Bicycle rear suspension system
A bicycle may include a front triangle and a rear suspension system that couples the front triangle to a rear wheel and is dampened by at least one shock absorber. The rear suspension system includes a six-bar linkage having two ternary links separated from each other by one or more binary links, such that the two ternary links do not share a common joint. One of the ternary links may comprise a chain stay. In some examples, the other ternary link may comprise the front triangle. In some examples, the other ternary link may comprise a rocker arm coupling a seat stay link to the shock absorber.
1. A bicycle comprising:
a bicycle frame; and
a rear suspension system coupling the bicycle frame to a rear wheel, the rear suspension system in combination with the frame comprising a six-bar linkage, the six-bar linkage including:
a chain stay link comprising a first ternary link coupled at a front end portion by a first joint to a first binary link and by a second joint to a second binary link, and coupled at a rear end portion by a third joint to a seat stay link comprising a third binary link;
a fourth binary link coupled by a fourth joint to the seat stay link;
wherein the first binary link is coupled to the bicycle frame by a fifth joint, the second binary link is coupled to the bicycle frame by a sixth joint, and the fourth binary link is coupled to the bicycle frame by a seventh joint, such that the bicycle frame is a second ternary link of the six-bar linkage; and
a shock absorber coupling the fourth binary link to the bicycle frame;
wherein the first binary link is disposed below the second binary link; and
wherein the rear wheel is rotatably coupled to the seat stay link of the rear suspension system.
2. The bicycle of claim 1 , wherein the fourth binary link extends forward of the seventh joint, such that the fourth binary link comprises a rocker arm coupled on one side of the seventh joint to the seat stay link and on another side of the seventh joint to the shock absorber.
3. The bicycle of claim 1 , wherein the rear wheel is rotatably coupled to the seat stay link proximate the third joint.
4. The bicycle of claim 3 , wherein the rear wheel is coupled to the seat stay link by a rotating joint that is offset from the third joint by at most approximately 200 mm.
5. The bicycle of claim 1 , wherein the seventh joint is on a seat tube of the bicycle frame, and the shock absorber is oriented parallel to the seat tube.
6. The bicycle of claim 1 , wherein the first and second joints of the chain stay link are spaced closer to each other than are the fifth and sixth joints.
7. The bicycle of claim 1 , wherein the first and second binary links have a same length.
8. The bicycle of claim 7 , wherein the first binary link is interchangeable with the second binary link without altering a behavior of the suspension.
9. The bicycle of claim 7 , wherein the first binary link and the second binary link are identical to each other.
10. A bicycle comprising:
a bicycle frame; and
a rear suspension system coupling the bicycle frame to a rear wheel, the rear suspension system in combination with the frame comprising a six-bar linkage, the six-bar linkage including:
a chain stay link comprising a first ternary link coupled at a front end portion by a first joint to a first binary link and by a second joint to a second binary link, and coupled at a rear end portion by a third joint to a seat stay link comprising a third binary link;
a fourth binary link coupled by a fourth joint to the seat stay link;
wherein the first binary link is coupled to the bicycle frame by a fifth joint, the second binary link is coupled to the bicycle frame by a sixth joint, and the fourth binary link is coupled to the bicycle frame by a seventh joint, such that the bicycle frame is a second ternary link of the six-bar linkage; and
a shock absorber coupling the fourth binary link to the bicycle frame;
wherein the first binary link is disposed below the second binary link; and
wherein when the shock absorber transitions from an uncompressed state to a fully compressed state, overall rotation of the first binary link is in an opposite direction with respect to overall rotation of the second binary link.
11. The bicycle of claim 10 , wherein the rear wheel is coupled to the rear suspension system at a rotational joint of the seat stay link.
12. The bicycle of claim 11 , wherein the rear wheel is rotatably coupled to the seat stay link proximate the third joint.
13. The bicycle of claim 12 , wherein the rear wheel is coupled to the seat stay link by a rotating joint that is offset from the third joint by at most approximately 200 mm.
14. The bicycle of claim 10 , wherein the fourth binary link extends forward of the seventh joint, such that the fourth binary link comprises a rocker arm coupled on one side of the seventh joint to the seat stay link and on another side of the seventh joint to the shock absorber.
15. The bicycle of claim 10 , wherein the seventh joint is on a seat tube of the bicycle frame, and the shock absorber is oriented parallel to the seat tube.
16. The bicycle of claim 10 , wherein the first and second joints of the chain stay link are spaced closer to each other than are the fifth and sixth joints.
17. The bicycle of claim 10 , wherein the first and second binary links have a same length.
18. The bicycle of claim 17 , wherein the first binary link is interchangeable with the second binary link without altering a behavior of the suspension.
19. The bicycle of claim 17 , wherein the first binary link and the second binary link are identical to each other.