JP2015116004A - Generator cooling structure of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a generator cooling structure of an internal combustion engine which discharges lubricating oil accumulated in the generator and reduces energy loss due to resistance of lubricating oil in the generator.SOLUTION: There is provided a generator cooling structure of an internal combustion engine, comprising: a generator cover for which a cylindrical support part is provided; a stator of a generator supported by the cylindrical support part; a rotor which is shaped in a cup shape and driven to rotate by driving force of an internal combustion engine. A lubricating oil introduction passage which introduces lubricating oil into the cylindrical support part is formed on an upper portion of the cylindrical support part, a lubricating oil discharge passage which is provided at a position apart from the lubricating oil introduction passage and discharges lubricating oil out of the cylindrical support part is formed in the cylindrical support part, and an opening part of the lubricating oil discharge passage is positioned on a side surface of the cylindrical support part and below an opening part of the lubricating oil introduction passage.

Description

  The present invention relates to a generator cooling structure for cooling a generator of an internal combustion engine using lubricating oil.

  The internal combustion engine includes a generator for supplying electric power necessary for charging a battery. In general, such a generator has a generator chamber formed by attaching a generator cover to the outside of a crankcase of an internal combustion engine, and is formed in a cup shape at one end of a crankshaft protruding into the generator chamber. A rotor to which a permanent magnet is attached is fixed inside the shaped portion, and a stator with a coil disposed facing the rotor is fixed to the generator cover. Such a generator generates heat when it operates, and since the generator is hermetically sealed, it is difficult to release heat from the inside. Therefore, a cooling method is adopted in which lubricating oil is introduced into the generator and the generator is cooled by the lubricating oil.

  For example, Patent Document 1 discloses a generator cooling structure using lubricating oil. In this generator cooling structure, the stator is supported by the central cylindrical portion of the generator cover, and notches and openings are formed in the upper portion of the central cylindrical portion, and oil that guides lubricating oil to these notches and openings in the generator cover. A guide part is formed, and an injection hole for injecting lubricating oil toward the stator is formed in the generator cover. Lubricating oil that adheres to the generator cover and flows down is formed in the central cylindrical part through a notch and an opening. The generator is cooled by directing to the generator or by directly injecting the lubricating oil ejected from the injection port onto the generator.

  In such a generator cooling structure, a large amount of lubricating oil is introduced into the generator to improve the cooling effect, but the lubricating oil accumulated in the generator is difficult to be discharged outside the generator, and the resistance of the generator due to the large amount of lubricating oil resistance Energy loss during power generation was increasing.

Japanese Patent No. 4647420

  The present invention has been made in view of such a technical problem, and an object of the present invention is to introduce lubricating oil into the generator with a simple configuration to improve the cooling effect and to collect the lubricating oil accumulated in the generator more than a predetermined amount. By discharging the oil, the energy loss due to the resistance of the lubricating oil during power generation by the generator is reduced.

  The present invention solves the above-mentioned problems, and the invention according to claim 1 is formed in a concave shape and is fixed to the outside of the crankcase to form a generator chamber in the concave shape. A generator cover provided with a cylindrical support portion projecting toward the direction, a generator stator supported by the cylindrical support portion, a cup-like shape, and disposed so as to face the stator. In a generator cooling structure of an internal combustion engine provided with a rotor that is rotationally driven by a driving force of the engine, an upper portion of the cylindrical support portion communicates the inside and the outside of the cylindrical support portion, and the cylindrical support portion A lubricating oil introduction oil passage for introducing lubricating oil is formed inside, and the cylindrical support portion communicates with the inside and the outside of the cylindrical support portion at a position separated from the lubricating oil introduction oil passage. Provided, cylindrical A lubricating oil discharge oil passage for discharging lubricating oil from the inside of the holding portion is formed, and the opening of the lubricating oil discharge oil passage is a side surface of the cylindrical support portion, and the opening of the lubricating oil introduction oil passage It is a generator cooling structure of an internal combustion engine characterized by being located below.

  According to a second aspect of the present invention, in the generator cooling structure for an internal combustion engine according to the first aspect, the generator cover includes an accessory storage portion that is enlarged above the opening of the lubricating oil introduction oil passage, The lubricating oil introduced into the cylindrical support portion is guided from an accessory storage space including the accessory storage portion and the crankcase.

  According to a third aspect of the present invention, in the generator cooling structure for an internal combustion engine according to the second aspect, in the auxiliary equipment storage space, a starter motor for starting the internal combustion engine, and the power of the starter motor are cranked. A power transmission reduction gear that is transmitted to the shaft is provided, and the lubricating oil guided to the inside of the cylindrical support portion uses the lubricating oil scattered from the starter motor and the power transmission reduction gear. It is.

