JP2004218696A - Pad clip for disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably increase a force for pressing a rear plate 6 of a pad in the peripheral direction of a rotor and stably suppress a hitting sound generated when applying brake. <P>SOLUTION: A pad clip 12 is provided between the rear plate 6 and an engaging part 4 of a support 1 to suppress the play of the rear plate 6 when not applying brake and suppress a hitting sound generated when applying brake. The rear plate 6 is elastically pressed in the peripheral direction of the rotor by a pressing part 14b and a second abutting part 24 to suppress the hitting sound. The problem can be solved by making the torque transmission face 16 of a rear plate 6 side hardly collide with the torque receiving face 17 of a support 1 side with great force by an amount of increasing a force to press the rear plate 6, at braking. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The pad clip for a disc brake according to the present invention is incorporated into a disc brake for braking an automobile to prevent the back plate of the pad from rattling against the support during non-braking, and to prevent the back plate and the support from braking when braking. It is used to prevent the violent collision.
[0002]
[Prior art]
A disc brake as shown in FIG. 1 is widely used for braking an automobile. In this disc brake, a support 1 provided adjacent to one side of a rotor (not shown) that rotates together with wheels is provided on an inner diameter side (lower side in FIG. 1) of the support 1 in a radial direction of the rotor. It is fixed to the suspension device by bolts (not shown) screwed into the provided mounting holes 2, 2. The caliper 3 is engaged with the support 1 by engaging a pair of guide pins fixed to the caliper 3 with a pair of guide cylinders (not shown) provided on the support 1 so that the axial direction of the rotor ( It is supported so as to be displaceable in the front and back directions in FIG.
[0003]
A part of the support 1 is provided with a pair of engaging portions 4 on both sides with respect to the rotation direction of the rotor at positions separated in the circumferential direction of the rotor. Each of the engaging portions 4 and 4 has a distal end bent in a U-shape so as to straddle the outer peripheral portion of the rotor in the front and back directions in FIG. 1, and sandwiches the rotor between the two engaging portions 4 and 4. Both ends of a pair of pads 5 provided in this state are supported. Each of these pads 5 is formed by attaching a lining 7 to one surface of a back plate 6, and engagement projections 8, 8 formed at both ends of the back plate 6 are respectively connected to the two engagement portions 4, By engaging the engagement grooves 9 formed in the rotor 4, the rotor is slidably supported in the axial direction of the rotor with respect to the engagement portions 4. Note that, of both sides of each of the engagement grooves 9, 9, outer portions in the radial direction of the rotor are partitioned by convex portions 10, 10 formed so as to protrude toward the back plate 6.
[0004]
Further, the caliper 3 having a cylinder portion and a caliper claw 11 is disposed so as to straddle the pad 5, and a piston for pressing the pad 5 against the rotor is built in the cylinder portion. are doing. Further, pad clips 12 are provided between the outer peripheral edges of both ends of the back plate 6 constituting the pads 5 and the support 1. Each of these pad clips 12, 12 is integrally formed of a metal plate having elasticity and corrosion resistance, such as a stainless steel plate, and the back plate 6 of each of the pads 5 rattles against the support 1 when braking is not performed. And at the same time prevent the back plate 6 and the support 1 from violently hitting each other during braking, thereby preventing a striking sound called a clonking sound from being generated during braking. Each of the pad clips 12, 12 also has a function of preventing a sliding portion between each of the back plates 6 and the support 1 from being rusted.
[0005]
Since the pad clips 12, 12 shown in FIG. 1 belong to the embodiment of the present invention, first, a conventionally known pad clip will be described with reference to another FIG. Conventionally, pad clips described in Patent Literatures 1 and 2 have been known as pad clips in which the hitting sound is suppressed. FIG. 11 shows a pad clip 12a described in Patent Document 2 among these.
[0006]
The pad clip 12a shown in FIG. 11 includes a positioning portion 13, a pressing portion 14, and a contact portion 15. The positioning portion 13 is formed in a substantially U-shape, and engages with a convex portion 10 formed on a part of the support 1 so as to protrude toward the back plate 6. Outer fitting) to achieve positioning in the radial direction of the rotor. The pressing portion 14 is provided on the inner side (lower side in FIG. 11) of the positioning portion 13 in the radial direction of the rotor. Then, a part of the torque transmitting surface 16 for transmitting the braking torque to the support 1 at the end of the back plate 6 (the radial outer end of the rotor in the illustrated example) is arranged in the circumferential direction of the rotor (left in the illustrated example). ) Elastically. Further, the contact portion 15 is located inside the pressing portion 14 in the radial direction of the rotor, and a part of the torque receiving surface 17 that faces the torque transmitting surface 16 at a part of the support 1. Abut. The distal end of the extension 18 formed at the inner end in the radial direction of the rotor and connected to the contact portion 15 is elastically attached to the inner peripheral surface of the back plate 6 in the radial direction of the rotor. Contact.
