JP6899858B2 - Internal combustion engine - Google Patents

Description

The present invention relates to an internal combustion engine having a structure for discharging oil in a one-way clutch adjacent to a generator.

A conventional internal combustion engine has a generator in which a permanent magnet is arranged inside a rotor in order to supply electric power necessary for charging a battery, etc., and power from a starter motor is supplied adjacent to this generator. A gear to be transmitted is provided. The power of this gear is transmitted to the crankshaft via the rotor, and the one-way clutch sandwiched between the gear and the rotor in the radial direction transfers the power from the gear rotationally driven by the starter motor to the rotor in only one direction. Some have a structure that is transmitted.

In such an internal combustion engine, oil or the like splashed inside the internal combustion engine is supplied between the surfaces where the crankshaft and the gear are in sliding contact or between the surfaces where the gear and the rotor are in sliding contact to reduce friction. .. The oil supplied between these sliding contact surfaces and the dust mixed in the oil flow into the one-way clutch due to the centrifugal force accompanying the rotation of the rotor. However, the conventional internal combustion engine does not have a passage for discharging oil and dust to the outside of the one-way clutch, and the problem is that the oil and dust accumulated in the one-way clutch cannot be discharged to the outside. There is. Furthermore, it is more necessary to cool the permanent magnet that generates heat due to the power generated by the generator.

Japanese Patent No. 3739522

The present invention has been made in view of such technical problems, and an object of the present invention is to discharge oil and dust accumulated in a one-way clutch with a simple configuration, and to use the discharged oil to discharge a permanent magnet of a generator. Is to improve the cooling of the.

The present invention solves the above-mentioned problems, and is arranged so as to face the crankshaft, a rotor provided coaxially with the crankshaft and rotated integrally with the crankshaft and fixed with a permanent magnet, and the inside of the rotor. Only the generator provided with the stator, the starter motor, the starter driven gear to which the driving torque of the starter motor is transmitted and transmitted to the rotor, and the driving force from the starter driven gear to the rotor are transmitted. In an internal combustion engine having a one-way clutch, the one-way clutch is arranged so as to be sandwiched between the rotor and the starter driven gear in the radial direction, and the rotor has a rotor boss portion fixed to the crankshaft and the rotor boss portion. A disk-shaped disk portion centered on the crankshaft, a cylindrical yoke portion extending from the disk portion toward the stator side, and a cylindrical yoke portion to which the permanent magnet is fixed, and a yoke portion from the disk portion to the yoke. part and and a cylindrical one-way clutch holding section for holding the rolled out the one-way clutch toward the opposite side, the rotor has a communication passage for communicating the, and the outside of the internal and the one-way clutch of the one-way clutch The disk portion includes a yoke-side disk portion integrated with the yoke portion and a one-way clutch-side disk portion adjacent to the yoke-side disk portion in the crankshaft direction and integrated with the one-way clutch holding portion. The communication passage is provided in the one-way clutch side disk portion, and the one-way clutch side disk portion is provided on the surface on the yoke side disk portion side and extends radially to the outer peripheral surface of the one-way clutch side disk portion. And a communication hole for communicating the notch and the inside of the one-way clutch, the communication passage is composed of the notch and the communication hole, and the notch is more than the communication hole. It is an internal combustion engine characterized in that it extends inward in the radial direction.

According to the above configuration, the rotor is provided with a communication passage for communicating the inside of the one-way clutch and the outside of the one-way clutch, so that the oil and dust accumulated in the one-way clutch can be discharged and discharged with a simple configuration. Oil can improve the cooling of the permanent magnets of the generator.

In the above configuration, the rotor has a rotor boss portion fixed to the crankshaft, a disk portion extending from the rotor boss portion in a disk shape around the crankshaft, and extending from the disk portion toward the stator side. It has a cylindrical yoke portion to which the permanent magnet is fixed, and a cylindrical one-way clutch holding portion that extends from the disk portion toward the side opposite to the yoke portion and holds the one-way clutch, and is driven by the starter. The gear has a gear boss portion rotatably supported by the crankshaft and a gear portion that rotates integrally with the gear boss portion, and the one-way clutch has a diameter of the one-way clutch holding portion and the gear boss portion. It may be arranged so as to be sandwiched in the direction, and the communication passage may be provided in the disk portion of the rotor.

According to the above configuration, the one-way clutch is sandwiched in the radial direction by the one-way clutch holding portion of the rotor and the gear boss portion of the starter driven gear, and a communication path is provided in the disk portion of the rotor adjacent to the one-way clutch. With the configuration, the oil and dust accumulated in the one-way clutch can be discharged more effectively.

In the above configuration, the disk portion includes a yoke-side disk portion integrated with the yoke portion, and a one-way clutch-side disk portion adjacent to the yoke-side disk portion in the crankshaft direction and integrated with the one-way clutch holding portion. , The continuous passage may be provided in the disk portion on the one-way clutch side.

