JP3193709B2 - Scooter type vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a scooter type vehicle in which a storage box is installed below a seat and a unit swing type engine is disposed below the storage box.

[0002]

[Prior art]

In a scooter-type vehicle, a step board portion is formed with a deep gap between the steering wheel and the seat, and the rear body on which the seat is mounted is set to a relatively large volume in order to lay the step board portion in front of the seat. The layout of a scooter-type vehicle is that a storage box is installed inside the rear body, and a unit swing type engine is arranged below it.

FIG. 6 shows a scooter type motorcycle.

A front wheel a steered by a steering wheel c and a rear wheel b driven by an engine d are arranged in front and rear. e is mounted on a rear body h which also serves as a storage box g, and a unit swing type engine d is provided below the rear body h.
Is arranged.

[0005] In the unit swing type engine, a crankcase j is connected to the rear of a cylinder i inclined forward substantially horizontally, and a swing case k is connected to the rear from one side of the crankcase j. A rear wheel b located immediately behind the case j is pivotally supported, a front lower support arm l is pivotally supported by a frame n by a pivot m so as to be vertically swingable, and a rear upper part is supported by a rear cushion unit o. Then, it is buffered and suspended.

The exhaust pipe p is led downward from the cylinder i, and the intake pipe q is introduced into the upper front part 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.

In such a unit swing type engine, the position and clearance relationship between the storage box g and its upper part, that is, the cylinder i, the carburetor r, and other components such as an oil pump and an ignition coil disposed in the upper front part of the crankcase,
Further, when a fuel tank and an oil tank are arranged behind the storage box, the stroke amount of the rear cushion unit o is determined by the positional relationship between the fuel tank and the oil cleaner and the rear wheel. Similarly, the seat height and the shape of the bottom surface of the storage box g are determined by this positional relationship.

For this reason, the stroke amount of the rear cushion unit o is increased with an emphasis on riding comfort, the seat height is improved by lowering the seat height, or the shape of the bottom surface of the storage box g is improved to reduce the capacity. There are restrictions on the desire to increase the size, and in many cases, not all of them can satisfy individual requirements.

Further, the cylinder i, the carburetor r, the air cleaner s, the ignition coil, the oil pump, the casing of the forced air-cooled engine and the cooling fan, and the like have individual shapes in their respective functions, thus forming irregularities. At the same time as the above restrictions are strict, when the unit swing type engine is attached to or detached from the vehicle body, there is a lot of interference, which is a main cause that the workability of attaching and detaching cannot be improved.

[0010]

[Problems to be solved by the invention]

The present invention arranges the upper portion of the unit swing type engine in the above circumstances, rationalizes the positional relationship with the bottom surface of the storage box, and helps to improve the stroke amount, seat height, and storage box capacity of the rear cushion unit. It is another object of the present invention to provide a scooter-type vehicle having improved workability of attaching and detaching a unit swing type engine.

[0011]

[Means for Solving the Problems]

In order to solve the above-described problem, the scooter type vehicle according to the present invention has a step board portion in which a gap between a handle and a seat is deeply formed, and a storage box is installed in a rear body below the seat, and a storage box is provided below the rear body. On the other hand, the unit swing type engine is mounted on a crankcase having a cylinder extending forward, and a swing case connected to the crankcase and extending rearward, and supporting a rear wheel at a rear portion. And an intake passage provided above the crankcase and below the storage box, and an engine intake system component including a carburetor and an air cleaner.The unit swing type engine is provided around a pivot provided on the crankcase. In a scooter-type vehicle suspended in a vertically swingable manner, (A) the engine The intake passage, carburetor, and air cleaner of the gin intake system parts, the upper part of the unit swing type engine, the rearmost air cleaner from the frontmost intake passage, from the front to the rear of the vehicle, and from the center in the vehicle width direction to the outside. (B) an oil pump is disposed adjacent to the side of the intake passage mounting portion on the crankcase, and (C) the bottom surface of the storage box has a front portion above a cylinder front portion and a rear portion. (D) The oil is formed so that a common tangent line in contact with the upper part of the side profile of the oil pump and the upper part of the side profile of the air cleaner is inclined rearward and upward. The height of the upper contour of the pump and the air cleaner is gradually increased toward the rear, and (E) the upper part of the carburetor is connected to a common tangent line. The storage box is disposed so as to be located at a lower position, and is formed such that a common tangent line is substantially parallel to the bottom surface near the flat bottom surface of the storage box when the unit swing type engine makes a maximum swing stroke upward. It is.

