Control valve having an outflow channel

Patent metadata

Field	Value
Publication number	US-10247060-B2
Application number	US-201615540624-A
Country	US
Kind code	B2
Filing date	Jan 14, 2016
Priority date	Jan 15, 2015
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A control valve (1) for a camshaft adjustment device, and to an internal combustion engine having a camshaft adjustment device and a control valve (1) is provided. The control valve (1) includes a valve housing (3) and a pressure medium guiding insert (23) arranged coaxially in a recess of the valve housing (3). A discharge passage (27, 28) of the pressure medium guiding insert (23) transitions into a discharge duct (22) running in the axial direction, wherein the discharge connection T can be connected to the control connections A, B and wherein the discharge connection T is arranged in a region between the second end (8), which is opposite the first end (6), and the control connections A, B.

First claim

What is claimed is:

1. A control valve for a camshaft adjustment device, comprising:
a valve housing including an inflow connection P, two control connections A and B, and an outflow connection T;
a pressure medium-conducting insert, coaxially situated in a receptacle of the valve housing, the pressure medium-conducting insert having an inflow passage, an outflow passage, and two control passages; and
a control piston coaxially guided in the pressure medium-conducting insert and having an inflow groove, an outflow groove, and a control groove on an outer circumference, the control piston including a piston head forming an actuating surface on a front side and defining a first end of the control valve on an actuation side,
the outflow passage merging into an outflow channel extending in an axial direction, at least one of the two control connections A, B connectable with the outflow connection T via the outflow channel, and the outflow connection T being situated in an area between a second end of the control valve, opposite from the first end, and the two control connections A, B.

2. The control valve as recited in claim 1 wherein the outflow channel is at least partially enclosed by the pressure medium-conducting insert, external dimensions of the pressure medium-conducting insert being adapted to internal dimensions of the receptacle of the valve housing, and the outflow channel being formed at an interface between the valve housing and the pressure medium-conducting insert.

3. The control valve as recited in claim 2 wherein the pressure medium-conducting insert includes a radially interior sleeve-shaped component and an outer sleeve-shaped component, the outer sleeve-shaped component being manufactured as an injection-molded part and the inner sleeve-shaped component being designed as an insert component extrusion-coated by the outer sleeve-shaped component during an injection molding process for the outer sleeve-shaped component.

4. The control valve as recited in claim 2 wherein the pressure medium-conducting insert is manufactured in one piece from plastic or steel.

5. The control valve as recited in claim 1 wherein the inflow connection P is fluidically connectable with the control groove and the two control connections A, B via the inflow passage, the inflow groove, and a piston cavity.

6. The control valve as recited in claim 5 wherein the inflow connection P is situated in an area of the second end of the control valve, the control connection A and the control connection B adjoining axially in a direction of the first end, and the outflow connection T being situated in a direction of the second end.

7. The control valve as recited in claim 6 wherein the control piston has a circumferential inflow groove in the area of the second end, the control piston having a circumferential outflow groove A, a control groove, and an outflow groove B adjoining axially in the direction of the first end.

8. The control valve as recited in claim 7 wherein the outflow connection T is situated in the area of the second end at the front side of the control valve.

9. The control valve as recited in claim 1 wherein a check valve made up of a spring strip with overlapping ends wound to form a cylindrical valve spring is situated within a piston cavity.

10. An internal combustion engine comprising:
a camshaft adjustment device; and
a control valve including a valve housing situated in a receptacle of a camshaft and which includes an outflow connection T, two control connections A and B, and an inflow connection P situated within the camshaft, and a pressure medium-conducting insert, situated in a receptacle of the valve housing, and having an inflow passage, an outflow passage, and two control passages, and a control piston guided in the pressure medium-conducting insert and on an outer circumference having an inflow groove, an outflow groove, and a control groove,
the outflow passage merging into an outflow channel extending in an axial direction, whereby the outflow connection T is connectable with the two control connections A, B, and the outflow connection T is connected, via a connection in the camshaft, to a cavity, a hydraulic medium line, or a volume accumulator.

Assignees

• Schaeffler Technologies Ag

Inventors

• Koehler David
• Hoppe Jens

Classifications

• F01L2301/00

  Using particular materials · CPC title

• F01L1/344 Primary

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

• F01L2001/3443

  Solenoid driven oil control valves · CPC title

• F16K1/36

  Valve members (for double-seat valves F16K1/44 {; for butterfly valves F16K1/222, F16K1/223}) · CPC title

• F16K31/0613

  with cylindrical slides · CPC title