AU2008201204A1 - Exhaust gas sensor installation structure for four-cycle engine - Google Patents

Exhaust gas sensor installation structure for four-cycle engine Download PDF

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Publication number
AU2008201204A1
AU2008201204A1 AU2008201204A AU2008201204A AU2008201204A1 AU 2008201204 A1 AU2008201204 A1 AU 2008201204A1 AU 2008201204 A AU2008201204 A AU 2008201204A AU 2008201204 A AU2008201204 A AU 2008201204A AU 2008201204 A1 AU2008201204 A1 AU 2008201204A1
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AU
Australia
Prior art keywords
sensor
cylinder head
exhaust gas
main body
guard
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Granted
Application number
AU2008201204A
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AU2008201204B2 (en
Inventor
Katsuya Abe
Takeshi Kanae
Koji Okamoto
Mamoru Otsubo
Chikashi Takiguchi
Yohei Yamauchi
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Publication of AU2008201204A1 publication Critical patent/AU2008201204A1/en
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Publication of AU2008201204B2 publication Critical patent/AU2008201204B2/en
Ceased legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
    • F02B77/086—Sensor arrangements in the exhaust, e.g. for temperature, misfire, air/fuel ratio, oxygen sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Exhaust Silencers (AREA)

Description

S&F Ref: 841036
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: The following statement is a full performing it known to me/us: Honda Motor Co., Ltd., of 1-1, Minami Aoyama 2-chome, Minato-ku, Tokyo, 107-8556, Japan Koji Okamoto, Yohei Yamauchi, Chikashi Takiguchi, Takeshi Kanae, Katsuya Abe, Mamoru Otsubo Spruson Ferguson St Martins Tower Level 31 Market Street Sydney NSW 2000 (CCN 3710000177) Exhaust gas sensor installation structure for four-cycle engine description of this invention, including the best method of 5845c(1164778_1) 00 O EXHAUST GAS SENSOR INSTALLATION STRUCTURE FOR FOUR-CYCLE ENGINE STechnical Field The present invention relates to an exhaust gas sensor installation structure for a four-cycle engine in which an exhaust gas sensor is installed in a cylinder head of an engine main body, the exhaust gas sensor including a sensor main part an end portion of Swhich is exposed in an exhaust port and a cap which is fitted to a rear portion of the sensor main part and from a side of which a cord extends.
00 Background Art S 10o There have been exhaust gas sensor installation structures, for example, one disclosed in JP-A No. 2004-316430, in which an exhaust gas sensor is installed in a portion around an exhaust port of a cylinder head.
An exhaust gas sensor has a cap, from a side of which a cord extends. In the installation structure described in JP-A No. 2004-316430, the direction in which a cord extends from an exhaust gas sensor is not fixed when the exhaust gas sensor is installed in a cylinder head. This poses a problem in terms of handling the cord.
It is desirible to provide an exhaust gas sensor installation structure for a fourcycle engine wherein, when the exhaust gas sensor is installed in a cylinder head, the direction in which a cord extends from the exhaust gas sensor is fixedly defined to facilitate handling of the cord.
Summary of the Invention The present invention provides an exhaust gas sensor installation structure for a four-cycle engine, in which an exhaust gas sensor is installed in a cylinder head of an engine main body, the exhaust gas sensor comprising a sensor main part an end portion of which is exposed in an exhaust port and a cap which is fitted to a rear portion of the sensor main part and from a side of which a cord extends; wherein: a sensor installation hole for installing the sensor main part is provided in a portion around the exhaust port of the cylinder head; the cap is at least partly covered by a sensor guard fixedly positioned relative to the cylinder head; and a direction in which the cord extends is fixedly defined by the sensor guard relative to the cylinder head.
Preferably, the sensor guard formed discretely from the engine main body is attached to the exhaust gas sensor such that the sensor guard engages with a positioning part provided on the engine main body.
I 158848-[1hok 00
O
0 Still preferably, the sensor guard integrally includes a sensor positioning part having an engaging part to engage with the positioning part provided on the engine main body and covering the cap; a cover part formed continuously with the sensor positioning part such that the cover part covers an outer open end of an air passage communicating with an interior of the sensor main part and opening in an outer surface of the cap; and a cord positioning part formed continuously with the sensor positioning part such that the cord positioning part defines a direction in which the cord extends.
The positioning part provided on the engine main body may include two adjacent Sones of a plurality of cooling fins projectedly formed on an outer circumference of the 00
OO
io cylinder head.
