Land vehicles – Wheeled – Running gear
Patent
1989-03-08
1990-10-30
Marmor, Charles A.
Land vehicles
Wheeled
Running gear
280717, 267276, 267281, B60G 300
Patent
active
049663860
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a torsion spring bar axle for vehicle-trailers, especially for recreation vehicles and the like. Herein, each wheel swing lever is mounted to a hollow torsion rod, which is supported in the peripheral direction in a hollow and prismatic carrier tube by means of strand-shaped rubber bodies. The hollow and prismatic carrier tube is fixedly connected to the trailer frame and the hollow torsion rod protrudes without contact by a steel torsion rod, which is connected nonrotatably to the wheel swing lever on one side and to the carrier tube on the other side.
BACKGROUND OF THE INVENTION
Such a torsion spring bar axle is known through French Pat. No. 2 123 291. There the torsion rod and the carrier tube have a square cross-section, the side of the strand-shaped rubber bodies facing inside being adjacent to the plane outer wall of the torsion rod and the side facing outside being adjacent to the bevelled inner edge of the carrier tube. It is known from practice that such torsion spring axles do not have substantial dampening characteristics, as the rubber bodies are merely subject to compression or squeezing deformation.
The steel torsion rod protruding through the hollow torsion rod connects the wheel swing levers to one another and is supported rotationally rigid in the central section by a wall interspersing the carrier tube.
In cooperation the rubber bodies and the steel torsion rod of the rubber spring axle result in a lightly steeper spring characteristic with higher load resistance, but it acts practically without dampening.
SUMMARY OF THE INVENTION 4
The invention is based on the task of developing a torsion spring bar axle improved with regard to the prior art, which requires a much smaller spring range of the wheel swing lever, which has good dampening characteristics and which can be mounted and adjusted easily.
The solution of this task according to the invention is that the rubber bodies are led between concave indentations of the torsion rod and fitting angle areas of the carrier tube facing the indentations and that a steel torsion rod is axially secured in the hub of the assigned wheel swing lever and that it is also mounted rotationally rigid in a hub, which engages by means of a toothed flange with a likewise toothed flange being an integral part of the carrier tube. The two flanges can be screwed together in a twisted position with regard to one another.
In such an arrangement according to the invention the deflection of the single wheel swing lever is branched. One branch works by means of the rubber bodies on the rigid axle tube and leads to the dampening of the spring action. The other branch works by means of the built-in steel torsion rod on the rigid axle tube, too, but without any dampening action. The result is a high deflection output with a dampening effect at a small spring action. Therefore the spring suspension in highly loaded vehicle trailers can be dampened.
French Pat. No. 2 442 728 does disclose a rubber spring axle with a hexagonal carrier tube and a triangular torsion rod, whose walls are indented concavely. However, the steel rod is not used as a steel torsion rod, but as a stabilization element for both the wheel swing levers. The known rubber spring axle features a soft spring action of the wheel swing lever during the whole load range and dampening in the spring action.
The cross section of the strand-shaped rubber bodies and the rigidity of the rubber material can influence the spring characteristics of the known torsion spring axles to some extent. This possibility is no longer given, however, when the design of the vehicles does not allow for an arbitrarily sized design of the rubber spring axle, and especially if the spring range of the wheel swing lever is limited.
Within the framework of one embodiment according to the invention the steel torsion rod is built with a pre-tension of, e.g. 5.degree. and comprises several layers of spring steel bands with a rectangular cross section, which together form a preferably
REFERENCES:
patent: 2409501 (1946-10-01), Krotz
patent: 2577761 (1951-12-01), Hickman
patent: 2606020 (1952-08-01), Anderson
patent: 2702701 (1955-02-01), Thorne et al.
patent: 3687479 (1972-08-01), Kober
patent: 4723790 (1988-02-01), Wharton
Alois Kober KG
Finlay Tamara L.
Marmor Charles A.
LandOfFree
Torsion spring bar axle for vehicle trailers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Torsion spring bar axle for vehicle trailers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torsion spring bar axle for vehicle trailers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-271546