JPH0219637Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a braking body for use in drum brakes and disc brakes.

[Conventional example]

Conventionally, braking force is generated by receiving hydraulic pressure from a master cylinder, which is generated when a car pedal is pressed, and pressing the brake shoe lining (braking body) against a drum attached to the inside of the wheel. There are two known types of brakes: drum brakes that generate braking force, and disk brakes that generate braking force by receiving hydraulic pressure from a master cylinder similar to the above and pressing the lining of pads (braking body) from both sides of a disk that rotates together with the wheels. ing.

The lining of a drum brake is stretched around the outer periphery of a brake shoe that has a T-shaped cross section. That is, the outer periphery of the brake shoe serves as the back metal of the lining. Also, the lining of the disc brake is fixed to the back metal of the pad.

When the brake is used, if the lining wears more than a predetermined amount, there is a risk that the braking action will not be performed reliably, so conventional disc brakes have a backing plate that can detect when the lining has worn a predetermined amount. is equipped with an electric wear sensor.

As an example of this electric wear sensor, as shown in FIG. 7, the inner pad (braking body) 1 of a disc brake is equipped with a groove-shaped notch 3 in which the upper part of a circular hole is opened in the back metal 2 of the inner pad (braking body) 1. An electric wear sensor 4 whose shape almost matches the notch 3 is inserted, and the electric wear sensor 4 is prevented from coming off in the axial direction of the disk by pressing the inner pad 1 provided facing the disk toward the disk. This is done by the piston of the caliper. Further, the electric cord 5 of the electric wear sensor 4 has a structure extending in the radial direction of the disk.

In addition, there are other examples of electric wear sensors (Jetko Kosho 58-
42665), the body 6b of the cylindrical holding member 6 has a flange 6a at one end.
An elastic non-return claw 6c is provided at the upper part by cutting and raising to the inside of the body part 6b, and the holding member 6 is fitted into the through hole 8a formed in the back metal 8 of the pad 7 of the disc brake. The flange 6a of the holding member 6 is engaged with the side surface of the pad 7 of No. 8, and a cylinder (core) (not shown) is inserted into the holding member 6.
Fit it so that its upper end protrudes a predetermined amount from the flange 6a toward the pad 7 side, and insert the pad 7 from above the back metal 8.
The pad 7 is integrally fixed to the back metal 8 by compression molding, the flange 6a is sandwiched between the pad 7 and the back metal 8, the core is removed, and a blind hole 7a is formed in the pad 7 coaxially with the holding member 6. are doing.

On the other hand, a wear limit position detector (probe) (electric wear sensor) consisting of a cylindrical head 9a and a leg 9c having a parallel flat surface 9b extending in the axial direction
9, and an engaging stepped portion 9d is provided between the head portion 9a and the leg portion 9c.

When the probe 9 is attached, the probe 9 is inserted into the holding member 6 from the cylindrical head 9a, and the non-return claw 6c is engaged with the engagement step 9d. When the probe 9 is removed, the probe 9 is inserted into the holding member 6 from the cylindrical head 9a. By rotating around the shaft, the check claw 6f is pressed toward the inner peripheral surface of the through hole 8a, and the probe 9 is pulled out.

[Problem that the invention attempts to solve]

However, in the case of a brake body in which the electric wear sensor 4 of a conventional disc brake is attached, the electric cord extends in the radial direction of the disk, so it is difficult to pull out the electric cord. , there is only space to pull out the caliper through a window formed in the upper center of the caliper, and for this reason, the electric wear sensor 4 is attached to the disk entrance side where the lining 6 of the inner pad 1 has the greatest amount of wear.
There is a problem in that even if the lining is worn down to less than its effective thickness, the electrical wear sensor 4 cannot detect this. Since there is a groove-shaped cutout with an open top,
There was a risk that the strength of the pad would be insufficient.

In addition, the latter disc brake holding member 6,
In the case of a brake body in which the probe 9 is attached, the flange 3a of the holding member 6 fitted into the through hole 8a is locked to the backing metal 8, and the cylinder (core) is inserted into the holding member 6 at its upper end. The pad 7 is fitted so as to protrude upward from the flange 6a, and the pad 7 is compression molded from above the backing metal 8 to integrally fix it to the backing metal 8. Therefore, when the pad 7 is molded and fixed, there is no backstop. It is necessary to fit a core into the holding member 6 in order to make the claw 6c have the same diameter as the body 6b, and in this case, if there is a gap between the holding member 6 and the core, the pad material will enter into this gap. , this must be removed in a later process, and if the core is tightly fitted into the holding member 6, a force in the left and right direction will also be applied to the holding member 6 when removing the core, so the holding member will not be able to hold the pad. There was a risk that the holding member 6 would become loose and the holding member 6 would shake.

