JPH0156291B2 - - Google Patents

Description

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

As shown in FIG. 1, the floating caliper type disc brake has a piston 2 fitted into a cylinder 5 bored in the rear arm 1a of the caliper.
Abut the inner pad 3 on the front of the piston 2,
Further, the outer pad 6 is brought into contact with the caliper forearm 1c which is connected to the caliper rear arm 1a via the caliper body 1b, and both pads 3, which are a pair of friction pads,
6 are disposed on both sides of the disk 7, and a support 4 attached to the vehicle body adjacent to the disk 7 supports the caliper 1, which straddles the disk 7 and a pair of pads 3 and 6, in a freely floating manner. By introducing pressure oil into the cylinder 5 of the hydraulic actuator through a brake pipe (not shown), the inner pad 3 is pressed against the disk 7, and the reaction force thereof presses the outer pad 6 against the disk 7. Braking force is generated by compressing a rotatable disc 7 fixed to the wheel. Conventionally, in this type of caliper, the caliper forearm, caliper body, and caliper rear arm were made integrally 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 central portion was formed into a bifurcated shape. 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 efforts have been made to reduce it through various improvements from the mechanical aspects of the caliper, support structure, etc., and from the friction material aspects of the disc, etc.
No complete preventive measures have been proposed yet, and at present the only way to reduce it is to adopt a combination of various proposals.

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 inner pad is due to the forearm of the caliper in contact with the outer pad, which This is facilitated by becoming a division. In other words, the caliper forearm is fixed to the outer pad so that its position cannot be changed, and it always contacts the outer pad at a fixed position, so the caliper forearm suppresses the part that becomes the antinode of self-excited vibration of the pad when brake noise occurs. However, it has been experimentally determined that the narrower the distance between the forked parts of the caliper forearm is, the more effective it is in reducing brake noise. It is necessary to do so, and it cannot be made any narrower than it currently is.

Furthermore, a floating caliper type disc brake in which the caliper forearm is separate from the caliper rear arm and these are connected by two tension rods to form a caliper is disclosed in Japanese Patent Laid-Open No. 140767/1983. There is.

However, with this disc brake, the caliper forearm that comes into contact with the outer pad
Since the disk was attached to the caliper body so that it could not be moved in the circumferential or radial direction, it was not possible to change the contact area of the caliper forearm to the outer pad, which resulted in the antinode of self-excited vibration of the outer pad. brake noise could not be reduced.

In view of the above-mentioned circumstances, the present invention improves the machining work of the cylinder part by separating at least a part of the caliper forearm from the caliper body and making it an abutting part movable in the circumferential direction or radial direction of the disk with respect to the caliper body. The objective is to provide a floating caliper type disc brake that can reduce brake noise while ensuring high performance.

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

FIGS. 2 and 3 show a first embodiment, in which a caliper main body 10 is composed of a caliper rear arm 11 having a cylinder 20 formed therein, and a caliper body 12, and a conventional caliper forearm is connected to a vehicle of the caliper main body 10. The end face 13 of the carrier body 12 is formed by cutting along a plane perpendicular to the axis of the disk in the attached state. Notches 14 and 15 are provided in the center of the carrier body 12 from both sides, and an overhanging portion 1 is formed between the notches 14 and 15 and the end surface 13.
Elongated holes 16 and 17 in the left and right direction as shown in the figure are bored in holes 2a and 12b for bolt insertion. Reference numerals 18 and 19 denote melon-shaped support members that will become the forearms of the caliper, and form a contact portion to the outer pad, and have through holes and elongated holes 16 and 17 for bolts 21 and 22 bored at one end of the support members 18 and 19, respectively. and nuts 23 and 24.
It is fixed to the carrier body 12 by tightening the screws. The support members 18 and 19 have elongated holes 16 and 19, respectively.
The end face 1 of the carrier body 12
Since 3 forms a flat surface, it can be installed at an angle within the illustrated angle β. Therefore, for the outer pad (not shown), the installation interval and inclination angle can be arbitrarily selected when the disc brake is assembled.
It will be abutted and supported by support members 18 and 19 whose abutting parts have been appropriately moved in the circumferential direction or radial direction of the disc (not shown), and the spacing will be narrower than that of the conventional caliper forearm, especially after machining the 20 part of the cylinder. By attaching the support members 18 and 19 to each other, brake noise can be reduced.

FIG. 4 shows a caliper main body 10' having a shape obtained by cutting out half of the conventional bifurcated forearm of the caliper, and a movable and rotatable caliper body 10' attached to the cut end surface 13' using the same mounting means as in the first embodiment. A second embodiment is shown in which a support member 18' is attached and the remaining portion 25 and the support member 18' form an abutting part for the forearm of the caliper. By appropriately changing the mounting position of the support member 18', substantially the same effects as in the first embodiment can be obtained.

