Belt tensioning device with a belt drive

Patent metadata

Field	Value
Publication number	US-11629778-B2
Application number	US-202117372731-A
Country	US
Kind code	B2
Filing date	Jul 12, 2021
Priority date	Jul 20, 2020
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

A belt tensioning device includes a first tensioning arm mounted on a base body pivotably about a first pivot axis and includes a rotatable first tensioning roller. A second tensioning arm is pivotably mounted relative to the base body about a second pivot axis and includes a rotatable second tensioning roller. Via a spring arrangement between the first tensioning arm and the second tensioning arm, the first and second tensioning arms are resiliently supported against one another in the circumferential direction. A damping mechanism is operatively arranged between the base body and the first tensioning arm for damping relative rotational movement between the first tensioning arm and the base body.
The damping mechanism generates a varying damping torque dependent on the rotational position and/or rotational direction of the first tensioning arm relative to the base body upon pivoting of the first tensioning arm relative to the base body.

First claim

The invention claimed is:

1. A belt tensioning device, comprising:
a base body,
a first tensioning arm, including a rotatable first tensioning roller, pivotably mounted on the base body such that the first tensioning arm is pivotable about a first pivot axis;
a second tensioning arm, including a rotatable second tensioning roller, pivotably mounted relative to the base body such that the second tensioning arm is pivotable about a second pivot axis;
a spring arrangement provided between the first tensioning arm and the second tensioning arm and via which the first tensioning arm and the second tensioning arm are resiliently supported against one another in a circumferential direction; and
a damping mechanism operatively arranged between the base body and the first tensioning arm for damping relative rotational movement between the first tensioning arm and the base body;
wherein the damping mechanism generates a varying damping torque dependent on at least one of a rotational position or a rotational direction of the first tensioning arm relative to the base body upon pivoting the first tensioning arm relative to the base body; and
wherein different values for a coefficient of friction exist over a circumference between a bearing surface of the base body and a bearing surface of the first tensioning arm.

2. The belt tensioning device of claim 1 ,
wherein in a central rotational position of the first tensioning arm relative to the base body, when the first tensioning arm is pivoted relative to the base body, the damping mechanism generates a damping torque which is smaller than a damping torque in at least one pivoted-out rotational position of the first tensioning arm relative to the base body which differs from the central rotational position.

3. The belt tensioning device of claim 1 ,
wherein a spring element is arranged radially between the base body and the first tensioning arm and is held in a rotationally fixed manner on one of the base body and the first tensioning arm,
wherein, in a central rotational position of the first tensioning arm relative to the base body, the spring element is arranged in a circumferential overlap with a recess in the other one of the base body and the first tensioning arm, and
wherein, in a pivoted-out rotational position of the first tensioning arm relative to the base body which differs from the central rotational position, the spring element is pretensioned and is arranged exerting a radial force between the bearing surface of the base body and the bearing surface of the first tensioning arm surface of the first tensioning arm.

4. The belt tensioning device of claim 1 ,
wherein between the bearing surface of the base body and the bearing surface of the first tensioning arm have a same cross-sectional profile in the circumferential direction, the cross-sectional profile deviating from a circular shape.

5. The belt tensioning device of claim 1 ,
wherein the damping mechanism generates a higher damping torque when the first tensioning arm is pivoted relative to the base body starting from a central rotational position of the first tensioning arm relative to the base body in a direction towards a pivoted-out rotational position which deviates from the central rotational position than when the first tensioning arm is pivoted relative to the base body starting from theft pivoted-out rotational position of the first tensioning arm relative to the base body in a direction towards the central rotational position.

6. The belt tensioning device of claim 1 ,
wherein a spring element is arranged radially between the base body and the first tensioning arm and is held in a rotationally fixed manner by one of the base body and the first tensioning arm, and
wherein the spring element is radially pretensioned in a first pivoting direction of the first tensioning arm relative to the base body and is arranged so as to be radially free in a second pivoting direction opposite the first pivoting direction.

7. The belt tensioning device of claim 1 ,
wherein the second tensioning arm is mounted on the first tensioning arm such that it can pivot about the second pivot axis, and
wherein a damping mechanism is operatively arranged between the first tensioning arm and the second tensioning arm for damping a relative rotational movement between the first tensioning arm and the second tensioning arm.

8. A belt tensioning device, comprising:
a base body;
a first tensioning arm, including a rotatable first tensioning roller, pivotably mounted on the base body such that the first tensioning arm is pivotable about a first pivot axis;
a second tensioning arm, including a rotatable second tensioning roller, pivotably mounted relative to the base body such that the second tensioning arm is pivotable about a second pivot axis;
a spring arrangement provided between the first tensioning arm and the second tensioning arm and via which the first tensioning arm and the second tensioning arm are resiliently supported against one another in a circumferential direction; and
a damping mechanism operatively arranged between the base body and the first tensioning arm for damping relative rotational movement between the first tensioning arm and the base body;
wherein the damping mechanism generates a varying damping torque de-pendent on at least one of a rotational position or a rotational direction of the first tensioning arm relative to the base body upon pivoting the first tensioning arm relative to the base body;
wherein a spring element is arranged radially between the base body and the first tensioning arm and is held in a rotationally fixed manner on one of the base body and the first tensioning arm;
wherein, in a central rotational position of the first tensioning arm relative to the base body, the spring element is arranged in a circumferential overlap with a recess in the other one of the base body and the first tensioning arm; and
wherein, in a pivoted-out rotational position of the first tensioning arm relative to the base body which differs from the central rotational position, the spring element is pretensioned and is arranged exerting a radial force between a bearing surface of the base body and a bearing surface of the first tensioning arm.

9. The belt tensioning device of claim 8 ,
wherein in the central rotational position of the first tensioning arm relative to the base body, when the first tensioning arm is pivoted relative to the base body, the damping mechanism generates a damping torque which is smaller than a damping torque in the pivoted-out rotational position of the first tensioning arm relative to the base body which differs from the central rotational position.

10. The belt tensioning device of claim 8 ,
wherein different values for a coefficient of friction exist over a circumference between the bearing surface of the base body and the bearing surface of the first tensioning arm.

11. The belt tensioning device of claim 8 ,
wherein between the bearing surface of the base body and the bearing surface of the first tensioning arm have a same cross-sectional profile in the circumferential direction, the cross-sectional profile deviating from a circular shape.

12. The belt tensioning device of claim 8 ,
wherein the damping mechanism generates a higher damping torque when the first tensioning arm is pivoted relative to the base body starting from the central rotational position the first tensioning arm relative to the base body in a direction towards the pivoted-out rotational position which deviates from the central rotational position than when the first tensioning arm is pivoted relative to the base body starting from the pivoted

Assignees

• Muhr & Bender Kg

Inventors

• Stadermann Florian
• Jud Joachim
• Pfeifer Simon
• Jung Manfred

Classifications

• F16H7/1209 Primary

  with vibration damping means · CPC title

• F16H2007/0865

  Pulleys · CPC title

• F16H2007/0874

  Two or more finally actuated members · CPC title

• F16H7/08 Primary

  Means for varying tension of belts, ropes or chains  (pulleys of adjustable construction F16H55/52) · CPC title

• F16H2007/0897

  External to internal direction · CPC title