JP3759632B2 - Fuel injection valve arrangement structure for overhead valve internal combustion engine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fuel injection valve arrangement structure for an overhead valve type internal combustion engine with good responsiveness that can increase and decrease an engine output in response to a change in fuel injection amount.
[0002]
[Prior art]
In a conventional overhead valve type internal combustion engine equipped with a fuel injection valve, the longitudinal direction of the intake port and the longitudinal direction of the exhaust port are arranged in a substantially straight line in a plan view as disclosed in Japanese Patent Laid-Open No. 2-161124. Further, in order to avoid interference with intake and exhaust valves and valve gears provided immediately above the openings of both ports, it is located on the outer side of the valve gear and relatively upstream of the intake port, A fuel injection valve is provided so that the fuel injection direction is oriented at an acute angle with respect to the longitudinal direction of the intake port.
[0003]
[Problems to be solved]
In the internal combustion engine described in the above publication, the cylinder head is complicated and tends to increase in size and cost, and the fuel injection direction is not directed to the opening of the intake port, but is directed to the inner peripheral surface of the intake port. During acceleration, fuel injection particles may adhere to the inner peripheral surface of the intake port without being sufficiently atomized and mixed with the intake air flowing through the intake port during acceleration. May not be supplied and the engine output cannot be increased immediately, making it difficult to obtain the desired response.
[0004]
[Means for solving the problems and effects]
The present invention relates to an improvement of such difficulties to overcome the overhead valve type internal combustion engine, the cylinder rows are arranged in a V-shape, the overhead valve V-type internal combustion engine provided with the intake and exhaust valves in the cylinder head, an intake opening and an exhaust opening are arranged along the crankshaft axis direction Rutotomoni, an intake pipe having an intake port, an exhaust pipe and valve system having an exhaust port is disposed laterally within the V-bank, the intake port cylinder It is greatly curved in the vicinity of the intake opening opened in the top combustion chamber, and the injection direction of the fuel injection valve makes a narrow angle with respect to the cylinder center line and intersects with the intake air passing through the intake port at a large angle , and a fuel injection valve that is directed into the intake opening is arranged in a curved outer section of the intake port, and the fuel injection valve arranged in the curved outer section, is parallel to the spark plug to the fuel injection valve, It is characterized in that disposed in serial V bank outside.
[0005]
Since the present invention is configured as described above, the size around the cylinder head can be reduced, the degree of freedom when mounted on the vehicle can be increased, and the cost can be reduced. Further, the fuel injected from the fuel injection valve is the intake port. The intake air flowing through the cylinder can be sufficiently mixed and uniformly mixed, and can smoothly flow into the combustion chamber at the top of the cylinder through the intake opening without adhering to the inner peripheral surface of the intake port. Responsiveness can be greatly improved by immediately increasing or decreasing the engine output in response to changes in the fuel injection amount.
[0006]
【Example】
Hereinafter, an embodiment of the present invention illustrated in FIGS. 1 to 6 will be described.
[0007]
The overhead valve type V-type four-cylinder internal combustion engine 1 is mounted on a passenger car (not shown) with the crankshaft 10 oriented in the vehicle width direction, and is shown at one end of the crankshaft 10 of the overhead-valve type V-type four-cylinder internal combustion engine 1. The overhead transmission type V-type four-cylinder internal combustion engine 1 is integrally provided with a transmission 2 incorporating a clutch that is not used, and two cylinder heads are detachably mounted on two groups of cylinders 8 in a cylinder block 3. 4, a head cover 5 is detachably attached to the cylinder head 4, a crankcase 6 is detachably attached to the bottom of the cylinder block 3, and an oil pan 7 is detachably attached to the lower portion of the crankcase 6. It is installed.
[0008]
Two cylinders 8 are arranged on one side of the cylinder block 3, and the two rows of cylinders 8 are arranged in a V shape at an angle of 90 ° with each other. It is slidably fitted.
[0009]
Further, a crankshaft 10 is disposed at a position where the center line of the cylinder 8 intersects. The crankshaft 10 is rotatably supported by being sandwiched between a cylinder block 3 and a crankshaft holder 13 via a journal bearing 12. The crankpin 11 of the crankshaft 10 and the piston 9 are connected by a connecting rod 14, and the crankshaft 10 is driven to rotate counterclockwise in FIG.
