JPS5996080A - Frame structure of rear two-wheel car - 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 The present invention relates to a frame structure of a rear two-wheeled vehicle such as a tricycle or a four-wheeled vehicle.
The present invention relates to a frame structure for a rear two-wheeled vehicle in which the rear end portions of the frames are connected by a side frame having a width wider than the spacing between these frames, thereby eliminating the influence of obstacles on accessories.

2. Description of the Related Art Vehicles used for traveling on rough terrain are required to be easily balanced and have good maneuverability when a driver rides on the vehicle. For this reason, two-wheeled vehicles such as tricycles and four-wheelers were developed.

Fig. 1 shows a saddle riding system in which two front wheels 1 and two rear wheels 2 are installed, and each of these wheels 1 and 2 is equipped with a so-called balloon tire 3, which is a tire with low internal pressure and a wide contact surface with the ground. It is a type 4 four-wheeled vehicle. This four-wheeled vehicle 4 uses a bar handle 5 as a handle for operating the steering mechanism of the front wheels 1, and employs a bar step 6 as a step on which the driver's feet are placed. 7 and 8 are a front cover and a rear cover, and a seat 9 is placed on this rear cover 8. The frame structure of this four-wheeled vehicle will be explained with reference to FIGS. 2 and 3. The frame 10 includes a pair of upper frames 1, 1, 1, and 1, respectively. , 112 and lower frames 121, 122, and these upper frames 11. '
+112 and lower frame 1/-12. , 122 at predetermined intervals. Upper frame 11. , 112 bends the tip portion 111 of a certain length diagonally downward and at an angle away from each other, and forms a certain length of an inclined portion 113 that slopes downward at a gentle angle behind the bent portion 112. formed,
The rear end portion 114 behind the inclined portion 113 is horizontally bent (7〈 is slightly upwardly bent. This upper frame 1
1, , 112 are connected to the axle 14 that supports the front wheel 1.
A U-shaped fixing frame is connected by welding or the like, and has a screw hole (not shown) for screwing the spacer frame 131 and the front cover 7 between the tips 111. 15 is installed. The bent portion 112 is provided with a steering head 17 that supports the steering shaft 16 of the bar handle 5.

On the other hand, the lower frames 12+ and 122 are arranged substantially horizontally at equal intervals, and have their tips connected to the axle 14, and have their rear ends 121, which become side frames, bent midway so that they do not stand up. Set the upper frame 11.
, 112, and connected to the rear end portion 114 of the two. thus,
Upper frame 111 r 112% Lower frame 12.
, 122 and each spacer frame] 3, accessories such as an engine 18, a fuel tank 19, a brake drum 2o, and a chain case 21 are arranged as shown in FIG.

However, the fuel tank 19, brake drum holder, and chain case 21 are as shown in FIG.
Upper frame 11. , 112 and lower frame 12
．． , 122, there is a high frequency of direct impact from scattered stones or obstacles such as plants, which may cause damage to the equipment. Furthermore, when attaching a large trailer carrier or trailer sheep to the frame, there is a problem in terms of strength. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a frame structure for a rear two-wheeled vehicle that allows for easy maintenance of accessories and attachment of a rear carrier and the like.

Its characteristics include a pair of upper and lower frames facing each other at a predetermined distance,
The rear ends of the lower frames are connected by a joint member that is longer than the interval between the lower frames, the joint members and the rear ends of the upper frame are respectively connected by a pair of side frames, and the side frames and the joint members are connected to each other by a pair of side frames. The reason for this is that the distance between the side frames is set larger than the distance between the lower frames at the connecting portion.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment, in which the same parts as in FIGS. 1 and 2 are denoted by the same reference numerals.

FIG. 4 shows a frame structure according to one embodiment of the invention, which frame includes a pair of upper frames 22.
, 222 and lower frames 231, 232, and these upper frames 22. , 222 and the lower frame 23. , 232 and a plurality of spacer frame rows that maintain a predetermined distance between each other.

The upper frame 22. , 222 bends the tip portion 221 forward and diagonally downward, and the bent portion 222 is rearwardly bent.
A predetermined length of a sloped portion 223 that slopes downward at a gentle angle is formed, and a rear end portion 224 behind the sloped portion 223 is bent horizontally or slightly upward. This upper frame 22
．． , 222 are connected by the spacer frame 24, and the upper frame 22. , 222 bent portion 222
The steering shaft 1 of the part bundle 5 above is
A steering wheel 17 is provided to support the steering wheel 6.

