JP4057714B2 - Cooling device for V-type internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling device for a V-type internal combustion engine in which water jackets are formed in first and second banks of the V-type internal combustion engine.
[0002]
[Prior art]
Conventionally, as a cooling device for such a V-type internal combustion engine, for example, as disclosed in JP-A-58-96121, a water pump is provided with two discharge pipes, Two upstream water pipes individually connected to the lower part of the water jacket of the second bank are connected, and two downstream water pipes individually connected to the upper part of the water jackets of the first and second banks are connected to the inlet of the radiator. The one connected to the common water pipe of the book is known.
[0003]
[Problems to be solved by the invention]
In the conventional configuration described above, two relatively long upstream water pipes and downstream water pipes are required, so it is difficult to say that these pipes are conspicuous and the appearance is good.
[0004]
The present invention has been made in view of such circumstances, so that the cooling water discharged from the water pump can be sequentially supplied to the water jackets and the radiators of the first and second banks with less noticeable piping. An object of the present invention is to provide a cooling device for the V-type internal combustion engine.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides a cooling apparatus for a V-type internal combustion engine in which first and second water jackets are formed in the first and second banks of the V-type internal combustion engine. The discharge pipe of the water pump is connected, the lower part of the water jacket of the first bank is connected to the lower part of the water jacket of the second bank through the lower communication pipe, and the upper part of the water jacket of the first bank is formed in the second bank. In the merge room that continues to the top of the water jacket, An upper joint attached to the lower surface of the portion of the cylinder head of the second bank that protrudes toward the valley between the first and second banks, and is connected to the upper jointUpper communication water pipeWhenCommunicating via the lower and upper communicating water pipesSaidThe first feature is that it is arranged in the valley.
[0006]
  According to the first feature, the cooling water discharged from the water pump is first supplied to the water jacket of the first bank, and then supplied to the water jacket of the second bank through the lower communication pipe to cool the first bank. Cooling water, An upper communication water pipe, and an upper joint attached to the lower surface of the portion of the cylinder head of the second bank that protrudes to the valley side between the first and second banks,After moving to the merging chamber of the second bank, the second bank merges with the cooled cooling water and then flows out to the radiator, and the cooling water is uniformly supplied to the water jackets of the first and second banks. be able to.
[0007]
In addition, the lower and upper communicating water pipes need only be relatively short, and are disposed in the valleys between the two banks, so that they are not conspicuous and hidden between the two banks, and the appearance of the internal combustion engine is not impaired.
[0008]
  In addition to the above features, the present invention providesThe merge room is placed over the front of the second bank,A second feature is that a thermostat for opening and closing the outlet is installed in the merge chamber, and the outlet joint of the chamber communicates with the inlet of the radiator.
[0009]
  According to this second feature,The merge room is placed in front of the second bank,The cooling water that has cooled the first and second banks joins the thermostat.the aboveIn the merge room, Located on the upper surface of the upper jointBecause it is installed, the thermostat can accurately sense the average water temperature in both banks and perform appropriate water temperature control in both banks. In addition, piping for the thermostat is not necessary, and piping can be simplified.
[0010]
Furthermore, in addition to the first or the second feature, the present invention has the first and second banks arranged at the front and the rear when the internal combustion engine is mounted on a motorcycle, and the outlet of the merge chamber is disposed on the upper front surface of the second bank. A third feature is that a joint is provided and the outlet joint communicates with an inlet of a radiator disposed in front of the internal combustion engine via a water pipe.
[0011]
According to the third feature, it is possible to reduce the bending of the water pipe connecting the junction chamber and the radiator, to suppress the flow path resistance, and to improve the appearance.
[0012]
Furthermore, in addition to any one of the first to third features, the present invention couples an upper joint that connects the upper communication water pipe to the second bank and communicates with the upper joint with a smaller diameter to the merge chamber. A fourth feature is that a bypass outlet joint is integrally formed, and a bypass water pipe connected to the suction pipe of the water pump is connected to the bypass outlet joint.
[0013]
According to the fourth feature, the piping work can be simplified by integrating the upper joint and the bypass outlet joint coupled to the second bank.
[0014]
Furthermore, the present invention is characterized in that, in addition to the fourth feature, the bypass channel is provided with a greenhouse of the carburetor of each bank.
[0015]
According to the fifth feature, the icing of the vaporizers in both banks can be prevented by the cooling water passing through the bypass channel.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0017]
1 is a side view of a motorcycle equipped with a V-type internal combustion engine of the present invention, FIG. 2 is a side view of the internal combustion engine, FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, and FIG. 4 is a sectional view taken along line 5-5 in FIG. 2, FIG. 6 is a cooling water system diagram of the internal combustion engine, FIG. 7 is a sectional view taken along line 7-7 in FIG. 2, and FIG. FIG. 9 is an enlarged view around the transmission of FIG. 3, FIG. 10 is a plan view around the exhaust system of the internal combustion engine, and FIG. 11 is a plan view of the cylinder head of the rear bank. 12 is a view taken in the direction of arrow 12 in FIG.
[0018]
In the description, front and rear and left and right are based on the motorcycle body.
