JPS6241154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a water-cooled motorcycle equipped with a radiator for cooling a power unit.

In conventional water-cooled motorcycles, the radiator is installed in front of the power unit, so in order to strengthen the cooling capacity of the radiator, the area of the ventilation path is widened, thereby reducing the overall air resistance of the vehicle. In addition, there was a problem in that the air cooling effect of the power unit due to the running wind was also reduced.

Therefore, in order to enhance the above-mentioned air cooling effect, for example, as shown in Japanese Utility Model Publication No. 43-14018, an air cooling air intake port is opened at the center of the front of the cowling that encloses the power unit, and at both the left and right sides of the intake port. Although it has been proposed that a radiator is installed in the radiator, this method has the disadvantage that the area of the ventilation path of the radiator is narrowed due to the special provision of the air intake port. In order to eliminate this drawback, if the radiator were made larger while leaving the air intake port as is, the front projected area of the power unit would increase accordingly, which would not only lead to an increase in the air resistance of the entire vehicle. This causes the problem that the vehicle becomes larger in the left and right direction, and if the radiator is made larger by narrowing the air intake port, the intended function of the air intake port cannot be expected. arise.

The present invention has been proposed in view of the above, and has excellent air cooling performance for power units without increasing air resistance or increasing the size of the vehicle in the lateral direction even when using a large radiator with a large ventilation path area. It is an object of the present invention to provide the above-mentioned motorcycle.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a motorcycle M includes a body frame B having a head pipe 1 thereon, a front wheel supported by the head pipe 1 via a steering shaft 2, It consists of a front fork Ff that supports Wf, a power unit P housed inside the vehicle body frame B, and a rear fork Rf that is pivotally connected to the power unit P and supports the rear wheel Wr on both sides at its free end. , their configurations will be sequentially explained next.

First, the vehicle body frame B includes a thin plate cowling 3 whose front end is fixed to the head pipe 1 and extends rearward and downward, and a seat stay 4 with a channel-shaped cross section that is separably connected to the rear end with a screw 5 and covers the upper part of the rear wheel Wr. As shown in FIG. 3, the cowling 3 includes a front plate 3a, left and right side plates 3.
b, 3b, ceiling plate 3c, and bottom plate 3d,
It is formed into a shell with an open rear surface, and has a streamlined shape as a whole. The front plate 3a of this cowling 3 has an air inlet 14, and both side plates 3b, 3
Air outlets 15 are respectively opened at b.

Inside the cowling 3, there is provided an air flow dividing guide plate 45 that smoothly divides the air that has entered the air inlet 14 into the left and right air outlets 15, 15.
b, 3b are connected to each other, which also serves to strengthen the rigidity of the cowling 3.

As clearly shown in FIGS. 4 and 5, a pair of flat plate-shaped radiators R, R extending approximately in the longitudinal direction of the vehicle body are attached to both the left and right air outlets 15, 15 via elastic members 46, 46. Each of these radiators has a pair of upper and lower water tanks 47, 48.
and a plurality of flat water pipes 49, 4 that communicate them.
9..., and the flat side surface of each flat water pipe 49 is inclined outwardly and backwardly of the cowling 3. The upper water tanks 47, 47 of both radiators are connected to the conduit 5.
0 to the cooling water outlet of the power unit P, and the lower water tanks 48 and 48 are connected to the same cooling water inlet through conduits 51, respectively.

Therefore, while the vehicle is running, the synergistic effect of the ram pressure effect acting on the air inlet 14 and the suction effect acting on both air outlets 15, 15, as well as the air flow dividing guide plate 4.
5 generates a large airflow from the inlet 14 to the two outlets 15, 15 (see arrows in Figure 4), and these airflows pass around the flat water pipes 49, 49... of each radiator R. They can be effectively cooled. At that time, flat water pipe 4
9, 49... are inclined as described above and do not obstruct the air flow. In this way, the cooling water cooled by both radiators R, R flows into the lower water tanks 48, 48.
After exiting the water and merging in the conduit 51 and cooling the power unit P, the water is divided into left and right sides by the conduit 50 and returned to the upper water tanks 47, 47, respectively.

Further, as clearly shown in FIG. 3, a horizontal guide rail 6 in the front-rear direction and a plurality of reinforcement/power unit support bosses 7 to 10 are welded to the inner surfaces of the left and right side plates 3b, 3b of the cowling 3. etc., and all of them face the side surface of the power unit P. Of these, the rearmost boss 10 has an occluded circular shape concentric with the output shaft 11 of the power unit P, and the bosses 7 to Bolt holes 7a to 10a are drilled at appropriate locations of 10, and a boss 1 having an occluded circular shape is provided.
A tool window 12 is opened in the center of 0.

