Bearing system and gear unit

Patent metadata

Field	Value
Publication number	US-10066731-B2
Application number	US-201414766345-A
Country	US
Kind code	B2
Filing date	Jan 29, 2014
Priority date	Feb 7, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A bearing system having a housing component, a shaft being supported in the housing component with the aid of a bearing, especially using a roller bearing, wherein the bearing is accommodated in a stepped bore in the housing component, which especially extends through the housing component, a lid part seals the stepped bore, especially with respect to the outside, the lid part is frictionally connected to the housing component, the lid part is accommodated in the stepped bore, a surface section of the outside of the lid part is situated in alignment with a step of the stepped bore, in particular in such a way that the surface section is situated on an axial position of the step.

First claim

The invention claimed is:

1. A gear unit, comprising:
a bearing system that includes:
a housing component;
a bearing;
a shaft supported in the housing component with the aid of a bearing, wherein:
the bearing is accommodated in a stepped bore in the housing component, and
the stepped bore extends through the housing component; and

a lid part that seals the stepped bore and is frictionally connected to the housing component, the lid part being accommodated in the stepped bore, wherein a surface section of an outer side of the lid part is in flush alignment with a step of the stepped bore, wherein:
a housing of the gear unit surrounds all toothed elements of the gear unit and accommodates bearings of the gear unit,
the housing includes a frame section and a cladding section, the frame section and the cladding section being at least one of developed in one piece and connected in an integral fashion,
the frame section includes a greater wall thickness than the cladding section,
the frame section includes two outer leg sections and a center leg section,
each outer leg section is situated at a nonvanishing angle to the center leg section,
at least one outer leg section includes at least one annular section,
the annular section is developed in one piece with the outer leg section,
the center leg section includes a support section, and
the support section is developed in one piece with the center leg section;

a clutch housing connected to the frame section, wherein:
an outer circumference of the clutch housing tapers in a direction of the housing, and
a step is provided in an inner diameter of the clutch housing toward the housing, so that a wall thickness of the clutch housing increases in a stepwise manner.

2. The gear unit as recited in claim 1 , wherein the bearing is a roller bearing.

3. The gear unit as recited in claim 1 , wherein the lid part seals the stepped bore with respect to an outside.

4. The gear unit as recited in claim 1 , wherein the outer side is in flush alignment with the step so that the surface section is disposed on an axial position of the step.

5. The gear unit as recited in claim 1 , wherein an inner diameter of the stepped bore decreases monotonously in a bore direction corresponding to an axial direction and in a direction of a shaft axis.

6. The gear unit as recited in claim 5 , wherein the step of the stepped bore includes a bevel.

7. The gear unit as recited in claim 5 , wherein the inner diameter is an inside diameter.

8. The gear unit as recited in claim 1 , wherein an axial position of the surface section is an axial position of the lid part that lies farthest from the bearing.

9. The gear unit as recited in claim 1 , further comprising:
a retaining ring axially situated between the bearing and the lid part, inside a radially oriented annular groove of the stepped bore.

10. The gear unit as recited in claim 9 , wherein:
the retaining ring is set apart from the lid part.

11. The gear unit as recited in claim 9 , further comprising:
a spacer ring situated axially between the retaining ring and an outer ring of the bearing, wherein the retaining ring together with the spacer ring axially delimits the outer ring of the bearing.

12. The gear unit as recited in claim 1 , wherein:
the lid part is in the form of a cup,
the lid part includes a base section and a wall section,
a wall thickness of the wall section increasing monotonously in a direction of the base section,
an outer radius of the wall section increasing linearly toward the base section in an axial end region facing the bearing, and
an inner radius of the wall section increasing in a stepwise manner.

13. The gear unit as recited in claim 1 , wherein:
the lid part includes a sheet-metal part,
the sheet-metal part is at least partially coated with a plastic coating,
the plastic coating is situated radially between the sheet-metal part and the housing component, and
the plastic coating is elastically deformed in such a way that the plastic coating seals the sheet-metal part with respect to the housing component.

14. The gear unit as recited in claim 13 , wherein:
the sheet-metal part includes a steel plate that is a punched and bent part.

15. The gear unit as recited in claim 13 , wherein the plastic coating includes an elastomer.

16. The gear unit as recited in claim 13 , wherein:
a radius of the shaft decreases toward the bearing in a stepwise manner,
a step in the shaft is set apart from an inner ring of the bearing,
a maximum outer radius of the shaft is greater than an inner radius of the inner ring,
a bushing is situated on the shaft and touches the inner ring,
an inner diameter of the bushing is greater than the inner diameter of the inner ring,
an outer diameter of the bushing is smaller than the outer diameter of the inner ring,
the bushing is axially situated between a toothed wheel connected to the shaft and the inner ring, and
at least one rolling element is situated between the inner ring and an outer ring of the bearing.

17. The gear unit as recited in claim 1 , wherein the outer leg sections and the center leg section are situated in a U-shape.

18. The gear unit as recited in claim 1 , wherein at least one of:
a plane is defined by the outer leg sections and the center leg section, the plane being aligned at least one of horizontally and essentially parallel to a base surface of the housing,
the wall thickness of the frame section is greater than in any other region of the housing, and
at least one annular section of each outer leg section has at least one bearing seat in each case, in which a bearing is accommodated for support of at least one shaft of the gear unit, an output shaft of the gear unit being supported with the aid of bearings in the annular sections of the outer leg sections.

19. The gear unit as recited in claim 1 , wherein:
the support section at least one of overhangs the center leg section as an outwardly directed protrusion and projects therefrom, the support section being realized as a tab on the center leg section,
the support section is connected to a support element in a detachable manner, and
the support section has a bore, a bore direction being implemented perpendicularly to a plane spanned by the outer leg sections and the center leg section.

20. The gear unit as recited in claim 1 , wherein:
the cladding section includes a reinforcement surface section,
an extension of the housing decreases monotonously from an output shaft of the gear unit to an input shaft of the gear unit in a direction perpendicular to an axis of the output shaft and perpendicularly to the outer leg sections,
a normal vector of the essentially planar reinforcement surface section stands at a nonvanishing angle to a normal vector of a plane defined by the outer leg sections and the center leg section.

21. The gear unit as recited in claim 20 , wherein:
the extension is a height of the housing,
the extension decreases linearly in a longitudinal section of the housing parallel to at least one of the outer leg sections.

22. A gear unit, comprising:
a bearing system that includes:
a housing component;
a bearing;
a shaft supported in the housing component with the aid of a bearing, wherein:
the bearing is accommodated in a stepped bore in the housing component, and
the stepped bore extends through the housing component;

a lid part that seals the stepped bore and is frictionally connected

Assignees

• Sew Eurodrive Gmbh & Co

Inventors

• Barton Peter
• Dietrich Stefan
• Becker Renaud
• Wöppermann Markus

Classifications

• F16H57/029

  characterised by means for sealing the gearboxes, e.g. to improve airtightness · CPC title

• F16H57/03

  characterised by means for reinforcing gearboxes, e.g. ribs · CPC title

• F16H57/021 Primary

  Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings · CPC title

• F16H57/025

  Support of gearboxes, e.g. torque arms, or attachment to other devices · CPC title

• F16H57/033

  Series gearboxes, e.g. gearboxes based on the same design being available in different sizes or gearboxes using a combination of several standardised units · CPC title