[0007]
In the case of the pad clip 12a having the above-described structure, the positioning portion 13 elastically clamps the convex portion 10 and the distal end of the extending portion 18 is elastically attached to the inner peripheral surface of the back plate 6. The back plate 6 is prevented from rattling against the support 1 during non-braking. Further, since the pressing portion 14 presses the back plate 6 in the rotor circumferential direction, it is possible to prevent the torque transmitting surface 16 and the torque receiving surface 17 from violently colliding during braking.
[0008]
That is, there is a gap between the two surfaces 16 and 17 in order to enable the displacement of the back plate 6 with respect to the support 1. At the time of braking, due to the brake torque applied to the back plate 6 due to the friction between the side surface of the rotor and the lining 7 (see FIG. 1) attached to the back plate 6, the rotor exists on the anchor side (the front side in the rotation direction of the rotor). The two surfaces 16 and 17 are in contact with each other via a part of the pad clip 12a. In this state, the brake torque applied to the pad 5 is supported by the support 1. If the torque transmitting surface 16 and the torque receiving surface 17 vigorously collide with each other (via a part of the pad clip 12a) during braking in such a state, the hitting sound is generated. On the other hand, since the pressing portion 14 presses the back plate 6 in the circumferential direction of the rotor, the collision between the two surfaces 16, 17 becomes slow, and the generation of the hitting sound is suppressed.
[0009]
Further, although not shown, in Patent Document 1, a pressing portion is provided at a portion deviated from the torque transmitting surface and the torque receiving surface at the outer end portion in the radial direction of the rotor, and a back plate or a support is provided by the pressing portion. A structure for pressing the rotor in the outer circumferential direction is described. However, in the case of the invention described in Patent Document 1, no structure for pressing the back plate is provided between the torque transmitting surface and the torque receiving surface.
[0010]
[Patent Document 1]
JP-A-8-226473 [Patent Document 2]
JP-A-10-122278
[Problems to be solved by the invention]
In the case of the structure shown in FIG. 11, it is difficult to increase the force by which the pressing portion 14 presses the back plate 6 toward the center of the support 1. For this reason, when the braking torque applied to the back plate 6 at the time of braking becomes large, such as when braking is performed relatively steeply, it may not always be possible to sufficiently suppress the occurrence of a tapping sound. That is, in the case of the conventional structure shown in FIG. 11, the angle α between the pressing piece 22 having the pressing portion 14 and the contact portion 15 provided at both ends thereof, the torque transmitting surface 16 and the torque receiving surface 17 is: It was about 1 to 5 degrees in a free state. When the back plate 5 is pressed only by the pressing portion 14 in such a shape, the force cannot always be increased, and the effect of suppressing the occurrence of the hitting sound is uncertain. Such a problem similarly occurs in the case of the structure described in Patent Document 1. If the angle α is increased to about 6 to 10 degrees in a free state, the effect of preventing the hitting sound is improved, but the workability of attaching the pad 5 to the support 1 is deteriorated, At the time of release, the resistance when the pad 5 slides with respect to the support 1 becomes large, so that it is difficult to employ the pad.
In view of such circumstances, the present invention has been made in order to realize a disc brake pad clip that can sufficiently and stably obtain the effect of suppressing the occurrence of the hitting sound.
[0012]
[Means for Solving the Problems]
The disc brake pad clip of the present invention is provided between the end of the pad back plate in the rotor circumferential direction and the engaging portion of the support, similarly to the above-described conventional disc brake pad clip.
In particular, in the pad clip for a disc brake of the present invention, a substantially U-shaped positioning portion that follows the convex portion on the support side and a rotor radially inner side than the positioning portion, A pressing portion that presses a part of the torque transmitting surface that transmits the braking torque to the support in the rotor circumferential direction, and the support that is located on the inner side in the rotor radial direction of the pressing portion and faces the torque transmitting surface. And a contact portion that comes into contact with a part of the torque receiving surface.
Further, a second contact portion is provided at a portion deviating from the pressing portion, at least a part of the support, deviating from the torque receiving surface in the circumferential direction of the rotor at the time of braking.
