DE202017006770U1 - Hydraulic support element for a drag lever in a valve train of an internal combustion engine - Google Patents

Abstract

Hydraulic support element for a rocker arm in a valve train of an internal combustion engine, comprising a housing (1) and an axially movable in this inner element (3) for pivotally supporting the rocker arm, characterized in that at least one filter element (14, 15) for separating in Contained hydraulic fluid in at least one pressurizable with hydraulic fluid pressure chamber (7, 10) in the interior of the inner member (3) is arranged, fixed and sealed.

Description

Field of the invention

The invention relates to a hydraulic support element for a finger lever in a valve train of an internal combustion engine according to the closer defined in the preamble of claim 1. Art.

Out FR 2 910 529 is a hydraulic support element with a movable in a cylindrical wall of a housing guided upper part and formed in the cylindrical wall oil inlet opening. At the level of the oil inlet opening, an oil-ring filter is disposed radially between this and a diameter-reduced portion of the upper part for cleaning. The arrangement between the housing and the upper part moved to this and the radial flow through the oil ring filter require a complex support or guide thereof on the housing or on the moving upper part of the support element. This requires an additional design effort, a complex production with particular additional fasteners and a complex assembly. In addition, by the thereby required radial clearance on the outer and inner diameter of the oil ring filter relative to the housing or against the retracted portion of the upper part contaminated oil unfiltered get into the interior of the support element and contaminate this and connected hydraulic components of the valve train.

Summary of the invention

The invention is therefore based on the object to avoid the disadvantages described in a hydraulic support element of the aforementioned type.

The object is solved by the features of patent claim 1. Further advantageous embodiments will become apparent from the respective dependent claims, the description and the drawings.

It is proposed a hydraulic support element for a finger follower in a valve train of an internal combustion engine having a housing and an axially movable in this guided inner member to which the finger lever is pivotally supported. It is provided to arrange at least one filter element in at least one pressurizable pressure chamber with hydraulic fluid in the interior of the inner element for separating contaminants entrained in the hydraulic medium. In this way, at least one filter element in the interior of the inner element can be arranged to move along with it and be fastened in a simple manner and at the same time statically sealed, thereby avoiding expensive fastening means and leakage of unfiltered hydraulic fluid.

In a particularly advantageous manner, in this case the filter element can be arranged coaxially with the direction of movement of the inner element with an axial filter flow. This allows a particularly simple attachment in the interior of the inner element laterally to the axial filter flow.

The filter element can be pressed axially in a particularly simple manner for attachment and sealing in the pressure chamber.

It is also particularly advantageous if the filter element for attachment has an annular insert, which preferably forms a radial attachment surface for radial attachment, which preferably also serves as a sealing surface. On the insert while the filter element can be easily secured inside the inner member and at the same time sealed statically.

Preferably, the filter element is radially attached to the outer diameter of the insert on the inner wall of the pressure chamber and preferably at the same time sealed.

In a further preferred embodiment of the invention, the filter element consists of an insert for attachment in the interior of the inner member and a filter medium attached to this, which can be flowed through by hydraulic means for separating the contaminant. Preferably, an edge of the filter medium is covered by the insert for attachment.

In this case, the filter medium preferably forms a porous material permeable to hydraulic medium, preferably a sieve filter, in particular of metal.

The filter elements are particularly easy to adapt to the installation conditions by the design of the insert and the filter medium in this way.

In a preferred embodiment, the filter medium forms a basket-shaped curved separating or filtering surface for separating contaminants.

Alternatively, the filter medium has a particularly space-saving flat or planar separation surface.

The insert is preferably particularly easily made of sheet metal and includes the attachment of the edge of the filter medium positive and / or non-positive. In this case, the filter medium can be beaded on the edge, for example, with the insert. Another possibility for fastening is to insert the filter medium with the edge into an at least section-wise depression of the insert, in particular into an annular groove, preferably with a snap connection.

