Cycloid drive epicycloid planet gear cam
An epicycloid planet gear cam that converts rotational movement of a driveshaft into linear movement of an output device is disclosed. An epicycloid planet gear is assembled inside a stationary housing with an internal stationary ring gear. A driveshaft eccentric is connected to a driveshaft. The driveshaft eccentric rotates freely in a mounting hole of the epicycloid planet gear. When the driveshaft rotates, the driveshaft eccentric engages the epicycloid planet gear against the stationary ring gear and causes the epicycloid planet gear to rotate. A cam follower pin attached to an output device is held against a cam track of the epicycloid planet gear. As the epicycloid planet gear rotates, the raised cam track height or the slotted cam track distance from the center of the epicycloid planet gear causes the cam follower pin to move up, down, in, or out thereby moving the output device.
1. An epicycloid planet gear cam comprising:
a stationary housing comprising:
an internal stationary ring gear comprising a plurality of ring gear lobes and a plurality of ring gear lobe clearances disposed between the plurality of ring gear lobes; and
a driveshaft clearance hole;
a cam follower pin;
an epicycloid planet gear disposed in the internal stationary ring gear comprising:
a cycloid body;
a plurality of cycloid lobes disposed around the cycloid body;
a plurality of cycloid lobe clearances disposed between the plurality of cycloid lobes;
wherein, the plurality of cycloid lobes and the plurality of cycloid lobe clearance engage with the plurality of ring gear lobes and the plurality of ring gear lobe clearances;
an eccentric mounting hole disposed in the cycloid body; and
a cam track disposed on the cycloid body, the cam follower pin contacting the cam track;
wherein, as the epicycloid planet gear rotates, the cam track causes the cam follower pin to move in relation to variances of the cam track;
a driveshaft eccentric comprising:
a cycloid mounting disc;
an epicycloid planet gear eccentric driver disposed on the cycloid mounting disc, the epicycloid planet gear eccentric driver rotating freely in the eccentric mounting hole;
an eccentric driver counterbalance disposed on an opposite side of the cycloid mounting disc from the epicycloid planet gear eccentric driver and positioned at a half-rotation relative to the epicycloid planet gear eccentric driver; and
an eccentric hole extending through the cycloid mounting disc, the epicycloid planet gear eccentric driver, and the eccentric driver counterbalance;
wherein, the driveshaft eccentric connects with a driveshaft extending through the driveshaft clearance hole and into the eccentric hole; and
wherein the epicycloid planet gear cam simultaneously converts rotational movement of the driveshaft into linear movement, reduces speed, and increases torque.
2. The epicycloid planet gear cam of claim 1 , wherein the cam track varies in height away from the cycloid body and as the epicycloid planet gear rotates, the cam track causes the cam follower pin to move in relation to the height of the cam track.
3. The epicycloid planet gear cam of claim 1 , the cam track comprising:
a cam track start; and
a cam track end, the cam track gradually increasing in height above the cycloid body starting from the cam track start to the cam track end.
4. The epicycloid planet gear cam of claim 1 , wherein the cam track gradually increases and decreases in height around the epicycloid planet gear in an uninterrupted path causing the cam follower pin to continuously raise and lower.
5. The epicycloid planet gear cam of claim 1 , wherein the cam track increases and decreases in height multiple times around the epicycloid planet gear causing the cam follower pin to continually raise and lower at a faster speed.
6. The epicycloid planet gear cam of claim 1 , the cam track comprising a slot disposed in the cycloid body, the cam track varying in distance away from a center of the epicycloid planet gear.
7. The epicycloid planet gear cam of claim 1 , the cam track comprising a slot disposed in the cycloid body, the cam track gradually decreasing in distance from a center of the epicycloids planet gear at a constant rate.
8. The epicycloid planet gear cam of claim 1 , the cam track comprising a slot disposed in the cycloid body, the cam track decreasing in distance from a center of the epicycloids planet gear at an exponential rate.
9. The epicycloid planet gear cam of claim 1 , the cam track comprising a slot disposed in the cycloid body, the cam track gradually increasing and decreasing in distance from a center of the epicycloid planet gear in an uninterrupted path around the cycloid body.
10. The epicycloid planet gear cam of claim 1 , the cam track comprising a slot disposed in the cycloid body, the cam track increasing and decreasing in distance from a center of the epicycloid planet gear multiple times around the cycloid body.