[0012]

[Action]

In the scooter-type vehicle according to the present invention, the side profile of the upper surface of the unit swing type engine does not protrude above a common tangent extending upward and rearward even if there are irregularities in various parts of the engine intake system component. In addition, the positional relationship with the bottom of the storage box is simplified, and the trajectory and range of the swing around the pivot are also simplified. Therefore, it is easy to increase the stroke amount of the rear cushion unit, which contributes to improvement of the riding comfort. In connection with this, the seat height can be reduced and the footwear can be improved, and the bottom of the storage box can be further improved. Since the shape is flat, the formation is easy, and the capacity can be increased without difficulty.

[0013] Furthermore, by inclining the common tangent line in contact with the upper part of each side profile of the oil pump and the air cleaner toward the rear upper side, it is easy to avoid interference with the vehicle body on the side of the storage box having a flat bottom surface. Workability of attaching and detaching is improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a right side view of a scooter type motorcycle according to an embodiment of the present invention, FIG. 2 is a plan view of the scooter type motorcycle, and FIG. 3 is a scooter type motorcycle. It is a left view of a two-wheeled vehicle.

A step board 6 is supported by a front wheel 1 steered by a steering wheel 3 and a rear wheel 2 driven by a unit swing type engine 4. In the scooter type vehicle, the rear body 7 on which the seat 5 is mounted is set to a relatively large volume, and the 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 installed at a front part, and a fuel tank 9 and an oil tank 10 are arranged at a rear part. The storage box 8 has a volume that can store the full face helmet 11.

In the unit swing type engine 4, a crankcase 13 is connected to the rear of a cylinder 12 that leans forward substantially horizontally,
Swing case back from one side of the crankcase 13
The rear wheel 2 is pivotally mounted at the rear of the rear wheel 2 at a position immediately behind the crankcase 13. In the unit swing type engine 4, a support arm 15 is provided at a lower front portion of the crankcase 13, and the support arm 15 is pivoted.
The shaft 16 supports the frame 17 so that it can swing up and down. The rear upper portion of the unit swing type engine 4 is supported by a rear cushion unit 18 and is suspended by a cushion.

The exhaust passage 19 is led out from the lower surface of the cylinder 12, and is provided at a side of the rear wheel 2 opposite the swing case 14.
Continuous. On the other hand, the intake passage 21 is introduced into a front upper portion of the crankcase 13 from a carburetor 22 located above the rear of the crankcase 13, and an air cleaner 23 is connected to the rear of the carburetor 22. An engine intake system component is formed from the intake passage 21, the carburetor 22, and the air cleaner 23, and is disposed above the unit swing type engine 4.

In addition, an ignition ignition coil 24 is mounted on a front portion of one side of the crankcase 13, and a front upper portion of the crankcase 13 is arranged in parallel with an introduction portion of the intake passage 21 as shown in FIG. An oil pump 25 for lubricating each part of the engine is arranged. The unit swing type engine is of a forced air cooling type. The surface of the cylinder 12 is covered with a cowling for guiding air, and one side of the crankcase 13 is covered with a casing 26 of a blower fan supported at the end of the crankshaft. Is being worn.

The unit swing type engine 4 configured as described above
Due to the nature of the parts, the top of the irregularities defined in the side profile of the top part is the cylinder 12, fan casing 2
6 and those having relatively high degrees of freedom, such as the carburetor 22, the air cleaner 23, the ignition coil 24, and the oil pump 25.

Here, the oil pump 25 is disposed on the crankcase 13 for the following reason.

