CN1047561C - Frame structure of small motorcycle - Google Patents

Abstract

The purpose of the present invention is to provide a small motorcycle frame structure that can increase the actual volume of the parts required for the vehicle body near the bottom plate, and realize the simplification and light weight of the frame.

On the bottom plate (14a) near the middle part of the car body, the front and back of the required parts 51 of the car body are provided with the protruding parts (24, 25, 56, 57), which protrude downward from the vehicle frames (22, 23) provided on both sides of the required parts of the vehicle body.

Description

Frame structure of small motorcycle

The invention relates to a frame structure of a small motorcycle.

In small motorcycles, fuel tanks and other required parts of the car body are usually arranged on the base plate near the middle part of the car body, and the vehicle frame passes below these required parts of the car body (see Japanese Patent Laying-Open No. 57-160785 ).

However, in the above-mentioned existing motor scooter frame structure, since the vehicle frame passes through the bottom of the vehicle body floor, parts such as the vehicle frame and the fuel tank are stacked up and down, which limits the volume of the fuel tank and the like. In addition, the structure of the vehicle frame itself becomes complicated, and its processing is time-consuming and troublesome.

In view of the above situation, the object of the present invention is to provide a small motorcycle frame that increases the actual volume of parts required for the vehicle body in the vicinity of the bottom plate, and simplifies and reduces the weight of the frame.

In order to realize the purpose of the present invention, the front and back of the required parts of the car body placed on the bottom plate near the middle of the car body are provided with protruding parts made of rigid materials whose lower ends are located at the lower side of the required parts of the car body. The vehicle frames on both sides of the required parts of the body protrude downward.

In this way, since the required components of the vehicle body do not overlap with the vehicle frame in the up-down direction, the components required for a very large vehicle body can be accommodated. Moreover, since the shape of the vehicle frame itself does not need to be made to pass through the lower part of the floor of the vehicle body, the simplification and weight reduction of the vehicle frame itself are realized.

Fig. 1 is the integral side view of the two-wheeled motorcycle of the present invention;

Fig. 2 is the top view of this motorcycle;

Figure 3 is an enlarged side view of the bottom plate portion;

Figure 4 is an enlarged side view of the front part of the power assembly;

Figure 5 is a side view of the main bracket part;

Fig. 6 is a bottom plate sectional view along line A-A in Fig. 3;

Fig. 7 is a sectional view of other important parts on the bottom plate.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In Fig. 1, label 1 is the vehicle frame extending from the front portion of the car body (left side in the figure), 2 is the engine, 3 is the power transmission device, and 4 is the rear wheel (drive wheel) on which the tire 4b is loaded onto the wheel rim 4a. ), by the engine 2, the power transmission device 3 and the rear wheel 4 form a set of power assembly 5 together. The power assembly 5 is swingably connected up and down through a connection mechanism 6 located at the rear of the vehicle frame 1 , and is supported on the vehicle frame 1 through a suspension 7 .

In addition, among Fig. 1, 9 is a handlebar, 10 is a front wheel on which a tire 10b is mounted on a wheel rim 10a, 11 is a front fork mounted on a vehicle frame 1 to support the front wheel 10, and 12 is a switchable set connected with a hinge Vehicle seat, 13 is the box that is arranged on the direction that holds helmet under vehicle seat 12, and 15 is the cover that is covered on vehicle frame 1 and fuel tank etc., and 16 is the rear fender that slant cover is on trailing wheel 4 rear tops, The 17th is a battery, the 18th is a lubricating oil tank, and the 19th is an exhaust pipe.

The above-mentioned vehicle frame 1 includes a front fork tube 21, a vertical tube 22 extending obliquely downward from the bottom of the front fork tube 21, and a vertical tube 22 whose lower end is slightly bent backward, and connected slightly upward under the vertical tube 22, and from there The side frame 23 made of the tubular material that is separated from the left and right is approximately horizontal and extends backward to the front portion of the seat, and then tilts backward and upward. The side frame 23 also functions as an air flow passage for supplying cooling air to the engine 2 and supplying air to the air cleaner 32 as will be described later.