  According to a fourth aspect of the present invention, in the generator cooling structure for an internal combustion engine according to the third aspect, in the auxiliary equipment storage space, the lubricating oil scattered in the auxiliary equipment storage space is supplied to the lubricating oil introduction oil passage. A guide plate leading to the opening is provided, and a lower end portion of the guide plate is disposed near the upper portion of the opening.

  According to a fifth aspect of the present invention, in the generator cooling structure for an internal combustion engine according to the fourth aspect, the guide plate covers a wiring extending from the stator to a grommet located in an upper part of the accessory housing space. It is a cover member, It is formed so that it may incline toward the opening part of the said lubricating oil introduction oil path from the attaching part of the said guide plate.

  According to the generator cooling structure for an internal combustion engine according to claim 1, the lubricating oil for introducing the lubricating oil into the cylindrical support portion by communicating the inside and the outside of the cylindrical support portion with the upper portion of the cylindrical support portion. Lubricating oil discharge is formed with an introduction oil passage, and the cylindrical support portion discharges the lubricating oil through communication between the inside and outside of the cylindrical support portion provided at a position separated from the lubricating oil introduction oil passage. An oil passage is formed, and the opening portion of the lubricating oil discharge oil passage is a side surface of the cylindrical support portion and is located below the opening portion of the lubricating oil introduction oil passage. When the amount of lubricating oil passing through the lubricating oil introduction oil passage and flowing into the generator via the inside of the cylindrical support portion exceeds a predetermined value, it was formed at a position lower than the opening of the lubricating oil introduction oil passage. The lubricating oil is discharged from the generator through the opening of the lubricating oil discharge oil passage. Therefore, with a simple structure, the lubricating oil is guided inside the generator to ensure the cooling performance of the generator, and the lubricating oil accumulated in the generator is discharged more than a predetermined amount. It is possible to reduce the friction loss and reduce the energy loss of the driving device.

  According to the generator cooling structure for an internal combustion engine according to claim 2, the generator cover includes the accessory storage space that is enlarged toward the upper side of the opening of the lubricating oil introduction oil passage. Since it is possible to collect a larger amount of lubricating oil by collecting scattered and accumulated lubricating oil, it becomes possible to introduce a large amount of lubricating oil into the generator, and multiple lubricants are introduced to guide the lubricating oil for cooling. There is no need to provide a lubricating oil passage, and the manufacturing cost can be reduced. Even if a large amount of lubricating oil is introduced into the generator, the excess lubricating oil can be discharged, while maintaining the optimum amount of lubricating oil for cooling the oil and further reducing the energy loss of the internal combustion engine. It can cool more efficiently.

  According to the generator cooling structure for an internal combustion engine according to claim 3, a starter motor for starting the internal combustion engine and a power transmission reduction gear for transmitting the power of the starter motor to the crankshaft are arranged in the accessory storage space. Therefore, the lubricating oil that is supplied to and discharged from the starter motor and the power transmission reduction gear and scattered in the enlarged space of the generator cover can be efficiently guided from the cylindrical support portion to the inside of the generator to efficiently cool the generator. it can. Further, during the operation of the internal combustion engine, it is possible to prevent scattering of the lubricating oil by the gears of the starting system and to introduce a larger amount of lubricating oil into the generator.

  According to the generator cooling structure for an internal combustion engine according to claim 4, a guide plate is provided in the accessory storage space to guide the scattered lubricating oil to the introduction opening, and the lower end of the guide plate is cylindrically supported. Since it is arranged so as to be located in the vicinity of the upper part of the inlet opening of the part, the lubricating oil scattered in the auxiliary equipment storage space is efficiently collected, and is surely transferred to the inlet opening of the cylindrical support part through the guide plate. Therefore, it is possible to further increase the effect of cooling the generator by sending a large amount of lubricating oil into the generator.

  According to the generator cooling structure for an internal combustion engine according to claim 5, the guide plate uses a cover member that covers the wiring extending from the stator to the grommet located in the upper part of the accessory storage space. Since it is arranged to be inclined from the mounting part toward the opening of the lubricating oil introduction oil passage, it is not necessary to increase the number of parts and prevent an increase in manufacturing cost, while efficiently guiding the lubricating oil into the generator and providing a cooling effect. Can be improved.