In this type of scooter type vehicle, the oil tank 10 is installed on the vehicle body side, and the oil path of the oil supplied from the oil tank 10 to the unit swing type engine 4 is reduced to the shortest distance in consideration of oil supply efficiency. Length. For this reason, the oil pump 25 is located at a position close to the oil tank 10 and also close to the engine 4, that is, an upper position of the crankcase 13 is a preferable arrangement position.

On the other hand, if the oil pump 25 is disposed on the front surface or the lower surface of the engine 4, there is a risk of damage due to flying stones, which causes a problem in durability, and also prevents the collision of stones and sand rolled up by the rear wheel 2. For this purpose, it is desirable to dispose it at a position far from the rear wheel 2.

The oil pump 25 is generally driven by the rotational driving force of the crankshaft of the unit swing type engine 4.
It is necessary to dispose it at a position close to 12 (on the upper front side of the crankcase 13).

Further, when the oil pump 25 is disposed on the outer surface of the unit swing type engine 4, the engine outer surface at the mounting position of the oil pump 25 exposed to the outside has a complicated shape, and there is a possibility that the oil pump 25 comes into contact with the rider's foot. As a result, the ride feeling is poor, and the aesthetic appearance is impaired, and the merchantability may be impaired.

Judging from these points, it is necessary to arrange the oil pump 25 on the unit swing type engine 4 at a position where the sand and stones wound up by the rear wheels are unlikely to collide with each other. The above is the most effective and preferred arrangement position.

The oil pump 25 disposed on the crankcase 13 of the unit swing type engine 4 has a dimension in the height direction, and is attached to the crankcase 13 in front of the carburetor 22 constituting the engine intake system. Is done. The component projecting above the crankcase 13 ahead of the carburetor 22 is an oil pump 25, and the oil pump 25 is a component located at the highest position among the components of the unit swing type engine located forward of the carburetor 22. It is.

For this reason, the crankcase 13 is provided in front of the carburetor 22.
The highest oil pump 25 provided is a component having a common tangent symmetrical.

Then, the upper end of the side profile of the oil pump 25,
A straight line on a common tangent line that is in contact with two places at the upper end of the side profile of the air cleaner 23 is assumed as a reference line XX, and the upper end of the side profile of the carburetor 22 is the reference line XX
Carburetor to match or be located below
22 are installed. FIG. 1 shows an example in which a common tangent line in contact with the upper side profile of the carburetor 22 and the upper side profile of the air cleaner 23 coincides with the reference line XX, and the common tangent line is inclined upward and rearward. I have.

That is, as shown in FIG. 4, the carburetor 22 has the throttle lever 29 located on the side and the throttle lever 29
A throttle lever box 28 is attached and is attached to the side. As for the carburetor 22, the throttle cable 30 is led out from the front of the throttle lever box 28, and the carburetor 22 has no projection on its upper surface. And the float chamber 27 is the crankcase
It is held low so as to penetrate into the recess between 13 and the rear wheel 2.

In this way, when the unit swing type engine 4 buffers around the pivot 16, the side profile of the upper surface portion swings together with the reference line XX, and the storage box 8
The positional relationship between the bottom surface 8a, the fuel tank 9, and the oil tank 10 and the swing locus are simplified, and the maximum swing stroke of the unit swing type engine 4 is represented by X1-X1. When the reference line XX reaches the position of X1-X1 by the maximum swing stroke upward about the pivot 16, the reference line X1-X1 becomes substantially flat as shown in FIGS. It is formed substantially parallel to the bottom surface 8a.

As a result, the stroke amount of the rear cushion unit is increased, the riding comfort is improved, the seat height is reduced, the footwear is improved, and the capacity of the storage box bottom is set without restriction to increase the capacity. Is made possible without difficulty.

Further, in the embodiment of the scooter type vehicle, since there is no protrusion beyond the reference line XX, it is easy to avoid interference with the vehicle body, and the workability when attaching and detaching the unit swing type engine 4 to and from the vehicle body is improved. Significantly improved.

