Gear transmission and derailleur system
A transmission system for vehicles, including bicycles, is disclosed. The system aligns a chain or other drive means to a center of each of a plurality of provided sprockets, allows for a smaller, lighter and more durable shifter/controller, and reduces various complications associated with cable slack and shifting. A derailleur is provided with linear actuated features to directly translate drive means from one position to another along a desired path.
1. A bicycle transmission system, comprising: a series of parallel drive sprockets fixedly attached to a bicycle wheel and driven by a drive member;
an electronic derailleur, comprising:
a mount for securing the electronic derailleur to a bicycle frame proximate the drive sprockets;
a housing containing a gear climb, the gear climb having a plurality of tapered features defining a plurality of positions characterized by the drive member being aligned with one of the drive sockets;
a biased member configured to bias the gear climb toward one of the plurality of positions;
an electric motor in force-transmitting communication with the gear climb, the electric motor configured to move the gear climb so that at least one of the plurality of tapered features displaces the biased member; and
a motor gear operably connected to the electric motor, the motor gear comprising an outer surface that engages the plurality of tapered features of the gear climb.
2. The bicycle transmission system of claim 1 , further comprising a remote control for controlling the electric motor, wherein the remote control transmits signals to the electric motor via a wired connection.
3. The bicycle transmission system of claim 1 , further comprising a remote control for controlling the electric motor, wherein the remote control transmits signals to the electric motor wirelessly.
4. The bicycle transmission system of claim 1 , further comprising a gearbox that transmits force from the motor to the motor gear.
5. The bicycle transmission system of claim 1 , wherein the motor gear is a disk-shaped gear.
6. The bicycle transmission system of claim 1 , wherein the electric motor is a worm gear motor and the motor gear is a worm gear.
7. The bicycle transmission system of claim 1 , wherein the housing is completely sealed.
8. The bicycle transmission system of claim 1 , further comprising a speed controller and a motor sensor.
9. The bicycle transmission system of claim 8 , wherein the motor sensor is at least one of an optical sensor, a magnetic sensor, and a capacitive sensor.
10. The bicycle transmission system of claim 1 , wherein the remote control is mounted on a bicycle handlebar.
11. The bicycle transmission system of claim 1 , wherein the electric motor is one of a servo motor, a stepper motor, a brushless motor and a worm gear motor.
12. An electronic derailleur, comprising:
a sealed housing containing a gear climb in force transmitting communication with a drive member, the gear climb movable among a plurality of positions, each of the plurality of positions aligning the drive member with one of a plurality of drive sprockets;
a series of alternating peaks and valleys on an outer surface of the gear climb, the peaks defining a maximum radius of the gear climb and the valleys describing a minimum radius of the gear climb, each valley corresponding to one of the plurality of positions;
an electric motor configured to rotate a motor gear in force transmitting communication with the gear climb, rotation of the motor gear causing the gear climb to move from one of the plurality of positions toward another of the plurality of positions; and
a biased member in contact with the outer surface of the gear climb, the biased member configured to bias the gear climb toward one of the plurality of positions when the gear climb is not in one of the plurality of positions.
13. The electronic derailleur of claim 12 , further comprising:
a remote control in electronic communication with the electric motor.
14. The electronic derailleur of claim 12 , further comprising a speed controller, and wherein the electric motor is a brushless motor.
15. The electronic derailleur of claim 12 , further comprising a motor sensor.
16. The electronic derailleur of claim 12 , further comprising a gear box attached to the motor, the gear box operably engaged with the motor gear.
17. A derailleur comprising:
a gear climb contained within a sealed housing and in force-transmitting communication with a drive member, the gear climb adjustable among a plurality of tapered features defining a plurality of positions to align the drive member with one of a plurality of drive sprockets;
an electric motor configured to selectively move the gear climb from one of the plurality of positions to another of the plurality of positions in response to signals received from a remote control;
a motor sensor configured to detect an absolute rotational position of the electric motor and relative rotational movement of the electric motor;
an integrated circuit operably connected to the motor sensor, the integrated circuit comprising logic for determining a location of the gear climb relative to at least one of the plurality of positions based on at least one of the absolute rotational position of the electric motor and the relative rotational movement of the electric motor; and
a motor gear operably connected to the electric motor, the motor gear comprising an outer surface that engages the plurality of tapered features of the gear climb.
18. The derailleur of claim 17 , further comprising a speed controller, and wherein the electric motor is a brushless motor.
19. The derailleur of claim 17 , wherein the motor sensor is one of an optical sensor, a magnetic sensor, and a capacitive sensor.