JP4364713B2 - VEHICLE DISK BRAKE AND METHOD FOR FORMING ELECTRO-CORIDATION PREVENTIVE FILM USED FOR THE SAME - Google Patents

Description

The present invention relates to a vehicle disc brake and a method of forming an electrolytic corrosion prevention film used therefor, and more specifically, a vehicle disc brake in which a component made of a metal different from the caliper body is assembled to the caliper body, and a component of the vehicle disc brake The present invention relates to a method for forming an electrolytic corrosion prevention film on the surface of the film.

The disc brake for vehicles, in recent years, for the purpose of weight reduction, products made of A aluminum alloy have come to be provided For example caliper body Otaku. However, when the caliper body is made of an aluminum alloy, the parts attached to the caliper body and the bolts that are fastened and fixed to the caliper body are made of a metal having a higher potential than aluminum such as iron or its alloy (noble metal). If) is made of, cause galvanic action at the site where these dissimilar metals are in contact, there is a possibility that the problem of aluminum corrosion Shokusuru occurs.

As a method for preventing such galvanic action between dissimilar metals, there is a method of interposing an insulating washer at a site where dissimilar metals are in contact, or a surface of an iron-based member that is in contact with a member made of aluminum. For example, a method (for example, see Patent Document 1) in which an electrolytic corrosion preventing surface treatment is performed has been proposed.
JP 2002-323073 A

  Since the vehicular disc brake is installed at a part exposed to the outside, it is easily affected by rainwater and the like, and an electrolytic corrosion action is likely to occur at a part where the caliper body and a part made of a different metal come into contact with each other. For this reason, in a vehicle disc brake equipped with a caliper body made of an aluminum alloy, it is required to suppress the galvanic action at a site where different metals contact. Moreover, since the disc brake for vehicles is equipped with parts having high machining accuracy such as slide pins, the machining accuracy of these parts is impaired even when the parts are subjected to electrolytic corrosion prevention surface treatment. It is necessary to avoid that.

The present invention has been made to solve the problem of galvanic corrosion easily occurring at a site where dissimilar metals come into contact in these vehicle disc brakes. The purpose of the invention is to define a caliper body as a caliper body. When installing parts made of dissimilar metals, the car brake that has improved reliability and durability by suppressing the occurrence of galvanic action at the part where the caliper body and the part come in contact, and the galvanic corrosion prevention used for this It is in providing the formation method of a film | membrane .

In order to achieve the above object, the present invention comprises the following arrangement.
That is, in a vehicle disc brake in which a caliper body made of aluminum or an alloy thereof is assembled with a part made of a metal different from the caliper body, a resin is formed on the surface of the contact part of the part that contacts the caliper body with the caliper body. An electrolytic corrosion-preventing film comprising a base coat containing zinc flakes and a top coat containing aluminum flakes in a resin formed on the surface of the base coat is formed. , 2 μm to 100 μm in thickness.
Further, in a vehicle disc brake in which a caliper body made of aluminum or an alloy thereof is supported by a caliper bracket via a slide pin made of a metal different from the caliper body, the mounting portion of the slide pin of the caliper body and the slide pin An electrolytic corrosion-preventing film comprising a base coat containing zinc flakes in the resin and a top coat containing aluminum flakes in the resin formed on the surface of the base coat between the end surfaces. The spacer body formed on the surface of is interposed.

Further, the caliper body is used by being assembled to a caliper body of a vehicle disc brake made of aluminum or an alloy thereof. Is immersed in an electrolytic corrosion treatment solution containing zinc flakes, and after lifting the component from the electrolytic corrosion treatment solution, a baking treatment is performed to form a base coat film on the surface of the component, The part having the base coat film formed on the surface is immersed in an electrolytic corrosion prevention treatment liquid containing aluminum flakes in a resin, and after the component is pulled up from the electrolytic corrosion prevention treatment liquid, a baking treatment is performed. And a top coat film is formed on the surface of the component.
Further, in the step of forming the base coat film, the operation of immersing a part in an electrolytic corrosion prevention treatment liquid containing zinc flakes in the resin and then performing a baking treatment is performed a plurality of times. To do.
Further, in the step of forming the top coat film, the operation of immersing the part in an electrolytic corrosion preventing treatment liquid containing aluminum flakes in the resin and then performing a baking treatment is repeated a plurality of times. And

According to the vehicle disc brake and a method of forming the galvanic corrosion preventing film used therein according to the present invention, the caliper body made of aluminum or its alloys, and key Yaripabodi when assembling the parts made of different metals and the caliper body It is possible to prevent galvanic action from occurring between the parts .

