Engine device
AssigneeYanmar Co., Ltd.
InventorYoshiyuki Sandou
Life of this patent
Estimating the term…
Abstract
In an engine device having a urea mixing pipe which injects urea water into exhaust gas of an engine, and an SCR case which removes nitrogen oxides in the exhaust gas of the engine, and structured such that an inlet side of the SCR case is connected to an outlet side of the urea mixing pipe, the urea mixing pipe is formed by an outer pipe and an inner pipe having a double pipe structure, the SCR case is formed by an inner case body and an outer case body having a double case structure, an exhaust gas outlet side end portion of the outer pipe is connected to an exhaust gas inlet of the inner case body, and an exhaust gas outlet side end portion of the inner pipe is provided in a protruding manner in an inner portion of the SCR case.
Claims20
An engine device comprising:
- a urea mixing pipe configured to inject urea water into exhaust gas of an engine, the urea mixing pipe having:
- an outer pipe defining a channel and comprising an exhaust gas outlet side end portion having a first diameter;
- and
- an inner pipe at least partially disposed within the channel of the outer pipe and comprising an exhaust gas outlet side end portion;
- and
- an SCR case coupled to the urea mixing pipe and configured to remove nitrogen oxides in the exhaust gas of the engine, the SCR case comprising:
- an outer case body defining a cavity;
- and
- an inner case body at least partially disposed within the cavity and defining an exhaust gas inlet opening having a second diameter, the first diameter of the exhaust gas outlet side end portion is greater than the second diameter of the exhaust gas inlet opening;
- and
- wherein the exhaust gas outlet side end portion of the outer pipe is fixed to an outer peripheral surface of the inner case body.
An engine device comprising:
- a urea mixing pipe configured to inject urea water into an exhaust gas, the urea mixing pipe comprising:
- an outer pipe defining a channel;
- and
- an inner pipe at least partially disposed within the channel;
- an SCR case configured to remove nitrogen oxides in the exhaust gas, the SCR case comprising:
- an outer case body defining a cavity;
- and
- an inner case body at least partially disposed within the cavity, the inner case body comprising an inner surface and an outer surface, and defining an opening;
- and
- an SCR inlet pipe comprising:
- a first end coupled to the outer pipe of the urea mixing pipe;
- and
- a second end fixed to the outer surface of the inner case body and interposed between the outer case body and the inner case body.
An engine device comprising:
- a urea mixing pipe configured to inject urea water into an exhaust gas, the urea mixing pipe having:
- an outer pipe defining a channel;
- an inner pipe disposed within the channel defined by the outer pipe, the inner pipe comprising an inside surface and an outside surface;
- an SCR case configured to remove nitrogen oxides in the exhaust gas, the SCR case comprising:
- an outer case body defining a cavity;
- an inner case body disposed within the cavity of the outer case body, the inner case body defining an opening;
- an SCR inlet pipe having a first end coupled to the outer pipe of the urea mixing pipe and a second end coupled the inner case body of the SCR case;
- and
- an extension pipe coupled to the outside surface of the inner pipe of the urea mixing pipe, wherein at least a portion of extension pipe extends through the opening of the inner case body.
Dependencies are inferred from the claim text.