Bicycle frame with vibration isolation
A bicycle can include a frame. The frame can include a front steering axle, a front fork assembly, and a handlebar assembly for steering a front wheel of the bicycle. The bicycle can also include one or more vibration isolators. The one or more vibration isolators can be operatively connected to at least one of the frame, the front steering axle, the front fork assembly, and the handlebar assembly. The one or more vibration isolators can also be configured to exhibit a non-linear stiffness profile including a region of quasi-zero stiffness. As a result, the one or more vibration isolators isolate a rider of the bicycle from vibrations transferred through the frame.
1 . A bicycle, comprising:
a frame including a front steering axle, a front fork assembly, and a handlebar assembly for steering a front wheel of the bicycle and including a handlebar stem device including first and second swing arms operatively connected to a mounting shaft; and
one or more vibration isolators located internally within and directly connected to the frame, pre-compressed to an operational load prior to installation to the frame, and configured to exhibit a non-linear stiffness profile including a region of quasi-zero stiffness, the one or more vibration isolators including a handlebar stem device vibration isolator operatively connected to at least one of the first and second swing arms, whereby the one or more vibration isolators isolate a rider of the bicycle from vibrations transferred through the frame and the handlebar assembly.
2 . The bicycle of claim 1 , wherein the one or more vibration isolators include a frame vibration isolator operatively connected to the frame, and wherein the frame vibration isolator is configured to isolate the rider from vibrations transferred through the frame.
3 . The bicycle of claim 1 , wherein the one or more vibration isolators include a front steering axle vibration isolator operatively connected to the front steering axle, and wherein the front steering axle vibration isolator is configured to isolate the rider from vibrations transferred through the front steering axle.
4 . The bicycle of claim 1 , wherein the front fork assembly includes a first front fork and a second front fork, wherein the one or more vibration isolators include a first front fork vibration isolator operatively connected to the first front fork and a second front fork vibration isolator operatively connected to the second front fork, wherein the first front fork vibration isolator and the second front fork vibration isolator are configured to isolate the rider from vibrations transferred through the front fork assembly.
5 . The bicycle of claim 1 , wherein the one or more vibration isolators include a stack of a plurality of conical springs arranged in an alternating pattern, wherein each of the plurality of conical springs includes an outer diameter body portion and an inner diameter body portion, and wherein, for each of the plurality of conical springs, at least one of:
the outer diameter body portion faces the outer diameter body portion of a neighboring one of the plurality of conical springs; and
the inner diameter body portion faces the inner diameter body portion of a neighboring one of the plurality of conical springs.
6 . The bicycle of claim 5 , wherein the one or more vibration isolators include a plurality of inner spacers, wherein the plurality of inner spacers separate the inner diameter body portion of a neighboring pair of the conical springs, and wherein the plurality of inner spacers engage the inner diameter body portion of the neighboring pair of the conical springs.
7 . The bicycle of claim 5 , wherein the one or more vibration isolators include a plurality of outer spacers, wherein the outer spacers separate the outer diameter body portion of a neighboring pair of the conical springs, and wherein the plurality of outer spacers engage the outer diameter body portion of the neighboring pair of the conical springs.
8 . The bicycle of claim 1 , wherein the operational load corresponds to a weight of a body portion of a rider of the bicycle associated with the one or more vibration isolators.
9 . A bicycle, comprising:
a frame including a front-end having a front steering axle, a front fork assembly, and a handlebar assembly for steering a front wheel of the bicycle and including a handlebar stem device including first and second swing arms operatively connected to a mounting shaft; and
one or more vibration isolators located internally within and directly connected to the frame, pre-compressed to an operational load prior to installation to the frame, and configured to exhibit a non-linear stiffness profile including a region of quasi-zero stiffness, and the one or more vibration isolators including:
a frame vibration isolator operatively connected to the frame;
one or more front-end vibration isolators operatively connected to at least one of the front steering axle, the front fork assembly, and the handlebar assembly; and
a handlebar stem device vibration isolator operatively connected to at least one of the first and second swing arms, whereby the frame vibration isolator, the one or more front-end vibration isolators, and the handlebar stem device vibration isolator are configured to synergistically isolate different body portions of a rider of the bicycle from vibrations transferred through the frame and the handlebar assembly.
10 . The bicycle of claim 9 , wherein the frame vibration isolator is configured to isolate a lower body portion of the rider from vibrations transferred through the frame.
11 . The bicycle of claim 9 , wherein the one or more front-end vibration isolators include a front steering axle vibration isolator operatively connected to the front steering axle, and wherein the front steering axle vibration isolator is configured to isolate an upper body portion of the rider from vibrations transferred through the front steering axle.
12 . The bicycle of claim 9 , wherein the front fork assembly includes a first front fork and a second front fork, wherein the one or more front-end vibration isolators include a first front fork vibration isolator operatively connected to the first front fork and a second front fork vibration isolator operatively connected to the second front fork, wherein the first front fork vibration isolator and the second front fork vibration isolator are configured to isolate an upper body portion of the rider from vibrations transferred through the front fork assembly.
13 . The bicycle of claim 9 , wherein the one or more vibration isolators include a stack of a plurality of conical springs arranged in an alternating pattern, wherein each of the plurality of conical springs includes an outer diameter body portion and an inner diameter body portion, and wherein, for each of the plurality of conical springs, at least one of:
the outer diameter body portion faces the outer diameter body portion of a neighboring one of the plurality of conical springs; and
the inner diameter body portion faces the inner diameter body portion of a neighboring one of the plurality of conical springs.
14 . The bicycle of claim 13 , wherein the one or more vibration isolators include a plurality of inner spacers, wherein the plurality of inner spacers separate the inner diameter body portion of a neighboring pair of the conical springs, and wherein the plurality of inner spacers engage the inner diameter body portion of the neighboring pair of the conical springs.
15 . The bicycle of claim 13 , wherein the one or more vibration isolators include a plurality of outer spacers, wherein the outer spacers separate the outer diameter body portion of a neighboring pair of the conical springs, and wherein the plurality of outer spacers engage the outer diameter body portion of the neighboring pair of the conical springs.
16 . The bicycle of claim 9 , wherein the operational load corresponds to a weight of a body portion of a rider of the bicycle associated with the one or more vibration isolators.
17 . A bicycle, comprising:
a frame including a front steering axle, a front fork assembly, and a handlebar assembly for steering a front wheel of the bicycle and including a handlebar stem device including first and second swing arms operatively connected to a mounting shaft; and
a plurality of vibration isolators each located internally within and directly connected to the frame, pre-compressed to an operational load prior to installation to the frame, and configured to exhibit a non-linear stiffness profile including a region of quasi-zero stiffness, and the plurality of vibration isolators including:
a frame vibration isolator operatively connected to the frame;
a front steering axle vibration isolator operatively connected to the front steering axle;
two front fork vibration isolators each operatively connected to the front fork assembly;
one or more handlebar assembly vibration isolators each operatively connected to the handlebar assembly; and
a handlebar stem device vibration isolator operatively connected to at least one of the first and second swing arms, whereby the plurality of vibration isolators are configured to synergistically isolate an upper body portion and a lower body portion of a rider of the bicycle from vibrations transferred through the frame and the handlebar assembly.
18 . The bicycle of claim 17 , wherein the operational load corresponds to a weight of a body portion of a rider of the bicycle associated with the plurality of vibration isolators.