[Overall configuration of motorcycle (see FIGS. 1 and 2)]
A front fork (both not shown) that supports the front wheels is connected to the front end of the body frame 1 of the motorcycle M so as to be steerable. A rear fork 3 that supports the rear wheel 2 is connected to the rear portion of the vehicle body frame 1 so as to swing up and down, and a rear cushion 7 is interposed between the rear fork 3 and each rear end portion of the vehicle body frame 1. .
[0019]
In the middle part of the body frame 1, there are front and rear banks 4₁, 4₂Is mounted, and a fuel tank 5 is mounted above the V-type internal combustion engine E. Further, a main seat 6 a and a pillion seat 6 b are attached to the rear portion of the vehicle body frame 1 so as to be continuous with the rear end of the fuel tank 5.
[0020]
The chain transmission 10 that connects the output shaft 97 of the transmission 8 connected to the internal combustion engine E and the hub of the rear wheel 2 is disposed on the left side of the rear wheel 2. The starter motor 11 is disposed in front of and below the crankshaft 15.
[0021]
Front and rear banks 4 of the internal combustion engine E₁, 4₂Between the valleys 28 are the front and rear vaporizers 12 connected to the corresponding banks.₁, 12₂Is disposed. Front bank 4₁Front and rear bank 4₂Front exhaust pipe 13 connected to the rear part respectively₁And rear exhaust pipe 13₂Are connected together at the front end of a common exhaust muffler 14 disposed on the opposite side of the chain transmission 10 across the rear wheel 2, that is, on the right side of the rear wheel 2.
[Overall configuration of internal combustion engine (see FIGS. 2, 3, 5, 8)]
Front bank 4 of internal combustion engine E₁And rear bank 4₂Are arranged 90 ° around the crankshaft 15 arranged in the left-right direction and arranged in the front-rear direction. The crankshaft 15 includes a single crank portion 16 having a crank pin 16a, and a pair of left and right journals 17 and 18 adjacent to both ends thereof, and the journals 17 and 18 have ball bearings 19 and 20, respectively. Via the crankcase 21.
[0022]
Front and rear bank 4₁, 4₂Is a cylinder block 22 for joining the crankshaft 15 to the front and rear slopes of the upper portion of the mountain shape of the crankcase 21.₁, 22₂And cylinder heads 23 joined to the upper ends thereof.₁, 23₂And each cylinder block 22₁, 22₂And cylinder head 23₁, 23₂In the series of water jackets 24₁, 24₂Is formed.
[0023]
Each cylinder block 22₁, 22₂Cylinder bore 25₁, 25₂Piston 26 fitted in₁, 26₂Is connecting rod 27₁, 27₂And connected to the crank pin 16a. At that time, rear bank 4₂The connecting rod 27₂Is the front bank 4 on the crankpin 16a.₁The connecting rod 27₁Are arranged adjacent to the left of these connecting rods 27₁, 27₂Corresponding to the horizontal offset amount S (FIG. 8) of the rear bank 4₂Is the front bank 4₁Offset to the left with respect to the axis.
[0024]
As shown in FIG. 5, at the right end of the crankshaft 15 protruding outward from the right journal 18, the overrunning clutch 53 of the starter transmission 94 and the primary transmission 54 connected to the clutch 100 are sequentially arranged from the inside. A drive gear 54a is attached and arranged adjacent to each other. At this time, the outer member of the overrunning clutch 53 is splined to the crankshaft 15, and the starter gear 52 is fixed to the inner member. The drive gear 54a is key-coupled to the crankshaft 15.
[0025]
Further, as shown in FIG. 8, the left end portion of the crankshaft 15 protruding outward from the left journal 17 has a front bank 4 in order from the inside.₁Valve camshaft 41₁Front timing transmission 46 for driving₁Drive timing sprocket 42₁, Rear bank 4₂Valve camshaft 41₂Rear timing transmission 46 for driving₂Drive timing sprocket 42₂, And the rotor 31 of the generator 30 are mounted and arranged adjacent to each other. At that time, the rotor 31 is key-coupled to the crankshaft 15. Two drive timing sprockets 42₁, 42₂The mounting structure will be described later.
[0026]
The stator 32 of the generator 30 surrounded by the rotor 31 is fixed to the inner wall of the left cover 33 joined to the left end surface of the crankcase 21.
[0027]
A protrusion 35 is formed at the position of the outer peripheral surface of the rotor 31, and a crank position sensor 36 that detects the rotational position of the crankshaft 15 in cooperation with the protrusion 35 is fixed to the left end surface of the crankcase 21. The output signal of the crank position sensor 36 is used as an ignition device control signal or a tachometer input signal.
[0028]
On the right end of the crankshaft 15 opposite to the generator 30, a start gear 52 is supported via an overrunning clutch 53 adjacent to the right journal 18, and further, the primary drive is adjacent to the start gear 52. The gear 54a is key-coupled.
