JP2000027904A - Pin slide type disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the caliper rattle sound and to reduce the cost by providing a plurality of tongue pieces having spring elasticity on the inside of a retainer, and passing a slide pin thereto to hold the slide pin by the tongue pieces. SOLUTION: A retainer 10 is formed by pressing one metal plate. A body part 12 and a tongue piece 13 having spring elasticity are formed by slitting a slit 15 a circular material metal plate and bending the inside of the part forming a collar 11 is bent by a pressing machine. At least two tongue pieces 13 are provided in positions for receiving the load of a caliper. The umber of the tongue pieces 13 is preferably set to three or more, and in this example, three tongue pieces 13 are circmferentially provided at a fixed pitch. The tip of the tongue piece 13 is warped in order to eliminate the catching of a slide pin. Since the tongue pieces 13 are thrown around the slide pin with a fastening margin to hold the slide pin by the tongue pieces 13, the slide pin can be prevented from being shockingly touched to the inner surface of a pin hole by vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin-slide type disc brake which has a countermeasure against caliper noise.

[0002]

2. Description of the Related Art A caliper guide portion of a caliper floating mechanism in a pin slide type disc brake is provided with a slide pin fixed to one of a caliper and a fixing member, which is slidably inserted in a pin hole provided in the other member in a disc axial direction. It is composed. The caliper guide portion covers the outer periphery of the slide pin with a pin boot in order to protect the pin slide portion. The pin boot has one end locked to the outer periphery of the fixed end of the slide pin and the other end locked to the pin hole entrance side of the pin hole forming member. However, if the locking groove is formed on the outer periphery of the pin hole forming member, the slide pin collides with the inner surface of the pin hole due to vibration during vehicle running, generating abnormal noise (carry rattle sound). .

[0003] The present applicant has proposed a structure capable of solving these problems in Japanese Utility Model Publication No. Hei 7-14661.

[0004] As shown in FIG.
A retainer 20 is press-fitted and fixed to the mouth of the pin, and a cylindrical portion 8 is formed on the pin hole inlet side of the pin hole forming member (torque member 4 in the figure), and one end of a pin boot 6 fitted on the outer periphery of the cylindrical portion 8. Is locked to the flange 21 of the retainer 20.

A rubber 23 integrally molded is provided on the inner periphery of the annular body 22 of the retainer 20, and the slide pin 3 is held by the retainer 20 via the rubber 23.

[0006]

In the structure shown in FIG. 5, it is not necessary to form an engaging groove on the outer periphery of the cylindrical portion 8, and the rubber 23 is not required.
Is used as a cushioning material to prevent carry rattle noise.However, since rubber is integrated with the molded retainer,
The manufacturing cost of the retainer is high.

In addition, since the slide pin 3 comes into contact with the rubber 23 having the interference, the slide resistance of the slide pin is large (the rubber 23 hits the slide pin 3 locally at several places. , Still large sliding resistance),
Sticks (snagging) during sliding are also likely to occur, making it difficult to smooth the caliper slide.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the retainer to reduce the cost required for attenuating and preventing the carry rattle sound and to reduce the sliding resistance of the slide pin.

[0009]

According to the present invention, there is provided a retainer in which a flange is provided at one end of a body at an inlet-side mouth of a pin hole for inserting a slide pin of a caliper floating mechanism. Press-fit and fixed, one end of the pin boot is locked to the flange of the retainer, and the pin boot covers the exposed portion of the slide pin to protect the pin slide portion. A plurality of tongue pieces having spring elasticity are provided, and the slide pins are passed through the inner peripheral portion of the retainer, and the slide pins are held by the tongue pieces.

It is preferable that the retainer is formed integrally with the flange, the body, and the tongue by pressing a single metal plate.

It is also preferable to provide a coating layer on the surface of the tongue piece, which has a lower frictional resistance and a higher wear resistance than the base material of the tongue piece brought into contact with the slide pin. As a coating that meets the demand, for example, there is “Teflon (trade name) coating” made of a fluorine resin.

[0012]

[Function] Since the slide pin is held by the spring elastic tongue provided on the retainer, the collision of the slide pin against the inner surface of the pin hole can be prevented without the rubber molded integrally with the retainer, and the rubber mold after the retainer is formed. The manufacturing cost can be reduced by eliminating the steps. In the case where the retainer is formed of a single metal plate, it is not necessary to attach a tongue piece later, and the desired retainer can be made only by pressing, so that the cost reduction effect is particularly large.

Further, when the tongue piece is formed of metal, metal / metal contacts the slide pin, so that the slide resistance of the slide pin is reduced and the stick at the time of sliding is also prevented. The one with the ceramic coating layer on the tongue is
The effect of reducing the sliding resistance is further enhanced.

[0014]

1 to 3 show an embodiment of a disc brake according to the present invention. The brake shown in the figure is an example in which the slide pin 3 is fixed to the caliper 2.

As shown in FIG. 1, in a vehicle brake, a caliper guide portion 1 constituting a caliper floating mechanism is provided on a reciprocating side and a revolving side of a disk D, respectively.

The caliper 2 has a built-in piston (not shown) on the inner side (right side in the figure), and when the inner side friction pad 7 is pressed against the disc D by the piston, the caliper 2 is reacted by a force. By sliding to the right, the outer friction pad 7 is also pressed against the disk D by the outer pawl of the caliper, and a braking force is generated.

