WO2007080654A1 - 内燃機関 - Google Patents
内燃機関 Download PDFInfo
- Publication number
- WO2007080654A1 WO2007080654A1 PCT/JP2006/300403 JP2006300403W WO2007080654A1 WO 2007080654 A1 WO2007080654 A1 WO 2007080654A1 JP 2006300403 W JP2006300403 W JP 2006300403W WO 2007080654 A1 WO2007080654 A1 WO 2007080654A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylinder head
- cylinder
- internal combustion
- plug
- combustion engine
- Prior art date
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 46
- 238000001816 cooling Methods 0.000 claims description 18
- 239000007789 gas Substances 0.000 description 42
- 239000003054 catalyst Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
-
- 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
- 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
- F02F1/242—Arrangement of spark plugs or injectors
-
- 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
- F02F1/26—Cylinder heads having cooling means
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
- F02F1/34—Finned cylinder heads with means for directing or distributing cooling medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
- F02P15/02—Arrangements having two or more sparking plugs
Definitions
- the present invention relates to an internal combustion engine having a cylinder head provided with an intake / exhaust port and two plugs.
- Patent Document 1 JP 2004-316430 A
- each plug and exhaust gas sensor are considered in consideration of cooling efficiency around each plug hole. Therefore, there is a demand for a configuration that enables efficient layout.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently lay out each plug and an exhaust gas sensor in an internal combustion engine provided with an intake / exhaust port and two plugs in a cylinder head.
- the present invention employs the following means.
- the first internal combustion engine of the present invention has a cylinder head (for example, the cylinder head 24 of the embodiment) provided with an intake port (for example, the intake port 49 of the embodiment) and an exhaust port (for example, the exhaust port 50 of the embodiment). , 124) and two plugs (for example, the respective plugs 64, 65 of the embodiment) attached to the cylinder head, the exhaust port (for example, the engine 20, 120 of the embodiment)
- One of the plugs is disposed on one side of the battery, and an exhaust gas sensor (for example, the exhaust gas sensor 68 of the embodiment) is disposed on the other side.
- the other of the plugs is connected to the front of the cylinder head.
- An air jacket (for example, air jacket 69 of the embodiment) that cools around the plug hole of each plug (for example, each of the plug holes 66, 67 of the embodiment) is disposed on the same side as the exhaust gas sensor. There will be a good thing.
- the second internal combustion engine of the present invention includes a cylinder head (for example, an embodiment) provided with an intake port (for example, the intake port 49 of the embodiment) and an exhaust port (for example, the exhaust port 50 of the embodiment).
- a running wind inlet (for example, running wind inlet 75 of the embodiment) of an air jacket (for example, the air jacket 69 of the embodiment) provided in the cylinder head is disposed on one side across the exhaust port, and is disposed on the other side.
- An exhaust gas sensor (for example, the exhaust gas sensor 68 of the embodiment) is disposed.
- the two plugs may be arranged in a single air jacket provided in the cylinder head.
- the first and second internal combustion engines have cylinder portions (for example, the cylinder portions 22, 122 of the embodiment) arranged so that the axis (for example, the axis C of the embodiment) is substantially horizontal with respect to the ground. You may have.
- the first internal combustion engine it is possible to efficiently lay out two plugs and an exhaust gas sensor in a single cylinder head.
- the exhaust gas sensor can be easily activated, and the warm-up operation force can also detect an accurate gas concentration.
- the other of the plugs is disposed on the same side of the cylinder head as the exhaust gas sensor; and the cylinder head is provided with an air jacket that cools the plug holes around the plugs. Therefore, the two plugs can be laid out efficiently while avoiding the exhaust gas sensor, and the flow of the running air in the air jacket can be improved to improve the cooling efficiency around each plug hole and the outer wall of the combustion chamber.
- the flow of the traveling wind in the air jacket is prevented so that the exhaust gas sensor does not obstruct the flow of the traveling wind introduced into the air jacket.
- the cooling efficiency of the outer wall can be improved.
- two plugs are provided in the cylinder head.
- the two plug seats and the cylinder head can be cooled by the single air jacket.
- first and second internal combustion engines include a cylinder portion that is arranged so that the axis thereof is substantially horizontal with respect to the ground
- the running wind is applied to the air jacket of the horizontally placed air-cooled internal combustion engine.
- the cooling efficiency can be improved by fully incorporating
- FIG. 1 is a left side view of a motorcycle according to Embodiment 1 of the present invention.
- FIG. 2 is a top view showing the arrangement of the engine, the exhaust pipe, and the like of the motorcycle.
