JPS63310343A - Motor cooling fan housing - Google Patents

Abstract

PURPOSE:To reduce noise caused by resonance, by integrally moulding with an engineering plastic material a finger guard section with small grille space for danger protection, a fan holding section and a housing section. CONSTITUTION:A fan driving motor 16 fitted with a fan 18 is secured to a fan holding section 10 in the center of the motor with a screw member 22. This fan holding section 10 in the center encloses an fan 18 through a finger guard 11 having a thick spoke member 26 and a thin grilled rib member 12, and is of such a constitution as is integrally injection-moulded with an engineering plastic material together with an outside circumferential housing 14 forming a cooling air passage. In this structure, on account of material characteristic and reduction of member parts, the noise caused by resonance by rotating vibration of the fan or the cooled motor can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fan housing that houses and holds a fan that is attached to the rear end of a motor to cool the motor.

[Conventional technology and problems]

Conventionally, die-cast aluminum has been used for a fan housing that houses and holds a fan for cooling a motor such as a spindle motor, especially from the viewpoint of structural strength. However, in a fan housing made of aluminum die-casting, a resonance phenomenon occurs due to the rotational vibration of the fan or the motor to be cooled, resulting in a high-pitched metallic sound, which is a cause of noise.

Therefore, in order to solve these problems, it is an object of the present invention to provide a fan housing that reduces noise as much as possible without reducing structural strength.

[Means for solving problems]

In view of the above object, the present invention provides a fan housing that accommodates and holds a fan attached to the rear end of a motor to cool the motor, comprising a finger guard part with a small grid interval for safety prevention and a fan holding part. Provided is a motor cooling fan housing characterized in that a housing part and a housing part are integrally molded from an engineering plastic material.

[Effect]

Since the finger guard part is integrally molded with other parts, the lattice member of the finger guard and the fan holding part in the center have a structure that reinforces the outer housing part, which overcomes the lack of strength of engineering plastic materials. It is supplemented from above.

Furthermore, since it is made of plastic material, the resonance sound is low and small.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings. FIG. 1 is a partial front view of a motor cooling fan housing according to the present invention as seen from the rear, and FIG. 2 is a longitudinal sectional view taken along the arrow line ■--■ in FIG. Referring to both figures, the fan drive motor 16 to which the fan 18 is attached is fixed to the fan holding part 10 in the center by a screw member 22. The fan holding part 10 in the center accommodates the fan 18 via the finger guard 11 having thick spoke members 26 and thin lattice-like rib members 12, and has an outer peripheral part that forms a cooling air flow path. The housing portion 14 is integrally injection molded with an engineering plastic material (eg, polybutylene terephthalate). This finger guard 1
1 is a part (component) required for safety measures to prevent workers from accidentally inserting their fingers while the cooling fan is rotating, and in the present invention, this finger guard 1
1, the lattice members 12 having small intervals between them are integrally molded with the outer housing part 14 and the fan holding part 10 in the center so that the lattice members 12 have a function as reinforcing ribs.

This integrally molded motor cooling fin housing is
The fan drive motor 16 is attached to the rear end of the motor to be cooled via a screw receiving part 24 so that the rotation axis of the motor to be cooled and the rotation axis of the fan drive motor 16 are substantially straight. Reference numeral 20 indicates a power supply cable to the fan drive motor 16.

〔Effect of the invention〕

As mentioned above, changing the motor cooling fan housing from aluminum die-casting to an engineering plastic material and integrally molding the finger guard will reduce the resonance caused by the rotational vibration of the fan or the cooled motor due to the material properties and the reduction in the number of parts. This results in reduced noise and weight reduction. In this case, the grid member of the finger guard acts as a reinforcing rib member, thereby supplementing the structural strength of the motor cooling housing. Furthermore, since the desired color can be obtained by mixing a pigment material into the material during injection molding, there is no need for conventional painting operations.

[Brief explanation of drawings]

FIG. 1 is a partial front view of the motor cooling fan housing according to the present invention, seen from the rear, and FIG. 2 is the arrow line in FIG.
Longitudinal cross-sectional view according to ■. DESCRIPTION OF SYMBOLS 10... Fan holding part, 11... Finger guard, 12... Grid member, 14... Housing part,
16...Fan drive motor, 18...Fan. Leaf figure 1 figure 2

Claims (1)

[Claims] 1. A fan housing that accommodates and holds a fan that is attached to the rear end of the motor to cool the motor, in which the finger guard part with a small lattice interval for safety prevention, the fan holding part, and the housing part are made of engineering plastic. A motor cooling fan housing characterized by being integrally molded from a material.