JPH0669459U - Disc brake - Google Patents

Abstract

(57) [Summary] [Structure] The pad guides 8 provided so as to face each other with the carrier are engaged with the pad guides 8 while slidingly contacting each other at the engaging portions 33 at the end portions thereof so that a disc axis line is formed between the pad guides 8. A pair of pads 4 slidably supported in the direction, and the engaging portion 33 of the pad 4 is provided at the end of the surface on the engagement side with the pad guide 8 over the entire area. A chamfer 34 is formed. [Effect] When the pad 4 is engaged with the pad guide 8 while the engaging portion 33 is in sliding contact, the engaging portion 33 is guided by the chamfer 34 and easily engages, so that the sliding contact area is reduced. Even if it is large or the gap between the pad guide 8 and the pad 4 is narrowed to prevent abnormal noise, good assembling performance can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake used for braking a vehicle or the like.

[0002]

[Prior art]

 The disc brake includes a carrier provided in a non-rotating portion of the vehicle, a pad guide provided so as to face the carrier, and a pad guide slidably engaged with the pad guide at an end engaging portion thereof. A pair of pads slidably supported along the disc axial direction between the guides, and a pair of pads slidably supported by the carrier, sandwiching the pair of pads from the back side of each pad and contacting the disc with both pads interposed. Some have calipers.

[0003]

[Problems to be solved by the device]

 The disc brake has a structure in which the engaging portion of the pad is inserted into the pad guide, and when the sliding contact area between the engaging portion and the pad guide is large, or the gap between the pad guide and the pad is a measure for abnormal noise, etc. Therefore, there is a problem that the assembling ability when engaging the engaging portion of the pad with the pad guide deteriorates when the pad is narrow.

Therefore, an object of the present invention is to provide a pad even when the sliding contact area between the pad and the pad guide is large, or when the gap between the pad guide and the pad is narrow to prevent abnormal noise. An object of the present invention is to provide a disc brake that can obtain a good assembling property when engaging the engaging portion of the pad with the guide.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the disc brake of the present invention comprises a carrier provided in a non-rotating portion of a vehicle, a pad guide provided so as to face the carrier, and an engaging portion at an end portion of the pad guide. A pair of pads that are slidably engaged with each other and slidably supported between the pad guides along the disc axial direction, and a pair of pads slidably supported by the carrier, and the pair of pads are respectively attached to the rear surface side. And a caliper that holds the pads from both sides and makes contact with the disc that interposes both pads.The engagement portion of the pad is chamfered over the entire area at the end of the surface on the engagement direction side with the pad guide. Is formed.

[0006]

[Action]

 According to the disc brake of the present invention, since the chamfer is formed on the engaging portion of the pad at the end portion of the surface on the side of engagement with the pad guide, the engaging portion is slidably contacted. When engaging with the pad guide, the chamfer guides the engaging portion to easily engage with the pad guide.

[0007]

【Example】

 A disc brake according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 and FIG. 2 show the overall structure of a disc brake of the present embodiment. This disc brake has a carrier 2 fixed to a non-rotating portion of a vehicle and a disc between the carrier 2 and the carrier 2. A pair of pads 4 arranged in a state of interposing 3 and two pins 6 on both ends of a slide guide portion 5 of the carrier 2 are fitted so as to be slidable in the axial direction of the disc 3. It mainly consists of the caliper 7 and the caliper 7. Here, both pads 4 are slidable at both ends in a direction along the axis of the disk 3 by a pair of pad guides 8 provided inside the sliding guide portion 5 of the carrier 2 so as to face each other. A return spring 9 is supported between the pads 4 and biases the pads 4 so that they are separated from each other by a predetermined distance.

The caliper 7 includes a claw portion 10 (reaction portion) arranged on one side of the pad 4 on the opposite side of the disc 3 and a caliper 7 arranged on the other side of the pad 4 on the opposite side of the disc 3. It has a binder portion 11 and a bridge portion 12 which connects the claw portion 10 and the cylinder portion 11 on the outer side in the radial direction of the disc. This disc brake is generated by depressing a brake pedal (not shown). When the brake fluid pressure is applied, a piston (not shown) that is slidably fitted in the cylinder portion 11 of the caliper 7 along the disc axial direction projects toward the pawl portion 10 to cause the piston and the pawl to move. The pad 10 is held between the portion 10 and the disk 3 via the disk 3 from the back surface (the surface opposite to the disk 3) and these are pressed so as to slide in the disk 3 direction. As a result, the pads 4 and the disk 3 are brought into contact with each other to generate friction therebetween, thereby weakening the rotation of the wheels and braking the vehicle.