- FIG. 3 is a right side view of the engine and the exhaust pipe.
- FIG. 4 is a sectional view of the engine.
- FIG. 5 is a cross-sectional view of the engine in a cross section orthogonal to the axis of the cylinder body.
- FIG. 6 is a cross-sectional view of the engine in a cross section perpendicular to the axis of the cylinder head.
- FIG. 7 is a view showing the arrangement of the ignition plug of the engine, and is a right side view corresponding to FIG. 3.
- FIG. 8 is an explanatory diagram showing the left side force of the cylinder portion of the engine.
- FIG. 9 A view of the cylinder head of the same engine as viewed from the front side.
- FIG. 10 is a view showing Example 2 of the present invention and is a cross-sectional view corresponding to FIG. 6.
- FIG. 11 is a view showing the engine of the same embodiment and is a right side view corresponding to FIG. Explanation of symbols
- the front / rear / left / right orientations in the following description are the same as the front / rear / left / right orientations of the vehicle unless otherwise specified.
- the arrow FR indicates the front of the vehicle
- the arrow LH indicates the left side of the vehicle
- the arrow UP indicates the upper side of the vehicle.
- left and right front forks 5 that pivotally support the front wheels 4 are connected to the head pipe 3 positioned at the front end of the body frame 2 via the steering stem 6. It is pivotally supported.
- a bar handle 7 for turning is attached to the upper part of the steering stem 6.
- the body frame 2 extends a single main tube 8 obliquely downward and rearward from the head pipe 3 to improve the ease of straddling with the lower portion between the head pipe 3 and the occupant seat 9 It is a so-called backbone type.
- the left and right pivot plates 10 are joined to the rear end portion of the main tube 8, and the front end portion of the swing arm 12 that pivotally supports the rear wheel 11 is pivotally supported on the left and right pivot plates 10.
- the front end portions of the left and right seat frames 13 extending obliquely upward and rearward are joined to the rear portion of the main tube 8, and the front and rear intermediate portions of the left and right seat frames 13 and the left and right arm rear end portions of the swing arm 12 are connected. Between the left and right rear cushions 14 are respectively arranged. Above the left and right seat frames 13, the seat 9 having seat surfaces for the driver and the rear passenger on the front and rear is arranged.
- reference numeral 15 denotes a driver step
- reference numeral 16 denotes a rear passenger step.
- An engine (internal combustion engine) 20 which is a prime mover of the motorcycle 1, is disposed inside the center lower part of the body frame 2 (inside the lower part).
- Engine 20 car crank rotation axis This is an air-cooled single-cylinder engine along the width direction (left-right direction), and has a basic configuration in which a cylinder portion 22 projects from the front end portion of the crankcase 21 toward the front of the vehicle.
- the engine 20 is supported by the left and right pivot plates 10 at the rear upper and lower portions of the crankcase 21 and the upper portion of the crankcase 21 is supported by the front and rear intermediate portions of the main tube 8 via the engine hanger 8a. 2 is installed.
- the cylinder head 24 on the distal end side (front end side) of the cylinder portion 22 is connected to the downstream side of the throttle body 26 and the proximal end side of the exhaust pipe 27 from the lower side thereof. Yes.
- An air cleaner case 26 a supported on the lower front side of the main tube 8 is connected to the upstream side of the throttle body 26.
- the exhaust pipe 27 bends and extends forward at one end below the cylinder head 24, folds leftward and rearward slightly ahead of the front end of the cylinder part 22, and the obliquely lower left side of the cylinder part 22 is substantially parallel to this. After extending rearward, it bends in the center of the vehicle width direction below the crankcase 21 and is connected to the front end (base end) of the silencer 27a located behind the engine 20.
- a catalytic converter (hereinafter sometimes simply referred to as a catalyst) 28 for exhaust gas purification is provided in a portion of the exhaust pipe 27 located diagonally below and to the left of the cylinder portion 22 (see FIG. 5).
- the silencer 27a has a base end force located between the rear end of the engine 20 and the front end of the rear wheel 11, and extends to the right of the rear wheel 11. By extending backward so as to overlap when viewed, it is formed in a substantially L shape in a top view.
- Rotational power from the engine 20 is output to a drive sprocket 32 on the left side of the rear portion of the crankcase 21 via each clutch and transmission 31 (see Fig. 4), which will be described later, housed in the crankcase 21. Then, this drive sprocket 32 is transmitted to the driven sprocket 34 on the left side of the rear wheel 1 1 through the drive chain 33.