Alternatively, the insert may be made of plastic, rubber or elastomer. In a particularly advantageous manner while the edge of the filter medium for fixing the same at the same time as a seal with the plastic, the rubber or the elastomer encapsulated. In this way, the insert also forms a plastic or rubber seal or elastomeric seal on the filter element.

In a particularly preferred embodiment of the invention, a filter element is arranged in a first pressure chamber in the interior of a support head on a support-side end of the inner element for pivotally supporting the drag lever. In this case, the said filter element preferably lies directly opposite an outlet opening for the hydraulic medium supply of the finger lever. In this way, it is ensured that the hydraulic fluid flow led to the hydraulic medium supply of the finger lever at the outlet opening is previously passed over the filter element for filtering and contamination of the finger lever supported on the hydraulic support element is reliably avoided.

In the hydraulic support element, a hydraulic valve clearance compensation device is integrated in a particularly advantageous manner. This serves to compensate for an occurring during operation of the internal combustion engine valve clearance of a operated by the drag lever gas exchange valve of the internal combustion engine.

In a further particularly preferred embodiment of the invention, a filter element is arranged in one of the hydraulic medium supply of the hydraulic support element serving pressure chamber in the interior of the inner member. In this case, the said filter element preferably lies directly opposite a passage opening which connects the pressure space to a high-pressure space of the valve clearance compensation device. In this way, it is ensured that the hydraulic fluid flow led to the hydraulic fluid supply of the valve lash adjuster at the passage opening is previously passed over the filter element for filtering and contamination of the valve lash compensation device is reliably avoided.

The said pressure chamber is preferably designed as a hydraulic fluid reservoir of the valve play compensation device, which is connected to the passage opening arranged through the flow control check valve with the high-pressure chamber. This is arranged in a blind hole in the housing and limited by the inner member. The inner member forms in this way a movably guided in the housing pressure piston.

The inner element can be particularly advantageously designed to simplify production and assembly in two parts, in particular consisting of a Kolbenober- and lower part.

As a pressure chamber every actable with hydraulic fluid inside the interior of the inner element into consideration.

The invention can also be used with particular advantage in other valve train components, in particular in a hydraulic ram.

list of figures

• 1 eine Schnittdarstellung eines erfindungsgemäßen hydraulischen Abstützelements in einem ersten Ausführungsbeispiel,
• 1A eine perspektivische Darstellung des hydraulischen Abstützelements aus 1,
• 2 eine perspektivische Einzelansicht eines Filterelements des hydraulischen Abstützelements,
• 3 bis 6 mehrere perspektivische Einzelansichten des Filterelements in verschiedenen Ausführungsformen,
• 7 eine Schnittdarstellung eines erfindungsgemäßen hydraulischen Abstützelements in einem zweiten Ausführungsbeispiel,
• 7A eine perspektivische Darstellung des hydraulischen Abstützelements aus 7,
• 8 eine perspektivische Einzelansicht eines Filterelements des hydraulischen Abstützelements aus 7,
• 9 eine Draufsicht einer Ausführungsform des Filterelements aus 8.

Further features of the invention will become apparent from the following description and from the drawings, in which several embodiments of the invention are shown in simplified form. Show it:

• 1 a sectional view of a hydraulic support element according to the invention in a first embodiment,
• 1A a perspective view of the hydraulic support element 1 .
• 2 an individual perspective view of a filter element of the hydraulic support element,
• 3 to 6 several perspective individual views of the filter element in various embodiments,
• 7 a sectional view of a hydraulic support element according to the invention in a second embodiment,
• 7A a perspective view of the hydraulic support element 7 .
• 8th an individual perspective view of a filter element of the hydraulic support element 7 .
• 9 a plan view of an embodiment of the filter element 8th ,

