JPH1067369A - Scooter type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both ensuring the capacity of a storage box, and improving engine performance. SOLUTION: The bottom surface 8a of a storage box 8 is formed so that its rear side may go upward, an intake pipe 21, a carburetor 22 and an air cleaner 23 are arranged linearly in order from the front side of a vehicle, and aligning axes for connecting the crank case introduction part of the intake pipe 21, the carburetor 22 and the air cleaner 23 are crossed at an acute angle to the center line on its front and rear of a vehicle body when viewed from the above. The height of the upper part outline of the intake pipe 21, the carburetor 22 and the air cleaner 23 is formed so that it may increase to rearward when viewed from the side. An oil pump 25 is disposed just next to the crank case introduction part of the intake pipe 21, and a float chamber 27 of the carburetor 22 is stored in a groove of U shape when viewed from the above, which is formed between a crank case 13 and a rear wheel 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter type vehicle in which a storage box is provided below a seat and a unit swing type engine is disposed below the storage box.

[0002]

2. Description of the Related Art In order to lay a step board portion in front of a seat, a layout is adopted in which a rear body on which the seat is mounted is set to a relatively large volume, a storage box is provided inside, and a unit swing type engine is disposed below the storage box. This is a feature of scooter type vehicles.

FIG. 7 is a left side view showing an example of a conventional scooter type vehicle. This scooter type vehicle has a steering wheel c
The front wheel a, which is steered by the steering wheel, and the rear wheel b, which is driven by the unit swing type engine d, are arranged in front and rear. The gap between the steering wheel c and the seat e is low and the step board f is laid. It is mounted on a rear body h containing a box g, and a unit swing type engine d is arranged below the rear body h.

A unit swing type engine d includes a crankcase j having a cylinder portion i extending substantially horizontally forward and a swing case k connected to one side (for example, left side) of the crankcase j and extending rearward. It is unitized, and the rear wheel b
And the rear wheel b is located immediately behind the crankcase j.

The crank case j is provided with a pair of left and right support arms 1 extending forward.
A pivot shaft m extending in the vehicle width direction and supported at the tip of the frame n is supported by the frame n. For this reason, the unit swing type engine d can swing up and down about the pivot axis m with respect to the frame n, and is buffer-suspended by the rear upper portion of the swing case k being supported by the rear cushion unit o.

[0006] The exhaust pipe p is led downward from the cylinder portion i, and the intake pipe q is introduced to the front upper surface of the crankcase j. The carburetor r connected to the intake pipe q is located above and behind the crankcase j, and the air cleaner s is further connected to the rear. The exhaust pipe p, the intake pipe q, the carburetor r, the air cleaner s, and the like rotate up and down around the pivot axis m together with the unit swing type engine d. Further, an oil pump (not shown) is provided in the crankcase j.

[0007]

The above-mentioned components such as the intake pipe q, carburetor r, air cleaner s, oil pump and the like are placed as close as possible to the cylinder part i in order to improve the intake performance and lubrication performance of the engine. Need to be placed. However, since these parts are provided between the unit swing type engine d and the storage box g, there is a great restriction on the arrangement thereof. For example, when these parts are brought close to the cylinder part i, In order to improve the engine performance, it is necessary to raise the bottom surface of the storage box g to avoid the interference, and it becomes impossible to secure a large capacity of the storage box g.

The present invention has been made in order to solve this problem, and an object of the present invention is to provide a scooter-type vehicle which can ensure both the capacity of a storage box and the improvement of engine performance.

