WO2011100954A1

WO2011100954A1 - Weight-optimized tapered-rim wheel for utility vehicles having a novel wheel rim and wheel center weld connection

Info

Publication number: WO2011100954A1
Application number: PCT/DE2011/000137
Authority: WO
Inventors: Bruno Atts
Original assignee: Bruno Atts
Priority date: 2010-02-17
Filing date: 2011-02-14
Publication date: 2011-08-25
Also published as: DE102010008237A1

Abstract

The invention relates to a utility vehicle wheel comprising a tapered rim (1) for tubeless tires and a wheel center which is welded to the side wall (8a) in the curvature of the well base (4) by means of a butt joint. This region is considered to be the most rigid point in tapered-rim wheels, such that wheels having such a rim/center connection are subject to minimum alternating stresses during vehicle operation and thus have higher fatigue strength. Welding is performed only from the inside. The weld seam (11) is characterized in that the rim has weld pool protection (19) that is arranged in a particular manner, resulting in a highly reliable weld connection (11) of rim (1) and wheel center (2). The changed position of the weld seam (11) allows various modifications to the rim, the disc (2) and the valve position (7), such that material savings of more than 15% are achieved, leading to a reduction in wheel weight and costs. The valve system can be chosen such that a straight tube (12) can be used as the outer valve.

Description

Weight-optimized steep shoulder wheel for commercial vehicles with a novel welded connection of rim and wheel disc

description

The invention relates to a commercial vehicle wheel with a steep shoulder rim for tubeless tires and a wheel disc, which is welded in the arc of curvature of the Tiefbettbodens to the side wall by a butt joint. Welding takes place only from the inside.

The connection at this point makes it possible to reduce the use of materials so that the wheel weight and the costs compared to the usually manufactured parts can be significantly reduced.

In the case of vehicle wheels it is known that the edge of the wheel disc can be welded on both sides on the curved transition between the deep bed bottom and the deep bed side wall. Such a connection is described in the utility model DE 000007005756U, where the

Radscheibenrand in the extension of the rim base with an inner and a

External weld (K-seam) is welded. This is intended to ensure that the space for accommodating the brake organs expands and a common centering of the wheel disc and rim is made possible.

For wheels with external valve, the described execution of the double-sided welding is not possible because the space between the rim shoulder and bowl edge are so cramped that a welding torch for a secure weld the outer seam can not be accommodated. In addition, in the presence of an outer seam, the

Housing a valve between the rim and wheel disc no longer be possible.

Currently, steep-shoulder wheels are used as standard wheels for commercial vehicles as described in patent EP 0 701 911 Bl.

The special feature of these wheels is that the valve in the space between the

Rim shoulder and the wheel disc is housed. This was required by the introduction of disc brakes on commercial vehicles. Since the space was very limited in this area, a hump (bead) was introduced as a security element in the rim and the cylindrical seat on which the wheel disc is welded, in the direction Rim center shifts. These changes allowed a curved valve to be located in the protected area between the rim shoulder and the wheel disc. The disadvantage of this construction is that the connecting weld lies in a critically stressed area of the rim. In order to ensure the required operational strength during driving, the rim thickness as well as the wheel disc thickness had to be manufactured in a reinforced version. In addition, the height of the wheel, due to the Humpabmessungen and the required overlap of rim and disc, very high. All these features mean that the weight of such wheels is significantly higher than it was before the introduction of the brake discs and the associated displacement of the valve.

Taking into account the above-described prior art was with the

Invention designed a weight-optimized Steilschulterrad for commercial vehicles with external valve with the aim of reducing feedstock, weight and cost.

This object is achieved by the novel change in the connection of the wheel disc to the rim and the associated possibilities of modifications of the rim and the

Wheel disc solved.

The welding of the wheel disc to the rim is based on the fact that the wheel disc is not welded as usual in the overlap area with the rim by means of a fillet weld, but by butt joint in the curvature between Tiefbettwand and Tiefbettboden. This area has steepest shoulder wheels the largest moment of resistance, so that wheels with a connection at this point while driving are subject to the lowest AC voltages and thus obtain a considerably higher fatigue strength.