5A and 6 show that a conventional caliper forearm is cut out along a plane perpendicular to the disk axis when the caliper main body 10 is attached to a vehicle to form an end surface 27 of the caliper body 26. A third embodiment is shown in which support members 28 and 29 are fixed with stud bolts 30 and 31. In this case, each support member 28, 29 cannot be moved laterally, but by tilting it within an angle β using the stud bolts 30, 31 as a fulcrum, the contact portion to an outer pad (not shown) can be moved around the circumference of the disk relative to the carrier body 26. Slight changes in direction or radial direction may be made to reduce brake noise. In addition, FIG. 5B shows each support member 2.
In order to prevent each support member 28', 29' from rotating from the fixed position due to slight loosening of the stud bolts 30, 31 when the studs 8', 29' are fixed with the stud bolts 30, 31, A plurality of radial grooves 50, 51 are formed as rotation prevention means on the contact surface between each of the support members 28', 29' and the end surface 27 of the carrier body 26. It is also possible to prevent unpreventable rotation. A fourth embodiment is shown in FIGS. 7 and 8, in which a notch is cut out in the center of the fork-shaped caliper forearm 34 of a conventional caliper, and the caliper can be attached to and removed from the central part, and the disc can be attached in the circumferential direction with respect to the caliper body 33. Or a support member 3 serving as a radially movable abutment part.
2 is firmly attached, and the support member 32 is
A bolt 35 is inserted between a through hole 33a at the center of the caliper body 33 and a center portion on the side of the forearm 34 of the caliper, and a nut 36 is screwed and tightened to secure the body. According to this embodiment, the support member 3 abuts and supports the central portion of the outer pad (not shown), which was not abutted and supported by the forearm of the conventional caliper, thereby making it possible to reduce brake noise.

Furthermore, by rotating the support member 32 about the bolt 35 and moving the contact portion to the outer pad in the circumferential direction or radial direction of the disk, the antinode of the self-excited vibration can be accurately brought into contact with the support member 32. This can be used to reduce brake noise.

FIG. 7 shows a fifth embodiment, and each of the above-mentioned embodiments includes a support member 41 which is a detachable part of the forearm of the caliper and is an abutting part movable in the circumferential direction or radial direction of the disk with respect to the caliper body 43. , 42 have different fixing means. In other words, Kyaripa body 43
A guide protrusion 44 having a T-shaped cross section is formed on the end face, and a matching groove with a T-shaped cross section is formed in the pair of support members 41, 42. Further, a plurality of insertion holes 46 are provided at the upper edge of the guide projection 44 into which locking pins 45 serving as fasteners are inserted. Therefore, the support member 4
1 and 42 are attached to the guide protrusion 44 from the side of the end thereof, and the locking pins 45 are inserted into the insertion holes 46 on both sides of the support members 41 and 42 at appropriate positions to position the contact member. The contact portions 41 and 42 that contact the outer pad can be moved in the circumferential direction or radial direction of the disk, and in particular, compared to a conventional caliper forearm, it is possible to support the central portion of the outer pad (not shown). , self-excited vibration of the outer pad can be suppressed.

As explained above, according to the present invention, at least a portion of the contact portion of the caliper forearm to the outer pad is separated from the caliper body and is movable relative to the caliper body in the circumferential direction or radial direction of the disk. While ensuring machining workability of the cylinder part of the rear arm of the caliper, the forearm of the caliper can contact and support the antinode of the self-excited vibration of the outer pad as accurately as possible, suppressing the self-excited vibration of the outer pad. brake noise can be reduced.

In addition, during the design stage of a disc brake, you are freed from the difficult task of predicting the generation of brake noise and the antinode of self-excited vibration of the outer pad. The position of the caliper forearm that minimizes the

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional floating caliper type disc brake, and Fig. 2 is a longitudinal sectional view of a conventional floating caliper type disc brake.
3 is a front view, FIG. 4 is a perspective view showing the second embodiment of the present invention, FIG. 5 A is a perspective view showing the third embodiment, and B is the third embodiment. An explanatory diagram showing an example in which the support member is provided with rotation prevention means in the embodiment, FIG. 6 is a partial sectional view showing the attachment state of the support member in the third embodiment, and FIG. 7 is a fourth embodiment of the present invention. 8 is a front view showing the A-A of FIG.
FIG. 9 is a perspective view showing a fifth embodiment of the present invention. 1...Kyaripa, 1b...Kyaripa body, 1
c... Caliper forearm, 4... Support, 6... Outer pad (one friction pad), 12, 26,
33, 43...Kyaripa body, 18, 18',
19...Supporting member, 28, 28', 29, 29'...
...Support member, 32...Support member, 34...Caliper forearm, 41, 42...Support member.

Claims (1)

[Claims] 1. A rotatable disk, a support fixed to the vehicle body adjacent to the disk, a pair of friction pads arranged on both sides of the disk, and a support that straddles the disk and the pair of friction pads and is supported in a freely floating manner on the support. Caliper is equipped with
In a floating caliper type disc brake having a caliper forearm that presses one of the friction pads by the reaction force of a built-in hydraulic actuator, the caliper forearm has its contact portion with one of the friction pads pressed against the caliper body. 1. A floating caliper type disc brake, which is supported movably in the circumferential or radial direction of the disc.