1 is a left side view of an entire saddle type motorcycle equipped with an internal combustion engine having a generator cooling structure according to an embodiment of the present invention. It is a left view of the internal combustion engine provided with the generator cooling structure of this invention. It is the schematic of the left side surface of an internal combustion engine. FIG. 4 is a developed sectional view taken along the line IV-IV in FIG. 3. FIG. 5 is a developed sectional view taken along the line V-V in FIG. 3. FIG. 4 is a developed sectional view taken along the line VI-VI in FIG. 3. FIG. 7 is a developed sectional view taken along the line VII-VII in FIG. 3. It is the right view seen from the crankshaft side of a generator cover. It is an IX arrow principal part enlarged view of FIG. FIG. 9 is an enlarged view of an essential part of the arrow X in FIG. 8. It is the figure which mounted the induction | guidance | derivation board on the generator cover. It is the figure which attached the induction plate and the stator of the generator to the generator cover. It is a top view of a guide plate. It is a XIV arrow line view of FIG. FIG. 15 is an XV-XV sectional view of FIG. 14. It is the principal part enlarged view which attached the stator to the cylindrical support part of the generator cover.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is an overall side view of a saddle riding type motorcycle 1 according to an embodiment to which the present invention is applied, and FIG. 2 is a left side view showing only a state in which an internal combustion engine 20 is mounted on a body frame 2. . In the description and claims of the present specification, the front-rear and left-right directions are based on a normal standard in which the straight traveling direction of the saddle riding type motorcycle 1 according to the present embodiment is the front.

  As shown in FIGS. 1 and 2, the vehicle body frame 2 of the saddle riding type motorcycle 1 is extended from the head pipe 3 with the main frame 4 extending slightly in the vehicle width direction rearward with a slight inclination. The main frame 4 is bent downward to form the main steeply inclined portion 4a, and the down frame 5 extends from the head pipe 3 with the center in the vehicle width direction obliquely rearward and downward.

  The front portion of the crankcase 22 in the internal combustion engine 20 is attached to the support bracket 5b at the lower portion of the down frame 5 by two bolts 8 at the top and bottom, and the rear portion of the crankcase 22 is connected to the main steeply inclined portion 4a of the main frame 4. The internal combustion engine 20 is supported by the vehicle body frame 2 by being attached to the lower support bracket 4b by bolts 9 at two locations, upper and lower.

  A pair of left and right seat rails 6 extends rearward from the bent portion of the main frame 4 while forming a bent portion in the middle, and the back connecting the bent portion of the seat rail 6 and the central portion of the main steeply inclined portion 4a. A stay 7 supports the seat rail 6.

  In the body frame 2 as described above, the front fork 10 is pivotally supported on the head pipe 3, the front wheel 11 is pivotally supported at the lower end thereof, the steering handle 12 is provided at the upper end of the pivot of the front fork 10, and the main frame 4 A rear fork 14 pivotally supported at the front end of a pivot shaft 13 provided at the lower part of the rear shaft extends rearwardly, and a rear wheel 15 is pivotally supported at the rear end thereof, between the center portion of the rear fork 14 and the backstay 7. A rear cushion 16 is interposed. A fuel tank 17 is installed on the main frame 4 so as to straddle the left and right sides, and a seat 18 is supported by the seat rail 6 behind the fuel tank 17.

  The internal combustion engine 20 mounted on the vehicle body frame 2 is an SOHC type single-cylinder four-stroke internal combustion engine. The crankshaft 31 is directed in the vehicle body width direction with respect to the vehicle body, and the cylinder is tilted slightly forward to stand upright. Suspended.

  A front cover 19f covers the upper part of the down frame 5 of the body frame 2 from the left and right sides, a side cover 19s covers the left and right sides between the internal combustion engine 20 and the seat 18, and a rear cover 19r covers the second half of the seat rail 6. .

  As shown in FIG. 2, the engine body 21 of the internal combustion engine 20 includes a cylinder block 24 and a cylinder head 25 which are sequentially stacked on a diagonally upper side of a left and right crankcase 22 and fastened together by a stud bolt 37. A cylinder head cover 26 is covered on the cylinder 25, and the cylinder block 24, the cylinder head 25, and the cylinder head cover 26 protrude from the crankcase 22 so as to be inclined forward slightly.

  As shown in FIGS. 4 and 5, the crankshaft 31, the main shaft 33, the counter shaft 34, and the balancer shaft 48 oriented in the left-right direction are divided by the right crankcase 22a and the left crankcase 22b of the left-right split crankcase 22. It is pivotally supported. The outer sides of the left and right crankcases 22 are respectively covered with a right case cover 55 and a left case cover 56 and fastened together with bolts 85.

  In the cylinder block 24 projecting obliquely upward from the crankcase 22, a cylinder sleeve 27 into which a piston 28 is slidably fitted projects into the crank chamber 22c of the crankcase 22. A connecting rod 32 connects a piston 28 reciprocating in the cylinder sleeve 27 and a crank pin 31p installed between the crank webs 31w and 31w of the crankshaft 31, and the crankshaft 31 is driven to rotate according to the movement of the piston 28. .

