DE102019114283A1 - piston engine - Google Patents

Abstract

An engine E includes: a cylinder 44 having a combustion chamber 45 defined therein; a cylinder head 46 formed with an intake air passage 69 through which intake air is introduced into the combustion chamber 45; an intake valve 64 for selectively opening and closing an intake air passage 60 that opens toward the combustion chamber 45 into the intake air passage 69; and a port injection fuel injection nozzle 80 mounted on a side adjacent to a crankshaft 40 rather than the intake air passage 69. The port injection fuel injection nozzle 80 is mounted so that its injection axis AX3 extends via the intake air passage 60 from an outlet 80a of the port injection fuel injection nozzle 80 to the combustion chamber 45.

Description

BACKGROUND OF THE INVENTION

(Field of the Invention)

The present invention relates to a reciprocating engine capable of burning in a combustion chamber an air-fuel mixture generated by the use of a fuel injection nozzle.

(Description of the Related Art)

A KE engine capable of injecting fuel through the fuel injection nozzle wherein, under a condition that an intake air valve is opened, fuel is injected through an intake air passage toward a combustion chamber is known. (See, for example, the Japanese Laid-Open Patent Application No. H05-340326 .)

Even with the engine designed to allow the fuel to be injected toward the combustion chamber, a further increase in power is desired.

SUMMARY OF THE INVENTION

In view of the above, the present invention is intended to provide a motor capable of achieving an increase in output.

To achieve the above object, an engine of the present invention includes: a cylinder in which a combustion chamber is defined; a cylinder head formed with an intake air passage through which intake air is introduced into the combustion chamber; an intake valve for selectively opening and closing an intake air passage that opens toward the combustion chamber in the intake air passage; and a port injection fuel injector mounted on a side adjacent to a crankshaft rather than the intake air passage, in which case the port injection fuel injector is mounted so that its injection axis extends across the intake air passage from a port of the port injection fuel injector to the combustion chamber.

According to the construction described above, the liquid fuel is sprayed into the combustion chamber and the air in the combustion chamber is cooled by the effect of the heat of vaporization, the fuel is injected from the port injection fuel injector while the intake air passage is in an open state. In addition, since the port injection fuel injection nozzle is mounted on the side adjacent to the crankshaft, it is easy to form the intake air passage close to the cylinder axis. Consequently, it is possible to make the shape of the intake air passage directed toward the combustion chamber into a straight line, and hence the flow passage resistance can be minimized. In view of this, the power of the engine can be increased.

In the present invention, an axis of an inlet of the intake air passage in the cylinder head may extend in a direction away from the crankshaft in a direction of the cylinder axis, while the axis of the inlet extends away from the cylinder head in a direction both toward the cylinder axis and toward is perpendicular to an axis of the crankshaft. According to this construction, since the intake air passage extends in a direction in which the intake air passage moves away from the crankshaft, it is easy to mount the port injection fuel injector on the crankshaft side instead of the intake air passage.

In the present invention, the cylinder head may be formed with an exhaust passage configured to supply exhaust gases from the combustion chamber, and the intake air passage has a radius of curvature greater than a radius of curvature of the exhaust passage. In such a case, an inlet of the intake air passage may be disposed at a position spaced from the crankshaft with respect to a direction of the cylinder axis, as compared with an outlet of the exhaust passage of the crankshaft. Since it is easy to form the intake air passage while being brought close to the cylinder axis, the positioning of the port injection fuel injection nozzle on the crankshaft side of the intake air passage can be simplified according to this construction.

In the present invention, the port injection fuel injector may be attached to the cylinder head, and a water jacket may also be formed at a location in the cylinder head adjacent to a position where the port injection fuel injector is attached. According to this construction, since the vicinity of the channel injection fuel injector is cooled, an undesirable increase in the temperature of the fuel to be injected can be suppressed. As a result, it is easy to spray the fuel into the combustion chamber before it is gasified.

In the present invention, the injection axis of the port injection fuel injection nozzle may pass through the intake air passage on the cylinder axis side with respect to a valve stem of the intake valve while the intake valve is in an open state. According to this construction For example, the fuel may be introduced from the port injection fuel injector into a region of the combustion chamber, which region is near the intake air passage and at a location adjacent the cylinder axis. Consequently, the mixing of such a fuel with the intake air introduced into the combustion chamber can be simplified, and thus the combustion efficiency can be increased.

