DE2533440A1 - DISC WHEEL OR DETACHABLE RIM ARRANGEMENT - Google Patents

Description

MEISSNER ε. F.OLTE

BREMEN

PATENTANWÄLTE DIPL.-ING. HANS MEISSNER DIPL-ING. ERICH BOLTE

Applicant;

GKN Sankey Limited

Albert Street Works, ^{D 2S} * ^! £ f _r l ₂ ? ⁴ * ⁷ * ¹⁹⁷⁵

Federal Republic of Germany Telephone 0421-342019 Staffordshire, Telegrams: PATMEIS BREMEN

England

Our sign

1329

Disc wheel or removable rim assembly

The invention relates to wheels for vehicles.

The invention is particularly concerned with disc wheels and removable rim assemblies that have an asymmetrical Rim with a first and a second axially spaced apart bead support surface, which is formed by a drop center and a shoulder is separated between the first bead support surface and the drop center, and a washer or shoulder strap, which are welded to the rim.

If the rim has a disc welded to it, the rim and the disc form a disc wheel, which

509887/0808

Models sent in will be destroyed after 2 months, if not frozen. Oral agreements, especially by telephone, require a written one Confirmation. - The costs invoiced are due without deduction on the invoice date. - In the event of late payment, bank interest will be charged

Jurisdiction and place of performance Bremen. Bremer Bank, Bremen, No. 231002a · 0Ie Sparkasse in Bremen, No. 1045355 ■ AlIg. Deutsche Credil-Anstait, Bremen, No. 202 598 · Postal checking account: Hamburg 33952-202

hereinafter referred to as "the specific type" disc wheel will. When the rim has a shoulder tape welded to it, a removable rim assembly is created, which is hereinafter referred to as the rim arrangement "of the specific type", the rim arrangement being detachable a hub can be attached. Disc wheels and detachable rim assemblies of the particular type are widely used used with tubeless tires.

If a rim of a disc wheel or assembly of the particular type carries an inflated tire, is subject to the rim forces which create an overall axial tension load in the rim, i.e. parallel to the axis of rotation of the wheel or the arrangement, and additional differential loads in the radially inner and outer surfaces of the rim, which caused by the bending of the rim section.

It has been found that the total loads in the rim portion due to an inflated tire in the portion of the rim portion which the first bead seating surface and the shoulder contains, are smaller than in the part of the rim portion which contains the second bead bearing surface. as As a result of these investigations, it has been found that there is an optimal point at which the disc or the attachment tape welded to a rim in a disc wheel or removable rim assembly of the particular type is to ensure low loads and an absence of steep load gradients in the rim near the welds to achieve.

According to the invention, therefore, a disk wheel or an ab-

9887/0808

Acceptable rim assembly of the particular type provided in which the disc or the lug band with the radially inner Surface of the rim near the transition from the first bead bearing surface to the shoulder T-butt welded is,-

The selection of this point for welding the two parts of the wheel or assembly has a number of advantages. First is the total exposure level in the areas around the weld compared to the exposure levels in other parts of the rim small. Second, the stress gradients are near the transition from the first bead support surface to the shoulder less steep than in other parts of the rim portion, so that some leeway in terms of on the fastening point of the rim with the disc or the tape in which the load levels are present change only insignificantly. Thus, within certain limits, disks and attachment strips with different diameters can be used the same rim can be used to thereby create wheels or assemblies with different curvatures as desired create.

Third, because of the T-shape of the weld joint, the welds are for an automatic welder easily accessible which is a significant advantage in the mass production of wheels and detachable rim assemblies. In addition, this allows the weld to be kept away from the deep bed, which is desirable and what. can also be achieved with narrow wheels.

Finally, especially for disk wheels, the disk can contain a substantial rounding, so that it is stable is. Some earlier designs require-

509887/0808

25334AÜ

been borrowed. Use discs that are relatively flat rounded and therefore do not have the same strength as a substantially rounded disc.

Preferably, the center line of the edge portion of the tape or disk in radial section with a plane that defines perpendicular to the axis of rotation of the wheel or assembly and through the intersection of the center line and the inner surface, with which the edge part is welded, runs an angle between 0 and 30 °, the edge part of the weld joint extends in one direction so that it is partially within the first bead seating surface lies.

It has been found in accordance with the invention that the optimal location for the disc or tape is relative to the rim is where the axially inner edge of the disc or band, i.e. the edge of the disc or band is in proximity of the low bed, at the transition between the shoulder and the first bead support surface is. The edge of the disc or of the tape is therefore under the first bead support surface and can be easily machined to the appropriate shape. As mentioned above, there is one near the transition small area of low stress and it has been found according to the invention that the axially inner edge of the disc or of the tape within a distance B / 5 from the transition. can be arranged, where B is defined below is.

