Hydraulic tensioning device for a chain drive

Patent metadata

Field	Value
Publication number	US-11054003-B2
Application number	US-201716099041-A
Country	US
Kind code	B2
Filing date	May 3, 2017
Priority date	May 4, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A hydraulic tensioning device for a chain drive, having a tensioning piston which is guided in a holder and which, on its outer circumferential surface, has locking grooves, an inner guide which projects into a cavity of the piston, and a locking element which has at least two annular sections and at least two radial extensions, wherein the locking element can be placed in engagement by the at least two annular sections with one of the locking grooves, and having a clamping stop and a sliding stop which are axially spaced apart from one another. To simplify the structural design, the holder has at least two axial extensions which extend in an axial direction between the clamping stop plane and the sliding stop plane, wherein the at least two axial extensions and the tensioning piston do not enclose the at least two radial extensions.

First claim

The invention claimed is:

1. A hydraulic tensioning device for a chain drive, the hydraulic tensioning device comprising:
a holder;
a tensioning piston that is guided in the holder, the tensioning piston has locking grooves located on an outer peripheral surface thereof;
an inner guide that extends into a hollow space of the piston;
a locking element that has at least two annular sections and at least two radial extensions, the locking element is movable into engagement with one of the locking grooves with the at least two annular sections thereof;
a clamping stop and a sliding stop that are spaced apart from each other in an axial direction on the holder,
at least two axial extensions on the holder that extend in the axial direction between a clamping stop plane defined by the clamping stop and a sliding stop plane defined by the sliding stop that are arranged separated from each other in an area of the sliding stop plane, the at least two axial extensions partially enclose a periphery of the at least two radial extensions but do not fully enclose the at least two radial extensions.

2. The hydraulic tensioning device according to claim 1 , wherein two of the at least two axial extensions enclose a locking section in a peripheral direction, and one of the at least two annular sections is movable into engagement with one of the locking grooves in an area of the locking section.

3. The hydraulic tensioning device according to claim 2 , wherein the locking element has exactly two of the annular sections and exactly two of the radial extensions and the holder has exactly two of the axial extensions that enclose two locking sections in a circumferential direction.

4. The hydraulic tensioning device according to claim 1 , wherein the holder comprises a cylindrical hollow space, the tensioning piston is guided by the cylindrical hollow space or the holder comprises a cylindrical hollow space and the tensioning piston is guided by the inner guide.

5. The hydraulic tensioning device according to claim 1 , wherein the at least two axial extensions each have a tapered section on both sides in a peripheral direction in an axial section between the clamping stop plane and the sliding stop plane, and the sliding stop is formed in the sliding stop plane.

6. The hydraulic tensioning device according to claim 1 , wherein one of the at least two radial extensions defines a gap in the locking element.

7. The hydraulic tensioning device according to claim 6 , wherein in an area of the gap of the locking element, two end sections of the locking element extend in a direction opposite each other, and partial sections of the two end sections are spaced apart from each other in a peripheral direction, extend outward in a radial direction, and are movable into contact with the sliding stop.

8. The hydraulic tensioning device according to claim 7 , further comprising actuation sections that connect to the partial sections in a direction of the gap of the locking element, and the actuation sections extend in a direction of the opposite end section.

9. The hydraulic tensioning device according to claim 1 , wherein one of the at least two radial extensions has a tapered section and includes a gap of the locking element, and the locking element into contact with the sliding stop in an area of the tapered section.

10. The hydraulic tensioning device according to claim 9 , wherein the locking element includes a first end and a second end that enclose the gap, and in a peripheral direction a distance between the first end and the second end is greater than a distance between partial areas of the locking element that form the tapered section.

11. A hydraulic tensioning device for a chain drive, the hydraulic tensioning device comprising:
a holder;
a tensioning piston guided in the holder, the tensioning piston including locking grooves on an outer peripheral surface thereof;
an inner guide that extends into a hollow space of the piston;
a locking element that has two annular sections and two radial extensions, the locking element is movable into engagement with one of the locking grooves with the two annular sections thereof;
a clamping stop and a sliding stop that are spaced apart from each other in an axial direction on the holder;
two axial extensions on the holder, the sliding stop being located on the axial extensions, the two axial extensions extend in the axial direction between a clamping stop plane defined by the clamping stop and a sliding stop plane defined by the sliding stop, the two axial extensions are arranged separated from each other on opposite sides of the tensioning piston in an area of the sliding stop plane, the two radial extensions of the locking element extend radially beyond the two axial extensions and the tensioning piston, and the two axial extensions each include an enlarged head portion and a connecting portion that is smaller than the enlarged head portion.

12. The hydraulic tensioning device according to claim 11 , wherein the two axial extensions enclose a locking section in a peripheral direction, and one of the two annular sections is movable into engagement with one of the locking grooves in an area of the locking section.

13. The hydraulic tensioning device according to claim 11 , wherein the tensioning piston is guided by a cylindrical hollow space in the holder or by the inner guide located in the cylindrical hollow space in the holder.

14. The hydraulic tensioning device according to claim 11 , wherein the two axial extensions each have a tapered section on both sides in a peripheral direction in an axial section between the clamping stop plane and the sliding stop plane.

15. The hydraulic tensioning device according to claim 11 , wherein one of the two radial extensions defines a gap in the locking element that allows movement of the two annular sections away from one another.

16. The hydraulic tensioning device according to claim 15 , wherein in an area of the gap of the locking element, two end sections of the locking element extend in a direction opposite each other.

17. The hydraulic tensioning device according to claim 11 , wherein each of the two radial extensions extends around a respective one of the axial extensions.

18. The hydraulic tensioning device according to claim 11 , wherein the two radial extensions each have a tapered section, and the locking element is movable axially into contact with the sliding stop in an area of the tapered section.

19. The hydraulic tensioning device according to claim 11 , wherein two axial extensions have a T-shaped construction.

Assignees

• Schaeffler Technologies Ag

Inventors

• Fuhrmann Rainer

Classifications

• F16H2007/0855

  comprising a clip member engaging with the rack teeth · CPC title

• F16H2007/0891

  Linear path · CPC title

• F16H2007/0859

  Check valves · CPC title

• F16H2007/0878

  Disabling during transport · CPC title

• F16H2007/0812

  Fluid pressure · CPC title