[0029]
When configured as described above, the front and rear timing transmissions 46 on the left end side of the crankshaft 15 are provided.₁, 46₂Can be assembled at once, and their assemblability is improved. Also the front and rear timing transmission 46₁, 46₂When the maintenance is performed, the maintenance can be easily performed by removing only the outer generator 30 from the crankshaft 15 and without interfering with anything else. Moreover, both timing transmissions 46 of the generator 30₁, 46₂Due to the adjacent arrangement, both timing transmissions 46 are in operation.₁, 46₂Since the splashed oil splashes on the generator 30, it can be cooled effectively.
[0030]
Further, the front and rear timing transmissions 46 are provided on the left side of the crankcase 21.₁, 46₂Since the starter transmission device 94, the primary transmission device 54, and the clutch 100 are disposed on the other side of the generator 30, the weight balance on both sides of the crankcase 21 is good, and therefore the body frame When mounted on 1, the right and left weight balance of the motorcycle M can be easily achieved.
[Valve system (see FIGS. 2 to 4, 8, 9)]
Each bank 4₁, 4₂Cylinder head 23₁, 23₂Intake valve 37₁, 37₂And exhaust valve 38₁, 38₂However, the intake valve 37₁, 37₂Both banks 4₁, 4₂It is provided close to the valley portion 28 side. Each cylinder head 23₁, 23₂The corresponding intake and exhaust valve 37₁, 37₂; 38₁, 38₂Rocker arm 39₁, 39₂40₁, 40₂Cam shaft 41 that opens and closes via₁, 41₂Are supported by ball bearings 50 and 50 'in parallel with the crankshaft 15, respectively. Then, a drive timing sprocket 42 fixed to the left end portion of the crankshaft 15₁, 42₂And each bank 4₁, 4₂Camshaft 41₁, 41₂Driven sprocket 43 fixed to the left end of the₁, 43₂And timing chain 44₁44₂Is wrapped around. Both drive timing sprockets 42₁, 42₂Is provided with a common boss 45 press-fitted adjacent to the outer end of the left journal 17 of the crankshaft 15.
[0031]
Thus, front bank 4₁Drive timing sprocket 42₁, Timing chain 44₁And driven timing sprocket 43₁The corresponding camshaft 41 reduces the rotation of the crankshaft 15 to 1 in 2 minutes.₁Front timing transmission 46 to transmit to₁Which consists of front bank 4₁The front timing transmission chamber 47 formed on the side wall of the generator 30 side₁Placed in. Rear bank 4₂Drive timing sprocket 42₂, Timing chain 44₂And driven timing sprocket 43₂The corresponding camshaft 41 reduces the rotation of the crankshaft 15 to 1 in 2 minutes.₂Rear timing transmission 46 to transmit to₂That also constitutesrear Partbank4 ₂ The rear timing transmission chamber 47 formed on the side wall of the generator 30 side₂Placed in.
[0032]
In that case, the rear timing transmission 46₂The front timing transmission 46₁It is arranged more axially outside, that is, on the generator 30 side.
[0033]
The crankshaft 15 rotates counterclockwise as indicated by an arrow R in FIG.₁44₂The back side is the slack side. In order to give a certain tension to the slack side, each timing chain 44₁44₂On the slack side, an arcuate chain tensioner 48 pivotally supported by the crankcase 21 is supported.₁, 48₂These chain tensioners 48 are slidably contacted.₁, 48₂Corresponding timing chain 44 in the longitudinal center₁44₂A known tensioner lifter 49 that presses with a constant load toward₁, 49₂Is each bank 4₁, 4₂Cylinder block 22₁, 22₂Each bolt 109 is attached to a mounting surface formed on the rear surface.
[0034]
  The crankcase 21 is divided into a left case half 21a and a right case half 21b at the left and right central portions thereof, and outer races of the ball bearings 19 and 20 are attached thereto by light press fitting in advance, and both case halves 21a , 21b, the left and right journals 17, 18 of the crankshaft 15 are lightly press-fitted into the inner races of the ball bearings 19, 20, respectively. Drive timing sprocket 42 in which a boss 45 common to the shaft 15 is press-fitted₁ , 42₂ Drive timing sprocket 42 so that can pass through the inner race of the left ball bearing 19.₁ , 42₂ Outside diameter d₁ Is the inner diameter d of the inner race of the ball bearing 19.₂ Set slightly smaller. Therefore, when the crankshaft 15 is used alone, the double drive timing sprocket 42 is used.₁, 42₂ Boss 45 can be press-fitted,SoCan be easily performed. Further, by lightly press-fitting the ball bearings 19 and 20 into the left and right case halves 21a and 21b and the left and right crank journals 17 and 18, vibrations of the ball bearings 19 and 20 can be suppressed and noise can be reduced during engine operation. Can do.
[Exhaust system (see FIGS. 2, 10 and 11)]
  Front bank 4₁ Exhaust port 51₁ The outlet of the cylinder head 23₁ The front exhaust pipe 13 is opened to the front of the front exhaust pipe 13.₁ Are connected at their upstream ends. Rear bank 4₂ Exhaust port 51₂ The outlet of the cylinder head 23₂ Rear, rear timing transmission 46₂ Is opened on the right side opposite to the rear exhaust pipe 13.₂ Are connected at their upstream ends.
