JP3232379B2 - V-type two-cycle engine for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-type motorcycle 2 in which cylinders sharing a horizontal crankshaft are arranged in a V-shape.
It concerns the cycle engine.

[0002]

2. Description of the Related Art As is well known, in a V-type two-stroke engine of a motorcycle, a horizontal crankshaft is supported by a crankcase, and each cylinder sharing the horizontal crankshaft is rotated around the crankshaft. Some cylinders are arranged in a V-shape, and each of the cylinders arranged in a V-shape is mounted toward the front of the vehicle body.

[0003]

As described above, the V-type two-stroke engine mounted on the motorcycle includes a kick type in which a pedal is stepped down as a starter or a cell motor using a battery. The formula may limit the engine mount at the kick shaft. On the other hand, the use of a cell motor that uses a battery is advantageous in terms of engine mounting, but in this case, care must be taken not to increase the size of the engine due to the cell motor, and the cell motor may interfere with the muffler, When a cell motor is used as the starter of a V-type two-cycle engine mounted on a motorcycle, such as to be not affected by heat from the cylinders and cylinders, and to be placed in a position where no obstacles such as pebbles abut, There is a problem.

The present invention has been made in view of such circumstances, and has as its object to provide a V-type two-stroke engine for a motorcycle in which a cell motor is arranged at an optimum position without increasing the size of the engine. .

[0005]

According to a first aspect of the present invention, a horizontal crankshaft is supported on a rank case, and each of the cylinders sharing the horizontal crankshaft is connected to the crankcase. In a V-type two-cycle engine of a motorcycle in which each cylinder arranged in a V-shape is arranged around an axis and each of the cylinders arranged in the V-shape is directed toward the front side of the vehicle body, a cell motor is arranged within the engine width, and this cell motor is mounted. It is characterized in that it is attached to the crankcase side in the vicinity of the cylinder located on the upper side.

According to a second aspect of the present invention, a horizontal crankshaft is supported on a crankcase, and each cylinder sharing the horizontal crankshaft is arranged in a V-shape around the crankshaft. Each cylinder arranged in is mounted facing the front of the vehicle body,
In a V-type two-cycle engine of a motorcycle in which the muffler of each cylinder extends rearward below the engine,
A starter motor is arranged within an engine width, and the starter motor is attached to a lower portion of the crankcase inside the muffler of the cylinder located on the upper side and above a horizontally extending portion of the muffler. .

[0007]

According to the first aspect of the invention, the starter is disposed within the width of the engine, and the arrangement of the starter does not increase the size of the engine. In addition, since it is attached to the crankcase side near the cylinder located on the upper side, the cell motor does not interfere with the muffler, and the influence of heat from the muffler and the cylinder is reduced, and pebbles flying during traveling And other obstacles are prevented from contacting.

According to the second aspect of the present invention, the starter is disposed within the width of the engine, and the arrangement of the starter does not increase the size of the engine. Further, the starter motor is attached to the lower part of the crankcase inside the muffler of the cylinder located on the upper side and above the horizontally extending portion of the muffler, and is located at a position away from each cylinder. There are no restrictions on passages and cooling water passages. Also, the muffler of each cylinder extends rearward below the engine,
The cell motor is arranged by utilizing the space between the lower part of the engine and the muffler, the cell motor does not interfere with the muffler, and the cell motor is protected by the muffler from obstacles such as pebbles scattered during traveling, and the obstacle is reduced by the cell motor. Is prevented from coming into contact with.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a side view of a motorcycle equipped with a V-type two-stroke engine of the present invention, FIG. 2 is a left side view of the V-type two-stroke engine, FIG. 3 is a front view of the V-type two-stroke engine, and FIG. It is sectional drawing which shows an attachment state.

In FIG. 1, reference numeral 1 denotes a body frame, and a front fork 3 is pivotably supported on a head pipe 2 constituting the body frame 1. A front wheel 4 is provided at a lower portion of the front fork 3, and a handle 5 is provided at an upper portion.

