JPH038057Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fixing structure for a fan motor shaft of a hot air fan motor incorporated in, for example, a hot air dryer of a sanitary washing device.

(Prior art) A rotor is rotatably mounted on a shaft protruding from a bracket, a stator coil fixed to the bracket is rotated, and an impeller is rotated along with the rotation. Various types of fan motors are used, but the motor shaft fixing structure of these fan motors was conventionally
As shown in the figure, the lower end of the shaft 53 on which the rotor 52 is mounted is inserted into a small hole 51 drilled in the bracket 50, and caulked 54, or as shown in FIG. The hole of the bracket 50 is formed as a raised collar hole 55 as shown in FIG.
The shaft 53 was press-fitted into the collar-shaped hole 55.

(Problems to be Solved by the Invention) However, according to the conventional configuration, since the contact area between the shaft 53 and the bracket 50 is small, when the shaft 53 is press-fitted into the bracket 50,
If the bracket 50 is deformed, the shaft will be tilted and fixed, which will not only cause the motor to lock, but also cause
Furthermore, there was a problem in that it was easy to cause looseness during use.

The present invention was devised in view of the above-mentioned problems, and an object of the present invention is to provide a structure for fixing a fan motor shaft in a hot air fan motor without rattling or tilting of the shaft.

(Means for Solving the Problems) The fan motor shaft fixing structure of the present invention has an aluminum bush at the lower end of the shaft, which rotatably has a rotor with a plurality of impellers fixed to the outer periphery. At the same time, an annular reinforcing rib concentric with the axis is formed on the bottom plate of the cylindrical bracket that is positioned opposite to the outer periphery of the rotor and supports the stator, and is attached to the axis of the cylindrical bracket. After the bush is semi-fitted and inserted into the circular hole drilled in the bracket, it is caulked by applying strong pressure from both sides, and the fan motor shaft is erected in the mounting bracket.

(Function) That is, in the present invention, by installing the shaft upright on the mounting mount via an aluminum bush,
Since the contact area between the shaft side and the bearing side is greatly increased, even if an external force is applied to the shaft, the shaft is less likely to tilt, and maintains perpendicularity to the mounting bracket.
Since it has a structure in which an annular reinforcing rib is formed on the cylindrical bracket, deformation of the shaft mounting portion is less likely to occur.

(Embodiment) An embodiment of the fan motor shaft fixing structure according to the present invention will be described below with reference to the drawings.

Figure 1 is a front sectional view of the fan motor, and the second
The figure is an exploded view of the same essential parts. A rotor 1 is rotatably attached to the shaft 2 via ball bearings 3, 3, and the rotor 1 includes a stator coil 5 fixed to the inner periphery of the upper end of the cylindrical bracket 4. The shaft 2 is erected on the axial center of the cylindrical bracket 4 and on the mounting bracket 7 via an aluminum bush 6 so as to rotate slightly apart from the inner diameter part. The bush 6 has its outer periphery half-fitted into the circular holes 8 and 9 of the cylindrical bracket 4 and the mounting bracket 7, and is pressed strongly from both sides with the lower end of the shaft 2 inserted into the shaft hole 11. , shaft hole 11 and shaft 2
At the same time, the circular holes 8, 9 of both brackets 4, 7 are inserted into the circumferential groove 10 formed on the outer periphery.
It is made by clamping and fixing the parts. Reference numeral 12 designates an annular reinforcing rib formed in the bottom of the cylindrical bracket 4 to bulge in a circular shape around the outer periphery of the circular hole 8. A plurality of impellers 13 extending around the outer periphery of the stator coil 5 are fixed to the rotor 1 coaxially with the shaft 2, and power is supplied to the stator coil 5 via a lead wire 14.

In the fan motor having the above configuration, one end of the shaft 2 is caulked and fixed to both the brackets 4 and 7 via the bush 6, so that the circular holes 8 and 9 of the brackets 4 and 7 and the circumferential groove 10 of the bush 6 are connected. The joint area between the shaft hole 11 of the bushing 6 and the outer periphery of the shaft 2 becomes relatively large, and the verticality maintaining force of the shaft 2 with respect to both brackets 4 and 7 becomes large. Due to the rib 12, there is almost no deformation of the mounting surfaces of both brackets 4 and 7 during caulking, and the shaft 2
is not installed on an incline.

(Effect of the invention) Since the fan motor shaft fixing structure according to the invention is configured as described above, the shaft supporting the rotor and the impeller can be vertically erected with respect to the bracket, and it can be easily fixed by external force. I don't tend to lean towards it. Therefore, it has the feature that it can be used stably for a long time without causing problems such as rattling or locking.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a fan motor showing an embodiment of the present invention, Fig. 2 is an exploded view of the same, and Figs. 3 and 4 are sectional views of main parts, respectively, showing a conventional shaft fixing structure. be. 2...shaft, 4...cylindrical bracket, 6...
...Button, 10...Peripheral groove, 11...Shaft hole, 12
...Annular reinforcement rib.

Claims (1)

[Scope of utility model registration request] In a shaft that rotatably supports a rotor having a plurality of impellers fixed to its outer periphery, a bushing is inserted into the lower end of the shaft, and the bushing is inserted into a circular hole bored in an upright part of the shaft. The above-mentioned bushing is inserted into a circular hole of a bracket formed with a bulging annular rib concentrically with the shaft, the bushing is deformed under strong pressure from both sides, and the shaft and the bracket are fixed together by caulking through the bushing. A fan motor shaft fixed structure featuring: