JP2008144914A - Wear alarm device of disk brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wear alarm device of a disk brake device which emits alarm sound making it easy to judge abnormal sound such as creak of the brake. <P>SOLUTION: The wear alarm device 50 of the disk brake device 100 which alarms limiting amount of abrasion of a pair of friction pads 6 holding a disk 1 rotating along with wheels includes an elastic member 24 extended from the friction pad 6 toward the disk 1, a spherical body 21 provided on the end of disk side of the elastic member 24 and disposed on friction pad side by the limiting amount of abrasion and protuberances 23a, 41 obtained by projecting the spherical body 21 in the direction of the rotating axis of the disk 1 and formed in the region concentric with the rotating axis. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wear warning device for a disc brake device, and more particularly to a wear warning device for a disc brake device that informs a driver of wear of a friction pad by sound.

  In a disc brake that obtains braking force by pressing the disc with a pair of pads arranged on both sides of the disc, wear of the lining material constituting the pad is inevitable, but when the lining material is completely worn, the braking force is reduced Since there is a fear, it is preferable to replace the pad when it is worn to a predetermined degree. Therefore, there is known a wear warning device for a disc brake device to which a sensor plate is attached that emits an abnormal sound to inform the driver when the wear of the lining material reaches a predetermined amount (see, for example, Patent Document 1).

FIG. 1 is a side view of a wear warning device for a disc brake device described in Patent Document 1. FIG. In this wear alarm device, a dowel 131 is provided on the back side of the side edge of the back plate 124, and the sensor plate 132 is fixed to a U-shaped fixing portion 133 that can be inserted into the side edge of the back plate 124. The spring part 134 is formed by turning the back side of the back plate 124 from the part 133 and the vibration part 135 is linearly extended from the spring part 134 toward the disk. The fixing portion 133 sets an interval between the two facing pieces 133a and 133b to be smaller than the thickness of the back plate 124 including the dowel 131, and has an engagement hole 137 for fitting the dowel 131 to the facing piece 133a. A bent piece portion that stands up toward the other opposed piece 133b of the fixed portion 133 on both sides of the one opposed piece 133a with the joint hole 137 interposed therebetween, and sandwiches the back plate 124 in cooperation with the other opposed piece 133b. 138 is provided. With this structure, when the fixing portion 133 of the sensor plate 132 is inserted into the side edge portion of the back plate 124 of the friction pad 125, the bent piece portion 138 provided on the one opposing piece 133a can easily get over the dowel 131. The dowel 131 can be fitted into the engagement hole 137.
Japanese Patent Publication No. 2873773

  However, when the friction pad 125 is worn, the sensor plate 132 such as the wear warning device described in Patent Document 1 makes an abnormal noise due to the vibration part 135 coming into contact with the disk. There is a problem that it is difficult to distinguish from other abnormal sounds. Moreover, the magnitude of the abnormal noise only depends on the wheel cylinder pressure, and it was difficult for the manufacturer to adjust the magnitude of the abnormal noise.

  In view of the above problems, an object of the present invention is to provide a wear alarm device for a disc brake that emits an alarm sound that can be easily distinguished from abnormal sounds such as brake noise.

  In view of the above problems, the present invention is a wear warning device for a disc brake device that warns the wear limit of a pair of friction pads that sandwich a disc that rotates with a wheel, and extends from the friction pad toward the disc. An elastic member, a sphere provided at the end of the elastic member on the disk side, arranged on the friction pad side by the wear limit amount, and a region concentric with the rotation axis obtained by projecting the sphere in the direction of the rotation axis of the disk And formed convex portions (for example, convex portions 23a and 41).

  According to the present invention, when the friction pad wears a wear limit amount, the sphere and the convex part come to interfere with each other, and a hitting sound is generated in which the sphere hits the convex part. Therefore, the driver can easily determine that the friction pad is worn. In addition, by changing the size of the sphere, the loudness and tone color can be adjusted.

  For example, the convex portion may be formed by one or more protrusions (for example, the convex portion 41) projecting in the outer circumferential direction on the outer edge of the disc, or in the concave and convex grooves formed in the region of the disc. One or more convex parts (for example, convex part 23a) may be sufficient.

  The present invention also relates to a wear alarm device for a disc brake device that warns the wear limit of a pair of friction pads that pinch a disc provided with fins that rotate together with wheels. An elastic member extending toward the disk, a sphere which is an end of the elastic member on the disk side, is radially outward from the outer edge of the disk, and is connected to the friction pad side by a wear limit amount from the fin, and an elastic member A spring that biases the disk in the radial direction of the disk, and a clasp that supports the biasing of the spring by having a convex portion on the rotating surface of the disk substantially at the same position as the wear limit amount. .

