JPH0552381U - Pad wear alarm device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pad wear alarm device which suppresses a decrease in caliper rigidity and has excellent mounting workability. [Structure] A pair of convex portions 12, 12 is formed on a side surface 8a of the backing metal 7, and a base portion 14 of a sounding body 13 is inserted into a concave portion 12a therebetween. The caulking of the pair of convex portions 12, 12 secures the sounding body 13 to the back metal 7
The width b of the base portion 14 is set to be larger than the width a of the detection portion 15 which is fixed to and is folded back to the base portion 14 of the sounding body 13.
Since the sounding body 13 is fixed to the back metal 7 by caulking the convex portions 12 and 12, it is not necessary to provide a protrusion for fixing the sounding body 13 on the flat surface portion of the back metal 7. The caliper does not need to be formed with a relief for the projection, and the caliper rigidity can be maintained at a high value. Since the width b of the base portion 14 is made larger than the width a of the detection portion 15 to form the sounding body 13 and a working space for mounting the sounding body 13 is secured, the caulking tool is operated on the convex portions 12, 12. It becomes easier and the workability becomes better.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a pad wear alarm device for issuing an alarm to an occupant when a friction member of a disc brake pad wears to an allowable limit.

[0002]

[Prior Art]

 A conventional pad wear alarm device has a protrusion on the back metal of the brake pad, which is formed by the protrusion from the flat surface on the friction member side, on the flat surface on the side opposite to the friction member. The sounding body was set and the projection plate was fixed to the brake pad by caulking the protrusion.

[0003]

[Problems to be solved by the device]

 By the way, in the pad wear alarm device described above, when this device is arranged on the side of the side opposite to the cylinder (cylinder claw) of the caliper of the floating type disc brake (cylinder claw part) side, the cylinder claw part is provided with respect to the protrusion. The escape must be provided, and the provision of this escape may reduce the rigidity of the caliper. In addition, the space for mounting the sounding body is generally narrow, making it difficult to perform the caulking work for mounting the sounding body.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pad wear alarm device that suppresses a decrease in the rigidity of a caliper and has excellent workability in mounting.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a pad wear alarm device in which a sounding plate for alarming wear of the friction member is provided on the back metal of a disc brake pad in which a friction member is held by the back metal. On the side surface of the speaker, a recess is formed to insert the base of the sounding body, and the sounding body is fixed to the backing metal by caulking the edge forming the recess, and is detected by folding back to the base of the sounding body. It is characterized in that the width of the base is set to be larger than the width of the base.

[0006]

[Action]

 With such a configuration, the sounding body is fixed to the back metal by caulking the edge portion forming the recess, so that it is not necessary to provide a protrusion for fixing the sounding body on the flat portion of the back metal. The caliper of the disc brake does not need to have a clearance for the protrusion. Further, since the width of the base portion is made larger than the width of the detection portion to form the sounding body, a work space for mounting the sounding portion can be secured.

[0007]

【Example】

 Hereinafter, a pad wear alarm device according to an embodiment of the present invention will be described with reference to FIGS. The pad wear alarm device 1 is used for a floating type disc brake, for example. In the figure, the carrier 2 has a shape that straddles a disk 3 fixed to an axle (not shown) and has a cylinder portion (not shown) on one side and a cylinder claw portion (not shown) on the other side (illustrated). (Omitted) is movably supported in the axial direction of the disk 3. The inner pad 4 and the outer pad 5 are respectively located between the disc 3 and the cylinder portion and between the disc 3 and the cylinder claw portion, and are supported so as to be movable in the axial direction of the disc 3 and slide on the cylinder. When the inner pad 4 is pressed against the disc 3 by a movably accommodated piston (not shown), the reaction force causes the caliper to move in the direction opposite to the piston movement direction, and the cylinder claw portion moves the outer pad 5 to the disk. It is designed to press 3.

The inner pad 4 and the outer pad 5 have a long shape extending in the rotation direction of the disc 3, and have a structure in which a friction member 6 that abuts on the disc 3 is joined to a back metal 7. A torque transmitting portion that abuts a torque receiving portion 9 of the carrier 2 via a pad spring 10 at a portion of the side portion 8 of the backing metal 7 located in the rotation direction of the disc 3 on the outer side (upper side in FIG. 4) in the radial direction of the disc 3. 11 is formed to project. A pair of protrusions 12, 12 are formed on the side surface 8a of the side portion 8 of the back metal 7 of the outer pad 5 inward in the radial direction of the disc 3 (lower side in FIG. 4), and the recess 12a is formed therebetween. Has been formed. In this embodiment, the convex portions 12 and 12 form the edge portion. The base portion 14 of the sound producing body 13 is inserted into the recess 12a, and the sound producing body 13 is fixed to the back metal 7 as described later.

