JP2553867Y2 - 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 disc brake used for braking a vehicle or the like.

[0002]

2. Description of the Related Art A disk brake is provided with a cylinder portion for slidably fitting a piston into a caliper of the disk brake. In order to machine the cylinder portion, a claw provided opposite to the cylinder portion is provided. It is common that a recess (reaction portion) is provided with a recess cut out in a semicircular shape. Here, the general disc brake has a problem that the rigidity of the claw portion is insufficient due to the presence of the recess, and the performance of preventing the squeal of the disc brake cannot be said to be the best. For this reason, the present applicant has provided a through-hole in the portion of the caliper on the side opposite to the claw section so that the shape of the claw section can be set arbitrarily without providing a recess, and A structure that is closed by a lid, that is, a through hole or the like is processed by inserting a tool from the side of the caliper opposite to the claw, and then the opening on the opposite side of the caliper provided for the above processing is attached to the caliper. A prior application has been filed with respect to a disk brake employing a configuration in which a cylinder portion is formed by screwing into a cylinder (Japanese Utility Model Application No. 4-4318).

[0003]

However, in the disc brake of the type in which the through hole and the like of the caliper are machined from the bottom side of the above-mentioned application, the lid for closing the opening on the side opposite to the claw portion is screwed. Since it is necessary to form a threaded portion on the caliper for performing the process, there is a problem that the machining of the threaded portion is required after the caliper casting in addition to the machining of the through hole and the like, so that the machining time becomes long.

Accordingly, an object of the present invention is to adopt a configuration in which a lid is provided on a caliper so that the shape of a claw portion can be arbitrarily set, and to shorten the processing time of the caliper after casting. The purpose is to provide a disc brake.

[0005]

In order to achieve the above object, a disk brake according to the present invention comprises a cylinder portion for slidably fitting a piston, a claw portion provided opposite to the cylinder portion, and the cylinder portion. A caliper having a connecting portion for connecting the portion and the claw portion, and a pair of pads arranged opposite to each surface of the disc and held between the piston and the claw portion and contacting the disc. ,
The cylinder portion is configured by providing a through hole penetrating a part of the caliper on the side opposite to the claw portion, and screwing a lid to the caliper to close the side opposite to the claw portion of the through hole. The caliper has a cast portion including the claw portion and the connection portion, and the through hole is provided inside, and a screw portion for screwing the lid to an inner peripheral portion or an outer peripheral portion of one end opening is provided. And a tubular member cast into the casting part with the other end opening facing the claw part.

[0006]

According to the disc brake of the present invention, a screw portion for screwing the lid body to the inner peripheral portion or the outer peripheral portion of the one end opening of the cylindrical member is formed in advance, and then the caliper is mounted thereon. At the time of casting, the tubular member is cast into the casting portion with the other end opening facing the claw portion. Accordingly, when the through hole of the caliper is processed after the casting, the thread portion is already formed in the caliper, so that the thread portion does not need to be processed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disc brake according to an embodiment of the present invention will be described below with reference to FIGS.

In FIGS. 1 and 2, reference numeral 1 denotes a disc brake of the present embodiment. This disc brake 1
Is a carrier 2 fixed to a non-rotating portion of the vehicle, a pair of pads 4 arranged so as to sandwich the disc 3 on the carrier 2, and two sliding guides 5 of the carrier 2 in the axial direction of the disc 3. And a caliper 6 supported to be slidable along. Here, both pads 4 are supported so as to be slidable in the direction along the axis of the disk 3 by a pair of pad guides 7 provided at positions inside the sliding guide portion 5 of the carrier 2 so as to face each other. ing.

When a brake pedal (not shown) is depressed, the disc brake 1 is provided on one side through a connecting portion 8 of the caliper 6 and is provided on the other side so as to face the piston 9. The claw portion (reaction portion) 10 sandwiches both pads 4 from both sides via the disk 3 and presses them in the direction of the disk 3, thereby bringing both pads 4 into contact with the disk 3 and causing them to contact each other. The friction is generated to weaken the rotation of the wheels and brake the vehicle.

The caliper 6 is made of a light alloy such as aluminum. The claw 10, the cylindrical member holding portion 11 provided opposed thereto, and the connecting portion for connecting these without interfering with the disk 3. And a tubular member 13 made of steel or the like cast into the tubular member holding portion 11 of the cast portion 12 along the axial direction of the disk 3.

