JPH04255530A - Engine of motor cycle - Google Patents

Abstract

PURPOSE:To miniaturize an engine as a whole by bringing a starter motor close to the center of the horizontal direction of the engine. CONSTITUTION:A starter driven gear 51 is mounted around the drive shaft 37 of a generator in a generator driving system, and a starter motor is arranged on a crank case bidsed in the horizontal direction of the engine. The starter drive gear 50 of the starter motor is engaged with one of a pair of starter idle gears 47, and the starter idle gear 47 engagad with the starter drive gear is arranged in a position opposite to the starter motor in relation to the center in the horizontal direction of a stream engine.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle engine in which a starter system including a starter motor that starts the engine using a part of a generator drive system is disposed in the engine's crankcase.

0003

[Prior Art] Engine units mounted in the center of the motorcycle body often have a crankcase extending rearward connected to the bottom of a vertical cylinder.
A power transmission system that outputs power from the crankshaft via a countershaft and a driveshaft is housed within the crankcase. Further, in a large engine, a generator drive system and a starter system including a starter motor are arranged in the crankcase.

FIG. 3 is a partial sectional view showing a conventional motorcycle engine in which a generator drive system and a starter system using a starter motor are arranged.

The generator drive system that drives the generator 1 transmits the driving force of a crankshaft (not shown) to the generator driven gear 4 via the primary driven gear 2 and the generator drive gear 3, and further transmits the driving force from the crankshaft (not shown) to the generator driven gear 4. , through the damper 6 and the driven disk 7 to the generator drive shaft 8, and rotates the generator 1 connected to the generator drive shaft 8.

[0006] Furthermore, the starter system using the starter motor 9 rotatably transmits the rotational driving force of the starter drive gear 10 to the generator drive shaft 8 via the starter idle gear (large diameter) 11 and starter idle gear (small diameter) 12. The signal is transmitted to the starter driven gear 13 which is loosely fitted to the starter driven gear 13. This starter driven gear 13 is connected to the driven disk 7 via a wedge roller 14 and a ring 15 that constitute a one-way clutch, so the rotational driving force transmitted from the starter motor 9 to the starter driven gear 13 is The signal is transmitted to the crankshaft through the roller 14, driven disk 7, damper 6, drive disk 5, generator driven gear 4, generator drive gear 3, and primary driven gear 2 in this order, and the engine is started.

[0007] After the engine is started, the aforementioned generator drive system operates, but the starter system up to starter idle gears 11 and 12 and starter drive gear 10 is disconnected by the action of the one-way clutch. Further, starter idle gears 11 and 12 are coupled together and supported by a starter idle shaft 16. Furthermore, the reference numeral 17 in the figure indicates a countershaft.

[0008]

However, in the starter system using the starter motor as described above, the starter driven gear 13, the starter idle gears 11 and 12, and the starter drive gear 10 are oriented in the same direction in the horizontal direction of the engine. Since the starter motor 9 is arranged in this direction (to the left), the starter motor 9 protrudes significantly in this direction, that is, to the left with respect to the horizontal center line 18 of the engine. Therefore, there is a risk that the engine as a whole will become larger.

The present invention has been made in consideration of the above-mentioned circumstances, and provides a motorcycle engine in which the starter motor disposed in the crankcase is brought closer to the horizontal center of the engine, thereby making the engine smaller as a whole. The purpose is to provide. [Structure of the invention]

0010

[Means for Solving the Problems] The present invention has a generator drive system disposed in the crankcase, and a starter system including a starter motor that starts the engine using some of the components of the generator drive system. In a motorcycle engine, a starter driven gear is mounted on a generator drive shaft of the generator drive system, and the starter motor is disposed in the crankcase with a bias toward the horizontal direction of the engine, and the starter motor The starter drive gear meshes with one of a set of starter idle gears, the other starter idle gear meshes with the starter driven gear, and the starter idle gear meshed with the starter drive gear is aligned with the horizontal center of the engine. On the other hand, it is characterized in that it is arranged at a position opposite to the starter motor.

[0011]

[Operation] Therefore, according to the motorcycle engine of the present invention, the starter idle gear that meshes with the starter drive gear of the starter motor is arranged at a position opposite to the starter motor with respect to the horizontal center of the engine. can be moved closer to the horizontal center of the engine. As a result, the amount by which the starter motor projects in the horizontal direction of the engine relative to the crankcase can be reduced, making it possible to downsize the engine as a whole and centralizing the weight of the engine.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the engine for a two-wheeled motor vehicle according to the present invention, and FIG.
It is a sectional view along the -II line.

