Mixer apparatus for an exhaust gas aftertreatment system of a motor vehicle, exhaust gas aftertreatment system, and motor vehicle

A mixer apparatus for an exhaust gas aftertreatment system of a motor vehicle, comprising:

• a housing having an enveloping wall, a first end wall, and a second end wall;
• an injection opening for an exhaust gas aftertreatment agent is embodied in the enveloping wall;
• and
• at least one flow-directing element extending in curved fashion, which directs an exhaust gas flow from at least one inlet opening to an outlet opening embodied in the second end wall, is disposed in the housing, the at least one inlet opening being embodied in the first end wall, the injection opening being configured for mounting of a metering module;
• wherein a rectilinear metering axis, which extends notionally through the metering module and which corresponds to an injection direction of the exhaust gas aftertreatment agent injected into the housing, tangentially contacts, at a contact point, a theoretical cylinder, disposed in the housing, having a variable radius and having a cylinder axis that is congruent with a central axis of the housing, and wherein at least a region of the metering axis extending from the injection opening to the contact point is located, with respect to inflowing exhaust gas, in the shelter of an opening-free region of the first end wall.

An exhaust gas aftertreatment system for a motor vehicle, comprising:

• at least one mixer apparatus, for an exhaust gas flow of an internal combustion engine, a liquid exhaust gas aftertreatment agent being deliverable via the mixer apparatus to the exhaust gas flow, the mixer apparatus including:
• a housing having an enveloping wall, a first end wall, and a second end wall;
• an injection opening for an exhaust gas aftertreatment agent is embodied in the enveloping wall;
• and
• at least one flow-directing element extending in curved fashion, which directs the exhaust gas flow from at least one inlet opening to an outlet opening embodied in the second end wall, is disposed in the housing, the at least one inlet opening being embodied in the first end wall, the injection opening being configured for mounting of a metering module;
• wherein a rectilinear metering axis, which extends notionally through the metering module and which corresponds to an injection direction of the exhaust gas aftertreatment agent injected into the housing, tangentially contacts, at a contact point, a theoretical cylinder, disposed in the housing, having a variable radius and having a cylinder axis that is congruent with a central axis of the housing, and
• wherein at least a region of the metering axis extending from the injection opening to the contact point is located, with respect to inflowing exhaust gas, in the shelter of an opening-free region of the first end wall.

A motor vehicle, comprising:

• an internal combustion engine;
• and
• an exhaust gas aftertreatment system for the internal combustion engine, the exhaust gas aftertreatment system including at least one mixer apparatus, for an exhaust gas flow of the internal combustion engine, a liquid exhaust gas aftertreatment agent being deliverable via the mixer apparatus to the exhaust gas flow, the mixer apparatus including:
• a housing having an enveloping wall, a first end wall, and a second end wall,
• an injection opening for an exhaust gas aftertreatment agent is embodied in the enveloping wall, and
• at least one flow-directing element extending in curved fashion, which directs the exhaust gas flow from at least one inlet opening to an outlet opening embodied in the second end wall, is disposed in the housing, the at least one inlet opening being embodied in the first end wall, the injection opening being configured for mounting of a metering module,
• wherein a rectilinear metering axis, which extends notionally through the metering module and which corresponds to an injection direction of the exhaust gas aftertreatment agent injected into the housing, tangentially contacts, at a contact point, a theoretical cylinder, disposed in the housing, having a variable radius and having a cylinder axis that is congruent with a central axis of the housing, and
• wherein at least a region of the metering axis extending from the injection opening to the contact point is located, with respect to inflowing exhaust gas, in the shelter of an opening-free region of the first end wall.