WO2005047668A1 - 内燃機関 - Google Patents
内燃機関 Download PDFInfo
- Publication number
- WO2005047668A1 WO2005047668A1 PCT/JP2004/016607 JP2004016607W WO2005047668A1 WO 2005047668 A1 WO2005047668 A1 WO 2005047668A1 JP 2004016607 W JP2004016607 W JP 2004016607W WO 2005047668 A1 WO2005047668 A1 WO 2005047668A1
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- WO
- WIPO (PCT)
- Prior art keywords
- throttle valve
- internal combustion
- combustion engine
- intake pipe
- air
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1035—Details of the valve housing
- F02D9/104—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing
- F02D9/1045—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing for sealing of the flow in closed flap position, e.g. the housing forming a valve seat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1005—Details of the flap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1035—Details of the valve housing
- F02D9/104—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/107—Manufacturing or mounting details
Definitions
- the present invention relates to an internal combustion engine, and more particularly, to an internal combustion engine provided with a butterfly type throttle valve in an intake passage.
- FIG. 1 shows an internal combustion engine disclosed in Patent Document 1.
- the combustion chamber 211 is provided with an intake passage 212 through which the external force of the cylinder 202 also passes.
- a downstream side of the intake passage 212 is formed at the rear of the cylinder head 207 and extends in the front-rear direction. Extending.
- the upstream side of the intake passage 212 is formed in an intake pipe 213 connected to the rear side of the cylinder head 207.
- a throttle valve 214 for opening and closing the intake passage 212 is provided, and the throttle valve 214 is a notch type.
- the upstream end of the intake passage 212 of the intake pipe 213 communicates with the atmosphere through an air cleaner.
- a fuel injection valve 217 for injecting and supplying fuel 216 is provided in an intake passage 212 downstream of the throttle valve 214.
- the intake stroke is when the piston 209 descends from top dead center toward the bottom dead center.
- the intake opening 228 is opened by the opening operation of the intake valve 229.
- the air 250 is sucked from outside the cylinder 202 by the negative pressure in the combustion chamber 211 and the intake passage 212.
- the fuel injection valve 217 injects the fuel 216 with respect to the air 250 passing through the intake passage 212, whereby an air-fuel mixture 251 is generated.
- This mixture 251 is formed into a tumble flow (a swirling flow around an axial center extending in the left and right directions) 252 in the combustion chamber 211.
- Patent Document 1 Japanese Patent Application Laid-Open No. 8-218875
- the shape of the intake passage (intake port) leading to the combustion chamber 211 is important, and the design of the intake port often promotes the strength of the tumble flow.
- the intake passage intake port leading to the combustion chamber 211
- the design of the intake port often promotes the strength of the tumble flow.
- it is preferable to generate a tumble flow during idling or low load it is desirable to operate the engine with a relatively rich and uniform fuel mixture (uniform combustion) at higher load. (See, for example, Japanese Patent Publication No. 9 317505). If a tumble flow is generated regardless of the combustion mode, the gas flow will not be evenly distributed in the combustion chamber, which tends to result in lower combustion efficiency, lower output, and worse fuel economy. Therefore, the formation of the tumble flow is adjusted by controlling the opening and closing operations of the first intake valve and the second and third intake valves using a variable valve mechanism.
- variable valve mechanism When the variable valve mechanism is used, the structure is naturally more complicated than when the variable valve mechanism is not used, and the arrangement space is extremely limited like a motorcycle, which not only increases the cost but also increases the cost. Such engines are likely to be unsuitable.
- the present invention has been made in view of its power, and a main object of the present invention is to provide an internal combustion engine that can generate a tumble flow and adjust the formation of the tumble flow with a simple configuration. .
- the internal combustion engine of the present invention is an internal combustion engine provided with a combustion chamber and an intake pipe for introducing air into the combustion chamber, and the amount of air introduced into the combustion chamber into the intake pipe.
- a throttle valve for adjusting the pressure of the intake pipe the throttle valve having a first end and a second end located opposite to the first end; Of which, upstream of the throttle valve, the flow of air toward the first end of the throttle valve is more toward the second end.
- a step is provided to enhance the flow of forced air.
- the throttle valve is a butterfly type throttle valve, and a pivot shaft for pivotally supporting the throttle valve is provided between the first end and the second end. Is formed.
- the second end of the throttle valve moves forward and backward around the pivot shaft in a downstream direction, whereby: The opening and closing operations of the throttle valve are executed.
- the step is preferably disposed near the first end of the throttle valve.
- the vicinity is located upstream of the position of the first end when the throttle valve is fully closed, and is located at the center of the first end and the second end. It suffices if it is in the area downstream of the minute position.
