JPS6232958Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a stopper for regulating the return position of a rear brake lever of a two-wheeled motor vehicle.

FIG. 3 shows a rear brake mechanism in a conventional motorcycle. In the figure, 1 is a rear brake lever, and this rear brake lever 1 is attached to a shaft body 4 supported by a bracket 3 welded to a vehicle body frame 2.
It is rotatably supported by the vehicle body frame 2. 5 is a rear wheel, 6 is a brake drum, 7 is a brake arm thereof, 8 is a brake operating member made of a rod or wire connected to the brake arm 7, and 9 is a brake operating member 8 and the rear brake lever 1. a connecting member to connect;
10 is a return spring wound around the shaft body 4 of the rear brake lever 1, 11 is a foot pedal, and 12 is a footrest fixed to the vehicle body frame 2.
20 is a rear brake lever stopper consisting of a bolt 21 and a nut 22;
is attached to a pedestal 23 welded to the vehicle body frame 2, and has the role of regulating the position to which the rear brake lever 1 is returned by the return spring 10. Loosen the nut 22 and rotate the bolt 21. By doing so, the position of the tip of the bolt 21 can be adjusted.

Next, the operation of the rear brake mechanism configured as described above will be explained.

First, when the foot pedal 11 is depressed and the rear brake lever 1 is rotated around the shaft body 4 in the direction of the arrow A, the brake operating member 8, which engages with the rear brake lever 1 via the connecting member 9, is moved in the direction indicated by the arrow B.
As a result, the brake arm 7 rotates, and a brake shoe (not shown) presses against the brake drum 6 to perform braking.

Also, when the foot pedal 11 is released, the return spring 1
0, the rear brake lever 1 and the brake operating member 8 move around the shaft body 4 in the opposite direction to the above, and the braking force on the brake drum 6 is released.

In the rear brake mechanism configured in this way,
The nut 22 of the rear brake lever stopper 20 may loosen due to vibrations during driving, so the bolt 21 rotates and descends, pushing down the rear brake lever 1 and putting the rear brake mechanism into an activated or semi-activated state. If you drive in this condition, you may experience a problem with the brakes dragging.

Further, when setting the position of the rear brake lever 1, it is necessary to rotate not only the nut 22 but also the bolt 21 for adjustment. Therefore, ease of assembly and maintenance is poor.

This idea was made to eliminate the above-mentioned drawbacks, and instead of the conventional bolt-and-nut type stopper, an eccentric cam is used as a member to restrict the position where the rear brake lever returns elastically. This improves ease of assembly and maintenance, and when the tightening force of the eccentric cam loosens,
The rear brake of a two-wheeled motor vehicle can prevent the brake from dragging when the eccentric cam is loosened by arranging the eccentric cam so that it rotates when pushed up by the rear brake lever. The purpose is to provide a stopper for a lever.

Embodiments of this invention will be described below with reference to the drawings.

FIG. 1 is a front view of essential parts showing an embodiment of a stopper for a rear brake lever of a motorcycle according to this invention. In the figure, 13 is an eccentric cam, and 14 is a mounting bracket thereof. Welded to frame 2. Disc-shaped eccentric cam 13
is a threaded member 16 consisting of a bolt on the eccentric shaft 15.
is fastened to the mounting bracket 14 to constitute a rear brake lever stopper 17. 18 is an eccentric cam 1 welded on the rear brake lever 1.
This is an abutting member that abuts against the circumferential surface 19 of No. 3.

The eccentric cam 13 regulates the position to which the rear brake lever 1 returns by the spring force of the return spring 10 when the foot pedal 11 is released. This eccentric cam 13 is moved by the contact force of the rear brake lever 1 to the eccentric shaft 15.
It is arranged so that rotational force is generated around it. In other words, as clearly shown in FIG. 2, the contact force F when the contact member 18 contacts the eccentric cam 13 is
The eccentric cam 13 is arranged so as not to pass over the axis 15a of the eccentric shaft 15. The rest of the structure is the same as that of the conventional example shown in FIG. 2, and the same or corresponding parts are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

In the above configuration, the screw member 16 may loosen. Here, in this invention, since the contact force F of the rear brake lever 1 does not pass over the axis 15a, a rotational force is generated in the eccentric cam 13 around the eccentric shaft 15 due to this contact force F. Therefore, when the rear brake lever 1 returns, the eccentric cam 13 shown by the two-dot chain line rotates downward with the contact member 18, and rotates around the axis 15a and pushes up to the position shown by the one-dot chain line. It will be done. Therefore, even if the screw member 16 loosens while the vehicle is running, there is no risk of the brake dragging.

Furthermore, when installing the rear brake lever 1 in the position shown in FIG. 1, it is sufficient to loosen the screw member 16, determine the position of the rear brake lever 1, and then tighten the screw member 16. Therefore, it is not necessary to rotate both the bolt and the nut as in the conventional case, which improves ease of assembly and maintenance.

In the embodiment, an example of an internal expansion type brake drum and shoe has been described, but the present invention is not limited to this, and can also be applied to a hydraulic type brake disc and friction pad type. In this case, when the brake disc and the friction pad come into pressure contact, there is a risk that the friction will cause overheating, and the heat will heat the oil and deteriorate the oil, but this does not occur in the present application.

As explained above, according to this invention, it is possible to prevent the brake from dragging, and it is also possible to easily adjust the position at which the rear brake lever returns elastically.

[Brief explanation of the drawing]

Fig. 1 is a front view of essential parts showing an embodiment of the rear brake lever stopper according to this invention, Fig. 2 is a front view showing the operation of the eccentric cam of this invention, and Fig. 3 is a front view of a conventional rear brake lever stopper. FIG. DESCRIPTION OF SYMBOLS 1... Rear brake lever, 2... Vehicle body frame, 4... Shaft body, 10... Return spring, 13... Eccentric cam, 15... Eccentric shaft, 16... Screw member, 1
7...Stopper for rear brake lever, F...Contact force.

Claims (1)

[Scope of utility model registration request] An eccentric cam that is supported by a rotating self-member with respect to the vehicle body frame via a shaft body, and that comes into contact with a rear brake lever that returns elastically to regulate the position of the rear brake lever that returns elastically. and a screw member that fastens the eccentric cam to the vehicle body frame on the eccentric shaft, and the eccentric shaft generates rotational force in the eccentric cam around the eccentric shaft due to the contact force of the rear brake lever. A stopper for the rear brake lever of a motorcycle, which is set in the position where it is used.