Turning drive apparatus for model, and slip gear apparatus
In a turning drive apparatus ( 10 ) for turning a movable portion ( 3 ) of a model ( 1 ) by transmitting power from a drive source to the movable portion ( 3 ) through a gear train ( 11 ), a pair of gears ( 16, 17 ) included in the gear train ( 11 ) are coupled concentrically with each other through a common slip plate ( 18 ). A friction transmitting portion ( 30 ) is arranged by combining at least any one ( 17 ) of the gears with the slip plate ( 18 ) so that it makes a slip motion to the slip plate ( 18 ) in a circumferential direction.
1. A turning drive apparatus for a model for turning a movable portion of the model by transmitting power from a drive source to the movable portion, comprising:
a gear train for transmitting power to the movable portion, said gear train comprising:
a pair of gears; and
a friction transmitting portion being interposed between the pair of gears, the friction transmitting portion using friction force to transmit the power, wherein
the pair or gears are concentrically coupled with each other through a common slip plate;
any one of the pair of gears has a hollow portion at a center side of gear, an outer circumference of the slip plate is engaged with an inner periphery of the hollow portion; and
the other gear is combined to the slip plate so that the other gear makes a slip motion in a circumferential direction, thereby the friction transmitting portion is interposed between the other gear and the slip plate; wherein
a radially deformable spring portion disposed on a center side of the slip plate, an inner circumference of the spring portion is engaged with an outer circumference of an axis of the other gear by forming so that a radius of the outer circumference of the axis of the other gear is slightly longer than a radius of the inner circumference of the spring portion.
2. A slip gear apparatus disposed in a gear train for turning a movable portion of a model by transmitting power from a drive source to the movable portion, comprising:
a slip plate; and
a pair of gears being coupled concentrically with each other through the slip plate,
wherein any one of the pair of gears is combined to the slip plate so that the gear makes a slip motion in a circumferential direction, and a friction transmitting portion is interposed between the gear and the slip plate; wherein
a radially deformable spring portion disposed on a center side of the slip plate, an inner circumference of the spring portion is engaged with an outer circumference of an axis of the other gear by forming so that a radius of the outer circumference of the axis of the other near is slightly longer than a radius of the inner circumference of the spring portion; and
the other gear of the pair of gears has a hollow portion at a center side of the gear, an outer circumference of the slip plate is engaged with an inner periphery of the hollow portion.