfaces via the edge regions; wherein the end section of the drive shaft is supported by a radial bearing and by an axial bearing; wherein the radial bearing and the axial bearing both are arranged in the rotary actuator housing; and wherein the axial bearing is a ball bearing that is arranged between the coil and the rotor of the electromagnetic rotary actuator.