Patent Application
20150176588
1. Field of the Invention
The present invention generally relates to a motor of a ceiling fan and, more particularly, to a motor receiving a plurality of bearings by a sleeve.
2. Description of the Related Art
Referring to
In the above structure, the rotor 92 of the motor 9 rotatably couples with the shaft 913 of the stator 91 via the bearings 924, and thus the shaft 913 has to couple with the bearings 924 by press fit, so as to ensure a stable rotation of the rotor 92 about the stator 91 and to avoid inner rings of the bearings 924 rotating relatively to the shaft 913. In other words, due to the press fit between the shaft 913 and bearings 924, which can only be achieved by a machine able to apply opposite pressures to the bearings 924 and shaft 913 respectively, the steps for assembly of this conventional motor 9 are complicated and time-consumptive. Besides, since the conventional motor 9 has a size large enough to operate blades of the ceiling fan, the costs of settling and maintaining said machine are usually high, and thus the manufacture cost of the conventional motor 9 is also high.
Additionally, due to the press fit between the shaft 913 and bearings 924, the vibration caused by operation of the rotor 92 can be easily and directly transmitted to the shaft 913 through the bearings 924, and thus affects electrical devices in the stator 91 or other members connecting with the shaft 913. This transmitted vibration can largely increase the failure rates of said devices and members, and decrease the lifetime of the motor 9 therefore.
As a result, Since the conventional motor 9 for the ceiling fan has drawbacks such as “complicated assembly process” and “shortened lifetime,” it is necessary to improve the conventional motor 9.
It is therefore the objective of this invention to provide a motor of a ceiling fan with first and second bearings axially clamped and thus coupling with a shaft by non-press fitting, so that this motor of the ceiling fan can be easily assembled.
Another objective of this invention is to provide a motor of a ceiling fan with a resilient member between the second bearing and a second shoulder or between the first bearing and a first shoulder for depressing the vibration generated by rotation of a rotor and reducing negative affects toward the operation of a stator or members connecting with the shaft due to said vibration, so as to prolong the lifetime of the motor of the ceiling fan.
One embodiment of the invention discloses a motor of a ceiling fan, which includes a shaft, a bearing sleeve, a limiting member, a stator and a rotor. The shaft has a first shoulder and a second shoulder. The bearing sleeve receives a first bearing and a second bearing for supporting the shaft and has an inner flange, with the inner flange and first shoulder jointly clamping and positioning the first bearing. The limiting member and second shoulder jointly clamp and position the second bearing. The stator is arranged around the shaft. The rotor couples with the bearing sleeve.
In a preferred form shown, the first bearing has an outer ring and an inner ring, the second bearing also has an outer ring and an inner ring, the bearing sleeve abuts against outer peripheries of the outer rings, and the shaft extends through and couples with the inner rings.
In the preferred form shown, the bearing sleeve has an annular wall, a first opening and a second opening, the annular wall defining a receiving space inside to receive the first and second bearings, the first and second openings are at two axial ends of the bearing sleeve and communicate with the receiving space, and the inner flange serves as the end with the first opening and extends toward the shaft from the annular wall.
In the preferred form shown, the bearing sleeve has an inner groove adjacent to and spaced from the second opening, and the limiting member is partially inserted in the inner groove.
In the preferred form shown, the limiting member abuts against the outer ring of the second bearing.
In the preferred form shown, the limiting member is connected to an axial end of the annular wall and abuts against the outer ring of the second bearing, with said axial end having the second opening.
In the preferred form shown, the inner flange abuts against the outer ring of the first bearing.
In the preferred form shown, a buffering member is arranged between the inner flange and the outer ring of the first bearing and abuts against the inner flange and first bearing by two ends respectively.
In the preferred form shown, the stator firmly mounts on the shaft, and the rotor firmly mounts on outer periphery of the annular wall of the bearing sleeve.
In another preferred form shown, a resilient member is arranged between the second bearing and the second shoulder, and abuts against the inner ring of the second bearing and the second shoulder by two ends respectively.
In said another preferred form shown, the resilient member is a spring.
In further another preferred form shown, a resilient member is arranged between the first bearing and the first shoulder, and abuts against the inner ring of the first bearing and the first shoulder by two ends respectively.
In said further another preferred form shown, the resilient member is a spring.
In still another preferred form shown, the shaft has a thick section to form the first and second shoulders at two opposite ends thereof, each of the first and second shoulders has an abutting surface, and the abutting surfaces of the first and second shoulders face away from each other.
In still another preferred form shown, the inner rings of the first and second bearings couple with the shaft by non-press fitting.
The present invention will become more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
In the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the term “first,” “second,” “third,” “fourth,” “fifth,” “inner,” “outer,” “beneath,” “above” and similar terms are used hereinafter, it should be understood that these terms refer only to the structure shown in the drawings as it would appear to a person viewing the drawings, and are utilized only to facilitate describing the invention.
