Method for the Manufacture of a Wire Wheel and a Wheel Obtained by that Method

Abstract

A method for the manufacture of a wire wheel of the type comprising a rim and a hub secured to each other by a plurality of spokes. Each spoke includes a stem at the opposed axial ends of which are arranged respective anchorage members capable of being secured respectively to the hub and to the rim. The member for anchorage to the rim is received in a seat fixed on the rim with the capability of limited axial displacement in the seat. The seat is provided integrally on the rim in the form of a substantially tubular appendage thereof and the anchorage member is received in a sealed manner with coupling of the cylinder/piston type in the tubular appendage.

Description

TECHNICAL FIELD OF THE INVENTION

The subject of the present invention is a method for the manufacture of a wire wheel and a wheel obtained by the method.

STATE OF THE ART

The invention refers in particular to the production of wheels of the type comprising a rim and a hub secured to each other by a plurality of spokes. Each spoke includes a stem at the opposed axial ends of which are arranged respective anchorage members capable of being secured respectively to the hub and to the rim. The member for anchorage to the rim is received in a seat fixed on the rim with the capability of limited axial displacement in the seat.

Wheels having such features may be produced with characteristics suitable for the fitting of tubeless tires. Such wheels are taught, for example, in International Patent Publication No. WO 2005/058613 filed on behalf of the same applicants. The teaching is based on the fact that, in order to produce wheels suitable for the fitting of that type of tire, it is necessary on the one hand to produce a gas-tight coupling between the spoke part which hooks onto the rim and the rim itself, and on the other hand it is necessary take into account the fact that the rim, in use, is subject to inevitable elastic deformation which must be transferred to, and/or absorbed by, the rim-and-spoke assembly without prejudicing the gas-tight seal.

SUMMARY OF THE INVENTION

The invention is placed in that context by providing a method for the manufacture of a wire wheel which makes it possible to produce such wheels in a simplified manner compared with the previous teachings of the same applicants and with greater economy. To meet these and other objects, and in view of its purposes, the present invention provides a method for the manufacture of a wire wheel of the type comprising a rim and a hub secured to each other by a plurality of spokes. Each spoke includes a stem at the opposed axial ends of which are arranged respective anchorage members capable of being secured respectively to the hub and to the rim. The member for anchorage to the rim is received in a seat fixed on the rim with the capability of limited axial displacement in the seat. The seat is provided integrally on the rim in the form of a substantially tubular appendage thereof and the anchorage member is received in a sealed manner with coupling of the cylinder/piston type in the tubular appendage.

It is to be understood that both the foregoing general description and the following detailed description are exemplary, but are not restrictive, of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics and advantages of the invention will become clearer from the detailed description of two preferred, but not exclusive, examples of application thereof, illustrated by way of non-limiting example with reference to the appended drawings, in which:

FIG. 1 is a partial diagrammatic view in longitudinal section of a first exemplary embodiment of a wire wheel according to the present invention; and

FIG. 2 is a similar partial diagrammatic view in longitudinal section of a second exemplary embodiment of a wire wheel according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

In the drawings, details that are analogous or technically equivalent are designated by the same reference numbers. The reference 1 indicates as a whole a wire wheel including a rim 2 and a hub 3 interconnected with each other by a plurality of spokes, indicated by 4a in FIG. 1 and by 4b in FIG. 2.

Both the spokes 4a and the spokes 4b comprise a predominantly longitudinal stem, at the longitudinally opposed ends of which are arranged respective members for anchorage to the rim 2 and to the hub 3, indicated in both cases by reference numbers 5 and 6, respectively.

The two types of spokes 4a, 4b differ from each other. In the first case, the stem is produced integrally with the member 5 for anchorage to the rim 2. In the second case, the stem is produced integrally with the member 6 for anchorage to the hub 3.

In both cases, the member 5 for anchorage to the rim 2, and the corresponding complementary element 7 for anchorage on the rim 2 itself, have an identical configuration.

The spoke 4a lends itself more to the production of spokes with a stem made of a light alloy, such as aluminium alloy and the like. The spoke 4b lends itself more to the production of spokes with a stem made of steel.