In contrast to DE 000007005756U, the welding in the invention is not done on both sides, but only from the inside by a HV shock. In order to perform such a welding safely and not let the molten liquid during the welding on the back (outer edge of the wheel disc), it is required a

To arrange welding pool protection. This is achieved in the form that in the region of the butt joint in the rim a groove with a slightly larger outer diameter than the diameter of the bowl edge by turning, rolling or embossing is introduced. When assembling the parts, a small offset of the bowl to the rim in the direction of the center of the rim. This offset makes it possible that the liquid weld metal can not escape at the outer edge of the bowl during welding and the root burn-in safely

Tiefbettflanke is introduced. The welding of the wheel in the curvature area between Tiefbettwand and

Tiefbettboden allows the following advantageous design options of the wheel, which serve to achieve the goal:

a) The rim shoulder is connected by means of the side wall directly to the low bed, whereby the tire side significantly more space for the accommodation of the valve head is obtained.

b) No hump is required to place the valve in the space between the rim shoulder and the wheel disc.

c) The side wall between the shoulder and the low bed can be opposite to the

Vertical be made steeper, so that a straight valve tube can be arranged.

d) By eliminating the "hump" the connecting wall is moved towards the outside of the rim, whereby the Tiefbettbreite is increased.

e) Since the butt joint eliminates the rim / bowl overlap and the

Sidewall is shifted towards the outside of the rim, resulting in a significantly lower bowl height.

f) Welding the bowl in the region of the largest resistance moment of the rim can reduce the feed thicknesses of the rim and bowl.

In sum, the points mentioned lead to a material saving and weight reduction of the wheel weight by more than 15% and to a reduction of the costs.

The advantage of the straight valve tube is the lower cost of the valve and the cheaper possibilities of automated assembly.

Vehicle wheels, which must have a safety element against slippage of the tire foot when driving with low tire pressure, can of course also be made with this method.

The invention will be described in more detail below with reference to the drawings:

Figure 1 shows a sectional view of an inventive

Vehicle wheel without security element

Figure 2 shows detail "A" before joining the rim and wheel disc Figure 3 shows detail "A" after joining the rim and wheel disc

(HV-seam)

FIG. 4 shows detail "A" after assembly and welding of the rim and wheel disk by means of HV seam. Figure 5 shows detail, A "with an alternative weld pool fuse Figure 6 shows detail, A" with a weld preparation for a butt joint with V-seam.

Figure 7 shows a sectional view of an inventive

Vehicle wheel with safety elements

FIG. 8 shows a wheel according to EP 0701911 B1

FIG. 1 shows the vehicle wheel according to the invention, substantially to scale, with a rim (1) and a wheel disc (2) welded thereto. The rim has a rim well bed (4), an outer and an inner rim shoulder (3a and 3b) inclined relative to the horizontal preferably at an angle of 15 ° +/- 1 °, one between the shoulders (3a and 3b) and the low bed (4) arranged connecting wall (8a and 8b).

On the outer connecting wall (8a) is a valve hole (7) for inserting a valve (12) in the protected area between the rim shoulder (3a) and the wheel disc (2). The angle of the connecting wall (8a) can be chosen so that instead of a curved straight valve tube (12) can be used. For twin wheels, the angle of the valve tube must be located at about 10 ° to the horizontal, so that the usual for the inner wheel valve extension (not shown) protrudes into the opposite vent hole of the outer wheel and from where the tire pressure maintenance is performed.

The wheel disc (2) is in the extension of the deep bed bottom (4) on the arc of curvature (6) to the side wall (8a) by butt joint by means of the inner seam (11) welded. It has at least one opening (10) opposite the valve (12).

Figure 2 shows detail "A" (Fig.l) before joining the rim and wheel disc.

In the subject of the application, the connection is made by a butt joint and a weld of the inner seam. In order to perform such a weld safely and not let the liquid melt on the back (outer edge of the wheel disc (9)), it is necessary to arrange a weld pool.

This is achieved in the subject of the application by inserting a small 1-2 mm deep notch (18) in the arc of curvature (6) by turning, rolling or pressing. The diameter of this notch corresponds to the outer rim diameter (+ 0.2 mm) of the wheel disc (9).

Figure 3 shows detail "A" (Fig.l) after joining the rim and wheel disc. Here you can clearly see that the Radscheibenrand (9) sits in the notch (18) of the rim and when welding the liquid weld metal can not escape on the outside of the bowl edge.

Figure 4 shows detail "A" (Fig.l) after assembly and welding of the rim and wheel disc.

Here you can clearly see that after joining the Radscheibenrandes (9) and the rim (4), a weld (11) can be performed very safely. The Wurzeleinbrand (13) is formed in the Tiefbettkrümmung (6), the bowl edge (9) and the rim are fully covered by the weld. The liquid weld metal can not escape to the outside during welding.

Fig. 5 shows detail "A" for an alternative weld pool

As an alternative, a 2 mm wide chamfer (17) attached to the edge of the bowl (9) can serve as a weld pool fuse, which has an angle (15) which corresponds to the angle of the tangent (16) of the depression curvature at the point of contact. Due to the tangential application of the

Bowl edge (9) for Kr immungsbogen (6) also creates a displacement of the bowl edge to the rim, so that when welding the Wurzeleinbrand (13) in the Tiefbettkrümmung (6) and the liquid weld metal can not escape at the outer edge of the bowl (9).

