Freewheel adjustable wheel and fitness bike therewith
A freewheel adjustable wheel may include a rotating gear rotated by power transmitted from a pedal unit, a fixing case rotatably supporting the rotating gear, an inner case mounted inside the fixing case, a clutch bearing disposed between the rotating gear and the inner case, a first gear, a drive unit fixed to the fixing case and supplying rotation power, and a moving gear moved by the rotation power of the drive unit. In addition, the moving gear may be operated in a non-freewheel mode of being engaged with the first gear and a freewheel mode of being spaced apart from the first gear.
1 . A freewheel adjustable wheel comprising:
a rotating gear rotated by power transmitted from a pedal unit;
a fixing case rotatably supporting the rotating gear;
an inner case mounted inside the fixing case;
a clutch bearing disposed between the rotating gear and the inner case, and configured to transmit power when the rotating gear is rotated in a forward direction;
a first gear having a shape including a first side fixed to the inner case and a second side surrounding an outer surface of the clutch bearing, and configured to receive power through the clutch bearing;
a drive unit fixed to the fixing case and configured to supply rotation power;
a moving gear configured to be moved by the rotation power of the drive unit and operated in a non-freewheel mode of being engaged with the first gear and a freewheel mode of being spaced apart from the first gear; and
a gear position adjusting unit disposed in each of the first gear and the moving gear, and configured to adjust a position at which the first gear and the moving gear are engaged with each other by at least one magnetic force.
2 . The freewheel adjustable wheel of claim 1 , wherein the gear position adjusting unit comprises:
a first adjusting unit provided along an outer circumference of a first coupling gear provided in the first gear and comprising a first magnetic force of the at least one magnetic force; and
a second adjusting unit disposed at a position facing the first adjusting unit, and provided along an outer circumference of a second gear provided in the moving gear and comprising a second magnetic force of the at least one magnetic force.
3 . The freewheel adjustable wheel of claim 2 , wherein the first adjusting unit and the second adjusting unit adjust a position of the second gear to be engaged with the first gear by using the first magnetic force or the second magnetic force, and
wherein the first magnetic force or the second magnetic force includes an attractive force or a repulsive force engaged with each other.
4 . The freewheel adjustable wheel of claim 1 , wherein the moving gear comprises:
an inner gear engaged with a spline gear provided in the rotating gear to be rotated together, and transmitting power while being moved in an axial direction of the rotating gear and engaged with the first gear; and
an outer rotating gear provided on an outer surface of the inner gear, and moving the inner gear in the axial direction of the rotating gear by an operation of being rotated by the rotation power transmitted from the drive unit.
5 . The freewheel adjustable wheel of claim 4 , wherein the inner gear comprises:
a second gear receiving power when engaged with the spline gear to receive power from the rotating gear, and moved toward the first gear to be engaged with the first gear;
an inner moving gear disposed between the second gear and the outer rotating gear, comprising a spiral gear engaged with an inner surface of the outer rotating gear, and moved by rotation of the outer rotating gear to move the second gear in the axial direction of the rotating gear; and
a guide bar having a bar shape fixed to the fixing case, and restricting rotation of the inner moving gear and guide axial rotation of the inner moving gear when in contact with the inner moving gear.
6 . The freewheel adjustable wheel of claim 5 , wherein the second gear comprises:
a second gear body extending in a ring shape, the second gear body in which a linear gear engaged with the spline gear is disposed along an inner circumference of the second gear body;
a second coupling gear forming teeth along an outer circumference of the second gear body facing the first gear; and
a connecting bearing disposed between the second gear and the inner moving gear.
7 . The freewheel adjustable wheel of claim 5 , wherein the second gear is rotatable in a circumferential direction, and connected to the gear position adjusting unit to be rotated by the at least one magnetic force.
8 . The freewheel adjustable wheel of claim 5 , wherein the gear position adjusting unit comprises:
a first adjusting unit disposed in the first gear and comprising a first magnetic force of the at least one magnetic force; and
a second adjusting unit disposed in the second gear while facing the first adjusting unit, and comprising a second magnetic force of the at least one magnetic force.