The pad 4 is composed of a friction material 13 that comes into contact with the disk 3 to generate a frictional force, and a back metal 14 to which the friction material 13 is fixed on one side. As shown in the figure, the backing metal 14 has a base plate portion 15 to which the friction material 13 is fixed, and a disk peripheral portion having the same thickness in the disk axis direction (vertical direction in FIG. 4) at both ends of the base plate portion 15. Direction (left and right direction in FIG. 3) and a substantially rectangular sliding support portion 16 provided so as to project outward. Here, the sliding support portion 16 is provided between an upper flat surface portion 17 and a lower flat surface portion 18 which are formed at an end portion of the substrate portion 15 in the disc circumferential direction substantially orthogonal to the disc circumferential direction. Further, it has a side surface portion 19 on the protruding tip side that is substantially orthogonal to the disk circumferential direction, and an upper surface portion 20 and a lower surface portion 21 that are orthogonal to the side surface portion 19.

Here, the friction material 13 has inclined surfaces 23 that are inclined at an obtuse angle with the braking surface 22 that contacts the disk 3 at both ends in the disk circumferential direction. As a result, the end portion of the friction material 13 does not cause stick-slip with the disc 3 that triggers the brake squeal. In addition, in the present embodiment, the slit portions 24, which are formed substantially in the center of the disc circumferential direction in the plane direction orthogonal to the disc circumferential direction, are inclined so as to form an obtuse angle with respect to the braking surface 22, respectively. It has a substantially V-shaped cross section having two inclined surfaces 25. With the slit portion 24 having such a shape, in the conventional slit portion having the planes perpendicular to the braking surface, stick slip with the disc 3 may occur in the slit portion, or friction may occur. The abrasion powder of the material was sometimes clogged, which could cause abnormal noise, but these problems can be eliminated.

It should be noted that the slit portion 24 of the pad 4 arranged on the cylinder portion 11 side, that is, the inner side has a small angle with respect to the braking surface 22 of the inclined surface 25 on the inlet side of the disc rotation direction, and is inclined on the outlet side of the disc rotation direction. By increasing the angle of the surface 25 with respect to the braking surface 22 to increase the area of the braking surface 22 on the inlet side in the disk rotation direction via the slit 24 and decrease the area of the braking surface 22 on the disk rotation outlet side, The effect of preventing uneven wear and abnormal noise can be enhanced. Further, the slit portion 24 is not provided at the center position in the disc circumferential direction, but the slit portion 24 of the pad 4 arranged on the claw portion 10 side, that is, the outer side, is arranged on the disc rotation direction inlet side and on the inner side. The slit portion 24 of No. 4 may be offset to the outlet side in the disc rotation direction. Further, when a twin-bore caliper having two pistons is adopted, the braking surface 22 side of the slit portion 24 is positioned inside the range of the pad 4 pressed by one piston (piston axis side). Good.

The carrier 2 is spaced apart from each other by a predetermined distance and extends in the disc axial direction, and a guide hole 26 into which the pin 6 of the caliper 7 is slidably fitted is extended inside. The sliding guide portion 5 is provided along the above. An engaging groove 27 having a substantially rectangular shape and recessed is formed at a predetermined position inside the sliding guide portions 5.