In the present invention, a plurality of fuel injectors may be provided in the cylinder, and at least one of the fuel injectors may be used to inject the fuel into the combustion chamber in the cylinder. By changing the injection characteristics for each of the fuel injection nozzles, according to this construction, a plurality of fuel injections can be achieved.

In the present invention, an intake air hose fluidly connected to an inlet of the intake air passage and an upstream side fuel injection nozzle mounted at a position on the crankshaft side compared to the intake air hose may be used, and may be operable to move the fuel into the interior of the engine Inject air inlet hose. According to this construction, the plurality of injections for two fuel injection nozzles can be achieved. In addition, since the two fuel injectors are on the crankshaft side, it is easy to install the fuel hoses.

Any combination of at least two constructions disclosed in the appended claims and / or the patent specification and / or the accompanying drawings should be construed as included within the scope of the present invention. In particular, any combination of any two or more of the appended claims should also be construed as included within the scope of the present invention.

list of figures

• 1 ist eine Seitenansicht, welche ein Motorrad zeigt, das mit einem Motor ausgestattet ist, der in Übereinstimmung mit einer ersten bevorzugten Ausführungsform der vorliegenden Erfindung konzipiert ist;
• 2 ist eine Seitenansicht, welche den in 1 gezeigten Motor zeigt;
• 3 ist eine schematische Schnittansicht, die einen Zylinder und einen Zylinderkopf zeigt, die beide im Motor eingesetzt werden;
• 4 ist eine schematische Draufsicht, die den Zylinderkopf zeigt; und
• 5 ist eine schematische Draufsicht, welche einen in einem Motor eingesetzten Zylinderkopf zeigt, der in Übereinstimmung mit einer zweiten bevorzugten Ausführungsform der vorliegenden Erfindung konzipiert ist.

The present invention will be more fully understood by the following description of the preferred embodiments thereof, when taken in conjunction with the accompanying drawings. However, the embodiments and the drawings are given only for illustrative and explanatory purposes and are in no way to be construed as limiting the scope of the present invention, this scope is defined in the appended claims. In the accompanying drawings, like reference numerals are used to designate like parts throughout the several views, and:

• 1 Fig. 10 is a side view showing a motorcycle equipped with a motor designed in accordance with a first preferred embodiment of the present invention;
• 2 is a side view showing the in 1 shown motor shows;
• 3 Fig. 12 is a schematic sectional view showing a cylinder and a cylinder head, both of which are inserted in the engine;
• 4 Fig. 12 is a schematic plan view showing the cylinder head; and
• 5 FIG. 12 is a schematic plan view showing a cylinder head installed in an engine designed in accordance with a second preferred embodiment of the present invention. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, preferred embodiments of the present invention will be described in detail, with reference to accompanying drawings. 1 Fig. 13 is a side view particularly showing a motorcycle equipped with a piston engine designed in accordance with a first preferred embodiment of the present invention. The illustrated motorcycle includes a main frame 1 , which is a front half part of a vehicle frame structure FR forms, and one to a rear part of the main room 1 attached seat rail 2 so as to have a rear part of the vehicle frame structure FR to build. The main frame 1 has a front end that is a head module 4 integral with a head pipe 6 is formed. The head pipe 6 has a front fork 8th which is rotatably supported by a steering shaft (not shown). The front fork 8th has an upper end on which a handlebar 9 is fixed, and a front wheel 10 is at a lower end of the front fork 8th added.

The swingarm holder 12 is in a rear end portion of the main frame 1 provided. A swingarm 14 has a front end pivotable for upward and downward movements by the swingarm mount 12 is supported, and a rear wheel 16 is at a rear end of the swingarm 14 added.

An engine e is to the vehicle frame structure FR on a front side of the swingarm mount 12 attached and at a location below a middle lower part of the motorcycle frame structure FR , The motor e drives the rear wheel 16 by a force transmitting element (not shown), like, for example, a chain. The motor e used in the practice of the embodiment discussed herein is a water-cooled four-cylinder four-stroke engine in which a plurality of cylinders are lined up in a vehicle width direction. It should be noted, however, that the nature of the engine e not necessarily limited to those described above. A radiator 18 for radiating heat from an engine cooling water is in front of the engine with respect to a direction of travel e appropriate.

