6-bar vehicle suspension linkage with drive train idler
A two-wheel vehicle suspension linkage comprising: a suspended body 1 , a wheel carrier body 2 , a link body 3 , a link body 4 , a link body 5 , and a link body 6 operatively coupled defining a primary instantaneous velocity center at each joint between link bodies; a driven cog operatively connected to a rear wheel; a driving cog operatively connected to the suspended body 1 ; an idler operatively connected by an elongated flexible member to a link body, wherein the idler is rotatable about an idler rotation axis; an elongated flexible member is disposed along a route between the driving cog and the driven cog. The idler is disposed in the route between the driving cog and the driven cog; and a damper unit is configured to resist movement between two or more of the link bodies.
1. A two-wheel vehicle suspension linkage comprising:
a suspended body 1 , a wheel carrier body 2 , a link body 3 , a link body 4 , a link body 5 , and a link body 6 operatively coupled defining a primary instantaneous velocity center (PIVC) at each joint between link bodies;
a wheel operatively connected to the wheel carrier body 2 ;
a driven cog operatively connected to the wheel;
a driving cog operatively connected to the suspended body 1 , the driving cog being disposed transversely inboard of at least a portion of at least one of the link bodies in a plane extending through the driving cog, parallel to gravity, and parallel to an axis of rotation of the driving cog;
an idler operatively connected by an elongated flexible member to the wheel carrier body 2 , the link body 3 , the link body 4 , the link body 5 or the link body 6 , wherein the idler is rotatable about an idler rotation axis and wherein the idler is pivotally connected to the suspended body;
the elongated flexible member is disposed along a route between the driving cog and the driven cog, wherein the idler is disposed in the route between the driving cog and the driven cog; and
a damper unit configured to resist movement between two or more of the suspended body 1 , wheel carrier body 2 , link body 3 , link body 4 , link body 5 , or link body 6 .
2. The two-wheel vehicle suspension linkage of claim 1 , wherein the idler is rotatably connected to suspended body 1 concentrically with a linkage pivot with the wheel carrier body 2 , the link body 3 , the link body 4 , the link body 5 or the link body 6 .
3. The two-wheel vehicle suspension linkage of claim 2 , wherein:
the link body 3 includes jointed connections with:
the suspended body 1 defining a PIVC[1][3],
the link body 4 defining a PIVC[3][4], and
the link body 6 defining a PIVC[3][6]; and
the link body 4 includes a jointed connection with the wheel carrier body 2 defining a PIVC[2][4];
the link body 5 includes jointed connections with:
the suspended body 1 defining a PIVC[1][5],
the wheel carrier body 2 defining a PIVC[2][5], and
the link body 6 defining a PIVC[5][6]; wherein the idler rotation axis is coincident to the PIVC[1][3].
4. The two-wheel vehicle suspension linkage of claim 3 , wherein the link body 6 defines a longitudinal axis, and the longitudinal axis moves from a position behind the PIVC[1][5] when the suspension linkage is in an at least partially extended state to a position in front of the PIVC[1][5] when the suspension linkage is in an at least partially compressed state.
5. The two-wheel vehicle suspension linkage of claim 3 , wherein the link body- 6 has a longitudinal axis extending between the PIVC[3][6] and the PIVC[5][6], wherein the longitudinal axis is in a first position behind the IVC[1][5] when the suspension linkage is in an at least partially extended state and in a second position in front of the IVC[1][5] when the suspension linkage is in a partially compressed state.
6. The two-wheel vehicle suspension linkage of claim 1 , wherein the idler rotation axis is coincident to a PIVC defined by a combination of the suspended body 1 and, the wheel carrier body 2 , the link body 3 , the link body 4 , the link body 5 , or the link body 6 .
7. The two-wheel vehicle suspension linkage of claim 6 , wherein the idler is mounted to an axle, wherein the axle is pivotally connecting the wheel carrier body 2 , linkage body 3 , linkage body 4 , linkage body 5 , or linkage body 6 to suspended body- 1 .
8. The two-wheel vehicle suspension linkage of claim 1 , wherein the link body 3 includes jointed connections with:
the suspended body 1 defining a PIVC[1][3],
the link body 4 defining a PIVC[3][4], and
the link body 6 defining a PIVC[3][6];
the link body 4 includes a jointed connection with wheel carrier body 2 defining a PIVC[2][4];
the link body 5 includes jointed connections with:
the suspended body 1 defining a PIVC[1][5],
the wheel carrier body 2 defining a PIVC[2][5], and
the link body 6 defining a PIVC[5][6], wherein the idler rotation axis is not coincident to the PIVC[1][3].
9. The two-wheel vehicle suspension linkage of claim 8 , wherein the PIVC[1][3][7] is spaced apart from the idler rotation axis by a distance of less than or equal to 50-mm.
10. The two-wheel vehicle suspension linkage of claim 1 , wherein the idler comprises an idler cog.
11. The two-wheel vehicle suspension linkage of claim 1 , wherein at least one PIVC migration path reverses as the suspension linkage moves from an at least partially extended state to an at least partially compressed state.
