BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view illustrating an automatic speed reducing ratio-switching apparatus according to an embodiment of the present invention;
FIG. 2 is a partial magnified perspective view illustrating a state in which a first planetary gear mechanism and a second planetary gear mechanism are juxtaposed to make up the automatic speed reducing ratio-switching apparatus shown in FIG. 1;
FIG. 3 is a longitudinal sectional view taken in the axial direction illustrating the automatic speed reducing ratio-switching apparatus shown in FIG. 1;
FIG. 4 is a partial magnified longitudinal sectional view illustrating features shown in FIG. 3;
FIG. 5 is a vertical sectional view taken along line V-V shown in FIG. 3;
FIG. 6 is a vertical sectional view illustrating a free state of first and second outer clutch members, which are provided at outer circumferences of input side and output side ring gears;
FIG. 7 is a vertical sectional view illustrating a locked state in which roller bearings making up the first and second outer clutch members engage with grooves;
FIG. 8 is a vertical sectional view illustrating a free state of first and second inner clutch members, which are interposed between an input shaft and respective input side and output side sun gears;
FIG. 9 is a vertical sectional view illustrating a locked state in which needle bearings making up the first and second inner clutch members engage with grooves;
FIG. 10 is, with partial omission, a side view in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor for driving wheels;
FIG. 11 is a view showing motor characteristics, which illustrate the relationship between the number of revolutions and torque;
FIG. 12 is a view showing motor characteristics, which illustrate the relationship between the number of revolutions and torque;
FIG. 13A is a view showing complete viscous characteristics, in which the relationship between the number of revolutions and torque is linear, and FIG. 13B shows static friction and viscous characteristics, in which the relationship between the number of revolutions and torque is changed;
FIG. 14 is a view showing resistance characteristics, illustrating the relationship between the number of revolutions and torque;
FIG. 15A is a vertical sectional view illustrating a detent mechanism, in which a ball is fastened by being pressed by a spring, and FIG. 15B shows a vertical sectional view illustrating a static friction mechanism, in which a friction member is fastened by being pressed by a spring;
FIG. 16 is a view showing characteristics illustrating changes in torque with respect to the number of revolutions, and depending on the presence or absence of a lockup mechanism or a centrifugal clutch mechanism;
FIG. 17 is a view showing a schematic arrangement in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a press machine;
FIG. 18 is a view showing a schematic arrangement in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor for driving an axial pump;
FIG. 19 is a view showing a schematic arrangement in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor for driving a ball screw mechanism;
FIG. 20 is a view showing a schematic arrangement in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor for driving a ball screw shaft;
FIG. 21 is a view showing a schematic arrangement in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor for driving an axial pump;
FIG. 22 is a view showing a schematic arrangement in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a geared motor for driving a conveyor;
FIG. 23 is a front view illustrating an electric drill;
FIG. 24 is a perspective view in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor for driving a drill member of an electric drill;
FIG. 25 is a perspective view in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor of a screw fastening machine;
FIG. 26 is a view showing characteristics illustrating torque change with respect to the number of revolutions of a geared motor;
FIG. 27 is a perspective view in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a rotary actuator for rotating a workpiece;
FIG. 28 is a perspective view in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a motor for driving an electric wheelchair;
FIG. 29 is a side view illustrating a state in which the electric wheelchair shown in FIG. 28 rises over a step;
FIG. 30 is a side view in which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied to a clamp apparatus;
FIG. 31 is a front view illustrating a slide door disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 32 is a perspective view illustrating an electric chair disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 33 is a vertical sectional view illustrating an electromechanical actuator disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 34 is a vertical sectional view illustrating an electric fastener disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 35 is a vertical sectional view illustrating a clamp apparatus disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 36 is a vertical sectional view illustrating an automatic torque-switching apparatus disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 37 is a vertical sectional view illustrating an electromechanical wheel brake apparatus disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 38 is a vertical sectional view illustrating a torque-converting apparatus disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied;
FIG. 39 is a perspective view illustrating an electric wheelchair disclosed in a conventional technique, and to which the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention is applied; and
FIGS. 40A to 40D are views showing schematic arrangements illustrating combination patterns of the automatic speed reducing ratio-switching apparatus according to the embodiment of the present invention and the planet gear mechanism respectively.