JPH0880888A - Brake device for motorcycles - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a brake device for a motorcycle in which a screw thread formed at an end portion of a brake rod is not worn. A brake transmitting member 47 connecting a brake operating member and a brake operating member 44 is connected to the brake operating member 44 via a pin 50, and the brake transmitting member 47 is formed on the pin 50. Hole 5
In the motorcycle braking device inserted in No. 1, a lightening hole 55 is formed in the pin 50 in addition to the transmission member hole 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for a motorcycle.

[0002]

2. Description of the Related Art Motorcycles are equipped with a brake device for decelerating or stopping the motorcycle. The brake device is roughly classified into a disc type and a drum type. Among them, the drum type brake device applies a brake lining to an inner surface of a peripheral wall of a metal brake drum that rotates together with wheels for braking. Less than,
7 (a) and 7 (b), the structure of a mechanical drum brake device used for, for example, the rear wheels of a motorcycle will be described.

As shown in FIG. 7 (a), a drum brake device 1 includes a cylindrical brake drum 2 that rotates together with wheels, and a pair of left and right arcuate brake shoes 4 supported at one end by an anchor pin 3. , A brake cam 5 arranged between the free ends of the brake shoes 4, a cam lever 6 having one end connected to the brake cam 5, a brake rod 7 connected to the cam lever 6, and each brake shoe 4 It is composed of a return spring 8 mounted in between. A lining material 9 is attached to the outer peripheral surface of each brake shoe 4. Each member other than the brake drum 2 is attached to a brake plate (not shown).

As shown in FIG. 7B, for example, when a brake pedal (not shown) is stepped on, a force is transmitted to the cam lever 6 through the brake rod 7, and the brake cam 5 is rotated. Then, as the brake cam 5 is rotated, as shown by an arrow X, the brake shoe 4
Is pressed against the inner peripheral surface of the peripheral wall of the brake drum 2, and a braking force is generated by the friction between the lining material 9 and the brake drum 2. When the brake is released, the brake shoe 4 is returned by the action of the return spring 8 and the braking action is lost.

FIG. 8 is an enlarged view of the cam lever 6, and FIG. 9 is a sectional view taken along the line IX-IX in FIG. A pin hole 10 is formed at the lower end of the cam lever 6, and the pin hole 1
A pin 11 is loosely fitted in 0. A rod hole 12 is formed in the pin 11, and an end portion of the brake rod 7 having a thread 13 formed therein is inserted into the rod hole 12. The brake rod 7 has an adjustment nut 15 via a spacer 14.
Are screwed together and positioned.

By the way, in the drum brake device 1, the lining material 9 is worn away as the drum brake device 1 is used, and as a result, the amount of play of the brake pedal becomes large. If the amount of play of the brake pedal becomes large, the brake shoe 4 will not be sufficiently pressed against the inner peripheral surface of the peripheral wall of the brake drum 2 no matter how much the brake pedal is depressed, and a sufficient braking force cannot be obtained. Therefore, by tightening the adjusting nut 15 described above, the distance of the brake rod 7 between the brake pedal and the cam lever 6 is shortened to reduce the amount of play.

[0007]

However, the pin constantly resonates due to vibration of the engine of the motorcycle. Resonance of the pin causes wear of the threads formed at the end of the brake rod, making it difficult for the adjusting nut to hold the brake rod in an appropriate position.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a brake device for a motorcycle in which a screw thread formed at an end portion of a brake rod is not worn.

[0009]

In order to solve the above-mentioned problems, a braking device for a motorcycle according to the present invention, as set forth in claim 1, is a brake for connecting a brake operating member and a brake operating member. In a motorcycle braking device in which a transmission member is coupled to the brake actuating member via a pin, and the brake transmission member is inserted into a transmission member hole formed in the pin, the pin includes a transmission member hole of the transmission member hole. In addition, a light hole is formed.

[0010]

In the present invention having the above structure, the brake transmission member connecting the brake operation member and the brake operation member is coupled to the brake operation member via the pin, and the brake transmission member is formed on the pin. In addition to the transmission member hole, a lighter hole is formed on the pin of the motorcycle brake device that is inserted into the transmission member hole, so that the weight of the pin is reduced and its resonance frequency deviates from engine vibration. , The pin no longer resonates. As a result, the threads formed at the end of the brake transmission member are not worn.

[0011]

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

FIG. 1 is a right side view showing an example of a motorcycle to which the present invention is applied.

In FIG. 1, the motorcycle 20 has a vehicle body frame 21, and a fuel tank 22 is provided above the vehicle body frame 21. In addition, the body frame 21
The engine 23 is mounted in the lower center. Engine 23
An exhaust pipe 24a that constitutes the engine exhaust system 24 is connected to the front side of the engine, and a silencer 24b is connected to the rear end of the exhaust pipe 24a.

A head pipe 25 is provided in front of the vehicle body frame 21, and a steering mechanism 26 is provided on the head pipe 25. The steering mechanism 26 includes a front fork 2 that rotatably supports a front wheel 27.
8 and the handlebar 29 are provided, and the handlebar 29
As a result, the front wheels 27 are steered so as to be rotatable left and right.

On the other hand, a swing arm 31 is pivotally attached to a pivot shaft 30 which is provided at the lower center of the body frame 21 so as to swing around the pivot shaft 30, and a rear wheel 32 is attached to a rear end of the swing arm 31 and a rear axle 33. It is rotatably supported by. The lower end of the rear shock absorber 34 is attached to the upper part of the swing arm 31 on the base end side, and the upper end of the rear shock absorber 34 is attached to the vehicle body frame 21.

A front brake device 35 and a rear brake device 36 are provided on the front wheels 27 and the rear wheels 32, respectively.