The object of the present invention is to provide a braking body for a brake that solves the above-mentioned problems of conventional brakes.

[Means for solving problems]

The present invention has the following configuration to achieve the purpose. That is, a protrusion provided on the surface of a back metal of a lining of a disc brake or a drum brake on the side opposite to the lining, and an electric wear sensor whose tip penetrates the back metal and is fitted into the lining by a predetermined amount; A stopper is fitted onto the electric wear sensor with the tip of the electric wear sensor protruding, and an elastic mounting hole formed in the stopper is fitted into a protrusion of the backing metal to connect to the lining of the backing metal. is caulked to the opposite surface, and a stopper part is formed at the tip of a plate part bent in the middle and extending parallel to the backing metal, and the stopper is bent toward the backing metal side. A non-circular notch groove having approximately the same cross-sectional shape is formed between the back metal and the plate portion, and the stopper rotated after passing through the notch groove is connected to the detent portion and its own elasticity. It consists of a mounting plate that is stopped by force and clamped elastically.

[Effect of idea]

According to the present invention, since the electric wear sensor can be attached to the pad facing the axial direction of the disk, the degree of freedom in the attachment position is increased, and the electric wear sensor is placed on the disk entrance side of the inner pad where the amount of wear is greatest. can be installed to detect when the lining has worn down to its effective thickness at the point of greatest wear on the lining, allowing for prompt replacement of the pad if the lining of the pad has worn a certain amount. Therefore, a reliable braking force can be maintained at all times. Also, since there is no notch formed in the pad back metal as in conventional pads, it is possible to prevent a decrease in the strength of the pads, and it also prevents electrical wear. Since the electric cord of the sensor can be drawn out in the direction of the disk axis, this electric cord can be conveniently passed through a wide space.

In addition, since it is only necessary to attach the mounting plate to the back metal in the post-process after the lining is fixed to the back metal, when the lining is fixed to the back metal of the conventional brake braking body mentioned above, the non-return claw can be attached to the back metal in the same way as the body. When a cylindrical core is inserted into the holding member to make the diameter state, if there is a gap between the holding member and the core, the pad material will enter this gap and must be removed in a subsequent process. In addition, if the core is tightly fitted into the holding member, force in the left and right directions will also be applied to the holding member when removing the core, which may cause the holding member to come loose from the pad and cause the holding member to wobble. This eliminates the trouble of fixing the lining to the back metal.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. Reference numeral 11 in FIGS. 1 and 2 is a carrier for a disc brake, and this carrier 11 is attached to a non-rotating portion of the vehicle.

A caliper 15 having an inner leg portion 13 and an outer leg portion 14 facing both sides of the disk 12 is slidably provided on the carrier 11 via a slide pin 16 . A cylinder 17 is formed in the inner leg portion 13, and a piston (not shown) is slidably provided within the cylinder 17. The end of the piston 18 is brought into contact with an inner pad 19 provided opposite to one side of the disk 12, and an outer pad 20 is provided opposite to the other side of the disk 12.

As shown in FIGS. 3 and 4, the inner pad 19 consists of a back metal 19a and a lining 19b fixed to the back metal 19a. Back money 19a
A protrusion 19c is formed at a predetermined location on the disk entrance side of the inner pad 19, and an electric wear sensor 22 is attached to the protrusion 19c of the back metal 19a via a mounting plate 21. The electric wear sensor 22 is fitted into and fixed to a stopper 23 such that its tip protrudes from the stopper 23.

As shown in FIG. 5, the mounting plate 21 is formed into a stepped shape by bending a band member in the middle. A mounting hole 21a is formed at one end of the mounting plate 21, and the mounting plate 21 is fixed to the back metal 19a by caulking by fitting the mounting hole 21a into the projection 19c of the back metal 19a. The mounting plate 21 is
When the back metal 1 is attached to the back metal 19a,
It has an elastic plate portion 21b extending parallel to 9a. This plate portion 21b is formed with a U-shaped notch groove 21c extending from the other end (rotation prevention portion) 21d of the mounting plate 21 to one end side. Further, the other end 21d of the mounting plate 21 has a backing plate 19.
It is bent toward the back metal side when attached to a.

