Exercise machine differential
An exercise machine comprises a motor, a gearbox coupled to the motor, a spool coupled to the gearbox, and a cable wound about the spool. The gearbox comprises bevel gears.
1. An exercise machine, comprising:
a motor;
a gearbox coupled to the motor, wherein the gearbox comprises bevel gears, and wherein the gearbox is a differential;
a spool coupled to the gearbox; and
a cable wound about the spool.
2. The exercise machine of claim 1 , wherein a belt couples the gearbox to the motor.
3. The exercise machine of claim 1 , wherein the bevel gears are spherical gears.
4. The exercise machine of claim 1 , wherein the bevel gears are inside a belt sprocket coupled to the motor.
5. The exercise machine of claim 1 , wherein the spool is mounted on a gear.
6. The exercise machine of claim 1 , wherein the gearbox includes a planetary gearset.
7. The exercise machine of claim 6 , wherein the planetary gearset includes a sun gear and a planet gear, and wherein the spool is mounted on the sun gear.
8. The exercise machine of claim 1 , further comprising a second spool and a second cable, wherein the second spool is coupled to the gearbox and the second cable is wound about the second spool.
9. The exercise machine of claim 8 , wherein the differential comprises a belt sprocket, wherein a belt couples the belt sprocket to the motor.
10. The exercise machine of claim 8 , wherein the differential comprises a belt sprocket, wherein a toothed belt couples the belt sprocket to the motor.
11. The exercise machine of claim 10 , wherein the bevel gears comprise: a planet gear mounted inside the belt sprocket; and a sun gear, wherein the spool is mounted on the sun gear.
12. An exercise machine, comprising:
a motor;
a gearbox coupled to the motor, wherein the gearbox comprises bevel gears, and wherein the bevel gears are inside a belt sprocket coupled to the motor;
a spool coupled to the gearbox; and
a cable wound about the spool.
13. The exercise machine of claim 12 , wherein the gearbox is a differential.
14. The exercise machine of claim 12 , wherein a belt couples the gearbox to the motor.
15. The exercise machine of claim 12 , wherein the bevel gears are spherical gears.
16. The exercise machine of claim 12 , wherein the spool is mounted on a gear.
17. The exercise machine of claim 12 , wherein the gearbox includes a planetary gearset.
18. The exercise machine of claim 17 , wherein the planetary gearset includes a sun gear and a planet gear, and wherein the spool is mounted on the sun gear.
19. The exercise machine of claim 12 , wherein the gearbox is a differential, the exercise machine further comprising a second spool and a second cable, wherein the second spool is coupled to the gearbox and the second cable is wound about the second spool.
20. The exercise machine of claim 19 , wherein the differential comprises the belt sprocket, wherein a belt couples the belt sprocket to the motor.
21. The exercise machine of claim 19 , wherein the differential comprises the belt sprocket, wherein a toothed belt couples the belt sprocket to the motor.
22. The exercise machine of claim 20 , wherein the bevel gears comprise: a planet gear mounted inside the belt sprocket; and a sun gear; wherein the spool is mounted on the sun gear.