JPH0751433Y2 - Disc brake for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Field of Industrial Use) This invention relates to a disc brake of a motorcycle, and in particular, it is suitable for a rear brake of an off-road vehicle such as a motocrosser. Disc brakes for wheeled vehicles.

(Prior Art) An off-road motorcycle called a motocrosser that travels in a mountainous area such as a rough land or a terrain with a lot of undulations has a vehicle body frame 2 equipped with an engine 1 as shown in FIG. A swing arm 3 is pivotally supported at a rear portion of the swing arm 3 so as to be vertically swingable, and a rear wheel 5 is supported on a rear end of the swing arm 3 via a rear axle 4, and a disc brake is provided on the rear wheel 5. There is.

In this disc brake, as shown in FIG. 5, a disc 7 is provided on a hub 6 of a rear wheel 5 pivotally supported on the rear end of a swing arm 3 and a base portion of a caliper bracket 8 is supported on an axle 4 as shown in FIG. A caliper 9 is provided on the upper end of the tip of the caliper bracket 8 to clamp the disc 7, and the caliper 9 is located above the swing arm 3 and engages with the disc 7 of the rear wheel 5 to apply a brake. It is like this.

(Problems to be Solved by the Invention) However, in the conventional disc brake structure for a motorcycle, since the caliper 9 is located above the swing arm 3, this caliper will be used when the motorcycle falls over. There is a risk that 9 may be damaged by hitting the ground or rocks protruding to the ground, impairing the caliper function. Therefore, conventionally, a protective measure has been taken by separately providing a protective component such as a caliper guard on the caliper 9, but this increases the number of components and the number of assembling steps, resulting in an increase in cost.

This invention was made in view of the above points, and was made in order to solve the problems of the conventional technique. Even if the motorcycle falls over without damaging the caliper guard or other parts, the caliper will be damaged. The present invention provides a disc brake for a motorcycle that can prevent it from being received in advance.

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above object, the present invention is directed to a swing arm that is pivotally supported at a rear portion of a body frame so as to be vertically swingable, and a rear end of the swing arm via a rear axle. In a motorcycle having a caliper that supports a wheel and a disc and presses the disc to brake the caliper, the caliper is provided at a tip end side of a caliper bracket supported by a rear axle, while the caliper bracket is the swing. A recess, which is located between the inner side of the arm and the rear wheel, and into which a part of the caliper on the swing arm side can be fitted is formed on the inner surface of the swing arm, and a part of the caliper on the swing arm side is formed in the recess. Is fitted loosely and the caliper is hidden inside the swing arm.

(Operation) In this motorcycle disc brake, since the caliper is provided on the tip side of the caliper bracket supported by the rear axle, even if the rear axle is moved in the front-rear direction when adjusting the tension of the chain, the rear axle does not move. Since the caliper also moves with the movement of, the caliper and the disk do not move relative to each other, and the caliper does not need to be adjusted.

Further, since a part of the caliper on the swing arm side is loosely fitted in a recess formed in the inner surface of the swing arm, the recess allows the caliper to move in the front-rear direction by adjusting the tension of the chain. When the motorcycle falls, the caliper is hidden inside the swing arm, so the caliper is not directly impacted, and the swing arm protects and prevents the caliper from being damaged.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a front view of an embodiment of the present invention, and FIG. 3 shows a plane in which the same part is shown as a cross section. At the rear end of the swing arm 3, there are elongated holes 10, 10 extending in the front-rear direction, and a slide bearing member 11 is movably inserted in the front-rear direction inside the swing arm 3 of the elongated holes 10, 10. The rear axle 4 of the rear wheel 5 is inserted into the slide bearing member 11 through the elongated hole 10, and the rear axle 4 is attached to the outer surface of the swing arm 3 by a nut.
Tightened and supported by 12. A disc 7 is fixed to a hub 6 of a rear wheel 5, and a rear axle 4 between the disc 7 and the swing arm 3 has a base portion of a caliper bracket 8 inserted therein and supported in a cantilever beam shape. A caliper 9 is provided at the tip (free end) of the. The caliper 9 is provided with pads 16 that can press the disk 7 from both sides.

An adjusting bolt 13 for adjusting the tension of the chain is inserted at the rear end of the swing arm 3, and a large diameter portion 13a at the inner end of the adjusting bolt 13 is engaged with the slide bearing member 11 so that the adjusting bolt 13 The tension of the chain is adjusted by sliding the slide bearing member 11 by rotating the nut 14 screwed to the outer end side.