(N The sensor guard may be formed integrally with the cylinder head or a head cover included in the engine main body.
The engine main body may be mounted on a motorcycle such that a side where the exhaust port is provided of the cylinder head faces forward; and the sensor guard is formed to cover the cap from a front side.
The oxygen sensor used in the following embodiments corresponds to the exhaust gas sensor according to the present invention.
The direction in which the cord extends from the cap of the exhaust gas sensor installed in the sensor installation hole provided in a portion around the exhaust port of the cylinder head is fixedly defined by the sensor guard fixedly positioned relative to the cylinder head. Thus, the direction in which the cord extends is fixedly defined with the exhaust gas sensor protected by the sensor guard, so that the cord can be handled with ease.
The sensor guard formed discretely from the engine main body is attached to the exhaust gas sensor such that it engages with the positioning part provided on the engine main body. This improves workability in attaching the sensor guard, in a fixed position relative to the cylinder head, to the exhaust gas sensor.
The outer open end of the air passage is covered by the cover part of the sensor guard. Therefore, the sensor guard can prevent foreign matter such as dust and water from entering the exhaust gas sensor via the air passage, and the direction in which the cord extends can be easily defined by the cord positioning part formed continuously with the sensor positioning part engaged with the positioning part provided on the engine main body.
Il58848-I:hok 00 8 No special part for positioning the sensor guard relative to the cylinder head is required, so that the position of the sensor guard can be defined without causing an increase in the number of components required.
Cc The sensor guard is formed integrally with the cylinder head or the head cover, s so that the number of components required and the number of man-hours required for installing the sensor guard can be reduced.
SThe exhaust gas sensor can be protected against objects coming flying from the front of the motorcycle.
00 Brief Description of the Drawings Preferred embodiments of the present invention will be described below with reference to the attached drawings. Figs. 1 to 8 show a first embodiment of the present invention.
Fig. 1 is a side view of an essential part of a motorcycle.
Fig. 2 is an enlarged view of an essential part of Fig. 1.
Fig. 3 is an enlarged cross-sectional view taken along line 3 3 in Fig. 2.
Fig. 4 is a perspective view in the direction of arrow 4 in Fig. 2.
Fig. 5 is a perspective view corresponding to Fig. 4 with no sensor guard.
Fig. 6 is a perspective view of a sensor guard.
Fig. 7 is a perspective view of the sensor guard in the direction of arrow 7 in Fig.6.
Fig. 8 is an enlarged cross-sectional view of the sensor guard taken along line 8 8 in Fig. 3.
Fig. 9 is a perspective view, from diagonally below, of a cylinder head and a head cover included in an engine main body according to a second embodiment.
Fig. 10 is a perspective view, from diagonally above, of the cylinder head and the head cover included in the engine main body.
Fig. 11 is a perspective view, from diagonally above, of a cylinder head according to a third embodiment.
Fig. 12 is a perspective view of a part of the cylinder head as seen from diagonally above at an angle different from that of Fig. 1 1.Fig. 1 is a side view of an essential part of a motorcycle.
Detailed Description of Preferred Embodiments Referring to Fig. 1, a body frame F of the motorcycle includes a main frame extending rearwardly and downwardly from a head pipe (not shown) provided in a front I 158848-I:hok 00 end portion of the motorcycle. A power unit P including a water-cooled four-cycle engine E and a transmission system T which continuously varies the output of the engine E and Senables deceleration is disposed below and suspendedly supported by the main frame Referring also to Fig. 2, an engine main body 16A of the engine E included in the power unit P includes a crankcase 17, a cylinder block 18 coupled, in a forwardly tilted position, to an upper front portion of the crankcase 17, a cylinder head 19A coupled Sto an upper portion of the cylinder block 18, and a head cover 20A coupled to the cylinder head 19A.
00 As shown in Fig. 1, an intake system 22 having, at an upstream end thereof, an 00 air cleaner 21 disposed rearward of the engine main body 16A is connected to an intake N port (not shown) which is open in a rear side of the cylinder head 19A. An exhaust connection pipe section 24 forming a forwardly open exhaust port 23 is projectedly provided on a front side of the cylinder head 19A. An exhaust pipe 25 communicated with the exhaust port 23 is connected to the exhaust connection pipe section 24. The Is cylinder head 19A has a spark plug 26 fitted thereto from the right side thereof. A radiator 27 disposed forward of the engine main body 16A is supported by the main frame Referring also to Figs. 3 to 5, an oxygen sensor 28 is installed, as an exhaust gas sensor, in the cylinder head 19A such that it can detect the oxygen concentration in the exhaust gas flowing through the exhaust port 23. To allow the oxygen sensor 28 to be installed, the cylinder head 19A is provided with a sensor installation hole 29 formed around the exhaust port 23. In the present embodiment, the sensor installation hole 29 is provided in the right side of the exhaust connection pipe section 24 forming the exhaust port 23.