The head pipe 2 is connected to a pair of left and right main frames 6 extending rearward.
Rear arm brackets 7 are welded to the rear portions, respectively. A seat rail 9 is welded to the cross pipe 8 provided above the pair of left and right rear arm brackets 7, and a back stay 10 is provided between the seat rail 9 and the rear arm bracket 7.

A fuel tank 11 is mounted on the main frame 6, above the rear arm bracket 7, and further on the front side of the seat rail 9, and a seat 12 is mounted on the seat rail 9 behind the fuel tank 11. . A rear arm 14 on which a rear wheel 13 is suspended is mounted on the rear arm bracket 7.
Is supported via a pivot shaft 15, and the rear arm 1
4 is swingable by a suspension device 16 provided between the cross pipe 8 and the rear arm 14.

A V-type two-cycle engine 17 is mounted on the main frame 6 and the rear arm bracket 7. A radiator 18 is arranged above the front side of the V-type two-cycle engine 17, and the V-type two-cycle engine 17 is of a water-cooled type. The V-type two-stroke engine 17 has a front upper portion supported by a central portion of the main frame 6 via a bracket 19, and a rear upper portion provided by a bracket 21 to a cross pipe 20 provided at a central portion of the rear arm bracket 7. The rear lower part is supported by a cross pipe 22 provided below the rear arm bracket 7 via a bracket 23.

In the V-type two-cycle engine 17, a horizontal crankshaft 25 pivotally supported by a crankcase 24 is disposed in the left-right direction of the vehicle, and a first cylinder 26 and a second cylinder 26 which share the horizontal crankshaft 25. The cylinders 27 are arranged in a V shape around the crankshaft, and the cylinders 26 and 27 arranged in the V shape are mounted toward the front of the vehicle body.
The first cylinder 26 is located on the lower side, and the second cylinder 27 is located on the upper side. The first cylinder 26 and the second cylinder 27 are offset by a predetermined interval L in the axial direction of the horizontal crankshaft 25. I have. Due to this offset, a space is formed on the front side of the second cylinder 27, that is, on the left side of the first cylinder 26,
Similarly, a space is formed behind the first cylinder 26, that is, on the right side of the second cylinder 27.

A carburetor 28 is connected to the rear side of the first cylinder 26, and a muffler 29 is connected to the front side. The muffler 29 extends right below the engine and extends rearward of the vehicle body.
A carburetor 30 is connected to the rear of the second cylinder 27, and a muffler 31 is connected to the front side. The muffler 31 passes through a space formed on the left side of the first cylinder 26, passes on the lower left side of the engine, and Extending backwards.

Each of the cylinders 26 and 27 is a crankcase 2
The cylinder blocks 32, 33 are connected to the cylinder head 4 and cylinder heads 34, 35 mounted on the cylinder blocks 32, 33. The cylinder heads 34, 35 are provided with spark plugs 36, 37, respectively.

A starter motor 38 is arranged near the front side of the second cylinder 27 located above and within the engine width. The starter motor 38 is connected to a line L1 on the mating surface between the cylinder block 32 of the first cylinder 26 and the crankcase 24.
And the line L2 on the mating surface of the cylinder block 33 and the crankcase 24 of the second cylinder 27 intersects each other.

In this embodiment, the starter motor 38 is entirely formed by a line L1 between the cylinder block 32 of the first cylinder 26 and the crankcase 24 and a line L1 between the cylinder block 33 of the second cylinder 27 and the crankcase 24. Although positioned inside the line L2 intersects, even if the axis of the starter motor 38 is set to the inside where the mating line L1 and the mating line L2 intersect, and most of the starter motor 38 is arranged inside, Good.

As described above, the starter motor 38 is attached to the upper surface of the crankcase 24 by the bolt 39 near the front side of the second cylinder 27 located on the upper side.
8, water passages 40, 41 for circulating cooling water from the crankcase 24 to the cylinder blocks 32, 33
Are formed separately.

The output shaft 42 of the starter motor 38 protrudes from the side of the crankcase 24, and passes through an idle gear 43 which is supported by the crankcase 24.
It is connected to the. The one-way clutch 44 is provided on the horizontal crankshaft 25, and a generator 45 is provided at an end of the horizontal crankshaft 25.

