JPH04110237U - Floating caliper type disc brake - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent a decrease in thermal strength due to braking heat generation of a caliper made of aluminum material, ensure strength and rigidity, and reduce weight. [Structure] The reaction side of the caliper, including the caliper claws, is made of aluminum composite material, and a pressing member made of cast iron material with low thermal conductivity, such as FC or FCD, is attached to the caliper claws. It is pressed against the friction pad side to prevent braking heat from being directly transmitted to the aluminum composite caliper.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a floating caliper type disc brake, and in particular the brake equipment. Floating caliper type disc brake with a structure suitable for reducing the weight of the machine. Regarding improvements to the key.

0002

[Conventional technology]

Floating caliper type disc brakes are placed on the outer edge of the disc rotor. A fixed support is provided, and the carrier is attached to the fixed support via a support mechanism including a guide pin. The rotor is assembled so that it can move in the axial direction of the disc rotor. There is a disc on the caliper. A pair of friction pads are arranged facing each other on the rotor, and the rotor is sandwiched between these friction pads. Hydraulic means for applying pressure are fitted. For braking, hydraulic means are activated. By doing so, one of the friction pads is brought into pressure contact with the disc rotor, and the reaction force is Depending on the use, the other friction pad is attached to the disc rotor by the caliper claw on the reaction side. This is done by making pressure contact, but at that time the caliper slides with the guide pin. It is guided and moves in the rotor axial direction. This kind of floating caliper type brake Recently, the caliper body of brake brakes has been changed to aluminum as a measure to reduce weight. A structure molded from aluminum material is being considered.

0003

[Problem that the idea aims to solve]

However, with caliper type disc brakes, the temperature at the caliper claws is 200°C. The temperature may reach up to 300°C, and the cap made of aluminum material The thermal strength of the reaction side of the caliper, including the ripper claws, is significantly reduced, ensuring strength and rigidity. There was a drawback that it was insufficient. Accompanying braking operations in actual disc brakes Looking at temperature changes, in the disc brake shown in Figure 9, rotor 1 and friction pad pad 2, caliper pawl portion 3, joint portions 4 and 5 of the split caliper, and cylinder of hydraulic means. FIG. 10 shows the measurement results of temperature changes using each of the test pieces 6 as measurement sites. This is multiple It shows the temperature change associated with the braking process and the subsequent cooling condition. Shown in Figure 10 As shown in the figure, when braking is performed continuously, the temperature reaches a maximum of 500°C at rotor 1, and the friction The temperature reached 380°C for the pad 2, and 290°C for the caliper claw 3. did Therefore, it can be understood that the temperature of the parts surrounding the pad, including the caliper claw part 3, has increased significantly. Wear.

0004 For this reason, the caliper was made of aluminum material to reduce weight. However, the temperature of the caliper claws increases due to the temperature rise associated with braking, and The yield strength is reduced to 1/3 of that of aluminum materials, and sufficient strength and rigidity cannot be maintained. There was a drawback that it disappeared.

[0005] In addition, the caliper claw part is made of aluminum material and is made of SUS material, and the friction pad The contact area of the attached shims is particularly exposed to electricity as the brake is a component that is exposed to the outside. Eating reactions are likely to occur, resulting in the extremely undesirable phenomenon of corrosion. There were also problems.

[0006] This invention focuses on the above-mentioned conventional problems and has developed an aluminum Compared to the caliper body made of rubber, the strength of the caliper body is reduced due to the heat generation that is inevitable as a disc brake. Floating structure with a structure that does not cause the problem of deterioration or electrolytic corrosion. The objective is to provide a caliper type disc brake.

[0007]

[Means to solve the problem]

In order to achieve the above purpose, the present invention has developed a floating caliper type disc brake. In a rake, when the reaction side of the caliper is made of aluminum composite material, In both cases, the pressing part of the caliper claw on the reaction side with the friction pad side is made of cast iron. The cast iron material is integrally formed with the cast iron material so that the friction pad can be braked and pressed through the cast iron material. It is structured as follows.

[0008]

[Effect]

According to the above configuration, the disc rotor and the friction pad come into frictional contact due to the braking action. This heat is transferred to the aluminum carrier through the pad back metal and shim. It tries to transmit to the pawl part. However, the caliper claws have pressing parts made of cast iron. A material is interposed, and this serves as a contact member with the friction pad and shim. Cast iron is very Aluminum material has low thermal conductivity and prevents heat transfer to the caliper claws. It is possible to prevent an excessive temperature rise on the caliper claw main body side. This conclusion This prevents the aluminum material from reaching temperatures that would significantly reduce its yield strength. This allows it to maintain its strength and rigidity as a brake component. Also, cast iron The material has excellent workability, so the pressing surface of the claw can be machined with high precision. Become something. Furthermore, even when SUS shims are attached to friction pads, cast iron shims Even if the pressure member is interposed between the aluminum calipers, the aluminum calipers It has the effect of preventing electrolytic corrosion of the metal.