FIG. 2 is a side view of the wheel 37 of the rear wheel 32, and FIG. 3 is a sectional view taken along the line III--III of FIG.

The rear brake device 36 used for the rear wheel 32 of the motorcycle 20 is a general mechanical drum brake device. As shown in FIGS. 2 and 3, the rear brake device 36 is a rear wheel wheel. The cylindrical brake drum 39 fitted to the inner peripheral surface of the hub 38 of the hub 37 and rotating together with the rear wheel 37, the brake plate 40 closing the opening of the hub 38, and the anchor pin 41 fixed to the brake plate 40. A pair of left and right ends supported by anchor pins 41, which are arc-shaped brake shoes 42 arranged at positions facing the inner peripheral surface of the brake drum 39, and between the free ends of these brake shoes 42. The brake cam 43, a cam lever 44 that is a brake operating member having one end connected to the brake cam 43, and each brake shoe 42. Return spring 4, which is elastically mounted to
5 and. A lining material 46 is attached to the outer peripheral surface of each brake shoe 42. Further, one end of a brake rod 47, which is a brake transmission member, is connected to the other end of the cam lever 44.
As shown in FIG. 1, the other end of is connected to a brake pedal 48 that is a brake operating member.

FIG. 4 is an enlarged view of the cam lever 44.
FIG. 5 is a sectional view taken along the line VV of FIG. As shown in FIGS. 4 and 5, a pin hole 49 is formed at the lower end of the cam lever 44, and the pin 50 is loosely fitted in the pin hole 49. The pin 50 has a rod hole 5 which is a transmission member hole.
1 is formed, and the end portion of the brake rod 47 having the thread 52 formed therein is inserted into the rod hole 51. And
The brake rod 47 is positioned by screwing an adjusting nut 54 through a spacer 53 and is connected to a cam lever 44.

FIG. 6A is a front view of the pin 50.
FIG. 6B is a sectional view taken along the line BB of FIG. As shown in FIGS. 4, 5, 6 (a) and 6 (b), the pin 50 has a light hole 55 in addition to the rod hole 51.
For example, it is provided orthogonal to the rod hole 51.

Next, the operation of this embodiment will be described.

By depressing the brake pedal 48, a force is transmitted to the cam lever 44 through the brake rod 47, and the brake cam 43 is rotated. When the brake cam 43 is rotated, the brake shoe 42 is pressed against the inner peripheral surface of the brake drum 39, and the braking force is generated by the friction between the lining material 46 and the brake drum 39. When the brake pedal 48 is loosened, the brake shoe 42 returns to its original position by the action of the return spring 45, and the braking action is released.

By the way, in the drum brake device, the lining material 46 is worn away as the drum brake device is used, and as a result, the amount of play of the brake pedal 48 is increased. Therefore, by tightening the adjusting nut 54, the distance of the brake rod 47 between the brake pedal 48 and the cam lever 44 is shortened and the amount of play is reduced.

The pin 50 constantly resonates due to the vibration of the engine 23 of the motorcycle 20. However, since the pin 50 has the lightening hole 55 in addition to the rod hole 51, the weight thereof is reduced. By reducing the weight of the pin 50, its resonance frequency deviates from the vibration of the engine 23, and the pin 50 does not resonate. As a result, the thread 52 formed at the end of the brake rod 47
Does not wear as in the conventional case, and the adjustment nut 54 ensures that the brake rod 47 is held at an appropriate position.

In the above embodiment, the brake pedal 48 is used as the brake operating member and the brake rod 47 is used as the brake transmitting member. However, the brake lever is used as the brake operating member and the brake cable ( Wire) may be used. Further, although the above-described embodiment shows the example in which the present invention is applied to the rear brake device 36, the present invention can also be applied to the front brake device 35 including the drum brake device.

[0026]

As described above, according to the brake device for a motorcycle of the present invention, the brake transmission member connecting the brake operating member and the brake operating member is connected to the brake operating member via the pin. Together with the brake device of the motorcycle in which the brake transmission member is inserted into the transmission member hole formed in the pin, the pin has a lighter hole in addition to the transmission member hole, so that the weight of the pin is reduced. Since the weight is reduced and the resonance frequency deviates from the engine vibration, the pin does not resonate. As a result, the threads formed at the end of the brake operating member do not wear.

[Brief description of drawings]

FIG. 1 is a right side view of a motorcycle showing an embodiment of a braking device for a motorcycle according to the present invention.

FIG. 2 is a side view of a rear wheel.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged view of a cam lever.

5 is a cross-sectional view taken along the line VV of FIG.

6A is a front view of a pin, and FIG. 6B is a front view of FIG.
Sectional drawing which follows the BB line of (a).

7A and 7B are plan views showing the structure of a mechanical drum brake device.

FIG. 8 is an enlarged view of a conventional cam lever.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 20 motorcycle 23 engine 27 front wheel 32 rear wheel 36 rear brake device (brake device) 37 rear wheel wheel 38 rear wheel hub 39 brake drum 40 brake plate 41 anchor pin 42 brake shoe 43 brake cam 44 cam lever (brake actuating member) 47 brake Rod (brake transmission member) 48 Brake pedal (brake operation member) 49 Pin hole 50 pin 51 Rod hole (transmission member hole) 52 Screw thread 54 Adjustment nut 55 Light hole

Claims (1)

[Claims] 1. A brake transmission member connecting a brake operation member and a brake operation member is coupled to the brake operation member via a pin, and the brake transmission member is inserted into a transmission member hole formed in the pin. A braking device for a motorcycle, wherein the pin has a lightening hole in addition to the transmission member hole.