JPH05138294A - Ventilated disk and core - Google Patents

Abstract

PURPOSE:To cast a ventilated disk inserting an annular member and good damping effect. CONSTITUTION:Melt-sticking inhibitor is coated to the annular member 1 to form a film having 0.025-0.075mm thickness. The annular member 1 is concentrically arranged with a core part 4c in the core part so as to penetrate the core part 4c. At the time of casting the ventilated disk by using the core, the ventilated disk inserting the annular member 1 and good clamping effect is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilated disc and a core for casting a ventilated disc.

[0002]

2. Description of the Related Art A core for casting a ventilated disc is composed of an outer peripheral skirting board, an inner peripheral skirting board, and a core portion provided between the both skirting boards, and is concentric with the core portion. , Which is provided with an annular member penetrating the core portion (see, for example, FIG.
18-19).

[0003]

When a ventilated disc is cast using the above-mentioned core, an annular member is arranged concentrically with the disc body of the ventilated disc and penetrates through the ribs. A minute gap is formed between the annular member and the rib. When the ventilated disc vibrates, the annular member and the ribs repeat minute relative vibrations against the frictional force to convert the kinetic energy into heat energy to attenuate the vibration of the ventilated disc. is doing. However, when the minute gap width formed between the annular member and the rib is different, the damping effect is significantly different. The inventors of the present invention have conducted various experiments and arrived at the present invention, and provide a ventilated disk and a core for casting a ventilated disk having a good damping effect.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a ventilated disc provided concentrically with the disc body and having an annular member penetrating the rib, with a gap between the annular member and the rib. Is formed, and the total of the gap widths in the radial direction and the axial direction is 0.05 to 0.15 mm. Further, it is composed of an outer peripheral skirting board, an inner peripheral skirting board, and a core portion provided between the both skirting boards, and is arranged concentrically with the core portion and penetrates the core portion. In a core for casting a ventilated disc having an annular member, a thickness of the anti-welding agent is 0.025 to 0.07.
A 5 mm coating is provided on the annular member, and an anti-fusing agent is formed from an aggregate, a binder and a diluent, and the aggregate includes silicon oxide powder, graphite, alumina powder, talc powder, zircon powder. , One or more of magnesia powder is used, one or more of water glass, paste, and organic adhesive is used as the binder, and an organic solvent or water is used as the diluent. .

[0005]

By applying an anti-fusing agent to the annular member in advance to form a film having a thickness of 0.025 to 0.075 mm, the annular member is not welded to the disk body, and the film is removed. Then, a minute gap is formed between the annular member and the rib, and when the ventilated disk vibrates, the annular member and the rib repeat a minute relative vibration against the frictional force and move. Energy is converted into heat energy.

[0006]

1 and 2 show a ventilated disc and a core for casting a ventilated disc according to the present invention. In the ventilated disc, an annular member 1 is used.
Are arranged concentrically with the disk body 2 and penetrate the ribs 3 to form a minute gap between the annular member 1 and the rib 3. The gap has a thickness of 0. 025
It is formed after removing the 0.075 mm coating, and the total of the gap widths in the radial direction and the axial direction is 0.05 to 0.
It is formed to 15 mm. When the ventilated disc vibrates, the annular member 1 and the ribs 3 repeat minute relative vibrations against the frictional force, the kinetic energy is converted into thermal energy, and the vibration of the ventilated disc is damped. Occurrence is prevented.

The core for ventilated disc casting is
Outer peripheral skirting board 4a, inner peripheral skirting board 4b, and both skirting boards 4a, 4
The annular member 1 which is composed of the core portion 4c provided between b and is coated with the anti-adhesion agent to form a film having a thickness of 0.025 to 0.075 mm is arranged concentrically with the core portion 4c. And penetrates the core portion 4c. The anti-fusing agent is formed from an aggregate, a binder and a diluent, and as the aggregate, one kind or two or more kinds of silicon oxide powder, graphite, alumina powder, talc powder, zircon powder, magnesia powder is used, As the binder, one kind or two or more kinds of water glass, glue and an organic adhesive is used, and as the diluent, an organic solvent or water is used. The anti-fusing agent is applied to the annular member 1 after mixing the aggregate and the binder, and diluting with the diluent.

The disk body 2 is made of gray cast iron or the like, and the annular member 1 is made of SUS material, SS material, sintered material or the like. In addition, the core is formed of ordinary organic core sand, inorganic core sand, or the like.

After the core is placed at a predetermined position in the mold, it is poured to cast a ventilated disc. After that, the casting sand is dropped by a shot, and the disk surface 2a is cut to obtain a ventilated disk in which the annular member 1 is cast and wrapped.

Next, a specific example will be described. An anti-adhesion agent is prepared by using magnesia oxide powder as an aggregate, an organic adhesive as a binder, and an organic solvent as a diluent, and then the anti-adhesion agent is applied to the SUS430 annular member 1 to form a film. The film thickness of the annular member 1 is 0 to 0.075 m.
Several kinds up to m are produced. Then, an organic core sand core provided with the annular member 1 is placed at a predetermined position in the sand mold, and molten cast iron (FC20) is poured to cast a ventilated disc. Next, the casting sand is dropped by a shot, and the disc surface 2a is cut to obtain a ventilated disc in which the annular member 1 is cast and wrapped.

FIG. 3 shows the relationship between the film thickness of the annular member 1 and the attenuation rate of the ventilated disk. When the film thickness is 0.025 to 0.075 mm, the ventilated disk has good attenuation. It can be seen that the effect is exhibited.

[0012]

According to the present invention, a ventilated disk having a good damping effect can be obtained, and squeal that occurs during braking can be prevented. Moreover, since the annular member penetrates the inside of the vent hole, it is not forcedly cooled by the air flowing through the inside of the vent hole, the annular member is not integrally connected with the rib, and the damping function does not deteriorate.

[Brief description of drawings]

FIG. 1 is a front view of a ventilated disc according to the present invention.

FIG. 2 is a front view of a core for casting a ventilated disc according to the present invention.

FIG. 3 is a graph showing the relationship between film thickness and attenuation rate.

[Explanation of symbols]

 1 annular member 2 disk body 3 rib 4c core part

Claims (3)

[Claims] 1. A ventilated disc, which is disposed concentrically with a disc body and has an annular member penetrating a rib, wherein a gap is formed between the annular member and the rib, and the radial direction and the shaft are provided. A ventilated disc, wherein the total of the gap widths in the axial direction is 0.05 to 0.15 mm. 2. An outer peripheral skirting board, an inner peripheral skirting board, and a core portion provided between the both skirting boards, further arranged concentrically with the core portion, and the core portion. In a core for casting a ventilated disc having an annular member penetrating therethrough, a coating having a thickness of 0.025 to 0.075 mm made of a deposition inhibitor is provided on the annular member. Core for casting. 3. The ventilated disk casting core according to claim 2, wherein the anti-fusing agent is formed of an aggregate, a binder and a diluent, and the aggregate includes silicon oxide powder, graphite and alumina powder, Talc powder, zircon powder,
One or more kinds of magnesia powder are used, one or more kinds of water glass, paste, organic adhesive is used as the binder, and an organic solvent or water is used as the diluent. A core for ventilated disc casting characterized by.