JPH0788193B2 - Motorcycle frame - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a motorcycle, and more particularly to a structure for mounting a footrest as a footrest of an occupant on a frame thereof.

[Technical background of the invention and its problems]

Generally, in a motorcycle for two passengers equipped with a tandem seat, a rear footrest for footrest of a passenger may be extended rearward from a bracket for attaching a footrest for a driver, and may be attached to an extended end of this bracket. Has been done.

However, according to such a structure, the size of the entire bracket is increased and the bracket is required to have high rigidity and mechanical strength. Therefore, it is necessary to use a cast product such as aluminum. Therefore, the bracket itself becomes heavy and large, which leads to an increase in vehicle weight and a high cost.

[Object of the Invention]

The present invention has been made based on such a situation, and it is possible to reduce the size and weight of a bracket for mounting a footrest, and moreover, the load on the mounting portion of the bracket can be small and the strength can be improved. In addition to being advantageous in terms of surface, the bracket can be attached to and detached from the main frame structure integrally with the auxiliary frame structure, and the rear stay that reinforces the mounting portion of the bracket is
An object of the present invention is to provide a frame for a motorcycle that can be used as a member for winding a rope for loading or as a grip for a passenger, and is excellent in usability.

[Outline of Invention]

In order to achieve the above object, a frame of a motorcycle according to the present invention has a front fork pivotally supporting portion at a front end portion thereof, and a rear arm pivotally attaching portion extending rearward at a rear end portion thereof, and the front fork and A main frame structure in which an engine is mounted between the rear arm and a rear seat of the main frame structure, which extends rearward, includes a first seat for a driver and a second seat for a passenger. It is installed between the seat rails that are placed side by side in the front-rear direction, the vicinity of the pivot portion of the main frame structure and the rear portion of the seat rail, and is inclined upward as it goes rearward from the vicinity of the pivot portion. An auxiliary frame structure having a back stay and a side cover that covers the auxiliary frame structure, and the lower edge of the auxiliary frame structure is inclined upward as it goes backward. It is and a compartment cover.

The auxiliary frame structure is detachably connected to the main frame structure, and a bracket is welded to the back stay of the auxiliary frame structure, the bracket extending downward and the lower end of the auxiliary frame structure protrudes from the lower edge of the side cover. Then, a rear footrest for placing a passenger's feet is attached to the lower end of the bracket, and a rear stay is welded between the bracket and the rear end of the backstay. Below the seat, and near the lower edge of the side cover,
It is characterized in that it is provided with a stay body extending along the front-rear direction.

Example of Invention

The present invention will be described below based on an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 is a frame constituting a vehicle body of a motorcycle, and a steering head pipe 2 located at a front end of the frame has left and right tank rails 3, 3 extending rearward.
And the left and right down tubes 4, 4 extending downward and rearward are welded.

The rear ends of the tank rails 3,3 and the down tubes 4,4
They are connected to each other via rear arm brackets 5, 5, which are the steering head pipe 2 and the tank rail.
3,3, down tube 4,4 and rear arm bracket 5,
The mainframe structure 6 is composed of 5. The main frame structure 6 is located in the front half of the frame 1.

A front fork 7 is pivotally supported on the steering head pipe 2, and a rear arm 8 extending rearward is pivotally mounted between the rear arm brackets 5, 5. Therefore, in the case of the present embodiment, the steering head pipe 2 constitutes the pivotal support portion of the main frame structure 6, and the rear arm brackets 5, 5 are the rear arms 8.
Constitutes the pivot point of the.

The rear arm 8 has a rear wheel 9 pivotally supported at the rear end thereof. Between the rear wheel 9 and the front end pivotally connected portion of the rear arm 8, a single hydraulic shock absorber 10 for suspending the rear arm is arranged in a substantially upright posture.

Further, in the space portion surrounded by the tank rails 3, 3, the down tubes 4, 4, and the rear arm brackets 5, 5,
A parallel multi-cylinder engine 11 is installed. This engine
Multiple exhaust pipes 12 derived from each of the 11 cylinders
After being gathered together under 11 and connected to a muffler 13, the muffler 13 is led to one side of the rear arm 8.