The member 5 for anchorage to the rim 2 comprises a cylindrical tang 10 with an operating key 11 at its free end, followed by an annular shoulder 12 against which bears a second shoulder formed by a snap ring 13 lodged in a corresponding seat 14. In an intermediate position between the shoulders 12, 13 a second seat is arranged for a sealing ring 15, for example of the 0-ring type.

In the spoke 4a, the cylindrical tang 10 is extended to form the stem of the spoke 4a itself and has at the opposite end a blind threaded hole 18 into which is screwed a terminal portion 19 having an elbowed head which constitutes the member 6 for anchorage to the hub 3.

In the spoke 4b, the cylindrical tang 10 is terminated without any extension and is axially pierced by the blind hole 18. In this case also, a portion 19 is provided which has a greater axial length than in the preceding example, being threaded and having the elbowed head. The elbowed head may be substituted by other mechanisms, which are known per se, for anchorage between spoke and hub.

The complementary element 7 for anchorage on the rim 2 comprises a seat 20 provided integrally on the rim 2 in the form of a substantially tubular appendage 21 and in which the cylindrical tang 10 is received in a sealed manner, guaranteed by the ring 15, with coupling of the cylinder/piston type, and also with the capability of axial displacement in the seat, limited by the two shoulders 12, 13. Normally, the shoulder 12 abuts against the root of the appendage 21 at the base of the channel 22 of the rim 2 itself.

The tubular appendage 21 is obtained by localized deformation and drilling of the rim 2 at the channel 22. The deformation and drilling are preferably effected at the same time by drilling the rim 2 with a fusion tip. This drilling method is known from various documents, for example European Patent Publication No. EP0150518, or from the website of Flowdrill Inc. of St. Louis, Mo. (www.flowdrill.com) and involves a drilling tool coming into contact with the material to be drilled with a relatively high axial pressure and rotation speed. The heat generated renders the material soft and malleable so that it can be displaced by the drilling tool and transported in the feed direction so as to form, in the case in question, a cylindrical tubular appendage 21, tapered externally in a direction away from the rim 2.

Provision is made, however, for the tubular appendage 21 to be obtainable by different techniques, essentially of hot or cold deformation of the rim 2 in the region involved, such as deep-drawing or punching techniques, and the like.

By the above-mentioned coupling, of the cylinder/piston type, between the rim 2 and the corresponding anchorage member 5 of the spoke 4a, 4b, the rim 2 can deform elastically in use without compromising the seal of the rim-to-spoke coupling, thus keeping the inflation chamber of the tire gas-tight, thereby allowing the correct use of tires without an air chamber (so-called “tubeless”). At the same time, the wheel 1 can be produced in a simple manner, with high-speed processing and at low cost.

Although illustrated and described above with reference to certain specific embodiments and examples, the present invention is nevertheless not intended to be limited to the details shown. Rather, various modifications may be made in the details within the scope and range of equivalents of the claims and without departing from the spirit of the invention.

Claims

1. (canceled)

2. (canceled)

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. (canceled)

10. (canceled)

11. A method for the manufacture of a wire wheel comprising, in the following or a different order, the steps of: providing a rim having an integral seat in the form of a substantially tubular appendage of the rim;providing a hub;securing the rim to the hub via a plurality of spokes, each spoke including a stem having a first axial end on which is arranged a first anchorage member capable of being secured to the hub and a second opposed axial end on which is arranged a second anchorage member capable of being secured to the rim; andpositioning the second anchorage member (a) in the seat of the rim with the capability of limited axial displacement in the seat and (b) in a sealed manner with coupling of the cylinder/piston type in the tubular appendage.

12. The method according to claim 11, further comprising providing the substantially tubular appendage by the steps of localized deformation and drilling of the rim at a channel of the rim.

13. The method according to claim 12, wherein the steps of deformation and drilling are effected at the same time by drilling of the rim with a fusion tip.

14. The method according to claim 11, further comprising the step of providing the second anchorage member with an annular shoulder and a snap ring which combine to limit the stroke of the cylinder/piston coupling.