The oxygen sensor 28 includes a sensor main part 31 and a cap 32 removably fitted to a rear portion of the sensor main part 31. The sensor main part 31 has a housing which is attached to the cylinder head 19A by having an end portion thereof screwed in the sensor installation hole 29. The sensor main part 31 is installed in the cylinder head 19A with an end portion thereof exposed in the exhaust port 23.
The housing 30 is shaped cylindrically. It has an engaging part 30a provided in an axial intermediate portion thereof, the engaging part 30a radially outwardly projecting so that it can engage with a rotary tool and having, for example, a hexagonal crosssectional shape. A male thread 33 to be screwed in the sensor installation hole 29 that is a threaded hole is formed on the external surface of a portion of the housing 30, the portion being closer to the end of the housing 30 than the engaging part I 1I58848-1:hok 00 The cap 32 is made of an elastic material, for example, rubber and integrally includes a bottomed cylindrical part 32a which is elastically fitted to a rear portion of the housing 30 included in the sensor main part 31 and a pair of cylindrical projections 32b Cc and 32c laterally projecting from a rear portion of the bottomed cylindrical part 32a. The projections 32b and 32c have an axis disposed over and along a diameter line of the bottomed cylindrical part 32a and project to upward and downward sides, respectively, Sfrom the rear portion of the bottomed cylindrical part 32a.
Of the projections 32b and 32c, the projection 32b downwardly projecting from 00 the bottomed cylindrical part 32a forms an air passage 34 for leading air into the sensor 00 1o main par 31. The air passage 34 is open at an outer end of the projection 32b, in the external surface of the cap 32. Of the projections 32b and 32c, the projection 32c upwardly projecting from the bottomed cylindrical part 32a is connected with a cord extending sidewardly therefrom. A connection terminal 36 provided in the cap 32 continuously with the cord 35 is electrically connected to a connection terminal 37 provided on the sensor main part 31 side when the cap 32 is fitted to the rear portion of the main sensor part 31. The cord 35 extends to a side opposite to the side where the air passage 34 is open, upwardly from a rear side of the oxygen sensor 28, from a side of the cap 32.
The cap 32 of the oxygen sensor 28 is, at least partly, covered by a sensor guard 40 fixedly positioned relative to the cylinder head 19A. The direction in which the cord extends from the oxygen sensor 28 is fixedly defined relative to the cylinder head 19A by the sensor guard 40. The sensor guard 40 is formed discretely from the engine main body 16A and attached to the oxygen sensor 28 with its position relative to the cylinder head 19A fixedly defined by engaging with a positioning part 41 provided on the cylinder head 19A included in the engine main body 16A.
Referring to Figs. 6 and 7, the sensor guard 40 covering the cap 32 integrally includes a sensor positioning part 40a which engages with the positioning part 41 on the engine main body side, a cover part 40b provided continuously with the sensor positioning part 40a such that it covers the outer open end of the air passage 34, and a cord positioning part 40c provided continuously with the sensor positioning part 40a such that it defines the direction in which the cord 35 extends. The sensor guard 40 is produced by bend-forming a flat metal plate.