[0035]
Front exhaust pipe 13₁And rear exhaust pipe 13₂Are both front and rear chain transmissions 46.₁, 46₂On the right side of the internal combustion engine E on the opposite side, and piped vertically, and connected to an exhaust muffler 14 arranged downstream of the rear wheel 2 with the downstream ends assembled.
[0036]
Thus, the front bank 4 of the internal combustion engine E as described above.₁Rear bank 4 against₂Front and rear timing transmissions 46 on one side of the offset direction side₁, 46₂The front and rear exhaust pipes 13 are arranged on the other side of the internal combustion engine E.₁, 13₂Are arranged side by side and concentrated piping, so both timing transmissions 46₁, 46₂And both exhaust pipes 13₁, 13₂Both exhaust pipes 13 should be easily avoided.₁, 13₂The total width of the internal combustion engine E including can be reduced as much as possible.
[0037]
Rear bank 4₂Cylinder head 23₂Exhaust port 51 opening on the right side of the rear part₂And a rear exhaust pipe 13 piped to the right side of the motorcycle M.₂Is connected to the rear exhaust pipe 13₂This can reduce the bend of the pipe, lower its pipe resistance, and contribute to improved output performance.
[Transmission system (see Fig. 2, Fig. 3 and Fig. 9)]
The crankcase 21 has a rear bank 4₂A transmission case portion 95 is integrally formed on the lower portion of the transmission case 95, and an input shaft 96 and an output shaft 97 of the transmission 8 are arranged in the transmission case portion 95 immediately after the crankshaft 15 and in parallel therewith. Each of which is housed in a pair of ball bearings98, 98 '; 99 , 99 'Is supported on the left and right side walls of the mission case portion 95 via the. An inner member 101 of the clutch 100 covered by a right cover 34 joined to the right side surface of the crankcase 21 is splined to the right end portion of the input shaft 96, and the primary member is connected to the inner end of the outer member 102. A primary driven gear 54b which is engaged with the drive gear 54a and constitutes the primary transmission 54 is attached. Between the input shaft 96 and the output shaft 97, there are a plurality of (in the illustrated example, five) transmission gear trains G.₁~ G_FiveAre arranged to be selectable.
[0038]
The left side wall 95a (see FIG. 9) of the mission case portion 95 that supports the left end portions of the input shaft 96 and the output shaft 97 is provided on the rear bank 4.₂Timing transmission device 46₂It is formed so as to be offset to the right. Therefore, rear bank 4₂Timing transmission device 46₂Tensioner lifter 49₂Back bank 4₂Cylinder block 22₂When attached to the rear surface, interference with the mission case portion 95 can be avoided.
[0039]
In particular, rear bank 4₂Timing transmission device 46₂The front bank 4₁Timing transmission device 46₁Since it is arranged further outward, that is, to the left, the amount of offset of the transmission case 95 to the right of the crankcase 21 can be minimized and the internal combustion engine E can be made compact.
[Vehicle speed sensor (see FIGS. 2, 9 and 12)]
A mounting hole 103 is provided in the rear wall of the mission case portion 95, and a vehicle speed sensor 105 that allows the detecting portion 105 a to enter the mission case portion 95 through the hole 103 is fixed to the rear wall of the mission case portion 95 with a bolt 110. The vehicle speed sensor 105 has a detecting portion 105a whose top driven gear, that is, a top gear train G._FiveIt arrange | positions so as to oppose the tooth-tip of the driven gear 104 of this.
[0040]
The top driven gear 104 is spline-fitted to the output shaft 97 and is shifted to the left by the second gear train G₂This shift also serves as a shift gear, and the outer periphery of the gear does not deviate from the detection area of the vehicle speed sensor 105 even by the shift. The vehicle speed sensor 105 outputs a signal corresponding to the number of teeth of the top driven gear 104 that passes immediately before the detection unit to a computer (not shown). The computer calculates the vehicle speed from the input signal, and Displayed on a speedometer (not shown) on an instrument panel (not shown).
[0041]
Thus, since the vehicle speed sensor 105 can be mounted on the rear wall of the transmission case portion 95 so as to detect the rotation speed of the top driven gear 104 that always rotates with the output shaft 97 as the vehicle speed, the vehicle speed sensor 105 is attached to the transmission case. Rear bank 4 tilted backward to the side 95₂Of course, the rear exhaust pipe 13 is attached to the rear part.₂It can be done without any interruption.
[0042]
A rib 106 that covers the lower surface of the vehicle speed sensor 105 is integrally formed on the rear surface of the transmission case portion 95, and a through hole 107 through which the lead wire 108 of the vehicle speed sensor 105 passes is formed at the center of the rib 106. .
[0043]
Further, as shown in FIG. 2, a pair of left and right hanger portions 112 are provided on the rear surface of the mission case portion 95.₁, 112₂However, a pair of left and right hangers 112 are disposed on the front surface of the crankcase 21._ThreeAre hung from the hanger 112 when the internal combustion engine E is mounted on the body frame 1.₁, 112₂, 112_ThreeIs coupled to the vehicle body frame 1. Hanger part 112 of two sets of rear parts₁, 112₂The vehicle speed sensor 105 is disposed by utilizing a dead space behind the mission case portion 95, and space efficiency can be improved.