FIG. 2 is an enlarged sectional view of a portion AA in FIG.

The caliper guide portion 1 has a pin hole 5 provided on a torque member 4 with a slide pin 3 fixed to the caliper 2.
And the exposed portion of the slide pin 3 is covered with a pin boot 6.

One end of the pin boot 6 is provided with a locking groove or the like on the outer periphery of the fixed end side of the slide pin 3 and locked therein, and the other end is a flange 11 of a retainer 10 press-fitted and fixed to the mouth of the pin hole 5. It is locked to.

The torque member 4 has a cylindrical portion 8 on the inlet side of the pin hole 5 to which the other end of the pin boot 6 is fitted.
Further, a seat hole 9 is provided at the entrance of the pin hole 5, and the body 12 of the retainer 10 is press-fitted into the seat hole 9.

FIG. 3 shows the details of the retainer 10. The retainer 10 is made by pressing a single metal plate. A cut 15 defining a tongue piece is formed in a circular metal plate, and the inside of a portion to be a flange 11 is pressed and bent by a press machine to produce a body 12 and a tongue piece 13 having spring elasticity. At least two tongue pieces 13 are provided at positions that can receive the load of the caliper. Preferably, three or more tongue pieces 13 are provided at a constant pitch in the circumferential direction.

The tip of the tongue piece 13 is warped as shown in FIG. 3C in order to prevent the slide pin from being caught. The tongue piece 13 is hung on the outer periphery of the slide pin 3 with a tight allowance, and the slide pin 3 is attached to the tongue piece 13.
Hold with. This prevents the slide pin 3 from impacting the inner surface of the pin hole 5 by vibration.

The retainer 10 has a structure in which a metal body plate is drawn to form a cylindrical body projecting from one end of the flange, and a part of the body is cut and raised to form a tongue piece. Good.

The retainer 10 formed by pressing a metal veneer has a coating layer 14 (FIG. 3D) having a smaller coefficient of friction than the material metal of the retainer, on the contact surface of the tongue 13 with the slide pin. (For example, the above-mentioned Teflon coating), and the presence of the coating layer 14 makes the sliding resistance of the slide pin 3 smaller.

FIG. 4 shows a retainer made by pressing a metal plate obtained by compounding rubber. This retainer 10
There is a rubber layer 16 in contact with the slide pin 3 on the inner side of the tongue piece 13, which has a structure similar to that of the conventional product shown in FIG. 5. However, unlike the conventional product in which the rubber is integrated after the retainer molding, the rubber is compounded in advance. The manufacturing cost is lower than that of the conventional product because the metal plate is pressed and made. In addition, since the effect of reducing the sliding resistance due to the elastic deformation of the tongue piece 13 is obtained, the sliding resistance of the slide pin is smaller than that of the conventional product. Therefore, the effect of the present invention can be exerted to some extent even if a composite material of rubber is used as the material metal plate of the retainer 10.

[0026]

As described above, according to the present invention, the retainer for locking the pin boot end is provided with a plurality of tongue pieces having spring elasticity, and the slide pin is held by the tongue pieces to prevent carry rattle noise. Therefore, the cost can be reduced by omitting the rubber molding step after the retainer molding.

When the tongue piece is made of metal, the sliding resistance of the slide pin is reduced, the stick is prevented, and the caliper slides smoothly. As shown in FIG. 1, when two sets of the caliper guides are provided in parallel, if a stick occurs on one side, it is triggered and the caliper swings clockwise and counterclockwise alternately, but the caliper slide becomes awkward. However, the poor stability of the slide caused by the stick can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a disc brake to which the present invention is applied.

FIG. 2 is an enlarged sectional view taken along line AA of FIG. 1;

3A is a front view of an embodiment of a retainer employed in the present invention. FIG. 3B is a cross-sectional view taken along the line BB of the retainer. FIG. 3C is an enlarged side view of a tip of the tongue. The figure which shows the example which provided the coating layer on the surface

FIG. 4 is a cross-sectional view of another embodiment of the retainer.

FIG. 5 is a sectional view of a caliper guide portion of a brake to be improved according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Caliper guide part 2 Caliper 3 Slide pin 4 Torque member 5 Pin hole 6 Pin boot 7 Friction pad 8 Cylindrical part 9 Seat hole 10, 20 Retainer 11, 21 Flange 12, 22 Body 13 Tongue piece 14 Coating layer 15 Cut 16 Rubber layer 23 Rubber D disk

Claims (3)

[Claims] 1. A retainer having a flange provided at one end of a body portion is press-fitted and fixed to an inlet-side mouth portion of a pin hole for inserting a slide pin of a caliper floating mechanism, and one end of a pin boot is locked to the flange of the retainer. In a pin-slide type disc brake for protecting an exposed portion of the slide pin by covering the exposed portion of the slide pin with the pin boot, a plurality of tongue pieces having spring elasticity are provided on an inner periphery of the retainer, and an inner periphery of the retainer is provided. A pin slide-type disc brake, wherein said slide pin is held by said tongue piece through said slide pin. 2. The pin-slide type disc brake according to claim 1, wherein a flange, a body, and a tongue of the retainer are integrally formed by pressing a single metal plate. 3. The pin-slide type disc brake according to claim 1, wherein a coating layer having a smaller frictional resistance than a base material of the tongue piece brought into contact with the slide pin is provided on a surface of the tongue piece.