A fuel tank 20 is in an upper part of the main frame 1 attached and a driver's seat 22 and a passenger seat 24 are on the seat track 2 assembled. The motor e is between the handlebars 9 and the driver's seat 22 mounted in a forward and backward direction or longitudinal direction of the motorcycle. A covering made of resinous material 26 is mounted on a front vehicle part and has an air inlet opening defined in it 30 for introducing an intake air to the engine e should be delivered. The trim used in the practice of the embodiment discussed herein 26 covers a region from in front of the upper end portion of the front fork 8th extends to lateral outer sides of the front part of the vehicle.

The head module 4 referred to above comprises an inlet duct part 32 which is open at a front end thereof and the head pipe 6 referred to above, wherein the inlet duct part 32 and the head line 6 formed integrally with each other in the form of a molded article. The front end part of the intake duct part 32 is with a storage unit 34 connected. The stowage unit 34 is with the head module 4 connected, with a front end opening thereof with the Lufteinführöffnung 30 was linked. The head module 4 has a rear end section that has an air purifier 36 fluidly connected. The air purifier 36 is operable to control the intake air passing through the air inlet 30 is introduced to filter.

An incoming airflow A in the air inlet opening 30 was introduced, flows through the storage unit 34 and the inlet shaft part 32 and then gets rid of the air purifier 36 cleaned to a purified air CA finally, put in the engine e is introduced. It should be noted that on the storage unit 34 , referred to above, can be dispensed with. In addition, in the practice of the embodiment discussed herein, the incoming air has become A Than the intake air through the air purifier 36 However, precautions may be taken to use air as the intake air entering the air purifier 36 should be introduced behind the engine e or laterally outside the engine e flows in the vehicle width direction.

As in 2 shown includes the engine e : a crankshaft 40 which is a rotary shaft; a crankcase 42 for supporting the crankshaft 40 ; a cylinder 44 that with an upper part of the crankcase 42 connected and therein a piston 43 receives; one with an upper part of the cylinder 44 connected cylinder head 46 ; and a cylinder head cover 48 for covering an upper part of the cylinder head 46 , The crankshaft 40 extends in a width direction of the motor e that is, in the vehicle width direction.

A water jacket 56 is both inside the interior of the cylinder 44 as well as the cylinder head 46 educated. A cooling water inside the water jacket 56 is through the radiator 18 (in 1 shown) cooled. The cooling water, which has been heated to a high temperature due to heat exchange with the engine, is directed toward the radiator 18 directed. The cooling water, its temperature during the flow of cooling water through the radiator 18 is lowered by means of a water pump (not shown) to the water jacket 56 supplied by the engine.

A combustion chamber 45 is inside the interior of the cylinder 44 educated. The upper part of the combustion chamber 45 is with an intake air duct 60 and an exhaust duct 62 educated. The intake air duct 60 is behind the exhaust duct 62 positioned. The intake air duct 60 is with an inlet valve 64 for selectively opening and closing the intake air passage 60 provided. The outlet channel 62 is with an exhaust valve 66 for selective opening and closing of the outlet channel 62 provided.

The rear surface of the cylinder head 46 is with an air inlet 46a and, moreover, its front surface is with an outlet spout 46b educated. The cylinder 44 has an axis AX1 on that towards the side of the exhaust duct 46b is tilted while the axle AX1 away from the crankshaft 40 in a vertical direction. In the practice of the embodiment discussed herein, the cylinder axis is AX1 inclined forwards towards an upper area. In other words, the cylinder 44 and the cylinder head 46 mounted in a tilted forward manner.

An axis AX2 the air inlet 46a in the cylinder head 46 extends away from the crankshaft 40 in the direction of the cylinder axis AX1 while the axle AX2 away from the cylinder head 46 in a direction perpendicular to the cylinder axis AX1 is, runs. In the practice of the herein the embodiment extends, the axis extends AX2 the air inlet 46a to the rear while tilted upwards.

The air inlet 46a and the intake air passage 60 are through an inner inlet air passage 69 linked together. The outlet outlet 46b and the outlet channel 62 are through an internal outlet passage 71 linked together. The inner intake air passage 69 and the inner exhaust passage 71 are in the interior of the cylinder head 46 educated. Air or air-fuel mixture gets from the air intake 46a through the inner inlet air passage 69 and the intake air passage 60 through to the combustion chamber 45 delivered and then inside the combustion chamber 45 burned. In other words, the inner intake air passage forms 69 an intake air passage for introducing the intake air into the combustion chamber 45 and the air inlet 46a forms an inlet to the inner inlet air passage 69 (Intake air passage).

