JPH0749092Y2 - Disc brake pad - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pad provided in a disc brake attached to a vehicle or the like.

(Prior Art) Disc brakes generally generate a braking force by pressing a pair of pads against a disc mounted on the axle side, and the pads usually have a lining attached to a back metal. Has become.

Since the lining wears depending on the frequency of use, it is necessary to replace the pad as appropriate according to the wear of the lining.A sensor for detecting lining wear (hereinafter referred to as a sensor) is attached to the pad to inform the timing of this replacement. There is one attached.

As shown in FIG. 4, this sensor 1 is formed by bending a long steel plate. The base is fixed to the backsides of the backing plates 2a and 3a of the pads 2 and 3 by caulking, and the tip is backing plate. It is attached by projecting a predetermined length from the side of 2a, 3a to the surface side. When the linings 2b, 3b are worn to a predetermined thickness, the tip of the sensor 1 is dragged by the disk 4 and vibrates, and the sound detects wear.

By the way, the linings 2b and 3b do not wear evenly, and when the rotation direction of the disc 4 is set to A as shown in FIG. 4, the inner pad 2 has a large amount of wear on the inlet side of the disc 4 and thus the outer pad. In No. 3, the wear amount on the outlet side of the disk 4 is large. So properly lined 2
In order to detect wear of b and 3b, it is necessary to mount the sensor 1 on the inlet side of the inner pad 2 and the sensor 1 on the outlet side of the outer pad 3.

(Problems to be Solved by the Invention) However, the mounting of the sensor 1 described above has the following problems.

When the linings 2b and 3b are worn and the tip of the sensor 1 is greatly dragged by the disk 4, the inner pad 2
The sensor 1 on the side of the outer pad 3 is in contact with the side surface of the backing metal 2a of the inner pad 2 and its tilt is restricted.
Is not regulated, there is a risk that it will be greatly bent and plastic deformation will occur, and if plastic deformation occurs, the sound generated will be small and the function of the sensor 1 cannot be fulfilled sufficiently. There was a problem.

Therefore, it is conceivable to mount the sensor 1 on the outer pad 3 side also on the inlet side of the disk 4, but as described above,
The outer pad 3 has a lining 3b on the entrance side of the disc 4.
However, since the inner pad 2 and the outer pad 3 have different structures, they cannot be used in common and the cost is increased.

Incidentally, Japanese Patent Application Laid-Open No. 56-90134 discloses the following disc brake. That is, in this disc brake, a through hole is provided in the pad plate (back metal), the free end (tip portion) of the elastic member (sensor) is passed through the through hole, and the through hole is provided in the base end of the elastic member. The elastic member is fixed to the pad plate by penetrating the convex portion provided on the back surface of the pad plate and crimping the convex portion, and the elastic member is provided so that the width direction of the free end is the rotational direction of the disk. .

In this disc brake, the width direction of the free end coincides with the disc rotation direction. Therefore, when the free end of the elastic member hits the disc, the elastic member does not easily vibrate, which causes a large alarm. It may be difficult to generate sound. Further, since the arrangement directions of the free end portion and the base end portion of the elastic member are orthogonal to the disc rotation direction, when the free end portion of the elastic member hits the disc, the elastic member is In some cases, the rotational force about the hole acts, and the strength of the caulked portion of the elastic member deteriorates, so that the durability of the elastic member deteriorates.

The present invention has been made in view of the above circumstances, and can prevent plastic deformation of the sensor to reliably detect wear, enable sharing of the inner pad and the outer pad, and prevent rotation of the sensor to improve durability. It is an object of the present invention to provide a disc brake pad that can generate a large alarm sound.

(Means for Solving the Problem) According to the present invention, a penetrating portion that penetrates the front and back sides is formed in a central portion of a back metal having a lining attached on the front surface side in the disk rotation direction, and In the rotational direction portion or the anti-rotational direction portion, the base end portion of the lining wear detection sensor formed by bending a long plate is fixed, and the width direction of the tip end portion of the sensor is orthogonal to the disc rotation direction,
The tip of the sensor is inserted into the penetrating portion and provided so as to protrude by a predetermined amount on the front surface side of the backing metal. The penetrating portion has the lining worn and the tip of the penetrating portion comes into contact with the disk and the sensor is tilted. At this time, the sensor is in contact with an edge portion of the penetrating portion, and the tip end portion of the sensor is set to a size that maintains a state of protruding to the front surface side of the backing metal.

(Function) Since the tip of the sensor is inserted into the penetrating part formed in the center of the backing metal to which the lining is attached in the disc rotation direction, the penetrating even when the lining is worn and the sensor is dragged by the disc and tilted greatly. The edge of the portion hits the tip of the sensor to regulate tilting. In addition, the sensor
Since the wear of the central portion of the lining in the disk rotation direction is detected, the average wear of the lining is detected.