12. The two-wheel vehicle suspension linkage of claim 1 , wherein the suspended body 1 includes:
a motive power source compartment, and
an energy storage compartment selectively coverable by a panel.
13. The two-wheel vehicle suspension linkage of claim 12 , further comprising:
a motive power source received in the motive power source compartment;
an energy storage module received in the energy storage compartment and contained by the panel;
an electrical conduit in electrical communication with the motive power source and the energy storage module and operative to supply electrical power from the energy storage module to the motive power source.
14. The two-wheel vehicle suspension linkage of claim 12 , wherein the idler rotation axis is coincident with a PIVC.
15. The two-wheel vehicle suspension linkage of claim 12 , wherein the idler rotation axis is not coincident with a PIVC.
16. The two-wheel vehicle suspension linkage of claim 1 , wherein the driving cog is rotatable about a driving cog axis and the idler rotation axis is disposed above and forward of the driving cog axis.
17. The two-wheel vehicle suspension linkage of claim 1 , wherein a contact angle formed between a forward vertical tangent of the driving cog and line that is tangent to both the driving cog and the idler is greater than zero degrees.
18. The two-wheel vehicle suspension linkage of claim 1 , further comprising an instantaneous force center (IFC) located at an intersection of a force vector of the elongated flexible member and a driving force vector, wherein as the suspension linkage moves between an extended and compressed state, the IFC moves from an extended position rearward to an intermediate position and then forward to compressed position.
19. The two-wheel vehicle suspension linkage of claim 18 , wherein the compressed position is forward of at least one of the extended position or the intermediate position.
20. The two-wheel vehicle suspension linkage of claim 1 , wherein an anti-squat percentage of the suspension linkage increases as a vertical travel of the wheel increases to a first position, wherein as the vertical wheel travel increases further to a second position, the anti-squat percentage falls.
21. The two-wheel vehicle suspension linkage of claim 1 , wherein a rate of change of a power transmitting length of the elongated flexible member (dPTL) increases as a vertical travel of the wheel increases to a first position, wherein as the vertical wheel travel increases further to a second position, the dPTL falls.
22. The two-wheel vehicle suspension linkage of claim 21 , wherein the dPTL is maximized near a sag point of the two-wheel vehicle suspension linkage.
23. The two-wheel vehicle suspension linkage of claim 21 , wherein the dPTL is maximized at a first value of the vertical travel of the wheel, and wherein the link body 3 has an inflection point at a second value of the vertical travel of the wheel greater than the first value.
24. A two-wheel vehicle suspension linkage comprising:
a suspended body 1 , and a plurality of link bodies including a wheel carrier body 2 , a link body 3 , a link body 4 , a link body 5 , and a link body 6 operatively coupled defining a primary instantaneous velocity center (PIVC) at each joint between the plurality of link bodies;
a driving cog having a driving cog diameter and operatively connected to the suspended body 1 , wherein the driving cog is rotatable in a driving cog center plane about a driving cog axis normal to the driving cog center plane, and a driving cog region is defined between:
a front driving cog plane tangent to a front of the driving cog diameter, parallel to the driving cog axis, and parallel to gravity, and
a rear driving cog plane tangent to a rear of the driving cog diameter, parallel to the driving cog axis, and parallel to gravity, wherein at least a portion of one or more of the plurality of link bodies is located inside the driving cog region and extends transversely outward past the driving cog center plane.
25. The two-wheel vehicle suspension linkage of claim 24 , further comprising a damper unit configured to resist movement between two or more of the suspended body 1 , the wheel carrier body 2 , the link body 3 , the link body 4 , the link body 5 , or the link body 6 .
26. A two-wheel vehicle suspension linkage comprising:
a suspended body 1 , and a plurality of link bodies including a wheel carrier body 2 , a link body 3 , a link body 4 , a link body 5 , and a link body 6 operatively coupled defining a primary instantaneous velocity center (PIVC) at each joint between the plurality of link bodies;
a driving cog operatively connected to the suspended body 1 and defining a driving cog axis of rotation, a driving cog radius, a driving cog center plane, and a driving cog region, wherein;
the driving cog region is defined between a front driving cog plane tangent to a front of the driving cog, parallel to the driving cog axis of rotation, and parallel to gravity and a rear driving cog plane tangent to a rear of the driving cog, parallel to the driving cog axis of rotation, and parallel to gravity,
a first distance from a suspended body center plane to a vertical reference plane of one or more of the plurality of link bodies normal to the driving cog axis is greater than a second distance from the suspended body center plane to the driving cog center plane, and
the first distance and the second distance are measured in the driving cog region;
wherein the link body 3 includes jointed connections with:
the suspended body 1 defining a PIVC[1][3],
the link body 4 defining a PIVC[3][4], and
the link body 6 defining a PIVC[3][6]; and
the link body 4 includes a jointed connection with wheel carrier body 2 defining a PIVC[2][4];
the link body 5 includes jointed connections with:
the suspended body 1 defining a PIVC[1][5],
the wheel carrier body 2 defining PIVC[2][5], and
the link body 6 defining an PIVC[5][6], wherein the driving cog radius is 40%-65% of a distance from the PIVC[1][3] to the driving cog axis of rotation.
