U.S. patent application number 11/343676 was filed with the patent office on 2007-08-16 for damping structure for a rotor assembly of a motor.
This patent application is currently assigned to Zhongshan Broad-Ocean Motor Co., Ltd.. Invention is credited to Rong-Hua Bi.
Application Number | 20070188026 11/343676 |
Document ID | / |
Family ID | 38367643 |
Filed Date | 2007-08-16 |
United States Patent
Application |
20070188026 |
Kind Code |
A1 |
Bi; Rong-Hua |
August 16, 2007 |
Damping structure for a rotor assembly of a motor
Abstract
A damping structure for a rotor assembly includes holes defined
in a rotor and in a side board respectively and damping elements
inserted into the holes of the rotor to be located between the
rotor and the side board. Each damping element is received in a
corresponding to one of the holes of the rotor and the side board
so as to absorb vibration from the rotor to the axle of the rotor
assembly.
Inventors: |
Bi; Rong-Hua; (Shalang Town,
CN) |
Correspondence
Address: |
Thomas E. Sisson;Jackson Walker, LLP
Suite 2100
112 E. Pecan
San Antonio
TX
78205
US
|
Assignee: |
Zhongshan Broad-Ocean Motor Co.,
Ltd.
|
Family ID: |
38367643 |
Appl. No.: |
11/343676 |
Filed: |
January 31, 2006 |
Current U.S.
Class: |
310/51 ;
310/261.1 |
Current CPC
Class: |
H02K 1/30 20130101; F16F
15/08 20130101 |
Class at
Publication: |
310/051 ;
310/261 |
International
Class: |
H02K 5/24 20060101
H02K005/24 |
Claims
1. A damping structure for a rotor assembly having a rotor and an
axle extending through the rotor, the damping structure comprising:
first holes adapted to be defined in the rotor; a first side board
provided on one side of the rotor and the first side board having
second holes in communication with the first holes of the rotor;
damping elements sandwiched between the first side board and the
rotor and each damping element having third holes in communication
with the first holes of the rotor; and positioning pins extending
through the second holes of the first side board, the third holes
of the damping elements and the first holes of the rotor to secure
position of the damping elements between the side board and the
rotor such that vibration caused by rotation of the rotor is
effectively reduced.
2. The damping structure as claimed in claim 1, wherein the damping
elements include a plurality of rubber sleeves respectively
inserted into a corresponding one of the first holes of the
rotor.
3. The damping structure as claimed in claim 2 further comprising a
second side board provided to sandwich the damping elements with
the rotor and being opposite to the first side board in relation to
the rotor.
4. The damping structure as claimed in claim 1 further comprising a
rubber ring interconnecting the damping elements.
5. The damping structure as claimed in claim 2 further comprising a
rubber ring interconnecting the damping elements.
6. The damping structure as claimed in claim 3 further comprising a
rubber ring interconnecting the damping elements.
7. The damping structure as claimed in claim 3, wherein a quantity
of the first holes is between 2.about.60.
8. The damping structure as claimed in claim 4, wherein a quantity
of the holes is between 2.about.60.
9. The damping structure as claimed in claim 5, wherein a quantity
of the holes is between 2.about.60.
10. The damping structure as claimed in claim 6, wherein a quantity
of the holes is between 2.about.60.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a damping structure, and
more particularly to a damping structure for a rotor assembly of a
motor so that the vibration of the rotor assembly resulted from the
high frequency resonance of current is reduced.
[0003] 2. Description of the Prior Art
[0004] A rotor assembly and an axle of a motor are two isolated
parts. When the axle is extended into the rotor assembly, there is
no connector sandwiched therebetween. Therefore, when the rotor
assembly is rotated due to the induced current from the variation
of magnetic field, the rotation of the rotor assembly is not smooth
due to the high frequency resonance of the induced current. As
such, the operation of the axle generates noises and may even cause
hazardous resonance. Adding damping elements between the rotor
assembly and the axle does do the job of reducing the noise.
However, the damping elements are complicated and expensive
[0005] To overcome the shortcomings, the present invention tends to
provide an improved damping structure to mitigate the
aforementioned problems.
