JP3189020B2 - Motorcycle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle engine and, more particularly, to a structure of a motor type starting device.

[0002]

2. Description of the Related Art Conventionally, motorcycles used for racing include motorcycles formed exclusively for racing and motorcycles for public roads modified for racing. In many cases, the engine mounted on the motorcycle dedicated to racing (hereinafter referred to as the engine dedicated to racing) is not provided with a starting device, and the engine mounted on the motorcycle for driving on public roads is provided with a kick type or motor type starting device. Was installed.

[0003]

SUMMARY OF THE INVENTION The inventor of the present invention has conceived of making it possible to convert a conventional motorcycle dedicated to racing from racing to public running. That is, public road components such as security components are detachably attached to the motorcycle dedicated to racing.

[0004] In doing so, however,
The structure of the starting device was a problem. It is desirable to mount a motor-type starter on the advantage that it can be started easily.However, to install a motor-type starter on a conventional racing engine, the structure of the crankshaft and crankcase must be significantly changed. There must be. In other words, a new starter gear to which the power from the starter motor is transmitted to the crankshaft must be newly mounted, and the crankcase must be changed to another one with a starter motor and a group of reduction gears for power transmission. Cost increases.

[0005] It is also conceivable to use an engine with a motor-type starter for a motorcycle on a public road that can be modified for racing. However, this type of engine cannot remove all of the starter and reduces the weight. It is inferior to the engine of a motorcycle for racing. This is because a starter gear is arranged between a generator and a crank web arranged on an end side of a crankshaft, and the starter gear is connected to a starter motor via a reduction gear group for a starting device in a crankcase. Because there is.

In order to solve this problem, a one-way clutch is attached to the outer end of the generator rotor in the vehicle width direction, and a starter gear rotated by a starter motor is detachably connected to the rotor via the one-way clutch. In some cases, starting device components such as a starter gear, a reduction gear group, and a starter motor are attached to a lid that closes a generator accommodating space of a crankcase (for example, Japanese Patent Application Laid-Open No. Sho 61-2).
29970). In the engine disclosed in this publication, when the public road vehicle is returned to the race only, the lid with the starting device may be replaced with a lid without this, so that the engine is lighter without any design change. It can be retrofitted to a race-only vehicle. A starter gear is mounted on the lid with the starting device, and a member constituting a one-way clutch is fixed to the starter gear,
When the lid is removed from the crankcase, the one-way clutch is disassembled. For this reason, when the starter gear is connected to the rotor via the one-way clutch when the vehicle is refurbished for running on a public road again, it is necessary to confirm the operation of the clutch. However, the operation of the one-way clutch cannot be confirmed in the engine shown in this cited example because the cover is completely covered when the lid is connected to the crankcase. Since the reduction gear is located inside the starter gear in the vehicle width direction, the starter gear cannot be detached from the lid and assembled alone with the one-way clutch to the rotor. This is because the reduction gear uses a bolt for fixing the lid to the crankcase as a support shaft. Also, the starter gear must be connected to the rotor simultaneously with the connection of the lid, but since the heavy starter motor is mounted at a position offset from the center, hold the lid so that it does not tilt. Joining of the starter gear requires skill and is not easy.

The present invention has been made in order to solve such a problem, and a motor-type starter is mounted on a conventional racing engine without greatly changing the structure of a crankshaft and a crankcase. Another object of the present invention is to make it possible to easily attach and detach the motor type starting device.

[0008]

A motorcycle engine according to the present invention has a rotor in which a generator accommodating space is formed on a side of a crankcase by a crankcase and a lid, and is attached to a shaft end of a crankshaft. In a motorcycle engine in which a generator is accommodated in the generator accommodating space and a motor-type starting device is provided in the lid, the lid is formed so as to open outward in the vehicle width direction. A crankcase cover having one end attached to the crankcase, and a gear cover closing the opening of the crankcase cover, and a gear case extending from the generator housing space in a direction perpendicular to the vehicle width direction on both covers. The starter motor is attached to the gear case forming part of the crankcase cover, and the output of this starter motor is With the car facing the gear case, a starter gear is attached to the outer end of the rotor via a one-way clutch, and the output gear and the starter gear are connected via a reduction gear group housed in the gear case. The support shaft of each gear of the reduction gear group is rotatably and detachably fitted into a shaft hole formed in the gear case forming portion of the crankcase cover and a shaft hole formed in the gear case forming portion of the gear cover. The meshing portion of each of the gears is positioned outside the starter gear in the vehicle width direction.

