JP2671346B2 - Body frame structure for saddle type vehicles - Google Patents

Description

The present invention relates to a vehicle body frame structure of a saddle-ride type vehicle that travels on uneven terrain, and more particularly to a saddle in which a mounting portion of a front cushion unit is improved. The present invention relates to a body frame structure of a riding type vehicle.

(Prior Art) A saddle riding type three-wheeled vehicle or a saddle riding type four-wheeled vehicle, which is said to be a saddle riding type vehicle, is supported by a steering front wheel and a pair of rear wheels having a large tread, and a rear wheel is provided at a rear half portion above the vehicle. A vertically elongated saddle-riding type seat is arranged between the seats, and the rider straddling the seat is driven by the power of the engine while steering the rod handle.

A conventional body frame structure for a saddle-ride type vehicle is, for example, a fifth frame.
As shown in the figure, a pair of left and right front tubes 1 and a pair of left and right lower tubes 2 are connected, and the left and right tubes 1 and 2 are connected by a number of bridge tubes 3. A pair of left and right seat rails 4 are continuously and integrally connected to the front tube 1. The seat rail 4 is reinforced by a seat pillar 5 connected to the lower tube 2. Further, the front tube 1 and the lower tube 2 are connected by a down tube 6, and the seat rail 4 and the lower tube 2 are connected by a body tube 7 for reinforcement.

The upper part of the pair of left and right front tubes 1 is a bracket 8
Connected by. The bracket 8 has a U-shaped cross section, and mounting holes 9 are formed at both ends thereof. The upper portion of the front cushion unit (not shown) is attached to the attachment hole 9. Therefore, the bracket 8 functions as a bridge tube that connects the pair of left and right front tubes 1, and also functions as a mounting bracket for the front cushion unit.

(Problems to be Solved by the Invention) In the layout of the bracket 8, the mounting position of the front cushion unit has a great influence on the performance of the front suspension. Is set to the position. Therefore, the bracket 8 is attached to the upper portion of the front tube 1, and there is a possibility that the bracket 8 becomes an obstacle and the front space between the pair of left and right front tubes 1 cannot be effectively used.

Further, since the bracket 8 functions as a mounting bracket of the front cushion unit, it is necessary to improve rigidity, and therefore, the bracket 8 is robustly manufactured. as a result,
The weight of the bracket 8 increases, and the weight of the entire front body of the vehicle increases.

The present invention has been made in view of the above facts, and an object of the present invention is to provide a vehicle body frame structure for a saddle-ride type vehicle that can effectively use the front space of the vehicle body frame and reduce the weight of the vehicle body frame. .

[Configuration of the invention]

(Means for Solving the Problems) In order to solve the above-described problems, a vehicle body frame structure for a saddle-ride type vehicle according to the present invention has a pair of left and right front cushion units that support a pair of left and right front wheels in a vertically cushionable manner. In a vehicle body frame structure for a saddle-ride type vehicle, the vehicle body frame includes a main bracket that supports a steering shaft for mounting a bar handle, and the vehicle body frame includes a pair of left and right front tubes extending forward and downward from the main bracket, and a center of the vehicle body. A front part of the vehicle body frame and a pair of left and right lower tubes connected to the front tube and extending forward through a lower part of an engine mounted on the front part of the vehicle. , And place it near the connecting part of the above-mentioned front tube and down tube. A pair of left and right mounting brackets that support the upper end of the front cushion unit are fixed to each other, and the upper portions of the down tubes located below the fixing positions of the mounting brackets are connected by a battery mounting connecting bridge.

(Operation) Therefore, according to the vehicle body frame structure of the straddle-type vehicle according to the present invention, the pair of left and right front tubes are connected to the vehicle upper side below the vehicle from the fixing position of the mounting bracket supporting the front cushion unit. Since the bridge is provided, there is a space for placing parts between the front tubes above the connecting bridge, and as a result, the front space of the vehicle body frame can be effectively used.

Further, since the connecting bridge does not need to support the front suspension unit, the rigidity can be reduced, and as a result, the connecting bridge can be lightened, so that the weight of the vehicle body frame can be reduced.

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

FIG. 2 is a side view showing a saddle-ride type four-wheel vehicle to which an embodiment of the body frame structure of the saddle-ride type vehicle according to the present invention is applied.

Front wheels 12 are attached to the front of the body frame 11, and the front wheels 12 are steered by a bar handle 13. A rear wheel 14 is provided at the rear of the body frame 11, and the rear wheel 14
Is rotationally driven by an engine 15 mounted in the center of the vehicle body. Furthermore, a seat is provided on the upper rear part of the body frame 11.
16 is attached, and a footrest 17 is provided at the lower center of the body frame 11.

FIG. 3 is a perspective view showing the body frame 11. The body frame 11 is formed by forming metal tubes into a desired shape for each part and connecting the metal tubes. Welding means is mainly used for connection.

In FIG. 3, a main pipe 18 is provided in the upper center of the vehicle body, and a pair of left and right front tubes 19 extending obliquely forward and downward are connected to the front portion of the main pipe 18. On the other hand, a pair of left and right body tubes 20 extending downward are connected to the rear part of the main tube. This body tube 20
Is curved below the vehicle body to form a pair of left and right lower tubes that extend forward of the vehicle body and are connected to the front tube 19. A plurality of bridge tubes 22 are provided between the pair of left and right lower tubes 21 and between the pair of left and right body tubes 20.
Connected by.

