JPS6231352Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear brake device for a motorcycle, and more particularly to an improvement in the anti-rotation structure of a brake transmission member that connects a rear brake operating member and a brake operating arm.

As a rear brake device for a motorcycle, a pivot 10 is installed at the bottom of a vehicle body frame 100 as shown in FIG.
A brake pedal 101, which is a second operating member,
A rear brake device is known in which a brake arm 108, which is a brake actuation member of the rear wheel 112, is connected to a brake cable 105, which is a transmission member, and the brake cable 105 is arranged directly below the rear fork 111. .

Specifically, a bracket 104 is pivotally supported 103 at the rear of a substantially bell-crank-shaped brake pedal 101.
has a circular hole 144 in the brake cable 1.
The cylindrical end 106 fixed to one end of the bracket 105 is passed through the circular hole 144, and the large-diameter cylindrical boss portion 162 of the end 106 faces into the U-shape of the bracket 104 and is locked therein. On the other hand, a pin 109 is installed between the left and right bifurcated portions 108a of the brake arm 108, a circular hole 109a is formed in the pin 109, a rod 107 fixed to the other end of the brake cable 105 is passed through the circular hole 109a, and the tip of the rod 107 is inserted. The wing nut 110 is fastened to the adjustment screw 171 formed in the section.

In order to prevent the cable 105 from rotating when adjusting the set length of the brake cable 105 using the screw 171 and nut 110, a coil spring 173 is conventionally installed between the boss 172 provided at the base of the rod 107 and the pin 109.
It was reduced in size.

However, since the rotation of the cable 105 is dependent on the friction caused by the reaction force of the spring 173, the brake arm 108
If the lower end position of the brake arm 108 is adjusted rearward, the spring load is low, and if the spring load is increased at such a position, the load will be high and difficult to adjust when the lower end position of the brake arm 108 is adjusted forward. There are drawbacks.

Furthermore, since the structure requires a coil spring 173, there is room for improvement in terms of reducing the number of parts and improving ease of assembly.

The above problem also occurs when the rear brake transmission member is configured as one long brake rod.

This idea was created in view of the above circumstances.
The goal is to create a system that does not require coil springs or make any changes to the adjustment mechanism, and only requires a slight modification to the connection between the bracket provided on the rear brake operating member and the rear brake transmission member. To provide a rear brake device for a motorcycle that can reliably prevent rotation of a transmission member, is easy to adjust, and can simultaneously reduce the number of parts and improve assemblability.

In order to achieve such an object, the present invention includes a bracket pivotally supported on the rear brake operating member;
The gist is that the end portion of the rear brake transmission member is coupled to the end portion of the rear brake transmission member by square fitting to prevent rotation.

Preferred embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 6.

1 to 3 show the first embodiment,
Figure 1 is a side view showing the connected state of the pedal, cable and arm, Figure 2 is a plan view of the main part of the connection between the pedal and cable, and Figure 3 is an end view as seen from the direction of the arrow. be.

First, as in the conventional case, a substantially bell crank-shaped brake pedal 1 is pivotally supported at its rear lower end by a support shaft 2 that projects laterally from the lower part of the vehicle body frame (not shown). A bracket 4 is pivotably supported at its tip via a pin 3. The bracket 4 has a U-shape in plan, and has a square hole 42 formed in the center of its mounting surface 41 facing rearward, and a cutout groove 43 formed upward from the square hole 42.

On the other hand, a square column part 6 fits the base of the end 6 fixed to one end of the brake cable 5 into the square hole 42.
1, and a large-diameter cylindrical boss portion 62 is formed at the tip.

Then, the cable 5 is inserted into the square hole 42 through the notch groove 43 formed in the mounting surface 41 of the bracket 4, and the end 6 is exposed inside the U-shape of the bracket 4. By pulling the cable 5, the square column part of the end 6 is inserted. 61 is fitted into the square hole 42.

Then, the rod 7 fixed to the other end of the brake cable 5 is passed through the circular hole 9a of the pin 9 installed in the left and right bifurcated portions 8a constituting the lower part of the brake arm 8, and the adjustment screw 71 at the tip of the rod 7 is inserted into the hole 9a. Natsu 10
conclude.