[0010]
Furthermore, the two cylinder heads 4 are located closer to the V bank 15 between the cylinders 8 in the two rows than the center line of the cylinder 8 (see FIG. 5), respectively, near the intake opening 18 and the exhaust opening 19. A greatly bent intake port 16 and exhaust port 17 are arranged, and the exhaust openings 19 of the exhaust ports 17 corresponding to the adjacent cylinders 8 in one row of cylinders 8 come close to each other. 18 is located outside the cylinder row with respect to the exhaust opening 19, and the intake opening 18 and the exhaust opening 19 are arranged in parallel with the cylinder row.
[0011]
Moreover, as shown in FIGS. 4 and 5, the intake port 16 in each cylinder row is connected to the intake chamber 21 via the intake pipe 20 and the exhaust ports 17 in each cylinder row are joined together. The exhaust branch pipe 23 is connected to the exhaust end of the exhaust port 17, and the exhaust branch pipe 23 is combined with the exhaust branch pipe 23 of the opposite cylinder row to provide one. The outer periphery of the exhaust pipe 22 and the exhaust branch pipe 23 is surrounded by a heat insulating pipe 24, and the exhaust pipe 22 is connected to an exhaust gas purification device 25 installed on the transmission 2. The exhaust gas purification device 25 incorporates a three-way catalyst (not shown).
[0012]
Further, an intake pipe 26 communicating with an air cleaner (not shown) is connected above the intake chamber 21, and a throttle valve device 27 for adjusting the intake air amount is attached to the intake pipe 26.
[0013]
Each intake opening 18 and exhaust opening 19 is provided with an intake valve 28 and an exhaust valve 29, respectively, and a valve operating device 30 is disposed near the V bank 15 from the intake valve 28 and the exhaust valve 29.
[0014]
In the valve operating device 30, as shown in FIGS. 1, 3 and 6, the camshaft 31 is positioned in the V bank 15 directly above the crankshaft 10 and in parallel with the crankshaft 10. A cam chain 34 is bridged between a drive sprocket 32 that is pivotally supported and formed at one end of the crankshaft 10, and a driven sprocket 33 that is integrally attached to one end of the camshaft 31, and the cam chain 34 is loosened. A chain tensioner 35 (see FIG. 1) is provided, and the number of teeth of the driven sprocket 33 is set to double the number of teeth of the drive sprocket 32. When the crankshaft 10 rotates, the camshaft 31 is half that number. It is designed to be rotated at a rotational speed of.
[0015]
A swing arm 36 (see FIG. 3) is pivotally supported on the cylinder block 3 so as to be able to swing up and down, and is located near the cylinder 8 from the cam shaft 31, and a cam follower 37 of the swing arm 36 contacts the cam shaft 31. A rocker shaft 39 is mounted on the rocker shaft 39 and is pivotally mounted on the rocker shaft 39 so as to be located near the V bank 15 from the top ends of the intake valve 28 and the exhaust valve 29. When the camshaft 31 is driven to rotate, the swing arm 36 in which the cam follower 37 is in contact with the camshaft 31 is swung up and down. It is transmitted to the rocker arm 40 via the push rod 38, and the intake valve 28 and the exhaust valve 29 are opened intermittently by the rocking motion of the rocker arm 40.
[0016]
Further, each intake port 16 is provided with a fuel injection valve 41 directed to the intake opening 18 at the outer portion where the intake port 16 is greatly bent, and the exhaust opening 18 and the exhaust port 17 of the intake port 16 are exhausted. An ignition plug 42 is provided in the middle of the opening 19 in parallel with the fuel injection valve 41 so that the air-fuel mixture in the combustion chamber 43 is ignited by the spark generated by the ignition plug 42. It has become.
[0017]
Further, as shown in FIGS. 1 and 6, an edge portion 44 is formed at the front end portion (one side end portion with respect to the vehicle body) of the cylinder block 3 and the crankcase 6. A cover member 45 is detachably mounted, and as shown in FIG. 3, the top end of the inner wall portion 46 of the left and right cylinder rows in the cylinder block 3 and the top end of the front and rear end wall portion 47 shown in FIG. A top plate 48 is integrally mounted with bolts 49, and the crank chamber 50 is sealed with the oil pan 7, the cover member 45, and the top plate 48.