- At least a part of the step is located upstream of the position of the first end when the throttle valve is most closed and when the throttle valve is most opened. Exists in a region downstream of the position of the first end.
- the step is constituted by an inner surface on the upstream side of the intake pipe and a wall surface on which the inner surface force on the upstream side is extended, and the step is formed between the inner surface on the upstream side and the wall surface.
- the angle formed is a substantially right angle.
- the step is constituted by an inner surface on the upstream side of the intake pipe and a wall surface extending from the inner surface on the upstream side, and an angle between the inner surface on the upstream side and the wall surface is an obtuse angle. You can.
- an inner surface on a side of the second end, which is opposite to an inner surface on a side of the first end provided with the step, is flush. It is.
- At least a portion of the intake pipe provided with a step is formed by integral molding.
- the step forms a cross section center line of a first portion of the intake pipe upstream of the throttle valve on a downstream side of the first portion.
- the cross-section center line of the second portion disposed adjacent to this portion in the radial direction of the intake pipe. It is formed by offsetting to the second end side of the rottle valve.
- each of the cross-sectional shapes of the first portion and the second portion is circular.
- a poppet valve for opening and closing an outlet of the intake pipe is disposed on one side of an upper portion of the combustion chamber.
- the direction extending upstream of the pipe is a direction extending obliquely upward on the one side, and when the inner surface of the suction pipe at the second end side extends downstream, the upper part of the combustion chamber is closed. It is characterized by reaching the center side.
- the intake pipe downstream of the throttle valve is bent in a substantially arc shape and reaches an upper portion of the combustion chamber.
- one or more throttle valves are provided in the intake pipe for each combustion chamber.
- the throttle valve is an intake valve capable of reducing the amount of air introduced into the combustion chamber to at most the amount of air required for idling.
- the motorcycle of the present invention is a motorcycle including the above-mentioned internal combustion engine.
- the internal combustion engine according to the embodiment of the present invention is provided with a butterfly-type throttle valve that is arranged in an intake passage that connects the atmosphere side to the cylinder and that opens and closes the intake passage.
- a butterfly-type throttle valve that is arranged in an intake passage that connects the atmosphere side to the cylinder and that opens and closes the intake passage.
- the throttle valve is pivotally supported by a member forming the intake passage, and one end of the throttle valve moves toward and returns to the cylinder side around the pivot shaft center, and rotates backward.
- the cross-sectional center line of the first portion of the intake passage upstream of the throttle valve is shifted to the downstream side of the first portion.
- An internal combustion engine characterized in that it is displaced toward one end side of the throttle valve in a radial direction of the intake passage with respect to a center line of a cross section of a second portion of the intake passage arranged adjacent to the one portion. It is.
- One embodiment is characterized in that the first portion is located near the throttle valve.
- each of the first portion and the second portion is circular.
- at least a part of the rotation trajectory of the throttle valve and at least a part of the change portion that changes to the first partial force and the second portion are the same in the longitudinal direction of the intake passage. Characterized in that
- At least a part of the rotation trajectory of the throttle valve and at least a part of the first part are located at the same position in the longitudinal direction of the intake passage. .
- the third portion of the intake passage downstream of the throttle valve is bent so that the center line of the cross section becomes an arc shape, and the inner surface of the third portion is bent.
- the side having the larger bending radius! And the one end of the throttle valve are located on the same side in the radial direction of the third portion of the intake passage.
- a portion of the intake pipe having the throttle valve therein is made of a structure, and a portion of the structure of the structure made of the intake pipe is substantially the same as that of the throttle valve in a longitudinal direction of the intake passage.
- the method is characterized in that only the inner surface of the second portion located in the above is formed by machining.
- the airflow directed toward the second end of the throttle valve is more upstream of the throttle valve than the flow of air directed toward the first end of the throttle valve. Since a step is provided to enhance the flow of air, a clearer tumble flow can be generated in the combustion chamber. Also, at a high load, the degree of opening of the throttle valve becomes large, so naturally the opening force near the first end and the amount of air flowing out from the opening near the second end. The difference with the amount of flow is reduced, so that the formation of the tumble flow can be adjusted. That is, according to the internal combustion engine of the present invention, the tumble flow can be generated and the formation of the tumble flow can be adjusted with a simple configuration.
- FIG. 1 is a cross-sectional view showing a configuration of a conventional internal combustion engine.
- FIG. 2 is a cross-sectional view schematically showing a configuration of an internal combustion engine 100 according to the embodiment of the present invention.
- FIG. 3 (a) is an enlarged cross-sectional view of a main part around a throttle valve, and (b) is a cross-sectional view taken along line ⁇ - (in (a).
