JP3312286B2 - Disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake used for a vehicle.

[0002]

2. Description of the Related Art An example of a conventional disk brake is disclosed in Japanese Utility Model Laid-Open No. 5-12778. The disc brake disclosed in the publication is provided with an extended portion connected to the cylinder portion of the caliper so as to straddle the inner pad, the disc and the outer pad, and a pair of forked claw portions is provided at the distal end side of the extended portion. An outer pad is provided so as to be able to be pressed, and a wear sensor is attached between the pair of claws of the outer pad.

The wear sensor includes a mounting portion for the outer pad, a pair of extending portions extending in the circumferential direction of the disk from both left and right side portions of the mounting portion toward the radially inner end of the outer pad along the outer pad. A vibrating reed bent in the disk direction is provided on the distal end side of the pair of extended portions so as to go around the radially inner end of the disk of the outer pad. With this disc brake, as the outer pad wears, the tip of the vibrating reed slides on the disc, and the tip vibrates to generate an alarm sound to notify the driver or other passengers that the outer pad has worn. Will be informed.

[0004]

In the above-described disc brake, the vibrating reed is located near the inner end face of the outer pad in the radial direction of the disc. However, the vibrating piece is located between the cylindrical portion on the disc center side and the inner end face of the outer pad. If the gap is extremely narrow, the vibrating reed cannot be provided between them, and it may not be possible to mount the wear sensor itself. Also, the tip of the vibrating reed slides radially inward from the braking surface of the disk against the outer pad (hereinafter referred to as the disk braking surface), that is, the portion where rust is likely to occur. However, even if the tip of the resonator element slides due to the presence of rust and generates an alarm sound, the sound pressure level is not always stable.

In the above-described disc brake, when the wear sensor is mounted, the disc brake is used for positioning the vibrating reed, but it is not a dedicated one and is difficult to position.

The present invention has been made in view of the above circumstances, and has as its object to provide a disc brake capable of stabilizing the sound pressure level of an alarm sound.

[0007]

According to a first aspect of the present invention, there is provided an extended portion which is connected to a cylinder portion of a caliper and straddles an inner pad, a disk, and an outer pad. In the disc brake provided with a pair of forked claw portions capable of pressing the outer pad on the distal end side, a wear sensor is mounted between the pair of claw portions of the outer pad, and the wear sensor is attached to the outer pad, A pair of extending portions extending in the circumferential direction of the disk along the outer pad from both right and left sides of the mounting portion, and a distal end of the pair of extending portions moving away from the disk in the disk axial direction.
Outer pad disc circumference without protruding in the direction
It is formed to bend in the disk direction so as to wrap around the opposite end, and the tip is formed so as to be biased outward in the radial direction of the disk.
Thereby composed of a resonator element, the wear sensor, before
Before attaching to the outer pad, the tip of the pair of extensions
Side is the surface facing the disk with respect to the mounting portion.
It is characterized by being bent to the right side .

According to a second aspect of the present invention , in the first aspect of the present invention , the outer pad is formed so as to be bent in the disk direction so as to go around the inner end of the outer pad in the disk radial direction. A locking piece engaged with the outer pad is provided.

[0009]

According to the first aspect of the present invention , the tip of the resonator element has a
Due to being formed radially outward of the disk ,
The sliding portion of the tip of the vibrating reed with respect to the disk becomes a central portion of a braking surface (hereinafter, referred to as a disk braking surface) for the outer pad of the disk, and is separated from a portion where rust is easily generated. Also wear sensors
Before attaching to the outer pad, the pair of extension portions
Of the disk is opposed to the disk with respect to the mounting portion.
It is bent to the surface side, and the mounting part side part is set to be higher than the tip part of the extension part by a predetermined dimension, so when the friction sensor is mounted on the outer pad, the mounting part is , The distal end side of the extension portion is pushed by the outer pad, and the extension portion contacts the outer pad over the entire surface without any gap. .

According to the second aspect of the present invention , when the wear sensor is attached, the locking piece can be used for positioning, and thereby the wear sensor can be arranged at a correct position.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawing, an inner pad (not shown) and an outer pad 2 are arranged on both sides of a disk 1 fixed to a wheel (not shown), and a caliper 4 is provided on a carrier 3 attached to a non-rotating portion of the vehicle body. It is movably supported in the axial direction of the disk 1 by pins (not shown).

The caliper 4 is provided with a cylinder portion 5 having a cylinder (not shown) which is open to the inner pad and houses a piston (not shown) in a slidable manner. Inner pad, disk 1 connected to cylinder 5
And an extended portion 6 that straddles the outer pad 2.
The distal end side of the extending portion 6 is bent in a direction orthogonal to the axis of the disk 1, and a pair of forked claw portions 7, 7 are formed in this portion.