That is, the lower end of the vertical pipe 22 is connected to the middle part of the horizontal pipe 24, and the two ends of the horizontal pipe 24 are connected to the above-mentioned side frames 23 extending obliquely upward from left to right. The rear end of the side frame 23 bottom plate portion is connected with a U-shaped horizontal tube 25 when viewed from the front, and a connecting short tube 26 is respectively arranged on the left and right sides of the concave horizontal part 25a of the horizontal tube 25 . The connection short pipe 26 communicates with the inside of the chain case of the engine 2 via a conduit 27 . Thereby, the air inhaled by the air inlet that vertical pipe 22 upper end rear parts is provided passes through cross pipe 24, and side frame 23, cross pipe 25, connecting short pipe 26, conduit 27 flow in the chain case of engine 2.

In addition, reference numeral 35 is an opening provided in the vehicle body cover 15, and this opening constitutes an air intake portion of an air cleaner 32 to be described below. Inside the opening 35 rear portion of the vehicle body cover 15, a conduit 36 connecting the opening 35 is installed. Then, be provided with another connecting short pipe 31 (seeing Fig. 2 ) at the oblique front and lower side where the connecting short pipe 30 of the side frame 23 is installed. The connecting short pipe 31 is connected to the air inlet of the air filter 32 through a flexible conduit 41 . Since the air cleaner 32 is made up of the air cleaner housing 43, the cover 44 and the cleaning elements installed therebetween, the air cleaner housing 43 passes through the bolts and the power on the upper bracket of the power assembly 5. Component 5 is installed and fixed as a whole. Therefore, the outlet of the air cleaner 32 is connected to the carburetor 50 and the above-mentioned engine 2 arranged in the downstream direction through the conduit 49 .

The air that enters from above-mentioned opening 35 flows into duct 36, then imports side frame 23, flexible duct 41, air filter 32, as shown by the arrow in the figure, from the unclean side that the inner side of cover 44 forms to through cleaning element The clean side in the air cleaner housing 43 (shown in FIG. 2 ) is then fed into the carburetor 50 via conduit 49 where it is mixed with fuel and fed into the engine 2 .

As shown in FIG. 3 , the outer peripheral flange 51a of the fuel tank 51 is fixed to the bottom plate 14a in the approximate middle of the vehicle body by bolts 52a and nuts 52b mounted on the bracket 23b of the side frame 23 . The fuel tank 51 includes a tank body 52 and a tank cover 53 sealed thereon. A fuel injection port 54 is arranged at the rear portion of the tank cover 53, and the place is sealed by a plug 55.

The fuel tank 51 is surrounded by the above-mentioned side frame 23, the vertical pipe 22 and various parts installed on the vehicle frame 22,23. That is, the lower front portion of the tank body 52 of the fuel tank 51 forms a concave portion 52c, where the horizontal pipe 24 disposed at the lower portion of the above-mentioned vertical pipe 22 is embedded. And the fuel tank 51 side up and down direction middle part is surrounded by the above-mentioned left and right side frame 23 that is arranged outside it, and the side front and bottom of the fuel tank 51 is blocked by the bracket 56 that is welded on the side frame 23 . And the rear portion of the fuel tank is surrounded by the above-mentioned U-shaped horizontal pipe 25 that traverses between the above-mentioned side frames 23 . Moreover, protruding pieces 57 , which are triangular in plan view as shown in FIG. 2 , are provided at approximately the middle part of the horizontal tube 25 at intervals from left to right. The lower ends of the above-mentioned standpipe 22, the lower ends of the horizontal pipes 24, 25, the lower ends of the bracket 56 and the protrusion 57 are all located below the lower end of the fuel tank 51, thereby determining the size of each component. And, the lower cover is screwed on the bolts 59 provided on the left and right brackets of the front part by screwing the nuts 59a from the outside in the form of covering the lower side of the side frame 23, the horizontal pipes 24, 25, the bracket 56 and the protruding piece 57. 58 is fixed, and the lower cover 58 rear portion is installed on the car body by screwing on the nut 61 on the bolt 61a that is provided with on the bracket 60 of the side frame 23. Furthermore, the lower cover 58 is also provided with an opening 58 a corresponding to the lower part of the bracket 56 to connect with the bracket 56 . In addition, the horizontal pipes 24 , 25 , the bracket 56 , and the protrusion 57 are made of high-rigidity materials such as the same steel as the vertical pipe 22 and the side frame 23 . Furthermore, the lower bottom surface of the fuel tank 51 is located above the line D connecting the bracket 56 and the protruding piece 57, which indicates the unevenness of the road surface.

