Electricity: circuit makers and breakers – Gear driven
Reexamination Certificate
2002-07-30
2003-08-26
Donovan, Lincoln (Department: 2832)
Electricity: circuit makers and breakers
Gear driven
C192S043100
Reexamination Certificate
active
06610951
ABSTRACT:
BACKGROUND OF THE INVENTION
A present invention is related to a forward/backward switch protective structure for a remotely controllable car. When a throw plates of the output shaft are outward centrifugally extended, a shade body is located and prevented from moving. Therefore, respective components are protected from being impacted and worn out due to instantaneous switching between forward and backward rotation.
FIGS. 7 and 8
show a forward/backward power coupler of a remotely controllable car. A forward gear
82
and a backward gear
83
are disposed on an output shaft
81
. The forward and backward gears
82
,
83
are driven by a gear set
85
driven the same engine
84
. In addition, the forward and backward gears
82
,
83
are respectively provided with clutch seats
821
,
831
. The clutch seats
821
,
831
respectively have clutch plates
822
,
832
. The output shaft
81
has a differential section
811
between the forward and backward gears
82
,
83
. A clutch shade
86
is fitted on the differential section
811
. The clutch shade
86
has a differential hole
860
through which the differential section
811
is fitted. The clutch shade
86
is formed with annular grooves
861
,
862
respectively corresponding to the clutch plates
822
,
832
of the forward and backward gears
82
,
83
. When outward extended, the clutch plates
822
,
832
are inserted into the annular grooves
861
,
862
for driving the clutch shade
86
to drive the output shaft
81
.
In addition, the clutch shade
86
has an annular groove
863
in which a shifting plate
87
is inlaid. A servo (not shown) drives the shifting plate
87
to push the clutch shade
86
.
In a state that the clutch shade
86
covers the clutch seat
821
of the forward gear
82
as shown in
FIG. 7
, when the engine
84
drives the gear set
85
to rotate the forward gear
82
, the clutch plate
822
in the clutch seat
821
will centrifugally extend outward to abut against inner edge of the annular groove
861
of the clutch shade
86
to further drive the clutch shade
86
for driving the output shaft
81
, making the remotely controllable car move forward.
When the rotational speed of the engine
84
is reduced and the rotational speed of the forward gear
82
is slowed down, the spring
823
in the clutch seat
821
will push the clutch plate
822
and restore the clutch plate
822
into the clutch seat
821
without contacting with the clutch shade
86
as shown in FIG.
8
. At this time, the servo can drive the shifting plate
87
to push the clutch shade
86
to a position where the clutch shade
86
covers the clutch seat
831
of the backward gear
83
. Then, when the backward gear
83
is such rotated that the clutch plate
832
extends outward to contact with the annular groove
862
of the clutch shade
86
, the clutch shade
86
is driven in reverse direction to backward drive the output shaft
81
, whereby the remotely controllable car is moved backward.
However, when the clutch plate
822
is restored into the clutch seat
821
without contacting with the clutch shade
86
, the clutch shade
86
and the output shaft
81
are still in a not driven and freely rotatable state. Therefore, the remotely controllable car will inertially move forward. In other words, when the clutch shade
86
is pushed by the shifting plate
87
to the position where the clutch shade
86
covers the clutch seat
831
of the backward gear
83
, the clutch shade
86
and the output shaft
81
still inertially rotate forward. However, the engine
84
is able to instantaneously stop operating and then operate to a high speed state. At this time, the backward gear
83
is driven to make the clutch plate
832
extend outward. When the clutch plate
832
of the backward gear
83
contacts with the annular groove
862
of the still forward rotating clutch shade
86
, the backward rotating clutch plate
832
will suffer a very great friction in reverse direction. Accordingly, the clutch plate
832
is easy to be quickly worn out and the backward gear
83
and the gear set
85
will bear considerably great reaction force. Similarly, when the clutch shade
86
is switched from backward state to forward state, the above abnormal wear and reaction force will also take place. As a result, the clutch plates
822
,
832
and the gear set
85
will be quickly worn out to shorten the using life of the transmission mechanism.
Furthermore, the output power of the engine
84
is transmitted by the gear set
85
to the clutch plate
822
or
832
and then by means of the frictional contact between the clutch plate and the clutch shade
86
, the clutch shade
86
drives the output shaft
81
to rotate. The frictional loss between the two clutch plates
822
,
832
and the clutch shade
86
will lead to declination of the output power of the engine
84
. Therefore, the power can be hardly truly transmitted. This seriously affects the performance of the remotely controllable car, especially in a race.
There is no design for reducing friction between the clutch shade
86
and the shifting plate
87
. In other words, the quicker the rotational speed of the clutch shade
86
is, the greater the frictional loss between the shifting plate
87
and the clutch shade
86
is. This increases unnecessary power loss.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a forward/backward switch protective structure for remotely controllable car. Two throw plates are pivotally disposed in a seat body fixed on the output shaft. When the output shaft rotates, the throw plats are outward centrifugally extended and inserted into the annular grooves of a shade body to prevent the shade body from moving and avoid switch between forward and backward rotation. Therefore, the respectively transmission components are protected.
It is a further object of the present invention to provide the above forward/backward switch protective structure in which the differential section of the output shaft is fitted in the corresponding differential engaging hole of the shade body and the engaging sections of the shade body are respectively engaged with the stop sections of the forward and backward gears. Therefore, the power can be truly and directly transmitted from the forward and backward gears via the shade body to the output shaft.
It is still a further object of the present invention to provide the above forward/backward switch protective structure in which the arched insertion member of the shifting mechanism is located by both the link and the insertion rod. Therefore, when inserted into the rail of the shade body, the insertion member will not deflect to contact with the shade body. Accordingly, when the output shaft rotates, the friction between the shade body and the insertion member is avoided.
REFERENCES:
patent: 5274987 (1994-01-01), Wiener
patent: 5435797 (1995-07-01), Harris
patent: 5740892 (1998-04-01), Huang
Donovan Lincoln
Klaus Lisan
Thunder Tiger Corporation
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