According to the above configuration, the disk portion is composed of a yoke-side disk portion and a one-way clutch holding portion-side disk portion, and a communication passage is provided in the one-way clutch holding portion-side disk portion adjacent to the one-way clutch. The oil accumulated in the clutch can be discharged toward the yoke-side disk from the communication passage provided in the one-way clutch-side disk adjacent to the one-way clutch, and the yoke is cooled further to generate heat. Can be further cooled.

In the above configuration, the one-way clutch-side disk portion is provided on the surface of the yoke-side disk portion and extends radially to the outer peripheral surface of the one-way clutch-side disk portion, and the inside of the notch and the one-way clutch. It is also possible to have a communication hole for communicating with the above, and the communication passage may be composed of the notch and the communication hole.

According to the above configuration, the one-way clutch side disk portion is provided with a notch portion extending radially to the outer peripheral surface of the one-way clutch side disk portion on the surface on the yoke side disk portion side, and the notch portion and the inside of the one-way clutch are provided. Since the communication hole for communicating with the clutch is provided, the oil inside the one-way clutch flows out from the communication hole through the notch to the disk on the yoke side, which further cools the yoke and makes the permanent magnet more effective. Can be cooled. Further, since the notch extends to the outer peripheral surface of the disk portion on the one-way clutch side, the oil and dust accumulated inside the one-way clutch can be reliably discharged.

In the above configuration, the notch portion may be widened outward in the radial direction.

According to the above configuration, since the notch portion has a wider width toward the outer side in the radial direction, the notch portion is not clogged with oil or dust, and the oil or dust can be discharged more reliably.

In the above configuration, the rotor boss portion, the one-way clutch side disk portion, and the one-way clutch holding portion are integral rotor boss members, and the yoke portion and the yoke side disk portion are integral with the rotor boss. It is a rotor yoke member that is separate from the member, and the rotor may be one in which the rotor boss member and the rotor yoke member are integrally assembled.

According to the above configuration, since the rotor is configured by assembling a separate rotor boss member and rotor yoke member, it is possible to easily process a continuous passage.

In the above configuration, the communication passage may be located radially outside the inner diameter of the one-way clutch.

According to the above configuration, since the communication passage is provided outside the inner diameter of the one-way clutch in the radial direction, oil and dust are more easily discharged due to the centrifugal force accompanying the rotation of the one-way clutch and the rotor.

In the present invention, the rotor is provided with a communication passage that communicates the inside and the outside of the one-way clutch, so that the oil and dust accumulated in the one-way clutch can be discharged with a simple configuration, and the discharged oil can be used to permanently discharge the generator. The cooling of the magnet can be improved.

It is a left side view of the whole motorcycle equipped with the internal combustion engine which concerns on one Embodiment of this invention. It is a left side view of the internal combustion engine of this invention. It is the schematic of the left side surface of an internal combustion engine. It is an IV-IV cross-sectional development view of FIG. It is a VV cross-sectional development view of FIG. It is a VI-VI cross-sectional development view of FIG. It is an enlarged view of the main part of FIG. It is a VI arrow view of FIG. It is a right side view of the rotor 82 of the generator. FIG. 9 is a development view of X-X cutting in FIG. It is a right side view of a one-way clutch. It is a cut-out development view of XII-XII of FIG.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. 1 to 12.
FIG. 1 is an overall left side view of a motorcycle 1 as a saddle-type vehicle equipped with an internal combustion engine 20 according to an embodiment to which the present invention is applied. FIG. 2 is a left side view showing only the mounted state of the internal combustion engine 20 on the vehicle body frame 2. In the description of the present specification and the scope of claims, the front-rear, left-right directions shall be in accordance with the usual standard that the straight-ahead direction of the motorcycle 1 equipped with the internal combustion engine 20 according to the present embodiment is forward.

As shown in FIGS. 1 and 2, the body frame 2 of the motorcycle 1 includes a head pipe 3, a main frame member 4, and a down frame member 5. From the head pipe 3, the main frame member 4 is slightly inclined and extends backward in the center in the vehicle width direction, and then is bent downward to form the main steeply inclined portion 4a. A down frame member 5 extends from the head pipe 3 diagonally rearward and downward at the center in the vehicle width direction.

The front part of the crankcase 22 in the internal combustion engine 20 is attached to the support bracket 5b at the lower part of the down frame member 5 by bolts 8 at two places above and below. The rear portion of the crankcase 22 is attached to the support bracket 4b below the main steeply inclined portion 4a of the main frame member 4 by bolts 9 at two locations above and below. The internal combustion engine 20 is supported by the vehicle body frame 2.

A pair of left and right seat rails 6 extend rearward from the bent portion of the main frame member 4 while forming an intermediate bent portion, and the bent portion of the seat rail 6 and the central portion of the main steeply inclined portion 4a are connected. The back stay 7 supports the seat rail 6.