[0044]
Thus, the rib 106 functions to protect the vehicle speed sensor 105 from gravel flying from below while the motorcycle M is running, and the through-hole 107 through which the lead wire 108 passes enters the rib 106. It also functions as an outlet for rainwater and washing water.
[Lubrication and cooling system (see FIGS. 2, 3, 5 and 6)]
As shown in FIGS. 2, 3 and 5, the primary drive gear 54a key-coupled to the right end portion of the crankshaft 15 is provided with a pump drive gear 56 and a primary driven gear 54b at two different locations in the circumferential direction. Meshed.
[0045]
The pump drive gear 56 is key-coupled to a pump shaft 61 supported via a bearing 86 on the right cover 34 joined to the right end surface of the crankcase 21. The pump shaft 61 is arranged so that it is parallel to the crankshaft 15 and forward and upward.
[0046]
An inner rotor of a trochoid oil pump 57 for lubrication is provided at the inner end of the pump shaft 61.58However, at the outer end, the impeller of the cooling water pump 62 is provided.63Are fixed respectively. The pump housing 60 that houses the outer rotor 59 of the oil pump 57 is screwed to the partition wall 65 of the crankcase 21 that supports the ball bearing 20. The pump casing 64 that houses the impeller 63 is fixed to the outer surface of the right cover with bolts 87. Thus, the oil pump 57 and the water pump 62 are coaxially arranged above and in front of the crankshaft 15, and the oil pump 57 is arranged adjacent to the outer side of the overrunning clutch 53 in the radial direction. The case 21 is provided.
[0047]
The suction port of the oil pump 57 is connected to a strainer 67 (see FIG. 2) installed in an oil reservoir 66 at the bottom of the crankcase 21 via a suction pipe 68, and the discharge port is connected to an oil supply passage 69. Crankshaft 15 and each bank 4₁, 4₂Camshaft 41₁, 41₂It communicates with other lubrication parts.
[0048]
An oil filter 70 located approximately right above the crankshaft 15 is interposed in the middle of the oil supply passage 69. The oil filter 70 is attached to a filtration chamber 71 formed in the right cover 34, and a cap 72 that closes the opening of the chamber 71 is fixed to the right cover 34. In the filtration chamber 71, the inlet chamber 71 a on the outer peripheral side of the oil filter 70 communicates with the discharge port of the oil pump 57 via the upstream portion 69 a of the oil supply passage 69 formed in the crankcase 21. The peripheral outlet chamber 71 b communicates with two branch oil passages 69 b and 69 c of an oil supply passage 69 formed in the cap 72, and one branch oil passage 69 b communicates with a lubricating portion 73 of the crankshaft 15 system. The other branch oil passage 69c further branches into the front and rear branch oil passages 69d and 69e at the joint surface of the crankcase 21 and the right cover 34, and the front and rear banks 4₁, 4₂Each camshaft 41₁, 41₂Lubricating part 74 of the valve train system including₁74₂Communicate with.
[0049]
Therefore, when the oil pump 57 is driven by the rotation of the crankshaft 15 via the pump drive gear 56 and the pump shaft 61, the oil in the oil reservoir 66 is sucked up from the strainer 67 and pumped to the filtration chamber 71. , After being filtered by the oil filter 70, the lubricating portion 73 of the crankshaft 15 system and each bank 4₁, 4₂Lubricating part 74 of the valve system₁74₂These can be lubricated. Moreover, the arrangement and configuration of the oil pump 57, the filtration chamber 71, the oil filter 70, and the oil supply passage 69 reduce the length of the oil supply passage 69 as much as possible, and the front and rear banks 4₁, 4₂The lubrication system with respect to the₁, 4₂Can be evenly lubricated.
[0050]
The oil filter 70 is provided with a relief valve 70b that short-circuits between the inlet chamber 71a and the outlet chamber 71b when the filter element 70a is clogged.
[0051]
On the other hand, in the water pump 62, as shown in FIG.₁The discharge pipe 76 is connected to the outlet of the radiator 29 (disposed in front of the internal combustion engine E as shown in FIG. 1).₂Through front bank 4₁Water jacket 24₁Connected to the bottom of the.
[0052]
  As mentioned above, front and rear banks 4₁ , 4₂ Each cylinder block 22₁, 22₂ And cylinder head 23₁ , 23₂ A series of water jackets 24₁, 24₂ And rear bank 4₂ Cylinder head 23₂ Has a confluence chamber 80 opening in front of it,Front and rear bank 4 ₁ , 4 ₂ In the part overhanging the valley 28The water jacket 24 is formed in the merge chamber 80.₂ The upper part of is communicated.
[0053]
Front and rear bank 4₁, 4₂The opposite water jacket 24 has a corresponding water jacket 24.₁, 24₂Lower joint 78 communicating with the lower part of₁, 78₂Projecting integrally, these joints 78₁, 78₂In addition, the lower communication water pipe 77 disposed in the valley portion 28._ThreeAre connected at both ends.