The sounding body 13 includes a base portion 14 which is inserted into the recess 12 a, a detection portion 15 which is formed by folding back the base portion 14 so as to be substantially parallel to the base portion 14, and a base portion 14 on the tip side of the base portion 14. The tip side claws 16 formed orthogonally to each other and a pair of substantially L-shaped side claws 17, 17 formed on the side portion 8 of the base portion 14 on the bent portion side are roughly configured.

In this case, the width a of the detecting portion 15 is shortened, and the width b of the base portion 14 is relatively larger than the width a 1 of the detecting portion 15.

In this sounding body 13, with the base portion 14 inserted in the gap, the tip side claw 16 is locked to the surface portion of the backing metal 7 on the friction member 6 side, and the pair of side claws 17, 17 are provided. Is set by positioning it by engaging the back metal 7 with the surface opposite to the friction member 6 and sandwiching the back metal 7. In this state that the sounding body 13 is set on the back metal 7, the pair of convex portions 12, 12 are crimped by hitting a tool such as a caulking bar, and the sounding body 13 is integrally fixed to the back metal 7 by this caulking. Has been done.

In this pad wear alarm device 1, when the friction member 6 is worn to an allowable limit due to braking, the detection unit 15 abuts on the disk 3 and vibrates, generating a vibration sound and wearing to the occupant. It will give an alarm.

A pair of convex portions 12, 12 for caulking are provided on the side surface 8 a of the back metal 7, and the sounding body 13 is fixed to the back metal 7 by crimping the pair of convex portions 12, 12. It is not necessary to provide the caulking projection provided on the flat surface of the back metal opposite to the friction member, which is provided on the flat surface, on the flat surface. Therefore, it is not necessary to form a clearance for the caulking projection, which is required for the cylinder pawl portion of the disc brake when the conventional device is used. Therefore, the rigidity of the caliper can be maintained at a high value.

Since the width b of the base portion 14 of the sounding body 13 is set to be larger than the width a of the detection portion 15, a space for mounting the sounding body 13 is secured. Therefore, a tool such as a caulking bar is easily hit on the convex portions 12 and 12, and workability is improved.

In the conventional pad alarm device, it was necessary to carry out the projecting work in order to form the caulking projection on the back metal, but in the present invention, such projecting process is omitted. Productivity can be improved.

In the conventional pad alarm device, when the present device is provided on one of the inner pad and the outer pad, since the caulking projection is formed on one of the pads, the inner pad and the outer pad have different shapes. Therefore, the molding die cannot be shared, but according to the present invention, the molding die can be shared and the production cost can be reduced by not providing the caulking projection as described above.

When a shim is provided on the cylinder claw side of the outer pad or the piston side of the inner pad, and this device is provided on one of the inner pad and the outer pad, in the conventional pad wear alarm device, as described above, As the caulking projections are formed on the pad of the pad, different shapes are required for the inner pad side shim and the outer pad side shim. It is not necessary to install a protrusion, and a common shim can be used on the inner pad 4 side and the outer pad 5 side. Therefore, the shims can be shared and the production cost can be reduced.

In the present embodiment, the case where the pair of convex portions 12 and 12 are provided on the side surface 8a of the backing metal 7 and the base portion 14 of the sounding body 13 is inserted into the concave portion 12a formed therebetween is taken as an example. However, a notch-shaped recess for inserting the base portion 14 of the sounding body 13 is formed on the side surface 8a of the backing metal 7, and the sounding body 13 is fixed to the backing metal 7 by caulking the edge forming the recess. It may be configured to.

[0019]

[Effect of the device]

 Since the present invention is the pad wear alarm device configured as described above, since the sound producing body is fixed to the back metal by caulking the edge portion forming the concave portion, the sound producing body is fixed to the flat portion of the back metal. Since it is not necessary to provide a protrusion for doing so, it is not necessary to form a clearance for the protrusion on the caliper of the disc brake, and the rigidity of the caliper can be maintained at a high value. In addition, the width of the base portion is made larger than the width of the detection portion to form the sounding body to secure a work space for mounting the sounding body, which makes it easier to operate the caulking tool on the edge portion and improves workability. It will be good.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pad wear alarm device according to an embodiment of the present invention.

FIG. 2 is a plan view schematically showing a mounting state of the pad wear alarm device.

FIG. 3 is a view on arrow A in FIG.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a perspective view showing a sounding body of the pad wear alarm device.

[Explanation of symbols]

 1 Pad wear alarm device 5 Outer pad 6 Friction member 7 Back metal 8a Side surface 12 Convex portion 12a Recessed portion 13 Sounding body 14 Base portion 15 Detection portion

Claims (1)

[Scope of utility model registration request] 1. A pad wear alarm device in which a sounding plate for warning wear of the friction member is provided on the back metal of a disc brake pad in which a friction member is held by the back metal, and the sounding body is provided on a side surface of the back metal. While forming a recess for inserting the base of, the sounding body is fixed to the back metal by caulking the edge forming the recess, and compared with the width of the detection part formed by folding back to the base of the sounding body. The pad wear alarm device is characterized in that the width of the base is set to be large.