In this invention, a recess 15 into which a part of the caliper 9 can be fitted is formed on the inner surface side of the swing arm 3. The recess 15 has a width L in the front-rear direction that allows the movement of the caliper 9 along with the movement of the rear axle 4 in the front-rear direction when adjusting the tension of the chain. This recess 15
In addition to having a recessed shape in which the four sides are surrounded as shown in FIG. 3, a recessed part 15 'in which the upper part is opened at the upper part on the inner surface side of the swing arm 3 as shown in FIG. It may be.

2 and 3, 16 is a pad of the caliper 9, 17 is a steady rest of the caliper bracket 8 and 18
Is a pipe for supplying brake oil connected to the caliper 9, and 19 is a chain wheel.

Next, the operation will be described.

When the brake is applied, the brake oil pumped by the brake operation causes the pads 16, 16 of the caliper 9 to clamp the disk 7 from both sides to brake the rear wheel 5. Movement of the caliper 9 in the front-rear direction by adjusting the chain tension is allowed by the front-rear width L of the recess 15, and the chain tension can be freely adjusted. The caliper bracket 8 tries to swing in the traveling direction (rotational direction) of the rear wheel 5 due to the braking action of the caliper 9, but the runout of the caliper bracket 8 is caused by the steady rest 17 of the caliper bracket 8 and the concave portion of the swing arm 3. It can be regulated by 15.

When the motorcycle falls, the swing arm 3 may collide with the ground or an obstacle, but since the caliper 9 is hidden inside the swing arm 3, no direct impact is applied. It is possible to prevent the caliper 9 and the caliper bracket 8 from being damaged.

[Effect of device]

As described above, in the disc brake of the motorcycle according to the present invention, the caliper is provided on the front end side of the caliper bracket supported by the rear axle, and the caliper bracket is connected to the inside of the swing arm and the rear wheel. Since the caliper is partially inserted on the swing arm side in the recess formed on the inner surface of the swing arm, the rear axle can be moved back and forth when adjusting the tension of the chain. However, the caliper follows and moves, the relative displacement between the caliper and the disk does not occur, and there is no need to adjust the caliper, and a part of the caliper on the swing arm side is loosely fitted in the recess of the swing arm. Therefore, the movement of the caliper in the front-rear direction due to the adjustment of the chain tension can be allowed. The caliper braking action tends to cause the caliper bracket to swing in the rotational direction of the rear wheel, but the swinging of the caliper bracket and the caliper can be reliably regulated by the recess of the swing arm.

Further, even if the motorcycle falls over, the caliper is protected by the swing arm and is not directly impacted, and the caliper can be prevented from being damaged. Moreover, since it is not necessary to separately provide a caliper guard as in the conventional case, the number of parts is reduced, the assembly is simplified, and the caliper guard can be obtained at low cost. Furthermore, since a part of the caliper on the swing arm side is fitted in the recess on the inner surface of the swing arm, various effects such as a reduction in the installation space of the caliper can be achieved.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a motorcycle to which the present invention is applied, FIG. 2 is a front view showing an embodiment of a disc brake of the motorcycle according to the present invention, and FIG. 3 is the disc brake. FIG. 4 is a plan view showing a part of the cross section of FIG. 4, FIG. 4 is an explanatory view showing a modified example of the concave portion, and FIG. 2 ... Body frame, 3 ... Swing arm, 4 ... Rear axle, 5 ... Rear wheel, 7 ... Disc, 8 ... Caliper bracket, 9 ... Caliper, 15,15 '... Recessed part.

Claims (1)

[Scope of utility model registration request] 1. A swing arm is pivotally supported at a rear portion of a vehicle body frame so as to be vertically swingable, and a rear wheel and a disc are supported at a rear end of the swing arm via a rear axle, and the disc is clamped for braking. In the motorcycle having the caliper, the caliper is provided on the tip side of the caliper bracket supported by the rear axle, while the caliper bracket is located between the inside of the swing arm and the rear wheel. A concave portion into which a part of the caliper on the swing arm side can be fitted is formed on the inner surface of the swing arm, and a part of the caliper on the swing arm side is loosely fitted into the concave portion to hide the caliper inside the swing arm. Disc brakes for motorcycles characterized by