Multi-surface rim for enhanced efficiency
Embodiments described herein provide for one or more of: (1) airflow enhancement around a rim using cusps that create virtual surfaces of air with the bike in motion, which also encourage favorable air attachment around the rim; (2) wake reduction by streamlining the airfoil around the rim using trip edges at various points of rim surface transition, which cause a laminar flow to go turbulent for enhancing the streamline effect; (3) a double rim surface, which provides an air slot between the two rim surfaces at a distance that enhances flow attachment and adds energy of air flow around the rim by moving air between areas of high and low pressure; and (4) a tubeless tire rim kit capable of converting conventional rims into tubeless ones and also promoting the sealing of the tire to the rim with minimal air pressure necessary to create the seal.
1. A human powered vehicle multi-surface rim comprising:
an outer section of the multi-surface rim that includes a tire engaging portion located at an outward perimeter of the outer section of the rim, an inner portion located radially inward from the tire engaging portion, and two air engaging side surfaces extending radially between the tire engaging portion and the inner portion and forming axially opposing sides of the outer section of the multi-surface rim;
one or more airfoil inner sections of the multi-surface, wherein each inner section includes an outward portion and an inward portion with two air engaging side surfaces extending radially between each outward portion and inward portion to form axially opposing sides of an airfoil shape for each inner section;
wherein the one or more inner sections are located radially inward from the outer section and spaced separately from the outer section at a distance for allowing airflow to move between high and low pressure sides of at least the outer section and one of the one or more inner sections of the rim in promoting airflow attachment at the trailing edges of the outer and inner surface sections; and
a plurality of spokes connecting the inner portion of the outer section to the outward portion of the one of the one or more inner sections of the rim.
2. The human powered vehicle multi-surface rim of claim 1 , wherein the outer section is held in contact with at least one of the one or more inner sections by two or more narrow joining struts.
3. The human powered vehicle multi-surface rim of claim 2 , wherein the at least one of the one or more inner airfoil sections is held in contact with a hub by two or more narrow joining struts.
4. The human powered vehicle multi-surface rim of claim 2 , wherein the at least one of the one or more inner airfoil sections is held in contact with a hub by a single solid section.
5. The human powered vehicle multi-surface rim of claim 1 , wherein a slot is defined between the inner portion of the outer section and the outward portion of the inner section to reduce drag.
6. The human powered vehicle multi-surface rim of claim 1 , further comprising:
a tire attached to the tire engaging portion of the outer section; and
a hub joined to one of the inner sections.
7. The human powered vehicle multi-surface rim of claim 6 , further comprising a tri-spoke system attaching the inner section to the hub.
8. The human powered vehicle multi-surface rim of claim 6 , further comprising wire spokes connecting the inner section to the hub.
9. The human powered vehicle multi-surface rim of claim 6 , wherein the inner section is a solid unit attached to the hub.
10. A multi-surface bicycle rim, comprising:
an outer rim including
a tire engagement portion configured to engage a tire,
an inner engaging portion located radially inwards from the tire engagement portion, and
a pair of outer rim sidewalls extending in a bowed manner from the tire engagement portion to the inner engaging portion;
an inner rim attached to the outer rim at a position location radially inwards to the outer rim, the inner rim including
an outer rim engagement portion spaced apart from the inner engaging portion of the outer rim, and
at least one inner rim sidewall extending in a bowed manner from the outer rim engagement portion;
wherein the outer rim and the inner rim define a slot between the inner engaging portion of the outer rim and the outer rim engagement portion of the inner rim to enhance flow attachment; and
a plurality of spokes extending in the slot from the inner engaging portion of the outer rim to the outer rim engagement portion of the inner rim.
11. The bicycle rim of claim 10 , wherein a total distance along one side of the outer rim and the inner rim is more than a conventional 100 mm rim.
12. The bicycle rim of claim 10 , further comprising:
a hub; and
a tri-spoke system attaching the inner rim to the hub.
13. The bicycle rim of claim 10 , further comprising:
a hub; and
wire spokes connecting the inner rim to the hub.
14. The bicycle rim of claim 10 , further comprising:
a hub; and
the inner rim being a solid unit attached to the hub.
15. A multi-surface bicycle rim, comprising:
an outer rim surface having
a tire engagement portion configured to engage a tire,
an inner engaging portion located radially inwards from the tire engagement portion, and
a pair of outer rim sidewalls extending in a bowed manner from the tire engagement portion to the inner engaging portion;
an inner rim surface located radially inwards from the outer rim surface, the inner rim surface having
an outer rim engagement portion spaced apart from the inner engaging portion of the outer rim surface to define a slot in between, and
at least one inner rim sidewall extending in a bowed manner from the outer rim engagement portion; and
a plurality of spokes extending in the slot from the inner engaging portion of the outer rim surface to the outer rim engagement portion of the inner rim surface, wherein the spokes secure the outer rim surface to the inner rim surface in a concentric manner.
16. The bicycle rim of claim 15 , wherein a total distance along one side of the outer rim and the inner rim is more than a conventional 100 mm rim.
17. The bicycle rim of claim 15 , further comprising:
a hub; and
inner spokes connecting the inner rim surface to the hub.
18. The bicycle rim of claim 15 , wherein the outer rim surface and the inner rim surface each have a toroidal shape.
19. The bicycle rim of claim 15 , wherein the slot extends in a concentric manner between the outer rim surface and the inner rim surface.