When the brake fluid is supplied to the cylinder, the piston presses the inner pad against the disk 1, while the caliper 4 moves in the opposite direction to the displacement of the piston due to the reaction force, and the pair of claws 7, 7 Presses the outer pad 2 against the disk 1 to generate a braking force.

The outer pad 2 is composed of a substantially rectangular back metal 8 and a friction material 9 which has a substantially similar shape to the back metal 8 and is overlapped and fixed to the back metal 8. Between the outer pad 2 and the pair of claws 7, a squeal preventing shim 10 substantially similar to the outer pad 2 is interposed so as to be supported by the outer pad 2. Unusual noise from the sliding part between disk 2 and disk 1,
The so-called "squeal" is prevented from occurring. A substantially rectangular notch 11 is formed in the lower part of FIG. 1 between the pair of claws 7 of the squeal prevention shim 10. A wear sensor 12 is attached to a portion of the outer pad 2 corresponding to the notch 11 (between the pair of claws 7, 7 of the outer pad 2) by swaging a convex portion 13 provided on the back metal 8.

The abrasion sensor 12 has a mounting portion 15 formed at the center portion thereof and having a hole 14 into which the convex portion 13 is inserted and supported by the back metal 8 by caulking the convex portion 13, and a left and right side portion of the mounting portion 15. A pair of extensions 16, 16 extending in the circumferential direction of the disk 1 along the outer pad 2, and a vibrating piece 17 formed at the tip end of each of the pair of extensions 16, 16 as described later. ing. The vibrating reed 17 is shown in FIGS.
As shown in FIG.
A disk in the axial direction of the disk 1 (front and back direction in FIG. 1)
1 (in front of the page in FIG. 1, upward in FIG. 3)
The outer end of the outer pad 2 in the circumferential direction of the disk 1 without coming out
In the direction of the disk 1 (see the paper in FIG. 1)
Side (downward in FIG. 3). The tip portion 18 of the vibrating reed 17 is provided offset from the radially inner end face of the friction material 9 of the outer pad 2 radially outward of the disk 1 by a dimension a (offset). As a result, when the outer pad 2 is worn by a predetermined amount, the tip portion 18 of the vibrating reed 17 slides on a portion of the disk 1 which is always in contact with the friction material and is cleaned, thereby generating an alarm sound.

At the lower end of the extension 16 in FIG. 1, a locking piece 19 is formed which is bent in the direction of the disc 1 so as to go around the radially inner end of the back metal 8 of the outer pad 2 in the direction of the disc 1. I have.

Each of the pair of extensions 16 has a longitudinally extending projection 20 projecting in the direction opposite to the position of the disk 1. The tip of the extension 16 of the wear sensor 12 is attached to the mounting portion 15 by a disc as shown in FIG.
1 (a lower side in FIG. 4) , and the mounting portion 15 side portion is set to be higher than the tip portion of the extension portion 16 by the dimension H. It has become something. Note that the wear sensor 12 is a so-called
It has a middle-high shape (that is, the tip of the extension 16 is
The side facing the disk 1 with respect to the mounting portion 15 (FIG. 4)
Lower. ) Is the outer part of the wear sensor 12.
Since it is performed before mounting on the pad 2, the wear sensor
When attaching the 12 to the outer pad 2, as described later
When the protruding part 13 is swaged,
The extension 16 is pushed by the pad 2 and the gap
Will be in contact shortly (see paragraph "0022")
It is.

Next, the operation of the disk brake configured as described above will be described. When the outer pad 2 is worn by a predetermined amount, the tip portion 18 of the vibrating piece 17 slides on the disk 1 to generate an alarm sound. The disk 1
Of the brake pad (hereinafter referred to as a disk braking surface) for the outer pad 2. For this reason, in the prior art, the sound pressure level of the alarm sound was not stable because the sliding portion was radially inward of the disk braking surface, that is, a portion where rust was likely to be generated. According to the invention, the sound pressure level of the alarm sound can be stabilized.

When the wear sensor 12 is mounted, the locking piece 19 can be used for positioning.
Positioning becomes easier. For this reason, the assembling workability is improved, and it is possible to achieve rapid commercialization and, consequently, the cost reduction of the apparatus. Further, the locking piece 19 is attached to the back metal 8 of the outer pad 2.
By being engaged, a part of the load applied to the crimped convex portion 13 can be shared and the load can be reduced when the brake is operated. That is, in other words, the locking piece 19 is
When the brake is activated,
On the other hand, the locking piece 19 is a crimped convex portion 13 side portion (the mounting portion 15).
Part of the load applied to the convex part 13 side part (mounting part 15)
The burden on the user can be reduced. Further, the rotation of the wear sensor 12 can be suppressed by the locking pieces 19.

Since the projections 20 are formed on each of the pair of extensions 16, 16, the rigidity of the extensions 16, and hence the wear sensor 12, is increased. For this reason, the durability of the wear sensor 12, and eventually the entire device, is improved. The same applies to the disk brake shown in Japanese Utility Model Laid-Open Publication No.
20 can be formed. FIG. 8 shows an example of this application.
In FIG. 8, the same members and portions as those of the present embodiment are denoted by reference numerals used in the present embodiment.