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

The internal combustion engine 20 mounted on the vehicle body frame 2 is a SOHC type single-cylinder 4-stroke internal combustion engine, in which the crankshaft 31 is oriented in the vehicle body width direction with respect to the vehicle body, and the cylinder is slightly tilted forward in an upright position. Suspended.

The front cover 19f covers the upper part of the down frame member 5 of the vehicle body frame 2 from both the left and right sides, the side cover 19s covers both the left and right sides between the internal combustion engine 20 and the seat 18, and the rear cover 19r covers the latter half of the seat rail 6. There is.

As shown in FIG. 2, the engine body 21 of the internal combustion engine 20 is integrally fastened by stud bolts (not shown) in which the cylinder block 24 and the cylinder head 25 are sequentially stacked diagonally above the left and right split crankcase 22. ing. A cylinder head cover 26 is placed on the cylinder head 25. The cylinder block 24, the cylinder head 25, and the cylinder head cover 26 are projected so as to be slightly forward tilted forward from the crankcase 22.

As shown in FIGS. 4 and 5, the crankshaft 31, main shaft 33, counter shaft 34, and balancer shaft (not shown) oriented in the left-right direction are the right crankcase 22a and the left crank of the left-right split crankcase 22. It is rotatably supported by the case 22b. The outside of the left and right split crankcase 22 is covered with the right case cover 23a and the left case cover 23b, respectively, and is integrally fastened with bolts 96.

In the cylinder block 24 projecting diagonally upward from the crankcase 22, the cylinder sleeve 27 into which the piston 28 is slidably fitted protrudes into the crankcase 22c of the crankcase 22. The connecting rod 32 connects the piston 28 that reciprocates in the cylinder sleeve 27 and the crank pin 31p that is erected between the crank webs 31w and 31w of the crankshaft 31, and drives the crankshaft 31 to rotate according to the movement of the piston 28. ..

A combustion chamber 29 is formed in the lower part of the cylinder head 25 and above the piston 28, and a spark plug 30 is provided in the combustion chamber 29 so as to penetrate the wall surface of the cylinder head 25. An intake / exhaust port (not shown) is formed in the combustion chamber 29, and a valve operating 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 camshaft 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 of the camshaft 41. A cam chain chamber 46 is formed on the left side of the internal combustion engine 20. A cam chain 44 is bridged between the drive sprocket 43 integrally fixed to the crank shaft 31 and the driven sprocket 42, and the power of the crank shaft 31 is transmitted to the cam shaft 41 via the cam chain 44 to be transmitted to the cam shaft 41. Each rocker arm 45 for intake and exhaust is swung by the cam surface 41b of the cam 41a formed on the cam shaft 41 with the rotation of the 41, and the shaft end is brought into contact with the sliding surface of the rocker arm 45. The exhaust valve is designed to be opened and closed at a predetermined timing.

As shown in FIGS. 3 and 4, a gear shifting mechanism 35 is provided located behind the crankshaft 31. In order to transmit a predetermined torque to the rear wheels 15, the gear shifting mechanism 35 uses a gear shifting mechanism (not shown) to engage a plurality of gears provided on the main shaft 33 and the counter shaft 34 to obtain a predetermined gear ratio. It is to be changed as follows. The rotational driving force of the crank shaft 31 is transmitted to the main shaft 33 via the clutch 36, is changed by the gear transmission mechanism 35, is transmitted from the main shaft 33 to the counter shaft 34, and is integrally fastened to the counter shaft 34. Power is transmitted to the rear wheels 15 by the power transmission belt 38 spanned over the rear wheels 15.

As shown in FIG. 3, a balancer mechanism 47 is provided located in front of the crankshaft 31. In the balancer mechanism 47, balance weights 49 are fixed to both ends of the balancer shaft 48 supported by the crankcase 22, the balancer shaft 48 is rotated by the power transmitted from the crankshaft 31, and the internal combustion engine 20 is rotated by the rotation of the balance weight 49. It cancels the vibration caused by the piston 28. The balance weight 49 arranged on the left side is accommodated in the balance weight space 58 formed in front of the left crankcase 22b.

As shown in FIG. 3 and FIG. 5, a starter motor located above the rear of the crankshaft 31 and receiving power from a battery (not shown) when starting the internal combustion engine 20 to rotate the crankshaft 31. 60 are arranged.

As shown in FIGS. 3 and 6, the oil pump 50 is arranged 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) so that the rotational driving force of the crankshaft 31 is transmitted to the oil pump shaft 51 via the gear 52 to drive the oil pump 50. It has become. Below the crankcase 22, the right crankcase 22a and the left crankcase 22b are combined to form an oil pan 53. The right crankcase 22a is formed with a supply oil passage 54 for supplying lubricating oil to the oil pump 50 upward from the oil pan 53. An oil strainer 55 is held between the oil pump 50 and the supply oil passage 54 by a right crankcase 22a and a right case cover 23a.
The lubricating oil stored in the oil pan 53 is pumped from the supply oil passage 54 by the oil pump 50. The lubricating oil is formed in the supply oil passage 56 and the right crankcase 22a formed in the right case cover 23a. It passes through the supply oil passage 57 and is sent to the key points of the internal combustion engine 20 such as the crankshaft 31 and the valve operating mechanism 40 for the purpose of lubrication and cooling. The lubricating oil sent to the key points is scattered in the internal combustion engine 20, travels through various parts in the internal combustion engine 20, returns to the oil pan 53, and is pumped again by the oil pump 50.

