JPS6092995A - Frame structure of car for travelling on wasteland - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a frame structure of a vehicle for running on rough terrain, in which two front steering wheels are steered by a bar handle.

(Prior Art) In rough terrain vehicles such as four-wheeled vehicles in which two front steering wheels are steered by bar handles, a large force is usually applied to the bar handles to tilt the vehicle body to the left or right in order to turn. Particularly when wide ultra-low pressure tires are installed on each wheel, the vehicle body tends to tilt left and right, and the force applied to the bar handle becomes considerably large.

In this type of conventional vehicle, a pair of left and right upper tubes that support the straddle-type driver's seat are lowered in front of them and fixed to the front axle, and the upper part of the steering shaft is supported by a reinforcing member that connects these upper tubes. is configured to do so. The supporting force of the bar handle and steering shaft, as well as the large bending moment that the front axle receives from the road surface, tends to concentrate on the front part of the frame, so the front part of the frame is required to have sufficient strength and rigidity. In a structure that is reinforced with reinforcing members, the number of reinforcing members increases, which not only increases the number of parts, but also causes the disadvantage that the front part of the frame becomes larger.

(Objective of the Invention) The present invention was made in view of the above circumstances, and provides a vehicle for running on rough terrain that has sufficient strength and rigidity with a small number of reinforcing members, and that can be compactly assembled near the front of the frame. The purpose is to provide a frame structure for

(Structure of the Invention) In order to achieve the object of the present invention, there is provided a sideways front axle that connects two front steering wheels, and a pair of left and right front tubes that extend upward from the front axle and come together at the upper end.

The front axle and both front tubes form a substantially triangular shape, and there is a main tube extending rearward from the gathering part at the upper end of both front tubes. It is configured to support a part of the moving steering shaft. The present invention will now be described in detail based on the illustrated embodiments.

(Example) Figure 1 shows the perspective view of a four-wheeled vehicle that is an example of the present invention.
The figure is a perspective view of the frame, FIG. 3 is a side sectional view of the vicinity of the front upper part of the vehicle body, and FIG. 4 is a sectional view taken along line N--N.

In FIG. 1, reference numeral 10.10 is a steering front wheel, 12 is a driving rear wheel, and only one rear wheel 12 is visible.

These front and rear wheels 10.12 have wide ultra-low pressure tire fenders, 18 is the engine mounted near the center of the vehicle, and 20
22 is a fuel tank located above the engine, and 22 is a straddle-type driver's seat behind it.

30 is a frame, with a horizontal front axle 3 at the front lower part of the frame;
A front wheel 10.10 is attached to 2 so that it can be steered left and right. 34 (34a, 34b) is a front tube, 36 is a main tube, and the lower end of the front tube 34 is connected to the front axle 32.
Its upper end converges with the main tube 36. As a result, the front axle 32 and both front tubes 34 form a triangle when viewed from the front. From the front axle 32 to the rear - a pair of left and right lower tubes 38 (38a, 38b) (7)
H, 'c(D rear end is fixed to the horizontal pipe 40.

This horizontal tube 40 and the rear end of the main tube 3G are connected by a rear tube 42 (42a, 42b). Further, the center of a horizontal tube 44 connecting the lower tubes 38 and the front lower surface of the main tube 36 are connected by a vertical tube 46.

G-trays 48 (48a, 48b) extend rearward from both rear standing tubes 42, and a rear tube 50 (50
a, 50b). Back standing tube 42
The lateral tube 52 fixed between a and 42b and each rear tube 50 are connected by a tube 54 (54a, 54b) as a tail.

The rear tube 50 has a bracket 56 (56a).

56b) is fixed so as to be suspended, and this bracket 56 and the horizontal tube 40 are connected to the tubes 58 (58a, 58
b) are connected. An axle (not shown) of the rear wheel 12 is fixed to the bracket 56.

and the front surface of the upper end of the front tubes 34a, 34b.

A bracket plate 60 is fixed to the front end surface of the main tube 36, and this bracket plate 60 extends upward from the main tube 36 (see FIG. 3). A bracket 62 curved (FIG. 4) so as to have a substantially triangular side surface (FIG. 3) is fixed between the upper rear surface of the bracket plate 60 and the upper surface of the main tube 36. This bracket 62 reduces the force transmitted from the front axle 32 to the front tube 34 through the bracket plate 62.
0 to the upper surface of the main receiving tube 36, and has the effect of dispersing the stress at the gathering part (2, F) at the upper end of the front tube 34.

