ES1171558U - Semilenticular bilaminar device for bicycle wheel (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Two-layered bilaminar device for bicycle wheel, characterized in that it consists of two balanced, rigid or semi-rigid laminar elements, in the form of a comma or scythe, slightly convex on its external face, equidistant from each other and fixed on the vertical pianos formed by the spokes with respect to the horizontal axis, which rest on the inner circle of the rim and progressively expand towards the axis, allowing a central opening in the form of s, with a specific design and proportions (1). (Machine-translation by Google Translate, not legally binding)

Description

SEMILENTICULAR BILAMINARY DEVICE FOR BIKE WHEEL

OBJECT OF THE INVENTION

The present utility model, as expressed in the statement of the specification refers to a bilaminar device adaptable to the wheel of the bicycle with the aim of facilitating the march of the cyclist.

TECHNICAL SECTOR

Aerodynamics wheel bicycle. Inertia wheel Laminar adaptations for bicycle wheel.

BACKGROUND OE THE INVENTION

The aerodynamic drag generated by the cyclist himself represents 75% of it, while the bicycle occupies 25%. In this second section, the adaptations to reduce wind resistance include aerodynamic modifications to the wheels, since these changes represent a significant difference in the competition, compared to the wheels with spokes without this profile (1). The utility of lenticular wheels and lenticular laminar adaptations in conventional bicycle wheels is currently recognized.

1.-Lenticular wheels:

The lenticular wheels reduce the turbulent air flow generated by the cyclist himself, the bidclette and the cross winds, reducing aerodynamic drag and facilitating the speed of travel. The tests performed in wind tunnels have shown that the aerodynamic wheels at speeds of 4O-45Km / h. they achieve energy savings of around 3% to 4%., which represents between 2 and 3 minutes in a 4úKm competition. (one). Most of the afflicted athletes are able to develop speeds between 30-33Km./h., so their energy savings would be between 1% and 3%.

The studies currently available indicate that lenticular wheels improve the aerodynamics of the cyclist even with crosswinds; their greater stability is due to the fact that they delay the pressure center by adding more posterior surface and a push towards the ground. However, its high price limits its use in sports.

disc wheels have undergone an evolution; initially they were of two types: planes of parallel oval lenticular V faces; later the mixed profile disc has been incorporated, more clustered near the rim, less rigid, capable of reducing aerodynamic drag even further, offering greater ride comfort. The flocked design discs have achieved a reduction in aerodynamic drag as the angle of incidence of the wind increases (2).

2.-Lenticular laminar adaptations for conventional wheels:

Lenticular laminar adaptations are recognized as useful elements characterized by incorporating covers on a conventional wheel, it becomes a lenticular laminar wheel. Aerodynamic effects approximate those offered by a full oval lenticular wheel. The wind tunnel tests show that correctly installed, with a good fit between the cover and the tire, they behave in an equivalent way to the new aglobados discs, with little penalty for their slight increase in weight and with a good relationship between cost and performance (3, 4).

At present it is considered that laminar adaptations with covers on the rear wheel represent a good alternative to improve aerodynamics, offering the following technical advantages:

•

They get a lower drag than a wheel without covers.

•

They have an aerodynamic behavior similar to the disks at all angles of wind incidence.

•

The wheel with lenticular profile of covers even presents a negative resistance or previous thrust when the incidence of 'wind approaches 20 degrees (2).

Our utility model is a device composed of two fixed blades placed as blades or ~ Iabes, for adaptation in conventional bicycle wheels.

The available basic results show two favorable effects, one aerodynamic similar to the lenticular laminar adaptations and another complementary pulsatile kinetic impulse related in its design and the distribution of its masses in a specific way.

Bibliography

1.-Sportraining magazine. May / June 2010. http://www.sportraining.es/sportraining!

2.-Disks and covers: Aerodynamic behavior. www.amtriathlon.com/2010/09/discos-y-tapas.html

3.-Aerojacket Disc Cover Aerodynamic Testing. http://www.wheelbuilder.com/store/aero-disc-covers.html

4.-Lenticular adaptations. Laminar Cover. http://www.idec.aero/laminarcover/

DESCRIPTION OF THE INVENTION

It is a semilanticular bilaminar device, open around the horizontal axis and adaptable to conventional bicycle wheels, with the aim of facilitating the performance of the cyclist.

The device consists of two blades, blades or blades that are fixed eccentrically on the vertical planes to the ejE ~ formed by the spokes of the wheel to obtain an aerodynamic and centrifugal benefit (Figure 1). The shape and specific design of the blades allow to reduce the aerodynamic resistance of the wind against it as a full-lenticular lenticular wheel and obtain in addition a pulsatile pulse of additional inertia that favors the march when it synchronizes with our rhythm of pedaling.

The sheets of the device can be constructed with one or several layers superimposed on each other to embrace the spokes, made of light, rigid materials (eg carbon sheets) or semi-rigid (eg polypropylene sheets) (Figure 2). The two fixed laminar elements are mounted equidistant V eqUilibrados in their distribution of masses, being adjusted to the inner circle of the rim (eg: self-adhesive vinyl). Both sheets extend and widen progressively over at least 1/3 of the length of the inner circumference of the rim (figure 3).

The design of the two blades, blades or blades has a specific shape in a coma or guadai '\ a. The sharpest angle of each l; ~ mine has an anterior orientation, in the direction of travel, and its more extreme end is posterior.