A fuel tank 14 is installed on the tank rails 3 and, and footrest stays 15 and 15 bolted to the rear portions of the rear arm brackets 5 and 5 are provided with a footrest 16 as a footrest for the driver. , 16 are attached.

On the other hand, an auxiliary frame structure 17 extending rearward above the rear arm 8 is detachably connected to the rear portion of the main frame structure 6 as described above. As shown in FIGS. 2 and 3, the auxiliary frame structure 17 includes left and right seat rails 18, 18 extending rearward from rear portions of the tank rails 3, 3.
And left and right back stays 19, which extend from the upper part of the rear arm brackets 5, 5 toward the rear of the seat rails 18, 18.
It has 19 and.

The seat rails 18, 18 and the back stays 19, 19 are inclined upward as they move backward, and the inclination angle of the back stays 19, 19 is larger. The rear ends of the back stays 19 and 19 are welded to the rear lower surfaces of the seat rails 18 and 18, and the front ends of the seat rails 18 and 18 and the back stays 19 and 19 are connected to the tank rails 3 and 3, respectively. It is detachably connected to the rear part and the upper part of the rear arm brackets 5, 5.

Since the seat rails 3 and 3 and the back stays 19 and 19 have the same connection structure, the connection portion between one tank rail 3 and the seat rail 18 will be described as a representative.

As shown in FIG. 4 and FIG. 5, the front end portion of the seat rail 18 forms a flattened connection piece portion 20.
The connecting piece portion 20 is abutted against a seat rail bracket 21 welded to the inner surface of the tank rail 3, and a bolt 22 is inserted through this abutting portion and a nut 23 is tightened to fasten the front end of the seat rail 18. The section and the tank rail 3 are connected.

Therefore, if you loosen the nut 23 and pull out the bolt 22,
The auxiliary frame structure 17 can be separated from the main frame structure 6.

Seat rails that make up such an auxiliary frame structure 17
A first seat 24 for a driver and a second seat 25 for a passenger are placed side by side on the front and back of the 18,18. From the left and right sides of the auxiliary frame structure 17 to the rear side, they are covered with side covers 26, 26 which also function as seat cowls. The lower front ends of the side covers 26, 26 are located beside the connecting portions of the back stays 19, 19 and the rear arm brackets 5, 5, and the lower edge portions 2 of the side covers 26, 26 are located.
The 6a is inclined upward as it goes rearward so as to follow the inclination of the seat rails 18, 18.

Brackets 27, 27 extending downward are welded to the lower surfaces of the intermediate portions of the back stays 19, 19, respectively. The brackets 27, 27 of this embodiment are formed by bending a pipe material into a substantially U shape, and the lower end portions 27a of the brackets 27, 27 are formed.
Is projected below the lower edge portion 26a of the side covers 26, 26, and is located just below the front end of the second seat 25. Left and right rear footrests 29, 29 for passengers are attached to the lower ends 27a of the brackets 27, 27 via support plates 28, 28, and the muffler 13 is mounted on one of the support plates 28. It has been tightened.

Further, rear stays 30, 30 formed by bending a pipe material into an L shape are welded between the rear surfaces of the brackets 27, 27 and the rear end lower surfaces of the back stays 19, 19. Rear stay 30,30
Is for ensuring the mounting strength of the brackets 27, 27, and these rear stays 30, 30 are located below both sides of the second seat 25, as shown in FIG.

The rear stays 30, 30 include stay main bodies 30a. The stay main body 30a extends in the front-rear direction along the lower edge portions 26a of the side covers 26, 26 and is led out below the lower edge portions 26a. Further, a hook 31 for hooking or winding a rope for loading later is provided on the peripheral surface of the lead-out portion of the stay body 30a in a protruding manner.