1 and 2 show an embodiment of a vehicle disc brake according to the present invention. FIG. 1 shows a state in which the vehicle disc brake is viewed from the plane direction, and FIG.
The caliper body 10 has an action portion provided on one surface side of the disk rotor 40 and a reaction provided on the other surface side of the disk rotor 40 by the bridge portion 12 provided so as to straddle the outer peripheral edge of the disk rotor 40. The structure which connected the part is provided. The caliper body 10 is supported by a caliper bracket 20 fixed to the vehicle body. As shown in FIG. 2, the caliper bracket 20 is provided with screw holes 22 a and 22 b for fixing the caliper bracket 20 to the vehicle body, and calipers parallel to the bridge portion 12 of the caliper body 10 on both sides of the caliper bracket 20. Support arms 24a and 24b are provided.

  As shown in FIG. 1, the caliper body 10 is supported by the caliper bracket 20 by attaching the mounting arms 14 a and 14 b to the caliper support arms 24 a and 24 b of the caliper bracket 20 by bolts 18 a and 18 b. Slide pins 16 are mounted on the caliper support arms 24a and 24b, respectively, and the mounting arms 14a and 14b are slid by screwing bolts 18a and 18b into screw holes 16a provided in the slide pin 16 and tightening them. It is supported on the caliper bracket 20 via the pin 16.

  In the vehicle disc brake of this embodiment, the caliper body 10 is made of an aluminum alloy. Parts such as slide pins 16 and bolts 18a and 18b are assembled to the caliper body 10, and these slide pins 16 and bolts 18a and 18b are formed of an iron-based material. Therefore, there is a possibility that galvanic action may occur at a part where parts made of different metals from these caliper bodies 10 are assembled.

In the present embodiment, when a part made of a different metal from the caliper body 10 is assembled to the caliper body 10, as a method for preventing the galvanic action from occurring at the site where the different metal contacts, Surface treatment to prevent electrolytic corrosion was applied. Although the electrolytic corrosion preventing surface treatment can be appropriately applied to the components, the bolts 18a and 18b will be described below as an example.
In the present embodiment, the method specifically performed as the electrolytic corrosion preventing surface treatment on the surfaces of the bolts 18a and 18b includes an electrolytic corrosion preventing treatment liquid containing aluminum flakes in the resin and zinc flakes contained in the resin. This is a method of forming an electrolytic corrosion prevention film on the surface of the bolt using the electrolytic corrosion preventing treatment liquid.

That is, after removing oil adhering to the surface of the bolt and removing foreign matter adhering to the surface of the bolt by blasting, as a base coat, in the electrolytic corrosion prevention treatment liquid containing zinc flakes in the resin After the bolt is immersed in the electrolytic corrosion preventing treatment solution, a base coat film is formed on the surface of the bolt by performing a baking treatment.
Next, as a top coat, a bolt is immersed in an electrolytic corrosion prevention treatment liquid containing aluminum flakes in the resin, and after being pulled out of the electrolytic corrosion prevention treatment liquid, a baking treatment is performed to form a top coat film on the bolt surface. Form. Thereby, the bolts 18a and 18b in which the electrolytic corrosion prevention film is formed on the surface of the base material are obtained.

In addition, according to the said method, the thickness of an electrolytic corrosion prevention film | membrane can be gradually thickened by performing repeatedly the operation which immerses components in an electrolytic corrosion prevention process liquid, and bakes. The thickness of the electrolytic corrosion prevention film can also be changed depending on the concentration of flakes in the electrolytic corrosion prevention treatment liquid. When the concentration of flakes in the electrolytic corrosion prevention treatment liquid is low, the thickness of the electrolytic corrosion prevention film Becomes thinner. In order to avoid variations in the thickness of the electrolytic corrosion prevention film, it is preferable to repeatedly perform immersion and baking operations using an electrolytic corrosion prevention treatment liquid with a reduced flake concentration.
In this way, by adjusting the number of times that the electrolytic corrosion preventing film is baked or by adjusting the electrolytic corrosion preventing treatment liquid, the electrolytic corrosion preventing film can be formed to an appropriate thickness on the surface of the component. the thickness of it is desirable to adjust the range of 2Myuemu～100myuemu.