  A combustion chamber 29 is formed below the cylinder head 25 and above the piston 28. A spark plug 30 is provided in the combustion chamber 29 through the wall surface of the cylinder head 24. An intake / exhaust port (not shown) is formed in the combustion chamber 29, and a valve mechanism 40 for driving an intake / exhaust valve (not shown) that opens and closes the intake / exhaust port opening of the combustion chamber 29 is provided in the cylinder head 25. ing. A cam shaft 41 is rotatably supported above the combustion chamber 29 of the cylinder head 25, and a driven sprocket 42 is attached to the left end portion of the cam shaft 41. A cam chain chamber 46 is formed on the left side of the internal combustion engine 20. A cam chain 44 is stretched over the drive sprocket 43 and the driven sprocket 42 which are integrally fixed to the crankshaft 31, and the power of the crankshaft 31 is transmitted to the camshaft 41 via the cam chain 44. With the rotation of 41, the cam surface 41b of the cam 41a formed on the cam shaft 41 causes the rocker arms 45 for suction and exhaust to be oscillated, and the shaft end abuts against the sliding surface of the rocker arm 45. The exhaust valve is opened and closed at a predetermined timing.

  A gear transmission mechanism 35 is provided behind the crankshaft 31. The gear transmission mechanism 35 has a predetermined gear ratio by using a gear shift mechanism (not shown) for meshing a plurality of gears provided on the main shaft 33 and the counter shaft 34 in order to transmit a predetermined torque to the rear wheel 15. It is to be changed as follows. A rotational driving force of the crankshaft 31 is transmitted to the main shaft 33 via the clutch 36, and is shifted by the gear transmission mechanism 35 to be transmitted from the main shaft 33 to the counter shaft 34. The sprocket 37 is integrally fastened to the counter shaft 34. The power is transmitted to the rear wheel 15 by the power transmission belt 38 that spans the rear wheel 15.

  As shown in FIGS. 3 and 5, a balancer mechanism 47 is provided in front of the crankshaft 31. The balancer mechanism 47 has a balance weight 49 fixed to both ends of a balancer shaft 48 supported by the crankcase 22, the balancer shaft 48 is rotated by the power transmitted from the crankshaft 31, and the rotation of the balance weight 49 causes the internal combustion engine 20 to rotate. The vibration caused by the piston 28 is canceled out. The balance weight 49 disposed on the left side is accommodated in a balance weight space 58 formed in front of the left crankcase 22b.

  A starter motor 60 that rotates the crankshaft 31 by receiving power supply from a battery (not shown) when the internal combustion engine 20 is started is disposed above and behind the crankshaft 31.

  As shown in FIGS. 3 and 6, the oil pump 50 is disposed below the crankshaft 31. The oil pump 50 is fastened to the right side surface of the right crankcase 22a by a bolt (not shown), and the rotational driving force of the crankshaft 31 is transmitted to the oil pump shaft 51 via the gear 52 so that the oil pump 50 is driven. It has become. Below the crankcase 22, an oil pan 53 is configured by combining the right crankcase 22a and the left crankcase 22b. In the right crankcase 22a, a supply oil passage 54 for supplying lubricating oil to the oil pump 50 from the oil pan 53 upward is formed. Between the oil pump 50 and the supply oil passage 54, an oil strainer 55 is held by a right crankcase 22a and a right case cover 23a. Lubricating oil stored in the oil pan 53 is pumped from the supply oil passage 54 by the oil pump 50, and lubricating oil is formed in the supply oil passage 56 and the right crankcase 22a formed in the right case cover 23a. Passing through the supply oil passage 57, it is sent to the important points of the internal combustion engine 20 such as the crankshaft 31 and the valve mechanism 40 for the purpose of lubrication and cooling, and the lubricating oil sent to the important points is scattered in the internal combustion engine 20. Then, it travels through various places in the internal combustion engine 20 and returns to the oil pan 53 and is again pumped by the oil pump 50 to each place.

  As shown in FIG. 4, a generator 81 that is located on the left side of the internal combustion engine 20 and supplies power to a battery (not shown) of the internal combustion engine 20 is disposed in the generator chamber 80. ing. The generator chamber 80 includes a left crankcase 22b and a left case cover 23b that abuts on the outside of the left crankcase 22b and serves as a generator cover 90 and is integrally fixed by fastening bolts 85. ing. The generator 81 includes a rotor 82 attached to the left end 31a of the crankshaft 31 protruding into the generator chamber 80 from the crank chamber 22c, and a stator 83 attached to the generator cover 90 so as to face the rotor 82.

  FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 3, and is an enlarged view of the vicinity of the generator chamber 80 and the generator 81. During operation of the internal combustion engine 20, the power of the crankshaft 31 is transmitted from the flywheel 67 to the rotor 82, and during start-up, the power from the starter motor 60 is transmitted to the starter reduction gear 61, starter driven gear 63, one-way clutch 65, clutch housing. 66 and the flywheel 67 are transmitted to the crankshaft 31.

