JPS58102833A - Caliper for floating caliper type disc brake - Google Patents

Abstract

PURPOSE:To reduce brake noise under securing the working operability of a cylinder by a method wherein a part of the fore arm of the caliper is separated from a caliper body so as to be detachable. CONSTITUTION:Supporting members 18, 19 are secured to the caliper body 12 by penetrating bolts 21, 22 through the through holes bored at one end of the members and the long holes 16, 17 of the caliper body 12 and clamping them with nuts 23, 24. The supporting members 18, 19 are attached by selecting the mutual intervals properly by moving them with respect to the long holes 16, 17 while the end face 13 of the caliper body 12 forms a plane, therefore, it may be attached in an inclined condition within a range of a given angle. Accordingly, the brake noise may be reduced by attaching the supporting members 18, 19 after the working of the cylinder 20 with intervals narrower than the fore arm of the conventional caliper.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a caliper that prevents brake noise in a floating caliper type disc brake.

As shown in Fig. 1, the floating caliper type disc brake has a piston 2 fitted into a cylinder S drilled in the rear arm 1a of the caliper, an inner pad 3 in close contact with the front surface of the piston 2, and a cylinder S formed in the rear arm 1a of the caliper. The outer pad 6 is in contact with the caliper forearm 1c which is connected to the arm 1a via the caliper body 1b, and the caliper 1 is supported in a floating manner by a support number attached to the vehicle body side. By introducing pressure oil into the cylinder 5 through a brake pipe (not shown), the disc 7 is fixed to the wheel by both pads 3 and 6.
It squeezes and generates braking force. Conventionally, in this type of caliper, the caliper forearm, caliper body, and caliper rear 1 were manufactured as one unit by casting, and due to the machining work of the cylinder part of the caliper rear arm, the caliper forearm was formed into a bifurcated shape and the center It is unavoidable to secure a working space in the area.

Therefore, the brakes may generate an unpleasant "squeak" sound just before the vehicle stops. This unpleasant noise is called brake noise, and various improvements have been made to reduce it from the mechanical aspects of calipers, support structures, and friction materials such as discs, but no complete prevention measures have yet been proposed. Currently, the only way to reduce this is by adopting a variety of proposals in combination.

One of the causes of brake noise is a phenomenon in which self-excited vibrations of pads pressed against the braking surface of a disc during braking cause components of the disc brake, such as the caliper and disc, to resonate. Examining this phenomenon on the caliper forearm side of a floating caliper type disc brake, that is, the outer pad side, we find that the self-excited vibration of the outer pad is due to the fact that the caliper forearm in contact with the outer pad is structurally fixed as described above. It is encouraged by becoming a partner. In other words, when brake noise occurs, the part that becomes the antinode of automatic vibration of the pad cannot be suppressed by the caliper forearm, and experiments have shown that the narrower the distance between the forked parts of the caliper forearm is, the more effective it is in reducing brake noise and noise. However, the two prongs are necessary for the machining work of the cylinder section, and cannot be made any narrower than the present condition.

In view of the above circumstances, the present invention aims to provide a caliper that can reduce brake noise while ensuring workability of the cylinder part by separating at least a part of the caliper forearm from the caliper body and making it detachable. The purpose is

The present invention will be explained below based on illustrated embodiments.

2 and 3 show a first embodiment, in which a caliper body 10
(The caliper rear arm 11 has a cylinder 20 formed inside.
and a caliper body 12, and the conventional caliper forearm is cut off along a plane perpendicular to the axis of the disc in the state in which the caliper body 10 is attached to the vehicle to form an end surface 13 of the caliper body 12. caliper body 1
2 has a notch of 14°15 from both sides in the center,
An overhanging portion 12m between the notch 14.15 and the end surface 13
, 12b are provided with elongated holes 16 and 17 in the horizontal direction at an angle in the drawing for bolt insertion. Reference numerals 18 and 19 are claw-shaped support members that become the forearms of the caliper, and bolts 21 and 22 are formed in one end of the support members 18 and 19, respectively, through holes and elongated holes 16 and 16.
17 and tightened with nuts 23 and 24 to fix it to the caliper body 12.

The support members 18 and 19 are respectively moved relative to the elongated holes 16 and 17 and installed with appropriate mutual spacing,
Also, since the end face 13 of the caliper body 12 forms a flat surface, it can be mounted by tilting it within the range of the angle β shown.

Therefore, when the disc brake is assembled, the outer pad (not shown) is mounted and supported by support members 18 and 19 whose spacing and angle of inclination are arbitrarily selected.
Particularly, brake noise can be reduced by attaching the support members 18 and 19 at a narrower interval than the conventional caliper forearm after machining the cylinder 20 section.

In Fig. 4, the caliper main body 1 has a shape obtained by cutting out half of the conventional bifurcated forearm of the caliper, and is mounted on the cough cutting end surface 13' by means similar to the first embodiment, so that it can be moved and rotated. A second embodiment is shown in which the support member 18' is attached and the remaining portion 25 and the g* support member 18' constitute a caliper forearm. By appropriately changing the mounting position of the support member 18', substantially the same effect as in the first embodiment can be produced.

