Spindle for a vehicle wheel, provided with at least one ball joint
This invention relates to a steering spindle for a vehicle wheel, provided with at least one ball joint. 
     In conventional wheel suspension constructions, the vehicle wheel is suspended and mouned at a steering king pin, which in its turn is articulated with the dumb irons of the vehicle. Also, the steering connecting rod is in articulated connection with the steering spindle. The steering king pin in these constructions is forged or cast and, consequently, heavy and expensive. The steering spindle, as already mentioned, is articulated at a joint with the dumb irons, which joint is realized by means of ball joints, the ball part of which is supported in a cup-shaped member, usually in the dumb iron. The fastening part of the ball joint usually is either a cylindrical pin fitted into a bore in the steering spindle and locked therein by special means, or it is of cone shape and inserted into a corresponding conical bore in the steering spindle or dumb iron. The fastening of this kind of ball joint is effected by means of a thread and nut. 
    
    
     According to the present invention, a steering spindle is proposed which is easier and cheaper to manufacture and easy to mount, but yet meets the specified requirements. The invention is described in greater detail in the following, with reference to the accompanying drawings, in which 
     FIG. 1 shows a partial cross-section through a wheel suspension with a steering spindle according to the invention, 
     FIG. 2 shows a cross-section through a fastening device for a ball joint for the suspension of FIG. 1, 
     FIG. 3 is a side view of the fastening device shown in FIG. 2, 
     FIG. 4 is a side view of a modified fastening device for a ball joint, 
     FIG. 5 shows a section through a ball joint member with fork-shaped fastening device, 
     FIG. 6 shows a section through a part of a modified fastening device according to the invention. 
    
    
     Referring to FIG. 1, 1 designates the rim of a vehicle wheel, 2 designates the bearing assembly of the wheel, and 3 the steering spindle of the wheel, the spindle being made of pressed sheet metal. The steering spindle is fixed to the flanged outer ring of the bearing assembly. The ball joint member of the steering spindle is designated by 5, and the dumb iron of the vehicle is designated by 6. In the embodiment shown, the fastening part of the ball joint member 5 is designated as a plate-shaped member 7 attached to the steering spindle 3 by means of screws 8 and nuts 9. The fastening may also be obtained by riveting or welding. The aforedescribed ball joint arrangement is shown on a larger scale in the FIGS. 2 and 3 where the ball of the member is designated by 10. 3&#39; designates a bentover reinforcing edge on the steering spindle 3, which is manufactured, for example, of sheet metal. In FIG. 4 a modified ball joint member is shown comprising the ball 11 and the plate-shaped fastening part 12, which part is formed with two wings 13 extending from the centre line of the member to each direction. FIG. 5 shows a ball joint member with a fork-shaped portion. 
     In FIG. 6 an inverse variation of a fastening device is illustrated. The edge of the steering spindle 3 includes a bore 18. The outer casing of the ball joint member is divided into two shell, 19 and 20, which are provided with flanges, 21 and 22, by means of which the ball joint member 5 is fastened on the steering spindle 3. In this aforedescribed embodiment the fastening is effected in a manner opposite to that previously described, i.e. the fastening part of the member 5 is attached to the dumb iron 6, and the ball part of the member rests in the socket means formed by the shells 19, 20 mounted in the bore 18 of the steering spindle 3. In this arrangement the shell may be pressed into the bore 18, with the sheet metal of the spindle 3 being upset to hold the shell. 
     The invention is not restricted to the embodiments described above, but can be varied in several ways within the scope of the following claims.