JPH0459494A - Motor scooter type vehicle - Google Patents

Abstract

PURPOSE:To enhance the operating easiness in mounting and removal of an engine by arranging the upper part of the profile of a carburettor so as not to protrude up a reference line, increasing the stroke of a rear cushion unit, sinking the seat level, and enlarging the capacity of an accommodation box. CONSTITUTION:The straight line as common tangential to the profile of the oil pump 25 upper part and the profile of the air cleaner 23 oversurface is assumed as a reference line X-X, and a carburettor 22 is installed so that the top of the profile of the carburettor 22 upper part is located identical or below this reference line X-X. With this carburettor 22, a throttle lever 29 is situated on the side face, and a throttle lever box 28 is mounted, and from its front face a throttle cable 30 is led out ahead. wherein no projection should exist on the oversurface. A float chamber 27 intrudes in a recess between a crank case 13 and rear wheel 2 so as to acomplish a less tall structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a scooter type vehicle in which a storage box is installed under the seat and a unit swing type engine is placed under the storage box.

(Prior technology) In order to install a step board section in front of the seat, the rear body on which the seat rests is set to have a relatively large volume and has a storage box inside, and a unit swing type engine is placed below it. This is a characteristic of scooter-type vehicles.

FIG. 7 shows a scooter type two-wheeled motor vehicle.

A front wheel a, which is steered by a handle C, and a rear wheel, which is driven by an engine d, are arranged in the front and rear, and a step board f is laid in a low indentation between the handle C and the seat e, and the seat e is a storage box. The unit swing type engine d is placed on a rear body h which also serves as a engine g, and a unit swing type engine d is placed under the rear body h.

In a unit swing type engine, a crankcase j is connected to the rear of a cylinder i that tilts forward almost horizontally, and a swing case k is connected to the rear from one side of the crankcase j. The rear wheel located directly behind is pivotally supported, the lower front support arm I is pivotally supported on the frame n by a pivot m so as to be able to swing vertically, and the rear upper part is supported by a reaction unit 0. , buffer suspended.

Further, the exhaust pipe p is guided downward from the cylinder i, and the intake pipe q is introduced into the front upper part of the crankcase j. A carburetor r connected to an intake pipe q is located at the upper rear of a crankcase J, and an air cleaner S is further connected to the rear thereof.

In such a unit swing type engine, the position and clearance relationship between the upper part of the engine, that is, the cylinder i, the carburetor r1, the oil pump, the ignition coil, etc. arranged at the front upper part of the crankcase, and the storage box g,
Furthermore, if a fuel tank or oil tank is placed behind the storage box, the stroke amount of reaction unit 0 is determined by the positional relationship between these tanks, the air cleaner, and the rear wheels. Similarly, this positional relationship determines the seat height and the shape of the bottom of the storage box.

For this reason, it is possible to increase the capacity by increasing the stroke amount of the reaction unit 0 with emphasis on ride comfort, by lowering the seat height to improve footing, and by improving the shape of the bottom of the storage box g. There were constraints on the demands made, and in many cases it was not possible to satisfy not only all of them, but also the demands of other parties.

In addition, the cylinder i, carburetor r, air cleaner S, ignition coil, oil pump, and the casing of the cooling fan in the case of a forced air-cooled engine have uneven shapes due to their functions, so the above restrictions apply. At the same time, there was a lot of interference when attaching and detaching the unit swing type engine to the vehicle body, which was the main reason why the workability of attaching and detaching could not be improved.

(Problems to be Solved by the Invention) This invention addresses the above-mentioned circumstances by organizing the upper part of the unit swing type engine, rationalizing the positional relationship with the bottom of the storage box, and improving the stroke amount of the reaction unit and the seat. The present invention aims to provide a scooter type vehicle which is useful for improving storage box capacity and improves the workability of attaching and detaching a unit swing type engine.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the scooter type vehicle of the present invention has a step board section with a deep indentation between the handle and the seat, and a storage box in the rear body below the seat. Under the rear body, there is a cylinder part that tilts forward almost horizontally, a swing case that extends rearward from the crankcase and integrally supports the rear wheel at the rear, and a carburetor that is placed above the rear of the crankcase. Furthermore, in a scooter type vehicle in which a unit swing type engine, which is made into a unit by an air cleaner etc. placed behind it, is buffer-suspended by a pivot so that it can swing up and down, the side surface of the upper surface of the oil pump placed at the front upper part of the crankcase. With profile.