- FIG. 4 is a diagram for schematically explaining the operation of the internal combustion engine 100 according to the embodiment of the present invention.
- FIG. 5 is a diagram schematically illustrating an operation of the internal combustion engine 100 according to the embodiment of the present invention.
- FIG. 6 is a cross-sectional view schematically showing a configuration of an internal combustion engine 100 according to the embodiment of the present invention.
- FIG. 7 is an enlarged sectional view of a main part around a throttle valve.
- FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.
- FIG. 9 is a graph showing changes in engine performance when the ignition timing is changed.
- FIG. 10 is a cross-sectional view showing a configuration of a modified example of the internal combustion engine 100 according to the embodiment of the present invention. Explanation of symbols
- the inventor of the present application made the tumble flow clearer with a simple configuration, and adjusted the formation of the tumble flow with a simple configuration (ie, formed a tumble flow at a low load, and adjusted the tumble flow at a high load.
- a simple configuration ie, formed a tumble flow at a low load, and adjusted the tumble flow at a high load.
- the shape of the intake port around the combustion chamber was changed (design change), and the structure around the slot valve, rather than applying the variable valve mechanism, was devised. It has been found that such effects can be obtained by kneading, and the present invention has been accomplished.
- FIG. 2 is a cross-sectional view schematically illustrating a configuration of the internal combustion engine 100 according to the present embodiment.
- FIG. 3 (a) is an enlarged cross-sectional view of a main part around the throttle valve, and FIG. 3 (b) is a cross-sectional view taken along line ⁇ in FIG. 3 (a).
- FIG. 4 is a diagram for schematically explaining the operation of the internal combustion engine 100 of the present embodiment.
- the internal combustion engine 100 of the present embodiment includes a combustion chamber 10 and an intake pipe (intake port) 20 for introducing air into the combustion chamber 10.
- a throttle valve 30 for adjusting an inflow amount of air introduced into the combustion chamber 10 is arranged.
- the throttle valve 30 is provided on a part 22 of the intake pipe 20, and has a first end 30a and a second end 30b.
- upstream 51 of the throttle valve 30 is directed to the first end 30a of the throttle valve 30 more strongly than the flow of air 50.
- a step 40 is provided at the second end 30b to increase the flow of the directional air 50. That is, as shown in FIG. 4, due to the presence of the step 40, the flow of the air 50 from the upstream 51 toward the throttle valve 30 is directed to the first end 3 Oa at the second end rather than the flow 50a.
- Direction to 30b Flow 50b is stronger.
- the flow 50b emerging from the upper first end 30a moves downstream 52 along the upper inner surface 28 of the intake pipe 20, and when introduced into the combustion chamber 10, the tumble flow Form 55.
- the air introduced into the combustion chamber 10 becomes a clearer tumble flow 55, As a result, good ignitability and fast flame propagation can be obtained, and the engine performance can be further improved.
- the throttle valve 30 in the present embodiment is a butterfly type throttle valve, and a pivot shaft 31 that pivotally supports the throttle valve 30 is formed between the first end 30a and the second end 30b. It has been done.
- the second end portion 30b of the throttle valve 30 moves forward and backward around the pivot shaft 31 toward the downstream 52, whereby the opening and closing operations of the throttle valve 30 are executed. . Therefore, if such an operation is performed, it must be performed only when the operation is on the upper side as in the illustrated example. Alternatively, for example, the second end 30b may be on the lower side.
- the step 40 is disposed near the first end 30 a of the throttle valve 30. That is, the level difference 40 is caused by the empty space of the throttle valve 30 (i.e., when the gap between the second end 30b and the intake pipe 20 (22) is small, in other words, when idling or low load). Since it is necessary to function to strengthen the air flow 50b in the part 30b, it is formed at a position where the function is emitted.
- the position of the step 40 may be appropriately set in accordance with the conditions of the internal combustion engine 100, such as specifications.
- the step 40 is located upstream (51) from the position of the first end 30a when the throttle valve 30 is fully closed, and is located at the center position between the first end 30a and the second end 30b. In other words, it may be provided in an area between the pivot shaft 31 and the downstream (52) of the position corresponding to two full lengths of the throttle valve 30.
- the step 40 is located upstream of the position of the first end 30a when the throttle valve 30 is most closed and higher than the position of the first end 30a when the throttle valve 30 is most opened. Formed in the area between the downstream. This is because, when formed in such a region, the effect of increasing the flow of air 5 Ob toward the second end 30b can be improved.