SUMMARY OF THE INVENTION
[0006] The primary objective of the present invention is to provide
a damping structure for a rotor assembly of a motor to damp out the
vibration caused by the high frequency resonance of current.
[0007] In one aspect of the present invention, the damping
structure of the present invention includes multiple first holes
defined in a rotor, second holes defined through side boards
respectively mounted on opposite sides of the rotor and damping
elements sandwiched between the side board and the rotor each
damping element provided with third holes aligned with the second
holes of the side board and the first holes of the rotor so that
after the axle is extended through the side boards, the damping
elements and the rotor, positioning pins are able to extend through
the aligned first holes, second holes and the third holes to secure
engagement between the side boards and the rotor.
[0008] A further objective of the present invention is that the
damping element is a rubber ring and the third holes are defined in
the rubber ring.
[0009] Still a further objective of the present invention is that
the positioning pins are made of rubber so that the positioning
pins are able to directly extended into the aligned first holes and
the second holes to secure engagement between the rotor and the
side boards and to damp away the vibration caused by the operation
of the rotor.
[0010] Other objects, advantages and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a schematic side plan view showing parts of the
damping structure of the present invention to be applied to a rotor
assembly which has an axle extending through the damping
assembly;
[0012] FIG. 2 is a schematic cross sectional view showing the
assembly of the damping structure with the rotor assembly; and
[0013] FIG. 3 is a cross sectional view taken from line 3-3 of FIG.
2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0014] With reference to FIGS. 1 and 2, it is noted that the
damping structure in accordance with the present invention is
applied to a rotor assembly including a rotor (2) incorporated with
an axle (1) extending through the rotor (2). A side board (3) is
provided on opposite sides of the rotor (2) to secure the axle (1)
inside the rotor (2). The damping structure of the present
invention includes first holes (21) defined in the rotor (2),
second holes (31) defined in each of the side boards (3) and third
holes (61) defined in damping elements (6) which are sandwiched
between the side board (3) and the rotor (2). In addition,
positioning pins (5) are provided to extend through the side board,
the damping element (6) and the rotor (2) to secure position of the
damping elements (6) between the side board (3) and the rotor
(2).
[0015] With reference to FIG. 2, it is noted that the second holes
(31) are aligned with the third holes (61) which in turn align with
the first holes (21) such that the positioning pins (5) are able to
extend through the aligned first holes (21), the second holes (31)
and the third holes (61) to assemble the rotor assembly after the
axle (1) is first extended through the side board (3), the damping
element (6) and the rotor (2). Preferably, the damping element (6)
in this embodiment is a rubber sleeve inserted into a corresponding
one of the first holes (21) of the rotor (2). Preferably, a
quantity of the first holes is between 2.about.60. Furthermore, the
positioning pins (5) may be made of metal or rubber. When the
positioning pins (5) are made of rubber, it is noted that the
damping element (6) may be omitted.
[0016] With reference to FIG. 3, it is noted that the rubber
sleeves are interconnected via a rubber ring and the third holes
(61) are still defined in the rubber sleeves to allow the extension
of the positioning pins (5) into the rotor (2).
[0017] As a consequence of the provision of the damping structure
to the rotor assembly, it is noted that when the outer rotor (2) is
rotated and vibrated due to the high frequency resonance from the
current, because the damping structure, i.e. the rubber sleeves (6)
in the first holes (21) of the rotor (2), exists between the rotor
(2) and the side boards (3), the vibration from the rotor (2) is
effectively damped so that the force transmitted to the axle (1) is
smooth and thus noise generated by the axle (1) is effectively
reduced.
[0018] It is to be understood, however, that even though numerous
characteristics and advantages of the present invention have been
set forth in the foregoing description, together with details of
the structure and function of the invention, the disclosure is
illustrative only, and changes may be made in detail, especially in
matters of shape, size, and arrangement of parts within the
principles of the invention to the full extent indicated by the
broad general meaning of the terms in which the appended claims are
expressed.
* * * * *