The sensor positioning part 40a includes: a center end plate part 40aa which is a flat plate part covering the outer-end bottom portion of the bottomed cylindrical part 32a included in the cap 32; a first side plate part 40ab which is formed perpendicularly to and Is158848.- Lhok 00 continuously with the center end plate part 40aa so that it faces, from the front side, the outer circumference of the oxygen sensor 28 installed in the cylinder head 19A; a second Sside plate part 40ac which is formed perpendicularly to and continuously with the center Cc end plate part 40aa such that it faces, from the rear side, the outer circumference of the s oxygen sensor 28 installed in the cylinder head 19A, the second side plate part 40ac being shorter than the first side plate part 40ab; an engaging part 40ad which perpendicularly outwardly projects from a middle portion of the end portion, away from the center end plate part 40aa, of the second side plate part 40ac so that it engages with the positioning 00 part 41 on the engine main body side provided in the cylinder head 19A; a pair of abutting 00 to parts 40ae which inwardly perpendicularly project from both sides of the end portion, IC away from the center end plate part 40aa, of the first side plate part 40ab so that they abut on the outer circumference of the housing 30 included in the sensor main part 31 of the oxygen sensor 28; and a pair of abutting parts 40af which inwardly perpendicularly project from both sides of the end portion, away from the center end plate part 40aa, of the second side plate 40ac so that they abut on the outer circumference of the housing Referring also to Fig. 8, the cover part 40b includes: a lower end plate part which downwardly extends from, and in the same plane as, the end plate part 40aa of the sensor positioning part 40a so as to cover the projection 32b of the cap 32 from the right side of the cylinder head 19A; an air passage cover part 40bb which is formed continuously with a lower end portion of the lower end plate part 40ba and perpendicularly to the lower end plate part 40ba so that it covers, from below, the outer open end of the air passage 34 that is open at the outer end of the projection 32b; and a pair of holding parts 40bc which are formed, at both sides of the lower end plate part perpendicularly to and continuously with the lower end plate part 40ba so that they elastically engage with the projection 32b from the front and rear sides to elastically hold the projection 32b.
The cord positioning part 40c includes: an upper end plate part 40ca which upwardly extends from, and in the same plane as, the end plate part 40aa of the sensor positioning part 40a so as to cover the projection 32c of the cap 32 from the right side of the cylinder head 19A; and a pair of holding parts 40cb which are formed, at both sides of the upper end plate part 40ca, perpendicularly to and continuously with the upper end plate part 40ca so that they elastically engage with the projection 32c from the front and rear sides to elastically hold the projection 32c.
Of the sensor guard 40, the abutting parts 40ae and 40af of the sensor positioning part 40a are abutted on the outer circumference of the housing 30 included in the sensor 1158848-I:hok 00 0 main part 31 of the oxygen sensor 28, the holding parts 40bc of the cover part Nelastically hold the projection 32b of the cap 32, and the holding parts 40cb of the cord Spositioning part 40c elastically hold the projection 32c of the cap 32. This allows the Cc sensor guard 40 to be attached to the oxygen sensor 28 in a fixed position relative to the s oxygen sensor 28. Also, the engaging part 40ad of the sensor positioning part 40a is engaged with the positioning part 41 on the engine main body side provided on the Scylinder head 19A to fixedly define the position relative to the cylinder head 19A of the sensor guard 40, that is, of the oxygen sensor 28.
,IC With the sensor guard 40 attached, in a fixedly defined position relative to the 00 lo cylinder head 19A, to the oxygen sensor 28, the direction in which the cord 35 extends from the oxygen sensor 28 is defined by the cord positioning part 40c, the air passage cover part 40bb of the cover part 40b covers the outer open end of the air passage 34 that is open in the outer surface of the cap 32, and the first side plate part 40ab of the sensor positioning part 40a covers the cap 32 from the front side.
The cylinder head 19A are integrally provided with plural cooling fins 42 projectedly formed on its outer circumference, the plural cooling fins 42 being spaced out along the cylinder axis. The positioning part 41 on the engine main part side is made up of two adjacent ones of the cooling fins 42. The engaging part 40ad of the sensor guard is engaged between the two adjacent cooling fins 42.
The first embodiment of the present invention has the following effects. The cap 32 of the oxygen sensor 28 installed in the sensor installation hole 29 provided in a portion around the exhaust port 23 of the cylinder head 19A is, at least partly, covered by the sensor guard 40 fixedly positioned relative to the cylinder head 19A, so that the direction relative to the cylinder head 19A in which the cord 35 extends from the oxygen sensor 28 is fixedly defined by the sensor guard 40. Thus, the direction in which the cord extends is fixedly defined with the oxygen sensor 28 protected by the sensor guard so that the cord 35 can be handled with ease.
The sensor guard 40 is formed discretely from the engine main body 16A and attached to the oxygen sensor 28 such that it engages with the positioning part 41 on the engine main body side provided on the cylinder head 19A included in the engine main body 16A. This improves workability in attaching the sensor guard 40, in a fixed position relative to the cylinder head 19A, to the oxygen sensor 28.
