Endless belt power transmission systems or components – Resilient connection between pulley or guide-roll rim and mount
Patent
1996-12-11
1997-12-30
Schoeppel, Roger J.
Endless belt power transmission systems or components
Resilient connection between pulley or guide-roll rim and mount
474135, F16D 312
Patent
active
057023140
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a tensioner for traction drives comprising a base element and a pivoting element in the from of a tension roller support arranged partly concentric with each other, and further comprising a torsion spring guided on a bush for bracing the base element and the tension roller support against each other, said torsion spring causing a displacement of the tension roller support into an end position in which a tension roller tightens the tension drive, the tension roller support being connected to a friction element for damping adjusting movements.
In a tensioner of the above type known from DEC 32 25 411, a tension roller support is mounted with the help of a bush on an axle of the base element. The bush is surrounded by a torsion spring which is clamped between the base element and the tension roller support. The end of the spring bearing against the base element is supported on an annular flange of a bush-like bearing element which is guided on the bush of the tension roller support. The bearing element has a radially stepped peripheral surface and a longitudinal dimension corresponding to a part of the spring length. The bearing element is configured such that at least the end region of the torsion spring at the end oriented towards the annular flange bears directly against the peripheral surface of the bearing element.
Disadvantageously, due to the partial contact of the spring with the bearing element in this prior art, the radial movement of the spring coils on a pivoting of the tension roller support is limited to only a few coils. During high-frequency adjusting movements of the tension roller support, this structure can give rise to sympathetic vibrations which can result in the destruction of the spring accompanied by a failure of the tensioner.
SUMMARY OF THE INVENTION
It is an object of the invention to create an improved tensioner of the above type which possesses higher safety against failure of the torsion spring and assures a damping of noises in the tensioner by cost-effective measures.
The invention achieves this object by providing a base element; a pivoting element in the form of a tension roller support arranged partially concentric with each other; a torsion spring guided on a bush for bracing the base element and the tension roller support against each other, with th torsion spring causing a displacement of the tension roller support into an end position in which a tension roller tightens the tension drive, and with the tension roller support being connected to a friction element for damping adjusting movements; and a tension bush positioned between the bush and the torsion spring so as to bear against an inner periphery of the torsion spring, with the torsion spring having a length which corresponds to the length of the torsion spring and including a longitudinal slot.
According to the invention, a tension bush having a longitudinal slot is disposed in the annular space between the torsion spring and the bush. The tension bush which, in the installed state, extends over almost the entire length of the torsion spring, is configured so as to bear against the inner periphery of the torsion spring. Due to the longitudinal slot, the tension bush is pre-tensioned and deformable and can therefore adapt itself to changes in the inner diameter of the torsion spring which come about on a displacement of the tension roller support of the tensioner. By reason of a permanent abutment of all the spring coils against the tension bush, detrimental spring vibrations are advantageously prevented by the tension bush. At the same time, disadvantageous noise generation due to spring vibrations is obviated and an effective protection is achieved against sympathetic vibrations which can lead to a breaking of the spring. The tension bush of the invention constitutes an economic means which can be mounted by a simple insertion of the tension bush into the torsion spring and improves the operational life of the torsion spring and consequently, the operatabilit
REFERENCES:
patent: 4886484 (1989-12-01), Hanes
patent: 4889520 (1989-12-01), Brandenstein et al.
patent: 5236396 (1993-08-01), Golovatai-Schmidt et al.
Feiereisen Henry M.
INA Walzlager Schaeffler KG
Schoeppel Roger J.
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