Machine element or mechanism – Engine starters – Automatic
Reexamination Certificate
1999-05-19
2001-08-14
Estremsky, Sherry (Department: 3681)
Machine element or mechanism
Engine starters
Automatic
C192S04100R
Reexamination Certificate
active
06272940
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a starting device for an electric starter motor (self starter motor) which is used as an apparatus of starting an engine, particularly, a small-sized engine.
2. Description of the Related Art
Conventionally, there has widely been known a self-motor of this kind illustrated in FIG. 19 of JP-A-2-108855. According to the self-motor disclosed in the publication, a fly wheel integrally formed with a cooing fan is attached to a crank shaft projected from an engine main body. A ring gear is attached to the outer periphery of the fly wheel. A starter motor having a length the same as a width of the engine main body is attached to a side face portion of the engine main body. A drive gear is fixed to an outer peripheral face of a drive shaft projected from the starter motor. Further, when the starter motor is driven, the drive shaft is projected out and the drive gear is brought in mesh with the ring gear to thereby rotate the crank shaft via the fly wheel. A clutch structure is constituted such that when the engine is brought into a started state in this way, the drive shaft of the starter motor is drawn to an original state and the engagement of the drive gear with the ring gear is disengaged.
As described above, according to the conventional self-motor, the engine needs to start by bringing the drive gear in mesh with the ring gear installed at the outer periphery of the fly wheel having a large diameter. Therefore, a starter motor of a style which is large-sized and is provided with large drive force is obliged to use and its fabrication cost is expensive. Further, there is constructed the constitution in which the drive gear of the drive shaft is brought in mesh with the ring gear installed at the outer periphery of the fly wheel. Therefore, there causes an inconvenience in which a dimension of a total of the engine in the diameter direction is significantly magnified since the starter motor is arranged to attach to the side face portion of the engine main body.
In order to resolve such an inconvenience, the applicant has proposed a starting device for an electric starter motor comprising a ring gear driven by two or more of small-sized motors and a clutch mechanism installed between the ring gear and an engine for starting the engine by rotating the ring gear in Japanese Patent Application No. 73381/1998.
Although the proposed starting device for an electric starter motor is effective in resolving the above-described inconvenience, there is constructed a constitution in which pairs of ring gears and motor side gears are brought in mesh with each other in parallel and accordingly, the diameter of the ring gear is obliged to magnify. Accordingly, a total of the engine integrated with the starting device cannot be expected to downsize significantly and the torque of the small-sized motor needs to increase.
Further, even when a reduction gear is interposed therebetween such that large torque is not needed in the small-sized motor, a large-sized reduction gear cannot be arranged since dimensions in a radial direction and an axial direction are restricted in view of an attachment pitch of a starter case, incorporated parts and so on.
SUMMARY OF THE INVENTION
It is an object of the invention to resolve the problem of the conventional technology and to provide a starting device for an electric starter motor capable of downsizing a small-sized motor per se without increasing torque of the small-sized motor by deceleration by gears, capable of being fabricated in a small size as a whole and inexpensively and capable of setting a reduction gear having desired dimensions without significantly changing sizes in a radial direction and in an axial direction of a total of a starter case.
In order to achieve the above-described object, according to the invention, there is provided a starting device for an electric starter motor comprising a ring gear driven by two or more of small-sized motors and a clutch mechanism installed between the ring gear and an engine for starting the engine by rotating the ring gear, wherein a reduction gear is interposed between the small-sized motors and the ring gear. Further, the reduction gear is arranged on an outer side of the ring gear.
In this way, according to the invention, the plurality of small-sized motors for the starter and the engine are operationally coupled by the ring gear and the clutch mechanism and the reduction gear is interposed between the small-sized motors and the ring gear. Therefore, the constitution is extremely simplified. Further, the plurality of small-sized motors for the starter are used and rotation of the small-sized motors is transmitted to the ring gear by the interposed reduction gear. Therefore, the torque of the small-sized motor can be set small, the used small-sized motor can be downsized, a total of the engine is downsized and dimensions in the radial direction and the axial direction needs not to magnify.
REFERENCES:
patent: 4433769 (1984-02-01), Scuccato et al.
patent: 4662233 (1987-05-01), Mazzorana
patent: 4684816 (1987-08-01), Mazzorana
patent: 5513607 (1996-05-01), Doragrip et al.
patent: 5676103 (1997-10-01), Tsunoda et al.
patent: 2-574483 (1986-06-01), None
patent: 61-112774 (1986-05-01), None
Osakabe Mitsuo
Tsunoda Shuhei
Breiner & Breiner L.L.C.
Estremsky Sherry
Lewis Tisha D.
Starting Industrial Co., Ltd.
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