- the front part of the body frame 2, the cylinder part 22 of the engine 20, the throttle body 26, the air cleaner case 26a, and the like are covered with a front body cover 35 made of synthetic resin.
- the front body cover 35 also serves as a redder shield that protects the driver's legs from wind force and other forces.
- the rear part of the body frame 2 is covered with a rear body cover 36 which is also made of synthetic resin.
- the rear body cover 36 is attached to the seat 9 together with the left and right seat frames 13. Support.
- An article storage box 37 located under the seat 9 is disposed in the rear body frame 2.
- a fuel tank 38 supported by the front portions of the left and right seat frames 13 is disposed below the front portion of the article storage box 37.
- the cylinder portion 22 of the engine 20 has a front end portion force forward of the crankcase 21 so that its axis C is substantially horizontal (in detail, slightly upward). It protrudes in the vehicle traveling direction).
- the cylinder portion 22 includes a cylinder body 23 attached to the front end portion of the crankcase 21, the cylinder head 24 attached to the front end portion of the cylinder body 23, and a head cover attached to the front end portion of the cylinder head 24. 25 is the main component.
- the longitudinal direction parallel to the axis C (cylinder axis) may be referred to as the cylinder longitudinal direction
- the vertical direction perpendicular to the axis C may be referred to as the cylinder vertical direction.
- the cylinder body 23 is formed with a cylinder bore 39 along the axis C, and a piston 40 is fitted in the cylinder bore 39 so as to be able to reciprocate.
- a small end portion of a connecting rod 41 is swingably connected to the piston 40 via a piston pin extending in the left-right direction.
- the large end portion of the connecting rod 41 is connected to the crankshaft 42 via a crank pin extending in the left-right direction. It is connected freely!
- the crankshaft 42 supports a crankpin via left and right crank webs between left and right shaft portions along the left and right direction.
- a centrifugal clutch 29 is coaxially arranged at the right end portion of the crankshaft 42, and the rotational power of the crankshaft 42 is transmitted to the primary drive gear 43 via the centrifugal clutch 29 according to the rotational speed.
- the primary drive gear 43 is coaxially arranged on the right shaft portion of the crankshaft 42, and the primary drive gear 43 is swept by the primary driven gear 44 coaxially arranged on the right side portion of the main shaft 45 behind the crankshaft 42.
- the main shaft 45 is disposed behind the crankshaft 42 in parallel with the left and right shaft portions, and a multi-plate clutch 30 capable of intermittent power transmission by a driver's operation is coaxially disposed at the right end portion of the main shaft 45.
- the rotational power input to the primary driven gear 44 is transmitted to the main shaft 45 via the clutch 30.
- the main shaft 45 together with the countershaft 46 arranged in parallel behind it, is a transmission gear.
- a group 47 (shown in FIG. 4 shows only a pair of transmission gears fitted to each other) 47 is supported.
- the main shaft 45, the countershaft 46, and the transmission gear group 47 mainly constitute a transmission 31.
- the reduction gear ratio of the transmission gear group 47 is increased through a change mechanism (not shown). Change to stages.
- the left end portion of the counter shaft 46 projects out of the crankcase 21 and the drive sprocket 32 is attached to the left end portion.
- the cylinder head 24 closes the front end opening of the cylinder bore 39 and forms a so-called pent roof type combustion chamber together with the piston 40 at the top dead center.
- the engine 20 in this embodiment is an OHC two-valve, and a single combustion chamber side opening at the intake port 49 or the exhaust port 50 is formed on the two inclined upper surfaces in the roof forming portion 48 of the combustion chamber, respectively. Each combustion chamber side opening is opened and closed by an intake valve 51 or an exhaust valve 52, respectively.
- Each intake port 49 and exhaust port 50 is a flow passage that communicates the combustion chamber with the throttle body mounting portion 53 at the upper portion of the cylinder head 24 or the exhaust pipe mounting portion 54 at the lower portion of the cylinder head 24.
- Side opening force After extending obliquely forward so as to be substantially orthogonal to the inclined upper surface, it curves upward or downward to reach the throttle body attaching portion 53 or the exhaust pipe attaching portion 54.
- the throttle body mounting portion 53 and the exhaust pipe mounting portion 54 form a plane that is substantially orthogonal to the cylinder vertical direction, and the insulator of the throttle body 26 or the coupling flange of the exhaust pipe 27 is brought into contact with these planes to be fastened.
