DE102012110570A1 - Bushing for hydraulic piston valve of camshaft adjuster, has wall with inner side and outer side, opening arranged in wall, and filter element arranged on inner side of wall, where inner ring channel is assigned to opening - Google Patents

Abstract

The bushing (31) has a wall with an inner side and an outer side, an opening (32,33,34) arranged in the wall, and a filter element for the opening. The filter element is arranged on the inner side of the wall. An inner ring channel is assigned to the opening, and the filter element is arranged in the inner ring channel. The filter element is made of band-shaped material and has a flat ring-like shape with a C-or O-shaped cross-section.

Description

The invention relates to a bush for a hydraulic piston valve, the bush having a wall with an inside and an outside, at least one passage opening arranged in the wall and at least one filter element for the at least one passage opening, a hydraulic piston valve with such a bush and a camshaft adjuster with a hydraulic piston valve with such a socket.

From the DE 100 27 080 A1 an oil pressure control device is known for an internal combustion engine, comprising: a hydraulic pressure source; a hydraulic actuator which is operated by hydraulic pressure; a fluid passage communicating with the hydraulic pressure source and the hydraulic actuator for introducing and discharging a hydraulic pressure between the hydraulic pressure source and the actuator; a control valve disposed in the fluid passage for controlling the hydraulic pressure introduced into the actuator; and a filter disposed in fluid communication between the actuator and the control valve to provide an improved oil pressure control device for an internal combustion engine, which achieves high reliability in operation and high efficiency in assembly.

According to the DE 100 27 080 A1 For example, the filter includes a filter section and a frame that encloses the filter section. The filter has a substantially C-shape in cross section before it is mounted around a valve body. The filter is arranged on the outside of the valve body. The filter section is a mesh of fine mesh made of a metallic material, and the frame is made of a synthetic resin. Comparable arrangements are known from US Pat. No. 7,040,874 B1 and from the EP 1 921 359 A1 known.

From the DE 10 2008 006 178 A1 is a Druckmittelleiteinsatz known for a control valve in a hydraulic actuator with a tubular guide sleeve for guiding a control piston, which is arranged in a receptacle with arranged in the guide sleeve by webs separate passage openings for the pressure medium, wherein arranged on the outside of the guide sleeve, a plastic part is, which has sealing webs which are supported on the inside of the passages separating webs of the guide sleeve and sealingly against the outside of the inside of the receptacle to create a favorable in terms of material and manufacturing costs Druckmittelleiteinsatz.

According to the DE 10 2008 006 178 A1 the pressure medium insert has an integrated filter fabric. The pressure medium insert has a three-part basic structure with a guide sleeve, a connection piece and an overmolded plastic part. Between the plastic part and the guide sleeve, a tubular filter is arranged, which is arranged on the latter before encapsulation of the guide sleeve.

From the JP 2007162765 A For example, a hydraulic control valve is known which has a filter with two ends, the ends each having a slot for mutual engagement. The filter is arranged on the outside of a sleeve. Thus, an increase in a diameter of the filter is prevented when a working oil flow flows from inside to outside through a sleeve.

From the US 2008/020605 A1 is a filter for a pressure control valve of an electronically controllable steering device known comprising a support frame and a filter wall. The filter wall is fixed by means of the support frame and held on a valve body.

From the DE 10 2005 013 085 B3 a valve is known with central guide and a check valve, wherein the check valve comprises a formed into a closed ring band which is freely rotatably mounted on the inside of the central guide, wherein the closed ring is an open-band, which distributed asymmetrically on a portion of the central guide Through openings to the central guide closes at return pressure drop.

The invention has for its object to improve a sleeve initially mentioned structurally and / or functionally. In particular, the use of filter elements should be made possible even with comparatively large passages. In particular, a reliable arrangement of filter elements should be made possible. In particular, a simple attachment of filter elements should be possible. In addition, a hydraulic piston valve is provided with such a socket. In addition, a camshaft adjuster is to be provided with a hydraulic piston valve with such a socket.

The object is achieved with a bushing for a hydraulic piston valve, the socket having a wall with an inside and an outside, at least one passage opening arranged in the wall and at least one filter element for the at least one passage opening, in which the at least one filter element on the inside the wall is arranged.