  As shown in FIG. 3, a starter motor 60 is disposed at the upper rear side of the left crankcase 22b. A starter reduction gear 61 and a starter driven gear 63 are disposed at the lower front side of the starter motor 60. As shown in FIG. 7, a starter reduction gear 61 is formed by adjoining a large-diameter gear 61a and a small-diameter gear 61b to reduce the rotational speed of the starter motor 60, and the output of the output shaft 60a of the starter motor 60 is reduced. The gear 60b and the large-diameter gear 61a of the starter reduction gear 61 are engaged with each other. When the generator cover 90 is attached to the left crankcase 22b, the reduction gear shaft 62 that supports the starter reduction gear 61 is formed on the reduction gear shaft support boss 22d formed on the left crankcase 22b and the generator cover 90. The reduction gear shaft support boss 92b is rotatably supported. The starter driven gear 63 includes a gear portion 63a that meshes with the small-diameter gear 61b of the starter reduction gear 61, and a boss portion 63b that is supported by the crankshaft. It is supported.

  The rotor 82 of the generator 81 is formed in a cup shape having a bottom portion 82a and a cylindrical peripheral wall portion 82b formed around the bottom portion 82a, and a permanent magnet 82c is attached to the inner peripheral surface of the cylindrical peripheral wall portion 82b. ing.

  The flywheel 67 adjacent to the rotor 82 includes a boss portion 67a and a gear portion 67b. The gear portion 67b is integrally fixed by a bottom portion 82a of the rotor 82 and a caulking 69. A gear portion 67 b of the flywheel 67 is fastened to the clutch housing 66 by a bolt 70. The integrated rotor 82, flywheel 67 and clutch housing 66 are inserted into the crankshaft 31, and the clutch housing 66 fixed integrally with the flywheel 67 is connected to the boss of the starter driven gear 63 via the one-way clutch 65. It is supported by the part 63b. The boss portion 67a of the flywheel 67 is positioned by a key 68, and the flywheel 77 is attached to the crankshaft 31 by spline fitting, and is fastened to the crankshaft 31 by a washer 71 and a nut 72.

  As shown in FIGS. 7 and 12, the stator 83 disposed so as to face the inner side of the rotor 82 has a mounting plate 83a formed in a donut shape, and extends radially from the circumference of the mounting plate 83a. A plurality of bobbin portions 83c and a coil portion 83d wound around the bobbin portion 83c are provided. Both ends of the coil wire of the coil part 83d are connected to the stator wiring 100 and connected to a battery (not shown). Three plug insertion holes 83b are formed in the mounting plate 83 at equal intervals.

  As shown in FIGS. 7 and 12, a pulsar 75 for detecting the rotation timing of the crankshaft 31 is disposed in the generator chamber 80. An element 82d to be detected is attached to the outer peripheral surface of the cylindrical peripheral wall portion 82b of the rotor 82 of the generator 81 at a predetermined interval. The detection unit 75a of the pulsar 75 is fixed inside a generator cover 90, which will be described later, so as to face the detected element 82d when the rotor 82 rotates and the detected element 82d is positioned at a predetermined position. In the pulsar 75, the crankshaft 31 rotates and the detection unit 75a detects the proximity of the detected element 82d to detect the rotation timing of the crankshaft 31. The signal detected by the pulsar 75 is sent to the internal combustion engine control device (not shown) through the pulsar wiring 100.

  As shown in FIGS. 2, 5, 7, and 8, the generator cover 90 that is attached to the outer end surface of the left crankcase 22b and forms the generator chamber 80 with the left crankcase 22b is formed in a concave shape. Yes. The generator cover 90 is formed in a cup shape, and has a bowl-shaped portion 91 for housing the generator 81 therein, an auxiliary machine storage portion 92 for projecting from the bowl-shaped portion 91 toward the rear and upward, and housing an auxiliary machine, and a balancer. A balancer weight cover portion 93 projecting forward from the hook-shaped portion 91 so as to cover the left side of the balancer weight space 58 formed in the left crankcase 22b so as to store the weight 49, and a predetermined height on the outer periphery thereof. The outer wall portion 94 is formed so that the end surface thereof is in contact with the end surface of the left crankcase 22b.

As shown in FIGS. 7 and 8, a cylindrical support portion 95 that supports the stator 83 of the generator 81 is formed at the center of the bottom surface 91 a of the bowl-shaped portion 91. The cylindrical support portion 95 is formed in a cylindrical shape and protrudes toward the inner crankcase 22 side. The cylindrical support portion 95 protrudes from the wall surface of the cylindrical portion 95a at substantially three intervals in the circumferential direction and has screw holes 95c. A boss portion 95b is formed. The cylindrical end face 95a ₁ of the 95a, the convex portion 95a ₂ projecting into the crankcase 22 direction with a predetermined width from the inner circumferential surface of the cylindrical portion 95a is formed. As shown in FIGS. 4, 12, and 16, the perforated bolt 86 inserted through the perforated bolt insertion hole 83 b of the mounting plate 83 a of the stator 82 is fastened to the screw hole 95 c of the cylindrical support portion 95. Accordingly, the stator 83 is fixed to the cylindrical support portion 95.

