JPS6058078B2 - Motorcycle power unit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power unit device for a motorcycle that transmits power from a countershaft of a transmission connected to an engine to a final shaft connected to a rear wheel. Maintenance of the transmission part that interlocks and connects the continuous final shaft is easy, and the transmission case that houses the transmission part and the water pump driven by the water-cooled engine are arranged on one side of the power unit case. , we were able to suppress the increase in width as much as possible, and also achieved a reduction in the weight and size of the power unit case itself.
It is an object of the present invention to provide a power unit device for a motorcycle.

In order to achieve such an object, the present invention includes a power generator driven by the engine mounted on one side of a power unit case that integrates the crank case and transmission case of a water-cooled engine mounted on a vehicle body frame. A recess is formed in one side of the power unit case at the rear of the generator, and within the recess, the power unit case includes a transmission part that interlocks and connects a countershaft of a transmission in the case and a final shaft connected to a rear wheel. A transmission case for storing the power unit is removably installed with a gap between the power unit case and the generator, and a water pump supported on one side of the power unit case and driven by the engine is installed in the gap. The water pump is characterized in that a suction pipe and a discharge pipe extending from the water pump are made to detour below the generator and extend in front of the generator. Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, a type multi-cylinder water-cooled engine E is mounted horizontally (with its crankshaft 4 perpendicular to the longitudinal direction of the body frame F) on a double graded body frame F of a motorcycle. The main body of the engine E consists of two engine blocks 1 and 2 arranged in a V-shape with respect to the direction of movement of the motorcycle, and a power unit that is connected to the lower part of these blocks and integrates a crank case and a transmission case. Case 3.

A generator 5 driven by a crankshaft 4 is disposed at the front of one side of the power unit case 3 . Further, a recess 6 that sinks inward is formed on one side of the power unit 3 behind the generator 5, and within the recess 6, a transmission case 17 (described later) is installed on one side of the power unit case 3. It is removably fixed to the generator 5 with a gap S therebetween, and furthermore, within the gap S is a water pump 7 mounted on one side of the power unit case 3 and driven by the crankshaft 4. is installed. A suction vibrator 8 and a discharge vibrator 9 are connected to the suction port and the discharge port of the water pump 7, respectively.
extends forward along the downtube of the
It communicates with the outlet of the radiator 10 provided in the down tube, and the discharge vibe 9 also wraps around the outer periphery of the lower surface of the generator 5, and its open end communicates with the inlet of the cooling water passage formed in the engine blocks 1 and 2. be done. In addition, the outlet of the cooling water passage in the engine blocks 1 and 2 and the radiator 10
Between the entrances is a water guide vibrator. 11, and this water guiding vibe 11 is also placed along the down tube of the vehicle body frame F. When the water pump 7 is driven by the operation of the engine E, the water pump 7 supplies cooling water to the cooling water passages in the engine blocks 1 and 2 and the radiator. The engine blocks 1 and 2 can be cooled by forced circulation within the evaporator 10 as usual.

The transmission housed in the power unit case 3 includes a main shaft 12 that is interlocked with the crankshaft 4, a countershaft 13, and a group of speed change gears that are interlocked between the shafts 12 and 13.

As shown in FIG. 3, the output end of the countershaft 13 projects outward from the power unit case 3, and a drive bevel gear 14 is fixed thereto.

In the recess 6, a transmission case 17 is attached to one side of the power unit case 3 by a plurality of mounting bolts 16, 16, . . . so as to cover the drive bevel gear 14.
is fixed, and the outer surface of the transmission case 17 is located inside the extension line L passing through the outer surface of the generator 5. Further, the driving bevel gear 14 is meshed with a final shaft 18 which is rotatably supported by a transmission case 17, and an integral J driven bevel gear 15, which is connected to the rear wheel Wr via a propeller shaft 19.
linked to. Next, the operation of one embodiment of the present invention will be described. When the engine E is operated, the main shaft 12 that is linked to the crankshaft 4 is rotationally driven, and this rotation is transmitted to the countershaft 13 via a speed change gear mechanism. transmitted to.

The rotation of the countershaft 13 is transmitted to the propeller shaft 19 via the driving and driven bevel gears 14 and 15 in the transmission case 17, and can drive the rear wheels Wr. As described above, according to the present invention, the power generator 5 driven by the engine E is mounted on one side of the power unit case 3 that integrates the crank case and transmission case of the water-cooled engine E mounted on the vehicle body frame F. A recess 6 is formed in one side of the power unit case 3 at the rear of the generator 5, and within the recess 6, the power unit case 3 is fitted with a countershaft 13 of the transmission in the case 3 and a rear part of the power unit case 3. Since the transmission case 17 housing the transmission part that interlocks and connects the final shaft 18 connected to the wheel Wr is removably installed with a gap S between it and the generator 5, one side of the power unit case 3 , due to two points: the power unit case 3 is separate from the transmission case 17, and the gap S exists between the transmission case 17 and the generator 5. The recess 6 can be formed wide, which is advantageous in reducing the weight and size of the power unit case 3 itself.

Moreover, when the transmission case 17 is removed, the transmission section is largely opened to one side of the power unit case 3.
Inspection and maintenance of the transmission section and refueling work can be easily performed from the side of the vehicle without being obstructed by the power unit case 3, improving work efficiency. Moreover, since the transmission section can be housed inward from the outermost end of the power unit case 3, that is, the outer end of the generator 5, the width of the power unit case 3 does not increase due to the presence of the transmission section. This allows the motorcycle to have a sufficient bank angle. Furthermore, since the water pump 7 supported on one side of the power unit case 3 is disposed in the gap S between the generator 5 and the transmission case 17, the gap S, which is originally a dead space, is used as the space for arranging the water pump. In addition, the water pump 7 can be effectively protected from collision with other objects by the generator 5 and the transmission case 17.

Furthermore, the suction vibrator 8 and the discharge vibrator 9 extending from the water pump 7 are bypassed below the generator 5 and extend forward thereof, so that the two vibrators 8 and 9 are attached to the radiator 10 etc. at the front of the vehicle body frame. It is easy to handle the vibrators when connecting them, and moreover, the parts around the generator of both the vibrators 8 and 9 can be effectively protected from collision with other objects. Incidentally, as shown in the above embodiment, the countershaft 1
By providing the direct drive bevel gear 14 in the power unit case 3, the transmission shaft of the transmission arranged horizontally in the power unit case 3 can be made into a two-axis configuration of the main shaft 12 and the counter shaft 13, and The length can also be shortened.

[Brief explanation of drawings]

The drawings show one embodiment of the device of the present invention; FIG. 1 is a side view thereof, FIG. 2 is a plan view of the engine, and FIG.
It is an enlarged cross-sectional view taken along the line shown in FIG.

Claims (1)

[Claims] 1. A generator 5 driven by the engine E is attached to one side of a power unit case 3 that integrates the crank case and transmission case of a water-cooled engine E mounted on a vehicle body frame F. , a recess 6 is formed in one side of the power unit case 3 behind the generator 5, and within the recess 6, the power unit case 3 is provided with a countershaft 13 of the transmission within the case 3.
A transmission case 17 housing a transmission part that interlocks and connects the final shaft 18 connected to the rear wheel Wr is removably installed with a gap S between the generator 5 and the generator 5. A water pump 7 supported on one side of the power unit case 3 and driven by the engine E is disposed, and a suction pipe 8 and a discharge pipe 9 extending from the water pump 7 are connected below the generator 5. It is made to bypass and extend in front of it. Motorcycle power unit equipment.