[0009]

Since the motor type starter is externally attached to the crankcase, it is only necessary to add a starter mounting portion to the crankcase when mounting the starter on the racing engine. Also, when remodeling a race-dedicated vehicle for driving on a public road with a motor-type starting device, first attach a starter gear to the generator rotor via a one-way clutch, then attach a reduction gear group, and finally attach a gear cover. Can be done by mounting. That is, the starter gear can be assembled to the rotor before the inside is closed by the gear cover. Further, in the remodeling work, first, one end of the crankcase cover is attached to the opening of the crankcase. At this time, the crankcase cover has a state in which only the starter motor is attached and the reduction gear group is not attached. can do. In addition, since the reduction gear group can be temporarily supported only on the crankcase cover, and the starter gear can be temporarily supported on the rotor, the gear cover can be temporarily attached to the crankcase cover in a state where other members are not attached to the gear cover. Can be installed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view of a motorcycle equipped with an engine according to the present invention, FIG. 2 is a side view of a motorcycle engine according to the present invention, FIG. 3 is a front view thereof, and FIG. FIG. 4 is a sectional view taken along line IV.

In these figures, reference numeral 1 denotes a motorcycle,
The motorcycle 1 has a structure in which security components such as a headlight, a taillight, a flasher, and a rearview mirror can be attached and detached so that the motorcycle 1 can be appropriately changed between a public road running specification and a racing specification. FIG. 1 shows a state in which the security parts have been removed.

Reference numeral 2 denotes a frame of the motorcycle 1, reference numeral 3 denotes a front fork rotatably supported by a head pipe 4 of the frame 2, and reference numeral 5 denotes an up / down swing of a rear arm bracket 6 of the frame 2 via a pivot shaft 7. The rear arm is freely supported. A steering handle 8 is attached to an upper portion of the front fork 3, and a front wheel 9 is rotatably supported at a lower end portion. A rear wheel 10 is rotatably supported by the rear arm 5.

Reference numeral 11 denotes a fuel tank, 12 denotes a seat, and 13 denotes an engine of the motorcycle 1. This engine 13
Is a water-cooled two-cycle V-type two-cylinder, in which an upper cylinder 15 and a lower cylinder 16 attached to a crankcase 14 are arranged in a V-shape that opens forward as viewed from the side of the vehicle body. . In addition, both upper and lower cylinders 1
3, the upper cylinder 15 is located on the left side of the vehicle body, and the lower cylinder 16 is located on the right side of the vehicle body.

Reference numeral 17 denotes an exhaust pipe of the upper cylinder 15.
The exhaust pipe 17 extends forward and downward from the upper cylinder 15 disposed forward and is bent rearward in front of the crankcase 14, passes directly below the engine 13 and below the pivot shaft 7, and passes through the rear arm 5. It extends to the left. The large-diameter chamber portion 17a of the exhaust pipe 17
Is formed so that the portion located below the rear arm bracket 6 is the thickest.

Reference numeral 18 denotes an exhaust pipe of the lower cylinder 16.
The exhaust pipe 18 extends rearward and downward from the lower cylinder 16 disposed forward and downward below the engine 13, and extends to the right of the rear arm 5 below the pivot shaft 7. The large-diameter chamber portion 18a of the exhaust pipe 18 is formed so that the portion located below the front portion of the rear arm 5 is the thickest.

Reference numeral 19 denotes a carburetor for supplying fuel to the upper cylinder 15, and reference numeral 20 denotes a carburetor for supplying fuel to the lower cylinder 16. These carburetors 19 and 20 are both mounted on the crankcase 14.

Reference numeral 21 denotes a starting device according to the present invention. As shown in FIGS. 2 to 4, the starting device 21 includes a starter motor 22 serving as a power source, and an output gear 22 a of the starter motor 22 via a reduction gear group including a first gear 23 and a second gear 24. A connected starter gear 25, a one-way clutch 27 for transmitting the rotation of the starter gear 25 to a crankshaft 26 of the engine 13, a gear cover 28 for covering the outside of the reduction gear group and the starter gear 25 in the vehicle width direction, a crankcase cover 31 and the like. As shown in FIGS. 2 and 4, the gear cover 28 and the crankcase cover 31 form a gear case that extends downward from a space (generator housing space) S that houses the generator 29. The gear case forming portion of the gear cover 28 is indicated by reference numeral 28b in FIG. 4, and the gear case forming portion of the crankcase cover 31 is indicated by reference numeral 31a. The reduction gear group is accommodated in this gear case.

