Shaft, particularly a partly tubular camshaft

Patent metadata

Field	Value
Publication number	US-9803514-B2
Application number	US-201213979401-A
Country	US
Kind code	B2
Filing date	Feb 2, 2012
Priority date	Feb 2, 2011
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The invention relates to a shaft, particularly a cam shaft ( 1 ), comprising a hollow shaft section ( 10 ) with at least one radial inlet opening ( 11 a, 11 b ) for evacuating a gas through said hollow shaft section ( 10 ), and comprising a splash-guard device ( 4 ) arranged in the region of the radial inlet opening ( 11 a, 11 b ) on the hollow shaft section ( 10 ). According to the invention, the splash-guard device ( 4 ) has a radially exposed cover with radial passage openings ( 8 ) and protrusions between said passage openings ( 8 ). The protrusions can, in particular, be in the form of ribs ( 9 ).

First claim

The invention claimed is:

1. A camshaft comprising:
a tubular part extending along and rotatable about an axis and formed with a radial intake port for conducting a gas radially into the radial intake port and axially through the tubular part;
a plurality of cams spaced along the tubular part; and
a splash guard mounted on the tubular part at the radial intake port between adjacent cams for joint rotation with the tubular part and having a radially outwardly exposed and tubular center section coaxially surrounding the tubular part between the cams and formed with radially throughgoing holes and radially and axially extending ribs between and offset from the holes, the center section of the splash guard and the tubular shaft part forming a radial gap at the intake port, the holes being offset axially or angularly on the tubular shaft part from the intake port for gas flow into the openings, then axially or angularly along the gap around the tubular part, and then radially into the intake port and into the tubular part.

2. The shaft defined in claim 1 , wherein the tubular part has a predetermined forward rotation direction, and the ribs are angled and have free ends that extend rearward relative to the predetermined forward rotation direction.

3. The shaft defined in claim 1 , wherein the tubular part has a predetermined rotation direction, and a respective one of the ribs is provided upstream of each hole in the rotation direction.

4. The shaft defined in claim 1 , wherein the holes are axial slots.

5. The shaft defined in claim 1 , wherein the splash guard has radially enlarged ends as viewed axially of the shaft.

6. The shaft defined in claim 5 , wherein each of the radially enlarged ends is juxtaposed with a respective one of the cams and the tubular center section extends between the radially enlarged ends.

7. The shaft defined in claim 1 , wherein the ribs and the radially throughgoing holes are distributed in a uniform arrangement pair-wise angularly of the center section.

8. The shaft defined in claim 1 , further comprising:
a bypass valve inside the tubular shaft part.

9. The shaft defined in claim 1 , wherein the splash guard is composed of two axially joined segments.

10. The shaft defined in claim 1 , wherein the splash guard is bonded with adhesive to the tubular shaft part.

11. The shaft defined in claim 1 , wherein the splash guard and the tubular part include interfitting positive-locking elements.

12. The shaft defined in claim 1 , wherein the tubular center section is spaced radially outward by the gap from the tubular part.

Assignees

• Mueller Ulf
• Thyssenkrupp Presta Tecct Ag

Inventors

• Mueller Ulf

Classifications

• F01L2001/0475

  Hollow camshafts · CPC title

• F01L1/46

  Component parts, details, or accessories, not provided for in preceding subgroups · CPC title

• F01M2013/0422

  Separating oil and gas with a centrifuge device · CPC title

• Y10T74/2101

  Cams · CPC title

• F02B67/06

  driven by means of chains, belts, or like endless members · CPC title