Detailed description of the drawings

That's it 1 and 1a illustrated inventive hydraulic support element for a drag lever in a valve train of an internal combustion engine has a hollow cylindrical housing 1 on, which is several times slightly offset at the outer diameter and with a central axial blind hole 2 open at one end is. In this is a on the outer and inner diameter multiply stepped hollow cylindrical inner element 3 axially movable on the inner diameter of the blind hole 2 guided. At the open end of the blind hole 2 protrudes the interior element 3 out of the case 1 with a support head 4 out, which serves as a support for the pivotable support of a cam lever, not shown. The interior element 3 is between an illustrated with the support head 4 out of the case 1 maximum retracted upper stop position and a lower stop position in the housing 1 axially movable. The latter is at the inner end portion of the blind hole 2 formed here by a diameter feed with an annular shoulder as an axial stop.

In the support head 4 of the piston 3 is a first pressure room 7 formed by the housing 1 and interior element 3 corresponding to each other arranged first radial inlet openings 5 . 6 can be acted upon with hydraulic fluid. Am from the support head 4 facing away in the blind hole 2 of the housing 1 guided inner end portion of the inner element 3 is a second pressure room 10 formed by the housing 1 and pistons 3 correspondingly arranged second radial inlet openings 8th . 9 can be acted upon with hydraulic fluid. The first pressure room 7 serves with an axial outlet opening 11 at the apex of the Abstützkopfs 4 as an inlet to the hydraulic medium supply of the attached to this rocker arm. The second pressure chamber 10 serves as a hydraulic fluid reservoir for an integrated in the support element hydraulic valve lash adjuster 13 and is via an axial passage opening 12 with a high pressure room 26 connected to the same. The valve clearance compensation device 13 compensates for the valve clearance occurring during operation of the internal combustion engine on a gas exchange valve of the internal combustion engine actuated by the drag lever automatically.

For separating and collecting carried in the hydraulic fluid contaminant is in the first and in the second pressure chamber 7 . 10 one filter element each 14 . 15 intended. The contaminant consists of particles, in particular metal chips, from the abrasion in the engine of the internal combustion engine, or from other impurities. A first filter element 14 is in the first pressure room 7 in the area of the outlet opening 10 and a second filter element 15 in the second pressure chamber 10 in the area of the passage opening 12 each of the outlet opening 10 or the passage opening 12 arranged directly axially opposite one another. The filter elements 14 . 15 are coaxial with the axis of movement 27 of the interior element 3 or the central axis of the hydraulic support element and the outlet or passage opening designed as a through-bore 11 . 12 arranged. They each consist of one insert 16 . 17 and a filter medium attached thereto 18 . 19 , which in each case forms a permeable or porous separating or filter surface for hydraulic fluid, against which the contaminate is retained when the hydraulic fluid flows through. The filter media 18 . 19 are each formed here by a basket-shaped curved sieve. The filter elements 14 . 15 each form a sieve filter in this way.

The filter elements 14 . 15 are lateral to the axial filter flow with the respective use 16 . 17 on the inner wall of the inner element 3 attached. They are with the outer diameter of the respective annular insert 16 . 17 in the respective pressure chamber 7 . 8th inside the interior element 3 introduced axially, in particular pressed and at the same time with the outer diameter of the insert 16 . 17 annular at the inner diameter of the respective pressure chamber 7 . 10 on the inner wall of the inner element 3 applied radially sealed. The of the inserts 16 . 17 each held filter media 18 . 19 be doing of hydraulic fluid on its way to the outlet or passage opening 11 . 12 flows through substantially axially with a lateral inflow through the basket-shaped filter media 18 . 19 is possible. In this way are the filter elements 14 . 15 each with substantially axial filter flow in the respective pressure chamber 7 . 10 completely inside the interior element 3 arranged. As a result, they are in a valve clearance compensation movement of the inner element 3 in the interior of the same with this moved and are arranged relative to this static, whereby the filter elements 14, 15 on the inner wall of the inner element 3 can be statically sealed. In this case, the entrained in the hydraulic fluid contaminant to the basket-shaped filter or separation surfaces of the filter media 18 . 19 the filter elements 14 . 15 retained and collected, causing contamination of the support head 4 superimposed rocker arm or at the passage opening 11 . 12 connected high-pressure chamber 26 the valve clearance compensation device 13 is avoided.