The crankshaft 26 has a shaft end rotatably supported by the crankcase 14 via a bearing 26a. A rotor 30 of a generator 29 is mounted on a portion extending from the bearing 26a to the left in the vehicle width direction. Have been. In addition,
The rotation of the rotor 30 with respect to the crankshaft 26 is regulated by a key. The coil assembly 29a of the generator 29 is supported and fixed to a crankcase. The extension of the crankshaft 26 is formed as short as possible in order to reduce the weight of the crankshaft 26 as an engine dedicated to racing.

The starter motor 22 is mounted with its axis parallel to the vehicle width direction. As shown in FIG. 4, the starter motor 22 outputs power to the gear case forming portion 31a of the crank case cover 31 which closes the left side opening of the crank case 14 on the vehicle body. It is positioned by fitting the gear side end and is attached via a bracket (not shown). The structure of the part for fixing the starter motor 22 to the crankcase cover 31 is such that the screws and the like are loosened.
2 can be attached and detached.

The mounting position of the starter motor 22 is set below the crankcase 14 and substantially below the crankshaft 29. In other words, as shown in FIGS. 2 and 3, the starter motor 22 is located between the crankcase 14 and a relatively narrow portion of the exhaust pipe 17 on the upstream side of the chamber 17 a and is located upstream of the exhaust pipe 18. It is located at the side end of the vehicle, just beside the left side of the vehicle.

The first gear 23 is a two-stage gear having a first gear 23a and a second gear 23b having different diameters.
It is rotatably supported by a support shaft 32 that is parallel to the vehicle width direction. The large-diameter first gear 23a meshes with the output gear 22a of the starter motor 22, and the small-diameter second gear 23b located inside the vehicle width direction meshes with a second gear 24 described later. The second gear 24 is also a two-stage gear having a third gear 24a and a fourth gear 24b having different diameters, and is rotatably supported by a support shaft 33 parallel to the support shaft 32. The large-diameter third gear 24a is connected to the second gear 23.
b, and a small-diameter fourth gear 24b located inside in the vehicle width direction is engaged with a gear 25a of a starter gear 25 described later. That is, the first gear 23 and the second gear 24
Are positioned outside the starter gear 25 in the vehicle width direction. One end of each of the support shafts 32 and 33 has a gear case forming portion 31 of the crankcase cover 31.
a, and the other end is fitted and supported by a gear case forming portion 28b of the gear cover 28. More specifically, shaft holes 31b, 3 formed in the gear case forming portion 31a.
One end of the support shafts 32 and 33 is fitted and supported by 1c, and the other end of the support shafts 32 and 33 is supported by shaft holes 28c and 28d formed in the gear case forming portion 28b. Of these shaft holes, the shaft holes 31b and 31c formed in the crankcase cover 31 are the shaft holes 28 formed in the gear cover 28.
It is formed so that the fitting length is longer than c and 28d.

The starter gear 25 gear-coupled to the fourth gear 24b has a cylindrical inner race 27a of a one-way clutch 27 fixed to the shaft center, and a ball bearing 34 fitted into the inner periphery of the inner race 27a. It is rotatably supported by the gear cover 28 via the same. The connection structure between the ball bearing 34 and the gear cover 28 has a structure in which the inner ring of the ball bearing 34 is fitted into a boss 28a projecting inward from the plate-like portion of the gear cover 28.

The one-way clutch 27 includes an inner ring 27a having a starter gear 25, an outer ring 27b arranged on the outer peripheral side of the inner ring 27a, and a roller 27c interposed between the inner ring 27a and the outer ring 27b. In this case, the driving force is transmitted only from the inner ring 27a to the outer ring 27b. The outer race 27b of the one-way clutch 27 is connected to the rotor 30 of the generator 29.
Is screwed to the outer end in the vehicle width direction.

The gear cover 28 includes the support shafts 32, 3
A portion (the shaft holes 28c and 28d of the boss portion 28a and the gear case forming portion 28b) for supporting these members so as to integrally hold the bearing 3 and the ball bearing 34 is provided in series, and an opening 31d of the crankcase cover 31 is provided. Is screwed to the crankcase cover 31 in a state of closing. By screwing the gear cover 28 to the crankcase cover 31, the space S accommodating the reduction gear group, the starter gear 25, the one-way clutch 27 and the generator 29 is closed by the gear cover 28.

In the starting device 21 configured as described above,
When the starter motor 22 is energized when the engine is started and the output gear 22 a rotates, the rotation is transmitted to the starter gear 25 via the first gear 23 and the second gear 24. The inner ring 27a of the one-way clutch 27 rotates together with the starter gear 25, and the outer ring 27b
Rotate in the same direction, and the rotor 30 and the crankshaft 26 of the generator 29 rotate. Thus, the crankshaft 26
Is driven to rotate, the engine 13 starts.