The cylindrical member 13 is an integral member formed by processing a steel pipe or the like, and has one opening (an opening at the other end) 14.
(See FIG. 3) is disposed on the casting part 12 so as to face the claw part 10, and the large-diameter part 15
However, an intermediate portion 16 having a smaller diameter by a predetermined amount than the large diameter portion 15 is provided on a side of the large diameter portion 15 opposite to the claw portion 10. A tapered step 17 that is inclined at a predetermined angle is provided at the boundary between the large diameter portion 15 and the intermediate portion 16. A small-diameter portion 18 having a smaller diameter than the intermediate portion 16 by a predetermined amount is provided on a side of the intermediate portion 16 opposite to the claw portion 10,
A screw portion 19 is formed at a predetermined position on the outer peripheral portion of the small diameter portion 18 on the claw portion 10 side. Furthermore, an opening (one end opening) of the small-diameter portion 18, that is, the cylindrical member 13, opposite to the claw portion 10.
At the end on the side of 20 (see FIG. 3), a tapered portion 21 inclined at a predetermined angle is formed. In addition, the step portion 22 at the boundary between the intermediate portion 16 and the small diameter portion 18 is
It is substantially flush with the end face 23 on the side opposite to the claw portion 10.

An inner peripheral portion of the cylindrical member 13, that is, a through hole 13a forms a part of a cylinder portion 24 into which the piston 9 is slidably fitted. The piston sliding hole 25 having a diameter slightly larger than the outer diameter of the piston 9 is provided on the claw 1 of the piston sliding hole 25.
On the 0 side, a fitting groove 27 having a diameter larger than the piston sliding hole 25 by a predetermined amount is fitted with the other end of the boot 26 having one end fitted to the outer peripheral surface of the piston 9 on the claw 10 side. At the end on the claw portion 10 side, a storage hole portion 29 having a predetermined diameter larger than the piston sliding hole portion 25 for accommodating the elastic portion 28 of the boot 26 is provided all around. Have been. In addition,
A seal groove 31 in which a piston seal 30 for preventing leakage of brake fluid through a gap between the piston slide hole 25 and the outer peripheral surface of the piston 9 is fitted in the piston slide hole 25 at a predetermined position. Is formed.

A cover 32 for closing the opening 20 is provided at an end of the cylindrical member 13 opposite to the claw portion 10. That is, the lid 32 has a substantially cylindrical shape with a bottom having a disk-shaped bottom portion 33 and a cylindrical portion 34 having one end closed by the bottom portion 33.
The cylindrical member 13 is provided on the inner peripheral portion on the side opposite to the bottom portion 33.
A threaded portion 35 that is screwed into the threaded portion 19 is formed, and a fitting portion 36 that fits into the end of the small diameter portion 18 of the tubular member 13 is formed on the bottom 33 side of the threaded portion 35. I have. A screw for engagement is engaged with the outer peripheral portion of the cylindrical portion 34 on the bottom 33 side when the lid 32 is screwed to the cylindrical member 13, and rotational torque is transmitted from the tool. An engagement groove 37 having a concave shape is provided. In addition, a brake fluid supply hole 38 penetrates in the center of the bottom 33 along the axial direction of the disk 3, and a bleeder 39 for bleeding air is provided in the bottom 33 as shown in FIG. 2. ing.

A lid 32 is screwed onto the cylindrical member 13, and a lid 3 is attached to the end surface 40 of the cylindrical member 13 on the side opposite to the claw portion 10.
In the state where the bottom 33 of the second member abuts, the brake fluid in the cylinder portion 24 is formed between the bottom portion 33 of the lid 32 and the inside of the boundary between the cylindrical portion 34 and the tapered portion 21 of the cylindrical member 13. A cover seal 41 is provided to prevent leakage through the joint portion between the member 13 and the cover 32, and a portion facing the outside of the proximity surface between the cover 32 and the casting 12 is provided with this portion. A dust boot 42 is provided to cover and protect the device and prevent intrusion of water, dust and the like. In the above-mentioned joint state, the through hole 13a and the bottom surface 4 of the lid 32 on the claw portion 10 side are formed.
3 constitutes the cylinder part 24.

In the disk brake 1 having the above-described structure, the tubular member 13 is formed by cutting a steel pipe or the like into a predetermined length in advance and excluding the tapered portion 21, that is, the large diameter portion 15, the tapered step portion 17, and the intermediate portion. Thread portion 1 on all outer peripheral sides and small diameter portion 18 of portion 16, step portion 22 and small diameter portion 18
9 are processed to form a semi-processed state. Then, a plurality of the cylindrical members 13 in the semi-processed state are manufactured and stocked,
The stepped portion 22 is sequentially placed in a casting machine having a mold having a shape of a general caliper.
Of the casting part 1
2 is placed at a predetermined position, and in this state, a predetermined process such as pouring a molten metal such as an aluminum alloy into the mold is performed. As a result, as shown in FIG. 3, the cylindrical member 13 in the semi-machined state is
Thus, the caliper 6 before casting the through hole 13a is obtained. Then, a plurality of calipers 6 before processing the through holes 13a are manufactured and stocked.

