JPS6240179Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of pneumatic disc brakes, which are used especially for large vehicles among the disc brakes used for braking automobiles. The purpose is to reduce the noise generated.

A pneumatic disc brake is configured as shown in FIG. 1, for example. That is, a pair of front and back pads 2, 2 sandwiching the rotor 1 rotating together with the vehicle.
, support both ends of the torque plate 4, 4
Install it in contact with pin 5 of support 3.
A piston built into a caliper 6 that is slidably mounted on the pad 6 and caliper claws 6a, 6a formed at the ends of the caliper 6 are configured to press the back surfaces of the pads 2, 2. When performing braking, one pad 2 is applied via an air chamber 8 provided in the bracket 7 to a piston installed in the caliper 6 by a pneumatic device (not shown).
When the (inner side pad) is pressed against the side surface of the rotor 1, the caliper 6 slides in the direction of arrow a due to the reaction, and the other pad 2 (outer side pad) is pushed to the other side of the rotor 1 via the caliper claws 6a, 6a. Control is performed by pressing against the end face and strongly holding the rotor 1 from both sides.

By the way, in the pneumatic disc brake constructed and operated in this manner, in order to apply the pressing force from the piston evenly to the inner pad, the end surface of the piston 9 and the pad 2 are connected as shown in FIG. A thick steel plate 10 called a back plate, which is long in the circumferential direction of the rotor, is thicker than the back metal of the pad, and can apply the pressing force of the piston applied to the center evenly to the entire surface of the pad is installed between the pad and the back surface. I was holding it in place. However, conventional thick steel plates are used on the inlet side (anti-anchor side) of the rotor 1 in the rotational direction.
Because it was built symmetrically so that the exit side (anchor side) and the exit side (anchor side) were the same, it caused the following inconvenience.

That is, during braking, the side of the pad 2 opposite to the anchor tends to bite into the side surface of the rotor 1, and may come into strong friction with this side surface. In this way, when the side of the pad 2 opposite to the anchor strongly rubs against the side surface of the rotor 1, the entire pad 2 vibrates finely, producing unpleasant noise.

The pneumatic disc brake of the present invention was devised in order to suppress the generation of noise as described above. It's lower than that.

Hereinafter, the present invention will be explained in more detail with reference to drawings showing embodiments.

FIG. 3 shows an embodiment of the invention. The thick steel plate 10 held between the back surface of the pad 2 on the inner side and the end surface of the piston 9 has a thickness on the anchor side (upper side when the rotor rotates from bottom to top as shown by arrow b) and on the opposite side to the anchor. It makes the difference. That is, the plate thickness of the anti-anchor side portion is formed to be thinner than the plate thickness of the anchor side portion, and the rigidity of the anti-anchor portion is made lower than the rigidity of the anchor portion.

With this configuration, when the thick steel plate 10 is pressed by the piston 9, the force with which the pad 2 is pressed is slightly weaker on the side opposite to the anchor than on the anchor side. In this way, by making the pad pressure on the anti-anchor side weaker than on the anchor side, it is possible to prevent the anti-anchor side pad from vibrating into or away from the rotor side surface, and the piston's pressing force can be applied appropriately to almost the entire surface of the pad. By being dispersed, repeated vibratory deformation of the pad is prevented, and noise generation can be suppressed.

In order to make the rigidity of the thick steel plate different between the anchor side and the anti-anchor side, in addition to changing the plate thickness as described above, as shown in Figure 4, the width on the anti-anchor side (lower side in the drawing) must be changed. It may be narrower than the width on the anchor side (upper side in the drawing). The effects in this case are also the same as in the case where the plate thicknesses are different as described above.

In order to prevent disc brake noise from occurring, pad pressing has been adjusted in various ways in the past, such as one in which the pads are evenly pressed against the rotor (Japanese Utility Model Publication No. 54-118987),
There is a method that presses the anchor side of the pad against the rotor more strongly than the opposite side of the pad (Japanese Patent Publication No. 39-22441), but as mentioned above, the present invention has a structure different from these known techniques, and the above-mentioned This simple configuration can effectively prevent the generation of unpleasant noise during braking, and has a great practical effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a pneumatic disk brake to which the present invention is applied, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a cross-sectional view corresponding to line B-B in Fig. 2 showing a first embodiment of the present invention, and Fig. 4 is a cross-sectional view corresponding to line C-C in Fig. 3 showing a second embodiment of the present invention. 1: rotor, 2: pad, 3: support, 4:
Torque plate, 5: pin, 6: caliper, 6
a: caliper claw, 7: bracket, 8: air chamber, 9: piston, 10: thick steel plate.

Claims (1)

[Scope of utility model registration request] A thick steel plate 10, which is longer in the circumferential direction of the rotor 1 and thicker than the back metal of the pad 2, is capable of applying the pressing force of the piston 9 applied to the center evenly to the entire surface of the pad, by means of a piston 9 driven by air pressure.
A pneumatic disc brake that presses one pad 2 against the side surface of the rotor 1 through a pneumatic disc brake, characterized in that the rigidity of the thick steel plate 10 on the side opposite to the anchor is lower than the rigidity on the anchor side. brake.