There are several standards to which disc wheels and removable rim assemblies of the particular type are manufactured will. Three institutions that publish standards are the Tire and Rim Association, Inc., the European Tire and Rim Technological Organization "and the" British Standards

509887/0808

253344Ü

Institution ". Every wheel or arrangement becomes international according to one of these standards or any other acceptable standard and each standard determines a smallest bead contact surface width, i.e. a dimension length parallel to the axis of rotation of the wheel or the arrangement from the outer edge of the bead bearing surface to, for the first bead bearing surface, the transition on the radially outer surface of the rim between the bead contact surface and the shoulder and, for the second bead support surface, the transition on the radially outer surface of the rim between the bead support surface and the wall of the drop center.

Dimension B is the minimum bead seating surface width for the first bead seating surface, i.e. the bead seating surface near the shoulder, the standardization according to which the wheel or the detachable rim assembly is made. Wheels with different nominal dimensions can have different B dimensions, but the appropriate dimension for the purposes of the present invention is the dimension of the bead pad width for the wheel or the detachable Rim arrangement according to the standard according to which the wheel is manufactured and as specified in the standard for the particular Wheel size is specified.

In the following, exemplary embodiments of the invention are described in detail with reference to the figures.

It shows:

Fig.1 a reproduction of the system of standards of the manual of "Tire and Rim Association, Inc." for 15 ° drop center rims, with certain dimensions for the sake of clarity have been left out,

509887/0808

2 shows a half section through a disk wheel of the specific Type according to the invention,

3 shows a view of a complete wheel of the embodiment according to FIG. 2 _f

4 shows a detailed view on an enlarged scale of the welded joint between the disc and the rim and

FIG. 5 shows a section similar to FIG. 2 of a removable rim arrangement of the particular kind according to the invention.

As shown in Figure 1, the rim contour has a drop center 10, a first bead support surface 11, a cylindrical shoulder 12 and a second bead support surface 13. There is a minimum dimension D for the width of the first bead support surface 11. The minimum width for each nominal rim dimension is in Column D in Figure 1 is given in inches. For example, the minimum dimension D for a wheel with a nominal rim dimension of 22.5 "χ 7.50" equal to 1.60 ".

As will be described further below, a wheel that would be produced in accordance with the standard system shown in FIG the dimension B mentioned in the previous description is equal to the minimum dimension D in Fig.1 be. Other standard systems use different letters to represent the minimum bead contact surface width, but in any case the dimension B will be equal to the dimension equivalent to the dimension D in FIG.

In Fig. 2 is a disc wheel with a size 22.5 "χ 7.50" shown, which satisfies the standard dimensions shown in Fig. 1, so that the minimum bead contact surface width of the

509387/0808

most bead contact surface, i.e. the dimension B equals 1.60 " so that B / 5 is 0.32 ".

In Fig.2 is a disc wheel with a rim 14 and a Disk 15 shown. The rim section has a first bead support surface 16, the surface of which faces the axis of rotation of the wheel is inclined by 15 °. At the outer edge of the first bead support surface 16 is a tire retaining flange 17 formed by bending the rim material. Inward of the bead support surface 16 is a cylindrical shoulder 18 trained. In addition, a second bead support surface 19 is provided, on the outer edge of which a further tire retaining flange 20 is formed. Between the bead support surfaces 16 and 19, a deep bed 21 is arranged, the one Has bottom 22 and side walls 23 and 24.

The rim is made of strip material of constant thickness and the tire retaining flanges 17 and 20 are of a sufficient size Provide curvature to achieve the required strength. The larger that of the flanges 17 and 20 As is known, the greater the strength and the more stable the rim portion is. Between the first bead support surface 16 and the shoulder 18 is a transition 25. Between the shoulder 18 and the deep bed wall 23 has a rounded transition 26 and another rounded transition 27 is located between the bead support surface 19 and the drop center wall 24.

The disc 15 is with the inner surface of the rim in the vicinity of the transition 25 between the first bead bearing surface 16 and the shoulder 18 welded.

The disc 15 has a flat central part 28, which in the

509887/0808

25334AÜ

Center is open to let through the hub on which the wheel is to be mounted, and a number of spaced apart Holes 29 for receiving the wheel bolts. The disc has an outer frustoconical portion 30 which merges into the flat part 28 via an area 31. The cone angle increases in the vicinity of the outer edge 32 of the disc of the disc so that a center line 33 of the edge portion 34 of the disc with a plane 35 which is perpendicular to the axis of rotation 36 of the wheel runs, forms an angle A, which in the present case is approximately equal to 15 °. The angle A lies within the range of 0 to 30 ° and the frustoconical Part 30 lies within the first bead support surface 16, i.e., in other words, the disc extends from its welded connection to the rim in a direction which is generally points more away from the drop center than towards the drop center.

As shown in Figure 4, the center line 33 preferably runs perpendicular to the inner rim surface 37 to which the edge part of the disc is welded. As shown are the disc and the rim by two welds, an axially outer weld 38 and an axially inner weld 39 connected to each other. If desired, one of these welds can be omitted.