15. The method according to claim 11, further comprising the step of providing the second anchorage member with a cylindrical tang and the wheel with a sealing ring interposed between the tang and the seat of the rim, the sealing ring creating a gas-tight seal enabling the tang to slide axially in a gas-tight manner in the seat of the rim.

16. The method according to claim 15, further comprising the steps of (a) providing the second anchorage member with an annular shoulder and a snap ring which combine to limit the stroke of the cylinder/piston coupling, and (b) positioning the sealing ring between the annular shoulder and the snap ring.

17. The method according to claim 11, further comprising the step of providing the outer surface of the substantially tubular appendage with a taper in a direction away from the rim.

18. The method according to claim 11, wherein the second anchorage member is integral with the stem of each spoke.

19. The method according to claim 11, further comprising: providing the substantially tubular appendage by the steps of localized deformation and drilling of the rim at a channel of the rim;providing the second anchorage member with an annular shoulder and a snap ring, which combine to limit the stroke of the cylinder/piston coupling, and with a cylindrical tang; andpositioning a sealing ring between the annular shoulder and the snap ring, the sealing ring creating a gas-tight seal enabling the tang to slide axially in a gas-tight manner in the seat of the rim.

20. A wire wheel comprising: a rim having an integral seat in the form of a tubular appendage of the rim;a hub; anda plurality of spokes securing the rim to the hub, each spoke including a stem having a first axial end on which is arranged a first anchorage member capable of being secured to the hub and a second opposed axial end on which is arranged a second anchorage member capable of being secured to the rim, and wherein the second anchorage member is received (a) in the seat of the rim with the capability of limited axial displacement in the seat and (b) in a sealed manner with coupling of the cylinder/piston type in the tubular appendage.

21. The wire wheel according to claim 20, wherein the rim has a channel and the tubular appendage is obtained by localized deformation and drilling of the rim at the channel.

22. The wire wheel according to claim 21, wherein the deformation and drilling are effected at the same time by drilling of the rim with a fusion tip.

23. The wire wheel according to claim 20, wherein the second anchorage member has an annular shoulder and a snap ring which combine to limit the stroke of the cylinder/piston coupling.

24. The wire wheel according to claim 20, wherein the second anchorage member has a cylindrical tang and the wheel further comprises a sealing ring interposed between the tang and the seat of the rim, the sealing ring providing a gas-tight seal enabling the tang to slide axially in a gas-tight manner in the seat of the rim.

25. The wire wheel according to claim 24, wherein the second anchorage member has an annular shoulder and a snap ring which combine to limit the stroke of the cylinder/piston coupling, and the sealing ring is positioned between the annular shoulder and the snap ring.

26. The wire wheel according to claim 20, wherein the tubular appendage has an outer surface tapered in a direction away from the rim.

27. The wire wheel according to claim 20, wherein the second anchorage member is integral with the stem of each spoke.

28. A wire wheel comprising: a rim having an integral seat in the form of a tubular appendage of the rim, the tubular appendage having an outer surface tapered in a direction away from the rim;a hub;a sealing ring; anda plurality of spokes securing the rim to the hub, each spoke including a stem having a first axial end on which is arranged a first anchorage member capable of being secured to the hub and a second opposed axial end on which is arranged a second anchorage member integral with the stem and capable of being secured to the rim, and wherein the second anchorage member: (a) is received (i) in the seat of the rim with the capability of limited axial displacement in the seat and (ii) in a sealed manner with coupling of the cylinder/piston type in the tubular appendage, and(b) has an annular shoulder and a snap ring, which combine to limit the stroke of the cylinder/piston coupling, and a cylindrical tang, andwherein the sealing ring is positioned between the annular shoulder and the snap ring, the sealing ring creating a gas-tight seal enabling the tang to slide axially in a gas-tight manner in the seat of the rim.

29. The wire wheel according to claim 28, wherein the rim has a channel and the tubular appendage is obtained by localized deformation and drilling of the rim at the channel.

30. The wire wheel according to claim 29, wherein the deformation and drilling are effected at the same time by drilling of the rim with a fusion tip.