The sensor guard 40 integrally includes the sensor positioning part 40a having the engaging part 40ad to engage with the positioning part 41 on the engine main body side and covering the cap 32 of the oxygen sensor 28, the cover part 40b formed 1158848-Ihok 00 0 0 continuously with the sensor positioning part 40a such that it covers the outer open end of
(N
the air passage 34 formed in the cap 32 and being open in the outer surface of the cap 32, and the cord positioning part 40c formed continuously with the sensor positioning part CC 40a such that it defines the direction in which the cord 35 extends. The sensor guard can, therefore, prevent foreign matter such as dust and water from entering the oxygen sensor 28 via the air passage 34. Furthermore, the direction in which the cord 35 extends Scan be easily defined by the cord positioning part 40c formed continuously with the sensor positioning part 40a that engages with the positioning part 41 on the engine main 00 body side.
o The positioning part 41 on the engine main body side is made up of two adjacent N, ones of the plural cooling fins 42 projectedly provided on the outer circumference of the cylinder head 19A, so that no special part for positioning the sensor guard 40 relative to the cylinder head 19A is required. This makes it possible to define the position of the sensor guard 40 without causing an increase in the number of components required.
The engine main body 16A is mounted on a motorcycle such that the side where the exhaust port 23 is provided of the cylinder head 19A faces forward. Since the sensor guard 40 is formed to cover the cap 32 from the front side, the oxygen sensor 28 is protected against objects coming flying from the front of the motorcycle.
Figs. 9 and 10 show a second embodiment of the present invention. Fig. 9 is a perspective view, from diagonally below, of a cylinder head and a head cover included in an engine main body. Fig. 10 is a perspective view, from diagonally above, of the cylinder head and the head cover included in the engine main body.
The engine main body 16B is mounted on a motorcycle (not shown) such that an exhaust port 23 of a cylinder head 19B included in the engine main body 16B faces forward and obliquely downward. An oxygen sensor 28 is installed in a portion around the exhaust port 23 of the cylinder head 19B such that a projection 32b forming an air passage 34 faces forward and obliquely upward.
A head cover 20B included in the engine main body 16B and coupled to the cylinder head 19B is formed integrally with a sensor guard 44. The sensor guard 44, by engaging with the projection 32b, defines, relative to the cylinder head 19B, the position of the oxygen sensor 28 and the direction in which a cord 35 extends from the oxygen sensor 28 and covers the outer open end of the air passage 34 and at least a part of the cap 32 included in the oxygen sensor 28.
Moreover, the sensor guard 44 is formed such that, with the engine main body 16B mounted on a motorcycle, it covers the cap 32 from the front side.
1158848-I:hok 00 In the second embodiment, the cap 32 of the oxygen sensor 28 is, at least partly, covered by the sensor guard 44 fixedly positioned relative to the cylinder head 19B, so that the direction relative to the cylinder head 19B in which the cord 35 extends from the Mc, oxygen sensor 28 is fixedly defined by the sensor guard 44. Thus, the direction in which s the cord 35 extends is fixedly defined with the oxygen sensor 28 protected by the sensor guard 44, so that the cord 35 can be handled with ease.
SSince the sensor guard 44 covers the outer open end of the air passage 34, foreign matter such as dust and water can be prevented from entering the oxygen sensor 00 28 via the air passage 34. Also, since the sensor guard 44 is formed to cover the cap 32 from the front side, the oxygen sensor 28 is protected against objects coming flying from the front of the motorcycle.
Furthermore, since the sensor guard 44 is formed integrally with the head cover the number of components required and the number of man-hours required for installing the sensor guard 44 can be reduced.
Figs. 11 and 12 show a third embodiment of the present invention. Fig. 11 is a perspective view, from diagonally above, of a cylinder head. Fig. 12 is a perspective view of a part of the cylinder head as seen from diagonally above at an angle different from that of Fig. 11.
An engine main body 16C is mounted on a motorcycle (not shown) such that an exhaust port 23 of a cylinder head 19C included in the engine main body faces forward and obliquely downward. An oxygen sensor 28 is installed in a portion around the exhaust port 23 of the cylinder head 19C such that a projection 32b forming an air passage 34 faces rearward and such that a projection 32c letting a cord 35 extend outward faces forward.
Moreover, a sensor guard 45 is formed integrally with the cylinder head 19C, the sensor guard 45 covering the outer open end of the air passage 34 and at least a part of the cap 32 of the oxygen sensor 28.