  According to the present invention, when the friction pad is worn by a wear limit amount, the stopper comes into contact with the disk and is disengaged by its sliding force, so that the sphere interferes with the fin by the biasing force of the spring. Therefore, a hitting sound is generated when the sphere hits the fin, and the hitting sound does not become a continuous sound such as a brake squeal. Therefore, the driver can easily determine that the friction pad is worn. In addition, by changing the size of the sphere, the loudness and tone color can be adjusted.

  It is possible to provide a wear alarm device for a disc brake that emits an alarm sound that can be easily distinguished from abnormal sounds such as brake noise.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

First, the disc brake device 100 will be briefly described with reference to FIGS. 2A and 2B exemplify the disc brake device 100 operated by hydraulic pressure, the disc brake device 100 may be in any form such as one operated by a motor.

  The carrier 15 is fixed to a non-rotating portion of the vehicle body, and has a main body portion 11 having a connection hole on the in-side, a pair of bridge portions 5 extending from the main body portion 11 across the disc 1, and the bridge portions 5 to the disc 1. And a leg 2 extending inwardly in the radius thereof. The carrier 5 supports a caliper 3 slidable in parallel with the rotation axis of the disk 1 by carrier pins 4. The caliper 3 includes a cylinder portion 12 in which the piston 8 is slidably mounted, a bridge portion 13 extending from the cylinder portion 12 across the disc 1, and a radius inward along the disc 1 from the bridge portion 13. And a pair of claw portions 9 extended to the sides.

  A friction pad (inner pad) 6 is mounted on the same surface of the inner peripheral side of the main body 11, and a friction pad (outer pad) 6 is mounted on the protruding portion 10 on the same inner surface of the leg 2. ing. The pair of friction pads 6 has a lining material 6 b bonded to a back metal 6 a, and the lining material 6 b is disposed to face the disc 1. The pair of friction pads 6 is configured to maintain a state parallel to the disk 1 by an urging force such as a leaf spring fixed to the bridge portion 5 of the carrier 15.

  When hydraulic pressure is applied to the oil chamber in the cylinder portion 12 of the caliper 3, the piston 8 moves forward and presses the inner friction pad 6 against one surface of the disk 1, and the reaction causes the caliper 3 to be guided to the carrier pin 4. Moving in the opposite direction to the piston 8, the outer friction pad 6 is pressed against the other surface of the disk 1. The rotational resistance of the disk 1 is supported by a carrier 15 fixed to the vehicle body, thereby generating a braking torque.

  The wear alarm device 50 of the disc brake device 100 according to the present embodiment includes a sphere 21 extending from the friction pad 6 and has a concave and convex groove 23 formed in the disc 1. With this structure, when the friction pad 6 is worn more than a predetermined amount (hereinafter referred to as a wear limit amount), they interfere with each other and generate a striking sound.

  FIG. 3 shows a configuration diagram of the wear alarm device 50. 3A is a sectional view of the outer friction pad 6 and the disk 1, and FIG. 3B is a front view of the disk 1 when FIG. 3A is viewed from the outside (X direction). One end of the mounting portion 20 is fixed to the lower end of the back metal 6a, and an elastic member 24 extends substantially perpendicular to the disk 1 at the other end, and the free end of the elastic member 24 has a sphere 21 at the tip. The disc 1 has a shaft hole 16 for passing the axle and a screw hole 17 for attaching the disc 1 to a wheel or axle, and a central portion has a cylindrical recess 22 for installing a drum brake inside.

  The concave / convex groove 23 formed concentrically in the concave portion 22 is formed with concave / convex portions having convex portions 23a arranged at equal intervals in the concave portion 23b. The concave / convex groove 23 in FIG. 3 (b) has four convex portions 23a per circumference, but this number may be one or more, and the intervals between the convex portions 23a may not be equal. The region where the concave and convex grooves 23 are formed is a concentric region obtained by rotating the disk 1 when the sphere 21 is projected in the direction of the rotation axis of the disk 1.

  Before the friction pad 6 is worn, the sphere 21 is closer to the back metal 6a than the surface of the lining material 6b by a wear limit amount. Therefore, when the lining material 6b is worn by the wear limit amount, the sphere 21 comes to be positioned closer to the disk 1 than the surface of the lining material 6b. And the convex part 23a interfere.

  Since the elastic member 24 is, for example, an elastic body such as a spring or rubber, or a rod-like arm having an elastic body in part, the elastic member 24 repeats elastic deformation when the sphere 21 comes into contact with the convex portion 23a. Therefore, when the disk 1 rotates, a hitting sound is generated in which the sphere 21 hits the convex part 23a according to the rotational speed of the disk 1 and the number of convex parts 23a.

  Since the sphere 21 is made of a metal such as stainless steel or plated, the hitting sound between the sphere 21 and the disk 1 (metal) is a metal sound that can be easily discriminated from brake noise or road noise. Further, since the hitting sound is generated only when the spherical body 21 hits the convex portion 23a, the driver can easily determine that the hitting sound is not a continuous sound like a brake squeal but is an alarm sound due to wear of the friction pad 6. be able to.