Then, the caliper 6 before processing the through hole 13a is sequentially clamped to a processing machine, and the through hole 13a and the like, ie, the storage hole 29, the fitting groove 27, the piston sliding hole 25, the seal groove 31, The caliper 6 is formed by processing the end face 40, the tapered portion 21, and the like along the two-dot chain line shown in FIG. Here, the through hole 1
Since the processing of 3a and the like is performed by inserting a tool from the side opposite to the claw portion 10, it is not necessary to consider interference between the tool and the claw portion 10, and its manufacture is very easy, and A recess for passing the tool through the claw portion 10 is not required, so that the rigidity of the claw portion 10 is improved and the squeal of the disc brake 1 can be further suppressed.

The caliper 6 thus formed is fitted with, for example, a piston seal 30 and the piston 9 is fitted from the side opposite to the claw portion 10, and then the boundary portion between the bottom portion 33 and the cylindrical portion 34. Lid seal 41 inside
Is screwed to the threaded portion 19 of the cylindrical member 13 protruding.

As described above, the disc brake 1 of the present embodiment is in a state in which the screw portion 19 is already formed in the caliper 6 when the through hole 13a of the caliper 6 is machined. There is no need to machine the screw portion 19. Therefore, the processing time of the through hole 13a and the like after casting can be reduced.

Moreover, when a steel material is used as the tubular member 13, especially when the cast portion 12 is made of an aluminum light alloy as described above, the tubular member 13 serves as a reinforcing material to improve the strength and the like of the caliper 6. Can be done. Similarly, when a steel material is used as the tubular member 13, the steel material has very good workability with respect to a cast product, so that the through-hole 13 a and the screw portion 19 and the like are processed from the cast product. Tool life and the like will be improved.

In the above embodiment, the case where an aluminum alloy is adopted as the material of the cast portion 12 for the purpose of weight reduction or the like has been described as an example. However, the material is not limited as long as it is suitable for casting. Various materials can be applied without the need. For example, cast iron also exerts a good effect. In addition, although an example in which the screw portion 19 is provided on the outer peripheral portion of the cylindrical member 13 has been described, a screw portion may be provided on the inner peripheral portion. In this case, the cylindrical member is cast before being cast into the casting portion 12. 1
The outer peripheral side of 3 and the threaded portion on the inner peripheral side are processed in advance, while the lid 32 is formed with male threads. In this case, it is needless to say that the screw portion does not need to be protruded outward from the cast portion, so that the end surface of the cast portion opposite to the claw portion and the end surface of the cylindrical member opposite to the claw portion side are required. Can be flush.

[0021]

As described in detail above, according to the disc brake of the present invention, when machining the through hole of the caliper after casting, the thread portion is already formed in the caliper. There is no need to machine the thread. Therefore, after adopting a configuration in which the lid is provided on the caliper in order to be able to set the shape of the claw part arbitrarily,
Processing time for through holes and the like after casting can be reduced.

[Brief description of the 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 side sectional view showing a state after the casting of the caliper of the disc brake according to the embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc brake 3 Disc 4 Pad 6 Caliper 8 Connecting part 9 Piston 10 Claw part 12 Casting part 13 Cylindrical member 13a Through hole 14 Opening (other end opening) 19 Screw part 20 Opening (one end opening) 24 Cylinder part 32 lid

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-49431 (JP, A) JP-A-62-72934 (JP, A) JP-A-5-64542 (JP, U) JP-A-59-54234 4830 (JP, U) Japanese Utility Model 3-11142 (JP, U) Japanese Utility Model Utility Model 58-191437 (JP, U) Japanese Utility Model Utility Model 32962 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A caliper having a cylinder portion into which a piston is slidably fitted, a claw portion provided opposite to the cylinder portion, and a connecting portion for connecting the cylinder portion and the claw portion, and each surface of the disk. Are arranged facing each other,
The cylinder portion includes a pair of pads that are held between the piston and the claw portion and contact the disc.
In a disc brake constituted by providing a through-hole penetrating a part of the caliper on the side opposite to the claw portion and screwing a lid to the caliper to close the side opposite to the claw portion of the through-hole, A casting portion including the claw portion and the connecting portion; a through-hole provided inside the screw portion; and a screw portion for screwing the lid body at an inner peripheral portion or an outer peripheral portion of the one end opening portion; A cylindrical member cast into the casting portion with a portion facing the claw portion.