6 shows detail "A" with a weld seam preparation for a butt joint by means of V-seam (21), which is also possible as an alternative to the HV seam In this case, the bowl edge is provided with a chamfer (22) and an angle corresponding to the requirement (FIG. 21).

Fig. 7 shows a sectional view of a vehicle wheel according to the invention with security elements.

A 8 to 10 mm wide Ledge (5 a and 5b), the diameter of the cylindrical surface corresponds exactly to the standardized smallest diameter of the shoulder (3a and 3b), prevents the

Slipping of the tire foot when driving with too low tire pressure.

Of course, rims with Hump can be connected to the wheel disc with this method.

Fig. 8 shows a wheel according to EP 0701911 Bl

This design is considered as prior art for a current standard Teilschulterrad with external valve and is suitable to illustrate the innovations of the subject of registration (Fig.l). - In order to carry out welding of the wheel disc according to the invention in the extension of the deep bed bottom (4 / Fig.l) of the rim, the cylindrical transition part (22 / Figure 8) between the shoulder and the deep bed wall is omitted, ie the rim shoulder (3a Figl) is directly with the Tiefbettboden (4) by means of the wall (8a /Fig.l) connected. As a result, the space conditions on the tire side are improved so that sufficient space is created for the valve head (20) and no "hump" (FIG. 20 / FIG. 20) for accommodating the valve (12) in the space between the rim shoulder (3 a) and the wheel disc (2). 8) is required more.

The side wall (8a) can be made steeper relative to the vertical than in Fig. 8, so that a straight valve tube (12) can be arranged.

By eliminating the "hump" (20 / Fig.8), the connecting wall (8a) is moved towards the outside of the rim, whereby the deep bed width is increased.

Since the rim / bowl overlap (Figure 8) is omitted by the butt joint and the side wall (8a) is displaced towards the outside of the rim, a considerably lower results

Bowl height (2 / Figl).

By welding the bowl in the region of the largest moment of resistance of the rim, the feed thicknesses of the rim and the bowl can be reduced.

The thickness of the insert of the rim can be better because of the cheaper

Stress conditions, which are given by the new position of the weld, can be reduced.

Estimated weight advantage of the rim 10%.

Due to the modification of the rim and the new position of the weld, the

Wheel height reduced by 30-40 mm. The feed thickness for the bowl can be reduced by approx. 0.2-0.3 mm.

Estimated weight reduction of the wheel disc 20%.

Claims

claims

A commercial vehicle wheel made of sheet steel with a steep shoulder rim (1) which has an outer shoulder (3a), a connecting wall (8a), a deep bed bottom (4), a connecting wall (8b) and an inner shoulder (3b), wherein in the connecting wall (8a ) a hole (7) for accommodating the valve (12) is introduced, and a wheel disc (2) having a bowl forming the side wall (14) with at least one ventilation opening (10) arranged in the radial direction relative to the valve hole (7) is, characterized in that the connection of the rim (1) with the bowl (2) in the curvature region (6) between the low bed wall (8 a) and the extension of the deep bed floor (4) by a butt joint, wherein the weld (11) only is executed from the inside of the wheel;

The execution of the weld is characterized in that the rim in

Curvature arc (6) has a notch (18) is inserted in the bowl rim (9), resulting in an axial displacement of the bowl (2) to the rim (1) in the direction of the rim center and thus produces the function of the weld pool (19);

The rim is characterized in that by the direct connection of the shoulder (3a) with the low bed (4) by means of the connecting wall (8a) on the tire side the required space for housing the valve head (20) is formed and the valve hole (7) is arranged in that a straight valve tube (12) sits in the space between the rim shoulder (3a) and the bowl side wall (14) without protruding into the inside of the bowl (2).

2. Vehicle wheel according to claim 1, characterized in that on the outer edge (9) of the wheel disc a chamfer (17) with an angle (15) is attached, which the angle of the tangent (16) of the arc of curvature (6) at the contact point of the rim and the wheel disc corresponds to where the chamfer (17) takes over the function of the weld pool.

3. Vehicle wheel according to claim 1, characterized in that the joint welding of the butt joint is effected by means of a HV seam (11)

4. Vehicle wheel according to claim 1, characterized in that the joint welding of the butt joint is effected by means of a V-seam (21)

5. Vehicle wheel according to claim 1, characterized in that the angle of

Connecting wall (8a) relative to the vertical can be chosen so that a curved valve can be arranged.