- a step (or a recess forming the step) is formed at a location far away from the vicinity of the first end 30a (for example, a part of the part 23 upstream of the part 22 of the intake pipe 20 in FIG. 2). Even if there is, it does not correspond to the step 40 in the present embodiment because it cannot strengthen the air flow 50b toward the second end 3 Ob.
- the step 40 of the present embodiment is substantially perpendicular. That is, the step 40 is constituted by the inner surface 25 on the upstream side (51) of the intake pipe 20 and the wall surface 27 extending from the inner surface 25 on the upstream side (51).
- the angle formed is a substantially right angle. It should be noted that an oblique angle may be used as long as the step 40 has the effect of increasing the directional air flow 50b toward the second end 30b.
- the portion 22 of the intake pipe 20 provided with the step 40 can be formed by integral molding.
- the portion 22 of the intake pipe 20 where the throttle valve 30 is provided is formed as a throttle body, and the step 40 of the throttle body 22 is formed integrally with the inner surfaces 24, 25, 26 by integral molding.
- the step 40 can be formed.
- the second end of the intake pipe 20 (22) is located opposite to the inner surface (24, 25) on the side of the first end 30a where the step 40 is provided.
- the inner surface 26 on the side of the part 30b is flush. This is because the step 40 is formed on the inner surface (24, 25) on the side of the first end 30a, and the inner surface 26 on the side of the second end 30b is flush with the second end 30b. This is to make the function of strengthening the airflow 50b more effective.
- the step 40 has a portion where the throttle valve 30 is located (a portion of the intake pipe 20 where the inner surface 24 is located) and a portion located upstream of the portion (the inner surface).
- the step 40 is formed by deviating from the position of the intake pipe 20 where 25 is located. More specifically, the cross-sectional center line 02 of the first portion of the intake pipe 20 upstream of the throttle valve 30 is set to the second portion located downstream of the first portion and adjacent to this portion. It is formed by being displaced toward the second end 30b side of the throttle valve 30 in the radial direction of the intake pipe 20 with respect to the cross-sectional center line O1 of FIG.
- each of the cross-sectional shapes of the first portion and the second portion is circular.
- the upper surface 26 coincides with the first portion and the second portion, and a step 40 is formed by the displacement between the lower inner surface 25 and the inner surface 24.
- an intake knob (poppet valve) 14 for opening and closing the outlet 15 of the intake pipe 20 is provided on one side of the upper part of the combustion chamber 10.
- the direction extending from the outlet 15 of the intake pipe 20 to the upstream (51) of the intake pipe 20 is a direction extending obliquely upward at one side.
- the inner surface 28 of the intake pipe 20 on the side of the second end 30b extends toward the downstream (52), it reaches the center of the upper part of the combustion chamber 10.
- the intake pipe 20 downstream (52) of the throttle valve 30 has a structure that bends into a substantially arc shape and reaches the upper part of the combustion chamber 10.
- An exhaust valve (poppet valve) 16 is provided on the other side of the upper part of the combustion chamber 10, and an exhaust pipe (exhaust port) 18 is attached to the back of the exhaust valve 16.
- the piston 12 in the combustion chamber 10 reciprocates up and down, and each process of intake “compression” and “combustion” exhaust is executed.
- the throttle valve 30 is designed to allow the air 50 necessary for idling to pass even when the throttle valve 30 is completely closed.
- the throttle valve 30 controls the amount of air 50 introduced into the combustion chamber 10 by: It is an intake valve (butterfly valve) that can reduce the amount of air required for idling at most.
- a combustion injection valve (not shown) is provided downstream (52) of the throttle valve 30. The fuel injection valve injects fuel into the intake air (50b) flowing from the throttle valve 30, This produces an air-fuel mixture, which forms a tumble flow 55 in the combustion chamber 10.
- the internal combustion engine 100 of the present embodiment is particularly suitable for an engine for a motorcycle.
- motorcycles often use one or more cylinders, with one or more throttle valves installed in the intake pipe, for both single and multiple cylinders! ⁇ Power is also.
- one slot valve is provided at a location where the upstream of an intake passage (intake port) is gathered (for example, see Japanese Unexamined Patent Publication No. Hei.
- one or more throttle valves are provided in the intake pipe for each combustion chamber to improve the response when the intake valve (intake throttle valve) is operated.
- the throttle valve 30 is provided independently for each combustion chamber 10, and the throttle valve 30 is provided near the combustion chamber 10.
- the tumble flow 55 can be generated in the combustion chamber 10 with a strong flow by providing the throttle valve 30 closer to the combustion chamber 10 as compared with that of an automobile.
- the throttle valve performs the same operation in a distant place such as an automobile, a flow that does not contribute to combustion (generation of a tumble flow) does not occur.