[0009]

【Example】

The following is a concrete example of the floating caliper type disc brake according to the present invention. Examples will be described in detail with reference to the drawings.

0010 1 and 2 show cross-sectional views of a caliper-type disc brake according to an embodiment. There is. As shown in the figure, the caliper 10 of this disc brake has a fixed support 12 Fixed support that is attached to and movable in the axial direction of the disc rotor (not shown) 12, and can be moved in the rotor axial direction by a support mechanism including a guide pin. Sea urchin guide is supported. Such a caliper 10 is installed on the outer surface of the disc rotor. a claw portion (body outer) 18 which is arranged facing and to which the outer pad 16A is attached; A body inner 22 located on the inner surface of the rotor and into which the hydraulic means 20 is incorporated; It is formed by a bridge section 24 that connects the two and is arranged so as to straddle the outer circumference of the rotor. be done. In the embodiment, the caliper 10 includes an outer caliper 10A and an inner caliper 10B. The outer caliper 10A is connected to the caliper claw part 18. The inner caliper 1 consists of a body inner 22 and is formed by integrally molding a It has a structure divided into 0B. Then, outer caliper 10A and inner caliper The liper 10B is joined to each other at the split surface, and connected when assembled to the fixed support 12. They are configured to be integrally connected by a connecting bolt 14.

[0011] The caliper 10 configured as described above is made of aluminum composite material to reduce weight. In the example, SiC powder is composited into Al-Si alloy. Outer caliper 10A is made of cast material (product name: Duralcan MMC). and an inner caliper 10B made of cast iron. Aluminum like this In the caliper 10 made of a composite material, as described above, the braking Since the temperature rise associated with this is significant in the caliper claw portion 18, in the embodiment, The contact pressure surface of the pawl portion 18 to the friction pad (outer pad) 16A has low thermal conductivity. A plate-shaped pressing member 28 made of cast iron material such as FC or FCD is cast. It is attached integrally by the gurumi. That is, the caliper pawl portion 18 is shown in FIG. The pressing member 2 is formed in a bifurcated shape so that the pressing member 2 8 is attached so as to cover the entire surface in contact with the outer pad 16A. this A stepped surface is formed on the caliper pawl portion 18 for installation, and a joint surface between the two is formed. A protrusion 30 is formed on one side and a recessed part 32 is formed on the other side, and the two are cast so that they fit together. It is integrally molded to prevent it from falling off after forming. be. As a result, in the caliper pawl portion 18, cast iron material is added to the aluminum composite material of the base material. It has a structure in which a pressing member 28 is attached.

0012 Here, the aluminum composite material used as the base material has a thermal conductivity of 0.4 cal/cm・s・℃ or more. The pressing member 28 integrated with this has a smaller thermal conductivity (0.110 to 0.1 in FC). 37cal/cm・s・℃, FCD 0.08cal/cm・s・℃). Therefore, the carry In the pawl portion 18, the pressing member 28 with low thermal conductivity is directly applied to the friction pad 16A or comes into contact with the shim to perform braking action, and the heat from the friction pad 18 side is The pressing member 28 has a heat insulating function and suppresses heat transfer to the caliper claw base material side. This is possible.

[0013] With a floating caliper type disc brake configured in this way, braking When the action is performed, contact pressure occurs when the caliper claw portion 18 presses the friction pad 16A. The cast iron pressing member 28 provided on the surface presses the friction pad 16A, and the aluminum composite There is no contact between the caliper made of the material and the friction pad. For this reason, braking Heat generation is mainly caused by the pressure member 28, which has low thermal conductivity, and the friction pad 16A or shim. Heat is dissipated at the contact surface, and as a result, heat transfer to the caliper body is suppressed. It is possible to suppress the temperature rise of the aluminum composite material. Therefore, aluminum This prevents the composite caliper body from reaching temperatures that would significantly reduce its yield strength. The caliper can be used while maintaining the high strength and rigidity of aluminum composite material. This has the advantage of effectively reducing the weight of disc brakes. In this case The pressing part should be adjusted so that the temperature rise of the aluminum composite part is at most 200°C. The thickness and shape of the material 28 may be adjusted.

[0014] By the way, in a disc brake, the friction pad 16 is in partial contact with the disc rotor. Because it is necessary to prevent It is required that the In the embodiment, the pressing member 28 is made of cast metal with low thermal conductivity. Although cast iron material is used, this cast iron material also has the machinability of aluminum composite material. It is a material with significantly superior workability compared to . Therefore, the caliper claw portion 18 Cutting can be performed easily, and the press contact surface can be smoothed with high precision. It becomes. Therefore, the caliper structure is made of aluminum composite material. This allows for improved workability compared to the conventional structure.