9 . The freewheel adjustable wheel of claim 8 , wherein the first adjusting unit and the second adjusting unit adjusts a position at which the first gear and the second gear are rotated by the first magnetic force or the second magnetic force, and
wherein the first magnetic force or the second magnetic force includes a repulsive force or attractive force engaged with each other.
10 . The freewheel adjustable wheel of claim 8 , wherein the first adjusting unit comprises a plurality of first magnets connected to the first gear and disposed along a circumference of a first coupling gear engaged with the second gear.
11 . The freewheel adjustable wheel of claim 8 , wherein the second adjusting unit comprises a plurality of second magnets connected to the second gear and disposed along a circumference of a second coupling gear engaged with the first gear.
12 . The freewheel adjustable wheel of claim 1 , wherein the first gear comprises:
a first gear body surrounding the outer surface of the clutch bearing and fixed to the inner case; and
a first coupling gear formed at one end of the first gear body toward the moving gear, and engaged with a second coupling gear provided in the moving gear.
13 . A fitness bike comprising:
a frame unit supporting a saddle and a handle;
a pedal unit provided in a rotating disc disposed on a lateral surface of the frame unit;
a rotating gear configured to be rotated by a power transmitted from the pedal unit, and rotatably coupled to an outer surface of a shaft and having a spline gear disposed on an outer surface of a rotation body of the rotating gear;
a fixing case rotatably supporting the rotating gear while rotation of the rotating gear is restricted;
an inner case mounted inside the fixing case;
a clutch bearing disposed between the rotating gear and the inner case and configured to transmit power when the rotating gear is rotated in a forward direction;
a first gear having a shape including a first side fixed to the inner case and a second side surrounding an outer surface of the clutch bearing, and configured to receive power through the clutch bearing;
a drive unit fixed to the fixing case and configured to supply rotation power;
a moving gear configured to be moved by the rotation power of the drive unit and operated in a non-freewheel mode of being engaged with the first gear and a freewheel mode of being spaced apart from the first gear;
a gear position adjusting unit disposed in each of the first gear and the moving gear, and configured to adjust a position at which the first gear and the moving gear are engaged with each other by at least one magnetic force; and
a protrusion detecting sensor disposed in the fixing case and configured to detect movement of the moving gear.
14 . The fitness bike of claim 13 , wherein the gear position adjusting unit comprises:
a first adjusting unit disposed in the first gear and having a first magnetic force of the at least one magnetic force; and
a second adjusting unit disposed in the moving gear, while facing the first adjusting unit, and having a second magnetic force of the at least one magnetic force.
15 . The fitness bike of claim 14 , wherein the first adjusting unit comprises a plurality of first magnets connected to the first gear and disposed along a circumference of a first coupling gear engaged with the moving gear.
16 . The fitness bike of claim 14 , wherein the second adjusting unit comprises a plurality of second magnets connected to the moving gear and disposed along a circumference of a second coupling gear engaged with the first gear.
17 . The fitness bike of claim 14 , wherein the moving gear comprises:
an inner gear engaged with the spline gear provided in the rotating gear to be rotated together, and transmitting power while being moved in an axial direction of the rotating gear and engaged with the first gear;
an outer rotating gear provided on an outer surface of the inner gear, and moving the inner gear in the axial direction of the rotating gear by an operation of being rotated by the rotation power transmitted from the drive unit; and
a sensing target protrusion protruding from the inner gear, and detected by the protrusion detecting sensor.
18 . The fitness bike of claim 17 , wherein the sensing target protrusion comprises:
a first protrusion protruding from the inner gear; and
a second protrusion protruding from the inner gear, with a length longer than a length of the first protrusion.
19 . The fitness bike of claim 18 , wherein the protrusion detecting sensor comprises:
a first sensor disposed on a movement path of the first protrusion and detecting movement of the first protrusion; and
a second sensor disposed on a movement path of the second protrusion and detecting movement of the second protrusion.
20 . The fitness bike of claim 13 , wherein the inner case is rotated by power transmitted from the rotating gear, and rotatably coupled to the fixing case.