A common tangential straight line that is in contact with the side profile of the upper surface of the air cleaner is used as a reference line, and the configuration is such that the upper part of the side profile of the carburetor does not protrude above this reference line.

Further, in the second invention, the space between the handle and the seat is deeply indented to form a step board part, a storage box is installed in the rear body below the seat, and a cylinder part tilted forward almost horizontally is installed under the rear body. , a unit swing type consisting of a swing case that extends rearward from the crankcase and integrally supports the rear wheel at the rear, a carburetor placed above the rear of the crankcase, and an air cleaner placed behind it. In a scooter-type vehicle in which the engine is shock-suspended so as to be able to swing up and down using a pivot, a common tangential straight line that touches the side profile of the upper surface of the oil pump located at the front upper part of the crankcase and the side profile of the upper part of the rear wheel. is the reference line,
The configuration is such that the upper portions of the side profiles of the carburetor and air cleaner do not protrude above this reference line.

(Function) With this structure, both the first invention and the second invention,
Even if the side profile of the upper surface of the unit swing type engine has irregularities in various places, the top does not protrude beyond the reference line, so the positional relationship with the storage box is simplified, and the swing trajectory around the pivot , the range is also simplified. Therefore, it is easy to increase the stroke amount of the reaction unit, which helps improve riding comfort, and related to this, the seat height can be lowered to improve footing, and the storage box The degree of freedom in the shape of the bottom surface is expanded, making it possible to easily expand the capacity.

Additionally, the presence of the reference line makes it easier to avoid interference with the vehicle body, improving work efficiency when attaching and detaching the unit swing type engine.

(Example) DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below.

First, in the first invention, FIG. 1 is a right side view, FIG. 2 is a plan view, and FIG. 3 is a left side view of a scooter type two-wheeled motor vehicle according to an embodiment thereof.

It is supported by a front wheel 1 that is steered by a handlebar 3 and a rear wheel 2 that is driven by a unit swing type engine 4, and a step board 6 is laid in a low indentation between the handlebar 3 and the seat 5, so that the seat 5 The rear body 7 on which the vehicle is mounted is set to have a relatively large volume, and the unit swing type engine 4, which is integrated with the rear wheel 2, is disposed below it.

Inside the rear body 7, a storage box 8 is installed at the front, and a fuel tank 9 and an oil tank 10 are placed at the rear. The storage box 8 has a volume that can accommodate a full-face helmet 11.

In the unit swing type engine 4, a crankcase 13 is connected to the rear of a cylinder 12 that tilts forward almost horizontally, and a swing case 14 is connected to the rear from one side of the crankcase 13. 1
The rear wheel 2, which is located immediately behind the wheel 3, is also pivoted. and,
The front lower part is pivotally supported on a frame 17 by a support arm 15 or a pivot 16 so as to be able to swing up and down, and the rear upper part is supported by a reaction unit 18 for buffer suspension.

The exhaust passage 19 is led out from the lower surface of the cylinder 12 and continues to a muffler 20 arranged on the side of the rear wheel 2 on the opposite side of the swing case 14. On the other hand, the intake passage 21 is introduced into the front upper part of the crankcase 13 from the carburetor 22 located at the rear upper part of the crankcase 13, and is further introduced into the front upper part of the crankcase 13.
An air cleaner 23 is connected to the rear of the air cleaner 23 .

In addition, an ignition coil 24 for ignition is attached to the front part of one side of the crankcase 13, and as shown in FIG. A pump 25 is arranged. Furthermore, this engine is of a forced air cooling type, and the surface of the cylinder 12 is covered with a wind guide ring, and one side of the crankcase 13 is covered with a casing 26 of a blower fan that is pivotally supported at the end of the crankshaft. There is.

Due to the nature of the parts, the tops of the irregularities drawn in the side profile of the upper surface of the unit swing type engine 4 configured in this manner are not only for parts that do not have a degree of freedom, such as the cylinder 12 and fan casing 26, but also for the carburetor 22 and air cleaner. 23. Ignition coil 24. They are broadly classified into those with a relatively high degree of freedom, such as the oil pump 25.

And the side profile of the upper part of the oil pump 25,
A common tangential straight line touching two points on the side profile of the upper surface of the air cleaner 23 is assumed as a reference line XX,
The carburetor 22 is installed so that the upper end of the side profile of the upper part of the carburetor 22 is located at or below the reference line XX.