- the internal combustion engine 100 of the present embodiment is provided.
- a motorcycle with a simple structure can generate a tumble flow and adjust the formation of the tumble flow, so that a motorcycle with improved engine performance can be provided at low cost.
- the term “motorcycle” in the specification of the present application means a motorcycle, and includes a motorbike (motorbike) and a starter, and specifically refers to a vehicle capable of turning by tilting a vehicle body. . Therefore, even if at least one of the front wheel and the rear wheel is two or more and the number of tires is counted as a tricycle or a four-wheel vehicle (or more), it can be included in the “motorcycle”.
- the present invention is not limited to motorcycles, and can be applied to other vehicles in which a good response when the intake throttle valve is operated is desired.
- vehicles in which a good response when the intake throttle valve is operated is desired.
- ATV All Terrain Vehicle
- a variable valve mechanism may be applied to the internal combustion engine 100 of the present embodiment.
- the upstream end (51) of the throttle valve (butterfly type throttle valve) 30 in the intake pipe 20 and the first end 30a of the throttle valve 30 Since the step 40 is provided at the second end 30b to strengthen the directional air flow 50b rather than the directional air flow 50a, a clearer tumble flow 55 can be generated in the combustion chamber 10. That is, the tumble flow 55 can be easily generated at a low load with a simple configuration.
- the degree of opening of the throttle valve 30 increases, so naturally the amount of air flow 50a exiting from the opening near the first end 30a and the amount of airflow 50a near the second end 30b The difference with the amount of the air flow 50b exiting the opening is reduced, so that the formation of the tumbling flow 55 can be adjusted. That is, it is possible to form a uniform flow in the combustion chamber 10, and it is possible to suppress a decrease in combustion efficiency, a decrease in output, a decrease in fuel efficiency, and the like. Therefore, according to the internal combustion engine 100 of the present embodiment, the tumble flow 55 can be generated with a simple configuration, and the formation of the tumble flow 55 can be adjusted.
- FIG. 6 is a cross-sectional view schematically showing a configuration of the internal combustion engine 100 of the present embodiment
- FIG. 7 is an enlarged view of a main part around a throttle valve.
- FIG. 8 is a view of the sectional force along the line VIII-VIII in FIG.
- the internal combustion engine 100 includes a crankcase that supports a crankshaft (not shown) and a cylinder 102 that also projects the crankcase force.
- the internal combustion engine 100 is viewed from the side with the axis 104 of the cylinder hole 103 in the cylinder 102 coinciding with the vertical line.
- a piston 105 is slidably fitted in the cylinder hole 103 in the axial direction.
- the piston 105 is connected to the crankshaft in an interlocked manner, and a cylinder in the cylinder 102 surrounded by the cylinder 102 and the piston 105 is provided.
- the upper part of the hole 103 is a combustion chamber 106.
- an intake passage 109 for communicating the outside of the cylinder 102 on one side (on the right side in FIG. 6) with the combustion chamber 106, and a combustion chamber 106 of the cylinder 102
- An exhaust passage 110 communicating with the outside on the other side (the left side as viewed in FIG. 6) is formed.
- Each opening of the intake passage 109 and the exhaust passage 110 to the combustion chamber 106 is provided with an intake valve 111 and an exhaust valve 112 that close the respective openings so that they can be opened and closed.
- the intake valve 111 and the exhaust valve 112 can be appropriately operated as an on-off valve by a valve operating mechanism linked to a crankshaft.
- the cylinder 102 is provided with an intake pipe 115 extending from the upper part of the cylinder 102 to one side.
- the inside of the intake pipe 115 is an intake passage (109, 116, 129), and the atmosphere side communicates with the combustion chamber 106 through the intake passage (109, etc.).
- a butterfly type throttle valve 117 that closes the intake passage 116 so as to be openable and closable is disposed in the intake passage 116, and the throttle valve 117 has a disk shape.
- a midway portion of the throttle valve 117 in the radial direction of the intake passage 116 is pivotally supported by a pivot 118 on an intake pipe 115 of a member forming the intake passage 116.
- the throttle valve 117 is rotatable around a pivot shaft center 119 of a pivot shaft 118. Therefore, the one end 120 side (the second end 30b side in FIG. 3) of the throttle valve 117 moves toward the combustion chamber 106 side (that is, downstream) in the cylinder 102, and moves backward (A, B). At the same time, the other end 121 of the throttle valve 117 (the first end 30a side in FIG. 3) moves away from the combustion chamber 106 in the cylinder 102 (ie, in the upstream direction). ), And can make C and D rotations.