When the starter motor 38 is driven, power is transmitted to the one-way clutch 44 via the idle gear 43.
When the engine is started by forcibly rotating the horizontal crankshaft 25 and the engine is started, the connection with the starter motor is cut off by the one-way clutch 44. The output shaft 42 of the starter motor 38, the idle gear 43, and the generator 45 provided on the horizontal crankshaft 25 are covered with a crankcase cover 46.

As described above, since the starter motor 38 is disposed within the width of the engine, the size of the engine is not increased by the starter motor 38, and the starter motor 38 is disposed near the second cylinder 27 located on the upper side. Since the line L1 at the intersection between the cylinder block 32 of the cylinder 26 and the crankcase 24 and the line L2 at the intersection between the cylinder block 33 of the second cylinder 27 and the crankcase 24 intersect, the cell motor 38 Can be reduced from interfering with the muffler 31 or being affected by the heat of the muffler 31. In addition, the second cylinder 27 is attached to the crankcase 24 in the vicinity of the second cylinder 27 located on the upper side.
Because of the reduced influence of the heat and the high position, it is possible to prevent obstacles such as pebbles from abutting during traveling.

5 to 7 show another embodiment of the V-type two-stroke engine of the motorcycle, FIG. 5 is a right side view of the V-type two-stroke engine, FIG. 6 is a plan view of the V-type two-stroke engine, FIG. 7 is a cross-sectional view showing a mounting state of the starter motor.

In this embodiment, the starter motor 50 is located on the right side of the second cylinder 27 located on the upper side, in the space above and behind the first cylinder 26 located on the lower side, and the second cylinder located on the upper side. A starter motor 50 is arranged near 27 and within the engine width. The starter motor 50 is attached to the crankcase 24 and the crankcase cover 51,
The output shaft 52 of the starter motor 50 is connected to the crankcase cover 5.
1 is connected to a one-way clutch 54 via an idle gear 53, and the one-way clutch 54 is provided on the horizontal crankshaft 25. The output gear 55 provided at the tip of the horizontal crankshaft 25 is a main shaft 56.
Meshes with a reduction gear 57 movably provided on the main shaft 56.
The centrifugal clutch 58 connects and disconnects power to the main shaft 56. The output gear 55 from the centrifugal clutch 58 is covered with a clutch cover 59, and the output shaft 52 of the starter motor 50 is covered with a cap 60 that supports the idle gear 53.

As described above, since the starter motor 50 is arranged within the width of the engine, the size of the engine is not increased by the starter motor 50, and the starter motor 50 is arranged near the second cylinder 27 located on the upper side, and located on the lower side. The crankcase 2 is located in the space above and behind the first cylinder 26
Since it is attached to the fourth side, the starter 50 does not interfere with the muffler 29 and is not affected by heat from the muffler 29 or the cylinder. In addition, the second
Since it is arranged near the cylinder 27 and is at a high position, it is possible to prevent obstacles such as pebbles from abutting during traveling.

In the above embodiment, the starter motor 3
8 and 50 are attached to the crankcase 24, but may be attached to the crankcase cover 46, the clutch cover 59 and the like attached to the crankcase 24.

8 and 9 show another embodiment of the V-type two-stroke engine of the motorcycle. FIG. 8 is a left side view of the V-type two-stroke engine, and FIG. 9 is a front view of the V-type two-stroke engine. is there.

In this embodiment, the V-type two-cycle engine 17 has the same configuration as the V-type two-cycle engine shown in FIGS. In this embodiment, as shown in FIGS. 2 and 3, a horizontal crankshaft 25 is supported by a crankcase 24, and a lower first cylinder 26 sharing the horizontal crankshaft 25. And the second cylinder 27 located on the upper side is arranged in a V-shape around the crankshaft, and the first cylinder 26 and the second cylinder 27 arranged in the V-shape are mounted toward the front side of the vehicle body. . The muffler 29 of the first cylinder 26 extends rearward below the engine, and the muffler 31 of the second cylinder 27 extends forward to the position of the head of the first cylinder 26, and bends rearward below the engine. Extending.

