TENSIONING DEVICE FOR A BELT DRIVE
A tensioning device for a belt drive is provided, with a lever arm, which is rotatably supported on a base plate with a damping mechanism and on which a pulley and a spring element can be or are mounted. An arrangement is provided to prevent automatic loosening of the screw connection between the lever arm ( 3, 15 ) and the bearing.
1 . Tensioning device for a belt drive, comprising a lever arm, which is supported so that it can rotate on a base plate by a bearing with a damping mechanism and on which a pulley and a spring element can be or are mounted, and means are provided, for preventing automatic loosening of the screwed connection between the lever arm and the bearing.
2 . Tensioning device according to claim 1 , wherein the means comprise a bolt connected rigidly to the base plate and a flange.
3 . Tensioning device according to claim 2 , wherein the bolt and the base plate are constructed as an integral component.
4 . Tensioning device according to claim 2 , wherein the spring element is supported pre-tensioned on the lever arm.
5 . Tensioning device according to claim 4 , wherein the base plate and the lever arm are secured in a pre-tensioned state by a locking pin.
6 . Tensioning device according to claim 2 , wherein the base plate has a retaining element preventing rotation thereof and forming a positive lock.
7 . Tensioning device according to claim 6 , wherein the retaining element comprises a pin projecting from the base plate.
8 . Tensioning device according to claim 7 , wherein the pin projects axially or radially from the base plate.
9 . Tensioning device according to claim 6 , wherein the retaining element has a recess, which interacts with a corresponding complementary projection.
10 . Tensioning device according to claim 2 , wherein the bolt is constructed as an expanding screw.
11 . Tensioning device according to one of claim 2 , wherein threads of the bolt are provided with a microencapsulated bonding agent.