Reducing agent pump for an exhaust-gas aftertreatment system of an internal combustion engine
AssigneeArgillon GmbH
InventorSonja Lenke
Life of this patent
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Abstract
A reducing agent pump has a pump inlet part and a pump outlet part closing off the pump body at its ends. One or both of the inlet and outlet parts is of two-part construction, with a closure element and another element. The two elements are prestressed relative to one another with a spring element, so that in the event of a pressure which exceeds the spring force of the spring element, a relative movement can be carried out between the two elements of the two-part member. This makes it possible to absorb an increase in the volume of the reducing agent inside the pump body caused by freezing and therefore to prevent damage to the reducing agent pump.
Claims8
A reducing agent pump for delivering liquid reducing agent to an exhaust-gas aftertreatment system of an internal combustion engine, comprising;
- a cylindrical pump body;
- a coil carrier surrounding said pump body and serving to receive an electromagnet;
- a piston disposed to execute an axial movement in said pump body when said electromagnet is being energized;
- a pump inlet part and a pump outlet part closing off said pump body at respective ends thereof, each of said inlet part and said outlet part having a central flow passage, at least one of said pump inlet part and said pump outlet part forming a two-piece part having a first element including said central flow passage and a closure element which is fixedly mounted;
- and
- a spring element disposed to bias said first element relative to said closure element and to allow a relative movement between said first element and said closure element when a pressure exceeds a spring force of said spring element.
Dependencies are inferred from the claim text.