11. An epicycloid planet gear cam comprising:
a stationary housing comprising:
an internal stationary ring gear comprising a plurality of ring gear lobes and a plurality of ring gear lobe clearances disposed between the plurality of ring gear lobes; and
a driveshaft clearance hole;
a cam follower pin;
an epicycloid planet gear disposed in the internal stationary ring gear comprising:
a cycloid body;
a plurality of cycloid lobes disposed around the cycloid body;
a plurality of cycloid lobe clearances disposed between the plurality of cycloid lobes;
wherein, the plurality of cycloid lobes and the plurality of cycloid lobe clearance engage with the plurality of ring gear lobes and the plurality of ring gear lobe clearances;
an eccentric mounting hole disposed in the cycloid body; and
a cam track disposed on the cycloid body, the cam follower pin contacting the cam track, and the cam track varying in height away from the cycloid body;
wherein, as the epicycloid planet gear rotates, the cam track causes the cam follower pin to move in relation to the height of the cam track;
a driveshaft eccentric comprising:
a cycloid mounting disc;
an epicycloid planet gear eccentric driver disposed on the cycloid mounting disc, the epicycloid planet gear eccentric driver rotating freely in the eccentric mounting hole;
an eccentric driver counterbalance disposed on an opposite side of the cycloid mounting disc from the epicycloid planet gear eccentric driver and positioned at a half-rotation relative to the epicycloid planet gear eccentric driver; and
an eccentric hole extending through the cycloid mounting disc, the epicycloid planet gear eccentric driver, and the eccentric driver counterbalance;
wherein, the driveshaft eccentric connects with a driveshaft extending through the driveshaft clearance hole and into the eccentric hole; and
wherein the epicycloid planet gear cam simultaneously converts rotational movement of the driveshaft into linear movement, reduces speed, and increases torque.
12. The epicycloid planet gear cam of claim 11 , the cam track comprising:
a cam track start; and
a cam track end, the cam track gradually increasing in height above the cycloid body starting from the cam track start to the cam track end.
13. The epicycloid planet gear cam of claim 11 , wherein the cam track gradually increases and decreases in height around the epicycloid planet gear in an uninterrupted path causing the cam follower pin to continuously raise and lower.
14. The epicycloid planet gear cam of claim 11 , wherein the cam track increases and decreases in height multiple times around the epicycloid planet gear causing the cam follower pin to continually raise and lower at a faster speed.
15. An epicycloid planet gear cam comprising:
a stationary housing comprising:
an internal stationary ring gear comprising a plurality of ring gear lobes and a plurality of ring gear lobe clearances disposed between the plurality of ring gear lobes; and
a driveshaft clearance hole;
a cam follower pin;
an epicycloid planet gear disposed in the internal stationary ring gear comprising:
a cycloid body;
a plurality of cycloid lobes disposed around the cycloid body;
a plurality of cycloid lobe clearances disposed between the plurality of cycloid lobes;
wherein, the plurality of cycloid lobes and the plurality of cycloid lobe clearance engage with the plurality of ring gear lobes and the plurality of ring gear lobe clearances;
an eccentric mounting hole disposed in the cycloid body; and
a cam track comprising a slot disposed in the cycloid body, the cam follower pin contacting the cam track, and the cam track varying in distance away from a center of the epicycloid planet gear;
wherein, as the epicycloid planet gear rotates, the cam track causes the cam follower pin to move in relation to the distance of the cam track away from the center of the epicycloid planet gear;
a driveshaft eccentric comprising:
a cycloid mounting disc;
an epicycloid planet gear eccentric driver disposed on the cycloid mounting disc, the epicycloid planet gear eccentric driver rotating freely in the eccentric mounting hole;
an eccentric driver counterbalance disposed on an opposite side of the cycloid mounting disc from the epicycloid planet gear eccentric driver and positioned at a half-rotation relative to the epicycloid planet gear eccentric driver; and
an eccentric hole extending through the cycloid mounting disc, the epicycloid planet gear eccentric driver, and the eccentric driver counterbalance;
wherein, the driveshaft eccentric connects with a driveshaft extending through the driveshaft clearance hole and into the eccentric hole; and
wherein the epicycloid planet gear cam simultaneously converts rotational movement of the driveshaft into linear movement, reduces speed, and increases torque.
16. The epicycloid planet gear cam of claim 15 , wherein the cam track gradually decreases in distance from the center of the epicycloid planet gear at a constant rate.
17. The epicycloid planet gear cam of claim 15 , wherein the cam track decreases in distance from the center of the epicycloid planet gear at an exponential rate.
18. The epicycloid planet gear cam of claim 15 , wherein the cam track gradually increases and decreases in distance from the center of the epicycloid planet gear in an uninterrupted path around the cycloid body.
19. The epicycloid planet gear cam of claim 15 , wherein the cam track increases and decreases in distance from the center of the epicycloid planet gear multiple times around the cycloid body.