That is, as shown in FIG. 4, in the carburetor 22, the throttle lever 29 is located on the side surface, the throttle lever box 28 is attached, the throttle cable 30 is guided forward from the front surface of the carburetor 22, and a protrusion is provided on the top surface. Either it doesn't exist or it's used. The float chamber 27 is held low so as to enter the recess between the crankcase 13 and the rear wheel 2.

In this way, when the uni-soto swing type engine 4 buffers around the pivot 16, the side profile of its upper surface swings along with the reference line The positional relationship and the swing locus are simplified, and in the case of the maximum swing stroke, the shape is shown as Xl-Xl.

This increases the stroke amount of the reaction unit to improve riding comfort, lowers the seat height to improve footing, and allows the bottom shape of the storage box to be set without restrictions to increase capacity. , becomes possible without difficulty.

Next, FIG. 6 is a side view of a scooter type two-wheeled motor vehicle showing an embodiment of the second invention.

A common tangential straight line that touches the side profile of the upper part of the oil pump 25 and the side profile of the upper part of the rear wheel 2 is assumed as a reference line Y-Y, and ,
The carburetor 22 and the air cleaner 23 are installed so as to be aligned with or below this reference line YY.

When the unit swing type engine 4 buffers around the pivot 16, the side profile of its upper surface swings along with the reference line Y-Y, and the bottom surface 8a of the storage box 8 and the fuel tank 9. The positional relationship with the oil tank 10 and the swing locus are simplified, and in the case of the maximum swing stroke, Y
, -Y.

This increases the stroke amount of the reaction unit to improve ride comfort, lower the seat height (to improve footing), and expand the capacity by setting the bottom shape of the storage box without any restrictions. But it becomes possible without any difficulty.

In addition, since there is no protrusion beyond the reference line XX in the first invention and the reference line Y-Y in the second invention, interference with the vehicle body can be easily avoided, and the unit swing type engine can be mounted and removed from the vehicle body. Work efficiency is greatly improved.

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

〔Effect of the invention〕

As mentioned above, the scooter type vehicle according to the present invention has the first
In the invention, a common tangential straight line that touches the side profile of the upper surface of the oil pump disposed at the front upper part of the crankcase and the side profile of the upper surface of the air cleaner is taken as a reference line, and the upper side profile of the carburetor is aligned with this reference line. In the second invention, the reference line is a common tangential straight line that is in contact with the side profile of the upper surface of the oil pump disposed at the front upper part of the crankcase and the side profile of the upper part of the rear wheel. The upper part of the side profile of the carburetor and air cleaner is set to a straight line that is tangent above this reference line, and the upper part of the side profile of the carburetor and air cleaner is set so as not to protrude above this reference line. Therefore, the stroke amount of the reaction unit can be easily increased, the seat height can be lowered, and the storage box capacity can be expanded, and the workability of attaching and detaching the unit swing type engine can be improved.

21...Intake passage, 22...Carburetor, 2
3...Air cleaner, 24...Ignition coil, 25...Oil pump, 26...Blower fan casing.

Claims (1)

[Claims] 1. The space between the handle and the seat is deeply curved to form a step board, a storage box is installed in the rear body below the seat, and under the rear body there is a cylinder part tilted forward almost horizontally. , a unit swing type consisting of a swing case that extends rearward from the crankcase and integrally supports the rear wheel at the rear, a carburetor placed above the rear of the crankcase, and an air cleaner placed behind it. In a scooter-type vehicle in which the engine is shock-suspended so as to be able to swing vertically using a pivot, a common tangential straight line that touches the side profile of the top surface of the oil pump located at the front upper part of the crankcase and the side profile of the top surface of the air cleaner. A scooter type vehicle characterized in that a reference line is set so that the upper part of the side profile of the carburetor does not protrude above the reference line. 2. The space between the handle and the seat is deeply indented to form a step board, and a storage box is installed in the rear body below the seat.Underneath the rear body, there is a cylinder part that is tilted forward almost horizontally, and a cylinder part that extends backward from the crankcase. The unit swing type engine consists of a swing case that integrally supports the rear wheel at the rear, a carburetor placed above the rear of the crankcase, and an air cleaner placed behind it. In a scooter-type vehicle that is swingably suspended for shock absorption, the reference line is a common tangential straight line that touches the side profile of the top surface of the oil pump located at the front upper part of the crankcase and the side profile of the upper part of the rear wheel. A scooter type vehicle characterized in that the upper side profile of the carburetor and air cleaner is set so as not to protrude above this reference line.