Two-speed drive system for motor-driven appliances
There is disclosed a mechanical two-speed drive system/gearbox for household appliances such as a blender or food processor. The gearbox comprises a motor, a motor shaft, a drive-outlet, and the installation of one-way bearings in suitable places in the gear-train. The drive-outlet can be driven at two different speeds in the same rotational direction. By operating the motor in the clockwise direction and counter-clockwise direction, a change in the drive-outlet rpm is achieved. When operating in the hi-speed mode, the drive-outlet is directly driven by the motor. When operating in the lo-speed mode, the drive-outlet is driven via the gear-train, with a resulting increase in torque. This gearbox is simple to construct, and operable without expensive control electronics. In particular applications with electronic motor speed and directional control, a much broader and useable drive-outlet speed range is achieved.
1. A two-speed drive system for household appliances comprising:
a motor and a motor shaft installed and coupled to a support bracket, wherein the support bracket is mounted in a base of a household appliance;
a first one-way bearing installed at a middle section of the motor shaft;
a second one-way bearing installed at an upper end section of the motor shaft;
a drive-shaft mounted on the second one-way bearing;
a third one-way bearing installed at a middle section of the drive-shaft;
a drive gear installed on the third one-way bearing; and
a drive outlet installed at an upper end of the drive-shaft;
wherein the first one-way bearing is arranged with a first gear that is connected with and drives a gear down system; and at a top of the gear down system there is an installed a top gear which drives the drive gear of the drive-shaft and the drive-outlet.
2. A two-speed drive system for household appliances according to claim 1 , wherein the gear down system is a worm gear down system.
3. A two-speed drive system for household appliances according to claim 1 , wherein the gear down system is a planetary gear down system.
4. A two-speed drive system for household appliances according to any one of claim 1 , wherein the first one-way bearing and the third one-way bearing are each set in one drive direction; the second one-way bearing is set in opposite drive direction; and the first one-way bearing and the third one-way bearing are each driven via the gear down system.
5. A two-speed drive system for household appliances according to any one of claim 2 , wherein the first one-way bearing and the third one-way bearing are each set in one drive direction; the second one-way bearing is set in opposite drive direction; and the first one-way bearing and the third one-way bearing are each driven via the worm gear down system.
6. A two-speed drive system for household appliances according to any one of claim 3 , wherein the first one-way bearing and the third one-way bearing are each set in one drive direction; the second one-way bearing is set in opposite drive direction; and the first one-way bearing and the third one-way bearing are each driven via the planetary gear down system.
7. A two-speed drive system for household appliances according to claim 4 , wherein the first one-way bearing and the third one-way bearing are each set in clockwise drive direction (CW) when viewed from the top; the second one-way bearing is set in counter-clockwise drive direction (CCW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a high speed in counter-clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at a low speed in counter-clockwise direction.
8. A two-speed drive system for household appliances according to claim 5 , wherein the first one-way bearing and the third one-way bearing are each set in clockwise drive direction (CW) when viewed from the top; the second one-way bearing is set in counter-clockwise drive direction (CCW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a high speed in counter-clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at a low speed in counter-clockwise direction.
9. A two-speed drive system for household appliances according to claim 6 , wherein the first one-way bearing and the third one-way bearing are each set in clockwise drive direction (CW) when viewed from the top; the second one-way bearing is set in counter-clockwise drive direction (CCW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a high speed in counter-clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at a low speed in counter-clockwise direction.
10. A two-speed drive system for household appliances according to claim 4 , wherein the first one-way bearing and the third one-way bearing are each set in counter-clockwise drive direction (CCW) when viewed from the top, the second one-way bearing is set in clockwise drive direction (CW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a low speed in clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at high speed in clockwise direction.
11. A two-speed drive system for household appliances according to claim 5 , wherein the first one-way bearing and the third one-way bearing are each set in counter-clockwise drive direction (CCW) when viewed from the top, the second one-way bearing is set in clockwise drive direction (CW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a low speed in clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at high speed in clockwise direction.
12. A two-speed drive system for household appliances according to claim 6 , wherein the first one-way bearing and the third one-way bearing are each set in counter-clockwise drive direction (CCW) when viewed from the top, the second one-way bearing is set in clockwise drive direction (CW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a low speed in clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at high speed in clockwise direction.
13. A two-speed drive system for household appliances according to claim 2 , wherein the first gear is a worm which is arranged with the first one-way bearing, the worm is connected to and drives the worm gear down system; the worm gear down system comprising
a worm gear connected with and driven by the worm;
a first bevel gear set with another side of the worm gear, the first bevel gear connects with and drives a second bevel gear; and
a top of the second bevel gear is set with the top gear which connects with and drives the drive gear of the third one-way bearing.
14. A two-speed drive system for household appliances according to claim 3 , wherein the first one-way bearing that is arranged with the first gear is connected with and drives the planetary gear down system, the planetary gear down system comprising
a second gear connected with and driven by the first gear;
a sun gear connect with and driven by the second gear;
a set of planet gear driven by the sun gear;
an arm installed with the set of planet gear which runs inside a ring gear;
wherein the top gear is installed on the arm; and
the top gear connects with and drives the drive gear of the third one-way bearing.
15. A two-speed drive system for household appliances according to claim 13 , wherein the first one-way bearing and the third one-way bearing are each set in one drive direction; the second one-way bearing is set in opposite drive direction; and the first one-way bearing and the third one-way bearing are each driven via the worm gear down system.
16. A two-speed drive system for household appliances according to claim 14 , wherein the first one-way bearing and the third one-way bearing are each set in one drive direction; the second one-way bearing is set in opposite drive direction; and the first one-way bearing and the third one-way bearing are each driven via the planetary gear down system.
17. A two-speed drive system for household appliances according to claim 15 , wherein the first one-way bearing and the third one-way bearing are each set in clockwise drive direction (CW) when viewed from the top; the second one-way bearing is set in counter-clockwise drive direction (CCW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a high speed in counter-clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at a low speed in counter-clockwise direction.
18. A two-speed drive system for household appliances according to claim 16 , wherein the first one-way bearing and the third one-way bearing are each set in clockwise drive direction (CW) when viewed from the top; the second one-way bearing is set in counter-clockwise drive direction (CCW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a high speed in counter-clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at a low speed in counter-clockwise direction.
19. A two-speed drive system for household appliances according to claim 15 , wherein the first one-way bearing and the third one-way bearing are each set in counter-clockwise drive direction (CCW) when viewed from the top, the second one-way bearing is set in clockwise drive direction (CW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a low speed in clockwise direction; when the motor is driven in clockwise direction, the drive-shaft is driven at high speed in clockwise direction.
20. A two-speed drive system for household appliances according to claim 16 , wherein the first one-way bearing and the third one-way bearing are each set in counter-clockwise drive direction (CCW) when viewed from the top, the second one-way bearing is set in clockwise drive direction (CW); and
when the motor is driven in counter-clockwise direction, the drive-shaft is driven at a low speed in clockwise direction; when the motor is driven in clockwise direction, the driveshaft is driven at high speed in clockwise direction.