JPH0427687A - Brake pedal mounting device for motorcycle - Google Patents

Abstract

PURPOSE:To reduce the number of constituting part as enough frame strength is provided and to manufacture a brake pedal mounting device for a motor bicycle at a low cost by forming the center frame of the central part of a frame in the shape of a box of a steel sheet, and pivotally mounting the rear end of a brake pedal to a shaft cylinder welded to the frame in a manner to extend therethrough. CONSTITUTION:In a frame, only center frames 1 on both sides are formed such that a device press-molded in a box type by using a steel sheet is welded. The rear ends of front pipes 2 of a steel pipe on both sides are welded to the upper front ends of the center frames 1 on both sides, and the front ends of rear pipes 3 on both sides are welded to the upper rear ends thereof. A shaft cylinder 4 is welded to the lower rear part of the center frame 1 on the one side in a manner to be horizontally extended through, and a pin 5 is protruded internally of the lower front part of the shaft cylinder 4 of the center frame 1 to which the shaft cylinder 4 is selded. A brake pedal 6 has a rear end to which a support shaft 7 is horizontally coupled, the support shaft 7 is inserted and pivotally mounted to the shaft cylinder 4, and the front end of a brake rod 9 is coupled to the upper end of a rod arm 8 fastened against the inner end of the support shaft 7. Further, a return spring 10 is stretched between the lower end of the rod arm 8 and the pin 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a brake pedal mounting device for an underbone type motorcycle in which the center portion of the frame is lowered.

(Prior Art) Motorcycles are provided with footrests that protrude from the left and right sides of the lower center of the frame, so that a rider can place his or her feet on the footrests.

A brake pedal is provided on the front side of one footrest, and the rear wheels are braked by pressing down on the brake pedal with the toe of the foot placed on the footrest and rotating the brake pedal. The brake pedal has a support shaft at the rear end rotatably attached to a shaft cylinder provided in the frame. In the case of a frame made of pipe, a horizontal hole is provided in the frame pipe and the shaft tube is inserted and welded thereto, or a steel plate bracket with the shaft tube welded to the frame pipe is attached by welding. For example, see JP-A-55-63977 and JP-A-57-707H.

(Problems to be Solved by the Invention) Providing a horizontal hole in the frame pipe and inserting and welding the shaft tube reduces the strength of the frame pipe and requires the necessity to straddle the shaft tube between the left and right frame pipes. , the structure becomes complex and heavy. In addition, when a bracket with a shaft cylinder welded to it is welded to a frame pipe, there is no problem with the strength of the frame pipe, but the number of parts of the bracket increases.

In view of the above, the present invention makes the left and right center frames made of steel plates, the front pipe and the rear vibe are welded to the center frames, and the shaft cylinder on which the support shaft of the brake pedal is attached to the center frame portion. weld through the
To obtain a brake pedal attachment device for a motorcycle that can be manufactured at low cost with a small number of component parts while obtaining sufficient frame strength.

(Means for Solving the Problems) In order to achieve the above object, the brake pedal mounting device for a motorcycle of the present invention is provided with left and right center frames formed in a box shape from a steel plate, and in front of the left and right center frames. The left and right front pipes are welded to the upper end, the left and right rear vibes are welded to the rear upper end, and the shaft tube is welded by penetrating the rear lower part of one center frame laterally, and a pin is attached to the inside of the front lower part. Weld the protrusion and insert the support shaft at the rear end of the brake bevel into the shaft cylinder, connect the rod arm to the inner end of the support shaft so that it can rotate, and connect the rear wheel brake rod to the upper end of the rod arm. The reason is that a return spring is attached to the lower end of the rod arm and the pin.

(Operation) When you press down on the tip of the brake pedal and rotate it around the support shaft, the rod arm rotates at the same time, pulling the brake rod and pulling the rear wheel brake lever, causing the rear wheel to brake. can. When you release your foot from the brake pedal, the brake pedal will return to its original position. Since the center frame at the center of the frame is made into a box-shaped steel plate, the shaft tube can be directly passed through the center frame and welded to it, making it possible to reduce the number of component parts while maintaining strength. Also, since the rod arm and return spring are attached to the inside of the center frame on one side, they are not visible, resulting in a good appearance.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

The frame is made by press-forming a copper plate into a box shape and welding only the left and right center frames 1, and the rear ends of the left and right front pipes 2 of steel pipes are welded to the front upper ends of the left and right center frames 1. . Also, there are 3 left and right rear vibes on the upper rear end.
Weld the front end of the In this way, while mainly using steel pipes,
The left and right center frames 1 are made of steel plates. The shaft tube 4 is laterally passed through the rear lower part of the center frame 1 on one side and welded and □. Then, a pin 5 is provided protruding from the inside of the front lower part of the shaft tube 4 of the center frame 1 to which the shaft tube 4 is welded. The brake bevel 6 has a support shaft 7 connected to its rear end laterally, and the support shaft 7 is inserted into the shaft cylinder 4 and pivoted thereon. Support shaft 7
The inner end of the rod arm 8 is engraved with serrations, into which the rod arm 8 is inserted and fastened to the rotating body. The front end of a brake rod 9 is inserted and connected to the upper end of the rod arm 8. Further, both ends of the return spring 10 are hooked and stretched between the lower end of the rod arm 8 and the pin 5. The return spring 10 can be attached by stretching and latching, so assembly is easy. When the brake pedal 6 is depressed and rotated about the support shaft 7, the rod arm 8 simultaneously rotates and the brake rod 9 can be pulled to brake the rear wheels. If you take your foot off the brake pedal 6,
The brake pedal 6 is returned to its original position by a return spring 10. Note that the rear part of the engine case 11 is suspended on the left and right center frames 1, and footrests 1 are mounted on both sides via brackets.
Attach with 2 sticking out. Further, the front end of the rear fork 13 is pivotally attached to the left and right center frames 1.

(Effects of the Invention) As explained above, since the present invention is constructed as described above, the center frame is made of steel plate and can have any cross-sectional shape, and sufficient strength can be maintained even when directly welded through the shaft cylinder. .

In addition, the number of components for mounting the shaft cylinder can be reduced and the cost can be reduced. In addition, the rod arm and return spring are located inside the center frame on one side and are not visible, improving the appearance.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a partially cutaway plan view, FIG. 3 is a partially cutaway rear view, and FIG. 4 is an overall side view of the frame. Figure, is. 1... Center frame, 2... Front vibe, 3...
Rear pipe, 4... Axis cylinder, 5... Pin, 6... Brake rod, 7... Support shaft, 8... Rod arm, 9
...Brake rod, 10...Return spring.

Claims (1)

[Claims] The left and right center frames are box-shaped steel plates,
The left and right front pipes are welded to the front upper ends of the left and right center frames, and the left and right rear pipes are welded to the rear upper ends of the left and right center frames. A pin is protruding and welded to the inside of the front lower part, the support shaft at the rear end of the brake pedal is inserted into the shaft cylinder, and the rod arm is rotatably connected to the inner end of the support shaft, and the rear wheel is attached to the upper end of the rod arm. A brake pedal mounting device for a motorcycle, characterized in that a brake rod is connected to the lower end of the rod arm and a pin is tensioned with a return spring.