- the stems of the valves 51 and 52 extend obliquely forward so as to be substantially orthogonal to the inclined upper surface, pass through the inner walls of the intake / exhaust ports 49 and 50, and then are respectively brought into the intake side or the exhaust side rocker at the tip portions thereof.
- the distal ends of the arms 55 and 56 are engaged.
- the other end of each rocker arm 55, 56 is in sliding contact with two cam ridges formed on a single camshaft 57.
- a driven sprocket 58 is coaxially fixed to the left end of the camshaft 57, and this driven sprocket 58
- An endless cam chain 60 is wound around the bucket 58 and a drive sprocket 59 coaxially fixed to the left end portion of the crankshaft 42.
- the camshaft 57 is linked to the crankshaft 42 to open and close the valves 51 and 52.
- a generator (not shown) is coaxially disposed at the left end of the crankshaft 42.
- a large number of cooling fins 61a and 61b are formed on the outer periphery of the cylinder portion 22. More specifically, a plurality of side cooling fins 61a are formed on the right side of the cylinder body 23 and the cylinder head 24 so as to be substantially orthogonal to the cylinder axis C, and above and below the cylinder body 23, the cylinder axis C and A plurality of upper and lower cooling fins 61b are formed substantially in parallel.
- a cam chain chamber 62 for accommodating the cam chain 60 is formed in the left side portion of the cylinder portion 22.
- the cam chain chamber 62 also functions as a return passage for the engine oil fed into the cylinder head 24 into the crankcase 21, and engine oil is provided so that the detection portion faces the cam chain chamber 62.
- An oil temperature sensor 63 for detecting the temperature is provided.
- the oil temperature sensor 63 is located on the lower left side of the cylinder body 23 and in the vicinity of the crankcase 21 (see FIG. 8), and is attached so that the leftward force is also inserted into the cylinder body 23.
- Reference numeral 60a in the figure denotes a cam chain tensioner that applies a predetermined tension to the cam chain 60.
- the catalyst 28 is located below the cam chain chamber 62 (slightly lower left of the cylinder portion 22).
- the cam chain chamber 62 forms a flat space with a reduced left-right width in the left side of the cylinder body 23 and the cylinder head 24.
- the cam chain chamber 62 has an inner wall 62a integrated with the cylinder inner wall and an upper inner wall 73 connected to the upper side. The outside is surrounded by an outer wall 62b having a U-shaped cross section. Since heat generated by combustion in the cylinder bore 39 is not directly transmitted to the outer wall 62b of the cam chain chamber 62, cooling fins are formed on the outer wall 62b (the left side of the cylinder 22).
- the engine 20 is twin plugged to improve combustion performance, improve output, and reduce fuel consumption.
- a first spark plug 64 is attached to the left side of the cylinder head 24, and a second spark plug 65 is also attached to the left front portion of the cylinder head 24 at an oblique front right. Bottom and left side of cylinder head 24
- the first and second plug holes 66 and 67 for allowing the plugs 64 and 65 to reach the roof forming portion 48 inside thereof are formed in the part.
- Each plug 64, 65 is screwed into a female screw hole formed in the roof forming portion 48 through the corresponding plug hole 66, 67, and fixed to the cylinder head 24 with its tip electrode portion facing the combustion chamber. It has been done.
- the first plug 64 is inclined with respect to the vertical direction of the cylinder in a plane substantially orthogonal to the horizontal direction, and the line of sight of the central axis along the cylinder axis (viewed along the cylinder axis C) ,
- the air intake ports 49 and 50 are arranged so as to be substantially parallel to the extending direction (so as to be substantially parallel to the upward and downward directions).
- the second plug 65 is inclined with respect to the left-right direction in a plane substantially orthogonal to the cylinder vertical direction, and its central axis is substantially orthogonal to the extending direction of the intake / exhaust ports 49, 50 as viewed in the cylinder axis direction. (So as to be substantially parallel to the left-right direction).
- each of the plugs 64 and 65 is arranged so as to be substantially L-shaped when viewed in the cylinder axial direction.
- the first plug 64 is offset so that its center axis is located on the left side of the cylinder axis C
- the second plug 65 is offset so that its center axis is located above the cylinder axis C. Is provided.
- the intake port 49 has an opening on the combustion chamber side positioned above the roof forming portion 48 and on the left side of the cylinder axis C, and the opening force on the combustion chamber side is generally upward (incline slightly to the right). And reaches the throttle body mounting portion 53 located almost immediately above the cylinder axis C.
