JP3063200B2 - Disc rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotor, and more particularly to a disk rotor which is lightweight, has high strength and excellent durability, and is effective for reducing the weight of a disk rotor such as a disk brake mechanism for an automobile.

[0002]

2. Description of the Related Art Conventionally, iron (cast iron) is mainly used for automobile disk rotors because of its low cost, high reliability of materials, and ease of manufacture. . By the way, recently, from the aspect of global environmental protection, there is a movement to save energy also in the field of automobiles, and as a countermeasure, weight reduction of automobile weight is a major issue. For this reason, the weight reduction of the disk rotor is also desired.

[0003]

The conventional iron-made automobile disk rotor is heavy. Easy to rust. This has a great effect on the fuel efficiency, acceleration, and inertia of an automobile, and has a disadvantage in terms of rust due to a braking force and a braking mechanism, which is contrary to energy saving.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a lightweight, high-strength, and highly durable disk rotor.

[0005]

According to a first aspect of the present invention, there is provided a disk rotor in which a two-layer coating is applied to a surface of a rotor main body made of aluminum or an aluminum alloy, and a base layer of the two-layer coating is provided.
It is a hard chromium layer having a thickness of 20 to 500 μm , and the surface layer is a titanium nitride layer.

[0006]

[0007] The disk rotor of the second aspect is the first aspect of the invention.
In the disc rotor, the thickness of the titanium nitride layer is 1
１００100 μm.

Hereinafter, the present invention will be described in detail. The main body of the disk rotor of the present invention is made of aluminum (Al), which is particularly lightweight among metal materials, and its lightweight and high-strength alloy. As the Al alloy, JIS-A-20
17 and the like.

The two-layer coating formed on such a rotor body is composed of a hard chromium (Cr) layer underlayer and a titanium nitride (TiN) layer surface layer.

[0010] hard Cr layer of the underlayer may be formed by electroplating or the like, the thickness 20 ～500Myuemu, good
Mashiku is Ru 20~200μm der. The thickness of the hard Cr layer
If the thickness is less than 20 μm, a problem due to micro cracks occurs.
If it exceeds 500 μm, the hard Cr layer is too thick, which is uneconomical.

The TiN layer as the surface layer is preferably formed by a PVD method or the like, and has a thickness of 1 to 100 μm, particularly 3 μm.
It is preferably from 30 to 30 μm. TiN layer thickness is 1
If it is less than μm, there is a risk of microcracks,
If it exceeds m, the TiN layer is too thick more than necessary and is uneconomical. In forming the TiN layer, it is preferable to previously treat the surface of the hard Cr layer by polishing or the like in order to make the surface of the hard Cr layer uniform.

[0012]

Since Al or an Al alloy is lightweight and has high strength, it is particularly effective for reducing the weight of a disk rotor.

Further, by applying a two-layer coating of a hard Cr layer and a TiN layer on the surface of such Al or Al alloy, it is possible to achieve high strength, wear resistance and corrosion resistance. That is, the TiN layer is hard and hard to be damaged, but when directly coated on the base material Al or Al alloy, the surface strength of the base material Al or Al alloy is insufficient, so that the coating is not performed. The effect due to is not fully exhibited. On the other hand, by forming the base layer of the hard Cr layer and then forming the TiN layer, the TiN layer is strongly bonded to the base material via the hard Cr layer using the hard Cr layer as a medium. In addition, since the surface of the hard Cr layer is smooth,
The TiN layer is uniformly coated without unevenness in thickness,
The iN original characteristics are fully exhibited. For these reasons, a disk rotor coated with a two-layer coating of a hard Cr layer and a TiN layer is extremely excellent in mechanical properties such as strength, hardness, abrasion resistance, friction performance, and corrosion resistance.

According to the disk rotor of the present invention, the weight is reduced to 1/2 to 1/1 compared to the conventional iron disk rotor.
3 and very light. Therefore, fuel efficiency is improved.
As it does not rust like a conventional iron disc rotor,
No problem with the braking mechanism. Hardness of the rotor surface is higher than that of an iron disk rotor, and the rotor is not scratched by deposits or the like. For this reason,
The coefficient of friction is stable. The influence of the material on the disk pad side is small. Therefore, the life of the pad material can be extended. Since it has a yellow color or a color close thereto, it is also excellent in terms of design and decorativeness. And the like.

[0015]

The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples unless it exceeds the gist.

Examples 1-4, Comparative Example 1 An underlayer of a hard Cr layer having a thickness shown in Table 1 was formed on a disk rotor body made of an Al alloy (JIS-A-2017) by ordinary electroplating. After performing polishing to make the surface of the underlayer uniform, a surface layer of a TiN layer having a thickness shown in Table 1 was formed on the surface by a PVD method. The operating conditions for electroplating and PVD were set within the range of the conditions usually performed. The obtained disk rotor was subjected to a performance test and compared with a conventional cast iron disk rotor (Comparative Example 1). Table 1 shows the results.

[0017]

[Table 1]

According to Table 1, the disk rotor of the present invention is:
The coefficient of friction shows almost the same good value as the conventional cast iron disk rotor, and the wear resistance is good, and because of its high hardness, the scratch resistance and durability are better than those of the cast iron disk rotor. It is clear that it is significantly better. Moreover, the disk rotor of the present invention was very light, 1/2 to 1/3 the weight of the conventional cast iron disk rotor.

[0019]

As described in detail above, according to the disk rotor of the present invention, a disk rotor which is excellent in friction performance, abrasion resistance, mechanical strength, corrosion resistance and durability, high in hardness and very lightweight is provided. Is done. INDUSTRIAL APPLICABILITY The disc rotor of the present invention can be used for a disc brake mechanism for automobiles and the like, and can be reduced in weight, and is industrially extremely useful.

────────────────────────────────────────────────── ─── Continued on the front page (56) References JP-A-60-205031 (JP, A) JP-A-2-142926 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 65/12 C23C 28/00

Claims (2)

(57) [Claims] 1. A disk rotor comprising a rotor body made of aluminum or an aluminum alloy and a two-layer coating applied to a surface of the rotor body, wherein an underlayer of the two-layer coating is a hard chromium layer having a thickness of 20 to 500 μm. A disk rotor, wherein the layer is a titanium nitride layer. 2. The disk rotor according to claim 1, wherein the thickness of the titanium nitride layer is 1 to 100 μm.