The pad guide 8 that slidably supports the pad 4 is provided on the pad 4 side of the slide guide portion 5 of the carrier 2. The pad guide 8 has a bent portion 28 which is substantially similar to the engaging groove 27 of the carrier 2 and is fitted into the engaging groove 27, and the bent portions 28 are provided on both sides of the bent portion 28. An upper plate portion 29 and a lower plate portion 30 which are parallel to the bottom surface 28a of the spring plate are provided, and the lower plate portion 30 is provided with a spring plate portion 31 extending substantially perpendicularly from the opposite side to the bent portion 28. It is provided. Further, the upper plate portion 29 side and the lower plate portion 30 side of the bent portion 28 and the lower plate portion 30 are provided with the upper surface portion 20 and the lower surface portion 21 of the sliding support portion 16 of the pad 4 and the lower flat surface portion 18. While slidingly contacting each other, they are moved substantially along the disc axial direction and engaged with each other. Then, the pad 4 is biased toward the bridge portion 12 by the biasing force of the spring plate portion 31 of the pad guide 8. A guide plate portion 32 for facilitating the engagement of the pad 4 is formed on the upper plate portion 29 side and the lower plate portion 30 side of the bent portion 28 and the lower plate portion 30, respectively. The guide plate portion 32 is inclined so that the protruding tip side is located outside the pad engaging position. Further, as shown in FIGS. 3 to 6, in the present embodiment, the engaging portion 33 of the pad 4 that is engaged with the pad guide 8 while slidingly contacts is the upper surface portion 20 and the lower surface of the slide support portion 16. It is composed of a portion 21 and a lower flat surface portion 18 of the substrate portion 15.

In the present embodiment, the friction material of each of the upper flat surface portion 17, the lower flat surface portion 18 of the base plate portion 15 and the side surface portion 19, the upper surface portion 20, and the lower surface portion 21 of the slide supporting portion 16 is provided. A chamfer 34 is continuously formed on the 13 side so as to be inclined at about 45 ° with respect to these.

According to the disc brake having such a structure, the pad 4 is slidably contacted with the pad guide 8 with the friction material 13 side being the leading side as shown by the arrow in FIG. At this time, the guide plate portion 32 for guiding the pad 4 is provided in the pad guide 8, and in addition to this, the engaging portion 33 of the pad 4 is engaged with the pad guide 8. Since the chamfer 34 is formed on the mating direction side, that is, on the friction material 13 side, the chamfer 34 further guides the engaging portion 33 to easily engage the pad guide 8. Therefore, as described above, since the engaging portion 33 of the pad 4 is inserted into the pad guide 8, the sliding contact area between the engaging portion 33 and the pad guide 8 is large, and the pad guide 8 and the pad 4 are Good assembling performance can be obtained even when the gap is narrowed to prevent abnormal noise. Since the chamfer 34 can be provided at the same time when the backing metal 14 is press-molded, there is no cost increase and the performance of the disc brake is not deteriorated.

[0017]

[Effect of device]

 As described above in detail, according to the disc brake of the present invention, the engaging portion of the pad is chamfered over the entire area at the end of the surface on the side of the engagement with the pad guide. When the mating portion is slidably contacted with and engaged with the pad guide, the chamfer guides the engaging portion to easily engage with the pad guide. Therefore, since the pad engaging part is inserted in the pad guide, the sliding contact area between the engaging part and the pad guide is large, or the gap between the pad guide and the pad is narrowed to prevent noise. Even in the case where it is attached, good assembling property can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing the overall structure of a disc brake according to an embodiment of the present invention.

FIG. 2 is a front view showing the overall structure of a disc brake according to an embodiment of the present invention.

FIG. 3 is a front view showing a pad of a disc brake according to an embodiment of the present invention.

FIG. 4 is a view showing a pad of a disc brake according to an embodiment of the present invention as viewed from the direction A in FIG.

FIG. 5 is a view showing a pad of a disc brake according to an embodiment of the present invention, as viewed from the direction B in FIG.

FIG. 6 is a view showing a pad of a disc brake according to an embodiment of the present invention as viewed from the direction C in FIG.

FIG. 7 is a cross-sectional view taken along the line YY in FIG. 2 schematically showing a state before the pad of the disc brake according to the embodiment of the present invention is engaged with the pad guide.

[Explanation of symbols]

 2 carrier 3 disk 4 pad 7 caliper 8 pad guide 33 engaging portion 34 chamfer

Claims (1)

[Scope of utility model registration request] 1. A carrier provided in a non-rotating portion of a vehicle, a pad guide provided so as to face each other to the carrier, and the pad guide slidably engaged with the pad guide at an end engaging portion of the pad. A pair of pads slidably supported in the disc axial direction between the guides, and a pair of pads slidably supported by the carrier, sandwiching the pair of pads from their respective back sides to interpose both pads on the disc. In a disc brake having a caliper to be brought into contact, a chamfer is formed over an entire area of an end portion of a surface of an engagement portion of the pad on an engagement direction side of the pad guide. brake.