On the other hand, exhaust gases resulting from the combustion are discharged from the exhaust outlet 46b through the outlet channel 62 and through the inner exhaust passage 71 passed through. In other words, the inner exhaust passage forms 71 an exhaust passage for discharging the exhaust gases from the combustion chamber 45 and the outlet spout 46b forms an outlet of the inner outlet passage 71 (Discharge passage). An outlet pipe 50 is with the outlet outlet 46b fluidly connected, wherein the outlet conduit 50 at a point below the engine e is connected in fluid communication with a muffler (not shown) positioned behind the motorcycle.

The inner intake air passage 69 has a radius of curvature made smaller than the radius of curvature of the inner exhaust passage 71 , In other words, the inner intake air passage 69 so formed that it is compared to the inner outlet passage 71 the cylinder axis AX1 approaches. Besides, the enema is 46a the inner intake air passage 69 (Air inlet 46a ) are mounted at a position relative to the cylinder axis AX1 rather at a distance from the crankshaft 40 is spaced as from the spout 46b (Auslassauslauf 46b ) of the inner exhaust passage 71 , In the practice of the embodiment discussed herein, the air inlet is 46a above the outlet outlet 46b appropriate.

The air purifier 36 is above the cylinder head cover 48 appropriate. The air purifier 36 includes a cleaner cover 52 , which forms an outer cover, and a filter element 54 that inside the cleaner cover 52 is included. The filter element 54 is operable to filter the intake air. In other words, a dirt chamber 53 on an upstream side of the filter element 54 defined, within an interior of the cleaner envelope 52 with respect to the flow direction of the intake air, and a clean chamber 55 is on a downstream side of the filter element 54 Are defined.

The cleaner cover 52 is with a cleaner inlet 52a for introducing the intake air into the cleaner cover 52 and a purifier spout 52b for discharging the intake air within the shell 52 educated. The purifier outlet 52b of the air purifier 36 is above the cylinder head 46 of the motor e appropriate. In the practice of the embodiment discussed herein, the clean chamber is 55 of the air purifier 36 above the air inlet 46a appropriate.

A throttle body 72 is between the purifier outlet 52b and the air inlet 46a fluidly connected. The throttle body 72 forms an inlet air hose that connects to the air inlet 46a (Inlet of the intake air passage) is fluidly connected. This throttle body 72 has an axis that coincides with the axis AX2 the air inlet 46a coincides. In other words, the throttle body 72 (Inlet Air Hose) used in the practice of the embodiment discussed herein, has a downdraft structure in which the intake air supplied to the engine e to be delivered flows from top to bottom.

A throttle valve 74 For regulating the amount of intake air is in the intake air passage within the throttle body 72 provided. The throttle body 72 and the throttle valve 74 are used for every cylinder. The throttle body 72 is with an upstream side fuel injector 75 assembled. The upstream side fuel injection nozzle 75 injects a fuel F1 towards an area on a downstream side of the throttle valve 74 with respect to the flow direction of the intake air, into the intake air passage within the interior of the throttle body 72 , on.

The upstream side fuel injection nozzle 75 is on one side of the throttle body 72 (Intake air hose) attached to the crankshaft 40 adjacent, attached. In the practice of the embodiment discussed herein, the upstream side fuel injector is 75 to the throttle body 72 added. The throttle valve 74 and the upstream side fuel injection nozzle 75 are controlled by an electronic control unit (not shown).

The cylinder head 46 has a rear surface to which a port injection fuel injector 80 is attached. An outlet 80a (Injection port) of the port injection fuel injection nozzle 80 opens into the inner inlet air passage 69 , As in 3 shown, an injection axis is sufficient AX3 the port injection fuel injector 80 to the combustion chamber 45 after having the spout 80a the port injection fuel injector 80 past the inlet air duct 60 during an open state of the intake valve 64 has left. In other words, the port injection fuel injector injects 80 the fuel toward a gap between the inlet air duct 60 and a valve body 64a of the inlet valve 64 when the inlet valve 64 in open condition.

The port injection fuel injector 80 injects the fuel F2 in the direction of a part S1 attached to the axis of the combustion chamber 45 adjacent, that is, to the cylinder axis AX1 adjacent, into the gap referred to above. More specifically, an injection axis extends AX3 the port injection fuel injector 80 through the intake air passage 60 on one side of a valve stem 64b of the inlet valve 64 to the cylinder axis AX1 adjacent, through, while the inlet valve 64 kept in the open state.