As shown in FIG. 3, the starter motor 60 is arranged so as to be located above the rear of the left crankcase 22b. A starter reduction gear 61 and a starter driven gear 63 are arranged below and in front of the starter motor 60.

As shown in FIG. 5, in the starter reduction gear 61, a large-diameter gear 61a and a small-diameter gear 61b are formed adjacent to each other 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 mesh 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. It is rotatably supported by the reduction gear shaft support boss 92b.

As shown in FIGS. 5 and 6, 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 gear boss portion 63b supported by the crankshaft 31.

FIG. 7 is an enlarged view of a main part of FIG. 6, and FIG. 8 is a view of the starter driven gear 63 and the bush 64 as viewed from the generator 81 side. As shown in FIGS. 6 to 8, the starter driven gear 63 is rotatably supported on the crankshaft 31 via a substantially cylindrical bush 64. As shown in FIGS. 7 and 8, oil supply grooves 64b are spirally formed on the inner peripheral surface 64a of the bush 64 up to the left and right end surfaces 64c and 64d of the bush. The oil scattered in the crankcase 22 is supplied to a position where the bush 64 and the crankshaft 31 are in sliding contact with each other through the oil supply groove 64b along the crankshaft 31.

As shown in FIG. 6, the gear boss portion 63b of the starter driven gear 63 is supported by the crankshaft 31 so as to be in contact with the rotor 82 of the generator 81 described later. As shown in FIG. 8, a plurality of groove portions 63d are formed on the end surface 63c of the gear boss portion 63b of the starter driven gear 63 on the side in contact with the rotor 82. The groove portion 63d is formed with a predetermined width in the radial direction so as to connect the inner peripheral surface 63e and the outer peripheral surface 63f of the gear boss portion 63b. The oil that has passed through the oil supply groove 64b of the bush 64 supplies oil to the sliding contact point between the gear boss portion 63b of the starter driven gear 63 and the disk portion 85 described later of the adjacent rotor 82, and also oils in the one-way clutch 65. To supply.

As shown in FIGS. 4 and 6, a generator 81, which is located on the left side of the internal combustion engine 20 and is a generator for supplying power to a battery (not shown) of the internal combustion engine 20, is provided in the generator chamber 80. It is arranged. In the generator chamber 80, the left crankcase 22b and the left case cover 23b, which is in contact with the outside of the left crankcase 22b and serves as a generator cover 90, are integrally fixed by bolts 96 and are composed of the inside thereof. There is.

The generator 81 includes a rotor 82 attached to the left end 31a of the crankshaft 31 protruding from the crank chamber 22c into the generator chamber 80, and a stator 89 attached to the generator cover 90 facing the inside of the rotor 82.

As shown in FIG. 6, the stator 89 disposed so as to face the inside of the rotor 82 includes a donut-shaped mounting plate 89a and a plurality of mounting plates 89a extending radially from the circumference of the mounting plate 89a. It includes a bobbin portion 89c and a coil portion 89d wound around the bobbin portion 89c.

As shown in FIG. 6, a tubular support portion 95 for supporting the stator 89 of the generator 81 is formed at the center of the bottom surface 91a of the bowl-shaped portion 91. The tubular support portion 95 has a cylindrical portion 95a that is formed in a cylindrical shape and projects inward toward the crankcase 22 side, and three screw holes 95c that project from the wall surface of the cylindrical portion 95a in the circumferential direction at approximately equal intervals. It includes a formed boss portion 95b. The stator 89 is fixed to the tubular support portion 95 by fastening the bolt 97 through which the perforated bolt insertion hole 89b of the mounting plate 89a of the stator 89 is inserted to the screw hole 95c of the tubular support portion 95. It has become.

As shown in FIGS. 6 and 10, the rotor 82 includes a rotor boss portion 83a, a disk portion 85, a yoke portion 84a, and a one-way clutch holding portion 83c. The rotor boss portion 83a is formed in a cylindrical shape through which the crankshaft 31 is inserted and fixed so as to rotate integrally with the crankshaft 31. The disk portion 85 is formed in a disk shape extending radially outward from the rotor boss portion 83a. The yoke portion 84a extends from the disk portion 85 to the stator 89 side in a cylindrical shape, and a permanent magnet 87 is attached to the inner peripheral surface. The one-way clutch holding portion 83c extends from the disk portion 85 to the side opposite to the yoke portion 84a, and holds the one-way clutch 65 that transmits only one-way power from the starter motor 60 to the crankshaft 31.

