JPH0596574U - Floating caliper type disc brake - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To reduce the weight and increase the rigidity of the split caliper, and at the same time, improve the workability of the fastener components of the split caliper. [Configuration] Outer caliper 10A including caliper claws
Is formed of an aluminum composite material that is a composite of aluminum and ceramic powder, and the fastener constituent member provided on the dividing surface is formed of a material such as mild steel having good workability so that the fastener constituent is formed during caliper molding. The member is cast and formed. The fastener component material 26 forms a rotation-stop flat surface so that it does not rotate at the interface with the caliper base material due to the rotational torque when the connecting bolt 14 is tightened. The distal end portion of the fastener component material 26 may be formed in a hemispherical shape so that stress concentration during braking does not occur, and a circumferential groove may be formed in the middle portion of the fastener component material 26 to prevent the fastener component material from coming off. The screw holes 16 and the like may be processed later on the cast fastener component member, or the screw holes 16 and the like may be processed in advance and the aluminum hole may be cast around the aluminum composite material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a floating caliper type disc brake, and in particular, a caliper has a pressurizing portion provided with a hydraulic cylinder mechanism and a reaction force receiving portion located on the opposite side of the disc rotor sandwiched by a caliper bridge. The present invention relates to an improvement of a disc brake having a floating caliper which is integrally connected by fasteners such as.

[0002]

[Prior Art]

 The floating caliper type disc brake has a fixed support arranged on the outer edge of the disc rotor, and the caliper is movably assembled to the disc rotor through a support mechanism including guide pins. The caliper is equipped with a pair of friction pads facing the disc rotor, and hydraulic means for causing the friction pads to perform a rotor clamping action. The braking action is performed by actuating the hydraulic means to press one of the friction pads into contact with the disk rotor and, by reaction, press the other friction pad into contact with the disk rotor by the caliper claws. At this time, the caliper is slidably guided by the guide pin and moves in the rotor axial direction. In such a floating caliper type disc brake, a structure in which the caliper body is divided into an inner side and an outer side and the divided caliper is molded with an aluminum material has recently been studied as a measure for weight reduction.

[0003]

[Problems to be solved by the device]

 However, the caliper made of aluminum or aluminum alloy has low rigidity, and the heat generated by braking causes the caliper claws to rise in temperature, resulting in a decrease in strength and proof stress. there were.

Therefore, it is conceivable to use a highly rigid material, but since the caliper has a split structure, it becomes extremely difficult to machine a nut hole or the like, which serves as a fastening means for the split calipers, on the split surface. In addition, it is often difficult to reduce the weight of high-rigidity materials.

Focusing on the above-mentioned conventional problems, the present invention is a split caliper that has rigidity in the split caliper and is excellent in workability of the fastener constituent parts of the split calipers, and can be reduced in weight. An object of the present invention is to provide a floating caliper type disc break equipped with a caliper.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a floating caliper type disc brake according to the present invention is mounted on a fixed support straddling a disc rotor, and a pressurizing unit having a hydraulic cylinder mechanism facing one side of the disc rotor. And a reaction force receiving portion facing the other surface of the disc rotor are divided by a bridge portion, and a split caliper is combined with aluminum and ceramic powder in a disc brake equipped with a floating caliper that is joined by a fastener. The molded aluminum composite material is used, and the caliper split parts are cast-molded with the aluminum composite material of the fastener component made of a material with good machinability. A flat surface was formed on the surface to prevent rotation at the interface with the aluminum composite material. It is.

[0007]

[Action]

According to the above configuration, the divided caliper is formed of the aluminum composite material, but the caliper is formed by casting the fastener component member provided in the divided portion. Therefore, since the caliper base material is aluminum, the caliper can have a sufficiently lightweight effect. At the same time, this material is an aluminum composite material that is a composite of ceramic powder (Al ₂ O ₃ , SiC, etc.), and because the composite ceramic particles are used as an abrasive, machining is difficult. Is. However, the fastener components that need to be machined are made of another material, such as carbon steel, and are molded by casting.Therefore, tapping is required even if cutting of the nut is required for the fastener. It can be easily done without sacrificing workability. Therefore, it is possible to easily process the fastening portion of the split caliper while ensuring the weight and rigidity of the caliper. In particular, when the split calipers are fastened to each other, the interface between the cast metal member and the caliper base material may have insufficient coupling force, and the cast metal member may separate and rotate. Since it prevents the rotation of the base material, the separation between the base material and the cast-molded member can be reliably prevented, and the split caliper can be integrally connected without impairing its function.