The port injection fuel injector 80 is below the air purifier 36 ( 2 ) appropriate. More specifically, the port injection fuel injection nozzle 80 below the throttle body 72 appropriate. In other words, the port injection fuel injector is 80 mounted below the intake air passage through which the intake air into the combustion chamber 45 is introduced after it has flowed from top to bottom. The port injection fuel injector 80 is on one side opposite the spark plug 81 , relative to the intake air passage, attached. As in 2 shown is the port injection fuel injector 80 , on a part in the cylinder head 46 , adjacent to the place where the water jacket 56 is formed, added.

Like the upstream side fuel injector 75 is the port injection fuel injector 80 on one side of the crankshaft 40 mounted in the intake air passage. In the practice of the embodiment discussed herein, the port injection fuel injector is 80 on the side, more likely to the crankshaft 40 as to the inner inlet air passage 69 adjacent, attached. The port injection fuel injector 80 is operational to the fuel F2 toward a region on the downstream side of the upstream side fuel injection nozzle 75 Inject in the intake air passage.

The motor e As referred to in the description of the embodiment discussed herein, a four-valve type engine is one. In other words, the inlet valve 64 and the exhaust valve 66 , for every cylinder 85 (the cylinder 44 and the cylinder head 46 ) of the motor e , each used in a two-number. For every cylinder 85 are the two port injection fuel injectors 80 provided. In other words, the fuel F2 , for each combustion chamber 45 , from the two port injection fuel injectors 80 injected.

As in 4 shown is the cylinder head 46 with the inner intake air passage 69 for every cylinder 85 (the combustion chamber 45 ) educated. 4 also illustrates only one cylinder 85 , Each inner intake air passage 69 includes an upstream part 69a and two downstream, away from the upstream part 69a from forks, parts 69b , The upstream part 69a has an upstream end with the air inlet 46a is linked. The downstream part 69b has a downstream end that communicates with the intake air passage 60 is linked. In addition, the throttle body 72 with each inner intake air passage 69 fluidly connected and the throttle valve 74 is in each throttle body 72 added.

Each inner intake air passage 69 is with two port injection fuel injectors 80 provided. One of the port injection fuel injection nozzles 80 injects the fuel F2 to the intake air passage 60 through one of the downstream parts 69b the inner intake air passage 69 on. The other of the port injection fuel injectors 80 injects the fuel F2 to the intake air passage 60 through the other of the downstream parts 69b on.

The operation of the air intake system of the engine employed in the practice of the embodiment discussed herein will now be described. If the motorcycle as a result of starting the engine e is driven, the incoming air flow A through the air inlet opening 30 in the storage unit 34 introduced. The incoming airflow A flows from the storage unit 34 through the inlet shaft part 32 and then in the in 2 shown air purifier 36 introduced. The incoming airflow A after passing through the filter element 54 inside the air purifier 36 was filtered, the purified air CA ,

The purified air CA within the cleanroom 55 is through the in 3 shown throttle body 72 through the air inlet 46a of the motor e introduced. At this time, inside the throttle body 72 , the amount of air through the throttle valve 74 adapted, and also the fuel F1 , on the downstream side of the throttle valve 74 , from the upstream side fuel injection nozzle 75 in the purified air CA injected, thus the air-fuel mixture M to build. At this time, it flows through the upstream side fuel injection nozzle 75 injected fuel F1 (Air-fuel mixture M ) due to the purified air CA . its flow velocity due to throttling by the throttle valve 74 has been increased, smoothly.

The air-fuel mixture M gets from the air inlet 46a in the interior of the engine e is introduced and then via the intake air duct 60 through the inner inlet air passage 69 into the combustion chamber 45 introduced. In addition, the fuel is F2 from the port injection fuel injector 80 into the combustion chamber 45 injected. That of the intake air duct 60 introduced air-fuel mixture M is within the combustion chamber 45 together with the fuel F2 that of the port injection fuel injector 80 into the combustion chamber 45 is injected, burned. The exhaust gases EG are after combustion through the exhaust duct 62 through to the outside of the combustion chamber 45 issued.

