Tensioning device for a traction element and method of installation of such a device

Patent metadata

Field	Value
Publication number	US-9239097-B2
Application number	US-201313772435-A
Country	US
Kind code	B2
Filing date	Feb 21, 2013
Priority date	Feb 27, 2012
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

The invention relates to a tensioning device comprising a back plate, on which is installed a tensioning roller provided with at least one bearing. The tensioning roller is installed on the back plate with the possibility of rotation about an eccentric axis (X 6 ) in relation to the axis (X 4 ) of the tensioning roller. The tensioning roller is provided with a protuberance engaged in a peripheral recess of the back plate, this peripheral recess limiting the movement of the protuberance between two abutments.

First claim

The invention claimed is:

1. A tensioning device comprising:
a back plate configured to be secured to a wall by inserting at least two back plate securing elements through a respective one of at least two back plate mounting transcurrent openings therein, wherein the back plate is fixed with respect to the wall such that the back plate cannot pivot with respect to either of the at least two securing elements when the at least two back plate securing elements are engaged with the at least two back plate mounting transcurrent openings and the wall, and
a tensioning roller installed onto the back plate, the tensioning roller including;
at least one bearing, and
a pulley supported by the at least one bearing, the tensioning roller being installed on the back plate with a tension roller axis (X 4 ) capable of rotating about an eccentric axis (X 6 ) during installation of the tensioning device, the tensioning device is configured such that the tension roller axis (X 4 ) is fixed during normal operation, and
the tensioning roller is provided with a protuberance engaged in a peripheral recess produced exclusively on the periphery at the outer edge of a zone projecting from the back plate, the peripheral recess limiting the movement of the protuberance between two abutments wherein when the protuberance abuts either of the abutments the tensioning roller axially overlaps at least one of the back plate mounting transcurrent openings located in the back plate, the peripheral recess being configured for moving the tensioning roller prior to fixing the tension roller axis (X 4 ) for normal operation of the tensioning device, wherein the tensioning device is free of springs.

2. The tensioning device according to claim 1 , wherein the at least one bearing is installed securely on a roller support that is provided with the protuberance.

3. The tensioning device according to claim 2 , wherein the peripheral recess is produced on a maximum of one half of the circumference of the projecting zone.

4. The tensioning device according to claim 1 , wherein the peripheral recess is in the form of a sector of a circle according to a radial cross section in relation to the eccentric axis (X 6 ) about which the tensioning roller can move on the back plate during installation.

5. The tensioning device according to claim 1 , further comprising a screw inserted into a first screw transcurrent opening in the tensioning roller and into a second screw transcurrent opening in the back plate, the eccentric axis (X 6 ) of the screw being parallel although not combined with, the tension roller axis (X 4 ).

6. The tensioning device according to claim 1 , wherein a traction element is subjected to a force (F 1 ) exerted by the tensioning roller when the protuberance is in contact with the abutment corresponding to a final installed position of the tensioning device in the traction circuit.

7. The tensioning device according to claim 3 , wherein the peripheral recess is produced on one quarter of the circumference of the projecting zone.

8. The tensioning device according to claim 6 , wherein the peripheral recess is configured such that if during use the tensioning device malfunctions and the tensioning roller axis is no longer fixed, the tensioning roller will be biased into the proper position by the traction element being subjected to a force (F 2 ) exerted by the tensioning roller greater than (F 1 ) when disposed in an intermediate position of the protuberance in the peripheral recess of the back plate, with no contact with any of the two abutments, thus providing an anti-return feature.

9. An engine equipped with at least one traction circuit driven by a traction element and equipped with a tensioning device, the tensioning device comprising:
a back plate configured to be secured to a wall by inserting at least two back plate securing elements through a respective one of at least two back plate mounting transcurrent openings therein, wherein the back plate is fixed with respect to the wall such that the back plate cannot pivot with respect to either of the at least two securing elements when the at least two back plate securing elements are engaged with the at least two back plate mounting transcurrent openings and the wall, and
a tensioning roller installed onto the back plate, the tensioning roller including;
at least one bearing, and
a pulley supported by the at least one bearing, the tensioning roller being installed on the back plate with a tension roller axis (X 4 ) capable of rotating about an eccentric axis (X 6 ) during installation of the tensioning device, the tensioning device is configured such that the tension roller axis (X 4 ) is fixed during normal operation, and
the tensioning roller is provided with a protuberance engaged in a peripheral recess produced exclusively on the periphery at the outer edge of a zone projecting from the back plate, the peripheral recess limiting the movement of the protuberance between two abutments wherein when the protuberance abuts either of the abutments the tensioning roller axially overlaps at least one of the back plate mounting transcurrent openings located in the back plate, the peripheral recess being configured for moving the tensioning roller prior to fixing the axis (X 4 ) for normal operation of the tensioning device, wherein the tensioning device is free of springs.

Assignees

• Lescorail Romuald
• Tronquoy Nicolas
• Skf Ab

Inventors

• Lescorail Romuald
• Tronquoy Nicolas

Classifications

• F16H2007/0842

  Mounting or support of tensioner · CPC title

• F16H2007/0878

  Disabling during transport · CPC title

• F16H7/1281 Primary

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

• F16H7/12 Primary

  of an idle pulley · CPC title

• F16C23/10

  Bearings, parts of which are eccentrically adjustable with respect to each other · CPC title