The bushing may have a tubular shape. The bushing may have a hollow cylindrical shape. In the socket, a valve piston can be arranged. On the inside, a contact surface for a valve piston may be formed. The socket can be used for recording in a control block. On the outside, a contact surface may be formed for a control block. The at least one passage opening can serve for the passage of a hydraulic fluid. The at least one passage opening may extend in the radial direction of the bushing between the inside and the outside. The at least one passage opening may extend in the circumferential direction of the bushing over a predetermined portion of the circumference. The at least one passage opening may have a predetermined width in the axial direction of the bushing. The at least one passage opening may have a slot-like shape. The at least one passage opening may have a window-like shape. The at least one passage opening may have a peripheral edge. In the axial direction of the bushing, a plurality of passage openings can be arranged next to one another and spaced apart from one another. The plurality of passage openings can be arranged in the same position in the circumferential direction of the bushing. The plurality of passage openings can be arranged offset from each other in the circumferential direction of the sleeve.

The at least one filter element may be a sieve. The at least one filter element may be made of a plastic or of a metal. The at least one filter element may be made of an aluminum alloy. It can be provided for each passage opening a separate filter element. The at least one filter element can be frameless. The at least one filter element can be self-supporting. The at least one filter element can completely cover the at least one passage opening. The at least one filter element can overlap a peripheral edge of the at least one passage opening. The at least one filter element may have an inner surface and an outer surface. The at least one filter element can be arranged with its outer surface adjacent to the inside of the wall. The at least one filter element can be arranged directly adjacent to the wall.

The bushing may have at least one inner ring channel assigned to the at least one passage opening, and the at least one filter element may be arranged in the at least one inner ring channel. The at least one inner ring channel can be circumferential in the circumferential direction of the bushing. The at least one inner raceway channel may serve to form at least one control edge of the bushing. The at least one inner ring channel may have a rectangular cross-section. The at least one inner ring channel may have a step-like cross-section. The at least one inner ring channel may have a first channel section and a second channel section. The first channel portion and the second channel portion may connect to each other in the radial direction of the socket. The first channel section may be arranged on the inside of the socket. The second channel section can connect in the direction of the outside to the first channel section. The first channel section and the second channel section can be arranged symmetrically relative to one another in the axial direction of the sleeve. The first channel section may have a greater width in the axial direction of the bush than the second channel section. The first channel section may have in the radial direction of the sleeve inwardly directed radial contact surfaces. In the axial direction of the bush, the first channel section may have lateral contact surfaces.

The at least one filter element can be arranged in the first channel section of the inner ring channel. The at least one filter element can abut in the radial direction on the radial contact surfaces of the first channel section. The at least one filter element can be arranged in the axial direction between the lateral contact surfaces of the first channel section. The at least one filter element can be arranged elastically biased on the wall. The at least one filter element can be arranged to rest elastically biased on the radial contact surfaces of the first channel section.

The at least one filter element can be made of a first band-shaped material and have a flat ring-like shape with a C- or O-like cross-section. The at least one filter element can have a width in the axial direction of the bush, which corresponds at least approximately to a width of the first channel section of the inner ring channel.

The at least one filter element may have an overlapping shock. The impact may be welded from the outside through the at least one passage opening. The at least one filter element can be welded to the wall from the outside through the at least one passage opening. The at least one filter element can be welded circumferentially from the outside through the at least one passage opening at an edge of the at least one passage opening.

In addition, a solution of the problem underlying the invention with a hydraulic piston valve having such Rifle. The piston valve may have a piston arranged in the bushing. The piston can be displaceable in the bush in the axial direction between two end positions. An end position can be a preferred position. The piston valve may have a biasing spring. The biasing spring may serve to bias the piston toward the preferred position. The piston valve may include an electromagnetic actuator. The actuator may serve to urge the piston against a force of the biasing spring. The piston valve may be a cartridge valve. The piston valve may be intended for inclusion in a control block.