As shown in FIG. 6, the stopper 23 has a cross-sectional shape that is approximately the same as the notch groove 21c of the mounting plate 21;
That is, it consists of a columnar body having a rectangular cross-sectional shape with rounded ends in the longitudinal direction. This stopper 23
is inserted into the notch groove 21c, and then moved toward the back metal 19a, and the tip of the electric wear sensor 22 is passed through the through hole 19d formed in the back metal 19a, as shown in FIG. Lining 1
9b by a predetermined amount, and then attach the back metal 19a and the mounting plate 21.
At this position, it is rotated about 90 degrees around the electric wear sensor 22, and the elastic force of the mounting plate 21 creates a gap between the back metal 19a and the plate part 21b. They are held in an oppressive manner. In addition, in this state, the stopper 23 is attached to the mounting plate 2.
Since the other end 21d of 1 is bent toward the back plate 19a, it is prevented from rotating. Thereby, the electric wear sensor 22 is prevented from coming off from the inner pad 19.

Therefore, when a disc brake configured as described above is used, normally the amount of wear is greatest on the disc inlet side portion of the lining 19b of the inner pad 19, but in this embodiment, an electric abrasion brake is installed at this position. Since the sensor 22 is installed, the electric wear sensor 22 detects this as soon as the lining 19b is worn down to its effective thickness. Therefore, in such a case, the pad can be quickly replaced, and a reliable braking force can always be maintained. Further, since the back metal 19a of the pad of this embodiment does not have a cutout groove for attaching an electric wear sensor, the strength of the pad can be maintained. In addition, the electric cord 22a of the electric wear sensor 22 is connected to the inner pad 1.
9 to the inner leg 13 side (in the axial direction of the disk), this electrical cord 22
a can be conveniently routed through a wide space on the inner leg 13 side.

In addition, since it is only necessary to attach the mounting plate 21 to the back metal 19a in a post-process after fixing the lining 19b to the back metal 19a, the non-return claw can Holding member 6 to make 6c the same diameter as body 6b
When a cylindrical core is inserted into the holding member 6, if there is a gap between the holding member 6 and the core, pad material will enter this gap and must be removed in a subsequent process. If the core is inserted tightly, a force in the left and right direction will also be applied to the holding member 6 when removing the core, which solves the problem that the holding member 6 may come loose from the pad 7 and cause the holding member 6 to wobble. This is economical because it saves time and effort when fixing the lining to the back metal 8.

In the above embodiment, an example was explained in which the electric wear sensor 22 was attached to the inner pad 19, but the present invention is not limited to this, and the electric wear sensor 22 can be attached to the outer pad 20 as well.

Further, in the above embodiment, the notch groove of the mounting plate 21 is formed into a U-shaped groove, but the shape is not limited to this, and any other shape may be used as long as the notch groove is non-circular.

Further, in the embodiments described above, an example in which the present invention is applied to a disc brake has been described, but the present invention is not limited thereto, and can also be applied to a drum brake. In this case, the outer peripheral plate of the brake shoe inside the lining serves as the back metal of the lining.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
Figure 3 is a partially cutaway sectional view of the main parts, Figure 4 is a view taken in the direction of the arrow in Figure 1, Figure 5 is a perspective view of its mounting plate, and Figure 6 is its electrical system. FIG. 7 is a perspective view showing the relationship between a conventional disc brake braking body and an electric wear sensor. FIG. 8 is a conventional disc brake wear limit position detector. FIG. 3 is a cross-sectional view showing the attached state. 19a... Back money, 19b... Lining, 19
c...Protrusion, 21...Mounting plate, 21a...Mounting hole, 21b...Plate portion, 21c...Notch groove, 21
d...Other end (rotation stopper), 22...Electric wear sensor, 23...Stopper.

Claims (1)

[Scope of utility model registration request] a protrusion provided on a surface of a back metal of a lining of a disc brake or a drum brake on the opposite side of the lining; an electric wear sensor whose tip penetrates the back metal and is fitted into the lining by a predetermined amount; and the electric wear sensor. A stopper is fitted onto the electric wear sensor with the tip of the wear sensor protruding, and an elastic mounting hole formed in the stopper is fitted into a protrusion of the backing metal so that the stopper is opposite to the lining of the backing metal. A stopper part bent toward the back metal side is formed at the tip of a plate part that is caulked to the side surface, bent in the middle, and extended parallel to the back metal part, and the cross-sectional shape of the stopper is formed on the plate part. A non-circular notch groove having approximately the same shape is formed between the backing plate and the plate portion, and the stopper rotated after passing through the notch groove is moved by the elastic force of the detent portion and itself. A braking body comprising a mounting plate that twists to prevent rotation and clamps the plate in an elastic manner.