JPH01111593A - Scooter type motor bi- and tri-cycle - Google Patents

Abstract

PURPOSE: To ensure a foot placing space without prolonging a distance between shafts by arranging a foot placing plate at a higher position than a straight line connecting each axle of a front wheel and a rear wheel and arranging an engine unit in the vicinity of a shaft core height of a foot placing plate supporting part in a vehicle body frame. CONSTITUTION: Right and left forks 4a are supported on a steering shaft cylinder 3 fixed at a front end of a vehicle body frame 2, and a front wheel 5 on which a tire 5a having a large diameter and a large width is mounted is supported between right and left forks 4a through an axle 6. Moreover, a foot placing plate 19a is arranged above each support part 9b, 10a of a main pipe 9 and side pipes 10. Furthermore, an engine unit 13 is arranged below a side cover 12, and a rear wheel 14 on which a tire 14a having a large diameter and a large width is mounted is supported in a rear end part of a transmission case 13b through an axle 15. Shaft cores of each support part 9b, 10a are arranged at higher positions than a straight line L connecting each axle 6, 15. Consequently, the foot placing plate 19a is arranged at a further higher position than the straight line L.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scooter type motorbike or tricycle in which the front side portion of the seat of the vehicle body frame is bent downward, and a low-floor footrest is arranged at the bent portion. In particular, the present invention relates to scooter-type motorcycles and tricycles that can improve rough-terrain performance while maintaining conventional vehicle dimensions.

[Conventional technology]

Conventionally, scooter-type motorcycles and tricycles have been constructed by bending the front side of the seat of the vehicle body downward and attaching a footrest to the bent part.The footrest is placed at a low position to facilitate getting on and off. In addition to securing a wide foot space to make the riding position comfortable (for example, Japanese Patent Laid-Open No. 59-63280, Japanese Patent Laid-Open No. 62-34)
(See Publication No. 877). In addition, such scooter-type motorcycles and tricycles are generally intended for easy driving over short distances on paved roads in urban areas.
They are often designed to be relatively compact to ensure easy handling, so the front and rear wheels are also relatively small in diameter, and the distance between the axles is short.

Incidentally, in recent years, there has been a demand for motorcycles and tricycles that have high rough-terrain performance so that they can be used for sporty driving on rough terrain, and models with improved rough-terrain performance are also desired for scooter-type motorcycles and tricycles.・The conventional scooter-type motorcycles and tricycles mentioned above are not intended for such rough terrain ("), so their ability to travel on rough terrain is naturally low.

[Problem that the invention seeks to solve]

In order to improve the above-mentioned ability to travel on rough terrain, it is conceivable to make the front and rear wheels larger in diameter and wider than the wheels of the above-mentioned conventional scooter-type motorcycles and tricycles. However, if such large-diameter wheels are used and the space for foot space is to be secured, the distance between the axles must be increased by the size of the large-diameter wheels, which increases the vehicle dimensions. The ease of handling of the above-mentioned scooter-type motorcycles and tricycles may be impaired.

The present invention was made in view of the above situation, and it is possible to significantly improve the running performance on rough terrain, while maintaining the conventional axle distance, that is, maintaining the vehicle dimensions appropriate for a scooter. Scooter type automatic 2 that can secure space,
The purpose is to provide tricycles.

[Means for solving problems]

The present invention provides a scooter in which a footrest is disposed above a footrest support that is bent below the vehicle body frame, and an engine unit is pivotally supported behind the footrest support so as to be able to swing up and down. For motorcycles and tricycles, front and rear wheels with large-diameter and wide tires are used, and the footrests mentioned above are mounted on the front and rear wheels.
The engine unit is characterized in that it is positioned higher than the line connecting the axles of the rear wheels, and that the front end of the engine unit is pivoted near the axis of the footrest support.

Here, the wheels with large diameter and wide tires in the present invention are:
Compared to conventional wheels for scooter-type motorcycles and tricycles (for example, in the case of a displacement of 50 cc, the outer diameter is 400 w x width 75 fl), the wheels are larger in diameter and 2 wider (in the case of the same displacement, the outer diameter is 490 m x 1).
(approximately 20 W), and is appropriately selected depending on the intended use, level of rough terrain performance, etc.