- a fuel supply means (fuel injection valve) 125 is attached to the intake passage 109 downstream of the throttle valve 17 to inject and supply the fuel 124 to the combustion chamber 106. That is, the cylinder 102 is provided with the fuel supply means 125 via the intake passage 109. Further, an ignition plug 126 is attached to the combustion chamber 106 so that a discharge portion is exposed.
- a step 40 is provided near the other end 121 of the throttle valve 117.
- the step 40 is formed by a shift between the first portion 129 and the second portion 131 of the intake passage 116. That is, in the side view of the internal combustion engine 100 (see FIG. 7), the sectional center line 130 of the first portion 129 of the intake passage 116 is shifted from the sectional center line 132 of the second portion 131 of the intake passage 116! /, (See also Figure 8).
- the sectional center line 130 of the first part 129 is deviated from the sectional center line 132 of the second part 131 in the radial direction of the intake passage 116 toward one end side 120 of the throttle valve 117. ing. Further, each of the cross-sectional shapes of the first portion 129 and the second portion 131 is circular.
- the first part 129 is a part of the intake passage 116 near the throttle valve 117 and upstream of the throttle valve 117, while the second part 131 is downstream of the first part 129 and It is a part arranged to be adjacent to one part 129.
- the rotation trajectory 138 of the throttle valve 117 and a step (ie, a changed portion) 40 that is a portion that changes from the first portion 129 to the second portion 131 are formed. At least a part of each of them is located at the same position in the longitudinal direction of the intake passage 116.
- the step (change portion) 40 shown in FIG. 7 is a surface substantially orthogonal to the cross-sectional center line 130 of the first portion 129. Therefore, the first portion 129 and the second portion 131 are adjacent to each other in the longitudinal direction of the intake passage 116 so as to be adjacent to each other. Then, the entirety of the step (change portion) 40, a part of the rotation trajectory 138 of the throttle valve 117, and the force intake passage 116 are located at the same position in the longitudinal direction.
- the inclined surface is inclined with respect to the line 130. That is, the step 40 ′ has a truncated cone shape whose cross-sectional area increases from the first portion 129 toward the second portion 131. Therefore, the first portion 129 and the second portion 131 are adjacent to each other across the step (change portion) 40 ′ in the longitudinal direction of the intake passage 116, and Each part of the rotation trajectory 138 is located at the same position in the longitudinal direction of the intake passage 116.
- At least one portion 139 of the rotation trajectory 138 of the throttle valve 117 and at least one portion 139 of the first portion 129 are located at the same position in the longitudinal direction of the intake passage 116, that is, the throttle valve 117 And the first portion 129 are brought closer together in the longitudinal direction of the intake passage 116.
- the third portions 135 of the intake passages 109 and 116 on the downstream side of the throttle valve 117 are formed such that the cross-sectional center line 136 thereof is directed upward to form a convex arc shape.
- This third part 135 is bent. More specifically, the third portion 135 extends upward from the combustion chamber 106 side and upwards, and then extends upward and toward one side of the cylinder 102. The elevation angle of the section center line 136 is to be reduced
- the side of the inner surface of the third portion 135 having the larger bending radius (upper surface side) and the one end portion 120 of the throttle valve 117 are the same in the radial direction of the third portion 135 of the intake passage 116. It is located on the side.
- the intake pipe 115 at least a portion 141 of the intake pipe 115 having the throttle valve 117 therein is made of a structure.
- the portion 141 of the intake pipe 115 in the longitudinal direction of the intake pipe 151, almost the same as the throttle valve 117. Only the inner surface 13 la of the second portion 131 located at the same position is formed by machining to have a circular cross section.
- the cross-sectional center line 130 of the first portion 129 of the intake passage 116 upstream of the throttle valve 117 is moved to the first portion 129 downstream of the first portion 129.
- the second portion 131 of the intake passage 116 disposed adjacent to the intake passage 116 is offset toward one end 120 of the throttle valve 117 in the radial direction.
- the throttle valve 117 is opened (dotted chain line 117 in FIG. 6) to open the intake passages 109, 116.
- the one end side 120 of the throttle valve 117 that performs the valve opening operation makes the forward rotation A toward the cylinder 102 side, so that the air 143 flowing in the intake passages 109 and 116 toward the cylinder 102 side. Most of them pass through the throttle opening 144 between the inner peripheral surface of the intake passage 116 and the one end side 120 of the throttle valve 117 toward the cylinder 102 side.
- the pressure force also forms a step 40 (or 40 ') near the throttle valve 117, the air 143 flowing toward the throttle valve 117 side through the first portion 129 of the intake passage 116 is Therefore, the vehicle is more reliably directed to the throttle opening 144 side.