As shown in FIG. 8, the upper portion of the cylindrical portion 95a, open toward the auxiliary housing portion 92, notched introducer notch 95d from the end face 95a ₁ of the cylindrical portion 95a is formed (FIG. 9 reference). As shown in FIG. 16, when the stator 82 is attached to the generator cover 90, the introduction notch portion 95d allows the inside and outside of the cylindrical portion 95a to communicate with each other, and lubricant is supplied from the outside of the cylindrical portion 95a to the cylindrical portion 95a. A lubricating oil introduction oil passage 95f to be introduced into the inside is formed. As shown in FIG. 8, the opening 95 f ₁ of the lubricating oil introduction oil passage 95 f opens toward the auxiliary machine storage part 92, and the cylindrical oil 95 adheres and flows down to the auxiliary machine storage part 92. Is introduced into the generator 81 from the inside.

The front side of the further cylindrical portion 95a, at a position spaced from the inlet notch 95d, the discharge cutout portion 95e is formed which is cut from the end face 95a ₁ of the cylindrical portion 95a. The discharge notch 95e is located below the introduction notch 95d. When the stator 82 is attached to the generator cover 90, the discharge notch 95e communicates between the inside and the outside of the cylindrical portion 95a and discharges the lubricating oil from the inside of the cylindrical portion 95a to the outside. Become. As shown in FIG. 8, the opening 95g ₁ of the lubricant discharge oil passage 95g is opened to the front side surface of the cylindrical portion 95a, when the lubricating oil flowing into the generator 81 becomes a large amount, lubrication Oil can be discharged from the oil discharge passage 95g.

On the bottom surface 91a of the bowl-shaped portion 91, a plurality of radial ribs 91b are formed radially at a predetermined height from the cylindrical support portion 95 disposed in the center toward the outer wall portion 94 of the bowl-shaped portion 91. ing. Among the radial ribs 91b, the lubricating oil guiding rib 91c in which one end of the rib is joined in the vicinity of the connecting portion 94a where the flange-like portion 91 and the accessory housing portion 92 are connected in the outer wall portion 94 has a cylindrical end. Jo portion is formed so as to introduce extends rearwardly of the opening 95d ₁ of the notch 95d of the 95a, the lubricating oil that has flowed down to the bowl-shaped portion from the auxiliary storage unit 92, the opening of the lubricating oil introducing oil path 95f and so that it can lead to parts 95f _1.

The generator cover 90, auxiliary storage unit 92 for storing the accessory, such as a starter motor 60 and the starter reduction gear 61 is formed with, upward from the bowl-shaped portion 91 from the opening portion 95f ₁ of the lubricating oil introducing oil path 95f The shape is enlarged. The auxiliary equipment storage portion 92 has a bottom portion 92a and a reduction gear shaft that projects from the bottom portion 92a to the inner crankshaft 31 side and supports the reduction gear shaft 62 of the starter reduction gear 61 with the reduction gear support boss 22d of the right crankcase 22b. A gear shaft support boss 92b is formed.

  Further, the auxiliary equipment storage portion 92 projects inwardly from the bottom portion 92a, and a pair of pulsar mounting bosses 92c to which the pulsar 75 is attached, and a guide plate 98 for guiding the lubricating oil scattered in the auxiliary equipment storage space 88. Is provided with a guide plate mounting boss 92d. The pulsar mounting boss 92c and the guide plate mounting boss 92d are formed lower than the height of the reduction gear shaft support boss 92b.

  In addition, ribs 92e and 92g for supporting the guide plate 98 and a convex portion 92f for positioning the guide plate 98 are formed on the bottom 92a of the accessory storage portion 92. A pair of guide ribs 91 d for guiding the guide plate 98 is formed from the bottom 91 a of the bowl-shaped portion 91 to the bottom 92 a of the accessory storage portion 92.

  A grommet mounting notch 94a in which a grommet 102 through which the pulsar wiring 100 and the stator wiring 101 are inserted is fitted in the outer wall portion 94 located behind the auxiliary machine housing portion 92 is shaped as shown in FIG. Is formed. Stator wiring 100 and pulsar wiring 101 pass through grommet 102 and are connected to a battery (not shown) that stores the power generated by generator 81, an internal combustion engine control device (not shown), and the like.

  As shown in FIGS. 12 to 15, the guide plate 98 includes a mounting portion 98a, a diagonally upward extending portion 98b that extends diagonally rearward and upward from the mounting portion 98a so as to bypass the reduction gear shaft support boss 92d, A diagonally downward extending portion 98c extending diagonally forward and downward from the attachment portion 98a and a peripheral wall portion 98e formed at a predetermined height so as to surround the periphery are provided.