[Effect]

In the scooter type motorcycle or tricycle according to the present invention, the large diameter 1
The use of wheels with wide tires improves rough terrain performance. However, as shown in FIG. 3, when a large-diameter wheel W' is used and an attempt is made to maintain the inter-axle path HD as before, the front of the foot rest.

In order to avoid interference with the tires, the rear rising parts A and B are made smaller than when using small-diameter wheels, A' and B', respectively.
The foot space is changed from C to C.
’ is pressured. In contrast, in the present invention, the footrest is made higher than the line connecting the front and rear axles, so the front of the footrest
The rear rising part is moved back to A' and B' according to the large diameter wheels,
While moving forward, the same foot space E as before can be secured.

That is, since the footrest generally has an inverted trapezoidal shape in which the distance between the front and back of the lower part is shortened, if the height of the footrest is the same as before, the front and rear rising portions will recede.

The footrest space becomes narrower as the footrest moves forward, but since the footrest of the present invention is located at a high place with a long front-to-back distance, it absorbs the moving bones of the front and rear risers and maintains the same space as before. Can be done.

In addition, if the engine unit is pivoted in the middle of the rear rising part B' of the footrest, the rising part B' is retracted upward, making it difficult to secure space for supporting links, etc. Therefore, after this, the rising portion B' is forced to move further forward, and the footrest space E becomes narrower. However, in the present invention, the rear rising portion B is pivoted near the axial center height of the footrest support portion of the vehicle body frame, that is, at the lower end where it is easy to secure a space for the above-mentioned links, etc.
′ does not need to be moved further forward, and from this point of view as well, the footrest space can be secured.

In addition, in the present invention, as mentioned above, there is no need to extend the distance between the axles in order to secure foot space, so while adopting large diameter and wide wheels, the vehicle is suitable for scooter-type motorcycles and tricycles. Dimensions can be maintained and the same handling properties as before can be ensured.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are diagrams for explaining a scooter type motorcycle according to an embodiment of the present invention.

In the figure, l is a scooter type motorcycle, of which a steering shaft cylinder 3 is fixed to the front end of a body frame 2, and the steering shaft cylinder 3 is fixed to the upper ends of left and right forks 4a. A steering shaft 4b is pivotally supported. A front wheel 5 equipped with a large diameter and wide tire 5a is rotatably supported by an axle 6 between the left and right forks 4a. In addition,
The large diameter 1 wide tire of this example is the conventional displacement 50c
The tires used on scooter-type motorcycles of size C are
It is about 400 cranes in diameter x 75 cranes in width, whereas it is about 490 m in diameter x 120 tm in width with the same displacement.

Further, a steering handle 7 is fixed to the upper end of the steering shaft 4b, a front half part 8a of a leg shield is attached to the front side of the steering shaft cylinder 3, and a fender part 8b is integrated with the lower end of this. It is formed.

The main pipe 9 of the vehicle body frame 2 is connected to the steering shaft cylinder 3.
It consists of a front rising part 9a extending rearward and diagonally downward, and a main support part 9b extending rearward substantially horizontally from the lower end of the front rising part 9a. Side support parts 10a of a pair of side pipes 10 are arranged on the left and right sides of the main support part 9b, and the front ends of the side support parts 10a are fixed slightly above the bent part of the main pipe 9. ing. Further, at the rear end of this side support portion 10a, a rear rising portion 10b extending rearward and diagonally upward is formed following this, and a seat rail portion 10C is further formed.

A rear half 8C of the leg shield is disposed behind the front rising portion 9a of the vehicle body frame 2. Further, a footrest 19a is provided above the main and side support portions 9b and 10a, and an under cowl 19 is provided below this.
b is arranged, and this under cowl 19b and footrest plate 19a are on the left.

They are joined on the right side, and both form a box shape. Further, a seat 11 is mounted above the seat rail portion 10c, and a side cover 12 is mounted below the seat 11.
surrounded by

An engine 13 is located below the side cover 12.
A and a transmission case 13b are integrated into an engine unit 13, and at the rear end of the transmission case 13b, a rear end 14 is mounted with two wide tires 14a having the same large diameter and width as the front wheels 5, and the rear end 14 is an axle. It is pivoted at 15. Further, the front end portion of the engine unit 13 is pivotally supported by a pivot shaft via a link 16 near the lower end of a support bracket 17 fixed to the left and right rear rising portions tab.

In this manner, the engine unit 13 is pivotally supported at the height of the axes of the main and side support portions 9b and 10a of the vehicle body frame 2. This main again.