The cowling 3 is formed integrally or suitably divided from lightweight materials such as light alloys and synthetic resins, and does not have practical strength by itself. Note that 13 is a patch member bonded to the inner surface of the cowling 3 to reinforce the upper part thereof.

A fuel tank T is installed over the upper part of the cowling 3, and the seat stay 4 extends rearward therefrom.
A seat S, on which the operator D sits astride, is attached to the seat.

The front fork Ff has a telescopic configuration, and is equipped with a steering handle 16 at its upper end and a headlight 17 at its front.

Next is the power unit P, which, as shown in FIG. 7, consists of a crankcase 18,
It has two multi-cylinder cylinder blocks 19 and 20 that protrude in a V-shape from the front of the case, and carburetors 22 and 23 of each block are housed in a V-shaped groove 21 between both blocks 19 and 20.

As shown in FIG. 6, a drive sprocket 25 is fixed to the output shaft 11 that penetrates the left side wall of the crankcase 18 and projects outward, and an adapter 26 that defines a housing h for the drive sprocket 25 is attached. Bolt 2 on the left side of the crankcase 18
It is fixed by 7. Further, an adapter 26' opposite the adapter 26 is fixed to the right side of the crankcase 18 by a bolt 27'. Pivot shafts 28, 28' are removably screwed on, and the left and right proximal ends of the rear fork Rf are pivotally supported on these shafts 28, 28' via bearings 29, 29', respectively.

Additionally, brackets 30, 30 extending rearward are attached to both adapters 26, 26', respectively, with bolts 30, 30 extending rearward.
1 and 31, to which a rod-shaped step 32 is attached (FIGS. 1 and 7).

Furthermore, as shown in Fig. 6, the crankcase 1
Synthetic resin sliding members 33, 33 that can slide on the guide rails 6.6 on the inner surface of the cowling 3 are fixed to both left and right side surfaces of the cowling 3 by bolts 34, 34, respectively.

The rear wheel Wr, which is pivotally supported by the rear end of the rear fork Rf, is equipped with a driven sprocket 35, and a chain 36 is stretched between the driven sprocket 35 and the drive sprocket 25. Therefore, the output of power unit P is
The power is transmitted from the output shaft 11 to the drive sprocket 25, chain 36, and driven sprocket 35 to the rear wheel.
Can drive Wr.

Even if the left leg of the rear fork Rf is slightly deformed due to the tensile force acting on the chain 36 due to the above drive, the bearing of the pivot 28 on the output shaft 11 side is 29, a spherical bearing is particularly used. This ensures smooth vertical swing of the rear fork Rf.

Further, as mentioned above, the output shaft 11 and the pivot shafts 28, 2
8' are coaxially arranged, the distance between the driving and driven sprockets 25 and 35 does not change regardless of the swinging position of the rear fork Rf.
Therefore, the tension of the chain 36 can always be kept constant.

As shown in FIG. 7, the base end of a bifurcated tension link 37 that straddles the rear wheel Wr is pivotally supported 38 in the middle of the left and right legs of the rear fork Rf, and the front end of this link 37 At this position, the base end of the swing link 40 is pivoted 41 at the top of the crankcase 18 so as to be able to swing back and forth, and both links 3
7 and 40 are pivoted 39 to each other at their tips.
A unique shock absorber 44 with a suspension spring is interposed between the swing link 40 and the cylinder block 20, with both ends 42 and 43 being pivoted. In addition, buffer 4
The fixed end, ie, the front end of 4 may be connected to the upper rear end of the cowling 3.

The vertical swing of the rear fork Rf causes the swing link 40 to swing back and forth via the tension link 37, thereby giving the suspension spring-equipped shock absorber 44 an expanding and contracting action.
Therefore, the rear fork Rf is supported by one shock absorber 44 with a suspension spring, and its vertical swing is damped.

In assembling the motorcycle M, the cowling 3 and the power unit P are coupled in the following manner.

That is, first insert the power unit P into the cowling 3 from behind, set the sliding members 33, 33 in place while sliding them along the guide rails 6, 6, and then insert the power unit P into the cowling 3 on both the left and right outer sides. Tightening bolts 55 inserted into bolt holes 7a to 10a
-58, the bosses 7-10 of the side plates 3b, 3b are fixed to the power unit P. In this case, the occluded circular bosses 10, 10 are connected to the adapter 2 of the power unit P.
6 and 26', respectively, and as a result, especially around the pivot shafts 28 and 28' of the rear fork Rf,
power unit P and both side plates 3b of the cowling 3,
3b are firmly fixed. In this way, the power unit P serves as a strength member that firmly connects the side plates 3b, 3b to each other and provides practical strength to the cowling 3.

