Patent Application
20100283344
1. Field of the Invention
The present invention relates to an inner-rotor-type motor and, more particularly, to an inner-rotor-type motor with a bearing seat.
2. Description of the Related Art
Referring to
In general, for preventing the bearing 84 in the first recess 911 from falling into the through-hole 821 of the stator 82, the opening 914 on the top of the bearing seat 9 narrows inwards to form a shoulder 916 for cooperating with a fastener 86 to restrict the bearing 84 in the first recess 911. However, forming the shoulder 916 decreases the inner diameter of the opening 914, so the bearing 84 and circuit board 85 in the first recess 911 and the second recess 912 can be arranged only by sequentially passing through the opening 915 on the bottom of the socket 91. Besides, the apertures 913 is formed on the top of the socket 91, so the wires need to pass through the apertures 913 for entering the second recess 912, and thus causes assembly inconvenience.
With the trend toward miniaturization of the motor sizes, the conventional inner-rotor-type motor diminishes accordingly and the first recess 911 is barely enough to receive the bearing 84, so mounting the fastener 86 on the end of the shaft 831 in the first recess 911 is not easy in assembly, and thus increases the assembly difficulties. Hence, there is a need for an improvement over the conventional inner-rotor-type motor.
It is therefore the primary objective of this invention to provide an inner-rotor-type motor that improves the assembly convenience of the inner-rotor-type motor.
An inner-rotor-type motor according to the preferred teachings of the present invention includes a housing, a stator, a rotor and a bearing seat. The housing includes an assembly space. The stator is received in the assembly space. The rotor is rotatably positioned in the housing via a bearing and extends through a through-hole of the stator. The bearing seat includes a socket and couples to the assembly opening of the assembly space. A first recess is defined by an upper wall of the socket, while a second recess is defined by the said upper wall and a circumferential side wall of the socket.
Wherein a stopper is at least a part of the upper wall of the socket and arranged between the first recess and the second recess. The bearing can pass through an end of the socket and be positioned in the first recess, while a circuit board can pass through another end of the socket and be positioned in the second recess, for one to complete the assembly of the inner-rotor-type motor. Accordingly, the assembly is simplified and the assembly convenience is improved.
Wherein the socket has a plurality of slits arranged in the circumferential side wall of the socket and a plurality of coupling portions. Each one of the coupling portions is a laterally extending groove formed at the closed end of the slits. The slits and coupling portions communicate with the second recess, and thus wires of the stator are guided into the second recess through the slits of the socket. Accordingly, the assembly convenience is improved.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferable embodiments of the invention, are given by way of illustration only, since various will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
a is a partial, cross sectional view of the inner-rotor-type motor of
b is a partial, cross sectional view of the inner-rotor-type motor of
All figures are drawn for ease of explanation of the basic teachings of the present invention only; the extensions of the figures with respect to number, position, relationship, and dimensions of the parts to form the preferred embodiment will be explained or will be within the skill of the art after the following teachings of the present invention have been read and understood. Further, the exact dimensions and dimensional proportions to conform to specific force, weight, strength, and similar requirements will likewise be within the skill of the art after the following teachings of the present invention have been read and understood.
Where used in the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the terms “inner”, “outer”, “lower”, “end”, “portion”, “top”, “bottom”, “axial”, “spacing”, and similar terms are used herein, it should be understood that these terms have reference 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
In detail, the housing 1 includes an outer shell 11 and an inner shell 12. The outer shell 11 has a compartment 110 to receive the inner shell 12. The inner shell 12 is a hollow shell with an assembly space 120, a shaft hole 121 and an assembly opening 122. The shaft hole 121 and the assembly opening 122 communicate with the top and the bottom of the assembly space 120 respectively. The stator 2 with a through-hole 21 is received in the assembly space 120. The through-hole 21 has two openings on two ends thereof communicating with the shaft hole 121 and the assembly opening 122 of the inner shell 12 in alignment. The rotor 3 has a shaft 31 arranged along an axle, and the shaft 31 extends through and rotatably positioned in the through-hole 21 via a bearing 5.
Referring to
Moreover, each of the slits 414 is arranged in the circumferential side wall of the socket 41 and has an closed end forming the coupling portion 415. Specifically, in the upper wall of the socket 41, each one of the coupling portions 415 of the slits 414 is preferably a laterally extending groove formed at the closed end, with an angle between extending directions of the slit 414 and coupling portion 415. Besides, the slits 414 and the coupling portions 415 communicate with the second recess 412. The first positioning portion 416 is formed on an outer periphery of the circumferential side wall of the socket 41, while the second positioning portion 417 is formed on an inner periphery of the side wall of the socket 41 and close to the opening of the second recess 412. Besides, the first positioning portion 416 and the second positioning portion 417 are selected from stepped structures for positioning. The base 42 has a shoulder 421 and a plurality of pressing portion 422. The shoulder 421 forms an outer periphery of the base 42 while the pressing portion 422 is flexibly formed in a center of the base 42.
Referring to
Specifically, while the bearing seat 4 couples to the assembly opening 122, with the stopper 413 formed between the first recess 411 and the second recess 412, the bearing 5 designed to couple with the shaft 31 can directly pass through the opening of the first recess 411 and be positioned in the first recess 411. Further, a circuit board 6 can pass through the opening of the second recess 412 and be positioned in the second positioning portion 417 of the second recess 412. Besides, when the shaft 31 couples to the bearing 5 in the first recess 411, an end of the shaft 31 passing through the bearing leans against a side of the stopper 413. Preferably, a wear-proof plate ‘b’ mounted in the first recess leans against a side of the stopper. The wear-proof plate ‘b’ on the interface between the said end of the shaft 31 and the stopper 413 prevents the shaft 31 and the stopper 413 from wearing out during rotation.
Next, referring to
Preferably, the base 42 is selected from a metal sheet so that the pressing portion 422 of the base 42 can be bent by an external force to support the circuit board 6, for the circuit board 6 to be steadily disposed in the second recess 412. Accordingly, assembly reliability is elevated.
Accordingly, through the said design and arrangement of the first recess 411, the second recess 412, and the stopper 413 of the socket 41, the bearing 5 and the circuit board 6 can be mounted into the first and second recesses 411, 412 respectively from the opposite ends of the socket 41 (upper and lower ends) without restriction in available space and assembly order during the assembly of the inner-rotor-type motor. Also, instead of the use of a fastener or a C-ring, the socket 41 fixes the bearing 5 in the first recess 411 steadily only with the stopper 413, and the assembly is therefore simplified.
Moreover, through the slits 414 and the coupling portion 415 of the socket 41, the wires of the stator 2 can pass through the slits 414 into the second recess 412 and be positioned in the coupling portion 415, and thus the assembly convenience of the inner-rotor-type motor is improved.
Thus since the invention disclosed herein may be embodied in other specific forms without departing from the spirit or general characteristics thereof, some of which forms have been indicated, the embodiments described herein are to be considered in all respects illustrative and not restrictive. The scope of the invention is to be indicated by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.
