DEVICE FOR THE COMBINED LOCKING AND ROTATION ANGLE LIMITATION OF A CAMSHAFT ADJUSTER

• US 20100101516A1
• Filed: 12/20/2007
• Published: 04/29/2010
• Est. Priority Date: 01/27/2007
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Hertrich, Steffen
• Granted Patent: US 8,166,934 B2
• Time in Patent Office: Days
• US Class Current: 123/90.170
• CPC Class Codes: F01L 1/3442 using hydraulic chambers with variable volume to transmit the rotating force
• CPC Class Codes: F01L 2001/34453 Locking means between driving and driven members
• CPC Class Codes: F01L 2001/34459 Locking in multiple positions
• CPC Class Codes: F01L 2001/34469 Lock movement parallel to camshaft axis
• CPC Class Codes: F01L 2001/34483 Phaser return springs

Abstract

A locking and rotation angle device for locking and setting maximum rotational adjustability of a drive part fixed to the crankshaft and a driven part fixed to the camshaft of a camshaft adjuster. The driven part is pivotably adjusted to the drive part, which has a locking bar received in the drive or driven part, a locking bar member formed in the respectively other part, and a rotation angle limiting member formed in the correspondingly other part. Limiting wall sections serve as stops for the locking bar for adjusting a maximum rotational adjustability. The locking bar member, rotation angle limiting member, and locking bar are disposed such that the locking bar is displaced via the displacement mechanism into a locking position, engaging into the locking bar member, and into an unlocking position, in which it is released by the locking bar member and engages in the rotation angle limiting member.

Claims

1. A combined locking and rotational angle limiting device for locking and setting a maximum rotational adjustability of a drive input part, which is fixed with respect to a crankshaft, and a drive output part, which is rotatably adjustable relative to said drive input part and which is fixed with respect to a camshaft, of a camshaft adjuster for an internal combustion engine, comprising:

a bar which is held in the drive input or drive output part and which is moved by a movement mechanism, having a bar slot formed in a corresponding other part and by means of which the bar can be is held in a positively locking fashion in a circumferential direction, and having a rotational angle limiting slot formed in the corresponding other part and by means of which the bar is held in the circumferential direction with a spacing, with substantially radial boundary wall sections which are spaced apart in the circumferential direction serving as stops for the bar in order to set a maximum rotational adjustability of both the drive input and drive output part, with the bar slot, the rotational angle limiting slot and the bar being arranged in such a way that the bar is moved by the movement mechanism into a locked position, in which said bar is guided by the bar slot, and into an unlocked position, in which said bar is guided by the rotational angle limiting slot.

2. The combined locking and rotational angle limiting device of claim 1, wherein the bar slot is arranged within an axial extension, in a bar movement direction, of the rotational angle limiting slot.

3. The combined locking and rotational angle limiting device of claim 2, wherein the bar slot and the rotational angle limiting slot are offset in an axial direction.

4. The combined locking and rotational angle limiting device of claim 1, wherein the bar slot and the rotational angle limiting slot are formed in the manner of a stepped slot.

5. The combined locking and rotational angle limiting device of claim 4, wherein a substantially radial boundary wall section, which runs behind in a rotational direction of the drive output part, of the bar slot, is arranged closer in the circumferential direction to an axial extension of a substantially radial boundary wall section, which runs behind in the rotational direction of the drive output part, of the rotational angle limiting slot, than to an axial extension of a substantially radial boundary wall section, which runs ahead in the rotational direction of the drive output part, of the rotational angle limiting slot.

6. The combined locking and rotational angle limiting device of claim 5, wherein the substantially radial boundary wall section, which runs behind in the rotational direction of the drive output part, of the bar slot, is arranged in axial alignment with the substantially radial boundary wall section, which runs behind in the rotational direction of the drive output part, of the rotational angle limiting slot.

7. The combined locking and rotational angle limiting device of claim 4, wherein a substantially radial boundary wall section, which runs ahead in a rotational direction of the drive output part, of the bar slot, is arranged closer in the circumferential direction to an axial extension of a substantially radial boundary wall section, which runs ahead in the rotational direction of the drive output part, of the rotational angle limiting slot, than to an axial extension of a substantially radial boundary wall section, which runs behind in the rotational direction of the drive output part, of the rotational angle limiting slot.

8. The combined locking and rotational angle limiting device of claim 7, wherein the substantially radial boundary wall section, which runs ahead in the rotational direction of the drive output part, of the bar slot, is arranged in axial alignment with the substantially radial boundary wall section, which runs ahead in the rotational direction of the drive output part, of the rotational angle limiting slot.

9. The combined locking and rotational angle limiting device of claim 3, wherein the bar slot is arranged substantially centrally between axial extension of a substantially radial boundary wall section, which runs behind in the rotational direction of the drive output part, and a substantially radial boundary wall section, which runs ahead in the rotational direction of the drive output part, of the rotational angle limiting slot.

10. The combined locking and rotational angle limiting device of claim 1, wherein the bar slot and the rotational angle limiting slot are formed in the drive input part.

11. The combined locking and rotational angle limiting device of claim 10, wherein the bar slot and the rotational angle limiting slot are formed in a sealing element, arranged between a housing component and the drive output part.

12. The combined locking and rotational angle limiting device of claim 11, wherein the bar slot and the rotational angle limiting slot are formed, in each case, as a radial recess of a central bore of the sealing element.

13. The combined locking and rotational angle limiting device of claim 12, wherein the bar is guided by the rotational angle limiting slot with an interposition of a sliding member engaging into the rotational angle limiting slot, with the bar being held in the sliding member so as to be movable in its movement direction.

14. The combined locking and rotational angle limiting device of claim 13, wherein the sliding member is a sleeve.

15. A camshaft adjuster having a combined locking and rotational angle limiting device as claimed in claim 1.

16. An internal combustion engine having a combined locking and rotational angle limiting device as claimed in claim 1.

17. A motor vehicle having an internal combustion engine of claim 16.