Starter generator belt tensioner

Patent metadata

Field	Value
Publication number	US-9625013-B2
Application number	US-201314767145-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Feb 22, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A generator arrangement for an auxiliary-assembly belt drive of an internal combustion engine, having a starter generator ( 1 ) with a belt pulley ( 6 ) and a belt tensioner ( 2 ) which includes the following:—a first tensioning lever ( 8 ) with a first tensioning roller ( 4 ),—a second tensioning lever ( 9 ) with a second tensioning roller, these tensioning rollers being arranged in front of and behind the belt pulley in a circulating direction of the belt ( 3 ) and applying a pretensioning force onto the belt,—a spring means ( 7 ) which is arranged between the tensioning levers and which moves the tensioning rollers towards each other, thereby generating the pretensioning force,—and a locking arrangement ( 11 ), by which the tensioning levers can be locked relative to each other in a position in which the tensioning rollers are moved away from each other, thereby reducing or canceling the pretensioning force. The generator arrangement also includes another locking means ( 15 ) by which one of the tensioning levers can be locked relative to the starter generator.

First claim

The invention claimed is:

1. A generator arrangement for an auxiliary unit belt drive of an internal combustion engine with a starter generator having a belt pulley and a belt tensioner, the generator arrangement comprises:
a first tensioning lever with a first tensioning roller,
a second tensioning lever with a second tensioning roller, wherein the tensioning rollers are arranged in front of and behind the belt pulley in a circulating direction of the belt and apply a pretensioning force onto the belt,
a spring element that is tensioned between the tensioning levers and moves the tensioning rollers toward each other while generating the pretensioning force,
and a locking element by which the tensioning levers are locked relative to each other in a position in which the tensioning rollers are moved away from each other while reducing or cancelling out the pretensioning force, and
an additional locking element by which one of the tensioning levers is locked relative to the starter generator.

2. The generator arrangement according to claim 1 , wherein the first tensioning lever is a circular arc-shaped tensioning arm that is loaded on one end by a force of the spring element and supports, on another end, the first tensioning roller, and the second tensioning lever forms a tensioner housing on which the second tensioning roller is supported fixed to the housing, the tensioner housing is supported so that it is rotatable concentric to the belt pulley on one end face of the starter generator and has a circular arc-shaped cavity in which the spring element comprising one or more bow springs and the tensioning arm are supported movably in a plane of the circular arc.

3. The generator arrangement according to claim 2 , wherein the rotational support of the tensioner housing is a circular ring-shaped sliding bearing that runs on one side on the end face of the starter generator and on another side on a ring flange connected rigidly to the starter generator by which the tensioner housing is held on the starter generator.

4. The generator arrangement according to claim 2 , wherein one or both locking elements comprise two recesses or holes that can be moved relative to each other into a locking position in which a locking pin is inserted in the locking position.

5. The generator arrangement according to claim 3 , wherein the additional locking element is formed by a first hole or recess in the tensioner housing and by a second hole or recess in the ring flange axially offset relative to the first hole or recess, and the associated locking pin is a securing clip.

6. The generator arrangement according to claim 5 , wherein the holes or recesses forming the additional locking elements are positioned so that the holes or recesses automatically move in a direction of the locking position when the internal combustion engine is turned off.

7. A belt tensioner for an auxiliary unit belt drive of an internal combustion engine that has a starter generator with a belt pulley, wherein the belt tensioner comprises:
a first tensioning lever with a first tensioning roller,
a second tensioning lever with a second tensioning roller, wherein the tensioning rollers are arranged in front of and behind the belt pulley in a circulating direction of the belt and apply a pretensioning force onto the belt,
a spring element that is clamped between the tensioning levers and moves the tensioning rollers toward each other while generating the pretensioning force,
a locking element by which the tensioning levers are locked relative to each other in a position in which the tensioning rollers are moved away from each other while reducing or cancelling out the pretensioning force,
and a connection element mounted on the starter generator for holding the belt tensioner on the starter generator, and an additional locking element by which one of the tensioning levers is locked relative to the connection element.

Assignees

• Schaeffler Technologies Ag

Inventors

• Wolf Benjamin
• Lorz Wolfgang

Classifications

• F16H2007/0806

  Compression coil springs · CPC title

• F16H7/1209 Primary

  with vibration damping means · CPC title

• F16H2007/0878

  Disabling during transport · CPC title

• F16H2007/0842

  Mounting or support of tensioner · CPC title

• F16H7/1281 Primary

  where the axis of the pulley moves along a substantially circular path · CPC title