According to such a configuration, the brackets 27, 27 extending downward are provided at the intermediate portions of the back stays 19, 19 which are inclined rearward and upward.
Weld the rear footrests 29,29 for passengers to the lower end 27a of the brackets 27,27 via the support plates 28,28.
Since it is attached, it is not necessary to extend the footrest stays 15, 15 supporting the driver's footrests 16, 16 rearward as in the conventional case. From this, the footrest stay
Both 15, 15 and the brackets 27, 27 can be made compact, and the weight of the frame 1 can be reduced.

Moreover, since the lower edge portions 26a of the side covers 26, 26 that cover the auxiliary frame structure 17 from the left and right sides are inclined rearward and upward along the inclination direction of the seat rails 18, 18, the brackets 27, 27 are included. Can be made to project below the side covers 26, 26 at a short distance from the back stays 19, 19. Therefore, the total length from the welded portion of the brackets 27, 27 to the back stays 19, 19 to the lower end portion 27a can be shortened, and when the passenger puts his foot on the rear footrests 29, 29, the brackets 27, 27 The bending moment applied to the welded part can be suppressed to a small value.

Therefore, the load on the welded portions of the brackets 27, 27 is reduced, which is also advantageous in terms of strength.

Further, since the rear stays 30, 30 are welded between the rear portion of the brackets 27, 27 and the back stay 19 and the rear end portion, the brackets 27, 27 are supported by the rear stays 30, 30. . Therefore, the welded portions of the brackets 27, 27 are reinforced, and the mounting strength of the brackets 27, 27 can be sufficiently secured.

Then, the rear stay located below the second seat 25
30 and 30 have a stay main body 30a extending in the front-rear direction, and since the stay main body 30a is led out outward along the lower edge portion 26a of the side covers 26, 26, for example, the second seat 25
This rope can be wound around or hooked around the stay main body 30a when fixing the luggage carried on the rope with the rope. Sometimes, if the stay body 30a extends in the front-back direction,
The rope can be wound around or hooked on the stay main body 30a at a plurality of positions along the front-rear direction, and the luggage can be firmly fixed on the second seat 25.

Further, since the stay main body 30a extends in the front-rear direction below the second seat 25, the passenger can use the stay main body 30a as a grip when sitting on the second seat 25. .

Therefore, the rear stays 30, 30 of the auxiliary frame structure 17 can be used as a member for winding a rope or a grip for a passenger, and the usability of the frame 1 is improved. At the same time, since the stay main body 30a of the rear stays 30, 30 is along the lower edge portion 26a of the side covers 26, 26, the stay main body 30a is less noticeable and the appearance can be maintained good.

Moreover, according to the above configuration, the brackets 27, 27 supporting the rear footrests 29, 29 are welded to the back stays 19, 19 of the auxiliary frame structure 17, and the auxiliary frame structure 17 is
Since it is unitized in advance, the auxiliary frame structure 17
Installation of the brackets 27, 27 with respect to the frame 1 is completed by simply attaching the brackets to the main frame structure 6.

Therefore, it is not necessary to separately attach the brackets 27, 27 to the auxiliary frame structure 17, and the frame 1 can be easily assembled by that much.

In addition, it is not necessary to provide a mounting seat for receiving the brackets 27, 27 on the back stays 19, 19 side, and bolts and nuts are not necessary, so that the number of parts of the frame 1 can be reduced accordingly. This will contribute further to the weight reduction of.

Further, when the auxiliary frame structure 17 is detached from the main frame structure 6, the space between the rear arm 8 and the seats 24, 25 is widely opened, so that the hydraulic shock absorber 10 and other parts located at this part are opened. Maintenance and inspection of various functional parts can be performed easily, and maintainability is improved.

In the above-described embodiment, the bracket is made of a pipe material bent in a U shape, but the present invention is not limited to this, and may be made of, for example, a plate-shaped press-formed product.

Further, the main frame structure and the auxiliary frame structure are not limited to the pipe frames, and may be, for example, a press frame using a press molded product.