[0008]

【Example】

 Hereinafter, specific examples of the floating caliper type disc brake according to the present invention will be described in detail with reference to the drawings.

FIG. 1 and FIG. 2 show a sectional view of a floating caliper type disc brake and a partial sectional side view of a caliper portion according to an embodiment. As shown in the figure, the caliper 10 of the disc brake is mounted on a fixed support 12 so as to be movable in the axial direction of a disc rotor (not shown), and is guided and supported by a support mechanism including guide pins so as to be movable in the rotor axial direction. There is. Such a caliper 10 has a body outer 18 arranged facing the outer surface side of the disc rotor and provided with a claw portion serving as a pressurizing portion of the outer pad 16A, and a hydraulic means 20 located on the inner surface side of the rotor. It is formed by a body inner 22 and a bridge portion 24 connecting both of them and arranged so as to straddle the outer circumference of the rotor. The caliper 10 has a two-part structure composed of an outer caliper 10A and an inner caliper 10B. The outer caliper 10A is formed by integrally molding a body outer 18 and a bridge portion 24, and an inner caliper 10B composed of a body inner 22. The structure is divided. The outer caliper 10A and the inner caliper 10B are joined to each other at the dividing surfaces, and the both are configured to be integrally connected when assembled to the fixed support 12 by a fastener.

The fastener of the split caliper 10 is composed of a connecting bolt 14 and a screw hole 16 to be screwed into the connection bolt 14, and the split surface of the outer caliper 10A is provided with a screw hole 16 corresponding thereto. In the inner caliper 10B, a bolt through hole 18 reaching the divided surface is formed. Therefore, the outer caliper 10A and the inner caliper 10B are joined to each other on the split surface, the bolt 14 is inserted from the inner caliper 10B side, and the outer caliper 10A is screwed into the screw hole 16 of the outer caliper 10A to be tightened to be integrated. Is done.

Here, in the split caliper 10 configured as described above, the outer caliper 10 A, in particular, is made of an aluminum composite material for weight reduction. The outer caliper 10A is formed by a casting material (trade name: Duralcan MMC) in which SiC powder is compounded, and the inner caliper 10B is formed by a cast iron material. In the outer caliper 10A molded from such an aluminum composite material, as described above, when the screw hole 16 that is a fastener constituent member is cut, the ceramic powder used as an abrasive is compounded. Since it becomes difficult to process the outer caliper 10A, the outer caliper 10A is formed with a fastener component material 26 such as mild steel or carbon steel having good machinability on the dividing surface of the outer caliper 10A. At this time, the aluminum composite material is cast into a single unit, and the screw holes 16 are formed in the material 26 by cutting.

As shown in FIG. 3 in detail, the fastener component material 26 is formed by processing a round rod-shaped steel material, and its base end surface is first made into a smooth surface 28. The outer caliper 28 is formed in the outer caliper 10A so that the surface 28 is flush with the caliper dividing surface. From the smooth surface 28, the above-described screw hole 16 is tapped in the axial direction. In particular, in this embodiment, the anti-rotation flat portion 32 is formed on the outer surface of the material base portion 30 located on the outer periphery of the drilled portion of the screw hole 16 by two-side cutting, but it is sufficient if there is at least one surface. .. That is, two parts of the material base 30 facing each other 180 degrees in the circumferential direction are cut and removed along the axial direction, and the parallel rotation preventing flat parts 32 are formed so that the width becomes smaller than the outer diameter of the material base 30 itself. Is formed. This prevents the fastener component material 26 from separating and rotating at the interface with the caliper base material.

The tip of the fastener component material 26 is formed in a hemispherical shape, so that the hemispherical portion 34 does not form a notch that concentrates stress at the interface with the caliper substrate. ing. A circumferential groove 36 is formed in the middle portion of the material 26 so as to partition the hemispherical portion 34 side and the material base 30 on the end smooth surface 28 side. The circumferential groove 36 has a step surface 38 with the hemispherical portion 34 side formed on a surface orthogonal to the central axis of the material, and is formed in a taper shape in which the groove depth is gradually reduced toward the material base 30. This prevents the fastener constituent material 26 from being pulled out from the caliper base material in the axial direction.

Such a fastener component material 26 is arranged in the mold of the outer caliper 10A so that the smooth surface 28 is flush with the caliper dividing surface. Then, the molten aluminum composite material is poured into a mold and solidified to form an outer caliper 10A having a predetermined shape by cast-grip molding. Thus, the outer caliper 10A integrally formed with the fastener constituent material 26 is subjected to cutting processing of the screw hole 16 in the fastener constituent material 26 whose end face of the dividing surface portion is exposed to obtain a desired outer caliper 10A. It is what

The fastener component material 26 is individually cast to form a single threaded hole 16 corresponding to the number of connecting bolts 14 required, which may be machined into a plurality of threaded holes 16. It is also possible to have an elliptical cross-section structure like this.