In addition, a solution of the problem underlying the invention with a camshaft adjuster comprising a hydraulic piston valve with such a socket. The camshaft adjuster can be used for arrangement in a valve train of an internal combustion engine, in particular of a motor vehicle internal combustion engine. The camshaft adjuster can be used for power transmission between a crankshaft and a camshaft of an internal combustion engine, in particular a motor vehicle internal combustion engine. The camshaft adjuster can serve to phase-adjust the camshaft with respect to the crankshaft. The phaser may include at least one stator and at least one rotor. The at least one stator and the at least one rotor can be rotatable in a limited manner relative to one another. The camshaft adjuster can be hydraulically adjustable. The piston valve may serve to control an adjustment of the camshaft adjuster.

With the invention, a use of filter elements is possible even with comparatively large passages. A reliable arrangement of filter elements is possible. A simple attachment of filter elements is possible. This protection of the valve is achieved against unwanted impurities and improved reliability. The valve has a low flow resistance. The valve allows a high flow.

In summary and in other words, the invention thus provides, inter alia, an elastic filter screen in the inner ring channel of a valve bushing. The filter screen may be an elastically biased screen. The filter screen can be arranged in an inner ring channel of the socket. A mounting of the sieves can be done analogous to a tape RSV assembly. It can be a positional orientation of an overlapping shock. The shock can be welded from the outside through a bush window. The sieves can be made of aluminum. A positional orientation of the joint can be dispensed with and a weld can be made along a window edge. The weld prevents the screens from collapsing inwards in the event of pressure surges from the outside. A passage area for an oil flow is increased. There can be practically a complete cylinder jacket of the screen for a flow available.

By "may" in particular optional features of the invention are referred to. Accordingly, there is an embodiment of the invention each having the respective feature or features.

Hereinafter, an embodiment of the invention will be described with reference to figures. From this description, further features and advantages. Concrete features of this embodiment may represent general features of the invention. Features associated with other features of this embodiment may also represent individual features of the invention.

They show schematically and by way of example:

1 in a sectional representation of a Schwenkmotorversteller with a hydraulic piston valve,

2 a hydraulic piston valve with a bushing formed as a window passages,

3 a hydraulic piston valve with a socket formed as a window passages and filter screens in a fragmentary sectional view and

4 a filter screen for a passage opening a socket of a hydraulic piston valve.

1 shows in a sectional view a Schwenkmotorversteller 14 with a hydraulic piston valve. With a Schwenkmotorversteller 14 During operation of an internal combustion engine, the angular position on the camshaft 18 opposite a drive wheel 2 infinitely changed. By turning the camshaft 18 The opening and closing times of the gas exchange valves are shifted so that the internal combustion engine brings its optimum performance at the respective speed. The Schwenkmotorversteller 14 has a cylindrical stator 1 on, the rotation with the drive wheel 2 connected is. In the embodiment, the drive wheel 2 a sprocket over which a chain, not shown, is guided. The drive wheel 2 but may also be a toothed belt, over which a drive belt is guided as a drive element. About this drive element and the drive wheel 2 is the stator 1 Driven with the crankshaft.

The stator 1 comprises a cylindrical stator base body 3 , on the inner side radially inwardly at equal intervals webs 4 protrude. Between neighboring bridges 4 become spaces 5 formed, in which, controlled by a centrally disposed hydraulic valve, pressure medium is introduced. Between neighboring bridges 4 protrude wings 6 radially outward from a cylindrical rotor hub 7 a rotor 8th protrude. These wings 6 divide the spaces between 5 between the bridges 4 each in two pressure chambers 9 and 10 , The one pressure chamber 9 is assigned to the adjustment in the direction of "early", whereas the other pressure chamber is associated with the adjustment in the "late" direction.

The bridges 4 lie with their end faces sealingly on the outer circumferential surface of the rotor hub 7 at. The wings 6 in turn lie with their end faces sealingly on the cylindrical inner wall of the stator main body 3 at.

The rotor 8th is non-rotatable with the camshaft 18 connected. To the angular position between the camshaft 18 and the drive wheel 2 to change, the rotor becomes 8th relative to the stator 1 turned. For this purpose, depending on the desired direction of rotation, the pressure medium in the pressure chambers 9 or 10 pressurized while each other's pressure chambers 10 or 9 relieved to a tank. To the rotor 8th opposite the stator 1 to pivot counterclockwise in the illustrated position, the hydraulic valve is an annular first annular rotor channel in the rotor hub 7 put under pressure. From this first rotor channel then lead more channels 11 into the pressure chambers 10 , This first rotor channel is assigned to a first work connection. To the rotor 8th however, to pivot clockwise, the hydraulic valve is a second annular rotor channel in the rotor hub 7 pressurized in the channels 13 lead. This second rotor channel is assigned to a second working port B. These two rotor channels are relative to a central axis 22 axially spaced from each other so that they in the plane of 1 lie hidden behind each other.

