JPH02510Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an improvement of an open-top type floating disc brake.

(b) Prior art and its problems Open-top disc brakes have a roughly rectangular window hole in the center of the caliper, and a pair of brake pads are inserted oppositely into these holes and supported by a guide pin. Since the pad can be pulled out in the radial direction of the disc rotor through the window hole, the pad can be attached and detached while the caliper is fixed, resulting in excellent workability when replacing the pad.

By the way, in the conventional disc brake of this type, the pad pressing surface of the outer caliper and the back metal back surface of the pad that abuts the surface are formed entirely flat, so that there is no problem in pulling out the pad. However, the flat pad of the backing metal generally has a molded hole in the lining material passed through the back of the backing metal, and therefore, rust occurs at the bonding interface between the lining and the backing metal due to water seepage through this hole. However, there is a risk that the lining may peel off easily.
It has been considered to use a pad 1 as shown in FIG. 1, that is, a pad in which a recess 3 is formed by stamping out on the joint surface of the back metal 2 and a part of the lining 4 is filled in this recess.

However, since this pad produces a protrusion 5 on the back metal back, when this pad is assembled into a conventional open-top disc brake, the protrusion 5 and the brake piston are on the inner side, while the protrusion 5 is on the outer side. and the outer caliper interfere with each other, making it difficult to assemble and remove the pad.

As a solution to this problem, a method of removing the protrusion 5 by machining may be considered, but this method has the disadvantage of increasing extra processing cost and losing the effect of increasing the rigidity of the back metal due to the protrusion, resulting in a large amount of waste.

The purpose of this invention is to provide a disc brake that eliminates the above-mentioned problems.

(c) Means for solving the problem This invention consists of the pads shown in Fig. 1, each having a recess for a lining mold in the center on the front side of the back metal, and a protrusion corresponding to the recess on the back side of the back metal. is used for both the inner and outer parts, and in addition, a recess is provided in the center of the pad pressing surface of the outer caliper, which is located almost opposite the center of the brake piston, to avoid interference with the protrusion on the back of the pad back metal. In an open-top type disc brake where one end of the recess is opened at the top of the caliper to a width wider than the width of the protrusion in the disc rotational direction, the dimension of the protrusion on the back plate in the disk axial direction is facing from the pad pressing surface of the outer caliper. The main purpose of this method is to set the distance to be smaller than the distance to the end face of the disc rotor.When replacing the pad, first remove the outer caliper, and then use the space left by the pad to replace the caliper. Slide it to the inner side,
When sufficient space is secured between the disc rotor and the inner pad, the inner pad is moved toward the rotor and pulled out to the outer periphery of the caliper.

(d) Examples Examples of this invention will be described below with reference to the attached FIGS. 2 and 3.

As shown in the figure, the caliper 10 includes an inner caliper 12 into which a brake piston is inserted, and an outer caliper 13 that includes a bridge portion 13a that straddles a disc rotor D on both sides with bolts (not shown).
It is slidably supported by two guide bolts 14, 14 whose one ends are threadedly connected to the fixing member A.

In addition, a pair of pads 1, 1 are arranged facing each other with the disk rotor D at the center in a substantially rectangular window hole 15 formed in the center of the caliper 10, and each pad faces in the axial direction of the rotor. Guide pins 16, 16 inserted from the outer side of the caliper
is slidably supported through the hole 6 of the back metal 2. Note that the guide pin 16 can be pulled out from the caliper by removing the retaining clip 17 that is locked in the middle.

Next, a recess 18 is provided in the center of the pad pressing surface of the outer caliper 13, which is a feature of the present invention. The dimensions are large, and one end is open at the top of the caliper 10, so when the guide pin 16 is removed, the outer pad 1
can be pulled out in the radial direction of the rotor (in the direction of the arrow in Figure 3). Note that if the recess 18 is too large, the pressing area of the outer pad will be reduced, and the pressing surface will be biased to both sides of the pad, and the strength and rigidity of the outer caliper will also be reduced, so the size is necessary. It is desirable to keep it to a minimum.

To replace the disc brake pads as described above, remove the guide pin 16, first pull out the outer pad 1 from the window 15, then use the empty space to move the caliper 10 to the inner side. Since a space is created between D and the inner pad so that the protrusion 5 of the pad 1 can come out from the piston 11, the inner pad can be pulled out to the outer periphery of the caliper.

(e) Effects As explained above, this invention has an open recess at the top of the caliper in the center of the pad pressing surface of the outer caliper to avoid interference with the protrusion on the back of the pad, and a recess on the back of the pad back metal. Since the dimension of the protrusion in the disk axial direction is set to be smaller than the distance from the pad pressing surface of the outer caliper to the disk end face facing it, a pad with protrusions on the back side of the back metal is used to improve rigidity and waterproofness. However, the replacement work will not be hindered.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a pad used in the disc brake of this invention, Fig. 2 is a plan view showing an example of the disc brake of this invention, and Fig. 3 is a sectional view of a pad used in the disc brake of this invention.
FIG. 1... Padded, 2... Back metal, 5... Protrusion, 10
... Caliper, 11... Piston, 12... Inner caliper, 13... Outer caliper, 14
... Guide bolt, 15 ... Window hole, 16 ... Guide pin, 17 ... Stopping clip, 18 ... Recess,
A...Fixing member, D...Disc rotor.

Claims (1)

[Scope of utility model registration request] In the approximately rectangular window hole in the center of the caliper,
Each has a recess for a lining mold in the center of the front surface of the back metal, and a pair of brake pads of the same shape with a protrusion corresponding to the recess on the back surface of the back metal. The disc rotors are inserted facing each other into the inner diameter hole of the cup-shaped brake piston, and each brake pad is slid in the longitudinal direction of the pin using a guide pin that is attached to the caliper and faces in the axial direction of the disc rotor. A recess is provided in the center of the pad pressing surface of the outer caliper, which is freely supported and is located almost opposite the center of the brake piston, to avoid interference with the protrusion on the back surface of the pad, and one end of the recess is provided. In a disc brake in which a protrusion on the top of the caliper is opened wider than the width in the disc rotational direction, the dimension of the protrusion in the disk axial direction is set to be smaller than the distance from the pad pressing surface of the outer caliper to the end face of the disc rotor facing it. An open top type floating disc brake with a unique feature.