Land vehicles – Wheeled – Running gear
Reexamination Certificate
1999-10-14
2001-11-27
Mai, Lanna (Department: 3619)
Land vehicles
Wheeled
Running gear
C280S005500, C280S006157, C280S124160, C280S124116, C280S086500, C280S763100, C280S764100, C180S209000
Reexamination Certificate
active
06322090
ABSTRACT:
BACKGROUND OF THE INVENTION
The subject of the present invention is a suspension system with an oscillating, rigid axle, particularly for tractors.
The current tendency to build fast agricultural tractors makes it necessary to provide suspension systems, particularly for the front axles, which ensure the stability of the vehicle together with adequate comfort even when travelling at the relatively fast speeds which are developed nowadays.
There are currently many suspension systems available on the market. A typical example, in the field of which the present invention also lies, is that of systems with oscillating, rigid axles supported by the load-bearing structure of the tractor by means of a sub-frame.
The sub-frame normally defines an articulation point about which the axle can move along a substantially vertical path.
A disadvantage encountered with these devices lies in the fact that they require specific provisions of the load-bearing structure—the so-called “carriage” of the tractor—and are unsuitable for fitting on vehicles which do not have such provision, that is, which are arranged for receiving either conventional oscillating axles or axles provided with suspension.
Another disadvantage lies in the fact that current structural configurations of the sub-frame, particularly with regard to the positioning of the articulation point, define a path of the axle which is not rectilinear but is generally arcuate about the articulation point. This leads to variations in the wheel base or spacing between the axles of the tractor and/or to movements of the axle transverse its vertical axis, which may adversely affect the correct behaviour of the vehicle in motion.
SUMMARY OF THE INVENTION
The main aim of the present invention is to provide a suspension system which is devised particularly but not exclusively for agricultural tractors and which is designed structurally and functionally so as to prevent all of the disadvantages complained of with reference to the prior art mentioned.
A further object of the invention is to provide a suspension system which can be fitted on tractors without requiring substantial structural modification thereof.
Another object of the invention is to render the suspension system optionally adaptable to agricultural tractors to replace conventional oscillating rigid axles.
This aim and these objects are achieved by the invention by means of a suspension system including the characteristics illustrated in the following claims.
REFERENCES:
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patent: 3809429 (1974-05-01), Channell
patent: 3952826 (1976-04-01), Barker et al.
patent: 4092012 (1978-05-01), Ishigami
patent: 4168861 (1979-09-01), Carroll
patent: 5074580 (1991-12-01), Wagner et al.
patent: 5784740 (1998-07-01), DiSieno et al.
patent: 5931486 (1999-08-01), Andreis
patent: 6012706 (2000-01-01), Gill
patent: 6098551 (2000-08-01), Kern
Chignoli Carlo
Pirotta Santino
Scirea Paolo
Carraro S.p.A.
Mai Lanna
Royal, Jr. Paul
Sughrue Mion Zinn Macpeak & Seas, PLLC
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