The outer caliper 10A configured as described above joins the inner caliper 10B and the divided surfaces thereof, and the connecting bolt 14 inserted from the inner caliper 10B side is inserted into the screw hole 16 formed in the divided surface of the outer caliper 10A. They are screwed together to be integrated, and then assembled to the fixed support 12. At this time, when the connecting bolt 14 is screwed into the screw hole 16, the fastener component material 26 cast around the caliper base material tends to rotate at the interface with the caliper base material due to the tightening torque. This is because the outer caliper 10A is formed of a combination of different materials, and the metallic bond at the interface is not necessarily strong. However, in this embodiment, as described above, the parallel stop flat portion 32 is formed on the outer surface of the fastener component material 26, so that even if the tightening torque of the connecting bolt 14 acts on the interface portion, The flat portion 32 receives the shearing force at the interface portion, and effectively prevents the fastener constituent material 26 from separating and rotating from the base material.

Further, as the connecting bolt 14 is tightened, a pulling force for pulling out from the caliper base material acts on the fastener component material 26. This acting force is an intermediate portion of the fastener component material 26. The step surface 38 of the circumferential groove 36 formed in the above supports this. Therefore, the fastener constituent material 26 is mechanically prevented from separating from the caliper base material at the interface.

Further, in the disc brake, a reaction force for spreading the outer caliper 10A and the inner caliper 10B is generated by a reaction force of the pad pressing force at the time of braking, and this working force connects the dividing surfaces. It is transmitted to the bolt 14. This acting force is transmitted to the distal end portion of the fastener component material 26. In this embodiment, a hemispherical portion 34 is formed at the embedded distal end portion of the fastener component material 26 to form a notch for stress concentration. Since it is configured so that it does not exist, the stress is dispersed and the bond strength at the dividing surface can be sufficiently increased.

In such a disc brake, the outer caliper 10A is made of an aluminum composite material as a base material to reduce the overall weight and improve rigidity, and at the same time, only the fastener portion is made of a material such as mild steel. Therefore, there is no hindrance to the machining of the part requiring machinability.

In the above-described embodiment, the fastener component material 26 is directly cast-in-molded when the outer caliper 10A is formed, and then the screw hole 16 is machined. The processed material 26 that has been processed may be cast around when the outer caliper 10A is molded.

[0021]

[Effect of the device]

 As described above, according to the present invention, the split caliper is formed of an aluminum composite material in which aluminum and ceramic powder are composited, and the caliper split portion is made of a material having good machinability. The fastener component was cast-in-molded from the aluminum composite material, and the outer peripheral surface of this fastener component was formed with a flat portion for preventing rotation at the interface with the aluminum composite material. When fastening each other, even if the joining force is insufficient at the interface between the cast metal member and the caliper base material, while effectively preventing the cast gear member from rotating separately at the interface portion of the base material, Floating caliper type disc breaker equipped with a lightweight split caliper that has rigidity to the split caliper and has excellent workability of the fastener components of the split calipers. It can be a key.

[Brief description of drawings]

FIG. 1 is a sectional view of a floating caliper type disc brake according to an embodiment.

FIG. 2 is an exploded side view of a caliper.

FIG. 3 is a side view and a front view of a fastener component material.

[Explanation of symbols]

 10 caliper 10A outer caliper 10B inner caliper 12 fixed support 14 connecting bolt 16 screw hole 26 fastener component material 28 end smooth surface 30 material base 32 rotation stop flat portion 34 hemisphere portion 36 circumferential groove 38 step surface

Claims (1)

[Scope of utility model registration request] 1. A pressurizing unit, which is mounted on a fixed support across the disk rotor and faces one surface of the disk rotor and is provided with a hydraulic cylinder mechanism, and a reaction force receiving unit which faces the other surface of the disk rotor. In a disc brake equipped with a floating caliper that is divided by a bridge part while being divided by a bridge part, the divided caliper is formed of an aluminum composite material that is a composite of aluminum and ceramic powder, and the caliper division part has A fastener component made of a material having good machinability is cast-in-mold with the aluminum composite material, and the outer peripheral surface of the fastener component has a flat portion for preventing rotation at an interface with the aluminum composite material. Floating caliper type disc brake characterized by forming