JPS6221511Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake device for a motorcycle.

Generally, when the brakes are applied on a motorcycle, the rear wheel tends to lift up, which is an undesirable tendency.

Therefore, the applicant has determined that the mounting position of the rear brake torque bar on the frame side is such that it intersects the rear swing arm, that is, in the case of a disc brake, the rear brake caliper is located below the rear swing arm. Sometimes, the caliper is coupled to the rear end of a rear brake torque bar whose front end is pivoted to the upper part of the rear swing arm, and when the rear brake caliper is located above the rear swing arm, the caliper is coupled with the front end to the rear brake torque bar. A rear brake device has already been provided that is connected to the rear end of a rear brake torque bar pivoted to the lower part of the swing arm to prevent the rear wheel from lifting when the rear brake is activated (Utility Application No. 113902/1983). .

However, when looking at actual braking, the front brake is used quite often, and the rear wheel also lifts up at this time, so it is necessary to prevent this lifting.

The present invention has been made based on such requirements. The object is to provide a brake device for a motorcycle that prevents the rear wheel from lifting up as much as possible when the front brake is operated.

Hereinafter, the structure and operation of the present invention will be explained in detail with reference to the drawings showing one embodiment thereof.

FIG. 1 shows the entire brake system of the device of the present invention, where 1 is a front master cylinder and 2 is a rear master cylinder. A front master cylinder 1 is attached to a right-hand handle shaft 3, and generates hydraulic pressure to be supplied to a front disc brake 5 by operating a front brake lever 4. The rear master cylinder 2 is attached to the vehicle body frame, and generates hydraulic pressure to be supplied to the rear disc brake 7 by operating a rear brake pedal 6. Hydraulic oil is supplied to each of these cylinders 1 and 2 from attached brake fluid tanks 8 and 9, and each pipeline 1
Through 0,11, front disc caliper 1
2 (the cylinder installed on the caliper 12') and the rear disk caliper 13 (the cylinder installed on the caliper 13) are communicated with each other.

A rear sub-master cylinder 14 is also attached to the front master cylinder 1 as shown in FIG. This cylinder 14 is connected to the rear master cylinder 2 through a pipeline 15. This linkage, for example, connects the sub-master cylinder 16 to the rear master cylinder 2.
This is done via the cylinder rod 17 of the cylinder 16 and the bell crank 18. Therefore, when the front brake lever 4 is gripped and operated, the front master cylinder 1 presses the friction pad held by the caliper 12 of the front disc brake 5 against the front brake disc 19 to brake it, and at the same time, the rear sub-master cylinder 14 is transmitted to the sub-master cylinder 16 and rear master cylinder 2, and the friction pads held by the caliper 13 of the rear disc brake 7 are pressed against the rear brake disc 20 to brake it.

The rear submaster cylinder 14, which operates as described above, is provided with a hydraulic pressure adjustment mechanism 21. In the case of this embodiment, a hydraulic pressure adjustment push rod 22 protrudes in the direction of the front brake lever 4 of the cylinder 14, and an adjustment dial (eccentric cam) 23 attached eccentrically to the base end of the front brake lever 4 is attached to the push rod 22. It is composed of inverted tangents. Its eccentric width is δ, and by adjusting the dial 23 with a finger, the lever length l is changed and the oil pressure of the rear sub-master cylinder 14 is adjusted. That is, the front brake lever 4
The braking force of the rear desk brake 7 during operation can be adjusted. Note that the adjustment dial 23 may be fixed with a separate lock screw or the like at all times so that it cannot be rotated freely.

On the other hand, the rear brake torque bar 24 connected to the caliper 13 is approximately S as shown in FIG.
It is attached to the frame 25 in a shape that crosses the rear swing arm 26. That is, since the caliper 13 is located below the rear swing arm 26, the attachment position of the rear brake torque bar 24 to the frame 25 is located above the rear swing arm 26. In addition, when the caliper 13 is provided above the rear swing arm 26, the attachment position of the rear brake torque bar to the frame 25 is set below the rear swing arm 26.

Next, its effect will be explained.

When the front brake lever 4 is gripped and operated, the front disc brake 5 is applied by the front master cylinder 1 as described above, and at the same time,
The rear sub-master cylinder 14 also operates to increase the oil pressure of the rear master cylinder 2, and the rear disc brake 7 is braked by an appropriate amount. Then, the swing arm 26 rotates upward around the frame side due to the tensile action of the rear brake torque bar 24. In other words, the rear wheel sinks. The degree of depression of the wheel can be easily adjusted by rotating the adjustment tire 23 on the front brake lever 4 mentioned above with a finger or the like. Further, by depressing the brake pedal 6, only the braking force of the rear disc brake 7 can be increased.

As explained above, according to the brake device of the present invention, the rear submaster cylinder is attached to the front master cylinder, the rear submaster cylinder is linked to the rear master cylinder, and the rear brake torque bar crosses the rear swing arm. Therefore, even when the front brake is activated by gripping the front brake lever, the rear disc brake can apply an appropriate amount of braking to prevent the rear wheel from lifting. Therefore, it is particularly effective in racing machines, but safety during braking can also be ensured in commercially available cars. However, in the case of commercially available vehicles, it is preferable to eliminate the hydraulic pressure adjustment mechanism and set a constant optimum value.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the entire brake system related to the brake device of the present invention. FIG. 2 is a front view of the rear sub-master cylinder seen from above in FIG. 1. FIG. 3 is a schematic side view showing how the rear brake torque bar is attached. 1...Front master cylinder, 2...Rear master cylinder, 4...Front brake lever, 5...Front brake, 6...Brake pedal, 7...Rear brake, 14...Rear submaster cylinder, 21... Hydraulic adjustment mechanism, 2
4...Rear brake torque bar, 26...Rear swing arm.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A rear sub-master cylinder is attached to a front master cylinder that generates hydraulic pressure to be supplied to the front brake by operating the front brake lever, and The rear sub-master cylinder is configured to generate hydraulic pressure, and the rear sub-master cylinder is linked to a rear master cylinder that generates hydraulic pressure to be supplied to the rear brake by operating the rear brake pedal, and further,
When the rear brake caliper is located below the rear swing arm, the front end of the caliper is connected to the rear end of the rear brake torque bar which is pivoted to the upper part of the rear swing arm, and the rear brake caliper is placed on the rear swing arm. A brake device for a motorcycle, characterized in that when the caliper is located on the upper side, the caliper is connected to the rear end of a rear brake torque bar whose front end is pivoted to the lower part of the rear swing arm. (2) Utility Model Registration Claim 1, which is provided with a hydraulic adjustment mechanism that adjusts the hydraulic pressure generated by the rear sub-master cylinder in accordance with the amount of operation of the front brake lever.