[0009]

In order to achieve the above object, a scooter-type vehicle according to the present invention has a step board portion in which a gap between a steering wheel and a seat is deepened, and a storage box is provided in a rear body below the seat. Installed and unitized by a crankcase with a cylinder part that extends substantially horizontally forward under its rear body, and a swing case that is connected to this crankcase and extends rearward, and supports the rear wheel at the rear. A unit swing type engine is suspended and suspended so as to be able to swing up and down around a pivot shaft provided at a front portion of a crankcase, and a carburetor and an air cleaner are provided above the unit swing type engine and below a storage box. In a scooter-type vehicle with an intake pipe extending from the top of the crankcase, The intake pipe, carburetor, and air cleaner are linearly arranged in order from the front of the vehicle in plan view, and the axis connecting the crankcase introduction part of the intake pipe, the carburetor, and the air cleaner is the vehicle body. In addition to making an acute angle with the front-rear center line, the height of the upper contours of the intake pipe, carburetor, and air cleaner in the side view increases toward the rear.

In addition, an oil pump is disposed immediately beside the crankcase introduction portion of the intake pipe, and a float chamber of the carburetor is formed in a plan view formed between a crankcase of the unit swing type engine and a rear wheel. It was housed in a U-shaped groove.

In the case of the above construction, since the bottom surface of the storage box is formed so as to rise backward, the storage box converges forward between the bottom surface of the storage box and the unit swing type engine in a side view. A wedge-shaped space is formed, and the intake pipe, carburetor, and air cleaner are arranged at the front, middle, and rear portions of the wedge-shaped space, and the heights of the upper contours of the intake pipe, carburetor, and air cleaner are increased rearward. Can be made as close as possible to the cylinder portion without interfering with the bottom surface of the storage box, and the intake resistance can be reduced to improve the intake performance.

In addition, the arrangement axis connecting the carburetor and the air cleaner with the crankcase introduction portion of the intake pipe intersects at an acute angle with the longitudinal center line of the vehicle body in plan view. The intake passage is shortest and straight, and also in this regard, the intake resistance is reduced, which contributes to the improvement of the intake performance. In addition, the carburetor and the air cleaner can be prevented from protruding to the side of the vehicle body.

Further, by disposing the oil pump immediately beside the crankcase introduction portion of the intake pipe, the oil supply pipe connected from the oil pump to the intake pipe can be minimized, and the oil flow path resistance can be reduced. Thus, the lubrication performance can be improved.

Furthermore, if the float chamber of the carburetor is housed in a U-shaped groove formed between the crankcase and the rear wheel, the installation position of the carburetor can be lowered, and the capacity of the storage box can be secured. Can be further contributed to.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 1 is a left side view of a scooter type vehicle showing one embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a right side view.

This scooter type vehicle includes a front wheel 1 steered by a steering wheel 3 and a rear wheel 2 driven by a unit swing type engine 4. The rear body 7 on which the seat 5 is placed is set to have a relatively large volume, and a unit swing type engine 4 integrated with the rear wheel 2 is disposed below the rear body 7.

In the rear body 7, a storage box 8 is provided at a front part, and a fuel tank 9 and an oil tank 10 are provided at a rear part.
Is arranged. The storage box 8 has a volume capable of storing the full-face helmet 11, and the bottom surface 8a is formed to rise rearward.

The unit swing type engine 4 is provided with a crankcase 13 having a cylinder portion 12 extending substantially horizontally forward, and connected to one side (for example, the left side) of the crankcase 13 to extend rearward. It is unitized by a swing case 14 for supporting the wheel 2 and the like. The rear wheel 2 is located immediately behind the crankcase 13.

A pair of left and right support arms 15 extending forward are provided at the front lower portion of the crankcase 13. A pivot shaft 16, which extends over the tip of the support arm 15 and extends in the vehicle width direction, is mounted on a frame 17. Supported. For this reason, the unit swing type engine 4 can swing up and down about the pivot shaft 16 with respect to the frame 17, and is supported by the rear cushion unit 18 at the rear upper portion of the swing case 14 so as to be buffer-suspended.

An exhaust pipe 19 extends downward from the lower surface of the cylinder portion 12, and the exhaust pipe 19 curves rearward to a muffler 20 disposed on the side of the rear wheel 2 opposite the swing case 14. Continuous. Exhaust pipe 19 and muffler 2
Numeral 0 rotates up and down around the pivot shaft 16 integrally with the unit swing type engine 4.