- the exhaust port 50 has an opening on the combustion chamber side located on the right side of the lower part of the roof forming portion 48 and the cylinder axis C, and the opening force on the combustion chamber side is generally directed downward (in detail, slightly on the right side). It extends to the exhaust pipe mounting portion 54 located on the right side of the cylinder axis C.
- the exhaust pipe mounting portion 54 is offset to the right side, so that a work space for attaching and detaching the first plug 64 is secured.
- the exhaust port 50 is provided with an exhaust gas sensor (oxygen concentration sensor) 68 so that the target air-fuel ratio of intake air can be set based on the oxygen concentration of the exhaust gas.
- the exhaust gas sensor 68 uses a gate (catalyst) of platinum or the like, and the detection unit of the exhaust gas sensor 68 is disposed so as to face the exhaust port 50 of the cylinder head 24. It becomes easy to be heated to the operating temperature, and the detection sensitivity during warm-up operation (during cold operation) increases.
- the exhaust gas sensor 68 is attached so that the right side force is also inserted into the lower right side of the cylinder head 24 (the right side of the exhaust port 50).
- the first plug 64 is located on the opposite side (left side) of the exhaust gas sensor 68 across the exhaust port 50 in the cylinder head 24, and the second plug 65 is located on the same side (right side) of the exhaust gas sensor 68.
- the exhaust gas sensor 68 is arranged so that the cylinder axis is also spaced downward and the center axis thereof is substantially parallel to the left-right direction. That is, the exhaust gas sensor 68 is disposed so as to be substantially orthogonal to the first plug 64 and substantially parallel to the second plug 65 when viewed in the cylinder axial direction.
- the engine 20 generates cooling air (running air) in the rear part of the cylinder head 24 that effectively cools the cylinder head 24 (especially around the plug holes 66 and 67) that has a particularly large thermal load.
- An air jacket (cooling air flow passage) 69 for circulation is provided.
- the air jacket 69 is a space formed between the roof forming portion 48 and the bottom 70 of the valve operating chamber in the rear portion of the cylinder head 24 that communicates the plug holes 66 and 67 with each other. 7, 72, the upper inner wall 73 of the cam chain chamber 62, the fastening bolt passage 74 between the cylinder body 23 and the crankcase 21, etc. are left.
- This air jacket 69 allows the cooling air (running wind) to flow well around the plug holes 66 and 67 and allows the cooling air (running wind) to be introduced to the inside of the cylinder head 24. Cooling efficiency is improved.
- the air jacket 69 uses the two wind guide plates 78 and 79, which will be described in detail later, as a running wind inlet 75 around the first plug hole 66 that opens downward at the lower part of the cylinder head 24.
- the periphery of the second plug hole 67 that opens to the right side of the cylinder head 24 and is opened to the right side is configured as a traveling wind exhaust port (hereinafter referred to as a main exhaust port) 76.
- the air jacket 69 bends in a substantially L shape when the main path of the traveling wind from the traveling wind introduction port 75 to the main exhaust port 76 is viewed from the line of sight along the cylinder axial direction. Is formed.
- auxiliary exhaust ports 76a for discharging part of the traveling air introduced into the air jacket 69 from the traveling air inlet 75.
- the flow of the traveling wind in the air jacket 69 is indicated by a chain line arrow in FIG.
- the traveling wind inlet 75 (first plug hole 66) is connected to the exhaust port forming portion 72 and the lower left fastening bolt.
- the main exhaust port 76 (second plug hole 67) is formed between the upper right and lower right fastening bolt through portions 74.
- the traveling air introduction port 75 has a narrower width in the cylinder axial direction than the main exhaust port 76, and the first plug 64 is disposed so as to be sandwiched between the exhaust port forming portion 72 and the fastening bolt insertion portion 74.
- the exhaust port forming portion 72 (exhaust port 50), the traveling wind introduction port 75, and the first plug 64 are arranged so as to be lined up substantially on the left and right.
- the exhaust gas sensor 68 is arranged on the side opposite to the first plug 64 and the traveling wind inlet 75 with the exhaust port forming portion 72 (exhaust port 50) in the cylinder head 24 interposed therebetween.
- a center fin 77 is provided in the air jacket 69.
- the center fin 77 crosses the vicinity of the cylinder axis C to the left and right when viewed with a line of sight along the cylinder axis direction.
- the center fin 77 is a plate-like shape extending over the upper and lower walls of the air jacket 69, and is located between the intake and exhaust port forming portions 71 and 72 in the L-shaped middle portion of the air jacket 69, and the left end thereof is downward (running wind It is inclined toward the entrance 75 side).
