Camshaft adjuster including a discharge valve

Patent metadata

Field	Value
Publication number	US-10024204-B2
Application number	US-201515302102-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Apr 7, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A hydraulic camshaft adjuster ( 1 ), in particular a vane-type hydraulic camshaft adjuster, including a rotor ( 2 ) and a stator ( 3 ) which are mounted to rotate with respect to each other, a cover ( 10 ) fixed on the stator ( 3 ), including a locking receiver and at least one locking pin ( 11, 12 ) accommodated in the rotor ( 2 ), the locking pin being slidable in the axial direction and prestressed in the direction of the locking receiver, and a hydraulic channel ( 27, 28, 29 ) to apply pressure of the locking pin ( 11, 12 ) against the prestress of same, the hydraulic channel being able to be filled and emptied with a hydraulic medium via a central screw, wherein in the rotor ( 2 ) at least one additional discharge channel ( 37, 38, 39, 40 ) fluidically connected to the hydraulic channel ( 27, 28, 29 ) is formed with a discharge valve ( 33, 34, 35, 36 ), wherein preferably the discharge valve ( 33, 34, 35, 36 ) closes the discharge channel ( 37, 38, 39, 40 ) when the locking pin ( 11, 12 ) is pressurized and opens the discharge channel when the hydraulic pressure acting on the locking pin ( 11, 12 ) falls.

First claim

The invention claimed is:

1. A hydraulic camshaft adjuster comprising:
a rotor and a stator supported rotatably relative to one another;
a cover fixed to the stator and including a locking receptacle;
at least one locking pin accommodated in the rotor in such a way that the at least one locking pin is displaceable in the axial direction, and is pretensioned with pretension in a direction of the locking receptacle;
a hydraulic channel for acting with pressure on the at least one locking pin against the pretension, and fillable with a hydraulic medium emptiable via a central screw; and
at least one additional discharge channel fluidically connected to the hydraulic channel and including a discharge valve formed in the rotor,
wherein the discharge valve includes a valve seat fixed in the rotor, and a valve body movable with respect to the valve seat including a flow path,
wherein the discharge valve includes a cartridge fixed in the at least one additional discharge channel and forms the valve seat.

2. The hydraulic camshaft adjuster as recited in claim 1 wherein the discharge valve is integrated in such a way that the discharge valve closes the at least one additional discharge channel when the at least one locking pin is acted on by hydraulic pressure, and opens the at least one additional discharge channel when the hydraulic pressure acting on the at least one locking pin drops, or the discharge valve is a shut-off valve and is situated in the at least one additional discharge channel in the rotor.

3. The hydraulic camshaft adjuster as recited in claim 1 wherein the hydraulic channel is formed in the rotor or in the cover, and forms a flow path for hydraulic medium through the rotor from a supply line to the at least one locking pin, and from the at least one locking pin to the discharge valve and to the at least one additional discharge channel.

4. The hydraulic camshaft adjuster as recited in claim 1 wherein the hydraulic channel is a ring channel leading from a supply line via the at least one locking pin back to the supply line.

5. The hydraulic camshaft adjuster as recited in claim 1 wherein the valve body includes a diaphragm whose axial width is less than an axial length of the valve body, or whose flow cross-sectional area is less than a flow cross-sectional area of the flow path.

6. The hydraulic camshaft adjuster as recited in claim 1 wherein the valve body is pretensioned into an open position, the at least one additional discharge channel being open in the open position, via a compression spring.

7. The hydraulic camshaft adjuster as recited in claim 1 wherein the valve body is provided with a through hole.

8. The hydraulic camshaft adjuster as recited in claim 1 wherein the discharge valve is a shut-off valve and the cartridge has at least one recess forming a flow path for hydraulic medium through the at least one additional discharge channel when the shut-off valve is open.

Assignees

• Schaeffler Technologies Ag

Inventors

• Thielen Jochen
• Boese Olaf
• Zschieschang Torsten

Classifications

• F01L2001/34453

  Locking means between driving and driven members · CPC title

• F01L2001/34469

  Lock movement parallel to camshaft axis · CPC title

• F01L1/3442 Primary

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title

• F01L2001/34433

  Location oil control valves · CPC title

• F01L2001/34466

  with multiple locking devices · CPC title