5(A) and 6 show that the conventional caliper forearm is cut off along a plane perpendicular to the axis of the disc in the state in which the caliper body 10 is mounted on the vehicle, thereby forming the end face 27 of the caliper body 26. A third embodiment is shown in which support members 28 and 29 are fixed to the cough end face 27 with stud bolts 30 and 31.

In this case, each support member 28, 29 cannot be moved laterally, but
By tilting the stud bolts 30 and 31 within the range of angle β using the stud bolts 30 and 31 as a fulcrum, it is possible to change the support location of the outer pad (not shown), thereby reducing brake noise. Furthermore, the fifth
Figure (q shows each support member zs', z9/ with stud bolt 3
When fixed at 0.31, the stud bolt 30
．． Due to slight loosening of 81, the stand support members 2g' and 29'
In order to prevent the caliper from rotating from the fixed position, a plurality of radial grooves 50, 51 are formed as rotation prevention means on the contact surface between each support member 28', 29' and the end surface 27 of the caliper body 26. This makes it possible to prevent the rotation of the toothed washer that cannot be prevented by the scissors. 7th wI
, FIG. 8 shows a fourth embodiment, in which a removable support member 32 is vertically and rigidly attached to a notch in the center of the fork-shaped caliper forearm 34 of a conventional caliper. The support member 32 has a through hole 33m in the center of the caliper body 33.
A bolt 35 is inserted between the center part of the caliper arm 34 side, and a nut s6 is screwed and tightened to fix the bolt 35. According to this embodiment, the support member 32 supports the central portion of the outer pad (not shown), which was not supported by the forearm of the conventional caliper, thereby making it possible to reduce brake noise.

FIG. 9 shows a fifth embodiment, in which a U-shaped support member 38 is implanted in the end face 31 of a caliper body formed in the same manner as in the first and third embodiments, with the connecting portion 38m downward.
It is removably fixed at 11.40. The stud bolts 39 and 40 can be replaced with through bolts by using the structure shown in FIG. In this embodiment, as in the fourth embodiment, the central portion of the outer pad (not shown) is supported to suppress automatic vibration of the outer pad.

FIG. 10 shows a sixth embodiment, which differs from the above-mentioned embodiments in the means for fixing detachable support members 41, 41 constituting the forearm of the caliper. That is, a guide protrusion 44 having a T-shaped cross section is formed on the end face of the caliper body 43, and a - set of support members 41 is formed.
．． 42 is formed with a matching groove having a T-shaped cross section. Further, the upper edge of the guide projection 44 is provided with a plurality of insertion holes 46 into which locking pins 4s serving as fasteners are inserted. Therefore the support member 41.4! is attached to the guide protrusion 44 from the side of the end thereof, and the locking pins 4S are inserted into the insertion holes 46 on both sides of the support member 41.4 at appropriate positions to position it. In comparison, the outer pad (not shown) near the center can be supported, and self-excited vibration of the outer pad can be suppressed.

As explained above, according to the present invention, at least a part of the support portion of the outer pad of the caliper forearm is separated from the caliper body and made detachable, thereby ensuring machining workability of the cylinder portion of the caliper rear arm. At the same time, the forearm of the caliper can support the portion of the outer pad that becomes the antinode of self-excited vibration, thereby suppressing the automatic vibration of the outer pad and reducing brake noise.

In addition, the design stage of the disc brake is freed from the difficult task of predicting the occurrence of brake noise and the antinode of self-excited vibration of the outer pad. , the position and shape of the caliper forearm that minimizes brake noise can be selected.

[Brief explanation of the drawing]

1g is a vertical cross-sectional view of a conventional floating caliper disc brake. FIG. 3 is a perspective view showing the first embodiment of the present invention, ** is a front view, FIG. 4 is a perspective view showing the Sabatomi embodiment of the present invention, and FIG. A perspective view showing the 31I embodiment, (c9 is an explanatory view showing an example in which the support member is provided with rotation prevention means in the 31J embodiment, and FIG. 6 is a partial cross section showing the mounting state of the support member of the 3rd embodiment. Figure, 1st
The figure is a front view showing the fourth embodiment of the present invention, FIG. 8 is a partial sectional view of the moom of FIG. FIG. 3 is a perspective view showing an example of a theory. 1: caliper, 1c: caliper forearm, 1b: caliper body, 4: support, 6: outer pad, 18: caliper body, ts, IIf, t. ;Supporting member,! 8.28', 29. ! 9': support member,
38: Support member, 34; Caliper forearm, 38: Support member, 41.4! : Supporting member. Agent Patent Attorney Front 1) Toshiyuki Figure 1 Figure 2 Figure 3 - Figure 4 Old' Figure 5 (A) (B) Figure 6 Figure 8 Figure 9 Figure 80 Figure 10 Figure 19

Claims (1)

[Claims] 1. In a floating caliper type disc brake caliper that is floatingly supported on a support fixed to the vehicle body, at least a portion of the caliper forearm that closely contacts the outer pad is configured with a support member that is detachable from the caliper body. This is a floating caliper type disc brake caliper.