JPS61229684A - Actuator for rear brake for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an automatic two-wheel drive system remotely controlled by a foot pedal.
The present invention relates to an operating device for a wheeled vehicle rear brake.

[Technical backbone of the invention and its problems]

The rear brake of a two-wheeled motor vehicle is generally remotely controlled via a pull rod connected to a foot pedal. The rear wheel is also suspended by a swing arm that is pivotally supported at the rear lower part of the frame so that it can swing vertically. If the tip of the pull rod is separated from the swing arm support shaft, the distance of the rear wheel to the tip of the pull rod changes due to its vertical movement, and the brake operating lever may be pulled without the need for a pull rod of a certain length. The tip of the pull rod must be positioned as close to the support shaft as possible so that the distance between the rod tip and the A7 wheel does not change during the swing. Therefore, part of the lever integrated with the foot pedal meets the above conditions! However, if the foot pedal is placed in a different position due to the layout, install the relay lever so that it satisfies the above conditions, and connect the foot pedal and the relay lever with another rod. do. However, if this rod is placed in the rear lower part of the frame, it tends to get in the way, and there is a problem that there is an increased chance of damage due to interference with other objects. On the other hand, in this type of brake device, the braking force is changed during the stroke of the foot pedal, thereby improving the feel of the brake and improving the braking performance. In this case, the lever ratio of the foot pedal hand saw is almost constant during the stroke, so measures such as incorporating a mechanism to change the lever ratio into the brake device have been taken, leading to a complicated structure.

[Purpose of the invention]

In view of the above-mentioned problems, this invention increases the degree of freedom in the layout of the actuation system, including the installation position of the foot pedal, and also makes it possible to change the input/output lever ratio within the actuation system. The purpose of this invention is to obtain an operating device for a rear brake of a two-wheeled motor vehicle.

[Summary of the invention]

With the above purpose in mind, the present invention is constructed as follows.

1. In a motorcycle in which a brake pedal for operating the rear brake is located at a remote position in front of the swing arm support shaft for rear wheel suspension. ] A relay lever device that connects two upper and lower bell ranks with a link is installed at the rear lower part of the frame directly below the swing arm support shaft, and the underbell crank of the relay lever device and the brake pedal are connected to the first pull rod along the lower part of the frame. In addition, the upper bell crank and the rear brake operating lever are connected by a second pull rod along the swing arm.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below.

In FIG. 1, reference numeral 1 indicates a frame of a two-wheeled motor vehicle that has an inverted trapezoid shape, and an engine 2 is mounted inside. A swing arm 3 is pivotally supported on a support shaft 4 at the rear lower part of the frame 1, and is pivotally supported on the rear end, and an A7 wheel 5 is pivotally supported by a cushion unit 6 so as to be vertically swingable. 7 indicates a rear brake operating lever.

The operating system that operates the rear brake includes a brake pedal 8 installed at the center of the lower part of the frame 1, a relay lever device 9 installed directly below the support shaft 4, a first pull rod 10 connecting the two, and a relay lever device 9. It is constituted by a second pull rod 11 that connects with the actuation lever 7.

The brake pedal 8, as shown in FIGS. 2 and 3,
A lever portion 8a is pivotally supported by a support shaft 13 protruding from the inner surface of a pedal bracket 12 fixed to the frame 1, and extends rearward from the brake pedal 8. Below the support shaft 13, a support shaft 1 similarly protrudes from the pedal bracket 12.
Bell crank 15 extending rearward and in the -V direction by 4
is pivoted. The rear end of the bell crank 15 and the rear end of the brake pedal lever part 8a are connected by a link 16, and the front end of the first pull rod 10 is connected to the upper end of the bell crank 15. This first pull rod 1° is arranged rearward along the lower part of the frame 1 under the side surface of the engine case.

The relay lever device 9 is constituted by two bell cranks 18 and 19, upper and lower, which are pivotally supported by a bearing boss 17 fixed to the frame 1. The upper bell crank 18 is the support shaft 2
The underbell crank 19 is provided with a lever that extends rearward and rearward around a support shaft 21, and the lower front end of the upper bell crank 18 and the lower front end of the underbell crank 19 are connected to each other. 41t 17-
D? A is connected by a link 22. The front end of the first pull rod 10 is connected to the rear lower end of the underbell crank 19. The rear upper end of the upper bell crank 18 is located close to the swing arm support shaft 4, and is connected to the front end of the second pull rod 11. This second pull rod 11 is arranged substantially along the swing arm 3.

With the above configuration, when the brake pedal 8 is lowered to the road, the bell crank 15 rotates in the direction of the arrow via the link 16, and the first pull rod 10 is pulled forward, thereby causing the underbell crank 19 to rotate in the direction of the arrow. move, link 22
The upper bell crank 18 rotates in the direction of the arrow to pull the second pull rod 11 forward, thereby operating the rear brake.

When the relay lever device 9 moves, as shown in FIG. 4, θa increases and θb decreases. Since this change is set to be more pronounced on the θa side, the lever ratio φ increases.

αa for the first and second pull rods 10.11.

Since αb changes in substantially the same way and the increase/decrease in the lever ratio is canceled out, this operating system changes around the lever ratio φ.

That is, as the stroke of the brake pedal 8 increases, the lever ratio to the brake operating lever 7 increases (see FIG. 5), and the ratio of output to input increases, improving the effectiveness of the brake.

The operating characteristics of this brake can be freely set by selecting the dimensions and angle of the relay lever device.

〔Effect of the invention〕

As described above, the motorcycle rear brake actuating device according to the present invention includes a relay lever device that is a combination of two bell cranks connected by a link, directly below the swing arm support shaft, and connects the brake pedal and the brake. The lever is connected to the lever by two pull rods, and both pull rods are provided with a height difference so that they can each be moved to the most preferable position. The front end of the rear pull rod is positioned close to the swing arm support shaft so that it will not be affected by the vertical movement of the V-wheel, and the acid pull rod can be placed under the engine cover for aesthetic and safety. The C lever ratio can be changed in relation to the pedal stroke, which has the effect of improving brake feel and performance.

[Brief explanation of the drawing]

FIG. 1 is a side view of a two-wheeled motor vehicle showing an embodiment of the present invention;
Figure 2 is an enlarged side view of the same essential parts, Figure 3 is an enlarged plan view of the same, Figure 4 is a scale diagram of the relay lever device for explaining the operation, and Figure 5 is a lever. It is a chart showing changes in the ratio. 1...Frame, 3...Swing arm, 4...
Support shaft, 5...A7 wheel, 7...17 brake operating lever, 8...brake pedal, 9...relay lever device, 10...first pull rod, 11:...・
2nd pull rod, 18... Upper bell crank, 1
9...underbell crank, 22...link. Applicant's agent Hisashi Hatano 4 Figure Petapal Stroke

Claims (1)

[Claims] In motorcycles in which the brake pedal for operating the rear brake is placed at a remote location in front of the swing arm support shaft for rear wheel suspension, a relay lever device that connects two bell cranks (upper and lower) with a link is placed directly below the swing arm support shaft. It is installed at the rear lower part of the frame, and connects the underbell crank of the relay lever device and the brake pedal with the first pull rod along the lower part of the frame, and connects the upper bell crank and the rear brake operating lever with the second pull rod along the swing arm. An operating device for a rear brake of a two-wheeled motor vehicle, which is connected by a pull rod.