In its vertical extension, each sheet widens progressively towards the horizontal axis of the wheel until it occupies at its rear end, at least 2/3 of the inner radius of the tire (figure 3).

The final result allows an open space around the horizontal central axis of the wheel, acquiring a characteristic central morphology open in "S" (figures 3).

the fixing of the two bilaminams devices is carried out on the radii affected by the sheets (eg by flat head flanges or other secure fasteners) (figure 4). It is completed with an adhesive vinyl that continues on both sides of the rim, respecting the 'braking track.

The facilitating effect obtained with the semilenticular bilaminar device is directly related to the relative speed of the cyclist, this being: the speed of movement of the bicycle + the wind speed against.

• The wheel with semilanticular bilaminar device decreases the aerodynamic resistance as a lenticular laminar wheel to which a kinetic pulsating pulse is added when the relative speed exceeds 25Km./h., Increasing

progressively in frequency until it !; SOKm./h., Without causing significant noise and maintaining the cyclist's stability correctly.

•

It maintains the center of pressure of the bicycle in a posterior situation, with kinetic impulses in the anterior and inferior direction, so that it increases the stability of the ride even in cross-wind conditions.

•

The construction process requires less materials, so both its weight and production cost are lower.

•

The assembly is simpler than that required for a complete lenticular laminar adaptation, since it does not require disassembly of the pinions. The assembly can be carried out even by the user himself following the instructions of a specific assembly guide or by specialized mechanical personnel.

•

It is adaptable to any model of conventional bicycle wheel, although its preferred utility is centered on the rear wheel of the road bike; its incorporation in the front wheel presents problems in the control of the steering when it receives changing cross winds, as well as in the approach and crossings with heavy vehicles, so its adaptation to the two wheels is reserved for closed track spaces to road traffic .

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a front view of the bilaminar device object of the invention (drawn in black), 1.-view of the device on the rear wheel and 2.-view of the device on the front wheel. Fixed adaptations and on vertical oblique planes formed by the radii with opening around "the axis.

Figure 2 shows the composition of a double-sided sheet of the bilaminar device object of the invention, both sides rotate on a vertical axis to form a superimposed laminar structure that includes the related radii.

Figure 3 shows a side view of the bilaminar device object of the invention in which its specific design of the sheets is appreciated: comma or guadai'ia shape and central opening in "S" on the horizontal axis and relations with the components of the wheel, 1.-circle corresponding to the chamber, 2.-the brake track of the tire. 3. First laminar adaptation with specific design respecting the braking track. 4. outer side of the tire. 5.-Second laminar adaptation and its wide rear end that occupies at least 2/3 of the internal radius.

Figure 4 shows a side view of the bilaminar device object of the invention mounted on the wheel, with the location (in white circles) of the fixing points of the safety elements (eg flat flanges), on the proximal and distal ends of the Radios affected by each sheet.

DESCRIPTION OF AN FDRM ~, OF PREFERRED REALlZAClDN

In the realization of the semilanticular bilaminar device for a bicycle wheel, two aspects are taken into account: a.-Construction elements and b.-Information elements.

a.-Construction elements: It consists of two rigid laminar pieces (eg laminar carbon) or semi-rigid (eg polypropylene), each formed by a single single sheet or a double sheet composed of two faces that can be self-adhesive between yes or by a single piez. 3 foldable on itself (eg polypropylene sheets thick O'S / O 'amm.). the two elements that constitute the sheet overlap and include the related radii between their faces (figure 2). The length of each sheet on the inner circumference of the rim occupies at least 1/3 of its total length and its maximum post width: Rior in the vertical plane must extend at least 2/3 of the radius of the circumfen ~ ncia (figure 3).

Fixing on the affected radii is preferably carried out at their ends, for which flat head flanges or other secure fasteners can be used (figure 3); a preferred lamination with self-adhesive vinyl can cover the sheets in a personalized way by completing the adjustment of the sheet with the side face of the rim, respecting the braking band.

Once the assembly is carried out, the two equidistant sheets are balanced between each other and the kinetic impulse generated with the rotation of the wheel is evaluated.

b.-Information elements: They comprise two complementary practical guides: an easy assembly guide for the user and assembler, together with a device guide in the practice of bicycle touring.

Claims (4)

1.-Bilaminar semilenticular device for a bicycle wheel, characterized in that it is composed of two balanced, rigid or semi-rigid laminar elements, in the form of a comma or scythe, slightly convex on its external face, equidistant from each other and fixed on the vertical pianos formed by the radii with respect to the horizontal axis, which rest on the inner circle of the rim and widen progressively towards the axle, allowing an S-shaped central opening, with a specific design and proportions (1).

2.

- Bilaminar semilenticular device for a bicycle wheel, according to claim 1, characterized in that it is preferably formed by two parts superimposed on each other, which are fixed by hugging the related spokes (2).

3.

- Bilaminar semilenticular device for bicycle wheel, according to claim 1 characterized by its design in the form of a coma or scythe, with its acute angle located in the direction of travel and progressively widening backwards with slight convexity on its external face (3) .

Four.

- Bilaminar semilenticular device for bicycle wheel, according to the

claim 1 characterized in that it has specific proportions, extending over the inner circumference of the rim by a length equal to or greater than 1/3 part thereof, while its rear wide end extends vertically occupying at least 2/3 parts of the radius, in such a way that The semilenticular bilaminar device has an "S" opening on the horizontal axis (3,4).