DE102013220076A1 - Switchable support element - Google Patents

Abstract

Proposed is a switchable support element (1) for a valve train of an internal combustion engine, with a housable in a receptacle of a cylinder head of the internal combustion engine housing (4), in the bore (5) telescopically an inner element (6) sits, wherein the support element (1) coupling means (7) are associated, which connect the inner element (6) in an axially extended position with the housing (4), wherein the extended position is limited by a height stop means (8), wherein an outer jacket (9) of the housing (4) a projection for representing an outer anti-rotation (10) is surmounted, wherein the height stop means (8) and the outer anti-rotation device (10) are two separate components, wherein the outer jacket (9) of the housing (4) of a drehfixfixierten, bow-like ring segment than the outer rotation lock (10) for installation in a complementary counter-segment of the receptacle of the cylinder head is included, wherein a bore (12) of the ring segment is concentric with the axis of rotation of the support element (1) and wherein the ring segment (10) engages around the outer shell (9) of the housing (4) on a smooth-walled, annular groove-free section.

Description

The invention relates to a switchable support member for a valve train of an internal combustion engine, with a mountable in a receptacle of a cylinder head of the internal combustion engine housing, in the bore telescopically an inner element is seated, wherein the support element coupling means are assigned, which the inner element in an axially extended position with the housing connect, wherein the extended position 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 an annular groove of the outer shell of the housing sits a multi-functional 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, transport lock] realized by investing in 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. In addition, the annular groove for the clip in the outer casing of the housing weakens the structure and also requires manufacturing effort.

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 the height stop means and the outer anti-rotation device are two separate components, wherein the outer casing of the housing is surrounded by a rotationally fixed, bow-shaped ring segment as the outer anti-rotation device for installation in a complementary counter segment of the receptacle of the cylinder head, wherein a bore of the ring segment is concentric with the axis of rotation of the support element and wherein the ring segment surrounds the outer shell of the housing on a smooth-walled, ringnutfreien section.

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 ring with concentric bore applied to the outer casing of the housing, which can be easily mounted. It comes thus in comparison to the St. d. Technology for a separation of functions. In addition, it is found that the stiffness is increased and the manufacturing costs are minimized by the smooth-walled outer shell of the housing in the height section of the ring segment.

The ring segment according to the invention is particularly preferably held in an upper portion of the housing, so that the counter contour of the cylinder head emanates from the top only with a small depth.

The ring segment is according to a development of the invention as easy to produce, possibly also punched sheet metal stamping. Alternatively and equivalently, it is intended to form the ring of a plastic, as well as possibly perforated form. The perforation allows during transport / handling a "threading" of the ring segments, so that their entanglement is prevented. Alternatively / likewise, an assembly tool can engage in the perforation.

In addition, it is provided in an embodiment of the invention, as a height stop means to apply at least one snap ring, which is preferably thought of a snap ring package, preferably the upper ring is held variable in thickness for setting a coupling game. However, there are also other, inner stop means such as steps, pins, etc. conceivable and provided.

In order to align and hold the ring segment with respect to the support element, a twist orientation is proposed for this purpose. Accordingly, protrudes from the ring segment, a tongue radially inwardly through a recess of the housing, which tongue runs with its outer sides before legs of the recess or rests there.

The aforementioned housing recess is expediently crown-like from an upper edge of the housing and is, for example, represented by a simple cutting process.

Although it would be sufficient to fix strap ends of the ring segment "stubby" on the outer surface of the housing / snap. It is more optimal, however, if the strap ends the outer sheath slightly more than 180 °.

It is particularly advantageous if each strap end of the ring segment is flattened on the outside, so that ultimately two key surfaces lie opposite each other for a particularly good rotational fixing during installation.

The measures according to the invention can also be applied to further switchable valve train members such as roller tappets.

The invention is evident from the drawing:

1 shows a switchable supporting element in longitudinal section and

2 shows a plan view of the support after 1 ,

Shown is a switchable support 1 for a valve train of an internal combustion engine. This is in a recording, not shown, of a cylinder head of the internal combustion engine via an outer jacket 9 his sleeve-like housing 4 mountable.

In a hole 5 of the housing 4 telescopically sits an interior element 6 whose head 11 a pivotable mounting a rocker arm is used. In the interior element 6 are two trained as a piston coupling agent 7 diametrically opposite. In an axial out of the housing 4 driven position can be the inner element 6 over here with the housing 4 get connected.