It should be noted that, although in the practical application of the embodiment discussed above, the upstream side fuel injector 75 Use was made of the use of the upstream side fuel injector 75 can be waived. If on the upstream side fuel injector 75 is omitted, the purified air CA as shown by the double dotted line from the air inlet 46a in the inner intake air passage 69 introduced. The purified air CA will be together with the fuel F2 that of the port injection fuel injector 80 is injected from the intake air passage 60 into the combustion chamber 45 introduced.

According to the construction described above, the injection of the fuel F2 from the port injection fuel injector 80 when the intake air passage 60 is maintained in the open state, from the injection of a liquid fuel into the combustion chamber 45 accompanied. As a result of gasification of the fuel within the combustion chamber 45 will increase the temperature in the combustion chamber 45 suppressed. In addition, because the injection axis AX3 the port injection fuel injector 80 mounted so that they pass through the inlet air duct 60 runs and then the combustion chamber 45 achieved, most of the fuel is in the combustion chamber 45 introduced without abutting against an inlet air passage wall, and conducts heat from the interior of the combustion chamber 45 from.

In view of the above, the high compression ratio of the engine e be achieved. As a result, can increase the combustion efficiency of the engine e can be expected, and thus both an increase in power of the engine and an increase in the fuel consumption of the engine can be achieved. However, it is because the port injection fuel injector 80 attached to one side, which is closer to the crankshaft 40 as at the inner intake air passage 69 simply, the inner inlet air passage 69 close to the cylinder axis AX1 bring to. Consequently, the shape of the inner intake air passage 69 that goes in the direction of the combustion chamber 45 oriented, more like the straight line are formed, and thus the flow resistance can be reduced. As a result, an increase in engine output can be achieved.

In addition, fuel hose, control cable and power cable of the port injection fuel injector 80 closer to the side of the crankshaft 40 as at the inner intake air passage 69 to be appropriate. Consequently, the inner intake air passage 69 adjacent to the cylinder axis AX1 to be appropriate. As a result, the fuel must F2 not far away from the port injection fuel injector 80 can be injected and a sputtering of the fuel can be achieved easily.

Also, because of the fuel F2 from the port injection fuel injector 80 is injected when the intake air duct 60 in an open state, adhesion of the fuel to the intake air passage is suppressed, and thus improvement in high horsepower, high torque, low fuel consumption, and exhaust gas improvement, as can be observed in the direct injection engine, can be expected. In addition, since the fuel injection port 80a in the inner intake air passage 69 and not in the combustion chamber 45 attached, no high pressure needed. Consequently, the structure is simplified compared to the direct injection engine.

The axis AX2 of the enema 46a (Air inlet 46a) the inner intake air passage 69 extends upwards towards the back. Thus, it is because the inner intake air passage 69 extends upwards, moving it away from the crankshaft 40 runs, simply, the port injection fuel injector 80 at a location below the inner intake air passage 69 attach and on the side that is more likely to the crankshaft 40 as to the inner inlet air passage 69 borders. In other words, it is easy to use the port injection fuel injection nozzle 80 at a location near the intake valve 64 to position. Consequently, the fuel can F2 before being gasified, to the combustion chamber 45 to be delivered.

The radius of curvature of the inner inlet air passage 69 is set to a value larger than the radius of curvature of the inner exhaust passage 71 and the enema 46a the inner intake air passage 69 is in a position above the spout 46b of the inner outlet passage 71 appropriate. Consequently, the inner intake air passage 69 be formed easily while being closer to the cylinder axis AX1 and thus the port injection fuel injector 80 also easily on the side of the crankshaft 40 the inner intake air passage 69 be attached.

The water jacket 56 is in one place, in the cylinder head 46 , adjacent to the position of the cylinder head 46 where the port injection fuel injector 80 attached, formed. Consequently, since the periphery of the port injection fuel injector 80 is cooled, an increase in the temperature of the channel injection fuel injector 80 injected fuel F2 be suppressed. As a result, the fuel can, before it is gasified, easily into the combustion chamber 45 be injected.

While the inlet valve 64 in the open state, the injection axis runs AX3 the port injection fuel injector 80 in a place that is closer to the cylinder axis AX1 as at the valve stem 64b of the inlet valve 64 located through the intake air passage 60 , Consequently, the fuel from the port injection fuel injector 80 in an upper part of the combustion chamber 45 be directed. Consequently, the mixing of such a fuel with that in the upper part of the combustion chamber 45 introduced intake air, which results in an increase of the combustion efficiency.