The axially inner edge 40 of the disk lies at the transition 25 between the bead seating surface 16 and the shoulder 18, i. near level 35 and this is the optimal spot. The welded connection can, however, be somewhat different from the optimal one position shown. The inner edge 40 can be moved to the right or left in Figure 2 until it lies on one of the lines 41 and 42, each at a distance B / 5, measured parallel to the axis of rotation 36, from the inner Edge of the first bead support surface 16, i.e. the line 43 lies.

509887/0808

Distance B is measured between lines 43 and 44. The disk is preferably moved to the left from its optimal location if this is not available, see above that the outer edge of the disc is below the bead support surface but the exact position of the disc is determined by the physical constraints imposed by the Situation in which the bike is to be used.

The fastening of the disk to the rim in the manner described in the vicinity of the transition 25 has a row of advantages. First, the total loads in the rim in the fastening area are smaller than in other parts the rim if the rim carries an inflated tire.

Second, as can be seen from the figures, the two welds 38 and 39 are for an automatic welding device easily accessible.

Third, by moving the, attachment point of the Disk within the area determined by the requirement that the inner edge of the disk between the Lines 41 and 42 lies, different turns are obtained, the turn being taken by the line 46 between the median plane 47 of the wheel and the outer end face 48 of the central part 28 of the disc is displayed. It is noted that some modification of the overall diameter of the disc is required for different bends, but that. this modification is quite small and that standard disks can therefore be used and that the amount of machining on the edge of each particular disc arranged for the required turn. It is not required, different shaped discs for different

5098S7 / 0808

provide for different turns. It is only necessary to change the diameter of the disc.

Fourth, the disc has a considerable plate shape, i.e. there is a considerable distance between the plane 35 and the face 48 so that a stable disc is obtained will.

The wheel shown in Figures 2, 3 and 4 is intended to be used with a tubeless tire and in Figure 2 is a valve hole 49 shown, there are five around the outer part of the disk Access holes 50 provided. The holes are placed as close as practical to the outer periphery of the disc to create a drain for water and dirt and to prevent the accumulation of water and dirt inside the wheel,

With the present invention, a disk wheel is of particular use Kind created with a very advantageous structure. The invention is also applicable to removable rim assemblies, as shown in Fig.5, applicable, in which the disc 28 is replaced by an attachment tape 51 which has a similar Has the frustoconical shape like the part 30, but which can be detachably connected to a hub. The neck tape is welded to the rim with the same advantages as has been described in connection with the disc. the in Fig.5 parts shown, which with those in Fig.2 and 3 are identical, have the same reference numerals with a prefix 1.

509837/0008

Claims (1)

Claims Disc wheel or removable rim assembly comprising an asymmetrical rim with a first and a second axially spaced bead support surface, by a low bed and a shoulder between the first bead support surface and the drop center are separated, and with a washer or an attachment tape that are welded to the rim, characterized in that the disc (15) or the attachment band (51) with the radially inner surface (37, 137) of the rim (14, 114) in the vicinity of the transition (25, 125) from the first bead bearing surface (16, 116) T-butt welded to the shoulder (18, 118) is. 2. wheel or arrangement according to claim 1, characterized in that that the center line (33, 133) of the edge part (34, 134) of the band (51) or the disc (15) in radial section with a plane (35, 135) perpendicular to the axis of rotation (36) of the wheel or assembly and through the intersection of the center line (33, 133) and the inner surface (37, 137) with which the edge portion (34, 134) is welded, runs, forms an angle (A) between 0 and 30 ° and that the edge part (34, 134) of the weld joint extends in one direction so that it is partially within the first bead seating surface (16, 116) lies. 3. wheel or arrangement according to claim 2, characterized in that the center line (33, 133) perpendicular to the inner Surface (37, 137) runs. 509887/0808 - ₁₂ - 25334AÜ 4. Wheel or arrangement according to one of the preceding claims, characterized in that the axially inner edge (40, 140) of the disc (15) or the band (51), ie the edge (40, 140) of the disc (15) or of the belt (51) in the vicinity of the deep bed (21, 121), at the transition (25, 125) between the shoulder (18, 118) and the first bead support surface (16, 116). 5. wheel or arrangement according to one of claims 1 to 3, characterized in that the axially inner edge (40, 140) of the disc (15) or the band (51), ie the edge (40, 140) of the disc (15 ) or the band (51) in the vicinity of the deep bed (21, 121), within a distance B / 5 (as defined in the description) from the transition (25, 125) between the shoulder (18, 118) and the first bead support surface (16, 116) lies. For the applicant: Patent attorneys Meissner & Bolte Bremen, Sievogtstrasse 21 July 24 , 1975 Applicant: GKN Sankey Limited
Albert Street Works,
BiIston,
Staffordshire,
England 509887/0808