Abstract: A belt tensioning device comprises a base member; at least one tensioning arm which, relative to the base member, is pivotably supported around a pivot axis; a tensioning roller for tensioning the belt; a spring for resiliently supporting the tensioning arm; and a connecting assembly for connecting the tensioning arm to the base member, wherein the connecting assembly comprises at least two base member connecting portions and at least two tensioning arm connecting portions which are connected to one another by an insertion and rotational movement; wherein, between a first base member connecting portion and a first tensioning arm connecting portion a first contact surface region is formed which is greater than a second contact surface region which is formed between a second base member connecting portion and a second tensioning arm connecting portion.

Abstract: The present invention relates to an accessory drive belt tensioner for use in an engine for motor vehicles, comprising a base, a tensioner arm and a pulley mounted on the tensioner arm, wherein the base and the tensioner arm are arranged in a pivotal arrangement, the base and the tensioner arm are tension loaded and the pivotal arrangement confines a space being aimed for receiving a generator pulley, wherein the tensioner arm is made of a specific thermally conductive plastic composition; comprises cooling fins, the cooling fins being positioned in the vicinity of, or at least partially inside the space confined by the pivotal arrangement; and comprises a bearing surface part, for sliding contact with the base (A) within the pivotal arrangement, consisting of metal.

Abstract: A belt tensioning device for a belt drive comprises a base member that is firmly connectable to a stationary component; at least one tensioning arm, which is pivotably supported relative to the base member around a pivot axis; a spring element, with which the tensioning arm is supported elastically in circumferential direction, wherein the ratio of the nominal diameter to the axial length of the spring element is larger than 3.0 in the mounted condition; and a tensioning roller for tensioning the belt, which is rotatably supported on the tensioning arm around an axis of rotation; wherein the base member and the tensioning arm are each at least partially made from plastic material.

Abstract: A belt tensioning device comprises a base member; at least one tensioning arm which, relative to the base member, is pivotably supported around a pivot axis; a tensioning roller for tensioning the belt; a spring for resiliently supporting the tensioning arm; and a connecting assembly for connecting the tensioning arm to the base member, wherein the connecting assembly comprises at least two base member connecting portions and at least two tensioning arm connecting portions which are connected to one another by an insertion and rotational movement; wherein, between a first base member connecting portion and a first tensioning arm connecting portion a first contact surface region is formed which is greater than a second contact surface region which is formed between a second base member connecting portion and a second tensioning arm connecting portion.

Abstract: A belt tensioning device for a belt drive comprises a base member that is firmly connectable to a stationary component; at least one tensioning arm, which is pivotably supported relative to the base member around a pivot axis; a spring element, with which the tensioning arm is supported elastically in circumferential direction, wherein the ratio of the nominal diameter to the axial length of the spring element is larger than 3.0 in the mounted condition; and a tensioning roller for tensioning the belt, which is rotatably supported on the tensioning arm around an axis of rotation; wherein the base member and the tensioning arm are each at least partially made from plastic material.