As in 4 Shown are the two port injection fuel injectors 80 for every cylinder 85 and fuel is supplied from these two port injection fuel injectors 80 and 80 in the appropriate combustion chamber 45 injected. As a result, the flow rate of the port injection fuel injection nozzle becomes 80 injected fuel halved. As a result, atomization can be realized and the homogeneity of the air-fuel mixture increases. Consequently, the combustion inside the combustion chamber 45 can be stabilized and also THC (total hydrocarbon content) can be reduced. Additionally, by providing the injection characteristics for each of the port injection fuel injectors 80 be changed, a variety of fuel injections can be realized.

The upstream side fuel injection nozzle 75 is to a part of in 2 shown throttle body 72 on the side, attached to the crankshaft 40 adjoins, added. By providing the two fuel injectors 75 and 80 a variety of injections can be achieved. In addition, a fuel hose, as the two fuel injectors 75 and 80 on the side of the crankshaft 40 be easily installed.

As the port injection fuel injector 80 on the cylinder head 46 is arranged, the distance from the spout can 80a (Injection channel) to the combustion chamber 45 be shortened. Consequently, the delivery of the fuel F2 to the combustion chamber 45 be relieved. When the port injection fuel injector 80 at the throttle body 72 is fixed, there may be the possibility, depending on the random error when attaching, that the position of the injection axis AX3 the port injection fuel injector 80 relative to the intake air passage 60 can be postponed. As the port injection fuel injector 80 however, in the above-described construction on the cylinder head 46 is fixed, the displacement of the injection axis AX3 relative to the intake air passage 60 be minimized.

The injection axis AX3 is set to be above the valve body 64a of the inlet valve 64 , which is in the open state at this time, runs, that is, on the side opposite to the crankshaft 40 , Consequently, the fuel can F2 easily in the vicinity of the spark plug 81 be injected. The port injection fuel injector 80 is on the side opposite the driving device of the throttle valve 74 attached relative to the intake air passage. As a result, interference between the port injection fuel injection nozzle may be troublesome 80 and the driving device of the throttle valve 74 be avoided.

The injection axis AX3 the port injection fuel injector 80 can be fitted so that they pass through the valve stem 64b of the inlet valve 64 runs or so that they interfere with the valve stem 64b avoids. In addition, the injection axis AX3 be attached so that the injection axis AX3 the valve body 64a of the inlet valve 64 not distracting. In the arrangement, the injection axis AX3 in a place where the injection axis AX3 the valve body 64 will not interfere, installed and therefore any fuel will crash F2 with the valve body 64a avoided, and the fuel F2 can effectively contact the combustion chamber 45 to be delivered. When the injection axis AX3 relative to the valve body 64a to the cylinder axis A1 can be shifted, the fuel can F2 into the combustion chamber 45 , which is narrow when the piston reaches top dead center, to be injected. When the injection axis AX3 on the cylinder axis A1 opposite side relative to the valve body 64a can be easily caused that the fuel along the swirl flow of intake air around the cylinder axis A1 moved around.

The inner intake air passage 69 extends from the air inlet 46a to the intake air duct 60 while he is crooked. The fuel from the port injection fuel injector 80 will be in the direction of the combustion chamber 45 after injecting the radial outer portion of the bend relative to the valve body 64a of the inlet valve 64 has gone through. The outside of the bend in the inner inlet air passage 69 is such that the flow rate of the intake air increases due to the effect of the centrifugal force. As the fuel F2 In the region where the flow velocity becomes high as discussed above, the fuel can easily flow toward the combustion chamber 45 be directed.

5 illustrates the cylinder of the engine e which is designed in accordance with a second preferred embodiment of the present invention. 5 only illustrates one cylinder 85 as a representative example. As in 5 shown is the port injection fuel injector 80 in the practical application of the second embodiment, for each inner intake air passage 69 provided and the spout 80a (Injection port) of the port injection fuel injection nozzle 80 is provided in a twosome. The fuel F2 is from the two injection channels 80a in the direction of the associated intake air ducts 60 injected. Even in the practical application of the second embodiment described above, effects that are similar to those made possible by the first embodiment described above can be obtained.

Although a suction motor has been referred to in describing the above embodiments of the present invention, the present invention can also be applied to a compressor motor. In the case of the compressor motor, a compressor and an intake air chamber are on a downstream side of the air cleaner 36 and on an upstream side of the throttle body 72 provided. Since the temperature of the intake air tends to increase in the case of the compressor motor, suppression of the temperature within the combustion chamber 45 coming from the sewer injection fuel injector 80 results, more effective. Even in the case of the supercharged engine, the use of the upstream side fuel injector can be used 75 be waived.