The extended position is via a separate height stop means 8th limited, which here consists of two superposed and wavy snap rings. The latter sit on a ring heel 13 of the interior element 6 , The top of the circlips 8th lies over its upper ring front 14 radially outside on a lower ring edge 15 an annular groove 16 of the housing 4 at an upper edge of the case 17 in the case shown stop.

It can also be seen that an outer sheath 9 of the housing 4 from an external, separate anti-twist device 10 is surmounted, consisting of a bow-like ring segment (sheet metal stamping or plastic), which is the outer jacket 9 of the housing 4 with temple tips 23 partially overlapping by slightly more than 180 ° (sa 2 ). A hole 12 of the ring segment 10 is concentric with the axis of rotation of the support element 1 ,

2 shows that of the ring segment 10 a central tongue 18 radially inwardly through a recess 19 of the housing 4 protrudes. The tongue 18 sits with her outside 20 in front of thighs 21 the one from an upper edge 17 of the housing 4 outgoing recess 19 , This experiences the ring segment 10 a rotationally fixed alignment with respect to the housing 4 , outer jackets 24 the temple ends 23 are like key-face-like flattenings 2 shown.

The ring segment 10 runs during installation of the support element 1 in a complementary counter segment of the cylinder head shallow depth. Thus, the support element 1 aligned circumferentially (sa description introduction).

Finally revealed 2 that the ring segment 10 in the peripheral area of the tongue 18 a perforation 3 having. About this, the ring segment 10 before its assembly with a plurality of similar ring segments 10 Be transported "threaded".

LIST OF REFERENCE NUMBERS

1

supporting

2

flattening

3

perforation

4

casing

5

drilling

6

inner element

7

coupling means

8th

Height stop, snap ring

9

outer sheath

10

external anti-rotation lock, ring segment

11

head

12

drilling

13

annular shoulder

14

annular end

15

With ring edge

16

ring groove

17

upper edge

18

tongue

19

recess

20

outside

21

leg

22

not forgiven

23

Ironing end

24

outer sheath

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]

Claims (8)

Switchable support element ( 1 ) for a valve train of an internal combustion engine, with a mountable in a receptacle of a cylinder head of the internal combustion engine housing ( 4 ), in whose bore ( 5 ) telescopically an interior element ( 6 ), wherein the support element ( 1 ) Coupling agent ( 7 ) are associated, which the inner element ( 6 ) in an axially extended position with the housing ( 4 ), wherein the extended position via a height stop means ( 8th ) and wherein an outer jacket ( 9 ) of the housing ( 4 ) of a projection to represent an external rotation ( 10 ) is surmounted, characterized in that a) the height stop means ( 8th ) and the outer anti-twist device ( 10 ) are two separate components, that b) the outer sheath ( 9 ) of the housing ( 4 ) of a drehfixfixierten, bow-like ring segment as the outer anti-rotation ( 10 ) is included for installation in a complementary counter-segment of the receptacle of the cylinder head, wherein a bore ( 12 ) of the ring segment concentric to the axis of rotation of the support element ( 1 ) and that c) the ring segment ( 10 ) the outer jacket ( 9 ) of the housing ( 4 ) engages on a smooth-walled, ringnutfreien section. Support element according to claim 1, characterized in that the height-stop means ( 8th ) at least one on an annular shoulder ( 13 ) of the inner element ( 6 ) circumferential snap ring, which over its upper annular end ( 14 ) radially outward at a lower ring edge ( 15 ) an annular groove ( 16 ) of the housing ( 4 ) at its upper edge ( 17 ) abuts in the event of a stop. Supporting element according to claim 1, characterized in that for the rotationally fixed attachment of the ring segment ( 10 ) of this one in the circumferential direction seen central tongue ( 18 ) radially inwardly through a recess ( 19 ) of the housing ( 4 protrudes, which tongue ( 18 ) with their outsides ( 20 ) in front of thighs ( 21 ) from an upper edge ( 17 ) of the housing ( 4 ) outgoing recess ( 19 ) of the housing ( 4 ) sits. Supporting element according to claim 1, characterized in that the ring segment ( 10 ) with its open temple ends ( 23 ) the housing ( 4 ) by more than 180 °. Supporting element according to claim 1, characterized in that the ring segment ( 10 ) on its outer shell ( 24 ), starting from at least one of its temple ends ( 23 ), one of the arcuate shape deviating geometry is immanent. Support element according to claim 5, characterized in that as the deviating geometry a key surface-like flattening ( 2 ) is shown. Supporting element according to claim 1, characterized in that the ring segment ( 10 ) is either a Blechstanz- or a plastic part. Supporting element according to claim 1 or 7, characterized in that the ring segment ( 10 ) a perforation ( 3 ) having.

Images