  Further, the size of the hitting sound can be adjusted by, for example, the size and mass of the sphere 21 and the size of the convex portion 23a, and the timbre (frequency) depends on, for example, the material and size of the sphere 21 and the length of the elastic member 24. Since it can be adjusted, it can be adjusted to a tone color that is easy to distinguish from brake noise and road noise. Further, since the disk 1 is often cast, if the concave and convex grooves 23 are formed in advance, the manufacturing process of the disk 1 as shown in FIG.

  In FIG. 3, the sphere 21 is provided outside the disk 1, but it may be provided inside the disk 1, or may be provided both outside and inside.

  Next, another embodiment of the wear warning device 50 that generates a discontinuous warning sound will be described. FIG. 4 shows a configuration diagram of the wear alarm device 50. In FIG. 4, the same parts as those in FIG. 2A are denoted by the same reference numerals, and the description thereof is omitted.

  The attachment portion 20 is fixed to the upper end of the backing metal 6a, and an arm 32 is connected to the end portion on the outer peripheral side of the attachment portion 20 so as to be rotatable in the rotation axis direction of the disc 1 and in the inner diameter direction of the disc 1 by a pin 31. Has been. An elastic member 33 is extended at the end of the arm 32 opposite to the pin 31, and the sphere 21 is disposed at the end of the elastic member 33. When the sphere 21 is projected in the direction of the rotation axis of the disk 1, the position of the sphere 21 is located radially outward from the outer edge of the disk 1. The entire arm 32 may be constituted by the elastic member 33.

  A spring 35 that applies tension to the pin 34 provided at the inner peripheral end of the mounting portion 20 and the pin 38 provided at a predetermined portion of the arm 32 is hooked, and a stopper 37 that supports the tension is lined. 6b and the arm 32. The stopper plate 37 has a protruding portion 37a on the rotation surface of the disk 1 (inner peripheral side than the outer edge), and the position of the stopper plate 37 is such that the protruding portion 37a is positioned on the friction pad 6 side by the wear limit amount. Is set.

  The disk 1 has a so-called ventilated disk structure, and has a structure in which two flat plates are joined in parallel via a plurality of radiating fins 36. Accordingly, fins 36 are formed at substantially equal intervals in the space formed between the joining surfaces on the outer edge of the disk 1.

  In a state before the friction pad 6 is worn, the sphere 21 is positioned on the back metal 6a side by the wear limit amount from the approximate center of the fin 36.

  In the wear warning device 50 having such a structure, when the friction pad 6 wears a wear limit amount, the sliding surface of the disk 1 touches the convex portion 37a of the stopper 37, and the stopper 37 tilts toward the disk 1 side. The stopper 37 is disengaged in the rotation direction of the disk 1 due to the sliding resistance. When the stopper plate 37 is released, the arm 32 rotates in the inner diameter direction of the disk 1 with the pin 31 as an axis by the tension of the spring 35 and the sphere 21 moves downward, so that the sphere 21 is formed in the space formed between the joining surfaces of the disk 1. A part of the air and the fin 36 are interfered with.

  Since the arm 32 includes an elastic member 33 such as a spring or rubber, for example, when the sphere 21 contacts the fin 36, the elastic member 33 repeats elastic deformation. Therefore, when the disk 1 rotates, a striking sound in which the sphere 21 strikes the fins 36 is generated according to the rotational speed of the disk 1 and the number of fins 36. The hitting sound continues according to the rotation of the disk 1 even when the braking is released.

  Since the sphere 21 is made of a metal such as stainless steel or plated, for example, the hitting sound between the sphere 21 and the fin 36 (metal) is a metal sound that can be easily discriminated from brake noise or road noise. Further, since the hitting sound is generated only when the sphere 21 hits the fin 36, the driver can easily determine that the hitting sound is not a continuous sound like a brake squeal but is an alarm sound due to wear of the friction pad 6. Can do.

  Further, the magnitude and tone color of the hitting sound can be adjusted according to, for example, the size, mass, and material of the sphere 21, so that it can be adjusted to a tone color that can be easily discriminated from brake noise and road noise. Further, since the disk 1 having the fins 36 is used in the present embodiment, it is not necessary to provide the uneven groove 23 on the disk 1 as in the first embodiment.

  In FIG. 4, the sphere 21 is provided on the outer side of the disc 1, but it may be provided on the inner side of the disc 1 or on both the outer side and the inner side.