The Schwenkmotorverstellers 14 is on as a hollow tube 16 executed built camshaft 18 placed. This is the rotor 8th on the camshaft 18 plugged. The hollow tube 16 has holes which connect the two working ports associated rotor channels hydraulically with transverse bores in a socket of the hydraulic valve. Thus, the Schwenkmotorversteller 14 pivotable by means of the hydraulic valve.

2 shows a hydraulic piston valve 30 with a socket 31 with trained as a window passages 32 . 33 . 34 . 3 shows the piston valve 30 with filter screens 35 . 36 . 37 in a sectioned sectional view. The piston valve 30 is intended to be arranged in a control block. The piston valve 30 serves to control a Schwenkmotorverstellers, such as Schwenkmotorversteller 14 according to 1 ,

The socket 31 has a cylindrical shape. The socket 31 has a wall 38 with an inside 39 and an outside 40 on. On the inside 39 has the socket 31 radially encircling inner ring channels 41 . 42 . 43 on. The inner ring channels 41 . 42 . 43 are in the axial direction of the socket 31 juxtaposed and spaced apart. The passages 32 . 33 . 34 extend in the radial direction of the socket 31 each between the outside 40 and an inner raceway channel 41 . 42 . 43 , In the circumferential direction of the socket 31 are the passages 32 . 34 arranged in the same position. The passage opening 33 is to the passages 32 . 34 in the circumferential direction of the socket 31 staggered. The passage opening 34 forms a working port A of the piston valve 30 , The passage opening 33 forms a pressure port P of the piston valve 30 , The passage opening 32 forms a working port B of the piston valve 30 , The inner ring channels 41 . 42 . 43 each form on the inside of the wall 38 Control edges of the socket 31 , The following is an example of the inner ring channel 42 with passage opening 33 and filter screen 36 described in more detail.

The inner ring channel 42 has a first channel section 44 and a second channel section 45 on. The first channel section 44 is on the inside 39 the Wall 38 arranged. The second channel section 45 is at the first channel section 44 then arranged radially on the outside. This indicates the wall 38 in the area of the inner ring channel 42 a reduced thickness. The passage opening 33 opens into the second channel section 45 , The passage opening 33 points in the circumferential direction of the socket 31 one opposite to their width in the axial direction of the socket 31 multiple length. The first channel section 44 has a greater width than the second channel section 45 , In the axial direction, the first channel section 44 and the second channel section 45 arranged symmetrically to each other. The first channel section 44 has radially inwardly directed radial contact surfaces 46 . 47 on. In the axial direction, the first channel section 44 lateral contact surfaces 48 . 49 on.

In the first channel section 44 is the filter screen 36 arranged. 4 shows the filter screen 36 in detail view. The filter screen 36 is made of a metal material. The filter screen 36 is out an initially flat band-shaped output part made and formed flat-ring-like. The ends 56 . 57 the ribbon-shaped output part are arranged overlapping. The filter screen 36 points in the axial direction of the socket 31 a width equal to a width of the first channel section 44 equivalent. The filter screen 36 is between the lateral contact surfaces 48 . 49 of the first channel section 44 arranged. The filter screen 36 lies in the radial direction of the socket 31 at the radial contact surfaces 46 . 47 of the first channel section 44 elastically toughened on. The filter screen 36 covers the passage opening 33 Completely. The overlap area 58 the ends 56 . 57 of the filter screen 36 can in the area of the passage opening 33 be arranged. The ends of the filter screen 36 can be welded together from the outside. The filter screen 36 can circumferentially from the outside at an edge of the passage opening 33 be welded.

Regarding the inner ring channels 41 . 43 with passages 32 . 34 and filter screens 35 . 37 goes to the description of the inner ring channel 42 with passage opening 33 and filter screen 36 directed.