The filter media 18 . 19 form each one of their missions 16 . 17 opposite axial ends a flattened bottom, with which the first filter element 14 slightly axially spaced from the outlet opening 11 is arranged and the second filter element 15 on the inner wall of the second pressure chamber 8th in the area of the passage opening 12 axially abutting.

2 shows the basic structure of a filter element according to the invention 14 . 15 with an insert 16 . 17 , which is the basket-shaped filter as a filter medium 18 . 19 includes at its edge annular for attachment. The use 16 . 17 and the filter medium 18 . 19 With their design, they can be easily adapted to the installation conditions and with the mesh size of the sieve at the contamination level. or degree of contamination of the hydraulic fluid to be adjusted. The use 16 . 17 forms on the outer diameter of an annular sealing surface and serves in this way at the same time as a seal on the filter elements 14 . 15 ,

According to a first embodiment according to 3 is the use 16 . 17 designed as a metal ring to which a basket-shaped metal mesh preferably positive and / or non-positive, in particular by forming, for example by crimping, is added. Further in 4 to 6 illustrated embodiments have as an insert 16 , 17 a plastic ring ( 4 ) or a rubber ring or elastomer ( 5 and 6 ), which in each case to the edge of the designed as a metal mesh filter medium 14 . 15 for attaching the same is molded. The use 16 . 17 forms at the outer diameter of a plastic ( 4 ) or a rubber or elastomeric seal ( 5 and 6 ). 3 to 6 moreover, show further embodiments of the filter media 18 . 19 namely, an embodiment with a flattened bottom according to 3 and 4 , another embodiment with a slightly curved floor after 5 and an embodiment with a tapered bottom which is flattened at the end according to 6 ,

In 7 to 9 a second embodiment of a hydraulic support element according to the invention is shown, in which in the first and second pressure chamber 7, 10 each one according to 8th and 9 particularly space-saving modified filter element 20 . 21 is arranged. These embodiments each have a circular disk-shaped metal plate as a filter medium 22 . 23 on. The metal mesh is in each case with its outer diameter at the inner diameter of an annular insert 24 . 25 attached, which comprises a flat filter or separating surface at the inner diameter. The use 24 . 25 may be formed, for example, as a metal ring, on which the filter medium 22 . 23 positive and / or non-positive, for example, in an annular mounting groove in particular by a snap connection on the inner diameter of the insert 24 . 25 is attached. It is also conceivable, the use 24 , 25 as described above as a plastic or rubber or elastomeric ring perform, which also serves for sealing.

The hydraulic support element ( 1 . 1a and 7 . 7a ) is with the housing 1 in a bore, for example, a cylinder head, not shown, of the internal combustion engine plugged. The inlet openings 5 . 6 . 8th . 9 on the housing 1 or on the piston 3 are each designed as radial through holes and communicate with not shown corresponding hydraulic fluid connections on the cylinder head. As the hydraulic fluid engine oil can be used from the engine oil circuit of the internal combustion engine. The inlet openings 5 . 6 on the housing 1 and on the piston 3 can be acted upon from a so-called Schaltölgalerie with hydraulic fluid for lubricating and switching oil supply a switchable drag lever, while the inlet openings 8th . 9 on the housing 1 and on the interior element 3 in hydraulic fluid connection with a separate oil gallery to supply the valve lash adjuster 13 stand.

The high pressure room 26 the valve clearance compensation device 13 is at the closed inner end of the blind hole 2 is formed, and on the one hand by the inner wall of this and on the other hand axially through the inner end face of the inner element 3 limited. The interior element 3 forms in this way at its inner end one in the blind hole 2 movably arranged pressure piston with an axial end-side piston surface, the high-pressure chamber 26 limited. The valve clearance compensation device 13 It also consists of a ball check valve that controls the flow at the port 12 of the inner element 3 controls automatically. About one in the high pressure room 26 arranged return spring is the inner element 3 with its inner end face at the inner end of the blind hole 2 axially supported.