On the other hand, the lower frames 23+ and 232 have their tips connected to the upper frames 22+ and 222 by a common spacer frame row, and continue to the rear side frame (described later), with the middle part connected to the rear side of step 6. Cut the lower frames 231 and 232 between the cut portions of the frame 23. , 232. They are connected by a joint pipe 5 that is longer than the width. Then, the joint pipe 5 and the rear end portions of the upper frames 221 and 222 are connected by the side frames 26, respectively, and the connecting portions of these side frames with the joint vibro are connected to the lower frame 221 and 222, respectively.
3. , 23. The interval is set to be thicker than the interval between.

On the other hand, the upper frames 22I and 222 joint joint pipes 25 are connected by two main frames n,
A swing arm 4 that supports the drive shaft side shown in FIG. 5 is attached to the main frame 27. In this swing arm machine, one ends of two arms 30 are connected by a support shaft 31, and the support shaft 31 is swingably supported on the main frame n. A support part 33 having a mounting hole 32 is provided at the other end of each arm (equipment) of the swing arm 4.
is provided, and a drive shaft is supported in this mounting hole 32 via a bearing (not shown). Between the other end of the swing arm 29 and the upper frames 22t, 222,
One rear suspension has been installed. Open this rear suspension and connect one end of it to the upper frame 221.
, 222, and a frame (not shown) connected to the spacer frame U that connects the rear end portions 224 of each other.
is connected to.

Next, to explain the steering mechanism for steering the front wheels, the front wheels 1 include a spacer frame row and a lower frame 2.
3. , 232, and is rotatably attached to a U-shaped wheel support frame 35 supported by . This frame includes a spacer frame 24, a lower frame 23%,
Support arms 37 and 38 supported at one end via ball joint 36 at 232 and upper frame 221.2
The front suspension 39 is supported by a front suspension 39 whose one end is supported by the tip 221 of 22. The front wheel 1 is supported by supporting a support vibrator, which is integrally provided on a wheel support shaft (not shown), on a frame using a king pin. The steering shaft 16, which is rotatably supported by the steering head 17, has its lower end rotatably supported by a support portion 40 provided at an intermediate position between the spacer frames.

A link mechanism (not shown) for steering the front wheels 1 is provided at the lower end of the steering shaft, and the front wheels 1 are steered by operating the bar 7 and steering wheel 5.

According to the frame structure having the above configuration, as shown in FIGS. 5 and 6, the fuel tank 19, the brake drum 20, the chain case 21, the crab side frame 26,
Since the equipment is located inside the equipment, it is possible to prevent accidents such as damage caused by direct contact with obstacles.

Also, as shown in FIG. 7, a rear carrier 41. Also, when installing the trailer sheep 42 as shown in Figure 8,
Since the distance between the side frames is wide, it is possible to install large items, which improves the strength when installing.

As described above, according to the frame structure of the rear two-wheeled vehicle according to the present invention, the rear ends of the upper frame and the lower frame are connected by the side frame whose width is wider than the interval between these frames, so that accessories can be easily attached. Can be protected from obstacles. Furthermore, when attaching a rear carrier, etc., it can be firmly attached.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a straddle type four-wheel vehicle, Fig. 2 is a perspective view showing a conventional frame structure of a straddle type four-wheel vehicle, and Fig. 3 is a perspective view showing a straddle type four-wheel vehicle.
FIG. 4 is a plan view showing the arrangement of accessories in the frame structure of FIG. 2; FIG. Figure 6 (d) shows how equipment is arranged in the frame structure of Figure 4, Figure 5 is a plan view, Figure 6 is a rear view, Figures 7 and 8 are views of the frame structure of the present invention. These are perspective views showing other embodiments. 1...-front wheels, 2...-rear wheels,
4...Saddle type four-wheeled vehicle, 22s, 222...
...Top] V-mu, 23%, 232...
Lower frame, U... Frame for spacer, 5... Joint knob, Ni... Side frame 0 Fig. 1 5 Fig. 2 Fig. 31-, J 4 Figure 5 r ---- C Figure 6 7

Claims (1)

[Claims] It has a pair of upper frames and a lower frame that face each other at a predetermined interval, and the rear ends of the lower frames are connected by a joint member that is longer than the interval between the lower frames, and the joint member and the upper frame are connected at the rear ends of the lower frames. The rear end portions are connected by a pair of side frames, and the connection portion between the side frames and the joint member is set so that the distance between the side frames is larger than the distance between the lower frames. Frame structure of two-wheeled vehicles.