Further, the pivot may be set in front of and above the crankcase 13 (for example, 16a in FIG. 3), and the same applies to natural air cooling and water-cooled engines other than forced air cooling.

[0036]

【The invention's effect】

As described above, the scooter type vehicle according to the present invention has the structure described in claim 1, and the upper surface of the unit swing type engine has an oil pump even if there are irregularities in various parts of the engine intake system parts. And the side profile that does not protrude toward the storage box side from the common tangent line in contact with the upper part of each side profile of the air cleaner, so the positional relationship with the bottom surface of the storage box is simplified, and the range of the swing locus around the pivot is also simplified. The stroke amount of the rear cushion unit can be increased, and the riding comfort can be improved.
While the seat height can be reduced to improve the footwear, the interference between the unit swing type engine and the vehicle body can be easily avoided.

Also, by dispersing the engine intake system components on the upper part of the unit swing type engine, all the engine intake system components such as the air cleaner can be arranged on the engine side, and the workability of attaching and detaching the unit swing type engine to the vehicle body can be improved. Can be improved and simplified.

Furthermore, the upper surface of the unit swing type engine has a side profile in which the carburetor does not protrude toward the storage box side from the common tangent line of each upper part of the oil pump and the air cleaner even if there are irregularities in various places. , The workability of the box can be improved, and the capacity of the box can be increased without difficulty.

Further, in this scooter type vehicle, since the intake passage from the carburetor is mounted at the center of the crankcase in the vehicle width direction, the air-fuel mixture is guided into the crank chamber in a well-balanced left and right direction in the vehicle width direction. Thus, the air-fuel mixture can be stably supplied to the cylinder without bias, and a stable high output can be obtained smoothly.

[Brief description of the drawings]

FIG. 1 is a right side view showing a first embodiment of a scooter type vehicle according to the present invention.

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

FIG. 3 is a left side view of the scooter type vehicle in FIG. 1;

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 right side view of a conventional scooter type motorcycle.

[Explanation of symbols]

 1 Front wheel 2 Rear wheel 4 Unit swing type engine 5 Seat 7 Rear body 8 Storage box 11 Helmet 12 Cylinder 13 Crankcase 14 Swing case 16 Pivot 18 Rear cushion unit 21 Intake passage 22 Carburetor 23 Air cleaner 24 Ignition coil 25 Oil pump 26 Ventilation fan casing

Claims (1)

(57) [Claims] 1. A step board portion in which a space between a steering wheel and a seat is deeply inserted to form a step board portion, a storage box is installed in a rear body below the seat, and a unit swing type engine is mounted under the rear body. The swing type engine includes a crankcase having a cylinder extending forward, a swing case connected to the crankcase and extending rearward, and supporting a rear wheel at a rear portion, and a portion above the crankcase and below the storage box. An engine intake system component comprising an intake passage, a carburetor, and an air cleaner provided in the unit swing type engine, wherein the unit swing type engine is a scooter type vehicle which is suspended so as to swing up and down around a pivot provided in a crankcase. (A) the intake passage, carburetor and air cleaner of the engine intake system components And (B) the upper part of the unit swing type engine, in which a rearmost air cleaner is arranged from a frontmost intake passage to a rearmost air cleaner in order from the front to the rear of the vehicle and from the center to the outside in the vehicle width direction. An oil pump is disposed adjacent to the side of the intake passage mounting portion on the crankcase. (C) The bottom surface of the storage box is flat, with the front part located above the cylinder front part and the rear part located above the air cleaner front part. (D) the height of the upper contours of the oil pump and the air cleaner is adjusted rearward so that a common tangent line contacting the upper side profile of the oil pump and the upper side profile of the air cleaner is inclined rearward and upward. (E) the carburetor is arranged so that its upper part is located below a common tangent line, and A scooter-type vehicle, wherein a common tangent line is formed near a flat bottom surface of the storage box and substantially parallel to the bottom surface when the mold engine makes a maximum swing stroke upward.