Railway rolling stock – Trucks – Axle bearing mounting
Patent
1983-02-17
1985-07-09
Song, Robert R.
Railway rolling stock
Trucks
Axle bearing mounting
105224R, 1052241, B61F 530
Patent
active
045274878
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for providing vertical suspension of the chassis or frame of a bogie and the longitudinal and transverse coupling of each box of said chassis in a railway driving or carrying bogie.
BACKGROUND OF THE INVENTION
In a bogie suspension, flexibility in the vertical direction between the bogie chassis and each axle box must be provided. It is also necessary for each axle box to be guided with respect to the chassis, longitudinally and transversely.
Various types of bogie are known in which elastic studs are mounted between the bogie frame and each axle box.
In certain bogies, the suspension and coupling between the frame and each axle box are formed solely by means of studs of elastomer framing this axle box. Each elastic stud is housed between two parallel support surfaces slightly inclined with respect to the vertical. The studs are positioned in pairs in dihedra whose bisector planes are vertical, this arrangement enabling a vertical load of combined compressive and shearing stresses to be supported. The rigidity in the vertical direction is not negligable.
In other bogies, helicoidal springs for ensuring the vertical suspension are associated with studs of elastomer providing the flexible couplings. In certain bogies each elastomer stud is housed between two parallel support surfaces slightly inclined with respect to the vertical. These flexible studs are positioned in pairs in dihedra of which the bisector planes are vertical so that the vertical loads are supported with combined compressive and shearing stresses. The elastomer studs are mounted in parallel with the vertical suspension springs. This arrangement disturbs operation particularly with high frequency stresses.
In other bogies the suspension and coupling between the chassis and the axle box are formed by a helicoidal spring and elastic studs which frame the axle box. Each elastic stud is housed between two vertical support surfaces and the elastomer material is prestressed by squeezing. Under the effect of creep the prestressing diminishes in time.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a device ensuring the vertical suspension of a bogie chassis and the longitudinal and transverse coupling of each axle box and capable of procuring, without disturbing the vertical suspension, a certain radial and axial flexibility of the axle. This devices uses studs--of elastomeric material--which are prestressed, so that the prestressing does not develop either in time nor in the course of oscillations of the suspension. Through this fact, the steering characteristics are constant and independent of the creep of the material and the vertical dynamics of the suspension are not modified. These dynamics are however modifiable by construction and by the choice of the characteristics of the elastomers used.
The device according to the invention comprises two vertical suspension springs through which the bogie frame is supported on the axle box, creating a rotary torque on this box, and includes two flexible couplings mounted spaced in altitude between the frame and the axle box so as to be compressed when the axle box rotates under the action of the rotary torque. It is essentially characterized by the fact that the rotary torque is given by two suspension springs of helicoidal spring type which are mounted on each side of the vertical plane passing through the axle box, and by the fact that each flexible coupling is constituted by at least one elastic stud forming a monoblock part whose terminal cross-sections are fixed to a support surface of the bogie frame and to a support surface of the axle box, so that the effect of compression due to the suspension springs results in a shearing rigidity weak in the vertical direction.
According to a feature of the invention, the stiffnesses of the two springs and the respective distances of these springs with respect to the vertical plane passing through the axis of the axle are determined so that the torque acting o
REFERENCES:
patent: 2836130 (1958-05-01), Rossel
patent: 3841233 (1974-10-01), Sinclair
patent: 4109586 (1978-08-01), Briggs et al.
Creusot-Loire
Song Robert R.
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