On the other hand, above the unit swing type engine 4 and below the storage box 8, an intake pipe 21, a carburetor 22, and an air cleaner 23 are arranged in order from the front side of the vehicle. A front end of the intake pipe 21 is introduced into a front upper surface of the crankcase 13, a carburetor 22 is connected to a rear end of the intake pipe 21, and an air cleaner 23 is connected to a rear part of the carburetor 22. These components 21, 22, and 23 also rotate vertically about the pivot shaft 16 integrally with the unit swing type engine 4.

In a side view (see FIG. 1), the heights of the upper contours of the intake pipe 21, the carburetor 22, and the air cleaner 23 increase toward the rear, and in a plan view (see FIG. 2), the intake pipe 21, the carburetor 22 and the carburetor 22. And the air cleaner 23 are linearly arranged, and an arrangement axis ZZ connecting the introduction portion of the intake pipe 21 to the crankcase 13 and the carburetor 22 and the air cleaner 23 intersects the vehicle longitudinal center line AA at an acute angle. Has been. In addition, you may incline so that the arrangement axis Z-Z may be shifted to the left side toward the rear of the vehicle body.

The carburetor 22 has a float chamber 27 (see FIG. 4) provided at a lower portion thereof, a U-shaped groove 32 formed between the crankcase 13 and the rear wheel 2 in a plan view.
It is housed inside.

Further, an oil pump 25 is provided on the upper surface of the crankcase 13 as shown in FIG. The oil pump 25 is disposed immediately beside (for example, on the left side) the introduction portion of the intake pipe 21 into the crankcase 13. The oil pump 25 and the intake pipe 21 are connected by an oil supply pipe 25a, and the oil discharged from the oil pump 25 is mixed with a fuel mixture flowing through the intake pipe 21 and supplied to the engine. I have.

The unit swing type engine 4 is of a forced air cooling type, and a blower fan casing 26 having a shape covering up to the cylinder portion 12 is attached to one side (for example, the right side) of the crankcase 13, and the inside thereof is provided. Is provided with a blower fan (not shown) driven by a crankshaft, and cooling air generated by the blower fan is guided to the cylinder portion 12 to cool the cylinder portion 12.

In this embodiment, the front and rear positions of the uppermost part of the blower fan casing 26 are positioned so as to be arranged beside the intake pipe 21 and the oil pump 25, and the height thereof is
1 and the oil pump 25 or less. An ignition coil 24 is provided in the upper front part of the crankcase 13 and on the opposite side (here, left side) of the blower fan casing 26.

The scooter type vehicle configured as described above has the following advantages.

First, since the bottom surface 8a of the storage box 8 is formed so as to rise rearward, the bottom surface 8a of the storage box 8 is formed.
A wedge-shaped space that converges toward the front of the vehicle body when viewed from the side is formed between the unit a and the unit swing type engine 4. The heights of the upper contours of the intake pipe 21, the carburetor 22, and the air cleaner 23 disposed at the front, middle, and rear portions of the wedge-shaped space increase rearward, respectively.
The members 21, 22, and 23 can be made as close as possible to the cylinder portion 12 without interfering with the bottom surface 8a of the storage box 8, that is, without sacrificing the capacity of the storage box 8. Therefore, the intake passage length can be shortened to reduce the intake resistance, and the intake performance can be improved, that is, the output of the engine can be improved.

Moreover, the members 21, 22 are arranged such that an arrangement axis ZZ connecting the crankcase introduction portion of the intake pipe 21, the carburetor 22, and the air cleaner 23 intersects the vehicle longitudinal center line AA at a sharp angle in plan view. , 23, the intake passage from the air cleaner 23 to the crankcase introduction portion of the intake pipe 21 is shortest and straight, and in this respect also, the intake resistance is reduced and the intake performance is improved. In addition, it is possible to prevent the carburetor 22 and the air cleaner 23 from protruding to the side of the vehicle body.