Since the width direction of the tip of the sensor is orthogonal to the disc rotation direction, the tip of the sensor hits the disc and easily vibrates. Furthermore, since the direction of placement of the tip and base ends of the lining wear detection sensor coincides with the disc rotation direction, when the tip of the sensor hits the disc, the sensor should be fixed at its base end. The rotational force around the center does not act.

(Example) Next, the Example of this invention is described based on drawing.

First, a first embodiment will be described with reference to FIGS. 1 and 2.

A lining 7 is attached to the surface of the backing 6 of the pad 5, and the backing 6 is divided into two halves of the width of the disc (not shown) in the rotation direction (direction A in FIG. 1) of the lining 7. Corresponding to the above, a through hole (penetrating portion) 8 communicating between the front and back is formed. Further, the lining 7 is formed with an escape portion 9 which avoids the through hole 8.

A sensor 10 formed by bending a long steel plate is inserted through the through hole 8 from the back surface side to the front surface side.
Is fixed to the back side of backing metal 6 by caulking, and tip 10b is backing metal 6
A predetermined amount protrudes from the surface of the. Further, the tip 10b of the sensor 10 is inserted so as to be located substantially at the center of the through hole 8. The diameter of the through hole 8 maintains the state in which the tip 10b of the sensor 10 projects from the surface of the backing metal 6 when the sensor 10 is dragged by the disk and tilts greatly and comes into contact with the edge of the through hole 8. The size is set so that it is possible (state of broken line in FIGS. 1 and 2).

The operation of the above configuration will be described.

When the sensor 10 is inserted into the through hole 8 formed corresponding to the bisected position of the width of the disc in the rotation direction of the lining 7, the lining 7 is worn and the sensor 10 is dragged by the disc and tilted. However, since the sensor 10 hits the edge of the through hole 8 and its tilting is restricted, it is possible to reliably generate sound and detect wear without causing plastic deformation.

Further, since the sensor 10 detects the wear of the lining 7 at the bisector of the width in the rotation direction of the disk, the average wear of the lining 7 is detected, and proper wear detection can be performed. The inner pad and the outer pad can be shared.

Next, a second embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals.

The back metal 12 of the pad 11 is formed with a notch (penetrating portion) 13 that communicates the front and back sides corresponding to the bisected position of the width of the lining 7 in the rotational direction of the disk. Cutout 13
In the same manner as the first embodiment, the sensor 10 is provided so as to be inserted from the back surface side to the front surface side. Further, the width of the notch 13 corresponding to the rotation direction of the disc is such that when the sensor 10 is dragged by the disc and tilts greatly and comes into contact with the edge of the notch 13, the tip 10b of the sensor 10 is the surface of the backing plate 6. The size is set to maintain the protruding state. Since the operation of the second embodiment is the same as the operation of the first embodiment, its explanation is omitted.

(Effect of the Invention) As described in detail above, in the disc brake pad of the present invention, since the edge of the penetrating portion hits the tip of the sensor to restrict the tilting thereof, the sensor reliably produces sound without causing plastic deformation. To detect wear of the lining. Since the sensor detects the average wear of the lining, the wear can be properly detected, and the inner pad and the outer pad can be commonly used.

Since the width direction of the tip portion of the sensor is orthogonal to the rotation direction of the disc and the tip portion of the sensor hits the disc and easily vibrates, a loud alarm sound can be generated. Furthermore, the arrangement direction of the tip and base ends of the lining wear detection sensor coincides with the disc rotation direction, and when the tip of the sensor hits the disc, the sensor is centered on the fixing point of the base end. Since the rotational force described above does not act, the strength of the fixed portion of the sensor is not deteriorated, and the durability of the sensor can be improved.

[Brief description of drawings]

1 is a front view of the pad of the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a pad of the second embodiment of the present invention. And Fig. 4 is a view showing an example of a conventional pad as viewed from the radial direction of the disk, 6 ... Back metal 7 ... Lining 8 ... Through hole (penetrating part) 10 ... Sensor for detecting lining wear

Claims (1)

[Scope of utility model registration request] 1. A penetrating portion that penetrates through the front and back is formed in a central portion of a back metal having a lining attached to the front surface side in the disc rotating direction, and the rotating direction portion or the counter rotating direction portion with respect to the penetrating portion of the back metal. , The base end of the lining wear detection sensor in which a long plate is bent is fixed, and the tip of the sensor is penetrated so that the width direction of the tip of the sensor is orthogonal to the disc rotation direction. The penetrating portion is provided so as to be protruded by a predetermined amount on the surface side of the back metal, and the penetrating portion allows the sensor to penetrate when the tip of the pen comes into contact with the disk and the sensor tilts. A pad for a disc brake, which is dimensioned so as to be in contact with an edge portion of the portion and maintain a state in which the tip end portion of the sensor projects toward the front surface side of the back metal.