The starter motor 70 is arranged within the width of the engine, and the starter motor 70 is arranged in the second cylinder 27 located on the upper side.
Inside the muffler 31 and above the horizontally extending portion of the muffler 31 and beside the muffler 29 of the first cylinder 26 located further below the muffler 31 and attached to the crankcase side. The output shaft 71 of the starter motor 70 is connected to a one-way clutch 73 via an idle gear 72, and the one-way clutch 73 is provided on the horizontal crankshaft 25.

As described above, the starter motor 7 is set within the engine width.
0 is arranged, and the size of the engine is not increased by the arrangement of the starter motor 70.

The starter motor 70 is located inside the muffler 31 of the second cylinder 27 located on the upper side, and
Above the horizontal extension of the first
The self-motor 70 is attached to the side of the muffler 29 of the cylinder 26 on the crankcase side.
The first cylinder 26 and the second cylinder
The scavenging passage and the cooling water passage of the cylinder 27 are not restricted by the arrangement of the starter motor 70.

The mufflers 29, 31 of the first cylinder 26 and the second cylinder 27 extend rearward below the engine, and a cell motor 70 is disposed by utilizing the space between the lower part of the engine and the mufflers 29, 31. Have been. Accordingly, the cell motor 70 does not interfere with the mufflers 29 and 31, and the cell motor 70 is protected by the mufflers 29 and 31 from obstacles such as pebbles scattered at the time of traveling, thereby preventing the obstacles from contacting the cell motor 70.

[0033]

As described above, according to the first aspect of the present invention, since the starter is disposed within the width of the engine, the arrangement of the starter does not increase the size of the engine.
In addition, since the starter motor is disposed near the cylinder located on the upper side and attached to the crankcase side, the starter motor does not interfere with the muffler, and is less affected by heat from the muffler and the cylinder, and scatters during traveling. An obstacle such as a pebble is prevented from abutting.

The invention according to claim 2 is attached to the lower part of the crankcase at a position inside the muffler of the cylinder on which the starter motor is located and above the horizontally extending part of the muffler, and is separated from each cylinder. Position, there is no restriction on the scavenging passage and cooling water passage of the cylinder. In addition, the cell motor is disposed by utilizing a space between the lower part of the engine and the muffler. Contact with the starter is prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle equipped with a V-type two-stroke engine of the present invention.

FIG. 2 is a left side view of the V-type two-stroke engine.

FIG. 3 is a front view of a V-type two-stroke engine.

FIG. 4 is a sectional view showing an attachment state of a starter motor.

FIG. 5 is a right side view of the V-type two-stroke engine.

FIG. 6 is a plan view of a V-type two-stroke engine.

FIG. 7 is a cross-sectional view showing a mounting state of a starter motor.

FIG. 8 is a left side view of the V-type two-stroke engine.

FIG. 9 is a front view of a V-type two-stroke engine.

[Explanation of symbols]

 17 V type two-stroke engine 24 Crank case 25 Horizontal crankshaft 26 First cylinder 27 Second cylinder 38, 50, 70 Cell motor

Claims (2)

(57) [Claims] 1. A horizontal crankshaft is supported on a crankcase, and cylinders sharing the horizontal crankshaft are arranged in a V-shape around the crankshaft, and the cylinders arranged in the V-shape are arranged. In a V-type two-stroke engine of a motorcycle mounted with the front facing the vehicle body, a cell motor is arranged within the engine width, and the cell motor is mounted on the crankcase side near the cylinder located on the upper side. V-type two-cycle engine for motorcycles. 2. A horizontal crankshaft is pivotally supported on a crankcase, and each cylinder sharing the horizontal crankshaft is arranged in a V-shape around the crankshaft, and each cylinder arranged in the V-shape is arranged. The V of a motorcycle with the muffler of each cylinder extended rearward below the engine
In the type 2 cycle engine, a cell motor is arranged within the engine width, and the cell motor is attached to the lower part of the crankcase inside the muffler of the cylinder located on the upper side and above the horizontally extending portion of the muffler. A V-type two-stroke engine for a motorcycle.