27. The two-wheel vehicle suspension linkage of claim 26 further comprising a damper unit configured to resist movement between two or more of the suspended body 1 , the wheel carrier body 2 , the link body 3 , the link body 4 , the link body 5 , or the link body 6 .
28. A two-wheel vehicle suspension linkage comprising:
a suspended body 1 , and a plurality of link bodies including a wheel carrier body 2 , a link body 3 , a link body 4 , a link body 5 , and a link body 6 operatively coupled defining a primary instantaneous velocity center (PIVC) at each joint between the plurality of link bodies;
a driving cog operatively connected to the suspended body 1 and defining a driving cog radius, a driving cog axis of rotation, and a driving cog center plane, wherein a portion of the link body 4 is located outside the driving cog center plane in a vertical cross-sectional view of the two-wheel vehicle suspension linkage parallel to the driving cog axis of rotation and between a front driving cog plane and a rear driving cog plane, the front driving cog plane being tangent to a front of the driving cog, parallel to the driving cog axis of rotation, and parallel to gravity, the rear driving cog plane being tangent to a rear of the driving cog, parallel to the driving cog axis of rotation, and parallel to gravity;
wherein the link body 3 includes jointed connections with:
the suspended body 1 defining a PIVC[1][3],
the link body 4 defining a PIVC[3][4], and
the link body 6 defining a PIVC[3][6]; and
the link body 4 includes a jointed connection with wheel carrier body 2 defining a PIVC[2][4];
the link body 5 includes jointed connections with:
the suspended body 1 defining a PIVC[1][5],
the wheel carrier body 2 defining a PIVC[2][5], and
the link body 6 defining a PIVC[5][6], wherein the driving cog radius is 40%-70% of a distance from the PIVC[3][6] to the PIVC[5][6].
29. The two-wheel vehicle suspension linkage of claim 28 further comprising a damper unit configured to resist movement between two or more of the suspended body 1 , the wheel carrier body 2 , the link body 3 , the link body 4 , the link body 5 , or the link body 6 .
30. A two-wheel vehicle suspension linkage comprising:
a suspended body 1 ;
a wheel carrier body 2 ;
a wheel operatively connected to the wheel carrier body 2 ;
a driven cog operatively connected to the wheel;
a driving cog operatively connected to the suspended body 1 ;
an idler operatively connected to the suspended body 1 , wherein the idler is rotatable about an idler rotation axis; and
an elongated flexible member disposed along a route between the driving cog and the driven cog, wherein the idler is disposed in the route between the driving cog and the driven cog, wherein an instantaneous force center (IFC) is located at an intersection of a force vector of the elongated flexible member and a driving force vector, wherein as the suspension linkage moves between an extended and compressed state, the IFC moves from an extended position rearward to an intermediate position and then forward to compressed position, wherein an axis of the wheel in the compressed state is rearward of an axis of the wheel in the extended state.
31. The two-wheel vehicle suspension linkage of claim 30 further comprising a link body 3 , a link body 4 , a link body 5 , and a link body 6 operatively coupled with one another and the suspended body 1 and wheel carrier body 2 and defining a primary instantaneous velocity center (PIVC) at each joint between link bodies.
32. The two-wheel vehicle suspension linkage of claim 30 further comprising a damper unit configured to resist movement between two or more of the suspended body 1 , wheel carrier body 2 , link body 3 , link body 4 , link body 5 , or link body 6 .
33. A two-wheel vehicle suspension linkage comprising:
a suspended body 1 ;
a wheel carrier body 2 ;
a wheel operatively connected to the wheel carrier body 2 ;
a driven cog operatively connected to the wheel;
a driving cog operatively connected to the suspended body 1 ;
an idler operatively connected to the suspended body 1 , wherein the idler is rotatable about an idler rotation axis; and
an elongated flexible member disposed along a route between the driving cog and the driven cog, wherein the idler is disposed in the route between the driving cog and the driven cog, wherein a rate of change of a power transmitting length of the elongated flexible member (dPTL) increases as a vertical travel of the wheel increases to a first position, wherein as the vertical wheel travel increases further to a second position, the dPTL falls, wherein a driven wheel axis path of the wheel is rearward from a minimum vertical wheel travel to a maximum vertical wheel travel.
34. The two-wheel vehicle suspension linkage of claim 33 further comprising a link body 3 , a link body 4 , a link body 5 , and a link body 6 operatively coupled with one another and the suspended body 1 and wheel carrier body 2 and defining a primary instantaneous velocity center (PIVC) at each joint between link bodies.
35. The two-wheel vehicle suspension linkage of claim 33 further comprising a damper unit configured to resist movement between two or more of the suspended body 1 , wheel carrier body 2 , link body 3 , link body 4 , link body 5 , or link body 6 .