  The obliquely upward extending portion 98b extends in the same plane as the attachment portion 98a and covers the pulsar wiring 101. The guide plate 98 is positioned by the convex portion 92f of the auxiliary device storage portion 92 and the guide plate guide rib 91d, is supported by the ribs 92e and 92g formed in the auxiliary device storage portion 92, and is inserted into the bolt insertion hole 98f of the mounting portion 98. The perforated bolt 99 is screwed onto the guide plate mounting boss 92d of the auxiliary machine storage unit 92 to be attached to the auxiliary machine storage unit 92.

As shown in FIG. 5, the obliquely downward extending portion 98 c avoids the rotor 82 of the generator 81 from the attachment portion 98 a, and forms the opening 95 f ₁ of the lubricating oil introduction oil passage 95 f of the cylindrical portion 95 a of the cylindrical support portion 95. As viewed from the rear, the lower end portion 98d extends toward the lower side of the generator cover 90 from the crankcase 22 side so that the lower end portion 98d faces the upper portion. Furthermore, as shown in FIG. 12, in right side view, the lower end portion 98d of the obliquely downward extending portion 98c is to extend to the outer peripheral surface of the stator 83 obliquely downward toward the opening 95f ₁ of the lubricating introduction oil passage 95f The guide plate 98 covers the stator wiring 100 extending from the stator 83.

According to the embodiment of the present invention, the upper portion of the cylindrical support portion 95 of the generator cover 90 is connected to the inside and the outside of the cylindrical support portion 95 to introduce lubricating oil into the cylindrical support portion 95. An oil introduction oil passage 95f is formed, and the cylindrical support portion 95 communicates the inside and the outside of the cylindrical support portion 95 provided at a position separated from the lubricating oil introduction oil passage 95f. the lubricant discharge oil passage 95g for discharging are formed, the opening 95g ₁ of the lubricant discharge oil passage 95g is a side of the cylindrical support portion 95, below the opening 95f ₁ of the lubricating oil introducing oil path 95f Therefore, a large amount of lubricating oil scattered in the generator chamber 80 is guided by the lubricating oil guiding rib 91c, and passes through the inside of the cylindrical support portion 95 from the lubricating oil introducing oil passage 95f to the inside of the generator 81. When the amount of lubricating oil in the generator 81 exceeds a predetermined level, the lubricating oil introduction oil passage 95f It can be discharged lubricating oil from inside the generator 81 via the mouth portion 95f opening 95g ₁ of the lubricant discharge oil passage 95g formed in a position lower than ₁ leads to the lubricating oil inside the generator 81 with a simple structure While ensuring the cooling performance of the generator 81, the lubricating oil accumulated inside the generator 81 is discharged to reduce the friction loss due to the resistance of the lubricating oil during power generation of the generator 81, and the energy loss of the internal combustion engine 20 is reduced. Can be made.

Further, the generator cover is provided with auxiliary housing space 88 is enlarged upwardly opening portion 95f ₁ of the lubricating oil introducing oil path 95f. As shown in FIG. 3, during normal operation of the internal combustion engine, the crankshaft 31 rotates counterclockwise as viewed from the left side, and the lubricant stored in the lower part of the internal combustion engine 20 contains the starter driven gear 61. For example, it is scattered toward the auxiliary equipment storage space 88. Further, in the auxiliary machine storage space 88, lubricating oil discharged from auxiliary machines such as the starter motor 60, the starter reduction gear 61, the starter driven gear 63 and the like is scattered. Since the lubricating oil scattered and staying in the expanded space can be collected and a larger amount of lubricating oil can be collected, it becomes possible to guide a large amount of lubricating oil into the generator 81 and to cool it. Therefore, it is not necessary to provide a plurality of lubricating oil passages for guiding the lubricating oil for use, and the manufacturing cost can be reduced. Even if a large amount of lubricating oil is introduced into the generator 81, excess lubricating oil can be discharged, while maintaining the optimum amount of lubricating oil for oil cooling, while further reducing the energy loss of the internal combustion engine 20, The generator can be cooled more efficiently.

The auxiliary equipment storage space 88 is provided with a guide plate 98 for guiding the scattered lubricating oil, and a lower end portion 98d of the guide plate 98 is an opening of the lubricating oil introduction oil passage 95f of the cylindrical support portion 95. because it is arranged so as to be positioned above and near parts 95f _1, the lubricating oil scattered in the auxiliary housing space 88 efficiently collected along the guide plate 98, the lubricating oil introducing oil passage of the cylindrical support portion 95 it is possible to reliably guided to the opening 95f ₁ of 95f, feeding a large amount of lubricating oil inside the generator 81, the generator 81 can further increase the effect of cooling the.