As shown in Fig. 4 and Fig. 5, at the lower part of the front end of the above-mentioned power assembly 5, a bracket 70 that is free to rotate around the pin 71 protruding from the power assembly 5 is installed, and the bracket 70 is connected to the power assembly by means of its upper hook 70a. The spring 72, which is tensioned between the spring hooks 5a formed on the 5, tends to rotate counterclockwise during the erection process, and tends to rotate clockwise during the retraction process.

In addition, an arc-shaped stopper 73 is formed at the front of the bracket to connect with the power assembly 5 and limit the counterclockwise rotation of the bracket 70 in the upright state. The stopper 73 is embedded in the recess 56 formed on the power assembly 5 in contact with its inner surface. And 74 is the rubber stopper that is provided with on support 70, and 75 is the pin lock that is used for support locking, and 76 is starting pedal.

Because, in the miniature motorcycle frame of above-mentioned structure, the outside of fuel tank 51 is provided with the side frame 23 that blocks this fuel tank 51, and cross tube 24,25 and bracket 56, protruding part 57 that are placed on it, like this Just make the fuel tank 51 not overlap in the up and down direction with respect to the side frame 23 etc., and make the height above the base plate 14a of limited height be utilized to the greatest extent, thereby can dispose the fuel tank 51 with larger capacity.

And, because the side frame 23 itself does not need to have a curved shape to cover the fuel tank everywhere, but forms a shield to the fuel tank by welding other parts on the side frame 23, therefore, the structure of the side frame 23 is simplified , as a result, the purpose of easy manufacture and light weight has been achieved.

In the above-mentioned embodiments, the required components of the vehicle body arranged on the bottom plate 14a in the approximate middle of the vehicle body are, for example, the fuel tank, but this should not be limited to the required components. For example, batteries and lubricants may also be used. fuel tank and other components.

According to the above description of the present invention, it can be seen that the required components of the vehicle body and the vehicle frame do not overlap in the vertical direction, so that the volume of the required components of the vehicle body that can be accommodated increases. In addition, the shape of the frame itself does not have to pass through the bottom of the vehicle body, so as to achieve a good effect of structure simplification and light weight.

Claims (1)

1. motor scooter, comprise, be located near the required parts of car body (51) on the base plate of car body middle part, extend an opposite side frame (23) of coming and about the required parts of this car body (51), rearward extending along the direction of cardinal principle level in the expansion with the place ahead from above-mentioned car body, the body frame structure for automotive of this kind motor scooter is characterised in that

Described limit frame (23) is located near the upper wall portions of the required parts of above-mentioned car body (51); so that the required parts of above-mentioned car body (51) bloat downwards from above-mentioned limit frame (23); and include in the front and back of the required parts of above-mentioned car body (51) at least and have respectively than the more downward side-prominent lower end of the required parts of above-mentioned car body (51); the prodger of making by rigid material (57; 57); be provided with lower cover (58) in the below of the required parts of above-mentioned car body (51); this lower cover with respect to carriage (56; 56) position of bottom is provided with opening (58a; 58a); so that carriage (56) is pressed close to lower cover, thereby can play the effect of the protection member that serves as the required parts of above-mentioned car body (51).

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