  Depending on the parts that make up the disc brakes for vehicles, there are products that require a high degree of assembly accuracy. By selecting the thickness of the anti-corrosion film according to the product, it is possible to finish the parts to the required accuracy. It becomes. In addition, a durable electrolytic corrosion preventing film can be formed by sufficiently thickening the electrolytic corrosion preventing film.

  In the vehicle disc brake of the present embodiment, the caliper body 10 is made of an aluminum alloy. Therefore, applying a top coat using an electrolytic corrosion prevention treatment liquid containing aluminum flakes means that the surfaces of the bolts 18a and 18b are made of aluminum. Since it is covered with the flakes, an effective electrolytic corrosion preventing action can be exhibited without causing an electrolytic corrosion action with the caliper body 10 made of an aluminum alloy.

As a method of performing electrolytic corrosion prevention surface treatment on the surfaces of parts such as bolts 18a and 18b assembled to the caliper body 10 made of an aluminum alloy, only electrolytic corrosion prevention surface treatment using an electrolytic corrosion prevention treatment liquid containing aluminum flakes is available. Although it is possible to (topcoat only), after forming the base coat film by using the electrolytic corrosion prevention treatment liquid containing zinc flake, facilities pre Symbol topcoat to said surface Suyo multilayer structure by to a, to improve the adhesion between the electrolytic corrosion preventing film and the substrate, it is possible to improve the durability of the galvanic corrosion preventing film.
A method for performing electrolytic corrosion prevention surface treatment parts using aluminum or electrolytic corrosion prevention treatment liquid containing zinc flakes, since it does not contain chromium as the processing liquid, thereby reducing the impact on the environment there is also and not cormorants advantage can.

  As described above, when the caliper body 10 is supported by the caliper bracket 20, the end surface of the slide pin 16 comes into contact with the mounting arms 14a and 14b of the caliper body 10 and is tightened by the bolts 18a and 18b. Since the surface of the bolts 18a and 18b is subjected to the above-described electrolytic corrosion prevention surface treatment, no electrolytic corrosion action occurs with the caliper body 10.

FIG. 3 shows the slide pin 16 and the mounting arm in order to prevent the galvanic action from occurring at the portion where the end surface of the slide pin 16 contacts and contacts the mounting arms 14a and 14b in the vehicle disc brake of this embodiment. An example of a spacer body that is mounted between 14a and 14b is shown.
FIG. 3A shows an example of a spacer cap 30 in which a spacer body is formed in a cap shape so as to shield both the end surface of the head portion 16c of the slide pin 16 and the side surface portion of the head portion 16c from the outside. The spacer cap 30 is formed with an insertion hole 30a through which the bolts 18a and 18b are inserted.

In addition, about the spacer cap 30, the electrolytic corrosion prevention surface process is given to the surface using the electrolytic corrosion prevention process liquid mentioned above. Thereby, when the spacer cap 30 is put on the head portion 16c of the slide pin 16 and the slide pin 16 is assembled to the mounting arms 14a and 14b, the electrolytic corrosion action is caused between the spacer cap 30 and the mounting arms 14a and 14b. It can be prevented from occurring.
FIG. 4 shows a state in which the spacer pin 30 is interposed between the end face of the slide pin 16 and the mounting arm 14b, and the slide pin 16 is assembled to the mounting arm 14b with the bolt 18b. Since the spacer cap 30 is interposed between the contact surfaces (contact surfaces) of the slide pin 16 and the mounting arm 14b and the side surface of the head portion 16c of the slide pin 16 is shielded by the spacer cap 30, the slide pin 16 It is possible to prevent galvanic action from occurring between the slide pin 16 and the caliper body 10 (attachment arm) including the side surface portion.

  FIG. 3B shows an example in which a circular washer 32 is used as the spacer body. Also for the circular washer 32, the surface of the base material is subjected to the electrolytic corrosion preventing surface treatment using the electrolytic corrosion preventing treatment liquid described above. Thus, when the slide pin 16 is assembled to the mounting arms 14a and 14b by interposing the circular washer 32 subjected to the electrolytic corrosion preventing surface treatment between the slide pin 16 and the mounting arms 14a and 14b, the slide pin 16 and It is possible to prevent galvanic action from occurring between the attachment arms 14a and 14b. FIG. 1 shows an example in which a circular washer 32 is mounted between the slide pin 16 and the mounting arms 14a and 14b for preventing electrolytic corrosion.