- the cross-sectional center line 130 of the first portion 129 of the intake passage 116 upstream of the throttle valve 117 is set to the intake passage arranged downstream of the first portion 129 and adjacent to the first portion 129.
- the air 143 flowing through the throttle opening 144 and flowing into the cylinder 102 is more reliably deflected toward the one end 120 of the throttle valve 117 in the radial direction of the intake passage 109, and Therefore, the air 143 sucked into the cylinder 102 becomes a clearer tumble flow 146 together with the fuel 124 supplied by the fuel supply means 125. Thereby, good ignitability by the spark plug 126 and fast flame propagation are obtained, and as a result, engine performance is further improved.
- the first portion 129 is located near the throttle valve 117, and therefore, the first portion 129 is moved closer to the throttle valve 117 by the amount that the first portion 129 approaches the throttle valve 117.
- the air 143 flowing toward the 117 side is more reliably directed to the throttle opening 144 side.
- the air 143 flowing through the throttle opening 144 and flowing into the cylinder 102 is more reliably deflected toward the one end 120 of the throttle valve 117 in the radial direction of the intake passage 109, Since the air 143 is sucked into the cylinder 102, the air 143 sucked into the cylinder 102, together with the fuel 124 supplied by the fuel supply means 125, makes the tumble flow 1 clearer. Accordingly, it is determined that better ignitability and faster flame propagation by the spark plug 126 are obtained, and the engine performance is further improved.
- each of the cross-sectional shapes of the first portion 129 and the second portion 131 is circular, and therefore, the air 143 flowing through the first portion 129 and the second portion 131 is formed. Pressure loss is suppressed to a small value. Accordingly, since the air 143 is sucked into the cylinder 102 more vigorously, the tumble flow 146 is made clearer, and the engine performance is further improved.
- the portions are located at the same position in the longitudinal direction of the intake passage 116, so that the throttle valve 117 and the first portion 129 can approach each other more reliably in the longitudinal direction of the intake passage 116. Can be. Therefore, the air 143 flowing through the first portion 129 of the intake passage 116 toward the throttle valve 117 is immediately directed to the throttle opening 144.
- the air 143 flowing through the throttle opening 144 and flowing into the cylinder 102 is more reliably deflected toward the one end 120 of the throttle valve 117 in the radial direction of the intake passage 109, and Is inhaled. Accordingly, the tumble flow 146 is further defined and engine performance is further improved.
- At least a part 139 of the rotation trajectory 38 of the throttle valve 117 and at least a part 139 of the first part 129 are located at the same position in the longitudinal direction of the intake passage 116. Therefore, the throttle valve 117 and the first portion 129 can approach each other more reliably in the longitudinal direction of the intake passage 116. Therefore, the air 143 flowing through the first portion 129 of the intake passage 116 toward the throttle valve 117 is more reliably immediately directed to the throttle opening 144 side.
- the air 143 flowing through the throttle opening 144 and flowing into the cylinder 102 is more reliably deflected to the one end side 120 side of the throttle valve 117 in the radial direction of the intake passage 109, and As drawn into 102, tumble flow 146 is further defined and engine performance is more reliably enhanced.
- the third portions 135 of the intake passages 109 and 116 downstream of the throttle valve 117 are bent so that the sectional center line 136 becomes an arc shape.
- the side of the inner surface of the third portion 135 having a larger bending radius and the one end portion 120 of the throttle valve 117 are located on the same side in the radial direction of the third portion 135 of the intake passage 109.
- the air 143 flowing toward the third portion 135 of the intake passage 109 into the cylinder 102 flows to the one end 120 of the throttle valve 117 in the radial direction of the third portion 135 of the intake passage 109 due to its inertia. Let me do.
- the air 143 flowing through the intake passage 109 toward the inside of the cylinder 102 through the throttle opening 144 is also deflected to one end 120 of the throttle valve 117 in the radial direction of the intake passage 109.
- the deflected state of the deflected air 143 is further promoted in the third portion 135 of the intake passage 109 described above.
- the portion 141 of the intake pipe 115 having the throttle valve 117 therein is made of a structure, and the portion 141 of the manufactured intake pipe 115 has a throttle in the longitudinal direction of the intake passage 116. Only the inner surface 131a of the second part 131, which is located at substantially the same position as the valve 117, is formed by mechanical calorie.
- the inner surface of the second portion 131 of the intake passage 109 at the throttle opening 144 becomes smooth, so that the flow of the air 143 passing through the throttle opening 144 is made smooth.
- the air 143 that has passed through the throttle opening 144 is more reliably deflected to one end side 120 of the throttle valve 117 in the radial direction of the intake passage 109, so that the engine performance is more reliably improved.