As shown in FIG. 10, in the rotor 82 of the generator 81, the rotor boss member 83 provided with the rotor boss portion 83a and the bowl-shaped rotor yoke member 84 into which the rotor boss portion 83a of the rotor boss member 83 is inserted are integrated by caulking 69. It is fixed to.

The rotor boss member 83 has a one-way clutch side disk portion 83b formed in a disk shape centered on the crankshaft 31 from the right end of the cylindrical rotor boss portion 83a in which the crankshaft 31 is inserted and fixed and rotates integrally with the crankshaft 31. A one-way clutch holding portion 83c that extends cylindrically from the outer edge of the one-way clutch side disk portion 83b and holds the one-way clutch 65 on the inner peripheral surface is formed. The disk portion 83b on the one-way clutch side is provided with a plurality of caulking holes 83e through which the caulking 69 is inserted in the circumferential direction.

As shown in FIGS. 9 and 10, the rotor yoke member 84 is formed in a bottomed cylindrical shape, and a yoke-side disk portion having a boss portion insertion hole 84c in which the rotor boss portion 83a of the rotor boss member 83 is inserted is formed in the center. A yoke portion 84a is formed on a cylindrical peripheral wall that directs from the outer edge of 84b to the stator 89 side. A plurality of caulking holes 84e through which the caulking 69 is inserted are formed in the yoke-side disk portion 84b at positions corresponding to the caulking holes 83e of the one-way clutch-side disk portion 83b. A permanent magnet 87 is attached to the inner peripheral surface of the yoke portion 84a by a jig 88.

Insert the rotor boss portion 83a of the rotor boss member 83 into the boss portion insertion hole 84c of the rotor yoke member 84 until the yoke side disk portion 84b abuts on the one-way clutch side disk portion 83b, and align the positions of the caulking holes 83e and 84e, respectively. Then, the caulking 69 is inserted and caulked, and the rotor boss member 83 and the rotor yoke member 84 are assembled into an integrated rotor 82. The disk portion 85 of the rotor 82 is composed of the disk portion 83b on the one-way clutch side and the disk portion 84b on the yoke side.

As shown in FIG. 6, the one-way clutch 65 is held inside the one-way clutch holding portion 83c of the rotor boss member 83. As shown in FIGS. 10 and 11, the one-way clutch 65 includes an outer 66, a plurality of rollers 67 housed in the outer 66, and a spring that urges the roller 67 in a direction of pressing the roller 67 against the roller regulating portion 66c described later. It is equipped with 68. As shown in FIG. 12, the outer 66 has a ring-shaped side wall portion 66b formed on one side of the cylindrical outer peripheral wall portion 66a and a folded portion 66d formed on the other side. The side wall portion 66b is provided with roller regulation portions 66c that regulate the movement of the rollers 67 so as to project toward the other side at predetermined intervals.

A roller 67 is arranged in contact with one roller regulating portion 66c between a set of adjacent roller regulating portions 66c, and a compressed spring 68 is provided between the roller 67 and the other roller regulating portion 66c. The rollers 67 are arranged and urged by a spring 68 toward the roller regulating portion 66c which is always in contact with the rollers 67.

The outer 66 of the one-way clutch 65 is press-fitted and held inside the tubular one-way clutch holding portion 83c of the rotor boss member 83, and rotates integrally with the rotor boss member 83. As shown in FIG. 6, a gear boss portion 63b of the starter driven gear 63 arranged adjacent to the rotor boss member 83 is inserted inside the one-way clutch 65, and the one-way clutch 65 is a rotor in the radial direction. It is sandwiched between the one-way clutch holding portion 83c of the rotor boss member of 82 and the gear boss portion 63b of the starter driven gear 63.

As shown in FIG. 11, the inner peripheral surface 66e of the outer 66 is not formed to have the same diameter in the circumferential direction, and the amount of protrusion of the inner peripheral surface 66e of the outer 66 inward in the radial direction is a roller. in the case where 67 is in contact with the roller regulating portion 66c, from the point 66e ₁ the roller 67 is in contact with the inner peripheral surface 66e, and decreases as the circumferential direction of the inner peripheral surface 66e away from the roller regulating portion, the inner The peripheral surface 66e is formed on such a cam surface 66f.

When the starter motor 60 starts and the starter driven gear 63 rotates in the direction of pressing the roller 67 against the roller regulation portion 66c of the outer 66 (rotates counterclockwise in FIG. 11), the roller 67 is radially inside by the cam surface 66f of the outer 66. It is strongly sandwiched between the outer peripheral surface of the gear boss portion 63b of the starter driven gear 63 and the cam surface 66f of the outer 66. As the starter driven gear 63 rotates, the outer 66 of the one-way clutch 65 also rotates, and the rotational force is transmitted to the rotor boss member 83 having the one-way clutch holding portion 83c, and the rotor boss portion 83a of the rotor boss member 83 rotates the crankshaft 31. Then, the internal combustion engine 20 is started.