The brake cable 5 is also disposed directly below the rear fork (not shown), as in the prior art described above.

Further, in the second embodiment, as shown in FIGS. 4 and 5, a circular hole 4 is provided in the center of the mounting surface 41 of the bracket 4.
4 and a cutout groove 43 extending upward from this circular hole 44.
On the other hand, the base of the cable end 6 is formed into a cylindrical part 63 that fits into the circular hole 44, and the tip has a U-shaped planar part between the left and right pieces 45 and 46 of the bracket 4. A rectangular boss portion 64 that fits is formed.

In this way, the cable 5 is inserted into the circular hole 44 through the notched groove 43 formed on the mounting surface 41 of the bracket 4, and the square boss portion 64 of the cable end 6 is fitted between the left and right pieces 45, 46 of the bracket 4. and then pull cable 5 to connect end 6.
The cylindrical portion 63 is passed through the circular hole 44.

As described above, in the present invention, the cable end 6 is attached to the bracket 4 which is pivotally supported 3 on the brake pedal 1.
Square fitting 43 and 61, or 45, 46 and 64
Since the cable 5 is coupled to prevent rotation, it is possible to prevent rotation at all times more reliably than by conventional friction using a spring reaction force, and the set length of the cable 5 can be easily adjusted. In addition, since there is no need for coil springs as in the past, the number of parts can be reduced, and
Since a simple square fitting is sufficient, assembly can be simplified.

Therefore, as shown in FIG. 6, a long brake rod 15 is disposed directly below the rear fork 11 to connect the brake arm 8 to a bracket 4 that is pivotally supported on the brake pedal 1. ,
Even if such a brake rod 15 is provided with a bent portion 15a as shown in the drawing due to the layout, the bracket 4 and the brake rod 15 are simply connected by the square fitting of the present invention, and the brake rod 15 rotates due to vibration and its shape is fixed. The bent portion 15a may interfere with the upper rear fork 11, or the rear fork 11 may
It is possible to reliably prevent it from protruding to the side.

Furthermore, as in each of the above embodiments, the square fitting between the bracket 4 and the cable end 6 is achieved by simply inserting the cable 5 into the cutout groove 43 formed on the mounting surface 41 of the bracket 4, so that installation and removal of the cable 5 is easy. It can also be done as easily as one touch.

As is clear from the above description, according to the present invention, since the bracket pivotally supported on the rear brake operating member and the end of the rear brake transmission member are connected to prevent rotation by square fitting, the coil that was previously required can be removed. It is possible to eliminate the spring and to make any changes to the adjustment mechanism constructed at the joint between the transmission member and the rear brake actuating member, making it possible to reliably prevent the transmission member from rotating. can be easily performed, and furthermore, it is possible to simultaneously achieve a reduction in the number of parts and an improvement in ease of assembly.

[Brief explanation of the drawing]

Fig. 1 is a side view of the rear brake device according to the first embodiment, Fig. 2 is a plan view of the main part thereof, Fig. 3 is an end view in the direction of the arrow in Fig. 2, and Fig. 4 is the rear brake device according to the second embodiment. 5 is an end view in the direction of the arrow in FIG. 4, FIG. 6 is a side view showing a modified example of the rear brake transmission member together with a rear fork, and FIG. 7 is a conventional example. FIG. 8 is a perspective view showing the arrangement of the rear brake device, and FIG. 8 is a side view of the rear brake device. In the drawing, 1 is an operating member, 4 is a bracket, and 41
is its mounting surface, 42 is a square hole, 43 is a notched groove, 4
5 and 46 are side pieces, 5 and 15 are transmission members, 6 is the end thereof, 61 and 64 are prismatic parts, 71 is an adjustment screw,
8 is an operating member, 9 is a pin, 10 is a nut, and 11 is a rear fork.

Claims (1)

[Scope of utility model registration request] A rear brake device for a motorcycle, comprising: a brake transmission member that connects a rear brake operation member and a rear brake operation member; the transmission member is disposed directly below a rear fork, and the transmission member is connected to the operation member with an adjustment screw; A rear brake device for a motorcycle, characterized in that an end portion of the transmission member is squarely fitted to a bracket provided to be pivotally supported on the operation member to prevent rotation.