- the center fin 77 smoothly guides the traveling wind introduced into the air jacket 69 from the traveling wind inlet 75 toward the main exhaust port 76 and increases the contact area of the traveling wind.
- the cooling efficiency of the cylinder head 24 is improved by branching to pass through the vicinity of the plugs 64 and 65, respectively.
- the running wind (in Fig. 8) is directed toward the running wind inlet 75 (first plug hole 66) of the air jacket 69.
- a first air guide plate 78 is provided to guide the air (indicated by a chain arrow).
- the first air guide plate 78 includes a plate-shaped air guide plate body 78a that is substantially parallel to the left-right direction and is spaced downward from the traveling air introduction port 75, and a pair of legs that support both left and right ends of the air guide plate body 78a.
- a traveling airflow passage that penetrates forward and backward is formed in a substantially U shape that opens upward.
- the wind guide plate main body 78a is inclined rearward and guides a part of the traveling wind flowing through the traveling wind flow passage toward the traveling wind introduction port 75 above.
- Such a first air guide plate 78 is integrally formed under the cylinder head 24 by aluminum die casting or the like.
- the oil temperature sensor 63 is located behind (downstream) the first air guide plate 78, and in front of the oil temperature sensor 63, the air temperature against the oil temperature sensor 63 should be suppressed.
- Stopper wall 80 Is erected downward.
- the stopper wall 80 has a plate shape substantially orthogonal to the axis C, and is integrally formed with the lower part of the cylinder head 24 by aluminum die casting or the like to reduce the contact of obstacles from the road surface to the oil temperature sensor 63.
- a second air guide plate 79 that guides the traveling wind toward the inside of the first air guide plate 78 is provided below the head cover 25 (on the road surface side).
- the second air guide plate 79 includes a flat air guide plate body 79a that is substantially parallel to the left-right direction and is spaced downward from the lower portion of the head cover 25, and a pair of legs that support the left and right ends of the air guide plate body 79a. 79b, and forms a traveling airflow passage that penetrates back and forth in a substantially U shape that opens upward when viewed in a line of sight along the cylinder axial direction.
- the front end of the second air guide plate 79 is positioned in the vicinity of the front end of the head cover 25, and the traveling wind immediately after hitting the front end of the head cover 25 is taken in and flows backward to guide it into the first air guide plate 78.
- Such a second air guide plate 79 is formed integrally with the lower portion of the head cover 25 by aluminum die casting or the like.
- the catalytic converter 28 has a cylindrical structure having a larger diameter than the exhaust pipe 27, for example, a two-cam structure (monolith) having a catalyst such as platinum attached thereto. It is housed in a case, and is provided in the middle of the exhaust pipe 27 at a position that is offset diagonally to the lower left of the cylinder portion 22.
- the catalyst 28 is heated to a predetermined reaction promoting temperature.
- the exhaust gas from the engine 20 that passes through it in the state is appropriately purified.
- the catalyst 28 is positioned obliquely below and to the left of the cylinder portion 22, that is, below the cam chain chamber 62, so that the heat of the heated catalyst 28 is not directly transmitted to the cylinder inner wall. Further, the catalyst 28 is disposed offset to the left side from the traveling wind inlet 75 of the air jacket 69, so that the heat of the catalyst 28 is difficult to enter the air jacket 69.
- the engine 20 of this embodiment includes the cylinder head 24 provided with the intake and exhaust ports 49, 50, and the first and second plugs 64, 65 attached to the cylinder head 24.
- the first plug 64 is disposed on one side of the exhaust port 50 and the exhaust gas sensor 68 is disposed on the other side.
- the two plugs 64 and 65 and the exhaust gas sensor 68 can be efficiently laid out for the single cylinder head 24. Further, the exhaust gas sensor 68 can be activated easily, and the warm-up operation force can also detect an accurate gas concentration. Further, according to the engine 20, the second plug 65 is disposed on the same side as the exhaust gas sensor 68 in the cylinder head 24, and the plugs 64, 65 are connected to the cylinder head 24. The air jacket 69 that cools around the plug holes 66, 67 is provided, so that the two plugs 64, 65 can be laid out efficiently avoiding the exhaust gas sensor 68, and the flow of running air in the air jacket 69 is good. Thus, the cooling efficiency of each of the plug holes 66 and 67 and the outer wall of the combustion chamber can be improved.
- the traveling wind inlet 75 of the air jacket 69 is disposed on one side of the exhaust port 50, and the exhaust gas sensor 68 is disposed on the other side.