The wear sensor 12 is mounted on the mounting portion 15 as described above.
The convex portion 13 is inserted into the hole 14 and the outer portion 2 is attached to the outer pad 2 by caulking the convex portion 13. However, since the convex portion 13 has a middle-high shape as described above, when the convex portion 13 is caulked, the distal end side of the extension portion 16 The extended portion 16 is pressed by the outer pad 2 and abuts on the back metal 8 with no gap over the entire surface. For this reason, even if the manufacturing accuracy of the outer pad 2 is somewhat low, it is possible to prevent the distal end side of the extension portion 16 from being floated from the outer pad 2 and to protrude the distal end portion 18 of the vibrating reed 17 toward the disk 1. Can be made equal to the reference value, and high-precision generation of an alarm sound can be secured.

[0022]

The invention of claim 1 according to the present invention, since a disc brake constructed as described above, by the tip portion of the resonator element is formed biased radially outward of the disk, the resonator element The sliding part of the tip against the disk
Since it becomes the center part of the braking surface for the outer pad of the disc and away from the part where rust is likely to occur, the sound pressure level due to rust is suppressed and the sound pressure level of the alarm sound is stabilized. Can be planned. Also,
Before mounting on the outer pad, the wear sensor
The distal end of the pair of extension portions is
Since the mounting part side is set to be higher than the tip of the extension part by a predetermined size , it is bent when the friction sensor is mounted on the outer pad. When the portion is pressed against the outer pad side, the distal end side of the extension portion is pushed by the outer pad, and the extension portion abuts on the outer pad with no gap over the entire surface. For this reason, even if the manufacturing accuracy of the outer pad is somewhat low, it is possible to prevent the tip side of the extension portion from floating from the outer pad and make the amount of protrusion of the tip end of the vibrating reed to the disk side equal to the reference value. It is possible to secure high-precision generation of alarm sound.

According to the second aspect of the present invention , since the disk brake is constructed as described above, it is possible to arrange the wear sensor at a correct position by using the locking piece for positioning when the wear sensor is mounted. Therefore, the amount of protrusion of the tip end of the resonator element toward the disk can be made equal to the reference value, and high-precision generation of an alarm sound can be secured. Further, the assembling workability is improved, and it is possible to rapidly commercialize the apparatus, and further reduce the cost of the apparatus. Further, since the locking piece is engaged with the outer pad, a part of the load applied to the mounting portion or the like at the time of brake operation can be shared and the load can be reduced. Further, the rotation of the wear sensor can be suppressed by the locking pieces.

[Brief description of the drawings]

FIG. 1 is a front view showing a disc brake according to one embodiment of the present invention.

FIG. 2 is a front view showing a wear sensor of the disc brake and an outer pad to which the wear sensor is attached.

FIG. 3 is a view taken in the direction of arrow A in FIG. 2;

FIG. 4 is a side view showing a wear sensor of the disc brake.

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a view taken in the direction of arrow B in FIG. 2;

FIG. 8 is a front view showing a disc brake using a wear sensor of a different type from the wear sensor.

[Explanation of symbols]

 1 Disc 2 Outer pad 12 Wear sensor 15 Mounting part 16 Extension part 17 Vibration piece 18 Tip of vibration piece 19 Locking piece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-4455 (JP, A) JP-A-5-12778 (JP, U) JP-A 55-43102 (JP, U) JP-A-4- 121549 (JP, U) JP 6-28373 (JP, U) JP 61-204034 (JP, U) JP 57-121438 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) F16D 55/224 112 F16D 66/02

Claims (2)

(57) [Claims] An extended portion is provided so as to straddle an inner pad, a disc and an outer pad in connection with a cylinder portion of a caliper, and a pair of forked claw portions is provided on a tip side of the extended portion so as to press the outer pad. In the provided disc brake, a wear sensor is attached between the pair of claw portions of the outer pad, and the wear sensor is attached to the outer pad, and a pair extending in the circumferential direction of the disc along the outer pad from both right and left sides of the attachment portion. Protruding in the direction away from the disc in the axial direction of the disc at the tip end side of the pair of extensions.
It is bent in the disk direction in such a way as to wrap around <br/> the circumferential end portion side of the outer pad of the disc without, the tip
The vibrating reed is formed so as to be deviated radially outward of the disk , and the wear sensor is attached to the outer pad before being attached to the outer pad.
The distal ends of the pair of extension portions are connected to the mounting portion with the die.
A disc brake characterized by being bent to a side facing a disc. 2. The disk brake according to claim 1, wherein the extension portion is provided with a locking piece bent in the disk direction so as to go around the radially inner end of the outer pad in the disk direction and engaged with the outer pad .