The interior element 3 is made in two parts consisting of a Kolbenober- and lower part. The piston upper part comprises the support head 4 with the first pressure chamber formed in the interior 7 , while the lower piston part inside the second pressure chamber 10 forms and with its front end the high-pressure chamber 26 in the blind hole 2 axially limited. In the piston upper part, a separating sleeve is arranged in a transition region between the first and second pressure chamber and facing the first pressure chamber with an end face closed axial end, which a vent for venting the second pressure chamber and the valve lash adjuster 13 serves.

LIST OF REFERENCE NUMBERS

1

casing

2

Blind hole

3

piston

4

Abstützkopf

5

inlet opening

6

inlet opening

7

pressure chamber

8th

inlet opening

9

inlet opening

10

pressure chamber

11

outlet

12

Port

13

Lash adjuster

14

filter element

15

filter element

16

commitment

17

commitment

18

filter media

19

filter media

20

filter element

21

filter element

22

filter media

23

filter media

24

commitment

25

commitment

26

High-pressure chamber

27

motion axis

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

• FR 2910529 [0002]

Claims (10)

Hydraulic support element for a rocker arm in a valve train of an internal combustion engine, comprising a housing (1) and an axially movable in this inner element (3) for pivotally supporting the rocker arm, characterized in that at least one filter element (14, 15) for separating in Contained hydraulic fluid in at least one pressurizable with hydraulic fluid pressure chamber (7, 10) in the interior of the inner member (3) is arranged, fixed and sealed. Hydraulic support after Claim 1 Characterized in that the filter element (14, 15) for fixing and sealing in the pressure chamber (7, 10) is pressed axially. Hydraulic support element according to one of Claims 1 or 2 , characterized in that the filter element (14, 15) for attachment in the pressure chamber (7, 10) has an annular insert (16, 17) and with the outer diameter of the insert (16, 17) as a seal on the inner wall of the pressure chamber (7 , 10) bears radially. Hydraulic support element according to one of Claims 1 to 3 , characterized in that the filter element (14, 15) has an insert (16, 17) for attachment in the pressure chamber (7, 10) and attached to this filter medium (18, 19), which can be flowed through by hydraulic means for separating the contaminant wherein the filter medium (18, 19) is included at an edge for attachment to the insert. Hydraulic support after Claim 4 , characterized in that the filter medium (18, 19) forms a basket-shaped curved separating surface for the deposition of contaminants. Hydraulic support after Claim 4 , characterized in that the filter medium (18, 19) forms a flat separation surface for the deposition of contaminants. Hydraulic support element according to one of Claims 3 to 6 , characterized in that the insert (16, 17) made of sheet metal and for fixing a filter medium (18, 19) comprises a closed circumferential edge of the same form and / or non-positively. Hydraulic support element according to one of Claims 3 to 6 , characterized in that the insert (16, 17) made of plastic, rubber or elastomer and for attaching a filter medium (18, 19) a closed circumferential edge of the same with the plastic, rubber or elastomer is molded as a seal. Hydraulic support element according to one of Claims 1 to 8th , characterized in that a filter element (14) in a pressure chamber (7) in a support head (4) at a support end of the inner member (3) is arranged, which serves for the pivotable support of the finger lever, wherein the filter element (14) an outlet opening (11) on the support head (4) directly opposite to the hydraulic medium supply of the finger lever. Hydraulic support element according to one of Claims 1 to 9 Characterized in that a filter element (15) is disposed in a hydraulic medium storage space forming the pressure chamber (10) in the inner element (3) which serves for hydraulic medium supply an integrated hydraulic valve lash adjuster (13), and the filter element (15) of one (with a high-pressure chamber 26) of the valve clearance compensation device (13) connected directly to the passage opening (12).

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