JPH084693A - Rotary vane fitting structure - Google Patents

Abstract

PURPOSE:To provide a rotary vane fitting structure with a cost advantage. CONSTITUTION:An approximately U-shaped reinforcing member 5 made of steel plate is pressed and fixed into the boss 4 of a rotary vane 3 or inserted therein for molding, and the approximate D-shape of a motor shaft 1 is fitted to an approximately D-shaped hole provided in the side face of the reinforcing member 5. A screw 9 is threaded to a screw hole 8a provided in the boss 4 and the end of the screw 9 is pressed against the flat portion of the motor shaft 1 to fix the rotary vane 3 to the motor shaft 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade mounting structure.

[0002]

2. Description of the Related Art A conventional rotary blade mounting structure is shown in FIG.
As shown in FIG. 3, the motor shaft 21 is provided with a flat portion 22 for preventing rotation and is formed into a substantially D-shape, while the boss portion 24 provided at the center of the rotary blade 23 made of synthetic resin is made of aluminum. The boss 25 is integrally fixed to the boss 25, and the boss 25 is formed in the center of the boss 25 in a substantially D-shaped hole having a flat portion 26 corresponding to the D-shape of the motor shaft 21. By fitting the character portions, screwing a screw 29 into a screw hole drilled from the outer peripheral surface of the boss 25 to the center, and crimping the tip of the screw 29 to the flat portion 22, the motor shaft 21 is attached. The rotary blade 23 was fixed. However, since the boss 25 is a machined product made of aluminum, there is a problem in that it is disadvantageous in terms of cost.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides a cost effective blade mounting structure for a rotary blade.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a flat portion for preventing rotation is formed on a motor shaft, and a screw hole is provided on an outer peripheral surface of a hollow cylindrical hollow boss of a rotary blade. A reinforcing member provided with a hole formed in the hollow boss in a substantially U shape and having a flat portion corresponding to the flat portion on its side surface, and a through hole corresponding to the screw hole on one side of the parallel portion Is provided, the both flat portions are aligned, a screw is screwed into the screw hole, and the tip thereof is crimped to the flat portion of the motor shaft,
The rotating blade is fixed to the motor shaft. Further, a fitting hole for fitting the reinforcing member without a gap is formed in the boss portion, and the reinforcing member is press-fitted and fixed in the fitting hole. Further, the parallel portion of the reinforcing member is characterized in that an inclined surface is formed and a locking claw protruding outward is provided. Further, the reinforcing member is provided on the boss portion by insert molding. Furthermore,
A substantially L-shaped flange is continuously formed on the reinforcing member.

[0005]

With the above-described structure, in the rotary blade mounting structure according to the present invention, the cost can be reduced by using the reinforcing member of the pressed product as compared with the use of the boss of the machined product. The rotor blade has a structurally advantageous mounting structure.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described in detail below with reference to the drawings. In FIGS. 1 and 2, 1 is a motor shaft integrally provided in a rotor of a motor, 2 is a flat portion in which the tip of the motor shaft 1 is formed in a substantially D shape, and 3 is a rotation made of synthetic resin. The blades 4, 4 are rectangular cylindrical boss portions integrally formed in the central portion of the rotary blade 3. The boss portion 4 is provided with an insertion hole through which the substantially D-shaped portion of the motor shaft 1 is inserted with substantially no gap in the center portion, and a fitting hole for press-fitting and fixing a reinforcing member to be described later. By providing a screw hole 8a penetrating from the surface to the center and screwing a screw described later, and the tip of this screw is crimped to the flat portion 2, the rotary blade 3
Is fixed to the motor shaft 1. Reference numeral 5 denotes a reinforcing member formed of a steel plate in a substantially U-shape. For example, as shown in FIG. 3, a flat portion 6 is provided on a side surface so that the substantially D-shaped portion of the motor shaft 1 can be fitted with substantially no space. A locking claw 7a having a substantially D-shaped hole and an inclined surface formed in a parallel portion is projected outward, and the reinforcing member 5 is fitted in the fitting hole by the locking claw 7a as shown in FIG. A through hole 8b that corresponds to the screw hole 8a is provided on one side of the parallel portion to prevent coming off when press-fitting and fixing. Also,
As another embodiment of the reinforcing member 5, as shown in FIG. 4, a substantially D-shaped hole having a flat portion 6 is formed on the side surface so that the substantially D-shaped portion of the motor shaft 1 is fitted with substantially no space. And a substantially L-shaped flange 7b is continuously formed on one side of the parallel portion, and a through hole 8b corresponding to the screw hole 8a is provided. As shown in FIG. It is provided by molding. Reference numeral 9 is a screw screwed into the screw hole 8a provided in the boss portion 4.

With the above structure, the substantially D-shaped portion of the motor shaft 1 is fitted in the substantially D-shaped hole of the reinforcing member 5, and the screw 9 is screwed into the screw hole 8a so that the tip of the screw 9 is fixed. The rotary vane 3 is fixed to the motor shaft 1 by pressure bonding to the flat portion 2. As a result, by using the reinforcing member 5 made of a steel plate and pressed, as compared with using a boss machined of aluminum, a cost-effective rotor blade mounting structure is obtained.

[0008]

As described above, according to the rotor blade mounting structure of the present invention, the rotor blade mounting structure has strength to reliably transmit the rotation of the motor to the rotor blade and is advantageous in terms of cost. Become.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rotary blade mounting structure according to the present invention.

FIG. 2 is a cross-sectional view of a rotary blade mounting structure according to another embodiment.

FIG. 3 is a perspective view of a reinforcing member according to the present invention.

FIG. 4 is a perspective view of a reinforcing member according to another embodiment.

FIG. 5 is a cross-sectional view of a rotary blade mounting structure according to a conventional example.

[Explanation of symbols]

 1 Motor shaft 2 Flat part of motor shaft 3 Rotor blade 4 Boss part 5 Reinforcing member 6 Flat part of reinforcing member 7a Locking claw 7b Flange 8a Screw hole 8b Through hole 9 Screw

Claims (5)

[Claims] 1. A flat portion for preventing rotation is formed on a motor shaft, while a screw hole is formed on an outer peripheral surface of a hollow cylindrical hollow boss of a rotary blade, and the hollow boss is formed in a substantially U shape. A reinforcing member having a hole having a flat portion corresponding to the flat portion on the side surface and a through hole corresponding to the screw hole on one side of the parallel portion is provided, and the flat portions are aligned, Screw a screw into the screw hole and crimp the tip to the flat part of the motor shaft,
A rotary blade mounting structure, wherein the rotary blade is fixed to the motor shaft. 2. The rotary blade according to claim 1, wherein a fitting hole for fitting the reinforcing member without a gap is formed in the boss portion, and the reinforcing member is press-fitted and fixed in the fitting hole. Mounting structure. 3. The rotary blade mounting structure according to claim 2, wherein the parallel portion of the reinforcing member is provided with a locking claw that is formed with an inclined surface and projects outward. 4. The rotor blade mounting structure according to claim 1, wherein the reinforcing member is provided on the boss portion by insert molding. 5. The rotor blade mounting structure according to claim 4, wherein a substantially L-shaped flange is continuously formed on the reinforcing member.