As shown in FIG. 3, the slide pin 16 is fastened to the mounting arms 14a and 14b by interposing a spacer body such as the spacer cap 30 or the circular washer 32 on the end face of the slide pin 16 facing the mounting arms 14a and 14b. In the case of this method, there is an advantage that it is possible to prevent the sliding contact pin portion 16b of the slide pin 16 from being subjected to additional treatment such as electrolytic corrosion prevention surface treatment. The sliding contact pin portion 16b of the slide pin 16 is finished with high accuracy so as to obtain the required slidability. Thus, the bolt 18a described above in the slide pin 16, as 18b, is subjected to galvanic corrosion surface treatment is not suitable equivalents.

  On the other hand, the method for preventing the electrolytic corrosion action between the slide pin 16 and the mounting arms 14a and 14b using the spacer body shown in FIG. There is also an advantage that the assembly of the vehicle disc brake can be facilitated.

In the above-described embodiment, the example in which the bolts 18a and 18b and the slide pin 16 are attached to the caliper body 10 as parts made of a metal different from the caliper body 10 has been described. Similarly, the present invention can be applied to parts made of different metals, and by forming the above-described electrolytic corrosion prevention film at the contact portion of these parts that are in contact with the caliper body 10, these parts can be applied. And the caliper body 10 can be prevented from causing an galvanic action.

1 is a plan view of an embodiment of a vehicle disc brake according to the present invention. It is explanatory drawing which shows the state which looked at the disk brake for vehicles which concerns on this invention from the axial direction of the disk rotor. It is explanatory drawing which shows the structure of a slide pin and a spacer body. It is explanatory drawing which shows the state which mounted | wore the spacer cap between the slide pin and the attachment arm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Caliper body 12 Bridge part 14a, 14b Mounting arm 16 Slide pin 16a Screw hole 16b Sliding contact pin part 16c Head part 18a, 18b Bolt 20 Caliper bracket 24a, 24b Caliper support arm 30 Spacer cap 32 Circular washer 40 Disc rotor

Claims (7)

In a vehicle disc brake in which a caliper body made of aluminum or an alloy thereof is assembled with parts made of a metal different from the caliper body,
A base coat containing zinc flakes in the resin and aluminum flakes in the resin formed on the surface of the base coat on the surface of the contact portion of the part that contacts the caliper body with the caliper body. An anti-corrosion film consisting of a top coat is formed,
The vehicle disc brake, wherein the electrolytic corrosion prevention film is formed to a thickness of 2 μm to 100 μm. In a vehicle disc brake in which a caliper body made of aluminum or an alloy thereof is supported by a caliper bracket via a slide pin made of a metal different from the caliper body,
Between the mounting part of the slide pin of the caliper body and the end surface of the slide pin,
An electrolytic corrosion prevention film comprising a base coat containing zinc flakes in the resin and a top coat containing aluminum flakes in the resin formed on the surface of the base coat was formed on the surface of the base material. A disc brake for a vehicle, wherein a spacer body is interposed.   The vehicle disc brake according to claim 2, wherein the spacer body is formed in a cap shape that covers a head portion of the slide pin.   4. The vehicle disc brake according to claim 2, wherein the electric corrosion prevention film is formed to a thickness of 2 μm to 100 μm. A caliper body is used by assembling to a caliper body of a vehicle disc brake made of aluminum or an alloy thereof, and is a method of forming an electrolytic corrosion prevention film on the surface of a component made of a different metal,
The component is dipped in an electrolytic corrosion prevention treatment liquid containing zinc flakes in a resin, and after the component is pulled up from the electrolytic corrosion prevention treatment solution, a baking treatment is performed to form a base coat film on the surface of the component Form the
Next, the component with the base coat film formed on the surface is dipped in an electrolytic corrosion preventing treatment solution containing aluminum flakes in the resin, and the component is pulled up from the electrolytic corrosion preventing treatment solution, and then baked. And forming a topcoat film on the surface of the component. A method for forming an electrolytic corrosion-preventing film for use in a vehicle disc brake. In the step of forming the base coat film, an operation of immersing a part in an electrolytic corrosion prevention treatment liquid containing zinc flakes in the resin and then performing a baking treatment is performed a plurality of times. Item 6. A method for forming an electrolytic corrosion prevention film for use in a vehicle disc brake according to Item 5. In the step of forming the topcoat film, the operation of immersing a part in an electrolytic corrosion prevention treatment liquid containing aluminum flakes in the resin and then performing a baking treatment is performed a plurality of times. The formation method of the electrolytic corrosion prevention film used for the disk brake for vehicles of Claim 5 or 6.

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