The starting device 21 is used for the motorcycle 1
Is mounted on the engine 13 as shown in FIGS. 1 to 4 when the race specification is not used, and is removed from the engine 13 when the race specification is used. The operation of attaching and detaching the starting device 21 to and from the engine 13 is performed by the engine 13.
Is carried out while being mounted on the vehicle body. To remove the starting device 21 from the engine 13, first, the gear cover 28 is removed from the crankcase cover 31, and the first gear 23, the second gear 24, and the starter gear 25 are removed. At this time, the starter gear 25 is connected to the inner race 27 of the one-way clutch 27.
a together with the outer ring 27b.

The outer ring 27b of the one-way clutch 27
Is removed from the generator 29 together with the roller 27c. After the reduction gear group, the starter gear 25, the one-way clutch 27, and the like are removed from the engine 13, the crankcase cover 31 is removed from the crankcase 14, and the starter motor 22 is removed from the crankcase cover 31. After the starter motor 22 is removed, the crankcase cover 31 is attached to the crankcase 14 again. In this way, the entire starting device 21 is removed from the engine 13.

Next, the opening of the crankcase cover 31 is closed. At this time, the previously removed gear cover 28 may be attached to the crankcase cover 31. However, in order to reduce the weight, a substantially flat gear cover (not provided with the shaft fitting hole, the boss 28a, etc.) is used. (Not shown).

In order to change the race type to the public road running type, the starting device 21 is mounted in a procedure reverse to the above-described procedure. That is, first, the flat cover and the crankcase cover 31 are removed from the crankcase 14, and the starter motor 22 is attached to the crankcase cover 31. Then, after attaching the crankcase cover 31 to the crankcase 14 again, the one-way clutch 27 and the starter gear 25 are attached to the generator 29, and the first gear 23 and the second gear 24 are attached to the crankcase cover 31. Finally, the gear cover 28
Install.

Therefore, according to the present invention, the starting device 21
Will be externally attached to the crankcase 14,
In mounting a motor-type starter on a conventional racing engine, it is only necessary to add a starter mounting portion to the crankcase. Also, in this engine 13,
In retrofitting a race-dedicated vehicle for driving on a public road with a motor-type starter, a starter gear 25 is first attached to a rotor 30 of a generator 29 via a one-way clutch 27, and then a first gear 23 and a second gear 24, and finally the gear cover 28. That is, since the starter gear 25 can be assembled to the rotor 30 before the inside is closed by the gear cover 28, the one-way clutch 27 assembled at the same time as the assembly of the starter gear 25 is operated to check the operation. It can be carried out. Furthermore, in the remodeling work, first, one end of the crankcase cover 31 is attached to the opening of the crankcase 14. At this time, the crankcase cover 31 is attached only to the starter motor 22 and the other gears (the The first gear 23 and the second gear 24) can be in a state where they are not attached. For this reason, the mounting work of the crankcase cover 31 can be easily performed.
The starter gear 25 and the reduction gear group can be easily mounted from the opening at the other end of the crankcase cover 31, and the reduction gear group is temporarily attached to each gear (the first gear 23 and the second gear 24) only on the crankcase cover 31. Can be supported.
For this reason, the gear cover 28 is
When the connection with the other end is performed, the operation involves fitting the support shafts 32, 33 of the reduction gear group into the shaft holes 28c, 28d, and fitting the starter gear 25 into the boss 28a. However, since the gear cover 28 has no starting component and is light in weight, the mounting work of the gear cover 28 becomes easy.

[0031]

Further, in this embodiment, the ball bearing 34 is used as a bearing for supporting the starter gear 25, but a needle roller bearing may be used as shown in FIG. FIG. 5 is a cross-sectional view showing another embodiment of the starting device. In FIG. 5, the same or equivalent members as those described in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 5, reference numeral 41 denotes a needle roller bearing which rotatably supports the starter gear 25. The needle roller bearing 41 is interposed between the boss 28 a on the gear cover 28 side and the inner ring 27 a of the one-way clutch 27. The boss 28a is formed on an auxiliary cover 41 formed separately from the gear cover 28 and screwed to the gear cover 28 from outside the case.

As described above, the boss portion 28a is
The starter gear 25 and the one-way clutch 27 are attached to the generator 29 while the needle roller bearing 41 is formed on the inner ring 27a.
When the reduction gear group is subsequently attached to the crankcase cover 31, the needle roller bearing 41 is attached to the inner ring 2.
This is because it is easy to fall from 7a. That is, the reduction gear group is attached and the gear cover 28 is attached to the crankcase cover 31.
After the needle roller bearing 41 is attached to the inner ring 27a after the attachment, and the auxiliary cover 42 is immediately attached to the gear cover 28, the boss portion 28a can be fitted without the needle roller bearing 41 falling off.