When the internal combustion engine 20 starts to start and stops driving the starter motor 60, the rotation of the starter driven gear 63 is stopped, and the one-way clutch holding portion 83c is a roller relative to the gear boss portion 63b of the starter driven gear 63. The roller 67 rotates in the direction away from the regulating portion 66c (rotation counterclockwise in FIG. 11). The roller 67 separates from the roller regulating portion 66c against the urging force of the spring 68, and the roller 67 moves radially outward by the cam surface 66f of the outer 66 along the cam surface 66f of the outer 66, and the starter driven gear 63. The outer peripheral surface of the gear boss portion 63b and the cam surface 66f of the outer 66 are no longer pinched, and the starter driven gear 63 does not rotate due to the rotation of the outer 66 of the one-way clutch 65. No rotational force is transmitted.

The inner diameter 65a of the one-way clutch 65 is defined as follows. As shown in FIG. 11, the inner diameter 65a of the one-way clutch 65 means the one-way clutch of the rollers 67 when the roller 67 is pushed out to the innermost diameter of the one-way clutch 65 in the radial direction according to the cam surface 66f of the outer 66. In the radial direction of 65, it means the diameter of a circle connecting the innermost 67b of the innermost portion. That is, the inner diameter 65a of the one-way clutch 65 is substantially the same as the outer diameter of the gear boss portion 63b of the starter driven gear 63.
The outer diameter 65c of the one-way clutch 65 refers to the diameter of the outer peripheral wall portion 66a of the outer 66.

As shown in FIGS. 6 and 10, the rotor 82 of the generator 81 communicates with the inside 65b of the one-way clutch 65 and the outside of the one-way clutch 65 located radially outside the inside 65b of the one-way clutch 65. A passage 86 is provided. The inner 65b of the one-way clutch 65 is surrounded by the outer peripheral wall portion 66a and the side wall portion 66b of the outer 66 of the one-way clutch 65, the outer peripheral surface of the gear boss portion 63b of the starter driven gear 63, and the side surface of the disc portion 83b on the one-way clutch side. It means a space.

In the present embodiment, the communication passage 86 is composed of a notch portion 86a and a communication hole 86b, which will be described later, and is provided in the one-way clutch side disk portion 83b of the rotor boss member 83 among the disk portions 85 of the rotor 82. ..

_{As shown in FIG. 10, the notch portion 86a is provided on the surface 83b 1} on the yoke side disk portion 84b side adjacent to the one-way clutch side disk portion 83b at a predetermined depth in the one-way clutch side disk in the radial direction. It is formed so as to reach the outer peripheral surface 83d of the portion 83b. Further, as shown in FIG. 9, the notch 86a is formed in a substantially fan shape so that the width of the notch increases toward the outer side in the radial direction, and a plurality of notches 86a are formed in the circumferential direction.

The one-way clutch side disk portion 83b is formed with a communication hole 86b that penetrates the notch portion 86a and the inside 65b of the one-way clutch 65 so as to communicate with each other. A plurality of communication holes 86b are provided in the circumferential direction of the one-way clutch side disk portion 83b so as to correspond to the position of the notch portion 86a.

As shown in FIG. 10, the opening 86c communicating with the inside 65b of the one-way clutch 65 of the communication hole 86b is located on the centrifugal side of rotation, that is, the inner diameter 65a and the outer diameter 65c of the one-way clutch 65 in the inside 65b of the one-way clutch 65. There is an opening closer to the outer diameter of 65c. In this way, since the opening 86c of the communication passage 86 is provided so as to open on the centrifugal side of the rotation of the one-way clutch 65, the oil and dust accumulated in the internal 65b of the one-way clutch 65 are discharged by centrifugal force. It's getting easier. In the present embodiment, the entire opening 86c is provided with an opening on the centrifugal side of rotation, but the same effect can be obtained if at least a part of the opening 86c is open on the centrifugal side. it can.

In the present embodiment, the communication passage 86 that communicates the inside 65b of the one-way clutch 65 with the outside is composed of a notch 86a and a communication hole 86b of the disk portion 83b on the one-way clutch side, and the communication passage 86 is a crankshaft. Since the one-way clutch 65 is provided on the generator 81 side in the direction, oil and dust in the one-way clutch 65 are discharged toward the outer peripheral surface of the yoke portion 84a of the rotor yoke member 84, and the yoke portion 84a is cooled. As a result, the permanent magnet 87 is cooled.

Further, as shown in FIG. 10, the communication passage 86 is provided outside the inner diameter 65a of the one-way clutch 65, and oil and dust in the one-way clutch 65 are easily discharged by the centrifugal force during rotation of the rotor 82. Will be done.