[0013]
[Action]
The pad clip for a disc brake of the present invention configured as described above prevents the pad from rattling against the support during non-braking, and ensures that the torque transmitting surface and the torque receiving surface vigorously abut during braking. The effect of preventing the occurrence of the hitting sound due to the collision between the two surfaces is the same as that of the above-described conventional pad clip for a disc brake.
In particular, in the case of the pad clip for a disc brake of the present invention, the force pressing the back plate of the pad in the rotor circumferential direction is the sum of the elasticity of the pressing portion and the elasticity of the second contact portion. Accordingly, it is possible to sufficiently secure this force and sufficiently suppress occurrence of a tapping sound during braking. Further, since the pressing portion and the second contact portion are provided independently of each other, the force for pressing the back plate of the pad in the circumferential direction of the rotor by these pressing portions and the second contact portion is increased, Moreover, it can be stabilized. For this reason, the effect of suppressing the occurrence of the hitting sound is stabilized.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An example of an embodiment of the present invention will be described with reference to FIGS. The feature of the present invention is that, in the circumferential direction of the rotor, the shape of the pad clips 12, 12 provided between both ends of the back plate 6 of the pad 5 and both ends of the support 1 is devised so as to be generated during braking. The point is that the hammering sound is suppressed stably. In addition, since the entire structure of the disc brake to which the pad clips 12 and 12 are assembled is as described above, the overlapping description will be omitted or simplified, and the following description will focus on the features of the present invention.
[0015]
The pad clip 12 of this embodiment is made by bending a metal plate having elasticity and corrosion resistance, such as a stainless steel plate. In the case of this example, the pad clip 12 is connected to the element 19a on the outer side (at the end in the width direction of the vehicle body with respect to the axial direction of the rotor at the time of assembling to the vehicle, the front side in FIG. 1) and the inner side (also the vehicle body). The element 19b on the center side (the back side in FIG. 1) is connected by a connecting portion 20 to be integrally formed. The element 19a on the outer side and the element 19b on the inner side have basically the same structure, and the pair of pad clips 12 provided at both ends of the support 1 also has the same structure. Therefore, the structure of the element 19a on the outer side of the right pad clip 12 in FIG. 1 will be described below.
[0016]
The element 19a includes a positioning portion 13, a pressing portion 14b, and a contact portion 15b. Of these, the positioning portion 13 engages with the convex portion 10 formed on a part of the support 1 so as to protrude toward the back plate 6, thereby positioning the rotor in the radial direction. It is approximately U-shaped. That is, the positioning portion 13 is provided with elasticity in a direction in which the opening narrows in a free state. Further, with respect to the axial direction of the rotor, tongue pieces 21a and 21b (omitted in FIGS. 1 to 3) are provided at both end edges of the positioning portion 13 so as to be bent into the substantially U-shaped inner portions. Such a positioning portion 13 elastically clamps the convex portion 10 in a state of being attached to the support 1, and positions the pad clip 12 in the radial direction of the rotor. At the same time, the projection 10 is sandwiched between the tongue pieces 21a and 21b to position the pad clip 12 in the axial direction of the rotor.
[0017]
The pressing portion 14b is provided inside the positioning portion 13 in the radial direction of the rotor. In other words, the pressing piece 22 is extended from the radially inner end of the positioning portion 13 in a radially inwardly continuous state. The bending angle of the pressing piece 22 with respect to the inner end of the positioning portion 13 is less than 90 degrees. That is, as shown in FIG. 6, the angle θ between the radial inner end of the rotor of the positioning portion 13 and the pressing piece 22 in the free state is an obtuse angle (θ> 90 degrees). Therefore, in a state where the pad clip 12 is mounted on the disc brake, the pressing piece 22 is provided with the torque receiving surface 17 provided in the engaging groove 9 of the engaging portion 4 provided at both ends of the support 1 and the back plate. 6 with the torque transmission surface 16. Of the two end portions of the pressing piece 22, the pressing portion 14b at the outer end in the radial direction of the rotor is on the torque transmitting surface 16, and the contact portion 15b on the inner end is also on the torque receiving surface 17, Contact each other.
[0018]
That is, the pressing portion 14b is near the continuous portion with the positioning portion 13 at the outer end of the pressing piece 22, and the abutting portion 15b is at the inner end of the pressing piece 22 in the rotor radial direction described below. It is near the continuous portion with the pressing piece 23. The pressing portion 14b as described above elastically presses a part of the torque transmitting surface 16 in the rotor circumferential direction in a state where the pad clip 12 is mounted on the disc brake. In the illustrated example, a tongue piece 21c is also formed at an intermediate portion of the pressing piece 22, and the tongue piece 21c (omitted in FIGS. The positioning of the rotor in the axial direction is achieved. Further, the rotor radial pressing piece 23 extends from the inner end of the pressing piece 22 toward the center of the support 1. The tip of the rotor radial pressing piece 23 abuts on the inner peripheral surface of the back plate 6 with the pad clip 12 mounted on the disc brake. 6 prevents rattling.
