Camshaft adjuster

Patent metadata

Field	Value
Publication number	US-9840942-B2
Application number	US-201414911566-A
Country	US
Kind code	B2
Filing date	Aug 7, 2014
Priority date	Aug 14, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A camshaft adjusting device for an internal combustion engine, comprising a housing comprising a bearing sleeve arranged to be concentrically disposed on a camshaft, the bearing sleeve arranged to be guided through a cylinder head wall, an annular gap arranged to be inside the cylinder head, the annular gap arranged to be formed between the bearing sleeve and the camshaft, an adjusting mechanism comprising a control shaft arranged within the housing, a traction mechanism comprising a drive gear secured to the bearing sleeve outside the cylinder head, and a ball bearing arranged within the drive gear and securing the control shaft within the adjusting mechanism.

First claim

What is claimed is:

1. A camshaft adjusting device for an internal combustion engine, comprising:
a housing comprising a bearing sleeve arranged to be concentrically disposed on a camshaft, said bearing sleeve arranged to be guided through a cylinder head wall of a cylinder head;
an annular gap arranged to be inside said cylinder head, said annular gap arranged to be formed between said bearing sleeve and said camshaft;
an adjusting mechanism comprising a control shaft arranged within said housing;
a traction mechanism comprising a drive gear secured to said bearing sleeve outside said cylinder head; and,
a ball bearing arranged within said drive gear and securing said control shaft within said adjusting mechanism.

2. The camshaft adjusting device recited in claim 1 , further comprising:
a first sealing ring sealing said bearing sleeve from said control shaft.

3. The camshaft adjusting device recited in claim 2 , wherein an outside diameter of said first sealing ring is smaller than a maximum diameter of said camshaft.

4. The camshaft adjusting device recited in claim 2 , further comprising:
a second sealing ring, wherein:
said second sealing ring seals said bearing sleeve from said cylinder head wall; and,
an inside diameter of said second sealing ring is smaller than an outside diameter of said first sealing ring.

5. The camshaft adjusting device recited in claim 2 , wherein a maximum outside diameter of said bearing sleeve is at most 30% larger than a maximum outside diameter of said camshaft.

6. The camshaft adjusting device recited in claim 1 , further comprising:
a first inner tooth arrangement formed directly on an inner circumference of said bearing sleeve, wherein said bearing sleeve forms a transmission component of said adjusting mechanism.

7. The camshaft adjusting device recited in claim 6 , wherein said adjusting mechanism comprises a second inner tooth arrangement arranged to be disposed on an inside of said cylinder head wall.

8. The camshaft adjusting device recited in claim 1 , wherein:
a section of said adjusting mechanism is arranged to be located inside said camshaft at a length, measured in the axial direction of said camshaft; and,
the length is greater than a maximum outside diameter of the camshaft.

9. The camshaft adjusting device recited in claim 1 , wherein said adjusting mechanism is designed as a triple shaft gear mechanism.

10. The camshaft adjusting device recited in claim 1 , wherein said housing of said adjusting mechanism encloses a lubricant chamber.

11. The camshaft adjusting device recited in claim 1 , wherein said drive gear is designed as a belt pulley.

Assignees

• Schaeffler Technologies Ag

Inventors

• Zwahr Sebastian
• Schaefer Jens

Classifications

• F01L1/344

  changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear · CPC title

• F01L1/46

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

• F01L1/34 Primary

  characterised by the provision of means for changing the timing of the valves without changing the duration of opening {and without affecting the magnitude of the valve lift} · CPC title

• F01L1/34403 Primary

  using helically teethed sleeve or gear moving axially between crankshaft and camshaft · CPC title

• F01L2001/0475

  Hollow camshafts · CPC title