[0054]
  Front bank 4₁ On the back of the jacket 23₁ Upper joint 79 communicating with the upper part of₁ Is formed integrally with the rear bank 4₂ Cylinder head 23₂ Of the projecting part of the valley 28On the lower surface, there is an upper joint 79 communicating with the merge chamber 80.₂ These upper joints 79 are fixed with screws.₁ 79₂ Rear water pipe 77 arranged in the valley 28_Four Are connected at both ends.
[0055]
  It was formed in the part that protruded to the valley part 28 side.In the merge room 80,A thermostat 82 is installed, and a thermostat cover 81 that covers the opening of the merge chamber 80 that holds the thermostat 82 is provided in the cylinder head 23.₂ Bonded to the front of the.
[0056]
The thermostat cover 81 is integrally formed with an outlet joint 83 connected to the outlet of the thermostat 82, and the outlet joint 83 is connected to the water pipe 77._FiveIs connected to the inlet of the radiator 29 via
[0057]
The upper joint 79₂Are integrally formed with a bypass outlet joint 84 communicating with the merge chamber 80 via a communication passage 84 ′. The bypass outlet joint 84 is connected to the rear bank 4 by a bypass water pipe 85.₂The vaporizer 12₂No greenhouse, front bank 4₁The vaporizer 12₁To the heating chamber and the suction pipe 75. The bypass outlet joint 84 is formed with a sufficiently smaller diameter than the outlet joint 83 of the thermostat cover 81.
[0058]
The thermostat 82 shuts off the junction chamber 80 and the thermostat cover 81 when the water temperature in the junction chamber 80 is equal to or lower than a predetermined temperature, opens the communication path 84 ′ between the junction chamber 80 and the bypass outlet joint 84, and the water temperature is When the temperature exceeds a predetermined temperature, the junction chamber 80 and the thermostat cover 81 are communicated with each other, and the communication passage 84 'is closed.
[0059]
Therefore, when the water pump 62 is driven by the rotation of the crankshaft 15 via the pump drive gear 56 and the pump shaft 61, if the water temperature in the merging chamber 80 is relatively low, the thermostat 82 is connected to the merging chamber 80 and the thermostat. Since the cover 81 is shut off and the communication path 84 ′ is opened, the cooling water is first supplied from the discharge pipe 76 to the front bank 4 by the water pump 62.₁Water jacket 24₁Next, approximately half of the cooling water is immediately supplied to the lower communication pipe 77._ThreeThroughrear endbank4 ₂ Water jacket24 ₂ Move on. And front bank 4₁Water jacket 24₁The cooling water that has passed through the upper communication water pipe 77_FourAfter going back bank 4₂Move to the merge room 80 in the rear bank 4₂Water jacket 24₂The cooling water that has passed through the convection chamber 80, exits the bypass outlet joint 84 from the merging chamber 80 via the communication passage 84 ′, and is connected to the rear carburetor 12.₂And front vaporizer 12₁The heating chamber is sequentially returned to the suction pipe 75 of the water pump 62, and thereafter the same circulation is repeated. By such circulation of the cooling water without passing through the radiator 29, warm-up of the internal combustion engine E can be promoted, and the carburetor 12₁, 12₂Can be heated to prevent icing around the fuel nozzles.
[0060]
Both banks 4 are warming up.₁, 4₂Water jacket 24₁, 24₂When the temperature of the cooling water that has passed through the merging chamber 80 exceeds the predetermined value, the thermostat 82 communicates between the merging chamber 80 and the thermostat cover 81 and closes the communication passage 84 ′. , Flows toward the outlet joint 83 and returns to the suction pipe 75 of the water pump 62 via the radiator 29. Thereafter, since the same circulation is repeated, both banks 4 are filled with the cooling water cooled by the heat radiation action of the radiator 29.₁, 4₂Can be effectively cooled.
[0061]
By the way, the lower and upper communication pipe 77_Three, 77_FourAre relatively short, and they are located in the valley between both banks, so both banks 4₁, 4₂The appearance of the internal combustion engine E is not impaired.
[0062]
The thermostat 82 also has a front and rear bank 4.₁, 4₂The thermostat 82 is installed in the merge chamber 80 where the cooling water that has cooled the water merges.₁, 4₂Accurately sense the average water temperature of both banks 4₁, 4₂It is possible to perform proper water temperature control. In addition, piping for the thermostat 82 is not necessary, and piping can be simplified.
[0063]
Further rear bank 4₂A thermostat cover 81 having an outlet joint 83 projecting forward is joined to the upper front surface of the water pipe 77, so that the water pipe 77 communicating the outlet joint 83 with the inlet of the radiator 29._FiveIn addition, the flow resistance can be reduced and the appearance can be improved.
[0064]
Rear bank 4₂Upper joint 79₂Since the bypass outlet joint 84 having a smaller diameter and communicating with the merge chamber 80 is integrally formed, the upper joint 79₂And the rear bank 4 of the bypass outlet joint 84₂Can be installed at once, simplifying piping work.
[0065]
In addition, since the oil pump 57 and the water pump 62 are coaxially arranged and driven by the common pump shaft 61 driven from the primary drive gear 54a, the drive system can be simplified. Can do.