- the flow of running wind introduced into the jacket 69 The flow of running wind in the air jacket 69 that is not obstructed by the exhaust gas sensor 68 is improved so that the cooling efficiency around the plug holes 6 6 and 67 and the outer wall of the combustion chamber is improved. Can be improved.
- Example 2 of the present invention will be described with reference to FIGS.
- the exhaust port 50 extends obliquely upward and to the right when viewed in a line of sight along the cylinder axial direction, as compared to the first embodiment.
- the points are mainly different, and the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the exhaust port 50 has its combustion chamber side opening positioned below the roof forming part 48 and on the right side of the cylinder axis C, and this combustion chamber side opening force is inclined to the right side.
- the exhaust pipe attachment portion 54 that extends downward and opens obliquely to the lower right on the right side of the cylinder axis C is reached.
- the left and right widths of the traveling wind introduction port 75 which is also the work space for attaching and detaching the first plug 64, are secured relatively large, and the flow rate of the traveling wind in the air jacket 69 is increased to improve the cooling efficiency of the cylinder head 24. .
- the exhaust gas sensor 68 is provided on the right side of the exhaust port 50 so as to be substantially orthogonal to the extending direction of the exhaust port 50 when viewed from the line of sight along the cylinder axial direction. It is attached to be inserted. As in the first embodiment, the exhaust gas sensor 68 may be mounted so that its central axis is substantially parallel to the left-right direction. In this case, the exhaust gas sensor 68 is attached to the cylinder portion 22. Do this The mounting workability is relatively improved.
- the present invention is not limited to the above-described embodiments.
- a DOHC engine having two camshafts for intake and exhaust in a cylinder head, and a valve is directly driven by a camshaft without using a rocker arm.
- the present invention is also applicable to a direct push engine, an engine having a plurality of at least one of intake and exhaust valves, a multi-cylinder engine, and a water-cooled engine.
- the exhaust gas sensor can be activated easily, and the warming-up operation force can also detect an accurate gas concentration.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0605873A BRPI0605873B1 (pt) | 2006-01-13 | 2006-01-13 | motor de combustão interna |
JP2006520428A JP4209441B2 (ja) | 2006-01-13 | 2006-01-13 | 内燃機関 |
PCT/JP2006/300403 WO2007080654A1 (ja) | 2006-01-13 | 2006-01-13 | 内燃機関 |
CN200680000643XA CN101111669B (zh) | 2006-01-13 | 2006-01-13 | 内燃机 |
ARP070100129 AR058992A1 (es) | 2006-01-13 | 2007-01-11 | Motor de combustion interna |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2006/300403 WO2007080654A1 (ja) | 2006-01-13 | 2006-01-13 | 内燃機関 |
Publications (1)
Publication Number | Publication Date |
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WO2007080654A1 true WO2007080654A1 (ja) | 2007-07-19 |
Family
ID=38256070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/300403 WO2007080654A1 (ja) | 2006-01-13 | 2006-01-13 | 内燃機関 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP4209441B2 (ja) |
CN (1) | CN101111669B (ja) |
AR (1) | AR058992A1 (ja) |
BR (1) | BRPI0605873B1 (ja) |
WO (1) | WO2007080654A1 (ja) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009027997A2 (en) * | 2007-08-24 | 2009-03-05 | Tvs Motor Company Ltd | Cylinder head assembly with spark plug housing |