Furthermore, while driving, as shown in Fig. 1, the driver D places both feet on the steps 32,
At this time, both legs of the driver D are hidden behind the cowling 3, and combined with the streamlined shape of the cowling 3, the air resistance of the vehicle is extremely low.

Next, when the power unit P is connected to the cowling 3 and it is necessary to separate the rear fork Rf from the power unit P for maintenance such as replacing the chain 36 and the driven sprocket 35, it is necessary to All you have to do is insert a tool through the tool windows 12, 12, pull out the pivot shafts 28, 28' from the respective bearings 29, 29', and disconnect the base end of the rear fork Rf from the adapters 26, 26'. Therefore, once the power unit P is connected to the cowling 3, the above-mentioned maintenance work can be performed easily and quickly without having to separate it.

As described above, according to the present invention, a rear wheel drive power unit disposed at an intermediate position between the front and rear wheels is covered with a cowling made of a thin plate, and an air inlet is provided on the front side of the cowling, and an air inlet is provided on the front side of the cowling. Each air outlet is opened, and a power unit cooling radiator that extends approximately in the longitudinal direction of the vehicle body is attached to each air outlet, so it is possible to create a large-capacity vehicle with a wide ventilation duct area without increasing the front projected area of the power unit. It becomes possible to install a radiator, and in combination with the rectifying function of the cowling, the air resistance of the vehicle can be significantly reduced, and it can also contribute to downsizing the vehicle in the left and right direction. Moreover, since the air inlet that opens at the front of the cowling can be made wide without being obstructed by a large-capacity radiator, a portion of the large amount of air introduced into the cowling from the air inlet can be used to power the power unit. can be effectively air cooled.

Further, the radiator is composed of a pair of upper and lower water tanks and a flat water pipe that communicates between the two water tanks, and the flat side surface of the flat water pipe is inclined rearward toward the outside of the cowling. By arranging the radiator substantially parallel to the flow direction of the airflow passing through the air outlet, the flow resistance that the airflow receives from the radiator can be minimized.Therefore, the radiator is arranged approximately in the longitudinal direction of the vehicle body. However, the suction effect of the running wind at the air outlet is sufficiently obtained, and together with the ram pressure effect at the air inlet, a large amount of cooling air can be supplied to the radiator, and as a result, the ventilation is improved as described above. Since the road area is wide and a large capacity radiator can be installed, and the power unit can be effectively air cooled, the cooling performance for the power unit can be significantly improved.

Furthermore, according to the second invention, air outlets are opened on both the left and right sides of the cowling, and a pair of left and right radiators are attached to these, thereby reducing the air resistance of the vehicle while increasing the overall capacity. Not only can the radiator be equipped with a radiator, but also the weight balance of the vehicle in the left and right direction can be measured using both radiators, which is effective in improving the handling stability of the motorcycle.

[Brief explanation of the drawing]

The drawings show an embodiment of the motorcycle of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a partially cutaway front view thereof, and Fig. 3 is a longitudinal sectional side view of the cowling, and Fig. Figure 6 is the same as in Figure 1.
FIG. 7 is a side view of the power unit and rear fork assembly. M...Motorcycle, P...Power unit, R...Radiator, Wf...Front wheel, Wr...Rear wheel, 3...Cowling, 3b...Side plate, 47...Upper water tank, 48...Lower water tank, 49...Flat water pipe.

Claims (1)

[Claims] 1. A rear wheel drive power unit disposed at an intermediate position between the front and rear wheels is covered with a cowling made of thin plate, and an air inlet is provided on the front side of the cowling, and an air outlet is provided on the side thereof. Each opens and its air outlet,
A power unit cooling radiator is installed that extends approximately in the longitudinal direction of the vehicle body, and the radiator is composed of a pair of upper and lower water tanks and a flat water pipe that communicates between the two water tanks. A motorcycle with a cowling that slopes outward and backward. 2. The cowling has a head pipe fixed to its front end to constitute a part of the vehicle body frame, and the left and right side plates of the cowling are firmly connected via the power unit in order to give the cowling strength as a vehicle body frame. Motorcycles described in item 1 of the scope. 3. A rear wheel drive power unit located between the front and rear wheels is covered with a thin sheet cowling, and an air inlet is opened in the front of this cowling, and air outlets are opened in the left and right sides of the cowling, respectively. A pair of left and right power unit cooling radiators extending approximately in the longitudinal direction of the vehicle body are installed at these air outlets, and each radiator is composed of a pair of upper and lower water tanks and a flat water pipe that communicates between the two water tanks. , a motorcycle in which a flat side surface of the flat water pipe is inclined rearward and outwardly from the cowling. 4. The motorcycle according to claim 3, wherein the pair of radiators are connected to the power unit in parallel with each other.