192 clutches and power-stop control – Clutches – Automatic
Reexamination Certificate
2001-07-16
2002-11-19
Rodriguez, Saul (Department: 3681)
192 clutches and power-stop control
Clutches
Automatic
C310S078000
Reexamination Certificate
active
06481550
ABSTRACT:
CROSS REFERENCE RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application No. 2000-224045 filed on Jul. 25, 2000 and Japanese Patent Application No. 2000-228842 filed on Jul. 28, 2000.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor having a clutch.
2. Description of Related Art
FIGS. 9
to
11
show one previously proposed motor used, for example, in a power window system. As shown in
FIG. 9
, the motor includes an oblate motor main body
82
, an oblate output unit
84
and a clutch
85
(FIGS.
10
and
11
). The motor main body
82
includes a rotatable shaft
81
. The output unit
84
includes a worm shaft
83
. The clutch
85
transmits rotation of the rotatable shaft
81
to the worm shaft
83
but prevents transmission of rotation of the worm shaft
83
to the rotatable shaft
81
.
As shown in
FIG. 10
, the clutch
85
includes a driving-side rotator
86
, a driven-side rotator
87
, a collar
89
and rolling elements
90
. The driving-side rotator
86
is secured to a distal end of the rotatable shaft
81
. The driven-side rotator
87
is secured to a base end of the worm shaft
83
. The collar
89
is secured to a gear housing
88
of the output unit
84
to surround both the driving-side rotator
86
and the driven-side rotator
87
. The rolling elements
90
are arranged between the driven-side rotator
87
and the collar
89
.
An annular recess
86
a
having diametrically opposing flat inner surfaces is formed in the axial center of the driving-side rotator
86
. An annular protrusion
81
a
having diametrically opposing flat outer surfaces formed in the distal end of the rotatable shaft
81
is fitted within the annular recess
86
a,
so that the rotatable shaft
81
is connected to the driving-side rotator
86
to rotate integrally with the driving-side rotor
86
.
On a worm shaft
83
side of the driving-side rotator
86
, protrusions
86
b
are arranged at predetermined angular positions at radially outward region of the driving-side rotator
86
. Each protrusion
86
b
extends outwardly in a radial direction and also extends toward the worm shaft
83
side in an axial direction. A plurality of recesses
87
a
are formed at predetermined angular positions at a radially outward region of the driven-side rotator
87
. A radially inward portion (where a rubber component G is arranged) of each protrusion
86
b
is received within the corresponding recess
87
a
of the driven-side rotator
87
in such a manner that a predetermined circumferential space is provided between each protrusion
86
b
and the corresponding recess
87
a.
Control surfaces
87
b
are provided in radially outer surfaces of protruded portions of the driven-side rotator
87
that are formed between the recesses
87
a.
A radial space between an inner peripheral surface of a cylindrical portion
89
a
of the collar
89
and each control surface
87
b
varies in a circumferential direction. Each rolling element
90
is arranged between the corresponding control surface
87
b
and the cylindrical portion
89
a.
An annular disk portion
89
b
that extends radially inwardly is formed at one end (upper end in
FIG. 10
) of the cylindrical portion
89
a
of the collar
89
. An annular cover plate
91
is fitted within the other end (lower end in
FIG. 10
) of the cylindrical portion
89
a.
The cover plate
91
and the annular disk portion
89
b
limit axial movement of the driving-side rotator
86
, the driven-side rotator
87
and the rolling elements
90
. That is, in order to hold the protrusions
86
b
of the driving-side rotator
86
and the rolling elements
90
within the collar
89
, an inner diameter of a central opening of the disk portion
89
b
is selected in such a manner that the disk portion
89
b
prevents the protrusions
86
b
and the rolling elements
90
to pass through the central opening of the disk portion
89
b.
The other end of the cylindrical portion
89
a
(lower end in
FIG. 10
) is securely fitted within a serrated annular groove
88
a
formed in the gear housing
88
.
In the motor having the above structure, the driven-side rotator
87
, to which the driving-side rotator
86
, the rolling elements
90
and the worm shaft
83
are mounted, is received within the collar
89
. Then, the cover plate
91
is fitted within the collar
89
to hold the driving-side rotator
86
, the rolling elements
90
and the driven-side rotator
87
within the collar
89
. Next, the worm shaft
83
is received within a worm-shaft receiving recess
88
b
of the gear housing
88
.
Thereafter, a yoke
92
of the motor main body
82
is connected to the gear housing
88
of the output unit
84
, and the protrusion
81
a
is fitted within the recess
86
a
to secure the rotatable shaft
81
to the driving-side rotator
86
.
In the clutch
85
, when the motor main body
82
is driven to rotate the rotatable shaft
81
and thereby the driving-side rotator
86
, each rolling element
90
is pushed by a radially outward portion of the corresponding protrusion
86
b,
and a wall surface of each recess
87
a
of the driven-side rotator
87
is pushed by a radially inward portion of the corresponding protrusion
86
b.
As a result, the driving-side rotator
87
and the worm shaft
83
are rotated together.
On the other hand, in a non-actuated state of the motor main body
82
, if the driven-side rotator
87
is forcefully rotated along with the worm shaft
83
, each rolling element
90
is soon clamped between the corresponding control surface
87
b
and the inner peripheral surface of the collar
89
to prevent further rotation of the driven-side rotator
87
(locked state), as shown in FIG.
11
.
When each rolling element
90
is clamped between the corresponding control surface
87
b
and the inner peripheral surface of the collar
89
(locked state), a pressure is applied to the circumferential end of the corresponding control surface
87
b
from the rolling element
90
in a generally radially inward direction (direction of arrow B in FIG.
11
). When rapid rotation of the driven-side rotator
87
is abruptly locked, the circumferential end of the engaging projection
87
c
where the rolling element is located can be deformed or damaged. Furthermore, after the driven-side rotator
87
is locked multiple times, the circumferential end of the engaging projection
87
c
can be also deformed or damaged, disadvantageously decreasing durability of the clutch.
During assembly of the above-described motor, each component
86
,
87
,
90
,
91
of the clutch
85
is first installed on the collar
89
. Then, the assembled clutch
85
is installed in the gear housing
88
. Thus, the base component, on which the other components are installed, is switched from one component (collar
89
) to the other component (gear housing
88
), resulting in a change in an installing direction of the components. This causes a tedious and time consuming assembling work.
To avoid this, it is desirable to sequentially assemble each component of the clutch
85
on the gear housing
88
that acts as the base component. However, once the driven-side rotator
87
, the rolling elements
90
and the collar
89
are installed in the gear housing
88
, the driving-side rotator
86
cannot be installed within the collar
89
. This is due to the fact that the disk portion
89
b
of the collar
89
prevents the installation of the driving-side rotator
86
within the collar
89
.
SUMMARY OF THE INVENTION
The present invention addresses the above disadvantages. Thus, it is an objective of the present invention to provide a motor provided with a clutch having a structure that allows sequential assembly of the clutch on a gear housing of the motor and is capable of retaining each rolling element within a collar of the clutch upon completion of the assembly. It is another objective of the present invention to provide a motor having a clutch that can restrain deformation or damage of a driven-side rotator thereof.
To achieve the objectiv
Adachi Tadashi
Sakai Hirofumi
Torii Katsuhiko
Yamamoto Hiroaki
Yamamura Kengo
Asmo Co. Ltd.
Law Offices of David G. Posz
Rodriguez Saul
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