  Next, another embodiment of the wear warning device 50 that generates a discontinuous warning sound will be described. 5A and 5B are diagrams showing a configuration of the wear alarm device 50, in which FIG. 5A is a sectional view of the outer friction pad 6 and the disk 1, and FIG. 5B is an outer view of FIG. 5A. The front view of the disk 1 seen from (X direction) is shown. 5 that are the same as those in FIG. 2 are assigned the same reference numerals, and descriptions thereof are omitted.

  One end of the mounting portion 20 is fixed to the upper end of the back metal 6a, and an elastic member 24 extends substantially perpendicular to the disk 1 at the other end, and the free end of the elastic member 24 has a sphere 21 at the tip.

  On the outer edge of the disk 1, convex portions 41 that are convex in the outer circumferential direction are formed at equal intervals. In FIG. 5 (b), four protrusions 41 are provided per circumference, but this number may be one or more, and the intervals between the protrusions 41 may not be equal. The area where the convex portions 41 are formed is a concentric area obtained by rotating the disk 1 when the sphere 21 is projected in the direction of the rotation axis of the disk 1.

  Before the friction pad 6 is worn, the sphere 21 is positioned closer to the back metal 6a than the surface of the lining material 6b. Therefore, when the lining material 6b is worn by the wear limit amount, the sphere 21 comes to be positioned closer to the disk 1 than the surface of the lining material 6b. And the convex part 41 interfere.

  Since the elastic member 24 is, for example, an elastic body such as a spring or rubber, or a rod-like arm having an elastic body in part, the elastic member 24 repeats elastic deformation when the sphere 21 comes into contact with the convex portion 41. Therefore, when the disk 1 rotates, a striking sound that causes the sphere 21 to strike the convex portion 41 is generated according to the rotational speed of the disk 1 and the number of convex portions 41.

  Since the sphere 21 is made of a metal such as stainless steel or plated, the striking sound between the sphere 21 and the disk 1 (metal) is a metal sound that can be easily discriminated from brake noise or road noise. Further, since the hitting sound is generated only when the sphere 21 hits the convex portion 41, the driver can easily determine that the hitting sound is not a continuous sound like a brake squeal but an alarm sound due to wear of the friction pad 6. be able to.

  Further, the size of the hitting sound can be adjusted by, for example, the size and mass of the sphere 21 and the size of the convex portion 41, and the timbre (frequency) can be adjusted by, for example, the material and size of the sphere 21 and the length of the elastic member 24. Since it can be adjusted, it can be adjusted to a tone color that is easy to distinguish from brake noise and road noise. In addition, since the disk 1 is often cast, if the protrusions 41 are formed in advance, the manufacturing process of the disk 1 as shown in FIG.

  In FIG. 5, the sphere 21 is provided on the outer side of the disc 1, but it may be provided on the inner side of the disc 1 or on both the outer side and the inner side.

  As described above, the wear alarm device 50 of the present embodiment can emit an alarm sound that can be easily distinguished from abnormal sounds such as brake noise.

1 is a side view of a wear alarm device for a (conventional) disc brake device described in Patent Document 1. FIG. It is the front view and sectional drawing of a disc brake device. It is a block diagram of a wear warning apparatus (Example 1). (Example 2) which is a block diagram of a wear warning apparatus. (Example 3) which is a block diagram of a wear warning apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc 3 Caliper 6 Friction pad 6a Back metal 6b Lining material 20 Mounting part 21 Sphere 23 Uneven groove 23a, 37a, 41 Convex part
23b Recessed parts 24, 33 Elastic member 32 Arm 35 Spring 36 Fin 37 Clasp 50 Wear warning device 100 Disc brake device

Claims (4)

In a wear warning device for a disc brake device that warns the wear limit amount of a pair of friction pads holding a disc rotating with a wheel,
An elastic member extending from the friction pad toward the disk, a sphere disposed on the disk side of the elastic member, and disposed on the friction pad side by the wear limit amount; and the sphere A convex portion formed in a region concentric with the rotation axis obtained by projecting in the direction of the rotation axis of the disk;
A wear alarm device for a disc brake device, comprising:   2. The wear warning device for a disc brake device according to claim 1, wherein the convex portion is formed by one or more protrusions protruding in an outer peripheral direction on an outer edge of the disc. The convex portion is one or more convex portions in an uneven groove formed in the region of the disc.
The wear warning device for a disc brake device according to claim 1. In a wear alarm device for a disc brake device that warns the wear limit amount of a pair of friction pads holding a disc provided with fins that rotate with wheels,
An elastic member extending toward the disk so as to be able to rotate from the friction pad; and an end portion of the elastic member on the disk side that is radially outward from the outer edge of the disk and more worn than the fins. A sphere connected to the friction pad side by a limit amount, a spring that urges the elastic member in the radial direction of the disc, and a convex portion that is convex on the rotating surface of the disc are positioned substantially at the same position as the wear limit amount. A detent that supports the biasing of the spring;
A wear warning device for a disc brake device, comprising:

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