Also, air intake ports 64 are provided on the left and right sides of this bracket 62.
．． 64 is open, and an air intake port 66 located inside this bracket 62 is also opened on the upper surface of the main tube 36. In the vehicle of this embodiment, the main tube 36 is used as a part of the intake pipe, and the outside air taken in from the air intake ports 64 and 66 is guided rearward through the main tube 36, and is connected to the rear end opening of the main tube 36. It is designed to lead to an intake air purifier (not shown). The fuel tank 20 is mounted so as to straddle the main tube 36 and the bracket 62 (FIG. 4). Therefore, it is difficult for rainwater or muddy water to enter the air intake port 64 while driving on a rough road. Note that 68 is an eave-shaped cover attached to this air intake port 64,
This cover 68 has the effect of making it more difficult for water droplets to enter the main tube 36.

In FIGS. 1 and 2, 70 is a steering axis. This steering shaft 7
0 is rotatably held by a bracket 72 protruding from the central front surface of the front axle 32, and an upper portion by the front surface of the bracket plate 60. A bar handle 74 is fixed to the upper end of the steering shaft 70, and its rotation is controlled by a pitman arm, tie rod, and knuckle arm (all not shown).
It is transmitted to the front wheels 10 by a known steering mechanism using, for example.

80 is a duct for running wind income, fuel temperature: 1 tank 2
It is attached from the front of the steering shaft 7o so as to cover the front lower part of the steering shaft 7o. This duct 80 is formed with an air intake port 82 (only one side is shown in the figure) that opens forward from the direction of the steering axis 7o, and the air intake port 82 (only one side is shown in the figure) directs running air to the fuel tank 20 and the main tube 3.
Through the gap between 6 and 6.

It leads to the air intake 64 and the engine 18.

According to this embodiment, the front tube 34 and the main tube 3
Bracket plate 60. The bracket 62 is provided to disperse stress, and the bracket 60 is used to provide an air intake port 64.

Water droplets are less likely to enter the engine intake. In addition, since the gathering part is narrow and compact, it is possible to better guide the running wind to the lower part of the fuel tank, improving engine cooling performance. Also, since the front part of the frame 30 has a triangular shape when viewed from the front, its strength and rigidity are extremely high, and it can withstand the lateral force applied to the steering shaft 70 from the handlebar 74 side and the large bending moment applied to the front axle 32. It can be a frame.

(Effects of the Invention) As described above, in the present invention, the front tube that stands up from the front axle is assembled at the front end of the main tube, so that the front tube and the front axle form a substantially triangular shape when viewed from the front. Lateral strength of the front of the frame.

The rigidity is greatly increased, and it becomes possible to obtain sufficient strength and rigidity to withstand the impact of the front wheels and steering wheel without having to attach many reinforcing members. Therefore, the effect of reducing the number of frame component parts can also be obtained. In addition, since the area near the gathering part can be made small and compact, it is convenient to take in engine cooling air from this area.

[Brief explanation of the drawing]

The first factor is a perspective view of an embodiment of the present invention, FIG. 2 is a perspective view of the entire frame, FIG. 3 is a side sectional view of the main parts of the vehicle body, and
The figure is a sectional view taken along the line ■-IV. 10...Front wheel, 30...Frame. 32...Front axle, 34...Front tube. 36...Main tube, 38...Lower tube. 70... Steering N, 74... Bar handle. Patent Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Yama 1) Letter Yu Figure 4 Procedural Amendments Stamped November 21, 1982 Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of Case 1988 Patent Application No. 200001 2 Name of the invention Frame structure of a vehicle for traveling on rough terrain 3 Relationship with the case of the person making the amendment Patent Applicant Address 2500 Shingai, Iwata City, Shizuoka Prefecture Name (AO7) Yamaha Motor Co., Ltd. Representative Jiang
Hideto Kuchi 4, Agent address: 6-21 Nishi-Shinbashi 1-chome, Minato-ku, Tokyo Number of inventions to be increased by the amendment: 0 7, Specification subject to the amendment and drawings 8, Description of the contents of the amendment and drawings Make an imprint.

Claims (1)

[Claims] A sideways front axle that connects the two front steering wheels, a pair of left and right front tubes that extend upward from the front axle and meet at the upper end, and a main tube that extends rearward from the meeting point at the upper end of the two front tubes. The front axle and both front tubes form a substantially triangular shape when viewed from the front, while the upper part of the steering shaft, which rotates together with the bar handle, is supported near the gathering part. Frame structure of a vehicle for running on rough terrain.