JPH0564542U - Disc brake - Google Patents

Abstract

(57) [Summary] [Structure] The cylinder portion 11 is provided with a through hole 12 penetrating the caliper 4 and a lid 13 is joined to the caliper 4 so as to close the disk 5 side of the through hole 12. The cover member 35 covers the outer peripheral portion 34 of the joint surface 32 between the lid 13 and the caliper 4. As the covering member 35 covers the outer peripheral portion 34 of the joint surface 32 between the lid 13 and the caliper 4, the outer peripheral portion 3
4 is shielded from the outside, and the outer peripheral portion 34 is not rusted. Therefore, when it is necessary to replace the seal member 33, the lid 13 can always be easily removed from the caliper 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake used for braking a vehicle or the like.

[0002]

[Prior Art]

 The disc brake is provided with a cylinder part for slidably fitting a piston into the caliper. To process the cylinder part, a claw part (reaction part) provided facing the cylinder part is provided. It is common to have a semi-circular cutout (recess) in the bracket. On the other hand, as another type of disc brake, for the purpose of facilitating manufacturing, a cylinder portion into which a piston is slidably inserted is provided with a through hole penetrating the caliper and the non-disc side of the through hole is closed. Therefore, a structure in which a lid is joined to the caliper is disclosed (Japanese Patent Publication No. 61-52331). In this disc brake, a seal member is provided in the joint surface between the lid and the caliper to prevent the brake fluid from leaking from the cylinder portion.

[0003]

[Problems to be solved by the device]

 In a general disc brake with a notch provided in the pawl portion of the caliper, the presence of the notch causes insufficient caliper rigidity and limits the pad pressing method. Performance was not the best. In addition, in the other type of disc brake described above, it is necessary to remove the lid when replacing the seal member provided in the joint surface between the lid and the caliper. Since the outer peripheral part of the surface is exposed to the outside as it is, there is a problem that rust is generated in this part and it is difficult to remove the lid.

Therefore, an object of the present invention is to adopt a configuration in which a lid is provided on the caliper so that the shape of the claw portion can be arbitrarily set, and a rust is provided on the outer peripheral portion of the joint surface between the lid and the caliper. It is an object of the present invention to provide a disc brake which can easily remove the lid body without causing any trouble.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the disc brake of the present invention has a piston slidably fitted in a cylinder portion provided in a caliper and a pad that is pressed by the sliding of the piston and comes into contact with the disc. The cylinder portion is provided with a through-hole penetrating a part of the caliper and a lid is joined to the caliper so as to close the disk side of the through-hole, and the lid and the caliper are formed. A seal member is provided in a joint surface between the lid and the caliper, and a covering member that covers an outer peripheral portion of a joint surface between the lid and the caliper is provided.

[0006]

[Action]

 According to the disc brake of the present invention, since the covering member covers the outer peripheral portion of the joint surface between the lid and the caliper, the outer peripheral portion is shielded from the outside and rust may be generated on the outer peripheral portion. Absent.

[0007]

【Example】

 Hereinafter, a disc brake according to an embodiment of the present invention will be described with reference to FIGS.

In the figure, reference numeral 1 is a disc brake of this embodiment. The disc brake 1 includes a carrier 2 fixed to a non-rotating portion of a vehicle, a pair of pads 6 arranged on the carrier 2 so as to sandwich a disc 5, and sliding guide portions 3 of the carrier 2 at two places. It is mainly composed of a caliper 4 supported so as to be slidable in the axial direction of the disk 5. Here, both pads 6 are supported by a pair of pad guides 7 provided inside the sliding guide portion 3 of the carrier 2 so as to face each other so as to be slidable in the direction along the axis of the disk 5. ing. When the brake pedal is depressed, the disc brake 1 has a piston 9 provided on one side through the bridge portion 8 of the caliper 4 and a claw portion 10 provided on the other side so as to face the piston 9. Hold the both pads 6 from both sides via the disk 5 and press them in the direction of the disk 5, whereby the both pads 6 and the disk 5 are brought into contact with each other and friction is generated between them to rotate the wheel. To weaken the vehicle.

The caliper 4 is provided with a cylinder portion 11 in which a piston 9 is slidably fitted so as to perform the above-described operation, facing a pawl portion 10. The cylinder portion 11 includes the disk 5 A part of a through hole 12 (described later) provided through the portion of the caliper 4 on the side opposite to the claw portion 10 parallel to the axial direction of the caliper 4 and the side of the through hole 12 opposite to the disk 5 to close the caliper 4. And the end surface 14 of the lid 13 on the side of the disk 5 which is joined to. Here, the end surface 15 of the caliper 4 on the side opposite to the claw portion 10 is formed so as to be orthogonal to the axis of the disk 5, and the outer surface of the caliper 4 extends from this end surface 15 to a predetermined position on the side of the claw portion 10. A circular outer portion 4a having a circular shape is formed, and a caliper side concave portion 16 recessed one step from the outer peripheral surface is formed on the entire circumference at a predetermined position in the middle of the circular outer portion 4a.