〔The invention's effect〕

According to the present invention described in detail above, the bracket for supporting the rear footrest is attached to the side cover at a short distance from the back stay of the auxiliary frame structure despite the side frame covering the auxiliary frame structure. It can be projected downward. Therefore, the bracket can be made compact by shortening the overall length, and the frame can be made lightweight.

Moreover, when an occupant puts his / her foot on the rear footrest, the bending moment applied to the weld portion of the bracket becomes small, so the load burden on the weld portion of the bracket is reduced,
It is also advantageous in terms of strength.

Further, since the auxiliary frame structure includes the rear stay welded across the rear portion of the bracket and the rear end portion of the back stay, the bracket is supported by the rear stay. Therefore, the welded portion of the bracket is reinforced, and also in this respect, the mounting strength of the bracket can be sufficiently secured. At the same time, since the stay main body of the rear stay is arranged near the lower edge of the side cover, for example, when the luggage carried on the second seat is fixed with a rope, the rope is wound around or hooked on the stay main body. be able to. In particular, since the stay main body extends in the front-rear direction, the rope can be wound around or hooked on the stay main body at a plurality of positions along the front-rear direction, and the luggage can be firmly fixed on the second seat. Furthermore, if the stay main body extends in the front-rear direction, the passenger can use the stay main body as a grip when sitting on the second seat,
As a result, the usability of the frame is improved. At the same time, since the stay main body is along the lower edge of the side cover, the stay main body is less noticeable and the appearance can be maintained good.

Moreover, since the bracket is welded to the back stay of the auxiliary frame structure and unitized in advance with this auxiliary frame structure, the bracket can be arranged with respect to the frame simply by attaching the auxiliary frame structure to the main frame structure. Complete. For this reason, it is not necessary to separately attach the bracket to the auxiliary frame structure, and accordingly, the frame assembling work can be easily performed. At the same time, it is not necessary to provide a mounting seat for receiving the bracket on the back stay side, and the need for bolts and nuts is eliminated, so the number of parts of the frame can be reduced accordingly, and the weight of the frame is further reduced. There is an advantage of contributing.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a side view of a motorcycle, FIGS. 2 and 3 are side views of the auxiliary frame structure of a frame as viewed from opposite directions, respectively. 2 is an enlarged side view of the IV portion in FIG. 2, and FIG. 5 is a sectional view taken along the line VV in FIG. 1 ... Frame, 2 ... Pivot support (steering head pipe), 5 ... Pivot attachment (rear arm bracket), 6 ... Main frame structure, 7 ... Front fork, 8 ... Rear arm, 11 ... Engine, 17 …… auxiliary frame structure, 18 …… seat rail, 19 …… back stay, 24 …… first seat, 25 …… second seat, 26 …… side cover, 26a …… lower edge, 27… … Bracket, 27a …… Lower end, 29 …… Rear footrest, 30 …… Rear stay, 30a …… Stay body.

Claims (1)

[Claims] 1. A main body comprising a front fork pivotally supporting portion at a front end portion thereof, a rear arm pivoting portion extending rearward at a rear end portion thereof, and an engine mounted between the front fork and the rear arm. A frame structure, and a seat rail that extends rearward from a rear portion of the main frame structure and on which a first seat for a driver and a second seat for a passenger are placed side by side in front and rear, An auxiliary frame structure that is installed between the vicinity of the pivotal attachment portion of the main frame structure and the rear portion of the seat rail, and has a back stay that is inclined upward as it goes rearward from the vicinity of the pivotal attachment portion, The auxiliary frame structure is covered from the side, and a side cover whose lower edge is inclined upward as it goes rearward is provided, and the auxiliary frame structure is In addition to being detachably connected to the main frame structure, a bracket that extends downward and has its lower end protruding from the lower edge of the side cover is welded to this auxiliary frame structure, and is attached to the lower end of this bracket. , A rear footrest for mounting a foot of a passenger is attached, and a rear stay is welded between the bracket and a rear end portion of the back stay, the rear stay being below the second seat and A frame for a motorcycle, comprising a stay body extending along the front-rear direction near the lower edge of the side cover.