The sensor guard 45 is comprised of a concave portion which is provided in the cylinder head 19C such that its inner side surface faces the outer open end of the air passage 34 and such that it accommodates most part of the oxygen sensor 28. A wall portion 45a covering the oxygen sensor 28 from the front side and forming a part of the side surface of the concave portion is provided with a restrictive concave portion 46 through which the projection 32c of the cap 32 of the oxygen sensor 28 extends and which prevents, by engaging with the projection 32b, the oxygen sensor 28 from turning about its axis.
1158848-I:hok 00
O
O Of plural cooling fins 47 provided on the outer circumference of the cylinder head 19C, some are provided with a concave portion 48 forming space required to allow Sthe oxygen sensor 28 to be attached to and detached from the cylinder head 19C.
c The third embodiment can produce effects similar to those of the second embodiment.
Embodiments of the present invention have been described, but the present Sinvention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention as claimed.
00 Description of Reference Numerals 0 to 16A, 16B, 16C... Engine main body 19A, 19B, 19C... Cylinder head Head cover Exhaust port Oxygen sensor as exhaust gas sensor Installation hole Sensor main part Cap Cord Air passage 40, 44, Sensor guard Sensor positioning part Engaging part Cover part Cord positioning part Positioning part on the engine main body side Cooling fan I 58848-1:hok

Claims (4)

1. An exhaust gas sensor installation structure for a four-cycle engine, in Swhich an exhaust gas sensor is installed in a cylinder head of an engine main body, the exhaust gas sensor comprising a sensor main part an end portion of which is exposed in s an exhaust port and a cap which is fitted to a rear portion of the sensor main part and from a side of which a cord extends; wherein: a sensor installation hole for installing the sensor main part is provided in a portion around the exhaust port of the cylinder head; 00 the cap is at least partly covered by a sensor guard fixedly positioned relative to 00 the cylinder head; and N' a direction in which the cord extends is fixedly defined by the sensor guard relative to the cylinder head.
2. The exhaust gas sensor installation structure for a four-cycle engine according to Claim 1, wherein the sensor guard formed discretely from the engine main body is attached to the exhaust gas sensor such that the sensor guard engages with a positioning part provided on the engine main body.
3. The exhaust gas sensor installation structure for a four-cycle engine according to Claim 2, wherein: the sensor guard integrally includes a sensor positioning part having an engaging part to engage with the positioning part provided on the engine main body and covering the cap; a cover part formed continuously with the sensor positioning part such that the cover part covers an outer open end of an air passage communicating with an interior of the sensor main part and opening in an outer surface of the cap; and a cord positioning part formed continuously with the sensor positioning part such that the cord positioning part defines a direction in which the cord extends.
4. The exhaust gas sensor installation structure for a four-cycle engine according to one of Claims 2 and 3, wherein the positioning part provided on the engine main body comprises two adjacent ones of a plurality of cooling fins projectedly formed on an outer circumference of the cylinder head. The exhaust gas sensor installation structure for a four-cycle engine according to Claim I,
1158848-I:hok 00 wherein the sensor guard is formed integrally with a head cover or the cylinder head included in the engine main body. 6. The exhaust gas sensor installation structure for a four-cycle engine Cc according to one of Claims 1 to wherein: the engine main body is mounted on a motorcycle such that a side where the exhaust port is provided of the cylinder head faces forward; and the sensor guard is formed to cover the cap from a front side. 7. An exhaust gas sensor installation structure substantially as hereinbefore described with reference to any one of the embodiments as that embodiment is shown in 00 lo the accompanying drawings. C Dated 11 March, 2008 Honda Motor Co., Ltd Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON S158848-1hok
AU2008201204A 2007-03-15 2008-03-13 Exhaust gas sensor installation structure for four-cycle engine Ceased AU2008201204B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007067046A JP4909136B2 (en) 2007-03-15 2007-03-15 4-cycle engine exhaust gas sensor mounting structure
JP2007-067046 2007-03-15

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AU2008201204B2 AU2008201204B2 (en) 2010-02-25

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CA (1) CA2618517C (en)
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IT (1) ITTO20080080A1 (en)

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FR2915513A1 (en) 2008-10-31
JP2008223728A (en) 2008-09-25
CA2618517C (en) 2012-04-17
AU2008201204B2 (en) 2010-02-25
JP4909136B2 (en) 2012-04-04
CA2618517A1 (en) 2008-09-15
ITTO20080080A1 (en) 2008-09-16

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