The piston valve 30 has a piston 50 on. The piston 50 is designed as a hollow piston. The piston 50 is in the socket 31 arranged. The piston 50 has sections with different outside diameters. This control edges are formed, which cooperate with the control edges of the socket. The piston 50 is displaceable in the axial direction between two end positions. A biasing spring 51 serves to act on the piston 50 in the direction of a preferred situation. The piston valve 30 has an electromagnetic actuator 52 on. The actuator 52 serves to act on the piston 50 against a force of the biasing spring 51 , The piston valve 30 has a plug connection 53 for contacting the actuator 52 on. The piston valve 30 has a fastening eye 54 for fastening the piston valve 30 on. At the socket 31 is a sealing ring 55 arranged.

LIST OF REFERENCE NUMBERS

1

Sator

2

drive wheel

3

stator base

4

web

5

gap

6

wing

7

rotor hub

8th

rotor

9

pressure chamber

10

pressure chamber

11

channel

13

channel

14

Schwenkmotorversteller

16

hollow tube

18

camshaft

22

central axis

30

piston valve

31

Rifle

32

Through opening

33

Through opening

34

Through opening

35

filter screen

36

filter screen

37

filter screen

38

wall

39

inside

40

outside

41

Inner ring channel

42

Inner ring channel

43

Inner ring channel

44

first channel section

45

second channel section

46

radial contact surface

47

radial contact surface

48

lateral contact surface

49

lateral contact surface

50

piston

51

biasing spring

52

actuator

53

plug-in connection

54

securing eye

55

seal

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10027080 A1 [0002, 0003]
• US7040874 B1 [0003]
• EP 1921359 A1 [0003]
• DE 102008006178 A1 [0004, 0005]
• JP 2007162765 A [0006]
• US 2008/020605 A1 [0007]
• DE 102005013085 B3 [0008]

Claims (10)

Rifle ( 31 ) for a hydraulic piston valve ( 30 ), the socket ( 31 ) having a wall ( 38 ) with an inside ( 39 ) and an outside ( 40 ), at least one in the wall ( 38 ) arranged passage opening ( 32 . 33 . 34 ) and at least one filter element ( 35 . 36 . 37 ) for the at least one passage opening ( 32 . 33 . 34 ), characterized in that the at least one filter element ( 35 . 36 . 37 ) inside on the wall ( 38 ) is arranged. Rifle ( 31 ) according to claim 1, characterized in that the bushing ( 31 ) at least one of the at least one passage opening ( 32 . 33 . 34 ) associated inner ring channel ( 41 . 42 . 43 ) and the at least one filter element ( 35 . 36 . 37 ) in the at least one inner ring channel ( 41 . 42 . 43 ) is arranged. Rifle ( 31 ) according to at least one of the preceding claims, characterized in that the at least one filter element ( 35 . 36 . 37 ) elastically prestressed on the wall ( 38 ) is arranged. Rifle ( 31 ) according to at least one of the preceding claims, characterized in that the at least one filter element ( 35 . 36 . 37 ) is made of a first band-shaped material and has a flat ring-like shape with a C- or O-like cross-section. Rifle ( 31 ) according to at least one of the preceding claims, characterized in that the at least one filter element ( 35 . 36 . 37 ) an overlapping shock ( 58 ) having. Rifle ( 31 ) according to claim 5, characterized in that the impact ( 58 ) from the outside ( 40 ) ago by the at least one passage opening ( 32 . 33 . 34 ) is welded through. Rifle ( 31 ) according to at least one of the preceding claims, characterized in that the at least one filter element ( 35 . 36 . 37 ) from the outside ( 40 ) ago by the at least one passage opening ( 32 . 33 . 34 ) through the wall ( 38 ) is welded. Rifle ( 31 ) according to at least one of the preceding claims, characterized in that the at least one passage opening ( 32 . 33 . 34 ) has a slot-like shape. Hydraulic piston valve ( 30 ) comprising a socket ( 31 ) according to at least one of the preceding claims. Camshaft adjuster ( 14 ) comprising a hydraulic piston valve ( 30 ) with a socket ( 31 ) according to at least one of claims 1-8.

Images