Bicycle wheel rim and wheel comprising it

Patent metadata

Field	Value
Publication number	US-2019105944-A1
Application number	US-201816156242-A
Country	US
Kind code	A1
Filing date	Oct 10, 2018
Priority date	Oct 11, 2017
Publication date	Apr 11, 2019
Grant date	—

Abstract

A rim of a bicycle wheel with a wall that, viewed in a radial section, extends along a closed line enclosing at least one annular cavity that is concentric with the rim. Partitioning the rim in three slices of equal size along the axis of rotation yields wall projections that have axially central portions that extend radially outwards to a greater extent than axially outer portions.

First claim

What is claimed is:

1 . A rim of a bicycle wheel comprising a wall that, viewed in a radial section, extends along a closed line enclosing at least one annular cavity concentric with the rim, and wherein, considering a partition of the rim in three slices of equal size along an axis of rotation (X-X), said wall projects radially outwards to a greater extent in an axially central slice than in axially outer slices.

2 . The rim according to claim 1 , wherein a first radially outer region of the wall is overall radially convex outwards.

3 . The rim according to claim 2 , wherein a second radially outer region of the wall, coinciding with or contained within the first radially outer region, follows, viewed in the radial section, an arc of circumference centered at a reference point (Y).

4 . The rim according to claim 3 , wherein the radial section of the rim at least partially follows an aerodynamically efficient profile, and wherein said arc of circumference of the second radially outer region is an arc of the nose circle.

5 . The rim according to claim 1 , wherein the wall has a textured outer surface, in particular rough, at least at a third radially outer region.

6 . The rim according to claim 1 , wherein said rim, at least at a third radially outer region, has a coating with greater rolling friction than a naked surface of the rim.

7 . The rim according to claim 5 , wherein the third radially outer region subtends an angle (BETA) comprised in the range between 10° and 160°, having said reference point (Y) as a vertex.

8 . The rim according to claim 6 , wherein the coating has a thickness (S) that is higher in said third radially outer region than in a fourth radially outer region, and the fourth radially outer region is wider than the third radially outer region.

9 . The rim according to claim 8 , wherein the fourth radially outer region subtends an angle (GAMMA) comprised in the range between 20° and 270°, having said reference point (Y) as a vertex, and the coating consists of a single strip fixed onto an exposed face of the fourth radially outer region of the rim.

10 . The rim according to claim 6 , wherein the coating is fixed onto the rim through gluing.

11 . The rim according to claim 6 , wherein an exposed face of the third radially outer region comprises a shaping configured to enable gluing of the coating.

12 . The rim according to claim 11 , wherein the shaping comprises at least one circumferential channel, and more preferably at least two circumferential channels, parallel to and spaced from one another.

13 . The rim according to claim 6 , wherein the radial section of the rim provided with the coating at least partially follows an aerodynamically efficient profile approximating an NACA airfoil, and wherein said coating follows an arc of circumference that is an arc of a nose circle.

14 . A bicycle wheel comprising a rim according to claim 1 .

15 . The bicycle wheel according to claim 14 , wherein said wheel is a lenticular or disc wheel, further comprising a hub and a pair of disc-shaped elements that connect the rim to the hub, wherein said wheel at least partially follows, in an axial section, an aerodynamically efficient profile, wherein the aerodynamically efficient profile of the lenticular or disc wheel follows, in a radially outer region, a symmetrical NACA airfoil.

16 . The bicycle wheel according to claim 14 , wherein said wheel is of the spider wheel, further comprising a hub and a plurality of structural elements that connect the rim to the hub, wherein each structural element has a cross section of that is a symmetrical NACA airfoil.

17 . The rim according to claim 1 , wherein the first radially outer region of the wall follows, viewed in a radial section, a curve having a convexity radially outwards the outside.

18 . The rim according to claim 2 , wherein a second radially outer region of the wall, coinciding with or contained within the first radially outer region, follows, viewed in the radial section, an arc of circumference centered at a reference point (Y), which subtends an angle (ALFA) comprised in a range between 5° and 120°.

19 . The rim according to claim 3 , wherein the radial section of the rim at least partially follows an aerodynamically efficient NACA profile, and wherein said arc of circumference of the second radially outer region is an arc of a nose circle.

20 . The rim according to claim 5 , wherein the third radially outer region subtends an angle (BETA) in the range between 90° and 150°, having said reference point (Y) as a vertex.

Assignees

• Campagnolo Srl

Inventors

• Meggiolan Mario

Classifications

• B60B21/10

  characterised by the form of tyre-seat or flange, e.g. corrugated (B60B21/02 takes precedence) · CPC title

• B60B9/00

  Wheels of high resiliency {, e.g. with conical interacting pressure-surfaces (resilient wheels comprising rail-engaging elements B60B17/0027)} · CPC title

• B60B2900/311

  Rigidity or stiffness · CPC title

• B60B1/041

  of bicycle wheels (bicycle rims characterised by means for attaching spokes B60B21/062) · CPC title

• B60B1/0261

  characterised by spoke form · CPC title