In the present embodiment, the communication passage 86 is composed of a notch 86a and a communication hole 86b of the one-way clutch side disk 83b, but the one-way clutch side disk 83b and the yoke side disk 83b are not provided. It may be composed of a through hole penetrating the 84b. In such a configuration, oil and dust in the one-way clutch 65 pass through the one-way clutch side disk portion 83b and the yoke side disk portion 84b and are discharged to the inside of the yoke portion 84a of the rotor yoke member 84, and the rotor yoke member 84 is discharged. The permanent magnet is cooled.

Since the present embodiment is configured as described above, the following effects are obtained.

The internal combustion engine 20 of the present embodiment faces the crankshaft 31 and the rotor 82 which is provided coaxially with the crankshaft 31 and is rotated integrally with the crankshaft 31 to which the permanent magnet 87 is fixed and the inside of the rotor 82. A generator 81 having a stator 89, a starter motor 60, a starter driven gear 63 in which the drive torque of the starter motor 60 is transmitted to the rotor 82, and a starter driven gear 63 to the rotor 82. It has a one-way clutch 65 that transmits only the driving force, and the one-way clutch 65 is arranged so as to be sandwiched in the radial direction between the rotor 82 and the starter driven gear 63, and the rotor 82 is the inside 65b of the one-way clutch 65 and the one-way clutch. Since it has a communication passage 86 that communicates with the outside of the 65, the oil and dust accumulated in the one-way clutch 65 are discharged with a simple configuration, and the discharged oil cools the permanent magnet 87 of the generator 81. Can be improved.

Further, the rotor 82 has a rotor boss portion 83a fixed to the crank shaft 31, a disk portion 85 extending from the rotor boss portion 83a in a disk shape around the crank shaft 31, and extending from the disk portion 85 toward the stator 89 side. It has a cylindrical yoke portion 84a to which the permanent magnet 87 is fixed, and a cylindrical one-way clutch holding portion 83c that extends from the disk portion 85 toward the opposite side of the yoke portion 84a and holds the one-way clutch 65. The driven gear 63 has a gear boss portion 63b rotatably supported by the crank shaft 31 and a gear portion 63a that rotates integrally with the gear boss portion 63b, and has a one-way clutch 65, a one-way clutch holding portion 83c, and a gear boss portion 63b. Since the communication passage 86 is provided in the disk portion 85 of the rotor 82 so as to be sandwiched in the radial direction, the communication passage 86 is provided in the disk portion 85 of the rotor 82 adjacent to the one-way clutch 65. With a simple configuration, oil and dust accumulated in the one-way clutch 65 can be discharged more effectively.

Further, the disk portion 85 is composed of a yoke-side disk portion 84b integrated with the yoke portion 84a, and a one-way clutch-side disk portion 83b adjacent to the yoke-side disk portion 84b in the crankshaft direction and integrated with the one-way clutch holding portion 83c. Since the communication passage 86 is provided in the one-way clutch side disk portion 83b, the oil accumulated in the one-way clutch 65 is discharged from the communication passage 86 provided in the one-way clutch side disk portion 83b adjacent to the one-way clutch 65 to yoke. It can be discharged toward the side disk portion 84b, the yoke portion 84a can be further cooled, and the generated permanent magnet 87 can be further cooled.

Furthermore, the one-way clutch side disk portion 83b has a _{notch 86a provided on the surface 83b 1} on the yoke side disk portion 84b side and extending radially to the outer peripheral surface 83d of the one-way clutch side disk portion 83b, and the notch 86a and the one-way. Since it has a communication hole 86b that communicates with the inside 65b of the clutch 65, and the communication passage 86 is composed of the notch 86a and the communication hole 86b, the oil inside the one-way clutch 65 is notched from the communication hole 86b. Since the oil flows out through the portion 86a toward the yoke-side disk portion 84b, the yoke portion 84a can be cooled more effectively and the permanent magnet 87 can be cooled more effectively. Further, since the notch portion 86a extends to the outer peripheral surface 83d of the one-way clutch side disk portion 83b, the oil and dust accumulated in the inside 65b of the one-way clutch 65 can be reliably discharged.

Further, since the cutout portion 86a is designed so that the width increases toward the outer side in the radial direction, the cutout portion 86a is not clogged with oil or dust, and the oil or dust can be discharged more reliably.

Further, the rotor boss portion 83a, the one-way clutch side disk portion 83b, and the one-way clutch holding portion 83c are integrated rotor boss members 83, and the yoke portion 84a and the yoke side disk portion 84b are integrated and separate from the rotor boss member 83. The rotor yoke member 84 of the body, and the rotor 82 is configured by integrally assembling the rotor boss member 83 and the rotor yoke member 84, so that the communication passage 86 can be easily processed.

Furthermore, since the communication passage 86 is provided radially outside the inner diameter 65a of the one-way clutch 65, oil and dust are more easily discharged due to the centrifugal force accompanying the rotation of the one-way clutch 65 and the rotor 82.

