Starter

Details Starter Starter

1999-12-02

2001-05-01

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S088000, C310S071000, C310S239000, C310S249000, C290S048000

Reexamination Certificate

active

06225718

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a starter for starting an engine.
2. Description of the Prior Art
FIG. 14
is a sectional view showing one example of a conventional starter that was disclosed in Japanese Published Unexamined Patent Application No. 266933/1998.
In
FIG. 14
,
1
A is an output shaft. An electromagnetic switch
2
A, an over-running clutch
30
A provided with a pinion
30
P which meshes with a ring gear
50
A, a plunger
40
A comprising an inner plunger
4
A and an outer plunger
4
B are arranged on the same shaft as the output shaft
1
A. A starter with this structure is generally called a coaxial type starter.
12
A is an armature of a DC motor and
16
A is a shaft (a motor shaft).
18
A is a reduction mechanism which reduces the rotational force of the shaft
16
A and transmits it to the output shaft
1
A.
8
A is a contact shaft supported by an inner gear
17
A of the reduction mechanism
18
A almost parallel with the plunger
40
A through a supporting hole
17
m.
100
is a bracket and
800
is a shift plate which connects the plunger outer
4
B with the contact shaft
8
A.
Further, the upper side from the center axis in
FIG. 14
shows the state of a starter not in operation and the lower side shows the state wherein the starter is in operation with an electromagnetic switch turned ON and the pinion meshed with the ring gear.
Next, the operation of the starter is explained.
First, when an ignition switch is turned ON and current flows to an exciting coil
2
B of the electromagnetic switch
2
A, the outer plunger
4
B is attracted by an exciting core
2
C of the electromagnetic switch
2
A. This conventional starter has such a structure that the outer plunger
4
B is directly connected with the contact shaft
8
A via the shift plate
800
and when the outer plunger
4
B is attracted by the exciting coil
2
B, the contact shaft
8
A is also moved simultaneously. Between the outer plunger
4
B and the inner plunger
4
A, there is a coil spring
401
mounted on a spring bracket
400
and the inner plunger
4
A is kept in the stationary state because the coil spring
401
deflects at the initial stage even when the outer plunger
4
B is attracted and begins to move. In front of the inner plunger
4
A, an inner clutch
30
B is mounted via a shifter member
402
and as long as the inner plunger
4
A is kept in the stationary state, the inner clutch
30
B is also kept in the stationary state. After a short interval when the plunger
4
B is attracted and begins to move, a movable contact
80
A mounted on the contact shaft
8
A comes into contact with a stationary contact
80
B mounted in a contact chamber ZA. When the movable contact
80
A is brought into contact with the stationary contact
80
B, electric power is supplied from an external power source via a contact bolt
11
A, and an armature
12
A begins to turn. When the output shaft
1
A begins to turn by way of the reduction mechanism
18
A, the pinion
30
P is caused to move toward the ring gear
50
A by a thrust generated in a helical spline portion
1
B, and the threads and the thread grooves of the pinion
30
P and the ring gear
50
A agree and mesh. Thereafter, when the engine starts, the output shaft
1
A and the pinion
30
P are separated by the action of the overrunning clutch
30
A and the pinion
30
P runs idle. When the power supply to the exciting coil
2
B is stopped, the pinion
30
P is disengaged from the ring gear
50
A by return springs
403
,
404
.
However, in the case of a conventional starter disclosed in Japanese Published Unexamined Patent Application No. 266933/1998, there have been problems whereby a pigtail
42
(a lead wire) for electrical connection with a brush
43
is connected to the movable contact
80
A and whenever the contacts
80
A,
80
B are opened/closed, a repetitive stress is applied to the pigtail
42
. Also, worn powder from the brush
43
enters the contact chamber ZA because this chamber is not airtight.
Further, in the case of a conventional starter disclosed in Japanese Published Unexamined Patent Application No. 319926/1996 shown in
FIG. 15
, a contact chamber cover
45
is provided but a repetitive stress is applied to the pigtail
42
of the brush
43
similar to the case of the starter disclosed in Japanese Published Unexamined Patent Application No. 266933/1998 as the pigtail
42
is connected to the movable contact
80
A. Further, in the conventional technology shown in this
FIG. 15
, the contact chamber ZA is covered by the contact chamber cover
45
but under this contact chamber cover
45
, a space is formed for the movable contact
80
A to move and the contact chamber ZA is not kept in an airtight state. Therefore, there has been a problem whereby worn powder from the brush enters the contact chamber ZA in the same manner as with the starter shown in FIG.
14
.
SUMMARY OF THE INVENTION
The present invention was made to solve such problems as those mentioned above and its object is to provide a highly reliable starter with a structure wherein no repetitive stress is applied to the pigtail and worn powder from the brush can be prevented entering the contact chamber, thus preventing improper contact.
In the starter of the present invention comprising a first stationary contact that is electrically connected to a battery, a second stationary contact that is electrically connected to a positive brush, and a contact chamber where the electricity is sent between the first and second stationary contacts by a movable contact, a contact bracket is provided to hold the first stationary contact, and a contact chamber cover is provided to interpose and hold the second stationary contact between the contact chamber cover and the contact bracket so that the contact chamber can be kept in an airtight state.
The above and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 5065039 (1991-11-01), Isozumi et al.
patent: 5877575 (1999-03-01), Nara et al.
patent: 6157105 (2000-12-01), Kuragaki et al.
patent: 7-87682 (1996-09-01), None
patent: 8-319926 (1996-12-01), None
patent: 10-266933 (1998-10-01), None

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