In addition, although in the above embodiments of the present invention, the intake air passage part may be the intake air passage 32 in the intake air passage through the space above the engine e extends through the space lateral to the cylinder 44 or to the cylinder head 46 of the motor e run. Although the engine e As referenced and described in the above embodiments of the present invention, when a four-cylinder engine has been shown and described, the engine may e a single-cylinder engine or an engine having more than four cylinders. In addition, the throttle valve 74 of a kind that is not electrically controlled.

Although the present invention has been fully described in connection with its preferred embodiments with reference to the accompanying drawings, which are used for illustrative purposes only, those skilled in the art will quickly appreciate numerous changes and modifications within the scope of the invention after reading the patent specification of the present invention presented herein Recognize obviousness. For example, although reference was made to the four-valve type engine in describing the above-mentioned embodiments, the present invention can be applied to a two-valve type engine. In addition to a motorcycle, the present invention can be applied to any saddle seat vehicle, such as, for example, a tricycle vehicle and a four-wheel buggy.

Accordingly, such changes and modifications as they come within the scope of the present invention, as evidenced by the claims appended hereto, are construed as being included therein.

LIST OF REFERENCE NUMBERS

40

crankshaft

44

cylinder

45

combustion chamber

46

cylinder head

46a

Air intake (intake air intake)

46b

Outlet outlet (outlet of the outlet passage)

56

water jacket

60

Intake air passage

64

intake valve

64b

Valve stem of the intake air valve

69

Inner intake air passage (intake air passage)

71

Inner outlet passage (outlet passage)

72

Throttle body (intake air hose)

75

upstream side fuel injector

80

Kanaleinspritzkraftstoffeinspritzdüse

80a

Fuel injector outlet

AX1

cylinder axis

AX2

Axis of inlet of intake air passage

AX3

Injection axis of the fuel injector

e

engine

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• JP H05340326 [0002]

Claims (8)

Engine that includes: a cylinder (44) in which a combustion chamber (45) is defined; a cylinder head (46) formed with an intake air passage (69) through which intake air is introduced into the combustion chamber; an intake valve (64) for selectively opening and closing an intake air passage (60) opening in the direction of the combustion chamber in the intake air passage; and a port injection fuel injector (80) mounted on a side adjacent a crankshaft (40) rather than the intake air passage, the port injection fuel injector being mounted so that its injection axis (AX3) extends from the outlet (80a) through the intake air passage. the channel injection fuel injector extends to the combustion chamber. Engine after Claim 1 wherein an axis of an inlet (46a) of the intake air passage in the cylinder head extends in a direction away from the crankshaft in a direction of the cylinder axis (AX1), while the axis of the intake away from the cylinder head in a direction coinciding with the cylinder axis is also perpendicular to an axis of the crankshaft, away. Engine after Claim 1 or 2 wherein: the cylinder head is formed with an exhaust passage (71) configured to supply exhaust gases from the combustion chamber; and the intake air passage has a radius of curvature greater than a radius of curvature of the exhaust passage. Engine after Claim 3 wherein an inlet of the intake air passage is attached to a position spaced from the crankshaft with respect to a direction of the cylinder axis as compared with an outlet (46b) of the exhaust passage of the crankshaft. Engine after one of the Claims 1 to 4 wherein: the port injection fuel injector is attached to the cylinder head; and a water jacket (56) is formed at a location in the cylinder head adjacent to a position where the port injection fuel injection nozzle is attached. Engine after one of the Claims 1 to 5 wherein the injection axis of the port injection fuel injection nozzle passes through the intake air passage on the cylinder axis side with respect to a valve stem (64b) of the intake valve while the intake valve is in an open state. Engine after one of the Claims 1 to 6 wherein a plurality of fuel injectors are provided in the cylinder and at least one of the fuel injectors is used to inject the fuel into the combustion chamber in the cylinder. Engine after one of the Claims 1 to 7 further comprising: an intake air hose (72) fluidly connected to an inlet of the intake air passage; and an upstream side fuel injector (75) mounted at a position that is on the side of the crankshaft rather than the intake air hose, the upstream side fuel injector being operable to inject the fuel into the interior of the intake air hose.

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