In the present embodiment, the communication passage 86 provided in the rotor 82 is composed of a notch 86a provided in the one-way clutch side disk portion 83b and a communication hole 86b. For example, the one-way clutch side disk portion 83b A communication hole is provided through the disk portion 85 composed of the disk portion 84b on the yoke side and the inside 65b of the one-way clutch 65 and used as a communication passage 86 for communicating the outside, and the oil in the one-way clutch 65 is used as a rotor. It is also possible to guide the inside of the 82 to directly cool the heat-generating permanent magnet 87.

Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above embodiments, and it goes without saying that the embodiments are included in various embodiments within the scope of the gist of the present invention.
For example, the internal combustion engine of the present invention is not limited to the internal combustion engine according to the embodiment as long as it meets the requirements of each claim, and is not limited to the internal combustion engine shown in the embodiment regardless of the number of cylinders.

1 ... Motorcycle, 20 ... Internal combustion engine, 31 ... Crankshaft, 60 ... Starter motor, 61 ... Starter reduction gear, 62 ... Reduction gear shaft, 63 ... Starter driven gear, 65 ... One-way clutch, 65a ... Inner diameter, 65b ... Internal ,
80 ... Generator chamber, 81 ... Generator, 82 ... Rotor, 83 ... Rotor boss member, 83a ... Rotor boss part, 83b ... One-way clutch side disk part, 83c ... One-way clutch holding part, 83d ... Outer peripheral surface, 84 ... Rotor yoke member, 84a ... Yoke part, 84b ... Yoke side disk part, 85 ... Disk part, 86 ... Communication passage, 86a ... Notch part, 86b ... Communication hole, 87 ... Permanent magnet, 89 ... Stator.

Claims (5)

A crankshaft (31), a rotor (82) provided coaxially with the crankshaft (31), rotated integrally with the crankshaft (31), and a permanent magnet (87) fixed to the rotor (82) and the inside of the rotor (82). The drive torque of the generator (81), the starter motor (60), and the starter motor (60) having the stator (89) arranged to face the rotor (82) is transmitted to the rotor (82). In an internal combustion engine having a starter driven gear (63) and a one-way clutch (65) that transmits only the driving force from the starter driven gear (63) to the rotor (82).
The one-way clutch (65) is arranged so as to be sandwiched in the radial direction between the rotor (82) and the starter driven gear (63).
The rotor (82) has a rotor boss portion (83a) fixed to the crankshaft (31) and a disk-shaped disk portion centered on the crankshaft (31) on the radial outer side of the rotor boss portion (83a). (85), a cylindrical yoke portion (84a) extending from the disk portion (85) toward the stator (89) side and fixing the permanent magnet (87), and the disk portion (85) to the above. It has a yoke portion (84a) and a cylindrical one-way clutch holding portion (83c) that extends toward the opposite side and holds the one-way clutch (65).
The rotor (82) has a communication passage (86) that communicates the inside (65b) of the one-way clutch (65) and the outside of the one-way clutch (65).
The disk portion (85) includes a yoke-side disk portion (84b) integrated with the yoke portion (84a) and a one-way clutch holding portion (83c) adjacent to the yoke-side disk portion (84b) in the crankshaft direction. Equipped with an integrated one-way clutch side disk (83b),
The communication passage (86) is provided in the one-way clutch side disk portion (83b).
The one-way clutch side disk portion (83b) is provided on the surface on the yoke side disk portion (84b) side and extends radially to the outer peripheral surface (83d) of the one-way clutch side disk portion (83b). And a communication hole (86b) for communicating the notch (86a) and the inside (65b) of the one-way clutch (65).
The communication passage (86) is composed of the notch (86a) and the communication hole (86b).
An internal combustion engine characterized in that the notch portion (86a) extends radially inward from the communication hole (86b). The starter driven gear (63) has a gear boss portion (63b) rotatably supported by the crankshaft (31) and a gear portion (63a) that rotates integrally with the gear boss portion (63b).
The one-way clutch (65) is an internal combustion engine according to claim 1, characterized in that said one-way de-clutch holder and (83c) wherein Giabosu part and (63 b), which is arranged to be sandwiched in radial direction. The internal combustion engine according to claim 1 or 2, wherein the cutout portion (86a) has a width increasing outward in the radial direction. The rotor boss portion (83a), the one-way clutch side disk portion (83b), and the one-way clutch holding portion (83c) are integral rotor boss members (83).
The yoke portion (84a) and the yoke-side disk portion (84b) are integrated, and the rotor yoke member (84) is a separate body from the rotor boss member (83).
The internal combustion engine according to any one of claims 1 to 3, wherein the rotor (82) is integrally assembled with the rotor boss member (83) and the rotor yoke member (84). The internal combustion engine according to any one of claims 1 to 4, wherein the communication passage (86) is located radially outside the inner diameter (65a) of the one-way clutch (65).

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