Reference numeral 21 shown in FIG. 1 indicates a crankcase, and the lower end of a vertical cylinder 23 is connected to the front upper end surface 22 (the front is indicated by an arrow) of the crankcase 21.
It is formed in a shape that bulges backwards.

This crankcase 21 has a horizontal center dividing surface 24 passing approximately at the center of its vertical width, and a similarly horizontal upper dividing surface 25 located above the horizontal central dividing surface 24. It is sequentially divided into a half case element 21B and an upper case case element 21C. These upper half, lower half, and upper split case elements 21A, 21B, and 21C are joined by tightening bolts 26 and assembled as a crankcase 21.

Inside the crankcase 21, there is a central dividing surface 2.
A crankshaft 27, a countershaft 28, and a driveshaft 29 whose axes coincide with each other are mounted in parallel from the front. As shown in FIG. 2, a crankshaft 27, a countershaft 28, and a drive shaft 29 (not shown in FIG. 2) are supported by a crankshaft bearing 30, a countershaft bearing 31, and a driveshaft bearing (not shown), respectively. These bearings are divided into upper and lower half case elements 21A.
and 21B from above and below, and is supported by the central dividing surface 24.

The crankshaft 27 has a primary drive gear 33 on one of its crank webs 32A.
is formed. This primary drive gear 33 meshes with a primary driven gear 34 rotatably supported by the counter shaft 28. An opening/closing clutch 35 and a drive gear 36 are mounted on the counter shaft 28, and the primary driven gear 34 is connected to the opening/closing clutch 3.
5 to the countershaft 28. The drive gear 36 mounted on the countershaft 28 meshes with a drive gear (not shown) mounted on the drive shaft 29 (FIG. 1) to constitute a transmission gear mechanism.

The above-mentioned primary drive gear 33, primary driven gear 34, opening/closing clutch 35, and transmission gear mechanism are engine power transmission systems that transmit the rotation of the crankshaft 27 driven by the vertical movement of the piston to the drive shaft 29 in a variable speed manner. A drive sprocket gear (not shown) fixed to a drive shaft 29 drives a rear wheel (both not shown) via a drive chain.

Next, a generator drive shaft 37 and a starter idle shaft 38 are mounted on the upper divided surface 25 shown in FIG. 1, surrounded by the upper half divided case element 21B and the upper divided case element 21C. . These generator drive shaft 37 and starter idle shaft 38 have their axes aligned with the upper dividing surface 25,
and is arranged parallel to the countershaft 28. Furthermore, the generator drive shaft 37 is pivotally supported by generator drive shaft bearings 39A and 39B shown in FIG.

The generator drive shaft 37 has a drive disk 40 that is rotatable with respect to the generator drive shaft 37, and a driven disk 41 that is spline-coupled to the generator drive shaft 37 so as to rotate integrally with the generator drive shaft 37. equipped. These drive disk 40 and driven disk 41 are connected by a damper 42 to constitute a damper device. Of these, the drive disk 40 is provided with an axial alignment boss 40A, and this axial alignment boss 4
0A extends to one end of the generator drive shaft 37 and is pivotally supported by one generator drive shaft bearing 39B, thereby indirectly supporting the generator drive shaft 37.

A generator driven gear 43 is rotatably spline-coupled to the shaft alignment boss 40A, and meshes with a generator drive gear 44 integrally coupled to the primary driven gear 34 to transmit rotation. On the other hand, the other end of the generator drive shaft 37 is connected to the crankcase 2.
The input shaft 46 of the generator 45 attached to the top surface 54 of 1
is combined with The rotation transmitted from the generator drive gear 44 to the generator driven gear 43 is transmitted through damper devices (drive disk 40, driven disk 41, damper 42).
The signal is transmitted to the generator drive shaft 37 via the generator drive shaft 37, and the generator 45 is driven. The generator drive gear 44, generator driven gear 43, damper device, and generator drive shaft 37 constitute a generator drive system.

