Belt tensioning device

A belt tensioning device for a belt drive having at least two belt pulleys and a continuous belt, the device comprising:

• a torsion spring assembly with a longitudinal axis (A2) and at least one torsion bar or torsion tube, the torsion spring assembly being adapted to be supported axially and radially in a rack;
• first and second tensioning arms which, at their respective one ends, are arranged at the torsion spring assembly so as to be aligned approximately radially relative to the longitudinal axis (A2);
• and
• first and second tensioning rollers rotatably arranged at the respective other ends of the first and second tensioning arms, wherein axes of rotation (A1, A3) of the first and second tensioning rollers extend substantially parallel to the longitudinal axis (A2) of the torsion spring assembly and wherein the first and second tensioning arms are resiliently supported relative to the rack or relative to one another so as to oscillate around the longitudinal axis (A2).

A belt tensioning device for a belt drive having at least two belt pulleys and a continuous belt, the device comprising:

• a torsion spring assembly with a longitudinal axis (A2) and at least one torsion bar, the torsion spring assembly being adapted to be clamped axially and in a rotationally fast way into a rack;
• a tensioning arm which, at a first end, is arranged at the torsion spring assembly so as to be aligned approximately radially relative to the longitudinal axis (A2);
• and
• a tensioning roller rotatably arranged at a second end of the tensioning arm, wherein an axis of rotation (A1) of the tensioning roller extends substantially parallel to the longitudinal axis (A2) of the torsion spring assembly and wherein the tensioning arm is resiliently supported relative to the rack so as to oscillate around the longitudinal axis (A2), and
• wherein the at least one torsion bar is enclosed by a tube in whose end arranged opposite the tensioning arm, there is secured in a rotationally fast way the respective end of the at least one torsion bar, and in whose other end the tensioning arm is supported in a radial bearing, wherein the tensioning arm is connected in a rotationally fast way to the other end of the at least one torsion bar and wherein a central plane of movement (E) of the tensioning roller is positioned in the central region of said radial bearing.

A belt tensioning device for a belt drive having at least two belt pulleys and a continuous belt, the device comprising:

• a torsion spring assembly with a longitudinal axis (A2) and at least one torsion bar, the torsion spring assembly adapted to be supported axially and radially in a rack;
• first and second tensioning arms which, at their respective one ends, are arranged at the torsion spring assembly so as to be aligned approximately radially relative to the longitudinal axis (A2);
• and
• first and second tensioning rollers which are rotatably arranged at the respective other ends of the first and second tensioning arms, wherein axes of rotation (A1, A3) of the first and second tensioning rollers extend substantially parallel to the longitudinal axis (A2) of the torsion spring assembly and wherein the first and second tensioning arms are resiliently supported around the longitudinal axis (A2) so as to oscillate relative to one another, and
• wherein the at least one torsion bar is enclosed by a tube in whose first end opposed to the first and second tensioning arms there is secured in a rotationally fast way the respective end of the at least one torsion bar, and on whose second end there is secured in a rotationally fast way the second tensioning arm, and wherein the first tensioning arm is supported in a radial bearing and is connected in a rotationally fast way to the other end of the at least one torsion bar, and wherein the central plane of movement (E) of the first and second tensioning rollers is positioned in a central region (A) of said radial bearing.

A belt tensioning device for a belt drive having at least two belt pulleys and a continuous belt, the device comprising:

• first and second torsion spring assemblies with respective longitudinal axes (A2, A4) extending parallel relative to one another and each having at least one torsion bar or torsion tube which can be supported axially and radially in a rack;
• first and second respective tensioning arms which each, at one end, are aligned approximately radially relative to the longitudinal axes (A2, A4) and arranged at the respective torsion spring assembly;
• and
• first and second respective tensioning rollers each rotatably arranged at the respective other end of the tensioning arms, wherein axes of rotation (A2, A3) of the first and second tensioning rollers extend substantially parallel relative to the longitudinal axes (A2, A4) of the first and second torsion spring assemblies and wherein the first and second torsion spring assemblies are coupled to one another so as to be rotatable either in the same direction or in opposite directions.