US 11,913,412 B2Granted

EGR valve and EGR valve device provided with same

AssigneeAisan Kogyo Kabushiki Kaisha

InventorsNaoya Suzuki, Koichi Sugihara

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Abstract

A poppet-type EGR valve includes: a housing that includes a flow passage; a valve seat; a valve body allowed to be seated on the valve seat; a valve shaft on which the valve body is provided at one end section thereof; and a drive unit reciprocally driving the valve shaft. The flow passage has an inlet and an outlet and includes a bent passage portion that is bent downstream from the valve seat in a direction perpendicular to the direction toward the inlet. The bent passage portion includes at least one of a section in which the passage area is constant and a section in which the passage area increases toward the downstream direction, and does not include a section in which the passage area decreases toward the downstream direction. In the section in which the passage area increases toward the downstream direction, the passage area changes gradually.

Claims16

Dependent claims

An EGR valve of a poppet type comprising:

a housing including a passage for EGR gas;
a valve seat provided in the passage, the passage having an inlet and an outlet and including a bent passage portion bent orthogonally with respect to a direction toward the inlet downstream of the valve seat, the bent passage portion extending from a horizontal plane above the valve seat to a vertical plane that is perpendicular to the horizontal plane;
a valve shaft that passes through the bent passage portion on a downstream side of the valve seat;
a drive unit to reciprocally drive the valve shaft;
and
a valve element connected to one end of the valve shaft and configured to be seated on the valve seat;
wherein at each succeeding position of the bent passage portion in a downstream direction, a passage area of the bent passage portion, excluding a sectional area of the valve shaft at that position if the valve shaft passes through the passage area at that position, either (i) is kept constant relative to a preceding position of the bent passage portion or (ii) increases relative to a preceding position of the bent passage portion.

4 more elements

Dependencies are inferred from the claim text.