JPH0534327U - Split type carrier disk brake for vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] It is intended to prevent electrolytic corrosion from occurring at a joint portion of a split type caliper body of a vehicle disc brake in which a plurality of split bodies made of iron and aluminum alloy are joined to each other. [Structure] A rust preventive film 10 is applied to the surface of a split body 3 made of iron, and an anodic oxide film 9 is applied to the surface of a split body 4 made of an aluminum alloy.
A and 3b are covered with a rust preventive agent 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake caliper body used in various traveling vehicles such as motorcycles, and more specifically, to a split type disc brake for a vehicle in which a plurality of split bodies made of iron and aluminum alloy are joined to each other. Regarding the caliper body.

[0002]

[Prior Art]

 A large-sized disc brake is required to support higher vehicle speeds, and a caliper body made of a light metal such as an aluminum alloy is used for the purpose of reducing its weight. There is a problem that the rigidity is not sufficient.

[0003] Therefore, there is known a split type caliper body in which a working portion side split body made of a light metal such as an aluminum alloy and a reaction portion side split body made of iron are joined and connected to each other. When dissimilar metals are bonded to each other as described above, electric corrosion occurs on the bonding surface due to the potential difference between the two bonding surfaces.

In order to prevent this electrolytic corrosion, it is known that a plate-shaped spacer made of a non-conductor is connected to the joint surface of the two divided bodies so as to be connected (Japanese Utility Model Publication No. 50-20090, Japanese Utility Model Publication No. Sho. 62-81732).

[0005]

[Problems to be solved by the device]

 However, in the conventional split caliper body described above, water drops such as rainwater may be attached so as to connect the action portion side divided body side and the reaction portion side divided body side beyond the protruding portion of the spacer. There is a problem in that the side divided body and the reaction portion side divided body are energized to release the insulation between both divided bodies, resulting in galvanic corrosion due to the potential difference, resulting in rust or damage.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a split type caliper of a vehicle disc brake in which a plurality of split bodies made of iron and aluminum alloy are joined to each other. It is to provide a structure in which no electrical corrosion occurs at the joint in the body.

[0007]

[Means for Solving the Problems]

 The present invention relates to a split type caliper body for a vehicle disc brake in which a plurality of split bodies made of iron and an aluminum alloy are joined to each other. The structure is characterized in that the surface of the split body made of an alloy is provided with an anodic oxide coating, and in the above structure, the surface of the joint is covered with a rust preventive agent.

[0008]

[Action]

 According to this structure, the joint surfaces of the two divided bodies are covered with the rust preventive film, and no electric corrosion occurs at the joints.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

The split type caliper body 1 has a working portion side split body 3 made of aluminum alloy, which is arranged on one side of a disk rotor 2 which rotates integrally with a wheel, and a reaction portion side made of cast iron on the other side. The division body 4 is arranged, and the action portion side division body 3 and the reaction portion side division body 4 are connected by four connecting bolts 5.

The acting portion side divided body 3 is provided with a cylinder hole 7 into which the piston 6 is inserted on the disc rotor 2 side, and the reaction portion side divided body 4 is formed with a reaction force claw 8.

A anodic oxide coating 9 having a thickness of, for example, about 2 to 4 μ is applied to the surface of the acting portion side divided body 3, and a rust preventive coating 10 (eg The attached amount is about 0.16 g / cm ² . Examples of the rust preventive coating 10 include nickel plating (including electroless plating), manganese-iron phosphate coating (percurizing), zinc chromic acid polymerized coating (dacrodized), and the like.

The joint surfaces 3 a and 4 a of the acting portion side divided body 3 and the reaction portion side divided body 4 are covered with a rust preventive agent 11. Examples of the rust preventive agent 11 include acrylic resin rust preventive paints, silicone sealants, and rubber sealants.

Further, a pair of friction pads 12, 12 are arranged between the disc rotor 2 and the action portion side divided body 3 and between the disc rotor 2 and the reaction portion side divided body 4, respectively. Each of the friction pads 12 and 12 is composed of a lining 12a that comes into sliding contact with the sliding contact surface 2a of the disc rotor 2 and a back plate 12b, and is movably supported in the axial direction of the disc rotor 2.

As described above, the anodic oxide coating 9 is applied to the surface of the acting portion side divided body 3 cast from an aluminum alloy, and the rust preventive coating 10 is applied to the surface of the reaction portion side divided body 4 cast from cast iron. Since they are joined together, no galvanic corrosion occurs even if a potential difference occurs between the joining surfaces 3b and 4b. Further, since the surfaces of the joint surfaces 3b, 4b of the operating portion side divided body 3 and the reaction portion side divided body 4 which are most susceptible to galvanic corrosion are covered with the rust preventive agent 11, the two divided bodies 3, 4 are joined together. It is possible to effectively prevent the occurrence of electrolytic corrosion between the surfaces 3b and 4b.

[0016]

[Effect of the device]

 As described above, the present invention applies a rust preventive coating on the surface of the split body of the split caliper body made of iron, and anodizing the surface of the split body of aluminum alloy to join the two. As a result, it is possible to prevent the occurrence of electrolytic corrosion due to the potential difference between the joint surfaces of the two divided bodies. In addition, when the joint surface between the action part side divided body and the reaction part side divided body, which are most susceptible to electrolytic corrosion, is covered with a rust preventive agent, the joint surfaces of both divided bodies are insulated, so that electrolytic corrosion is extremely likely to occur. It can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a partially enlarged view of a caliper body showing an embodiment of the present invention.

FIG. 2 is a partially sectional plan view of a caliper body showing an embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Split type caliper body, 3 ... Action part side split body, 3a
... Bonding surface, 4 ... Reaction part side division body, 4a ... Bonding surface,
9 ... Anodized film, 10 ... Anticorrosion film, 11 ... Antirust agent

Claims (2)

[Scope of utility model registration request] 1. A split type caliper body for a vehicle disc brake, which is formed by joining a plurality of split bodies made of iron and aluminum alloy to each other, and a rust preventive coating is applied to the surface of the split body made of iron, and the aluminum is made of aluminum. A split type caliper body for a vehicle disc brake, characterized in that a split body made of an alloy has an anodic oxide coating on its surface. 2. A split caliper body for a vehicle disc brake according to claim 1, wherein the surface of the joint portion is covered with a rust preventive agent.