U.S. patent application number 11/160466 was filed with the patent office on 2006-12-28 for motor of pneumatic tool.
This patent application is currently assigned to MIGHTY SEVEN INTERNATIONAL CO., LTD.. Invention is credited to Johnson Chang.
Application Number | 20060288864 11/160466 |
Document ID | / |
Family ID | 37565734 |
Filed Date | 2006-12-28 |
United States Patent
Application |
20060288864 |
Kind Code |
A1 |
Chang; Johnson |
December 28, 2006 |
MOTOR OF PNEUMATIC TOOL
Abstract
There is disclosed a motor of a pneumatic tool. The motor
includes a cylinder, a rotor put in the cylinder, a plurality of
leaves movable to the cylinder from the rotor in operation, a front
cover connected to a front end of the cylinder, a rear cover
connected to a rear end of the cylinder, a front pad put between
the rotor and the front cover and between the leaves and the front
cover, and a rear pad put between the rotor and the rear cover and
between the leaves and the rear cover.
Inventors: |
Chang; Johnson; (Wu-Jih
Shiang, TW) |
Correspondence
Address: |
NIKOLAI & MERSEREAU, P.A.
900 SECOND AVENUE SOUTH
SUITE 820
MINNEAPOLIS
MN
55402
US
|
Assignee: |
MIGHTY SEVEN INTERNATIONAL CO.,
LTD.
No. 70-25, Ching Wuang Road Taichung Hsien
Wu-Jih Shiang
TW
|
Family ID: |
37565734 |
Appl. No.: |
11/160466 |
Filed: |
June 24, 2005 |
Current U.S.
Class: |
92/72 |
Current CPC
Class: |
F01D 15/06 20130101;
F01D 15/067 20130101 |
Class at
Publication: |
092/072 |
International
Class: |
F01B 1/00 20060101
F01B001/00 |
Claims
1. A motor comprising: a cylinder; a rotor put in the cylinder; a
plurality of leaves movable to the cylinder from the rotor in
operation; a front cover connected to a front end of the cylinder;
a rear cover connected to a rear end of the cylinder; a front pad
for preventing the rotor and the leaves from wearing away the front
cover, wherein the front pad is harder than the front cover; and a
rear pad for preventing the rotor and the leaves from wearing away
the rear cover, wherein the rear pad is harder than the rear
cover.
2. The motor according to claim 1 wherein the front and rear pads
are made of steel.
3. The motor according to claim 2 wherein the hardness of the front
and rear pads is at least equal to HRC 60.
4. The motor according to claim 3 wherein the front and rear pads
are made of SCM steel.
5. The motor according to claim 1 wherein the front and rear covers
are made of aluminum.
Description
BACKGROUND OF INVENTION
[0001] 1. Field of Invention
[0002] The present invention relates to a pneumatic tool and, more
particularly, to a reliable and durable motor of a pneumatic
tool.
[0003] 2. Related Prior Art
[0004] A typical pneumatic tool includes a motor for driving a tool
bit and a shell for containing the motor. The motor includes a
rotor for driving the tool bit and a cylinder for containing the
rotor. Pressurized drives the rotor while going through the
cylinder
[0005] Referring to FIG. 4, a conventional motor includes a
cylinder 1, a rotor 2, several leaves 5, a front cover 3 and a rear
cover 4. The rotor 2 is put in the cylinder 1. The leaves 5 are
movable relative to the rotor 2 in radial directions. The front
cover 3 is connected to a front end of the cylinder 1. The rear
cover 4 is connected to a rear end of the cylinder 1. While going
through the cylinder 1 Pressurized air moves the leaves 5 to the
cylinder 1 and rotates the rotor 2. Thus, the space in the cylinder
1 is divided into several sub-spaces. To ensure the operation of
the motor, the sub-spaces must be separated from one another. To
this end, the rotor 2 must contact the covers 3 and 4, and the
leaves 5 must contact the cylinder 1 and the covers 3 and 4. To
stand the long-term heavy-duty operation, the rotor 2 and the
leaves 5 are made of hard materials. The cylinder 1 and the covers
3 and 4 are made of soft materials. The rotor 2 wears away the
covers 3 and 4, and the leaves 5 wear away the cylinder 1 and the
covers 3 and 4. Enlargement of the internal diameter of the
cylinder 1 for the wear against the leaves 5 is compensated by the
radial movement of the leaves 5; however, enlargement of the axial
dimension of the space in the cylinder 1 for the wear against the
rotor 2 and the leaves 5 is not compensated. In such a case, the
sub-spaces are not separated from one another so that the motor
cannot operate normally.