[0022] A starter system using a starter motor is incorporated into this generator drive system using some of its components. That is, the starter idle shaft 3
8, large-diameter and small-diameter starter idle gears 47 and 48, which are integrally coupled, are rotatably supported. The large diameter starter idle gear 47 meshes with the starter drive gear 50 of the starter motor 49, and the small diameter starter idle gear 48 meshes with the generator drive shaft 37.
It meshes with a starter driven gear 51 rotatably supported above.

The starter driven gear 51 includes an alignment boss portion 51A, and a wedge roller 53 is interposed between the alignment boss portion 51A and a ring 52 coupled to the driven disk 41. A one-way clutch is configured. By the way, the starter motor 49 is attached to the upper surface 54 of the crankcase 21 along with the generator 45, and only the output shaft forming the starter drive gear 50 protrudes into the crankcase 21.

When the starter motor 49 is driven, the starter driven gear 51 is rotated via the starter idle gears 47 and 48, and in this case, the one-way clutch is activated, and the generator is rotated via the damper device (40, 41, 42). The driven gear 43 rotates. The rotation of the generator driven gear 43 is transmitted to the crankshaft 27 via the generator drive gear 44, the primary driven gear 34, and the primary drive gear 33, and the crankshaft 27 is driven to start the engine. After the engine is started, the generator drive system operates, but the one-way clutch disconnects the starter system up to the starter idle gears 47 and 48 and the starter motor 49.

As described above, in the starter motor 49, only the output shaft on which the starter drive gear 50 is formed protrudes into the crankcase 21, and most of the other parts are offset with respect to the horizontal center line 55 of the engine. position (on the left side of the vehicle). Further, the starter idle gear (large diameter) 47 that meshes with the starter drive gear 50 is separated from the starter idle gear (small diameter) 48 along the axial direction of the starter idle shaft 38, and the driven A portion of the disk 41 and the ring 52 are positioned therein. In other words,
The starter idle gear 47 is set at a position opposite to the starter motor 49 with respect to the horizontal centerline 55 of the engine.

Since the starter idle gear (large diameter) 47 that meshes with the starter drive gear 50 is disposed at a position opposite to the starter motor 49 with respect to the horizontal center line 55 of the engine, the starter motor 49 is It can be moved closer to the horizontal centerline 55 of the engine. As a result, the starter motor 49 is connected to the crankcase 2.
Since the amount of horizontal protrusion of the engine can be reduced compared to 1, the engine can be made smaller as a whole.

Furthermore, since the starter motor 49 is heavy, if the starter motor 49 can be moved closer to the horizontal center line 55 of the engine as described above, the center of gravity of the engine can be moved closer to the horizontal center line 55 of the engine. You will be able to do that. As a result, the handling stability performance of a motorcycle equipped with this engine can also be improved.

[0028]

As described above, according to the motorcycle engine according to the present invention, the starter driven gear is mounted on the generator drive shaft of the generator drive system, and the starter motor is offset in the horizontal direction of the engine. The starter motor is disposed in the crankcase, and the starter drive gear of the starter motor meshes with one of a set of starter idle gears, the other starter idle gear meshes with the starter driven gear, and the starter drive gear meshes with the starter drive gear. Since the starter idle gear is disposed at a position opposite to the starter motor with respect to the horizontal center of the engine, the starter motor disposed in the crankcase can be brought closer to the horizontal center line of the engine, and as a result, The engine as a whole can be made smaller.

[Brief explanation of the drawing]

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

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a partial sectional view showing a conventional motorcycle engine in which a generator drive system and a starter system using a starter motor are arranged.

[Explanation of symbols]

21 Crankcase 23 Cylinder 37 Generator drive shaft 38 Starter idle shaft 45 Generator 47 Starter idle gear (large diameter) 48 Starter idle gear (small diameter) 49 Starter motor 50 Starter drive gear 51 Starter driven gear 55 Horizontal center line of the engine

Claims (1)

[Claims] Claim 1. A motorcycle engine in which a generator drive system and a starter system using a starter motor that starts the engine using a part of the components of the generator drive system are disposed in the crankcase. A starter driven gear is mounted on the generator drive shaft of the generator drive system, and the starter motor is disposed in the crankcase with a bias in the horizontal direction of the engine, and the starter drive gear of the starter motor is arranged in one set. The starter idle gear meshes with one of the starter idle gears, the other starter idle gear meshes with the starter driven gear, and the starter idle gear meshes with the starter drive gear, which is opposite to the starter motor with respect to the horizontal center of the engine. A motorcycle engine characterized by being located at a certain position.