[0066]
In addition, since the oil pump 57 is disposed adjacent to the overrunning clutch 53 in the radial direction, an increase in the lateral width of the internal combustion engine E can be suppressed also by the coaxial arrangement of the oil pump 57 and the water pump 62.
[0067]
Further, since the oil pump 57 and the water pump 62 are disposed in front of and above the crankshaft 15, the rear portion of the crankcase 21 and the transmission case portion 95 connected thereto are completely interfered with the oil pump 57 and the water pump 62. Therefore, the ground clearance of the internal combustion engine E can be ensured and the heights of the occupant seats 6a and 6b can be easily reduced. In this case, the oil pump 57 and the water pump 62 are arranged so that the front portion of the crankcase 21 is slightly bulged.₁Therefore, the internal combustion engine E cannot be made compact.
[0068]
In addition, since the drive systems of both pumps 57 and 62 occupying the position above the crankshaft 15 are free from the immersion of the oil reservoir 66 in the oil, the drive system does not cause oil agitation and contributes to a reduction in power loss. obtain.
[0069]
Further, the input shaft 96 and the output shaft 97 of the transmission 8 are horizontally arranged immediately after the crankshaft 15 without being interfered with the oil pump 57 and the water pump 62, so that the transmission case 95 is made compact. It is also possible to form the upper wall flat, which allows the transmission case 95 and the rear exhaust pipe 13 to be formed.₂The rear exhaust pipe 13 with a sufficient distance between₂Therefore, the influence of heat on the transmission case 95 and the transmission 8 accommodated therein can be easily avoided.
[Starting system (see FIGS. 2 and 7)]
An accommodation recess 88 is formed in the front bottom surface of the crankcase 21, and the starter motor 11 is disposed there parallel to the crankshaft 15. The casing 89 of the starter motor 11 has a cylindrical support portion 89a at one end thereof fitted in a liquid-tight manner to a through hole 90 formed in the end wall of the receiving recess 88, and a mounting arm portion 89b at the other end is cranked. The case 21 is attached to the crankcase 21 by fastening with bolts 111. The rotor shaft 91 of the starter motor 11 has its tip protruding into the crankcase 21, and a pinion 92 formed at the tip of the rotor shaft 91 can drive the starter gear 52 via a reduction gear train 93. . Thus, the start gear 52, the overrunning clutch 53, and the reduction gear train 93 constitute a start transmission 94 that communicates between the start motor 11 and the crankshaft 15.
[0070]
As described above, since the starter motor 11 is disposed in front of and below the crankshaft 15, the starter motor 11 also does not hinder the compactness of the rear portion of the crankcase 21 and the transmission case portion 95, and the front portion. Bank 4₁Since it will be absorbed by the dead space below, it will not hinder downsizing of the internal combustion engine E. Further, due to the above arrangement of the starter motor 11, the reduction gear train 93 is immersed in the oil in the oil sump portion 66 at the bottom of the crankcase 21, which is activated when the engine is started. It does not act during operation and does not stir the oil, so there is no power loss.
[0071]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention.
[0072]
【The invention's effect】
  As described above, according to the first feature of the present invention, the discharge pipe of the water pump is communicated with the water jacket of the first bank, and the lower part of the water jacket of the first bank is connected to the second bank via the lower communication water pipe. The upper part of the water jacket of the first bank is connected to the lower part of the water jacket, and the upper part of the water jacket is connected to the upper part of the water jacket formed in the second bank., An upper joint attached to the lower surface of the portion of the cylinder head of the second bank that protrudes toward the valley side between the first and second banks, and is connected to the upper jointCommunicate via the upper communicating water pipe and connect the lower and upper communicating water pipes.SaidSince it arrange | positions in a trough part, the equal supply of the cooling water to a 1st and 2nd bank is attained by comparatively simple piping, and both banks can be cooled favorably. In addition, the lower and upper communicating water pipes need only be relatively short, and are disposed in the valleys between the two banks, so that they are not conspicuous and hidden between the two banks, and the appearance of the internal combustion engine is not impaired.
[0073]
  According to the second feature of the present invention,A merge chamber is formed in the protruding part of the cylinder head, and its outlet is opened and closedThe cooling water that has cooled the first and second banks joins the thermostat.the aboveBecause it is installed in the merge room, the thermostat can accurately sense the average water temperature in both banks and control the water temperature appropriately in both banks. In addition, piping for the thermostat is not necessary, and piping can be simplified.
[0074]
Further, according to the third feature of the present invention, when the internal combustion engine is mounted on a motorcycle, the first and second banks are arranged at the front and rear, and the outlet joint of the merge chamber is projected from the upper front surface of the second bank. Since this outlet joint is connected to the inlet of the radiator disposed in front of the internal combustion engine via a water pipe, the bending of the water pipe connecting the merging chamber and the radiator is reduced, and the flow resistance is reduced. , The appearance can be improved.