[0019]
Further, in the case of the pad clip 12 of the present example, a second contact portion 24 is provided in a portion separated from the pressing portion 14b. The second abutting portion 24 presses a portion of the support 1 deviated from the torque receiving surface 17 at least at the time of braking in the circumferential direction of the rotor, so that the back plate 6 Provides circumferential elasticity. In the case of this example, the second contact portion 24 is a part of the metal plate constituting the pad clip 12, and a portion located outside the positioning portion 13 in the radial direction of the rotor is formed in an arc shape. This is a portion that extends beyond the curved portion 25 formed by bending.
[0020]
That is, the base end of the curved portion 25, which is curved from the upper end of the positioning portion 13 with respect to the radial direction in a part of the metal plate in a direction in which the radial outer side and the center side of the support 1 are convex, is continuous. Let me. Further, the tip of a portion linearly extending from the tip of the curved portion 25 is the second contact portion 24. The second abutting portion 24 abuts on the outer portion of the convex portion 10 as a part of the engaging portion 4 constituting the support 1 in a state where the pad clip 12 is mounted on the disc brake. When the pad clip 12 is mounted on the disc brake, the curved portion 25 may be elastically deformed so that the second contact portion 24 is elastically contacted with the engaging portion 4. For this reason, the second abutment portion 24 is moved along with the back plate 6 approaching the engagement portion 4 during braking (without elastically deforming the curved portion 25 during non-braking in the assembled state). In the case where the second contact portion 24 is simply brought into contact with the engagement portion 4, or from the beginning (at the time of non-braking in the assembled state, the curved portion 25 is elastically deformed and the second contact portion 24 is elastically deformed). When the contact portion 24 is elastically contacted with the engagement portion 4), the positioning portion 13 of the pad clip 12 is given elasticity in the rotor circumferential direction.
[0021]
The pad clip 12 of the present embodiment configured as described above functions to prevent the back plate 6 of the pad 5 from rattling with respect to the support 1 during non-braking, and the torque transmitting surface 16 and the torque receiving surface 17 form during braking. The effect of preventing the vigorous contact and suppressing the generation of a tapping sound due to the collision between the two surfaces 16, 17 is substantially the same as that of the above-described conventional disc brake pad clip.
[0022]
In particular, in the case of the pad clip 12 of the present example, the force of pressing the back plate 6 of the pad 5 in the rotor circumferential direction depends on the elasticity of the pressing portion 14b and the elasticity of the second contact portion 24. It will be the sum. This point will be described with reference to FIG. In the case of the conventional structure shown in FIG. 11 described above, since the back plate 6 is pressed only by the elasticity of the pressing portion 14, the force pressing the back plate 6 in the rotor circumferential direction against the braking torque during braking is 7 and not so large. On the other hand, in the case of the pad clip 12 of the present example, the force for pressing the back plate 6 in the circumferential direction of the rotor is the sum of the elasticity of the pressing portion 14b and the elasticity of the second contact portion 24. It becomes like a broken line b or a chain line c in FIG. Among these, the broken line b indicates the case where the second contact portion 24 is simply brought into contact with the engagement portion 4 without elastically deforming the curved portion 25 during non-braking in the assembled state. The chain line c indicates the case where the curved portion 25 is elastically deformed and the second contact portion 24 is elastically contacted with the engaging portion 4 from the beginning when the braking is not performed in the assembled state. Each is shown. As is apparent from FIG. 7, in the case of the pad clip 12 of this example, the effect of suppressing the hitting sound generated during braking by increasing the force pressing the back plate 6 of the pad 5 in the circumferential direction of the rotor. Can be increased.
[0023]
Further, in the case of the pad clip 12 of this example, unlike the case of the conventional structure shown in FIG. 11 described above, the pressing portion 14b and the second contact portion 24 sandwich the positioning portion 13 therebetween. And are provided independently of each other. Therefore, the force for pressing the back plate 6 of the pad 5 in the circumferential direction of the rotor by the pressing portion 14b and the second contact portion 24 can be increased and stabilized. For this reason, the effect of suppressing the occurrence of the hitting sound is stabilized.
