DE102013207404A1 - Switchable support element - Google Patents

Abstract

Proposed is a switchable support element (1) for a valve train of an internal combustion engine, with a housing (4), in the bore (5) of which an axially movable inner element (7) is seated, at least one in a radial bore (8) of the inner element (7) Coupling slide (9), which can be brought into engagement with a driving surface of the housing (4) in an axially extended position, the extended position being limited by a height stop means (10), an outer casing (11) of the housing (4) from A projection (12) for the representation of an external anti-rotation device is protruded, at least one snap ring being applied as the height stop means (10) which rotates on a ring shoulder (13) on the housing side of the inner element (7) and radially on the outside in sections and at least indirectly above its upper ring end (14) on a lower ring edge (15) of an annular groove (16) of the housing (4) in the event of a stop, the snap ring (10) mi t an orbital ring (18) with a non-axially bored hole (17) is stacked, from which orbital ring (18) a tongue as the projection (12) radially outwards through a segment-like recess extending from an upper ring end (19) of the housing (4) (20) of the housing (4) protrudes.

Description

The invention relates to a switchable support member for a valve train of an internal combustion engine, with an insertable into a receptacle of a cylinder head of the internal combustion engine housing, in the bore an axially movable, from the housing acted upon by a spring means inner member sits, wherein in a radial bore of the inner element at least one Coupling slide extends, which in an axially extended position with a cam surface of the housing is engageable, wherein the extended position is limited by a height stop means and wherein an outer casing of the housing is surmounted by a projection for representing an external anti-rotation.

As the closest prior art, the DE 10 2008 048 926 A1 considered. In the outer casing of the housing sits a multifunctional clip. This surmounted by a sickle-like portion of the aforementioned outer sheath to represent the external rotation. The rotation is necessary to provide a directed supply of hydraulic fluid to the support element and / or to align the radial bore of the support member with the coupling piston with respect to the surrounding construction.

At the same time, above the o. G. Clip a height stop means [guarantee of coupling play] realized by contact with an annular shoulder of the inner element and an inner anti-rotation.

The clip is exposed to enormous loads during operation. In addition, the expert recognizes that the already thin-walled inner element is weakened because of the representation of the inner anti-rotation (Längsanflachungen) and loses leadership and sealing length. A simple adjustment of the axially extended position of the inner element [coupling play] is also not possible, since the clip may need to be disassembled after determining an actual game again.

Furthermore, switchable support elements are already known, the outer rotation is realized via a seated in a window of the housing pin. The latter may possibly be solved during operation. In addition, it may be deformed during assembly of the housing.

Therefore, a switchable support element is to be created in which the o. G. Disadvantages are not recorded.

According to the invention, this object is achieved in that at least one on a housing-side annular shoulder of the inner element circumferential snap ring is applied as a height stop means, which abuts radially outwardly in sections and at least indirectly via the upper annular end to a lower ring edge of an annular groove of the housing in the case of an attack, the snap ring with a Circulating ring is stacked with desachsierter bore, protruding from which circumferential ring a tongue as the projection radially outwardly through a segment-like, emanating from an upper annular end of the housing recess of the housing.

Thus, there is a support element of the type mentioned, in which the disadvantages described are no longer recorded. The at least one snap ring, possibly with voltage-reducing wave profile on the lateral surfaces, can be mounted very easily. The inner element has sufficient guidance and sealing length. At the same time, there is a simple outer anti-twist device over the revolving ring. It comes thus in comparison to the St. d. Technology for a separation of functions. Due to the desachsiert produced bore of the circulating ring, this can not rotate with respect to the support element.

The circulating ring can be designed as a simple stamped sheet metal part. In the case of an application of only one snap ring in the assembly advantageous thick-constant circumferential rings and thickness-grouped snap rings for setting the height stop [coupling play] held, in which case the respective snap ring is preferably mounted above lying.

It is advantageous to mount exactly two snap rings, which sandwich the circulating ring, in which case only the upper snap ring serves a fine adjustment of the coupling play.

About the at least one snap ring, it is also proposed in concretization of the invention, an internal rotation, so a rotation security of the inner member relative to the housing, represent. For this purpose, this snap ring on the inner edge of a bow chord-like flattening, which cooperates with a flat on the outer surface of the inner member.

When using exactly two coupling slides, a low-load force transmission is guaranteed in the coupling case. Tilts are excluded or reduced. Appropriately, an alignment of the axial line of the coupling slide takes place parallel to the cylinder head longitudinal direction or in other words in the camshaft direction.

For a more detailed explanation of the setting of the coupling game is on the older art referenced (s. DE 102 04 672 A1 , Claim 7 and description thereof).

The measures according to the invention can also be applied to roller tappets.

The invention is apparent from the drawing. Show it:

1 a longitudinal section through a switchable support element, transverse to the coupling slides;

2 a plan view of the support element with a second, upper snap ring and

3 an enlarged plan view of the support element with circulating ring.

It is drawn in 1 a switchable support element 1 for a valve train of an internal combustion engine, transverse to the two coupling slides 9 (see this DE 102 04 672 A1 ), so that these are not in their longitudinal extent within their radial bore 8th can be seen more accurately.