Further, by disposing the oil pump 25 immediately beside the crankcase introduction portion of the intake pipe 21, the oil supply pipe 25a connected from the oil pump 25 to the intake pipe 21 can be minimized, and the oil flow can be reduced. Road resistance can be reduced and lubrication performance can be improved.

Further, the float chamber 27 of the carburetor 22
In the U-shaped groove 32 formed between the crankcase 13 and the rear wheel 2 in a plan view, so that the installation position of the carburetor 22 is significantly lowered, which further contributes to securing the capacity of the storage box 8. Can be.

As described above, it is possible to ensure both the capacity of the storage box 8 and the improvement of the engine performance in both the intake performance and the lubrication performance. The pivot shaft may be set in front of and above the crankcase 13 (for example, 16a in FIG. 3), and the unit swing type engine 4 may be a water-cooled type or a natural air-cooled type.

By the way, the top of the unevenness formed in the side profile of the upper surface of the unit swing type engine 4 configured as described above has no flexibility like the cylinder part 12 and the fan casing 26 due to the nature of the parts. And a relatively high degree of freedom such as a carburetor 22, an air cleaner 23, an oil pump 25, an ignition coil 24, and the like.

In the embodiment shown in FIGS. 1 to 3, for example, a common tangential straight line contacting the upper end of the side profile of the oil pump 25 projecting above the crankcase 13 and the upper end of the side profile of the air cleaner 23 is formed. The carburetor 22 is installed such that the upper end of the side profile of the carburetor 22 coincides with or is lower than the reference line XX.

That is, as shown in FIG. 4, the carburetor 22 has a throttle lever 29 located on a side surface, a throttle lever box 28 attached thereto, a throttle cable 30 leading out from the front surface thereof, and a carburetor 22 having an upper surface portion. Those having no protrusion are used. And, as described above, the float chamber 27 includes the crankcase 13 and the rear wheel 2.
And lower so as to fit in a U-shaped groove 32 formed in a plan view formed between them.

Thus, when the unit swing type engine 4 swings about the pivot shaft 16, the side profile of the upper surface swings along with the reference line XX,
Bottom 8a and the fuel tank 9 of the storage box 8, the positional relationship and the swinging locus of the oil tank 10 is simplified, in the case of maximum rocking stroke, the form shown in X ₁ -X _1.

Thus, the rear cushion unit 18
To improve the ride comfort by increasing the stroke amount of the seat 5
The height of the storage box 8 can be improved by lowering the height of the storage box 8 and the capacity of the storage box 8 can be easily expanded by setting the shape of the bottom surface 8a without restriction.

Also, as in the embodiment shown in FIG. 6, a common tangential straight line that contacts the upper end of the side profile of the oil pump 25 and the upper end of the side profile of the rear wheel 2 is assumed to be a reference line YY. The upper ends of the side profiles of the carburetor 22 and the air cleaner 23 correspond to the reference line Y.
The carburetor 22 and the air cleaner 23 may be installed so as to be equal to or lower than −Y.

In this case, when the unit swing type engine 4 swings about the pivot shaft 16, the side profile of the upper surface swings along with the reference line YY,
Bottom 8a and the fuel tank 9 of the storage box 8, the positional relationship and the swinging locus of the oil tank 10 is simplified, in the case of maximum rocking stroke, the form shown in Y ₁ -Y _1.

As a result, the stroke amount of the rear cushion unit 18 is also increased to improve the riding comfort, the height of the seat 5 is reduced to improve the footing, and the shape of the bottom surface 8a of the storage box 8 is changed. It is reasonably possible to increase the capacity by setting without restriction.

Regardless of which of the reference lines XX and YY is set, there is no protrusion above the reference line XX or YY, so that interference with the vehicle body can be easily avoided and the unit swing type can be used. Workability when attaching and detaching the engine 4 to and from the vehicle body is greatly improved.