[0024]
Next, FIG. 8 shows a second example of the embodiment of the present invention. In the case of this example, the second contact portion 24a is a part of the metal plate constituting the pad clip 12c, and a portion located outside the positioning portion 13 in the radial direction of the rotor is bent into an arc shape. It is an intermediate portion of the formed curved portion 25a.
That is, a part of the metal plate is curved from the upper end of the positioning portion 13 in the radial direction to a direction in which the radially inner side and the end side of the support 1 are convex, and the base end of the curved portion 25a is bent. It is continuous. An intermediate portion of the curved portion 25a is the second contact portion 24a, and the second contact portion 24a is brought into contact with the engaging portion 4 provided at an end of the support 1. The configuration and operation of the other parts are the same as in the case of the first example described above.
[0025]
Next, FIG. 9 shows a third example of the embodiment of the present invention. In the case of this example, the curved portion 25 b is formed in a direction protruding from the outer surface of the engaging portion 4 provided at the end of the support 1. The distal end of a portion formed in a linearly continuous state from the distal end of the curved portion 25b is brought into contact with the engaging portion 4 as a second contact portion 24b. The configuration and operation of the other parts are the same as in the case of the first example described above.
[0026]
Next, FIG. 10 shows a fourth example of the embodiment of the present invention. In the case of this example, the second pressing portion 26 is provided on the inner side in the rotor radial direction with respect to the second contact portion 24c. Is provided. The second pressing portion 26 presses a part of the end face of the back plate 6 of the pad 5 which is located on the outer side in the rotor radial direction of the positioning portion 13 in the rotor circumferential direction. The configuration and operation of the other parts are the same as in the case of the first example described above.
[0027]
【The invention's effect】
Since the pad clip for a disc brake of the present invention is configured and operates as described above, the force for pressing the back plate of the pad in the rotor circumferential direction can be stably increased. For this reason, the tapping sound generated during braking can be suppressed stably.
[Brief description of the drawings]
FIG. 1 is a front view of a disc brake incorporating a pad clip according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 is an enlarged perspective view of a portion A in FIG. 1 showing a support and a pad clip taken out therefrom.
FIG. 4 is a view of the right pad clip of FIG. 1 as viewed from the left side of FIG.
FIG. 5 is a view as seen from above in FIG. 4;
FIG. 6 is a view also seen from the right side.
FIG. 7 is a diagram for explaining the magnitude of the force with which the pad clip presses the back plate of the pad.
FIG. 8 is a view similar to FIG. 2, showing a second example of the embodiment of the present invention.
FIG. 9 is a view similar to FIG. 3, showing a third example.
FIG. 10 is a view similar to FIG. 2, showing a fourth example.
FIG. 11 is a view similar to FIG. 2, showing an example of a conventional structure.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 support 2 mounting hole 3 caliper 4 engaging portion 5 pad 6 back plate 7 lining 8 engaging protrusion 9 engaging groove 10 convex portion 11 caliper claw 12, 12a, 12b, 12c pad clip 13 positioning portion 14, 14a, 14b Pressing portions 15, 15a, 15b Contact portion 16 Torque transmitting surface 17 Torque receiving surface 18 Extension portions 19a, 19b Element 20 Connecting portions 21a, 21b, 21c Tongue piece 22 Pressing piece 23 Rotor radial pressing pieces 24, 24a, 24b Second contact portion 25, 25a, 25b Curved portion 26 Second pressing portion

Claims (3)

In a disk brake pad clip provided between a rotor circumferential end of a pad back plate and an engaging portion of a support, a substantially U-shaped positioning portion that follows the convex portion on the support side, and the positioning portion A pressing portion that is provided radially inward of the rotor and that presses a part of the torque transmitting surface that transmits the braking torque to the support at the end of the back plate in the circumferential direction of the rotor; An abutting portion that is present on the inner portion and faces the torque transmitting surface and abuts on a portion of the torque receiving surface of the support; A pad clip for a disc brake, characterized in that a second contact portion is provided for pressing a portion of the portion deviating from the torque receiving surface in the circumferential direction of the rotor. The said 2nd contact part is a curved part which formed the part located in the rotor radial direction outer side than the said positioning part in an arc shape, or the part extended from this curved part. Pad clip for disc brake. A second pressing, which is located on the inner side in the rotor radial direction with respect to the second contact portion and presses a part of the back plate end face located on the outer side in the rotor radial direction of the positioning portion in the rotor circumferential direction. The pad clip for a disc brake according to claim 1, having a portion.

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