- portion 141 of the intake pipe 115 the other portion deviated from the throttle valve 117 in the longitudinal direction of the intake passage 116 is sufficient after being manufactured, and accordingly, the portion of the intake pipe 115
- the structure and molding of the part 141 can be simplified.
- FIG. 9 is a graph showing engine performance (fuel consumption rate) when the ignition timing is retarded and advanced.
- the vertical axis in the figure indicates the fuel consumption rate, and the horizontal axis indicates the ignition timing. Is shown.
- a broken line (the present invention) in Fig. 9 shows an embodiment corresponding to the embodiment of the present invention.
- the thin solid line (Comparative Example 1) in FIG. 9 indicates that the cross-sectional center lines 130 and 132 of the first portion 129 and the second portion 131 in the intake passage 116 are coaxial with each other and do not form the step 40 in the above embodiment. Show things.
- the thick solid line in FIG. 9 (Comparative Example 2) is the same as in Comparative Example 1 in that the step 40 is not formed in the intake passage 116 coaxially and the reciprocating rotation of the throttle valve 117 (solid line, dashed line) is shown. The result is shown in the opposite direction (two-dot chain line 117 'in FIG. 7).
- engine performance can be improved over a wide range of ignition timing.
- FIG. 10 shows another embodiment of the first portion 129 and the second portion 131 of the intake passage 116.
- the cross-section of the first portion 129 is a force that is generally circular. A portion of the force is linear, whereby the cross-section center lines 130 and 132 are offset from each other.
- the step of the present invention is not limited to the coaxial type because the step 40 can be formed even with the coaxial type.
- the step 40 can be formed by molding including the step 40 without forming the step 40 by machining. It is also possible to form the part 141 including the throttle valve 117 as the second part 131 and the first part 129 as a part of the intake pipe 115 on the upstream side, thereby forming the step 40. is there.
- the axis 104 of the force cylinder hole 103 described above with reference to the illustrated example may be inclined or substantially horizontal with respect to a vertical line. Further, the intake passages 109 and 116 may extend upward from the combustion chamber 106 side and then extend upward and toward the other side of the cylinder 102. In addition, the intake passage 135 may have a straight shape as long as the tumble flow 146 can be satisfactorily formed at a low load. [0099] Although the present invention has been described with reference to the preferred embodiment, such description is not limited and various modifications can be made.
- an internal combustion engine capable of generating a tumble flow with a simple configuration and adjusting the formation of the tumble flow.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003383185A JP2007023772A (ja) | 2003-11-12 | 2003-11-12 | 内燃機関 |
JP2003-383185 | 2003-11-12 |
Publications (1)
Publication Number | Publication Date |
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WO2005047668A1 true WO2005047668A1 (ja) | 2005-05-26 |
Family
ID=34587283
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/016607 WO2005047668A1 (ja) | 2003-11-12 | 2004-11-09 | 内燃機関 |
Country Status (3)
Country | Link |
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JP (1) | JP2007023772A (ja) |
TW (1) | TWI256437B (ja) |
WO (1) | WO2005047668A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012207604A1 (de) | 2012-05-08 | 2013-11-14 | Bayerische Motoren Werke Aktiengesellschaft | Drosselvorrichtung für ein Luftzufuhrsystem |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5544035U (ja) * | 1978-09-14 | 1980-03-22 | ||
JPH02105540U (ja) * | 1989-02-07 | 1990-08-22 | ||
JPH09256859A (ja) * | 1996-03-22 | 1997-09-30 | Nissan Motor Co Ltd | 内燃機関の吸気装置 |
-
2003
- 2003-11-12 JP JP2003383185A patent/JP2007023772A/ja active Pending
-
2004
- 2004-11-09 WO PCT/JP2004/016607 patent/WO2005047668A1/ja active Application Filing
- 2004-11-12 TW TW93134749A patent/TWI256437B/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5544035U (ja) * | 1978-09-14 | 1980-03-22 | ||
JPH02105540U (ja) * | 1989-02-07 | 1990-08-22 | ||
JPH09256859A (ja) * | 1996-03-22 | 1997-09-30 | Nissan Motor Co Ltd | 内燃機関の吸気装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012207604A1 (de) | 2012-05-08 | 2013-11-14 | Bayerische Motoren Werke Aktiengesellschaft | Drosselvorrichtung für ein Luftzufuhrsystem |
Also Published As
Publication number | Publication date |
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TW200530495A (en) | 2005-09-16 |
JP2007023772A (ja) | 2007-02-01 |
TWI256437B (en) | 2006-06-11 |
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