[0018]
3 and 6, a partition plate 51 is integrally attached to the lower surface of the top plate 48, and the breather chamber 52 sealed by the top plate 48 and the partition plate 51 is connected to the crank chamber 50 through the opening 53. In addition to the communication, the connection pipe 54 and a connection pipe (not shown) fitted to the connection pipe 54 are connected to the intake chamber 21 or a canister containing an adsorbent (not shown).
[0019]
Further, as shown in FIG. 6, a pulsar rotor 55 is integrally attached to the camshaft 31 adjacent to the driven sprocket 33, and a pickup coil 56 is integrally attached to the cover member 45 adjacent to the outer periphery of the pulsar rotor 55. It has been.
[0020]
Further, as shown in FIG. 2, a casing of a lubricating oil pump 59 is constituted by a cover member 45 and a back plate 58 that is integrally attached to the inner surface of the cover member 45 with screws 57. The inner rotor 60 is integrally fitted to the front end portion of the crankshaft 10.
[0021]
Further, the suction port 61 of the lubricating oil pump 59 is connected to the strainer 64 through the pipe 63, and the discharge port 62 of the lubricating oil pump 59 is connected to the outer space 66 of the filter 65, so that the crankshaft 10 When the lubricating oil pump 59 is driven to rotate, the oil accumulated in the oil pan 7 is sucked into the lubricating oil pump 59 from the strainer 64 through the pipe 63, and is supplied to the lubricating oil pump 59. The pressurized oil is discharged from the discharge port 62 to the outer space 66 of the filter 65, filtered by the element 67, and then from the inner space 68 to each lubricating portion of the overhead valve type V-type four-cylinder internal combustion engine 1. It comes to be supplied.
[0022]
As shown in FIG. 2, a drive pulley 70 is integrally fitted with a bolt 69 to the front end of the crankshaft 10, and the first pulley portion 71 of the drive pulley 70 and the right side of the crankshaft 10 (FIG. 1). Then, the driven pulley 75 of the air conditioner compressor 74 arranged on the left side, the front side with respect to the vehicle body, and the driven pulley 77 of the water pump 76 arranged intermediately between the crankshaft 10 and the air conditioner compressor 74 are 1 An endless belt 82 is laid over, a thermostat 79 is interposed in the suction port 78 of the water pump 76, and a discharge port 80 of the water pump 76 is connected to a cooling water suction opening 81 near the left and right cylinders 8 in the cylinder block 3. It is communicated to.
[0023]
Further, an AC generator 83 is disposed on the left side (the right side in FIG. 1) opposite to the air conditioner compressor 74 with the crankshaft 10 interposed therebetween, and the driven pulley 84 of the AC generator 83 and the second pulley portion 72 of the drive pulley 70 are arranged. A second endless belt 85 is laid over the camshaft 31, and a power steering oil pump 86 is disposed above the driven sprocket 33 of the camshaft 31, and the driven pulley 87 and the drive of the power steering oil pump 86 are disposed. A third endless belt 88 is laid over the third pulley portion 73 of the pulley 70, and when the crankshaft 10 rotates, the AC generator 83 and the power steering oil pump 86 are driven to rotate. .
[0024]
Further, as shown in FIG. 2, a flywheel 89 is integrally attached to the rear end (right end in FIG. 2) of the crankshaft 10, and is connected to an input shaft (not shown) of the transmission 2 of the flywheel 89. The output shaft 90 (see FIGS. 1 and 3) of the transmission 2 is connected in parallel with the crankshaft 10, and the output shaft 90 is connected to a front wheel (not shown) of a vehicle via a transmission mechanism (not shown). When the crankshaft 10 rotates, power is transmitted to the front wheels after the transmission 2 is changed to a required gear ratio.
[0025]
In addition, a fuel pipe 91, which is adjacent to the fuel injection valve 41 and laid in parallel with the crankshaft 10, is connected to the upper end of the fuel injection valve 41, and is sucked up from a fuel tank (not shown) to be a fuel pump (not shown). The fuel circulating in the fuel pipe 91 is supplied to the fuel injection valve 41.
[0026]
92 is an oil level gauge.