[0075]
Furthermore, according to the fourth feature of the present invention, an upper joint for connecting the upper communication water pipe is coupled to the second bank, and a bypass outlet joint having a smaller diameter and communicating with the merge chamber is integrally formed with the upper joint. Since the bypass water pipe connected to the water pump suction pipe is connected to this bypass outlet joint, the piping work can be simplified by integrating the upper joint and the bypass outlet joint coupled to the second bank. it can.
[0076]
Furthermore, according to the fifth feature of the present invention, since the greenhouses of the carburetors of each bank are interposed in the bypass channel, the cooling water passing through the bypass channel can prevent icing of the carburetors of both banks. it can.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle equipped with a V-type internal combustion engine of the present invention.
FIG. 2 is a side view of the internal combustion engine.
3 is a diagram of FIG.3-3 line cross section.
4 is a cross-sectional view taken along line 4-4 of FIG.
5 is a cross-sectional view taken along line 5-5 of FIG.
FIG. 6 is a cooling water system diagram of the internal combustion engine.
7 is a cross-sectional view taken along line 7-7 in FIG.
FIG. 8 is an enlarged view around the front and rear timing transmissions in FIG. 3;
FIG. 9 is an enlarged view around the transmission of FIG. 3;
FIG. 10 is a plan view around the exhaust system of the internal combustion engine.
FIG. 11 is a plan view of a cylinder head of a rear bank of the internal combustion engine.
12 is a view taken in the direction of arrow 12 in FIG. 9;
[Explanation of symbols]
E ... Internal combustion engine
M ... Motorcycle
4₁... First (front) bank
4₂... Second (rear) bank
12₁... Vaporizer in the first bank
12₂... Vaporizer in the second bank
24₁... Water jacket of the first bank
24₂... Water jacket of the second bank
28 ... Tanibe
29 ... Radiator
62 ... Water pump
75 ... Water pump suction pipe
76 ... discharge pipe of water pump
77₁, 77₂, 77_Five···Water pipe
77_Three... Lower communication pipe
77_Four... Upper communication water pipe
78₁... Lower joint of the first bank
78₂... Lower joint of second bank
79₁... Upper joint of the first bank
79₂... Upper joint of the second bank
82 ... Thermostat
83 ... Exit joint
84 ... Bypass outlet joint
85 ... Bypass water pipe

Claims (5)

In the cooling apparatus for a V-type internal combustion engine in which water jackets (24 ₁ , 24 ₂ ) are formed in the first and second banks (4 ₁ , 4 ₂ ) of the V-type internal combustion engine (E),
First bank (4 ₁₎ discharge pipe (76) communicating with, and the water jacket (24 ₁₎ lower communication water pipe at the bottom of the first bank (4 ₁₎ of the water pump (62) to the water jacket (24 ₁₎ of (77 ₃ ) communicates with the lower part of the water jacket (24 ₂ ) of the second bank (4 ₂ ), and the upper part of the water jacket (24 ₁ ) of the first bank (4 ₁ ) is connected to the second bank (4 _2). ) Formed in the merging chamber (80) connected to the upper portion of the water jacket (24 ₂ ) of the second bank (4 _2). ) Cylinder head (23 ₂ ) Of the first and second banks (4 ₁ , 4 ₂ ), the upper joint (79 ₂ ) attached to the lower surface of the portion protruding to the valley (28) side. ) And the upper joint (79 ₂₎ Communicated via the upper communicating water pipe (77 ₄₎ connected to), characterized in that the lower and upper communication water pipe (77 _3, 77 ₄₎ arranged in the valley portion (28), V-type internal combustion Engine cooling system. The cooling apparatus for a V-type internal combustion engine according to claim 1,
The merge room (80) is connected to the second bank (4 ₂ ) Cylinder head (23 ₂ Wherein formed on the overhanging portion of) to the confluence chamber (80), established the thermostat (82) for opening and closing the outlet, the chamber the outlet joint (83) of (80) to the inlet of the radiator (29) A cooling device for a V-type internal combustion engine, characterized by being in communication. The cooling device for a V-type internal combustion engine according to claim 1 or 2,
The During installation in a motorcycle (M) of the internal combustion engine (E), first and second banks (4 _1, 4 ₂₎ disposed before and after the confluence chamber to the upper front surface of the second bank (4 ₂₎ ( 80) and an outlet joint (83) projectingly connected to the inlet of a radiator (29) disposed in front of the internal combustion engine (E) through a water pipe (77 ₅ ). A cooling apparatus for a V-type internal combustion engine. The cooling device for a V-type internal combustion engine according to any one of claims 1 to 3,
The second bank (4 _2), and coupling the upper joint (79 ₂₎ connecting the upper communicating water pipe (77 _4), to the upper joint (79 _2), communicating with the merging chamber (80) from a small diameter it A bypass outlet joint (84) is integrally formed, and a bypass water pipe (85) connected to the suction pipe (75) of the water pump (62) is connected to the bypass outlet joint (84). Cooling device for internal combustion engine. The cooling apparatus for a V-type internal combustion engine according to claim 4,
A cooling apparatus for a V-type internal combustion engine, characterized in that the bypass water pipe (85) is provided with a greenhouse for the vaporizers (12 ₁ , 12 ₂ ) of each bank (4 ₁ , 4 ₂ ).

Images