[0006] There is disclosed a motor of a pneumatic tool. The motor
includes a cylinder, a rotor put in the cylinder, a plurality of
leaves movable to the cylinder from the rotor in operation, a front
cover connected to a front end of the cylinder, a rear cover
connected to a rear end of the cylinder, a front pad put between
the rotor and the front cover and between the leaves and the front
cover, and a rear pad put between the rotor and the rear cover and
between the leaves and the rear cover.
[0007] The primary advantage of the motor of the present invention
is to prevent wear of the front and rear covers because of the use
of the front and rear pads.
[0008] The present invention is therefore intended to obviate or at
least alleviate the problems encountered in prior art.
SUMMARY OF INVENTION
[0009] According to the present invention,
[0010] The primary advantage of the motor according to the present
invention is.
[0011] Other advantages and novel features of the invention will
become more apparent from the following detailed description in
conjunction with the drawings.
BRIEF DESCRIPTION OF DRAWINGS
[0012] The present invention will be described through detailed
description of the preferred embodiment referring to the
drawings.
[0013] FIG. 1 is a perspective view of a motor of a pneumatic tool
according to the preferred embodiment of the present invention.
[0014] FIG. 2 is an exploded view of the motor shown in FIG. 1.
[0015] FIG. 3 is a cross-sectional view of the motor shown in FIG.
1.
[0016] FIG. 4 is a cross-sectional view of a conventional
motor.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
[0017] Referring to FIG. 1, there is shown a motor of a pneumatic
tool according to the preferred embodiment of the present
invention.
[0018] Referring to FIGS. 1 and 2, the motor includes a cylinder
10, a rotor 20, several leaves 22, a front pad 50, a rear pad 51, a
front cover 30 and a rear cover 40. The rotor 20 is put in the
cylinder 10. The leaves 22 are movable relative to the rotor 20.
The front pad 50 is put between a front end of the rotor 20 and the
front cover 30. Moreover, the front pad 50 is put between front
ends of the leaves 22 and the front cover 30. The front cover 30 is
connected to a front end of the cylinder 10. The rear pad 51 is put
between a rear end of the rotor 20 and the rear cover 40. Moreover,
the rear pad 51 is put between rear ends of the leaves 22 and the
rear cover 40. The rear cover 40 is connected to a rear end of the
cylinder 10.
[0019] The cylinder 10 eccentrically defines a space 11, two ports
12 and 13, a series of ports 16, and a tunnel 14. The ports 12, 13
and 16 will not be described in detail for not being the spirit of
the present invention. The tunnel 14 is separated from the space
11.
[0020] The rotor 20 defines several grooves 21 in the periphery
thereof. Each groove 21 receives a leaf 22. Thus, the leaves 22 are
movable relative to the rotor 20. The leaves 22 move to the wall of
the space 11 in operation. To stand the long-term heavy-duty
operation, the leaves 22 are made of a hard material.
[0021] As mentioned above and shown in FIG. 3, the front pad 50 is
put between a front end of the rotor 20 and the front cover 30 and
between front ends of the leaves 22 and the front cover 30. That
is, the front pad 50 keeps the rotor 20 and the leaves 22 from the
front cover 30. Thus, the front pad 50 prevents the rotor 20 and
the leaves 22 from wearing away the front cover 30.
[0022] The rear pad 51 is put between a rear end of the rotor 20
and the rear cover 40 and between rear ends of the leaves 22 and
the rear cover 40. That is, the rear pad 51 keeps the rotor 20 and
the leaves 22 from the rear cover 40. Thus, the rear pad 51
prevents the rotor 20 and the leaves 22 from wearing away the rear
cover 40.
[0023] The pads 50 and 51 may be made of SCM21 or SCM415 steel so
that the hardness thereof is above HRC60.
[0024] The covers 30 and 40 may be made of aluminum in order to
minimize the weight.
[0025] The motor of the present invention is advantageous in
several aspects. Firstly, wear of the covers 30 and 40 is prevented
because of the use of the pads 50 and 51. Secondly, the normal
operation of the motor is ensured because enlargement of the axial
dimension of the space 11 is avoided due to the use of the pads 50
and 51 with the hardness higher than HRC60. Thirdly, the weight of
the motor is minimized for the use of the aluminum covers 30 and
40.
[0026] The present invention has been described through the
detailed description of the preferred embodiment. Those skilled in
the art can derive variations from the preferred embodiment without
departing from the scope of the present invention. The preferred
embodiment shall not limit the scope of the present invention
defined in the claims.
* * * * *