Even if the needle roller bearing 41 is used as shown in FIG. 5, the same effect as in the above embodiment can be obtained.

[0036]

As described above, in the motorcycle engine according to the present invention, the generator housing space is formed on the side of the crankcase by the crankcase and the lid, and the rotor mounted on the shaft end of the crankshaft is provided. In a motorcycle engine in which a generator having a generator is accommodated in the generator accommodating space and a motor-type starting device is provided in the lid, the lid is formed so as to open outward in the vehicle width direction. A crankcase cover having one end in the direction attached to the crankcase, and a gear cover closing the opening of the crankcase cover, and a gear case extending from the generator housing space to both covers in a direction orthogonal to the vehicle width direction. The starter motor is attached to the gear case forming part of the crankcase cover, and the starter motor With the power gear facing the gear case, a starter gear is attached to the outer end of the rotor via a one-way clutch, and the output gear and the starter gear are connected via a reduction gear group housed in the gear case. The shaft of each gear of this reduction gear group is rotatably and detachably fitted into a shaft hole formed in the gear case forming portion of the crankcase cover and a shaft hole formed in the gear case forming portion of the gear cover. Since the meshing portion of each of the gears is positioned outside the starter gear in the vehicle width direction, the complete motor-type starter is attached to the lid and externally attached to the crankcase.
By simply replacing the lid with a starter of a vehicle for public road driving with a lid without a starter, it can be retrofitted into a lightweight race-specific vehicle without greatly changing the structure of the engine.

Further, in the motorcycle engine according to the present invention, when the race exclusive vehicle is refurbished for running on a public road with a motor type starting device, first, a starter gear is firstly connected to a generator rotor via a one-way clutch. Installation is carried out, after that, a reduction gear group is attached, and finally, a gear cover is attached. That is, since the starter gear can be assembled to the rotor before the inside is closed by the gear cover, the one-way clutch assembled at the same time when the starter gear is assembled can be operated to check the operation.

Further, in the remodeling work, first, one end of the crankcase cover is attached to the opening of the crankcase. At this time, only the starter motor is attached to the crankcase cover. It can be in a non-attached state. For this reason, the mounting work of the crankcase cover can be easily performed. The starter gear and the reduction gear group can be easily mounted from the opening at the other end of the crankcase cover, and the reduction gear group can temporarily support each gear only on the crankcase cover. For this reason, when connecting the gear cover to the other end of the crankcase cover, the operation of fitting the support shaft of the reduction gear group to the shaft hole and the operation of fitting the starter gear to the boss portion are involved. However, since the gear cover has no starting device components and is light in weight, the mounting work of the gear cover becomes easy. More specifically, since the gear cover can be held accurately by hand, the mounting operation is simple, and the remodeling operation can be performed without any skill.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle equipped with an engine according to the present invention.

FIG. 2 is a side view of the motorcycle engine according to the present invention.

FIG. 3 is a front view of the motorcycle engine according to the present invention.

FIG. 4 is a sectional view taken along line IV-IV of a main part in FIG. 2;

FIG. 5 is a sectional view showing another embodiment of the starting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Engine 14 Crankcase 21 Starter 22 Starter motor 23 1st gear 24 2nd gear 25 Starter gear 26 Crankshaft 27 One-way clutch 28 Gear cover 28a Boss part 29 Generator 30 Rotor 31 Crankcase cover 34 Ball bearing 41 Needle roller bearing 42 Auxiliary cover

Claims (1)

(57) [Claims] The invention is characterized by the fact that the crankcase and the lid form a general
Data storage space on the side of the crankcase,
A generator having a rotor attached to the shaft end of the shaft;
It is housed in the generator housing space, and the lid is motor-driven
In the motorcycle engine provided with the device, the lid
Is formed so as to open outward in the vehicle width direction.
Crank case with one end in the width direction attached to the crankcase
Cover and the opening of this crankcase cover
Gear cover, and both covers
From the generator storage space to the direction orthogonal to the vehicle width direction
Forming an extended gear case,
Attach a starter motor to the
When the output gear of the motor motor faces the gear case,
In addition, the outer end of the rotor is
The output gear and the starter gear.
Are connected via a reduction gear group housed in the gear case.
The support shaft of each gear of this reduction gear group is a crankcase.
The shaft hole formed in the gear case forming part of the cover and the gear
The shaft hole formed in the gear case forming part of the cover.
The gears are rotatably and detachably fitted to each other,
Positioning the joint part outside the starter gear in the vehicle width direction
A motorcycle engine characterized in that