Low cost block and tackle robot transmission
A block-and-tackle transmission includes a timing belt input pinion, a timing belt, two or more shuttles, an output cable, and an output hub. The timing belt input pinion is for receiving input power. The timing belt is driven by the input pinion. The timing belt causes two shuttles of the two or more shuttles to move in opposing directions. Opposing ends of the output cable are pulled by two of the two or more shuttles. The output cable causes the output hub to transmit output power.
1. A block-and-tackle transmission, comprising:
a timing belt input pinion for receiving input power;
a timing belt, wherein the timing belt is driven by the input pinion;
at least four shuttles, wherein the timing belt causes two shuttles of the at least four shuttles to move in opposing directions;
two stage-1 cables, wherein one end of each stage-1 cable terminates on one of the at least four shuttles;
an output cable, wherein opposing ends of the output cable are pulled by two of the at least four shuttles; and
an output hub, wherein the output cable causes the output hub to transmit output power.
2. The block-and-tackle transmission of claim 1 , further comprising a transmission chassis.
3. The block-and-tackle transmission of claim 2 , wherein the timing belt input pinion rotates about an axle mounted on the transmission chassis.
4. The block-and-tackle transmission of claim 2 , wherein the timing belt has two ends, and wherein each end of the timing belt terminates on the transmission chassis.
5. The block-and-tackle transmission of claim 1 , wherein each shuttle of the at least four shuttles comprises a pulley and a supporting clevis.
6. The block-and-tackle transmission of claim 1 , wherein one or more of the at least four shuttles additionally comprises a ferrule that allows the shuttle to self-align to the timing belt.
7. The block-and-tackle transmission of claim 1 , wherein the timing belt comprises teeth, wherein the teeth engage the timing belt input pinion.
8. The block-and-tackle transmission of claim 7 , further comprising one or more belt idlers positioned to ensure the timing belt teeth remain engaged with the timing belt input pinion at all times.
9. The block-and-tackle transmission of claim 1 , further comprising one or more tension sensors positioned to measure tension in the output cable.
10. The block-and-tackle transmission of claim 9 , wherein the one or more tension sensors comprise two tension sensors configured to reject common mode noise.
11. The block-and-tackle transmission of claim 9 , wherein the one or more tension sensors comprise two tension sensors configured to compensate for temperature drift.
12. The block-and-tackle transmission of claim 1 , further comprising an output cable termination to affix the output cable to the output hub.
13. The block-and-tackle transmission of claim 1 , further comprising an output angle sensor to measure the angular position of the output hub.
14. The block-and-tackle transmission of claim 1 , further comprising a motor for driving the timing belt input pinion.
15. The block-and-tackle transmission of claim 14 , further comprising a motor encoder to measure the motor position.
16. The block-and-tackle transmission of claim 1 , further comprising an input transmission to increase the transmission ratio.
17. The block-and-tackle transmission of claim 16 , wherein the input transmission comprises a motor spur pinion and an input spur gear.
18. The block-and-tackle transmission of claim 1 , further comprising sensors for sensing performance information.
19. The block-and-tackle transmission of claim 1 , further comprising diagnostics for determining status information describing parts of the block-and-tackle transmission.
20. The block-and-tackle transmission of claim 19 , wherein the diagnostics receive performance information from sensors.
21. The block-and-tackle transmission of claim 1 , further comprising a controller for controlling the input power.
22. The block-and-tackle transmission of claim 21 , wherein the controller receives performance information from sensors and status information describing parts of the block-and-tackle transmission from diagnostics.