The through hole 12 is provided in a middle portion of the piston sliding hole 17 having a diameter slightly larger than the outer diameter of the piston 9 and on the side opposite to the disc 5 of the piston sliding hole 17. In addition, a screw forming pilot hole 18 having a diameter larger than the piston sliding hole 17 by a predetermined amount, a female screw portion 19 formed in a predetermined portion of the screw forming pilot hole 18 on the side opposite to the disc 5, and the female screw portion. 19 and a taper hole portion 20 having a taper shape formed from the side opposite to the disc 5 to the end surface 15 of the caliper 4, and one end of the piston sliding hole portion 17 on the side of the disk 5 is a piston. The other end of the boot 21 fitted on the outer peripheral surface of the disk 9 on the side of the disk 9 is fitted with a fitting groove 22 having a larger diameter than the piston sliding hole 17 in the circumferential direction. At the end of the disk 5 side, the extension of the boot 21 A storage hole 24 for storing the contracted portion 23 and having a diameter larger than that of the piston sliding hole 17 by a predetermined amount is provided. Here, the piston sliding hole portion 17 is provided with a predetermined seal groove 26 into which the piston seal 25 that prevents the brake fluid from leaking through the gap between the piston sliding hole portion 17 and the outer peripheral surface of the piston 9 is fitted. It is formed at the position over the circumferential direction. Since the through hole 12 and the seal groove 26 formed therein are processed by inserting the tool from the side opposite to the claw portion 10 of the caliper 4, the tool and the claw portion 10 are processed. Since there is no need to consider interference, the manufacture thereof is very easy, and since the recess for allowing the tool to pass through the claw portion 10 is unnecessary, the area of the claw portion 10 for pressing the pad 6 is increased and the disc brake Squeaking can be suppressed.

The lid 13 has a male screw portion 27 that is screwed into the female screw portion 19 of the caliper 4, and has a diameter smaller than the screw groove diameter of the male screw portion 27 provided on the side opposite to the disk 5 of the male screw portion 27. It has a shaft portion 28 and a flange portion 29 provided on the side opposite to the disk 5 of the shaft portion 28 and having a diameter larger than that of the shaft portion 28 by a predetermined diameter. 30 penetrates in parallel to the axial direction of the disk 5. The outer diameter of the flange portion 29 of the lid 13 is substantially the same as the outer diameter of the circular outer shell portion 4a of the caliper 4, and the outer peripheral surface of the flange portion 29 has an intermediate portion. A lid-side recess 31 that is recessed one step from the outer peripheral surface is formed on the entire circumference.

Further, in the state where the male screw portion 27 of the lid 13 is screwed into the female screw portion 19 of the caliper 4 and the flange portion 29 of the lid 13 is brought into contact with the end surface 15 of the caliper 4 to join them, A seal member 33 made of an elastic material that seals the joint surfaces 32 and prevents the brake fluid from leaking from the cylinder portion 11 side is fitted between the tapered hole portion 20 of the caliper 4 and the shaft portion 28 of the lid 13. Has been done. Here, the same seal member 33 as the piston seal 25 is used. In the joined state, the piston sliding hole portion 17, the portion of the thread forming pilot hole portion 18 where the female screw portion 19 is not formed, the portion of the female screw portion 19 that is not screwed into the male screw portion 27, and the lid body. An end surface 14 of the disk 13 on the disk 5 side forms a cylinder portion 11.

In the present embodiment, the outer peripheral portion 34 of the joint surface 32 between the lid 13 and the caliper 4 that faces the outside is provided with a dust boot 35 that is a covering member that covers the outer peripheral portion 34. .. The dust boot 35 is made of an elastic material having a sealing property, and has a ring-shaped caliper-side fitting portion 36 that is fitted into the caliper-side concave portion 16 provided in the caliper 4 by elastic force without a gap, and the lid 13. It is composed of a ring-shaped lid-side fitting portion 37 that is fitted into the provided lid-side recess 31 by a resilient force without a gap, and a joint portion 38 that is integrally molded with these and that joins them without a gap. ing.

According to the disc brake having the above-described configuration, the dust boot 35, which is the covering member, completely covers the outer peripheral portion 34 of the joint surface 32 between the lid 13 and the caliper 4, which is exposed to the outside. The outer peripheral portion 34 is shielded from the outside, so that water or the like does not reach the outer peripheral portion 34 and rust does not occur. Therefore, when the seal member 33 deteriorates due to aging or the like and the seal member 33 needs to be replaced, the dust boot 35 made of an elastic material is removed from the caliper 4 and the lid body 13, and then the lid body is removed. The lid 13 can be easily removed by unscrewing the 13 and the caliper 4. Further, as described above, according to the present embodiment, the outer peripheral portion 34 is covered by forming the caliper side concave portion 16 on the caliper 4 and the lid body side concave portion 31 on the lid body 13 while covering the outer peripheral portion 34 with these. It can be realized with a simple configuration in which the dust boot 35 fitted to the above is provided.

[0015]

[Effect of the device]

 As described above in detail, according to the disc brake of the present invention, since the covering member covers the outer peripheral portion of the joint surface between the lid and the caliper, the outer peripheral portion is shielded from the outside and the outer peripheral portion is covered. Rust does not occur, so that the lid can always be easily removed from the caliper when the seal member needs to be replaced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a disc brake according to an embodiment of the present invention.

FIG. 2 is a plan view showing a disc brake according to an embodiment of the present invention.

FIG. 3 is a front view showing a disc brake according to an embodiment of the present invention, in which the right side portion is a cross section.

[Explanation of symbols]

 1 Disc Brakes 4 Calipers 5 Discs 6 Pads 9 Pistons 11 Cylinders 12 Through Holes 13 Lids 32 Bonding Surfaces 33 Sealing Members 34 Outer Peripherals 35 Dust Boots (Coatings)

Claims (1)

[Scope of utility model registration request] 1. A caliper has a piston slidably fitted in a cylinder portion, and a pad that is pressed by the sliding of the piston and comes into contact with a disk, wherein the cylinder portion is a part of the caliper. A disk provided with a through hole penetrating the portion and a lid body joined to the caliper so as to close the side opposite to the disk of the through hole, and a disc having a seal member in a joint surface between the lid body and the caliper. In the brake, a disc brake is provided with a covering member that covers an outer peripheral portion of a joint surface between the lid body and the caliper.