The front wheel 12 is supported by the front tube 19 and the lower tube 21 in front of the body frame 11. A main bracket 18A is fixed to the front tube 19, and a head pipe (not shown) is provided on the main bracket 18A.
Steering shaft (not shown) on this head pipe
Is inserted. A bar handle 13 is attached to the upper end of the steering shaft, and the front wheel 12 is connected to the lower end thereof. Further, the engine 15 is mounted in a portion surrounded by the body tube 20 and the lower tube 21.

A pair of seat rails 23 extending obliquely upward and rearward are connected to the body tube 20, and the seat rails 23 are reinforced by a seat pillar 24. Further, the rear end portions of the pair of seat rails 23 are connected by the guide plate 25.

As shown in FIG. 1, a pair of left and right front tubes 19 and a lower tube 21 are connected by a pair of left and right down tubes 26 to reinforce the front tube 19. At the positions where the pair of left and right front tubes 19 and down tubes 26 intersect, the triangular flat plate reinforcements 27 shown in FIG. 4 are individually fixed by welding or the like. Mounting bracket for each lean force 27
28 is fixed by welding or the like, and the mounting bracket 28 supports the upper end of the front cushion unit 29.

On the other hand, the upper portions of the pair of left and right down tubes 26 are connected by the connecting bridge 30, and the down tube 26 and thus the front tube 19 are reinforced. As a result, the frame rigidity of the fixed portion of the lean reinforcement 27 is improved, and the front cushion unit 29 is reliably supported. Further, the connecting bridge 30 is a down tube as shown in FIG.
In 26, the mounting bracket 28 is arranged at a position lower than the fixed position of the vehicle in the vehicle. Then, the battery holder mounting bracket 31 is fixed to the connecting bridge 30 by welding or the like,
With this battery holder mounting bracket 31, the battery holder 32 shown by the chain double-dashed line in FIG. 4 is fixed by bolting or the like.

In this way, since the connecting bridge 30 that reinforces the front tube 19 is disposed at the vehicle lower position than the mounting bracket 28, a space for parts can be placed between the pair of down tubes 19 above the mounting bracket 28. The battery can be stored by installing the battery holder 32 in the space. Therefore, the front space of the vehicle body frame can be effectively used.

Further, since the connecting bridge 30 does not function as a mounting bracket for the front cushion unit like the conventional bracket 8 in FIG. 5, its rigidity can be reduced. Therefore, the weight of the connecting bridge 30 can be reduced, and the weight of the body frame 11 can be reduced. At the same time, the body frame
The cost of 11 can also be reduced.

Furthermore, since the mounting bracket 28 is fixed to the lean reinforcement 27 which is a flat plate fixed to the vehicle side of the vehicle body frame 11, the welding workability of the mounting bracket 28 is improved.

Further, the portion where the mounting bracket 28 supporting the front cushion unit 29 is fixed is the front tube 19
Is reinforced by the down tube 26 and the connecting bridge 30, and the rigidity of that portion is improved. As a result, the support of the front cushion unit 29 by the mounting bracket 28 becomes reliable.

〔The invention's effect〕

As described above, according to the vehicle body frame structure for a saddle-ride type vehicle according to the present invention, the pair of left and right front tubes are connected to the lower tube by the down tube to reinforce the front tube, while the connecting portion of the front tube is connected. A mounting bracket for supporting the front cushion unit was fixed in the vicinity, and the upper part of the down tube below the position where the mounting bracket was fixed was connected with a connecting bridge. A pair of down tubes and connecting bridges can be double reinforced to increase rigidity and improve physical and mechanical strength.

Further, since the pair of left and right front tubes are connected by the connecting bridge at a position lower than the fixed position of the mounting bracket supporting the front cushion unit by the connecting bridge, the front space of the vehicle body frame can be effectively used.

Further, since it is not necessary to support the connecting bridge connecting the pair of left and right front tubes on the front cushion unit, the weight can be reduced, and as a result, the weight of the vehicle body frame can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an essential part of an embodiment of a vehicle body frame structure for a saddle-ride type vehicle according to the present invention, and FIG. 2 is a saddle-ride type four-wheel vehicle to which the vehicle body frame structure shown in FIG. 1 is applied. FIG. 3 is a side view showing the whole body frame structure of FIG. 1, FIG. 4 is a side view of the main part of the body frame structure of FIG. 1, and FIG. 5 is a conventional saddle-ride type vehicle. It is a perspective view showing a body frame structure. 11 …… Body frame, 19 …… Front tube, 26 ……
Down tube, 27 …… Lean force, 28 ……
Mounting bracket 29, front cushion unit,
30 ... Connection bridge.

Claims (1)

(57) [Claims] 1. A vehicle body frame structure of a saddle-ride type vehicle having a pair of left and right front cushion units that support a pair of left and right front wheels so as to be able to be cushioned up and down. A main body frame 11 supports a steering shaft for mounting a bar handle. The vehicle body frame 11 is provided with a bracket 18A, and the vehicle body frame 11 extends forward through a pair of left and right front tubes 19 extending forward and downward from the main bracket 18A, and below the engine mounted in the center of the vehicle body, and is connected to the front tube 19. While forming the front part of the vehicle body frame from a pair of left and right lower tubes, the front tube 19 and the lower tube 21 are connected by a pair of left and right down tubes 26, in the vicinity of the connecting portion between the front tube 19 and the down tube 26. , Install a pair of left and right mounting brackets 28 that support the upper end of the front cushion unit 29. Each fixed, the down tube of the lower position than the fixed position of the mounting bracket 28
A body frame structure for a saddle-ride type vehicle characterized in that the upper portions of 26 are connected by a battery mounting connecting bridge 30.