Referring to
Referring to
Specifically, the first bearing 22 has an outer ring 221 and an inner ring 222, and the second bearing 23 also has an outer ring 231 and an inner ring 232, wherein each of the outer rings 221, 231 is able to rotate about a respective one of the inner rings 222, 232. The annular wall 211 of the bearing sleeve 21 abuts against outer peripheries of the outer rings 221, 231; the shaft 1 extends through and couples with the inner rings 222, 232; the abutting surface of the first shoulder 11 abuts against the inner ring 222 of the first bearing. 22; and the abutting surface of the second shoulder 12 abuts against the inner ring 232 of the second bearing 23. Furthermore, the inner flange 212 axially positions the first bearing 22 by contacting the outer ring 221 of the first bearing 22, and thus the first bearing 22 can be clamped by and stably positioned between the inner flange 212 and first shoulder 11. Similarly, the limiting member 24 axially positions the second bearing 23 by contacting the outer ring 231 of the second bearing 23, and thus the second bearing 23 can be clamped by and stably positioned between the limiting member 24 and second shoulder 12.
Please refer to
The core 31 of the stator 3 connects with a base 5 through a linking seat 32, wherein the base 5 is close to the second opening 211b and away from the first opening 211a. When this motor of the ceiling fan is in use, the shaft 1 is fixed to the ceiling with an end extending out of the bearing sleeve 21 from the first opening 211a, the base 5 is beneath and spaced from the ceiling, and the rotor 4 is arranged between the base 5 and the ceiling. With the above arrangement, the heat generated inside this motor can be easily dissipated from the area between the base 5 and the ceiling.
With the illustrated structures of the motor of the first embodiment, an assembling process for mounting the bearing module 2 onto the shaft 1 can be performed as the following. First, the first and second bearings 22, 23 of the bearing module 2 are disposed around the shaft 1 by two ends of the shaft 1 respectively. Second, the first and second bearings 22, 23 are sheathed inside the bearing sleeve 21, with the bearing sleeve 21 coupling with the outer rings 221, 231 of the bearings 22, 23 and the inner flange 212 abutting against the outer ring 221 of the first bearing 22. Finally, after the limiting member 24 couples with the bearing sleeve 21 and abuts against the outer ring 231 of the second bearing 23, the assembling process of the combination of the shaft 1 and bearing module 2 is completed. Through the above process, the first bearing 22 is firmly clamped by and positioned between the inner flange 212 and first shoulder 11, and the second bearing 23 is firmly clamped by and positioned between the second shoulder 12 and the limiting member 24. Therefore, since the first and second bearings 22, 23 are firmly positioned, the inner rings 222, 232 of the first and second bearings 22, 23 have not to couple with the shaft 1 by press fit for fixing the axial positions of the bearings 22, 23 relative to the shaft 1, and thus the assembling process of this motor is much easier in comparison to those of the conventional motors.
Now, please refer to
Additionally, in this embodiment, instead of being inserted into the inner groove 213 shown in
Referring to
Referring to
Referring to
Based on the structural features above, the characteristics of the first and second embodiments of the disclosure are listed as follows.
Specifically, a shaft 1 is coupled with a bearing module 2. The shaft 1 includes a first shoulder 11 and a second shoulder 12. The bearing module 2 includes a bearing sleeve 21. First and second bearings 22, 23 are received in the bearing sleeve 21 for supporting the shaft 1 and abutting against the first and second shoulders 11, 12 respectively. The bearing sleeve 21 further has an inner flange 212 that is used with the first opening 211a to clamp and retain the first bearing 22 therebetween. The bearing module 2 is further coupled with a limiting member 24 that is used with the second shoulder 12 to clamp and retain the second bearing 23 therebetween. Besides, a stator 3 may be arranged around the shaft 1, and a rotor 4 may be coupled to an outer periphery of the bearing sleeve 21. In this arrangement, the stator 3 and the rotor 4 are coupled with each other via the bearing module 2.
In sum, the inner rings 222, 232 of the motors of the above embodiments couple with the shaft 1 by non-press fitting, and the first and second bearings 22, 23 are still firmly positioned relatively to the shaft 1 since the inner flange 212 and first shoulder 11 axially sandwich the first bearing 22 as well as the second shoulder 12 and the limiting member 24 axially sandwich the second bearing 23. As a result, it is unnecessary to use an additional machine to apply high pressures to the shaft 1 and the first bearing 22 or second bearing 23, and thus the assembling process of these motor is easy, simple and economic. Besides, the resilient member 25 arranged between the second bearing 23 and second shoulder 12 or between the first bearing 22 and first shoulder 11 can depress the vibration generated by rotation of the rotor 4. Accordingly, the resilient member 25 avoids the vibration toward the stator 3 or members connecting with the shaft 1, efficiently lower the possibility of failure and thus prolongs the lifetime of the motors.
Although the invention has been described in detail with reference to its presently preferable embodiments, it will be understood by one of ordinary skill in the art that various modifications can be made without departing from the spirit and the scope of the invention, as set forth in the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102148019 | Dec 2013 | TW | national |