The guide plate 98 uses a cover member that covers the stator wiring 100 that extends from the stator 83 to the grommet 102 located in the upper part of the accessory storage space 88, and introduces lubricating oil from the mounting portion 98a of the guide plate 98. since toward the opening 95f ₁ of the oil passage 95f are arranged to be inclined, while preventing an increase in manufacturing cost without need to increase the number of parts, improve the cooling effect leads efficiently lubricating oil in the generator 81 be able to.

  In the embodiment, the lubricating oil introduction oil passage and the lubricating discharge oil passage are provided by providing the introduction notch portion 95d and the discharge notch portion 95e in the cylindrical portion of the cylindrical support portion 95. The lubricating oil introduction oil passage may be formed by drilling, and the lubricating oil discharge oil passage may be formed by drilling the front side surface of the cylindrical portion.

DESCRIPTION OF SYMBOLS 1 ... Saddle type motorcycle, 20 ... Internal combustion engine, 22 ... Crankcase, 23 ... Case cover, 31 ... Crankshaft, 33 ... Cylinder block, 34 ... Cylinder head, 35 ... Cylinder head cover, 50 ... Oil pump, 60 ... Starter motor, 61 ... Starter reduction gear, 62 ... Reduction gear shaft, 63 ... Starter driven gear, 80 ... Generator chamber, 81 ... Generator, 82 ... Rotor, 83 ... Stator, 88 ... Auxiliary equipment storage space, 90 ... Generator cover, 91 ... bowl-shaped part, 91a ... bottom part, 91b ... radial rib, 91c ... lubricating oil guide rib, 91d ... guide plate guide rib, 92 ... auxiliary equipment storage part, 92a ... bottom part 92, 92b ... reduction gear shaft support boss, 92c ... Pulsar mounting boss, 92d ... induction mounting boss, 92f ... convex, 93 ... balancer weight cover, 94 ... outer wall, 95 ... cylindrical support, 95a ... cylindrical, 95d ... introduction notch, 95e ... discharge notch , 95f ... Introduction of lubricating oil Road, 95f 1 _... opening, 95 g ... lubricant discharge oil passage, 95 g 1 _... opening, 98 ... guide plate, 98d ... tip 100 ... wiring stator, 101 ... pulsar wire, 102 ... grommet.

Claims (5)

Formed in a concave shape, fixed to the outside of the crankcase (22) to form the generator chamber (80) inside the concave shape, and provided with a cylindrical support portion (95) projecting inward from the concave inner wall Generator cover (90),
A stator (83) of a generator (81) supported by the cylindrical support (95);
In the generator cooling structure of the internal combustion engine, which is formed in a cup shape, is disposed so as to face the stator (83), and includes a rotor (82) that is rotationally driven by the driving force of the internal combustion engine (20).
The upper part of the cylindrical support part (95) communicates the inside and the outside of the cylindrical support part (95), and introduces the lubricating oil into the cylindrical support part (95). A road (95f) is formed,
The cylindrical support portion (95) communicates the inside and the outside of the cylindrical support portion (95) and is provided at a position separated from the lubricating oil introduction oil passage (95f), and the cylindrical support portion A lubricating oil discharge oil passage (95 g) for discharging lubricating oil from the inside of (95) is formed,
The opening (95g ₁ ) of the lubricating oil discharge oil passage (95g) is a side surface of the cylindrical support portion (95) and is more than the opening (95f ₁ ) of the lubricating oil introduction oil passage (95f). A generator cooling structure for an internal combustion engine, which is located below. The generator cover (90) includes an accessory storage portion (92) that is enlarged above the opening (95f ₁ ) of the lubricating oil introduction oil passage (95f),
Lubricating oil introduced into the cylindrical support portion (95) is guided from an accessory storage space (88) formed by the accessory storage portion (92) and the crankcase (22). The generator cooling structure for an internal combustion engine according to claim 1. In the accessory storage space (88), a starter motor (60) for starting the internal combustion engine (20), and a power transmission gear for transmitting the power of the starter motor (60) to the crankshaft (31) ( 61) is arranged,
The lubricating oil guided from the starter motor (60) and the power transmission gear (61) is used as the lubricating oil introduced into the cylindrical support portion (65). Generator cooling structure for internal combustion engines. In the accessory storage space (88), there is a guide plate (98) that guides the lubricating oil scattered in the accessory storage space (88) to the opening (95f ₁ ) of the lubricating oil introduction oil passage (95f). Provided,
The generator cooling structure for an internal combustion engine according to claim 3, wherein a lower end portion (98d) of the guide plate (98) is disposed so as to be located near the upper portion of the opening (95f ₁ ). The guide plate (98) is a cover member (98) that covers the wiring (100) extending from the stator (83) to the grommet (102) located in the upper part of the accessory storage space (88). ,
Wherein the mounting portion of the guide plate (98) (98a), in claim 4, characterized in that it is formed to be inclined toward the opening of the lubricating oil introducing oil passage _(95f) (95f 1) Generator cooling structure for internal combustion engines.

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