JPS6346312Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a split type frame for a motorcycle in which the body frame is divided into a front part and a rear part.

(Prior Art) A configuration in which a vehicle body frame is divided into a front frame on which an engine is mounted and a rear frame on which a seat is mounted is already known. However, in the conventional structure, a bracket dedicated to the rear frame is provided on the front frame, and a bracket dedicated to the swing arm supporting the rear wheel and a step plate for attaching a step for the passenger are also separately provided. This not only complicates the structure, increases cost, and reduces strength, but also hinders efforts to reduce the weight of the vehicle body.

Note that known documents include JP-A-57-15086, JP-A-58-16966, and JP-A-58-16967.

(Purpose of the invention) By using the step plate as another bracket, the structure is simplified, the frame strength is improved, and the weight of the vehicle body is reduced.

(Structure of the idea) (1) The frame is divided into a front frame on which the engine is mounted and a rear frame on which the seat is placed.

(2) 2 parallel to the rear end of the front frame in the vertical direction
Provide a rear tube for books.

(3) Fix the step plates for mounting the steps to both rear tubes.

(4) The step plate also serves as part of the frame.

(5) The step plate also serves as a support bracket for the front end of the swing arm and a support bracket for the front end of the backstay extending from the rear frame in a forward downward position.

(Example) Fig. 1 is a schematic diagram of the left side of a motorcycle;
The vehicle body frame 1 is made up of a combined body of a front frame 2 and a rear frame 3. The front frame 2 has a head tube 4 at its front end that rotatably supports a steering member (not shown), and has two left and right substantially parallel main frames 5 extending rearward from the tube 4. The down tube 6 is a symmetrical tube with two left and right tubes arranged in a backward downward position. A frame 7 is installed. The rear part of the main frame 5 is curved downward to integrally form a rear tube 8, and the lower end of the tube 8 and the lower end of the down tube 6 are curved and integrally formed so as to face each other. Main frame 5, down tube 6, rear tube 8
When viewed from above, two rods are arranged at approximately symmetrical intervals across the centerline of the vehicle body, and are connected in a generally annular shape when viewed from the side, and are arranged at appropriate intervals in the left-right direction. Each pair of members is integrally connected by a cross pipe (not shown). Here, the rear tube 8 that is substantially parallel in the vertical direction is
As will be described later, the step plate 9 is divided into parts at intervals, and the tube upper part 8a and the tube lower part 8b are connected by the plate 9.

On the other hand, the front end of a swing arm 12, which rotatably supports a rear wheel 10 via a rear axle 11, is rotatably supported on a left-right pivot shaft 13, and the shaft 13 is supported by the step plate 9 fixed to the rear tube 8. As shown in Fig. 2, the step plate 9 is a vertical flat member, and bosses 14 protrude from both the left and right plates 9 at positions facing each other in the left-right direction, and a left-right shaft 13 (bolt) is installed between both bosses 14.
A boss portion 15 at the front end of the swing arm 12 is rotatably fitted to the upper end of the swing arm 12 via a sleeve 16. A boss portion 17 formed at the upper end of the plate 9 is connected to a flat plate portion 18 formed at the lower end of the upper tube portion 8a.
The plate 9 is fixed integrally to the boss portion 2 at the lower end of the plate 9 by a bolt 19.
0 is fixed integrally by a bolt 22 to a flat plate portion 21 formed at the upper end of the lower tube portion 8b.

As shown in FIG. 1, the back frame pipes 25 of the rear frame 3, which are arranged behind the front frame 2 and above the rear wheels 10, extend approximately horizontally in the front-rear direction and are provided in two symmetrical shapes ( Only the left side is shown), the rear end of the pipe 25 is curved into a U shape and formed integrally, and both pipes 25 are firmly integrated by an appropriate number of cross pipes installed in the left-right direction between the two pipes 25. It has become The front end of the pipe 25 is integrally connected to a bracket 26 provided at the rear end of the melon frame 5 via a left-right support shaft 27. Furthermore, the rear upper ends of back stays 28 (only the left side is shown), which are disposed on both sides of the vehicle in a forward downward position, are welded to the intermediate lower surfaces of the left and right back frame pipes 25, and the front ends of the back stays 28 are attached to steps. It is fixed to a protrusion 29 (bracket) formed at the upper end of the plate 9. As shown in FIG. 3, a flat plate-shaped portion 30 is formed at the front end of the backstay 28, and a boss portion 31 that projects toward the backstay 28 is formed on the protruding piece 29. The flat plate portion 30 and the boss portion 31 are integrally connected by two left and right bolts 32 arranged in the longitudinal direction of the backstay 28.

On the other hand, as shown in FIG.
A step 33 for the operator (only the left side is shown) is fixed to the lower half of the left and right outer sides of the
A step 34 for a passenger (only the left side is shown) is fixed to the rear end extension of the plate 9. Also 35
Reference numeral 36 indicates an engine mounted in a space surrounded by the front frame 2, and 36 a seat disposed on the back frame pipe 25.

Note that the step plate 9 is a member made by casting or forging. Further, the back frame pipe 25 and the back stay 28 may be made of cast or forged products, and the assembly structure between the pipe 25 and the back stay 28 may be formed using a bracket and bolts.

(Effects of the invention) Since the step plate serves as both the swing arm bracket and the back stay bracket, and also serves as part of the front frame and part of the back stay, the frame structure is simplified and assembly is easy. Manufacturing costs can be reduced. Furthermore, the frame strength can be improved, and the weight of the vehicle body can also be reduced.

(Another Embodiment) In a motorcycle frame of the type in which one shock absorber is disposed between the front frame 2 and the rear wheel 10, a bracket or swing arm 12 for supporting one end of the shock absorber is provided. The step plate 9 can also serve as a bracket for supporting one end of the link mechanism that connects the shock absorber.

[Brief explanation of the drawing]

FIG. 1 is a schematic left side view of a motorcycle employing the present invention, and FIGS. 2 and 3 are a cross-sectional view and a cross-sectional view, respectively, of FIG. 1. 1...Frame, 2...Front frame, 3...
Rear frame, 8... Rear tube, 9... Step plate, 12... Swing arm, 28...
...Backstay, 33, 34...Step, 35
...engine, 36...seat.

Claims (1)

[Scope of utility model registration request] The frame is divided into a front frame on which the engine is mounted and a rear frame on which the seat is placed, and two rear tubes are provided at the rear end of the front frame that are approximately parallel in the vertical direction. In a split type frame for a motorcycle, each of which has a fixed step plate for attaching the steps, the step plate also serves as a part of the frame, and also serves as a support bracket for the front end of the swing arm and the front end of the backstay extending from the rear frame in a forward downward position. A split type frame for a motorcycle, which is characterized in that it also serves as a support bracket for a motorcycle.