Exhaust gas sensor and outboard motor engine installed with the same

Patent metadata

Field	Value
Publication number	US-2017107888-A1
Application number	US-201615278493-A
Country	US
Kind code	A1
Filing date	Sep 28, 2016
Priority date	Oct 15, 2015
Publication date	Apr 20, 2017
Grant date	—

Abstract

A tubular protector provided with a basal end side installed in a casing to cover an oxygen concentration detector has a tubular portion configured to house a detecting portion of the oxygen concentration detector in a bottomed hollow formed by blocking a tip side thereof, and an extension configured to extend from a bottom of the tubular portion to a tip and provided with a plurality of channels each communicating with an inner side of the tubular portion and having an exhaust gas inlet port opened outward in a radial direction.

First claim

What is claimed is:

1 . An exhaust gas sensor comprising:
a casing installed in the middle of a flow path of an exhaust pipe; an oxygen concentration detector installed in the casing and configured to detect an oxygen concentration of an exhaust gas flowing through the flow path; and a tubular protector having a basal end side installed in the casing to cover the oxygen concentration detector, wherein the protector has
a tubular portion configured to house a detecting portion of the oxygen concentration detector in a bottomed hollow formed by blocking a tip side of the protector, and
an extension configured to extend from a bottom of the tubular portion to a tip and provided with a plurality of channels each communicating with an inner side of the tubular portion and having an exhaust gas inlet port opened outward in a radial direction.

2 . The exhaust gas sensor according to claim 1 , wherein the extension has a cylindrical tip formed in a conical shape, and
the inlet ports are opened on a circumferential surface of the conical shape.

3 . The exhaust gas sensor according to claim 1 , wherein the casing has a male thread portion formed in an outer circumference of a stepped tubular holder of the tip side for installation in the exhaust pipe, and
the protector is provided with at least three channels in the extension.

4 . The exhaust gas sensor according to claim 1 , wherein the protector is detachably installed in the casing and serves as an attachment for connecting the casing and the exhaust pipe to each other.

5 . An outboard motor engine comprising:
a crankshaft having an axial line oriented in a vertical direction; a plurality of cylinders arranged vertically overlappingly; an exhaust flow path formed to extend from a combustion chamber in a horizontal direction and then be bent downward for discharging an exhaust gas to water; and an exhaust gas sensor provided with
a casing installed in the middle of a flow path of an exhaust pipe,
an oxygen concentration detector installed in the casing and configured to detect an oxygen concentration of an exhaust gas flowing through the flow path, and
a tubular protector having a basal end side installed in the casing to cover the oxygen concentration detector, the protector being approximately in parallel with an exhaust pipe directed downward while a tip side of the protector being directed downward in the flow path of the bend portion of the exhaust flow path,
wherein the protector has
a tubular portion configured to house a detecting portion of the oxygen concentration detector in a bottomed hollow formed by blocking a tip side of the protector, and
an extension configured to extend from a bottom of the tubular portion to the tip and provided with a plurality of channels each communicating with an inner side of the tubular portion and having an exhaust gas inlet port opened outward in a radial direction.

Assignees

• Suzuki Motor Corp

Inventors

• Muramatsu Go
• Nishio Masaya

Classifications

• F01N13/008

  Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439) · CPC title

• F01N13/004 Primary

  specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water (for submerged exhausting F01N13/12; treating exhaust by using liquids F01N3/04) · CPC title

• F02B61/045

  for marine engines · CPC title

• F01N2560/025

  for measuring or detecting O2, e.g. lambda sensors · CPC title

• F01N2590/021

  for outboard engines · CPC title