[0027]
Since the embodiment shown in FIGS. 1 to 6 is configured as described above, when the overhead valve V-type four-cylinder internal combustion engine 1 is cranked, the filtered air filtered by an air cleaner (not shown) The throttle valve device 27 adjusts the intake air amount to a required value, and the air is sucked into the intake chamber 21 and flows into the intake port 16 from the intake chamber 21 via the intake pipe 20. The fuel is supplied to the combustion chamber 43 through the opened intake valve 28, and the fuel is supplied from the fuel injection valve 41 to the combustion chamber 43 through the intake port 16 at the same timing. After the valve is closed, the air-fuel mixture is ignited by a spark generated from the spark plug 42 at a required timing.
[0028]
The piston 9 is pushed down by the combustion gas thus ignited, the crankshaft 10 starts rotating, the power is transmitted to the wheels of the passenger car via the transmission 2, and the passenger car can travel.
[0029]
Further, the exhaust combustion gas combusted in the combustion chamber 43 flows into the exhaust gas purification device 25 from the exhaust port 17 through the exhaust branch pipe 23 and the exhaust pipe 22, and the catalyst in the exhaust gas purification device 25 NO _X , CO and other harmful gases are removed and released into the atmosphere, and the exhaust pipe 22 and the exhaust branch pipe 23 are heated to a high temperature by the high-temperature exhaust combustion gas flowing therethrough. Since the outer periphery of the pipe 23 is sealed by the heat insulation pipe 24, even if the intake pipe 20, the intake chamber 21, and the throttle valve device 27 are located above the exhaust pipe 22 and the exhaust branch pipe 23, these intake systems Heating is not affected by the exhaust combustion gas flowing in the exhaust pipe 22 and the exhaust branch pipe 23, and the charging efficiency can be maintained at a high level.
[0030]
Further, the exhaust pipe 22 and the exhaust branch pipe 23 are not cooled significantly, and are kept at a high temperature by the heat insulation pipe 24. Therefore, the exhaust combustion gas flowing into the exhaust gas purification device 25 from the exhaust pipe 22 is purified. Sufficient oxidation / reduction reaction occurs with the catalyst in the device 25, and the emission of harmful gas is very low.
[0031]
Furthermore, since only one exhaust gas purifying device 25 is sufficient, the cost can be reduced.
[0032]
The intake valve 28 and the exhaust valve 29 are located near the V bank 15 from the center of each cylinder 8 and are arranged in a substantially straight line along the arrangement direction of the cylinders 8, that is, the longitudinal direction of the crankshaft 10. Since it is driven by one camshaft 31, the structure of the valve operating device 30 is remarkably simplified, and a great reduction in weight and cost can be achieved.
[0033]
Furthermore, the cylinder head 4 can be reduced in size, and the overhead valve type V-type four-cylinder internal combustion engine 1 can be freely installed when the vehicle is mounted, and the cost can be reduced.
[0034]
Furthermore, a lubricating oil pump 59 is provided at the shaft end of the crankshaft 10. A pulsar rotor 55 and a power steering oil pump 86 are arranged above the lubricating oil pump 59, and an air conditioner compressor 74 and an alternating current are arranged on the left and right sides of the lubricating oil pump 59. Since the generator 83 is disposed and the water pump 76 is disposed substantially in the middle between the pulsar rotor 55 and the air conditioner compressor 74, these auxiliary machines are compactly assembled.
[0035]
In addition, since the intake port 16 and the exhaust port 17 are arranged near the V bank 15, the valve gears 30 respectively provided in the intake port 16 and the exhaust port 17 are also located near the V bank 15, The fuel injection valve 41 can be disposed on the opposite side of the V bank 15 without interfering with the valve operating device 30.
[0036]
As a result, the fuel injection valve 41 is directed toward the intake opening 18 and directed in a direction close to the center line of the cylinder 8 so as to cross the intake air passing through the intake port 16 at a large angle so that the injected fuel becomes uniform with the intake air. It can be mixed and supplied to the combustion chamber 43 without causing the injected fuel to adhere to the inner peripheral surface of the intake port 16, and the engine output is increased or decreased immediately in response to the fuel injection amount, thereby improving the response. Can be improved.
[0037]
Further, as shown in FIG. 7, the present invention is applicable to an overhead valve type V-type 8-cylinder internal combustion engine 93 having four cylinders on one side and eight cylinders as a whole.