JP2009162084A (ja) * | 2007-12-28 | 2009-07-23 | Honda Motor Co Ltd | 内燃機関の点火プラグ配置構造 |
JP2011196322A (ja) * | 2010-03-23 | 2011-10-06 | Honda Motor Co Ltd | エンジンにおける点火プラグ冷却装置 |
JP2012102662A (ja) * | 2010-11-10 | 2012-05-31 | Honda Motor Co Ltd | 排気ガスセンサーの取付け構造 |
CN103032125A (zh) * | 2011-09-28 | 2013-04-10 | 本田技研工业株式会社 | 内燃机 |
JP2013072420A (ja) * | 2011-09-29 | 2013-04-22 | Honda Motor Co Ltd | 内燃機関 |
CN103670771A (zh) * | 2012-08-31 | 2014-03-26 | 光阳工业股份有限公司 | 引擎汽缸头的散热构造 |
JP2014058975A (ja) * | 2013-11-11 | 2014-04-03 | Honda Motor Co Ltd | 自動二輪車の排気ガスセンサーの取付け構造 |
JP2016109042A (ja) * | 2014-12-05 | 2016-06-20 | 本田技研工業株式会社 | 鞍乗り型車両用内燃機関 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5479965B2 (ja) * | 2010-03-23 | 2014-04-23 | 本田技研工業株式会社 | 車両用エンジンにおける点火プラグ冷却装置 |
JP5771494B2 (ja) * | 2011-09-28 | 2015-09-02 | 本田技研工業株式会社 | 内燃機関の可変動弁装置 |
CN105201612B (zh) * | 2014-06-10 | 2018-08-07 | 光阳工业股份有限公司 | 摩托车的引擎导风结构 |
CN104343518A (zh) * | 2014-11-07 | 2015-02-11 | 重庆鼎工机电有限公司 | 通机发动机冷却结构 |
DE102015013784A1 (de) * | 2015-10-20 | 2017-04-20 | Andreas Stihl Ag & Co. Kg | Handgeführtes Arbeitsgerät |
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JPH11200913A (ja) * | 1998-01-13 | 1999-07-27 | Honda Motor Co Ltd | 内燃機関の排気ガスセンサ配置構造 |
JP2002047939A (ja) * | 2000-08-03 | 2002-02-15 | Honda Motor Co Ltd | 火花点火4サイクルエンジン |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4244178B2 (ja) * | 2003-09-26 | 2009-03-25 | 本田技研工業株式会社 | シリンダヘッドの冷却風通路構造 |
-
2006
- 2006-01-13 BR BRPI0605873A patent/BRPI0605873B1/pt not_active IP Right Cessation
- 2006-01-13 WO PCT/JP2006/300403 patent/WO2007080654A1/ja active Application Filing
- 2006-01-13 CN CN200680000643XA patent/CN101111669B/zh not_active Expired - Fee Related
- 2006-01-13 JP JP2006520428A patent/JP4209441B2/ja not_active Expired - Fee Related
-
2007
- 2007-01-11 AR ARP070100129 patent/AR058992A1/es not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11200913A (ja) * | 1998-01-13 | 1999-07-27 | Honda Motor Co Ltd | 内燃機関の排気ガスセンサ配置構造 |
JP2002047939A (ja) * | 2000-08-03 | 2002-02-15 | Honda Motor Co Ltd | 火花点火4サイクルエンジン |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009027997A2 (en) * | 2007-08-24 | 2009-03-05 | Tvs Motor Company Ltd | Cylinder head assembly with spark plug housing |
WO2009027997A3 (en) * | 2007-08-24 | 2009-04-30 | Tvs Motor Co Ltd | Cylinder head assembly with spark plug housing |
JP2009162084A (ja) * | 2007-12-28 | 2009-07-23 | Honda Motor Co Ltd | 内燃機関の点火プラグ配置構造 |
JP2011196322A (ja) * | 2010-03-23 | 2011-10-06 | Honda Motor Co Ltd | エンジンにおける点火プラグ冷却装置 |
JP2012102662A (ja) * | 2010-11-10 | 2012-05-31 | Honda Motor Co Ltd | 排気ガスセンサーの取付け構造 |
CN103032125A (zh) * | 2011-09-28 | 2013-04-10 | 本田技研工业株式会社 | 内燃机 |
JP2013072383A (ja) * | 2011-09-28 | 2013-04-22 | Honda Motor Co Ltd | 内燃機関 |
JP2013072420A (ja) * | 2011-09-29 | 2013-04-22 | Honda Motor Co Ltd | 内燃機関 |
US9334829B2 (en) | 2011-09-29 | 2016-05-10 | Honda Motor Co., Ltd. | Internal combustion engine |
CN103670771A (zh) * | 2012-08-31 | 2014-03-26 | 光阳工业股份有限公司 | 引擎汽缸头的散热构造 |
JP2014058975A (ja) * | 2013-11-11 | 2014-04-03 | Honda Motor Co Ltd | 自動二輪車の排気ガスセンサーの取付け構造 |
JP2016109042A (ja) * | 2014-12-05 | 2016-06-20 | 本田技研工業株式会社 | 鞍乗り型車両用内燃機関 |
Also Published As
Publication number | Publication date |
---|---|
BRPI0605873B1 (pt) | 2018-10-23 |
CN101111669A (zh) | 2008-01-23 |
AR058992A1 (es) | 2008-03-05 |
BRPI0605873A2 (pt) | 2009-05-26 |
CN101111669B (zh) | 2010-05-19 |
JPWO2007080654A1 (ja) | 2009-06-11 |
JP4209441B2 (ja) | 2009-01-14 |
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