[0015] Further, a friction pad is attached to a friction pad that is a member with which the caliper claw portion 18 comes into contact. The shim is generally made of SUS material, and the contact area is Al- Electrochemical corrosion occurs due to the presence of an electrolyte solution between the two due to the SUS relationship. So-called electrical corrosion is more likely to occur. However, in this example, cast iron material is used on the caliper side. Attach the pressing member 28 and bring it into contact with the SUS material shim 35A. Therefore, even if an electrolyte is present in the metal contact area, no potential difference is generated, preventing corrosion. can do.

[0016] Next, FIGS. 3 and 4 show cross sections of main parts of a caliper type disc brake according to the second embodiment. Show the diagram. In the above embodiment, the cast iron pressing member is formed into a flat plate shape and the outer cover is Although it was formed by casting around the liper 10A, in this example, the outer periphery of the outer pad 16A A pressing member is placed so that the cast iron member is also located on the inner surface of the bridge portion 24 facing the edge. 28A is formed into an inverted L-shape and is cast into the outer caliper 10A and integrated. This is what I did. With this configuration, the braking of the outer pad 16A is At the same time, it prevents the aluminum composite material from being heated by radiant heat from hot parts. , thereby preventing a decrease in proof strength of the outer caliper 10A. This is it If so, the heat generated by braking will be generated not only in the part that directly contacts the outer pad 16A but also in the caliper base material. As a result, the transmission of radiant heat to the aluminum composite material is suppressed, resulting in higher You can get a great effect.

[0017] 5 to 8 show the outer pad 1 with respect to the contact surface of the pressing member 28 of the first embodiment. To reduce the contact area with the 6A side and improve heat dissipation. 2A and 2B show examples in which a plurality of grooves are formed. Figures 5 and 6 show the horizontal groove 34A. Fig. 7 shows an example in which an arcuate groove 34B is formed along the rotational direction of the disc rotor. Further, FIG. 8 shows an example in which a vertical groove 34C is formed. The pressing member 28 has a low thermal conductivity. Therefore, the amount of heat generated during braking is determined by the amount of heat generated by braking between the pressing member 28 and the outer pad 16A or shim. Heat is mainly dissipated at the contact surface, but by providing the grooves 34, the heat transfer area is increased. It is smaller and heat transfer to the caliper body side of the aluminum composite material is further suppressed. At the same time, the heat radiation area is increased by the grooves 34 (34A, 34B, 34C), resulting in high radiation. It can have a thermal effect. In particular, in the examples shown in Figures 5 to 7, the display Since it follows the rotation direction of the rotor, a smooth heat dissipation air flow is generated and the heat is dissipated. The cooling effect can be further improved. Also, if the vertical groove 34C in Fig. 8 is used, the braking It also has the advantage of increasing effectiveness. Naturally, the horizontal groove 34A Alternatively, the structure may have vertical and horizontal grooves formed by a combination of arcuate grooves 34B and vertical grooves 34C. Both are possible.

[0018] In addition, according to the above embodiment, the pressing member 28 is attached to the caliper claw portion 18 by means of a casting. It has a structure in which it is integrally attached, but this is done by press-fitting or other methods. Of course, it is also possible to physically connect them.

[0019]

[Effect of the idea]

As explained above, the floating caliper type disc brake according to the present invention According to Ki, the reaction side of the caliper is made of aluminum composite material. In addition, the pressing part of the caliper claw on the reaction side with the friction pad side is made of cast iron material. It is formed more integrally and the friction pad is pressed through the cast iron material. Because of the structure, compared to the aluminum caliper body adopted for weight reduction, However, as a disc brake, the inevitable heat generation may cause the problem of reduced strength. Caliper-type disc brakes with a structure that prevents electrolytic corrosion. The effect that can be obtained is obtained.

[Brief explanation of drawings]

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

FIG. 2 is a cross-sectional view of a caliper pawl portion of the same brake.

FIG. 3 is a side sectional view of a caliper pawl portion of a caliper type disc brake according to a second embodiment.

FIG. 4 is a view taken along the line A-A of the caliper pawl portion of the same brake.

FIG. 5 is a cross-sectional view of a first modification example in which a groove is formed in the pressing member.

FIG. 6 is a front view of the pressing member of FIG. 5;

FIG. 7 is a front view of a pressing member of a second modified example in which a groove is formed in the pressing member.

FIG. 8 is a front view of a pressing member of a third modified example in which a groove is formed in the pressing member.

FIG. 9 is a sectional view of a conventional caliper type disc brake.

FIG. 10 is a measurement diagram of temperature changes associated with repeated braking and subsequent natural cooling at multiple locations in a conventional caliper-type disc brake.

[Explanation of symbols]

10 Caliper 12 Fixed support 16A outer pad 16B Inner pad 18 Caliper claw part 20 Hydraulic means 28 Pressing member 30 Convex stripe 32 Recessed part

Claims (1)

[Scope of utility model registration request] Claim 1: In a floating caliper type disc brake, the reaction side of the caliper is formed of an aluminum composite material, and the pressing part of the caliper claw of the reaction side with the friction pad side is integrally made of cast iron material. 1. A floating caliper type disc brake characterized in that a friction pad is formed to perform braking pressure through the cast iron material.