[Brief description of the drawings]
FIG. 1 is a front view illustrating an embodiment of an intake / exhaust structure of an overhead valve type V-type four-cylinder internal combustion engine according to the present invention.
FIG. 2 is a longitudinal side view cut along the line II-II in FIG. 1;
3 is a partial longitudinal sectional view taken along line III-III in FIG.
4 is a plan view of FIG. 1. FIG.
5 is a VV arrow view of FIG.
6 is a longitudinal side view cut along the line VI-VI in FIG. 3. FIG.
FIG. 7 is a plan view of another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Overhead type V type 4 cylinder internal combustion engine, 2 ... Transmission, 3 ... Cylinder block, 4 ... Cylinder head, 5 ... Head cover, 6 ... Crankcase, 7 ... Oil pan, 8 ... Cylinder, 9 ... Piston, 10 ... crankshaft, 11 ... crankpin, 12 ... journal bearing, 13 ... crankshaft holder, 14 ... connecting lot, 15 ... V bank, 16 ... intake port, 17 ... exhaust port, 18 ... intake opening, 19 ... exhaust opening, 20 ... Intake pipe, 21 ... Intake chamber, 22 ... Exhaust pipe, 23 ... Exhaust branch pipe, 24 ... Heat insulation pipe, 25 ... Exhaust gas purification device, 26 ... Intake pipe, 27 ... Throttle valve device, 28 ... Intake valve, 29 ... exhaust valve, 30 ... valve device, 31 ... camshaft, 32 ... drive sprocket, 33 ... driven sprocket, 34 ... cam chain, 35 ... chain tensioner, 36 ... swing arm, 37 ... cam follower, 38 ... push rod, 39… Rocker Shaf , 40 ... Rocker arm, 41 ... Fuel injection valve, 42 ... Spark plug, 43 ... Combustion chamber, 44 ... Edge, 45 ... Cover member, 46 ... Inner wall, 47 ... Front and rear end walls, 48 ... Top plate, 49 ... Bolt, 50 ... crank chamber, 51 ... partition plate, 52 ... breather chamber, 53 ... opening, 54 ... connecting pipe, 55 ... pulsar rotor, 56 ... pickup coil, 57 ... screw, 58 ... back plate, 59 ... lubricating oil Pump, 60 ... Rotor, 61 ... Suction port, 62 ... Discharge port, 63 ... Pipe, 64 ... Strainer, 65 ... Filter, 66 ... Outer space, 67 ... Element, 68 ... Inner space, 69 ... Bolt, 70 ... Drive pulley 71 ... 1st pulley part, 72 ... 2nd pulley part, 73 ... 3rd pulley part, 74 ... Compressor for air conditioner, 75 ... Driven pulley, 76 ... Water pump, 77 ... Driven pulley, 78 ... Suction port, 79 ... Thermostat, 80 ... discharge port, 81 ... cooling water suction opening, 82 ... first endless belt, 83 AC generator, 84 ... driven pulley, 85 ... second endless belt, 86 ... oil pump for power steering, 87 ... driven pulley, 88 ... third endless belt, 89 ... flywheel, 90 ... output shaft, 91 ... fuel pipe , 92 ... Oil level gauge, 93 ... Overhead valve type V-type 8-cylinder internal combustion engine.

Claims (2)

In the overhead valve type V-type internal combustion engine in which the cylinder row is arranged in a V shape and the cylinder head is provided with intake and exhaust valves,
An intake opening and an exhaust opening are arranged along the crankshaft axis direction Rutotomoni, an intake pipe having an intake port, an exhaust pipe and valve system is disposed in the V-bank side having an exhaust port,
The intake port is greatly curved in the vicinity of the intake opening opened to the combustion chamber at the top of the cylinder,
An injection direction of the fuel injection valve forms a narrow angle with respect to the cylinder center line, intersects with intake air passing through the intake port at a large angle , and is directed to the intake opening. Placed in the curved outer part,
A fuel injection valve for an overhead valve type internal combustion engine, characterized in that the fuel injection valve arranged at the outer side of the curve and a spark plug parallel to the fuel injection valve are arranged outside the V bank. Placement structure.   2. The fuel injection valve arrangement structure for an overhead valve type internal combustion engine according to claim 1, wherein the intake opening of the intake port and the exhaust opening of the exhaust port are arranged in parallel with a crankshaft of the internal combustion engine.

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