Further, such reference lines XX, YY
Is set, the pivot shaft is set above the front of the crankcase 13 (for example, 16 in FIG. 3).
a), and the unit swing type engine 4 may be a water-cooled type or a natural air-cooled type other than the forced air-cooled type.

[0044]

As described above, in the scooter type vehicle according to the present invention, the bottom surface of the storage box is formed so as to rise rearward, while the intake pipe, the carburetor, and the air cleaner are linearly arranged in order from the front side of the vehicle in plan view. The arrangement axis connecting the crankcase introduction part of the intake pipe, the carburetor, and the air cleaner should intersect at an acute angle with the center line of the front and rear of the vehicle, and the height of the upper contour of the intake pipe, the carburetor, and the air cleaner in the side view is So that it gets higher towards
The intake pipe, carburetor, and air cleaner are made as close to the cylinder as possible without interfering with the bottom of the storage box, and the intake passage from the air cleaner to the intake pipe crankcase introduction is made the shortest and straight to reduce intake resistance And improve air intake performance,
The carburetor and the air cleaner can be prevented from protruding to the side of the vehicle body.

Also, the scooter type vehicle according to the present invention
Since the oil pump is arranged immediately beside the crankcase introduction part of the intake pipe, the oil supply pipe connected from the oil pump to the intake pipe can be minimized, the oil flow path resistance is reduced, and the lubrication performance is improved. Can be achieved.

Further, in the scooter type vehicle according to the present invention, the float chamber of the carburetor is housed in a U-shaped groove formed in plan view formed between the crankcase and the rear wheel of the unit swing type engine. In addition, the installation position of the carburetor can be lowered, which can further contribute to securing the capacity of the storage box.

As described above, according to the scooter type vehicle according to the present invention, it is possible to achieve both the securing of the capacity of the storage box and the improvement of the engine performance.

[Brief description of the drawings]

FIG. 1 is a left side view of a scooter type vehicle showing an embodiment of the present invention.

FIG. 2 is a plan view of the scooter type vehicle.

FIG. 3 is a right side view of the scooter type vehicle.

FIG. 4 is an enlarged side view of the carburetor.

FIG. 5 is an enlarged plan view of the oil pump.

FIG. 6 is a left side view showing another embodiment of the scooter type vehicle.

FIG. 7 is a left side view of a conventional scooter type vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 3 Handle 4 Unit swing type engine 5 Seat 6 Step board 7 Rear body 8 Storage box 8a Bottom of storage box 12 Cylinder part 13 Crankcase 14 Swing case 16 Pivot shaft 21 Intake pipe 22 Carburetor 23 Air cleaner 25 Oil pump 27 Float chamber 32 U-shaped groove in plan view A-A Vehicle front-rear center line XX Array axis

Claims (3)

[Claims] 1. A crank having a step board portion in which a space between a handle and a seat is deeply bent to form a step board portion, a storage box is installed in a rear body below the seat, and a cylinder portion extending substantially horizontally forward below the rear body. A unit swing type engine united by a case and a swing case connected to this crankcase and extending rearward and supporting the rear wheel at the rear is centered on a pivot shaft provided at the front of the crankcase. In a scooter type vehicle in which a carburetor and an air cleaner are provided above the unit swing type engine and below the storage box, and are provided with an intake pipe extending from the carburetor on an upper surface of a crankcase, the storage box is provided. Of the intake pipe, carburetor and air The liners are arranged linearly in order from the front of the vehicle, and the arrangement axis connecting the crankcase introduction part of the intake pipe, the carburetor, and the air cleaner intersects at an acute angle to the vehicle front-rear center line. A scooter-type vehicle, wherein the height of the upper contours of the carburetor and the air cleaner is increased rearward. 2. The scooter-type vehicle according to claim 1, wherein an oil pump is disposed immediately beside the crankcase introduction portion of the intake pipe. 3. The U-shaped groove formed in a plan view formed between a crankcase and a rear wheel of the unit swing type engine.
And 2. The scooter type vehicle according to 2.