The axes of the side support portions 9b and 10b are aligned with the front and rear wheels 5.
The footrest 19a is located higher than the straight line connecting the 14 axles 6.15, and therefore the footrest 19a is located higher than this straight line.

Next, the effects of this embodiment will be explained.

In the motorcycle 1 of this embodiment, the front has a large diameter and a wide width.

Equipped with a 5.14 rear wheel, it can improve running performance on rough terrain. If large-diameter wheels are adopted while maintaining the distance between the axles, as mentioned above, the front and rear rising parts of the vehicle body frame will protrude inward due to the increased diameter of the wheels. In contrast, in this embodiment, the main, side support portions 9b, and
10a is set higher than the straight line connecting the front and rear axles 6.15 (that is, the footrest 19a is placed at a higher point where the distance between the front and rear rising parts 9a and 10b is wider, so that the front and rear axles 6.15 The protrusion of the rear rising portions 9a and 10b can be canceled out, and the same footrest space as before can be secured.

In addition, since the footrest 19a is placed at a high place in this way,
Along with this, the position of the under cowl 19b is also high.
In other words, the road clearance, which is the distance between the vehicle and the road surface, can be greatly increased, and from this point of view as well, the rough terrain performance can be improved.

Further, as described above, since the rear rising portion 10b of the vehicle body frame 2 is inclined upwardly and rearward, if the engine unit 13 is pivoted in the middle of the rear rising portion 10b, the link 16 etc. can be disposed. This makes it difficult to secure a space for the footrest, which forces the rising portion 10b to protrude further forward, and there is a risk that the above-mentioned footrest space will become narrower from this point on. In contrast, in this embodiment, the engine unit 13 is pivoted at the same height as the main and side support parts 9b and 10a, that is, at the part where the rear rising part 10b is located furthest forward, so the above problem does not occur. You can secure space for your feet.

Furthermore, when driving on rough terrain, a sudden start or stop causes a large load to be applied to the vehicle body frame 2, especially from the rear wheels 14 through the engine unit 13. support part 9b,
Since the supporting parts 9b and 10a are pivoted at the same height, the large load acts along the axial direction of both the supporting parts 9b and 10a, and as a result, the rigidity of the vehicle body frame can be improved.

In addition, in the above embodiment, the footrest plate 19a of the vehicle body frame 2
In addition to the main and side support parts 9b.

Although 10a is also made higher than the straight line, in the present invention, at least the footrest [19a] need only be made higher than the straight line, and the above-mentioned effects can be obtained depending on this height. Furthermore, the present invention is of course applicable not only to motorcycles but also to scooter-type tricycles.

C Effect of invention] As described above, the scooter type automatic 2 according to the present invention.

According to the tricycle, the footrest is located higher than the straight line connecting the front and rear axles, and the engine unit is pivoted at approximately the same height as the footrest support of the vehicle body frame, so the distance between the axles is reduced. This has the effect of securing foot space without increasing the length of the vehicle, and maintains vehicle dimensions that are easy to handle as a scooter-type two-wheeled vehicle or three-wheeled vehicle while improving off-road performance.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts of a scooter-type motorcycle according to an embodiment of the present invention, FIG. 2 is a side view of the motorcycle, and FIG.
The figure is a schematic diagram for explaining the present invention in detail. In the figure, 1 is a scooter type motorcycle, 2 is a body frame, 3 is a steering shaft cylinder, 5.14 is a front and rear wheels, 6.15 is a front and rear axle, 9b and 10 are footrest plate supports, 13 is an engine unit, 18 is a pivot shaft, and L12 is a footrest. Patent applicant Yamaha Motor Co., Ltd. agent Patent attorney Tsutomu 113

Claims (1)

[Claims] (1) A footrest plate support part is bent downward between the steering shaft cylinder of the vehicle body frame and the seat mounting part, and the footrest plate is arranged above the footrest plate support part, and the footrest plate support part is bent downward. Scooter type motorbikes and tricycles have an engine unit pivoted behind a plate support so that it can swing up and down, and front and rear wheels with large diameter and wide tires are mounted on the front and rear axles. , the footrest is located at a higher location than a line connecting the front and rear axles, and the engine unit is pivoted near the axial height of the footrest support of the vehicle body frame. Scooter-type motorcycles and tricycles.