The support element 1 has one in a hinted here recording 2 a cylinder head 3 the internal combustion engine built, pot-like housing 4 made of sheet metal. In a hole 5 of the housing 4 runs an axially movable, out of the housing 4 out by a spring means 6 (Schraubendruckfederpakt) acted upon inner element 7 with a head 27 , The latter serves a one-end support of a rocker arm.

The coupling slide 9 lie in the radial bore 8th diametrically opposite. They are in the axially extended position of the inner element shown 7 with a driver surface of the housing 4 engaged, so that the valve lift is completed.

The extended position is via a height stop means 10 limited, which consists of two snap rings. The latter run on a housing-side ring heel 13 of the interior element 7 around, with the top of the snap rings 10 radially outside in sections over the upper annular end 14 at a lower edge of the ring 15 an annular groove 16 of the housing 4 strikes.

Between the snap rings 10 is a sandwiched ring 18 with desachsierter bore 17 recorded, so that this can not twist. From the circulation ring 18 a tongue protrudes as a projection 12 radially in one piece from the outside. The lead 12 goes through a segment-like, from an upper ring front 19 of the housing 4 outgoing recess 20 of the housing 4 , Thus, an external rotation for the support element 1 opposite the recording 2 of the cylinder head 3 created.

When mounting and coupling play adjustment is only the upper snap ring 10 grouped in thicknesses and paired.

How out 2 shows, is the upper snap ring 10 at its inner edge 21 with a flattening 22 (the lower, unrecognizable snap ring 10 also). The flattening 22 is to form an internal anti-rotation on a flat 24 an outer jacket 23 of the interior element 7 at.

Free ends 25 of the snap ring 10 are angled radially outward and run on legs 26 the recess 20 of the housing 4 ,

LIST OF REFERENCE NUMBERS

1

supporting

2

admission

3

cylinder head

4

casing

5

drilling

6

spring means

7

inner element

8th

radial bore

9

coupling slide

10

Height stop, snap ring

11

Outer jacket housing

12

Projection, tongue

13

annular shoulder

14

upper ring front

15

With ring edge

16

ring groove

17

drilling

18

circumferential ring

19

upper ring front

20

recess

21

inner edge

22

flattening

23

Outer jacket inner element

24

Flat

25

The End

26

leg

27

head

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 102008048926 A1 [0002]
• DE 10204672 A1 [0013, 0019]

Claims (5)

Switchable support element ( 1 ) for a valve train of an internal combustion engine, with a in a receptacle ( 2 ) of a cylinder head ( 3 ) of the internal combustion engine mountable housing ( 4 ), in whose bore ( 5 ) an axially movable, out of the housing ( 4 ) out by a spring means ( 6 ) acted upon inner element ( 7 ), wherein in a radial bore ( 8th ) of the inner element ( 7 ) at least one coupling slide ( 9 ), which in an axially extended position with a driver surface of the housing ( 4 ) is engageable, wherein the extended position via a height stop means ( 10 ) and wherein an outer jacket ( 11 ) of the housing ( 4 ) of a projection ( 12 ) is surmounted for representing an external anti-rotation device, characterized in that as height-stop means ( 10 ) at least one on a housing-side annular shoulder ( 13 ) of the inner element ( 7 ) circumferential snap ring is applied, which radially outside sections and at least indirectly via the upper annular end ( 14 ) at a lower ring edge ( 15 ) an annular groove ( 16 ) of the housing ( 4 ) abuts the stop case, the snap ring ( 10 ) with a circulation ring ( 18 ) with a de-centered bore ( 17 ) is stacked from which circulating ring ( 18 ) a tongue as the projection ( 12 ) radially outwardly by a segment-like, from an upper annular end ( 19 ) of the housing ( 4 ) outgoing recess ( 20 ) of the housing ( 4 ). Supporting element according to claim 1, characterized in that exactly two snap rings ( 10 ) between which the ring (between 16 ) lies. Supporting element according to claim 2, characterized in that for defining the axially extended position of the inner element ( 7 ) out of the housing ( 4 ), only the upper of the two circlips ( 10 ) is grouped at a mounting in terms of its thickness. Supporting element according to claim 1 or 2, characterized in that the snap ring ( 10 ), or, in the case of the back cover according to claim 2, at least one of the circlips ( 10 ), on its inner edge ( 21 ) a flattening ( 22 ), which with one on the outer shell ( 23 ) of the inner element ( 7 ) opposite flat ( 24 ) communicates with free ends ( 25 ) of the respective snap ring ( 10 ) angled radially outwards on legs ( 26 ) of the recess ( 20 ) of the housing ( 4 ), so that the inner anti-rotation is formed. Supporting element according to claim 1, characterized in that exactly two coupling slides ( 9 ) in the radial bore ( 8th ) of the housing ( 4 ) are diametrically opposed, wherein the support element ( 1 ) is mounted such rotationally secured, that an axial line of the radial bore ( 8th ) in the longitudinal direction of the cylinder head ( 3 ) runs.

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